From 125f8a3ddedd413a2290dae011f0bed9ffc78278 Mon Sep 17 00:00:00 2001 From: Gary Benson Date: Thu, 19 Jun 2014 14:46:38 +0100 Subject: Move shared native target specific code to gdb/nat https://sourceware.org/gdb/wiki/Common describes the following directory structure: gdb/nat/ Native target backend files. Code that interfaces with the host debug API. E.g., ptrace code, Windows debug API code, procfs code should go here. gdb/target/ Host-independent, target vector specific code (target_ops). gdb/common/ All other shared code. This commit moves all native target backend files currently in gdb/common to gdb/nat. gdb/ 2014-06-20 Gary Benson * common/gdb_thread_db.h: Moved to nat. All includes updated. * common/glibc_thread_db.h: Likewise. * common/i386-cpuid.h: Likewise. * common/i386-gcc-cpuid.h: Likewise. * common/linux-btrace.h: Likewise. * common/linux-osdata.h: Likewise. * common/linux-procfs.h: Likewise. * common/linux-ptrace.h: Likewise. * common/mips-linux-watch.h: Likewise. * common/linux-btrace.c: Moved to nat. * common/linux-osdata.c: Likewise. * common/linux-procfs.c: Likewise. * common/linux-ptrace.c: Likewise. * common/mips-linux-watch.c: Likewise. * nat/gdb_thread_db.h: Moved from common. * nat/glibc_thread_db.h: Likewise. * nat/i386-cpuid.h: Likewise. * nat/i386-gcc-cpuid.h: Likewise. * nat/linux-btrace.c: Likewise. * nat/linux-btrace.h: Likewise. * nat/linux-osdata.c: Likewise. * nat/linux-osdata.h: Likewise. * nat/linux-procfs.c: Likewise. * nat/linux-procfs.h: Likewise. * nat/linux-ptrace.c: Likewise. * nat/linux-ptrace.h: Likewise. * nat/mips-linux-watch.c: Likewise. * nat/mips-linux-watch.h: Likewise. * Makefile.in (HFILES_NO_SRCDIR): Reflect new locations. (object file files): Reordered. * gdb/copyright.py (EXCLUDE_LIST): Reflect new location of glibc_thread_db.h. gdb/gdbserver/ 2014-06-20 Gary Benson * Makefile.in (SFILES): Update locations for files moved from common to nat. (object file files): Reordered. gdb/testsuite/ 2014-06-20 Gary Benson * gdb.arch/i386-avx.exp: Fix include file location. * gdb.arch/i386-sse.exp: Likewise. --- gdb/nat/gdb_thread_db.h | 16 + gdb/nat/glibc_thread_db.h | 458 +++++++++++++ gdb/nat/i386-cpuid.h | 63 ++ gdb/nat/i386-dregs.c | 2 +- gdb/nat/i386-gcc-cpuid.h | 278 ++++++++ gdb/nat/linux-btrace.c | 634 +++++++++++++++++ gdb/nat/linux-btrace.h | 78 +++ gdb/nat/linux-osdata.c | 1634 ++++++++++++++++++++++++++++++++++++++++++++ gdb/nat/linux-osdata.h | 29 + gdb/nat/linux-procfs.c | 121 ++++ gdb/nat/linux-procfs.h | 43 ++ gdb/nat/linux-ptrace.c | 553 +++++++++++++++ gdb/nat/linux-ptrace.h | 95 +++ gdb/nat/linux-waitpid.c | 4 +- gdb/nat/mips-linux-watch.c | 349 ++++++++++ gdb/nat/mips-linux-watch.h | 126 ++++ 16 files changed, 4480 insertions(+), 3 deletions(-) create mode 100644 gdb/nat/gdb_thread_db.h create mode 100644 gdb/nat/glibc_thread_db.h create mode 100644 gdb/nat/i386-cpuid.h create mode 100644 gdb/nat/i386-gcc-cpuid.h create mode 100644 gdb/nat/linux-btrace.c create mode 100644 gdb/nat/linux-btrace.h create mode 100644 gdb/nat/linux-osdata.c create mode 100644 gdb/nat/linux-osdata.h create mode 100644 gdb/nat/linux-procfs.c create mode 100644 gdb/nat/linux-procfs.h create mode 100644 gdb/nat/linux-ptrace.c create mode 100644 gdb/nat/linux-ptrace.h create mode 100644 gdb/nat/mips-linux-watch.c create mode 100644 gdb/nat/mips-linux-watch.h (limited to 'gdb/nat') diff --git a/gdb/nat/gdb_thread_db.h b/gdb/nat/gdb_thread_db.h new file mode 100644 index 0000000..a1d9473 --- /dev/null +++ b/gdb/nat/gdb_thread_db.h @@ -0,0 +1,16 @@ +#ifdef HAVE_THREAD_DB_H +#include +#else +#include "glibc_thread_db.h" +#endif + +#ifndef LIBTHREAD_DB_SO +#define LIBTHREAD_DB_SO "libthread_db.so.1" +#endif + +#ifndef LIBTHREAD_DB_SEARCH_PATH +/* $sdir appears before $pdir for some minimal security protection: + we trust the system libthread_db.so a bit more than some random + libthread_db associated with whatever libpthread the app is using. */ +#define LIBTHREAD_DB_SEARCH_PATH "$sdir:$pdir" +#endif diff --git a/gdb/nat/glibc_thread_db.h b/gdb/nat/glibc_thread_db.h new file mode 100644 index 0000000..97423a4 --- /dev/null +++ b/gdb/nat/glibc_thread_db.h @@ -0,0 +1,458 @@ +/* thread_db.h -- interface to libthread_db.so library for debugging -lpthread + Copyright (C) 1999-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _THREAD_DB_H +#define _THREAD_DB_H 1 + +/* This is the debugger interface for the NPTL library. It is + modelled closely after the interface with same names in Solaris + with the goal to share the same code in the debugger. */ +#include +#include +#include +#include + + +/* Error codes of the library. */ +typedef enum +{ + TD_OK, /* No error. */ + TD_ERR, /* No further specified error. */ + TD_NOTHR, /* No matching thread found. */ + TD_NOSV, /* No matching synchronization handle found. */ + TD_NOLWP, /* No matching light-weighted process found. */ + TD_BADPH, /* Invalid process handle. */ + TD_BADTH, /* Invalid thread handle. */ + TD_BADSH, /* Invalid synchronization handle. */ + TD_BADTA, /* Invalid thread agent. */ + TD_BADKEY, /* Invalid key. */ + TD_NOMSG, /* No event available. */ + TD_NOFPREGS, /* No floating-point register content available. */ + TD_NOLIBTHREAD, /* Application not linked with thread library. */ + TD_NOEVENT, /* Requested event is not supported. */ + TD_NOCAPAB, /* Capability not available. */ + TD_DBERR, /* Internal debug library error. */ + TD_NOAPLIC, /* Operation is not applicable. */ + TD_NOTSD, /* No thread-specific data available. */ + TD_MALLOC, /* Out of memory. */ + TD_PARTIALREG, /* Not entire register set was read or written. */ + TD_NOXREGS, /* X register set not available for given thread. */ + TD_TLSDEFER, /* Thread has not yet allocated TLS for given module. */ + TD_NOTALLOC = TD_TLSDEFER, + TD_VERSION, /* Version if libpthread and libthread_db do not match. */ + TD_NOTLS /* There is no TLS segment in the given module. */ +} td_err_e; + + +/* Possible thread states. TD_THR_ANY_STATE is a pseudo-state used to + select threads regardless of state in td_ta_thr_iter(). */ +typedef enum +{ + TD_THR_ANY_STATE, + TD_THR_UNKNOWN, + TD_THR_STOPPED, + TD_THR_RUN, + TD_THR_ACTIVE, + TD_THR_ZOMBIE, + TD_THR_SLEEP, + TD_THR_STOPPED_ASLEEP +} td_thr_state_e; + +/* Thread type: user or system. TD_THR_ANY_TYPE is a pseudo-type used + to select threads regardless of type in td_ta_thr_iter(). */ +typedef enum +{ + TD_THR_ANY_TYPE, + TD_THR_USER, + TD_THR_SYSTEM +} td_thr_type_e; + + +/* Types of the debugging library. */ + +/* Handle for a process. This type is opaque. */ +typedef struct td_thragent td_thragent_t; + +/* The actual thread handle type. This is also opaque. */ +typedef struct td_thrhandle +{ + td_thragent_t *th_ta_p; + psaddr_t th_unique; +} td_thrhandle_t; + + +/* Forward declaration of a type defined by and for the dynamic linker. */ +struct link_map; + + +/* Flags for `td_ta_thr_iter'. */ +#define TD_THR_ANY_USER_FLAGS 0xffffffff +#define TD_THR_LOWEST_PRIORITY -20 +#define TD_SIGNO_MASK NULL + + +#define TD_EVENTSIZE 2 +#define BT_UISHIFT 5 /* log base 2 of BT_NBIPUI, to extract word index */ +#define BT_NBIPUI (1 << BT_UISHIFT) /* n bits per uint */ +#define BT_UIMASK (BT_NBIPUI - 1) /* to extract bit index */ + +/* Bitmask of enabled events. */ +typedef struct td_thr_events +{ + uint32_t event_bits[TD_EVENTSIZE]; +} td_thr_events_t; + +/* Event set manipulation macros. */ +#define __td_eventmask(n) \ + (UINT32_C (1) << (((n) - 1) & BT_UIMASK)) +#define __td_eventword(n) \ + ((UINT32_C ((n) - 1)) >> BT_UISHIFT) + +#define td_event_emptyset(setp) \ + do { \ + int __i; \ + for (__i = TD_EVENTSIZE; __i > 0; --__i) \ + (setp)->event_bits[__i - 1] = 0; \ + } while (0) + +#define td_event_fillset(setp) \ + do { \ + int __i; \ + for (__i = TD_EVENTSIZE; __i > 0; --__i) \ + (setp)->event_bits[__i - 1] = UINT32_C (0xffffffff); \ + } while (0) + +#define td_event_addset(setp, n) \ + (((setp)->event_bits[__td_eventword (n)]) |= __td_eventmask (n)) +#define td_event_delset(setp, n) \ + (((setp)->event_bits[__td_eventword (n)]) &= ~__td_eventmask (n)) +#define td_eventismember(setp, n) \ + (__td_eventmask (n) & ((setp)->event_bits[__td_eventword (n)])) +#if TD_EVENTSIZE == 2 +# define td_eventisempty(setp) \ + (!((setp)->event_bits[0]) && !((setp)->event_bits[1])) +#else +# error "td_eventisempty must be changed to match TD_EVENTSIZE" +#endif + +/* Events reportable by the thread implementation. */ +typedef enum +{ + TD_ALL_EVENTS, /* Pseudo-event number. */ + TD_EVENT_NONE = TD_ALL_EVENTS, /* Depends on context. */ + TD_READY, /* Is executable now. */ + TD_SLEEP, /* Blocked in a synchronization obj. */ + TD_SWITCHTO, /* Now assigned to a process. */ + TD_SWITCHFROM, /* Not anymore assigned to a process. */ + TD_LOCK_TRY, /* Trying to get an unavailable lock. */ + TD_CATCHSIG, /* Signal posted to the thread. */ + TD_IDLE, /* Process getting idle. */ + TD_CREATE, /* New thread created. */ + TD_DEATH, /* Thread terminated. */ + TD_PREEMPT, /* Preempted. */ + TD_PRI_INHERIT, /* Inherited elevated priority. */ + TD_REAP, /* Reaped. */ + TD_CONCURRENCY, /* Number of processes changing. */ + TD_TIMEOUT, /* Conditional variable wait timed out. */ + TD_MIN_EVENT_NUM = TD_READY, + TD_MAX_EVENT_NUM = TD_TIMEOUT, + TD_EVENTS_ENABLE = 31 /* Event reporting enabled. */ +} td_event_e; + +/* Values representing the different ways events are reported. */ +typedef enum +{ + NOTIFY_BPT, /* User must insert breakpoint at u.bptaddr. */ + NOTIFY_AUTOBPT, /* Breakpoint at u.bptaddr is automatically + inserted. */ + NOTIFY_SYSCALL /* System call u.syscallno will be invoked. */ +} td_notify_e; + +/* Description how event type is reported. */ +typedef struct td_notify +{ + td_notify_e type; /* Way the event is reported. */ + union + { + psaddr_t bptaddr; /* Address of breakpoint. */ + int syscallno; /* Number of system call used. */ + } u; +} td_notify_t; + +/* Structure used to report event. */ +typedef struct td_event_msg +{ + td_event_e event; /* Event type being reported. */ + const td_thrhandle_t *th_p; /* Thread reporting the event. */ + union + { +# if 0 + td_synchandle_t *sh; /* Handle of synchronization object. */ +#endif + uintptr_t data; /* Event specific data. */ + } msg; +} td_event_msg_t; + +/* Structure containing event data available in each thread structure. */ +typedef struct +{ + td_thr_events_t eventmask; /* Mask of enabled events. */ + td_event_e eventnum; /* Number of last event. */ + void *eventdata; /* Data associated with event. */ +} td_eventbuf_t; + + +/* Gathered statistics about the process. */ +typedef struct td_ta_stats +{ + int nthreads; /* Total number of threads in use. */ + int r_concurrency; /* Concurrency level requested by user. */ + int nrunnable_num; /* Average runnable threads, numerator. */ + int nrunnable_den; /* Average runnable threads, denominator. */ + int a_concurrency_num; /* Achieved concurrency level, numerator. */ + int a_concurrency_den; /* Achieved concurrency level, denominator. */ + int nlwps_num; /* Average number of processes in use, + numerator. */ + int nlwps_den; /* Average number of processes in use, + denominator. */ + int nidle_num; /* Average number of idling processes, + numerator. */ + int nidle_den; /* Average number of idling processes, + denominator. */ +} td_ta_stats_t; + + +/* Since Sun's library is based on Solaris threads we have to define a few + types to map them to POSIX threads. */ +typedef pthread_t thread_t; +typedef pthread_key_t thread_key_t; + + +/* Callback for iteration over threads. */ +typedef int td_thr_iter_f (const td_thrhandle_t *, void *); + +/* Callback for iteration over thread local data. */ +typedef int td_key_iter_f (thread_key_t, void (*) (void *), void *); + + + +/* Forward declaration. This has to be defined by the user. */ +struct ps_prochandle; + + +/* Information about the thread. */ +typedef struct td_thrinfo +{ + td_thragent_t *ti_ta_p; /* Process handle. */ + unsigned int ti_user_flags; /* Unused. */ + thread_t ti_tid; /* Thread ID returned by + pthread_create(). */ + char *ti_tls; /* Pointer to thread-local data. */ + psaddr_t ti_startfunc; /* Start function passed to + pthread_create(). */ + psaddr_t ti_stkbase; /* Base of thread's stack. */ + long int ti_stksize; /* Size of thread's stack. */ + psaddr_t ti_ro_area; /* Unused. */ + int ti_ro_size; /* Unused. */ + td_thr_state_e ti_state; /* Thread state. */ + unsigned char ti_db_suspended; /* Nonzero if suspended by debugger. */ + td_thr_type_e ti_type; /* Type of the thread (system vs + user thread). */ + intptr_t ti_pc; /* Unused. */ + intptr_t ti_sp; /* Unused. */ + short int ti_flags; /* Unused. */ + int ti_pri; /* Thread priority. */ + lwpid_t ti_lid; /* Kernel PID for this thread. */ + sigset_t ti_sigmask; /* Signal mask. */ + unsigned char ti_traceme; /* Nonzero if event reporting + enabled. */ + unsigned char ti_preemptflag; /* Unused. */ + unsigned char ti_pirecflag; /* Unused. */ + sigset_t ti_pending; /* Set of pending signals. */ + td_thr_events_t ti_events; /* Set of enabled events. */ +} td_thrinfo_t; + + + +/* Prototypes for exported library functions. */ + +/* Initialize the thread debug support library. */ +extern td_err_e td_init (void); + +/* Historical relict. Should not be used anymore. */ +extern td_err_e td_log (void); + +/* Return list of symbols the library can request. */ +extern const char **td_symbol_list (void); + +/* Generate new thread debug library handle for process PS. */ +extern td_err_e td_ta_new (struct ps_prochandle *__ps, td_thragent_t **__ta); + +/* Free resources allocated for TA. */ +extern td_err_e td_ta_delete (td_thragent_t *__ta); + +/* Get number of currently running threads in process associated with TA. */ +extern td_err_e td_ta_get_nthreads (const td_thragent_t *__ta, int *__np); + +/* Return process handle passed in `td_ta_new' for process associated with + TA. */ +extern td_err_e td_ta_get_ph (const td_thragent_t *__ta, + struct ps_prochandle **__ph); + +/* Map thread library handle PT to thread debug library handle for process + associated with TA and store result in *TH. */ +extern td_err_e td_ta_map_id2thr (const td_thragent_t *__ta, pthread_t __pt, + td_thrhandle_t *__th); + +/* Map process ID LWPID to thread debug library handle for process + associated with TA and store result in *TH. */ +extern td_err_e td_ta_map_lwp2thr (const td_thragent_t *__ta, lwpid_t __lwpid, + td_thrhandle_t *__th); + + +/* Call for each thread in a process associated with TA the callback function + CALLBACK. */ +extern td_err_e td_ta_thr_iter (const td_thragent_t *__ta, + td_thr_iter_f *__callback, void *__cbdata_p, + td_thr_state_e __state, int __ti_pri, + sigset_t *__ti_sigmask_p, + unsigned int __ti_user_flags); + +/* Call for each defined thread local data entry the callback function KI. */ +extern td_err_e td_ta_tsd_iter (const td_thragent_t *__ta, td_key_iter_f *__ki, + void *__p); + + +/* Get event address for EVENT. */ +extern td_err_e td_ta_event_addr (const td_thragent_t *__ta, + td_event_e __event, td_notify_t *__ptr); + +/* Enable EVENT in global mask. */ +extern td_err_e td_ta_set_event (const td_thragent_t *__ta, + td_thr_events_t *__event); + +/* Disable EVENT in global mask. */ +extern td_err_e td_ta_clear_event (const td_thragent_t *__ta, + td_thr_events_t *__event); + +/* Return information about last event. */ +extern td_err_e td_ta_event_getmsg (const td_thragent_t *__ta, + td_event_msg_t *__msg); + + +/* Set suggested concurrency level for process associated with TA. */ +extern td_err_e td_ta_setconcurrency (const td_thragent_t *__ta, int __level); + + +/* Enable collecting statistics for process associated with TA. */ +extern td_err_e td_ta_enable_stats (const td_thragent_t *__ta, int __enable); + +/* Reset statistics. */ +extern td_err_e td_ta_reset_stats (const td_thragent_t *__ta); + +/* Retrieve statistics from process associated with TA. */ +extern td_err_e td_ta_get_stats (const td_thragent_t *__ta, + td_ta_stats_t *__statsp); + + +/* Validate that TH is a thread handle. */ +extern td_err_e td_thr_validate (const td_thrhandle_t *__th); + +/* Return information about thread TH. */ +extern td_err_e td_thr_get_info (const td_thrhandle_t *__th, + td_thrinfo_t *__infop); + +/* Retrieve floating-point register contents of process running thread TH. */ +extern td_err_e td_thr_getfpregs (const td_thrhandle_t *__th, + prfpregset_t *__regset); + +/* Retrieve general register contents of process running thread TH. */ +extern td_err_e td_thr_getgregs (const td_thrhandle_t *__th, + prgregset_t __gregs); + +/* Retrieve extended register contents of process running thread TH. */ +extern td_err_e td_thr_getxregs (const td_thrhandle_t *__th, void *__xregs); + +/* Get size of extended register set of process running thread TH. */ +extern td_err_e td_thr_getxregsize (const td_thrhandle_t *__th, int *__sizep); + +/* Set floating-point register contents of process running thread TH. */ +extern td_err_e td_thr_setfpregs (const td_thrhandle_t *__th, + const prfpregset_t *__fpregs); + +/* Set general register contents of process running thread TH. */ +extern td_err_e td_thr_setgregs (const td_thrhandle_t *__th, + prgregset_t __gregs); + +/* Set extended register contents of process running thread TH. */ +extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th, + const void *__addr); + + +/* Get address of the given module's TLS storage area for the given thread. */ +extern td_err_e td_thr_tlsbase (const td_thrhandle_t *__th, + unsigned long int __modid, + psaddr_t *__base); + +/* Get address of thread local variable. */ +extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th, + psaddr_t __map_address, size_t __offset, + psaddr_t *__address); + + +/* Enable reporting for EVENT for thread TH. */ +extern td_err_e td_thr_event_enable (const td_thrhandle_t *__th, int __event); + +/* Enable EVENT for thread TH. */ +extern td_err_e td_thr_set_event (const td_thrhandle_t *__th, + td_thr_events_t *__event); + +/* Disable EVENT for thread TH. */ +extern td_err_e td_thr_clear_event (const td_thrhandle_t *__th, + td_thr_events_t *__event); + +/* Get event message for thread TH. */ +extern td_err_e td_thr_event_getmsg (const td_thrhandle_t *__th, + td_event_msg_t *__msg); + + +/* Set priority of thread TH. */ +extern td_err_e td_thr_setprio (const td_thrhandle_t *__th, int __prio); + + +/* Set pending signals for thread TH. */ +extern td_err_e td_thr_setsigpending (const td_thrhandle_t *__th, + unsigned char __n, const sigset_t *__ss); + +/* Set signal mask for thread TH. */ +extern td_err_e td_thr_sigsetmask (const td_thrhandle_t *__th, + const sigset_t *__ss); + + +/* Return thread local data associated with key TK in thread TH. */ +extern td_err_e td_thr_tsd (const td_thrhandle_t *__th, + const thread_key_t __tk, void **__data); + + +/* Suspend execution of thread TH. */ +extern td_err_e td_thr_dbsuspend (const td_thrhandle_t *__th); + +/* Resume execution of thread TH. */ +extern td_err_e td_thr_dbresume (const td_thrhandle_t *__th); + +#endif /* thread_db.h */ diff --git a/gdb/nat/i386-cpuid.h b/gdb/nat/i386-cpuid.h new file mode 100644 index 0000000..9aea054 --- /dev/null +++ b/gdb/nat/i386-cpuid.h @@ -0,0 +1,63 @@ +/* C API for x86 cpuid insn. + Copyright (C) 2007-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This file is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 3, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef I386_CPUID_COMMON_H +#define I386_CPUID_COMMON_H + +/* Always include the header for the cpu bit defines. */ +#include "i386-gcc-cpuid.h" + +#if defined(__i386__) || defined(__x86_64__) + +/* Return cpuid data for requested cpuid level, as found in returned + eax, ebx, ecx and edx registers. The function checks if cpuid is + supported and returns 1 for valid cpuid information or 0 for + unsupported cpuid level. Pointers may be non-null. */ + +static __inline int +i386_cpuid (unsigned int __level, + unsigned int *__eax, unsigned int *__ebx, + unsigned int *__ecx, unsigned int *__edx) +{ + unsigned int __scratch; + + if (!__eax) + __eax = &__scratch; + if (!__ebx) + __ebx = &__scratch; + if (!__ecx) + __ecx = &__scratch; + if (!__edx) + __edx = &__scratch; + + return __get_cpuid (__level, __eax, __ebx, __ecx, __edx); +} + +#else + +static __inline int +i386_cpuid (unsigned int __level, + unsigned int *__eax, unsigned int *__ebx, + unsigned int *__ecx, unsigned int *__edx) +{ + return 0; +} + +#endif /* i386 && x86_64 */ + +#endif /* I386_CPUID_COMMON_H */ diff --git a/gdb/nat/i386-dregs.c b/gdb/nat/i386-dregs.c index e7d1620..214616c 100644 --- a/gdb/nat/i386-dregs.c +++ b/gdb/nat/i386-dregs.c @@ -23,7 +23,7 @@ #include "defs.h" #include "inferior.h" #endif -#include "nat/i386-dregs.h" +#include "i386-dregs.h" /* Support for hardware watchpoints and breakpoints using the i386 debug registers. diff --git a/gdb/nat/i386-gcc-cpuid.h b/gdb/nat/i386-gcc-cpuid.h new file mode 100644 index 0000000..34ab197 --- /dev/null +++ b/gdb/nat/i386-gcc-cpuid.h @@ -0,0 +1,278 @@ +/* + * Helper cpuid.h file copied from gcc-4.8.0. Code in gdb should not + * include this directly, but pull in i386-cpuid.h and use that func. + */ +/* + * Copyright (C) 2007-2014 Free Software Foundation, Inc. + * + * This file is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 3, or (at your option) any + * later version. + * + * This file is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * Under Section 7 of GPL version 3, you are granted additional + * permissions described in the GCC Runtime Library Exception, version + * 3.1, as published by the Free Software Foundation. + * + * You should have received a copy of the GNU General Public License and + * a copy of the GCC Runtime Library Exception along with this program; + * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + * . + */ + +/* %ecx */ +#define bit_SSE3 (1 << 0) +#define bit_PCLMUL (1 << 1) +#define bit_LZCNT (1 << 5) +#define bit_SSSE3 (1 << 9) +#define bit_FMA (1 << 12) +#define bit_CMPXCHG16B (1 << 13) +#define bit_SSE4_1 (1 << 19) +#define bit_SSE4_2 (1 << 20) +#define bit_MOVBE (1 << 22) +#define bit_POPCNT (1 << 23) +#define bit_AES (1 << 25) +#define bit_XSAVE (1 << 26) +#define bit_OSXSAVE (1 << 27) +#define bit_AVX (1 << 28) +#define bit_F16C (1 << 29) +#define bit_RDRND (1 << 30) + +/* %edx */ +#define bit_CMPXCHG8B (1 << 8) +#define bit_CMOV (1 << 15) +#define bit_MMX (1 << 23) +#define bit_FXSAVE (1 << 24) +#define bit_SSE (1 << 25) +#define bit_SSE2 (1 << 26) + +/* Extended Features */ +/* %ecx */ +#define bit_LAHF_LM (1 << 0) +#define bit_ABM (1 << 5) +#define bit_SSE4a (1 << 6) +#define bit_PRFCHW (1 << 8) +#define bit_XOP (1 << 11) +#define bit_LWP (1 << 15) +#define bit_FMA4 (1 << 16) +#define bit_TBM (1 << 21) + +/* %edx */ +#define bit_MMXEXT (1 << 22) +#define bit_LM (1 << 29) +#define bit_3DNOWP (1 << 30) +#define bit_3DNOW (1 << 31) + +/* Extended Features (%eax == 7) */ +#define bit_FSGSBASE (1 << 0) +#define bit_BMI (1 << 3) +#define bit_HLE (1 << 4) +#define bit_AVX2 (1 << 5) +#define bit_BMI2 (1 << 8) +#define bit_RTM (1 << 11) +#define bit_AVX512F (1 << 16) +#define bit_MPX (1 << 14) +#define bit_RDSEED (1 << 18) +#define bit_ADX (1 << 19) +#define bit_AVX512PF (1 << 26) +#define bit_AVX512ER (1 << 27) +#define bit_AVX512CD (1 << 28) +#define bit_SHA (1 << 29) + +/* Extended State Enumeration Sub-leaf (%eax == 13, %ecx == 1) */ +#define bit_XSAVEOPT (1 << 0) + +/* Signatures for different CPU implementations as returned in uses + of cpuid with level 0. */ +#define signature_AMD_ebx 0x68747541 +#define signature_AMD_ecx 0x444d4163 +#define signature_AMD_edx 0x69746e65 + +#define signature_CENTAUR_ebx 0x746e6543 +#define signature_CENTAUR_ecx 0x736c7561 +#define signature_CENTAUR_edx 0x48727561 + +#define signature_CYRIX_ebx 0x69727943 +#define signature_CYRIX_ecx 0x64616574 +#define signature_CYRIX_edx 0x736e4978 + +#define signature_INTEL_ebx 0x756e6547 +#define signature_INTEL_ecx 0x6c65746e +#define signature_INTEL_edx 0x49656e69 + +#define signature_TM1_ebx 0x6e617254 +#define signature_TM1_ecx 0x55504361 +#define signature_TM1_edx 0x74656d73 + +#define signature_TM2_ebx 0x756e6547 +#define signature_TM2_ecx 0x3638784d +#define signature_TM2_edx 0x54656e69 + +#define signature_NSC_ebx 0x646f6547 +#define signature_NSC_ecx 0x43534e20 +#define signature_NSC_edx 0x79622065 + +#define signature_NEXGEN_ebx 0x4778654e +#define signature_NEXGEN_ecx 0x6e657669 +#define signature_NEXGEN_edx 0x72446e65 + +#define signature_RISE_ebx 0x65736952 +#define signature_RISE_ecx 0x65736952 +#define signature_RISE_edx 0x65736952 + +#define signature_SIS_ebx 0x20536953 +#define signature_SIS_ecx 0x20536953 +#define signature_SIS_edx 0x20536953 + +#define signature_UMC_ebx 0x20434d55 +#define signature_UMC_ecx 0x20434d55 +#define signature_UMC_edx 0x20434d55 + +#define signature_VIA_ebx 0x20414956 +#define signature_VIA_ecx 0x20414956 +#define signature_VIA_edx 0x20414956 + +#define signature_VORTEX_ebx 0x74726f56 +#define signature_VORTEX_ecx 0x436f5320 +#define signature_VORTEX_edx 0x36387865 + +#if defined(__i386__) && defined(__PIC__) +/* %ebx may be the PIC register. */ +#if __GNUC__ >= 3 +#define __cpuid(level, a, b, c, d) \ + __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t" \ + "cpuid\n\t" \ + "xchg{l}\t{%%}ebx, %k1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level)) + +#define __cpuid_count(level, count, a, b, c, d) \ + __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t" \ + "cpuid\n\t" \ + "xchg{l}\t{%%}ebx, %k1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level), "2" (count)) +#else +/* Host GCCs older than 3.0 weren't supporting Intel asm syntax + nor alternatives in i386 code. */ +#define __cpuid(level, a, b, c, d) \ + __asm__ ("xchgl\t%%ebx, %k1\n\t" \ + "cpuid\n\t" \ + "xchgl\t%%ebx, %k1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level)) + +#define __cpuid_count(level, count, a, b, c, d) \ + __asm__ ("xchgl\t%%ebx, %k1\n\t" \ + "cpuid\n\t" \ + "xchgl\t%%ebx, %k1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level), "2" (count)) +#endif +#elif defined(__x86_64__) && (defined(__code_model_medium__) || defined(__code_model_large__)) && defined(__PIC__) +/* %rbx may be the PIC register. */ +#define __cpuid(level, a, b, c, d) \ + __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ + "cpuid\n\t" \ + "xchg{q}\t{%%}rbx, %q1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level)) + +#define __cpuid_count(level, count, a, b, c, d) \ + __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t" \ + "cpuid\n\t" \ + "xchg{q}\t{%%}rbx, %q1\n\t" \ + : "=a" (a), "=&r" (b), "=c" (c), "=d" (d) \ + : "0" (level), "2" (count)) +#else +#define __cpuid(level, a, b, c, d) \ + __asm__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level)) + +#define __cpuid_count(level, count, a, b, c, d) \ + __asm__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level), "2" (count)) +#endif + +/* Return highest supported input value for cpuid instruction. ext can + be either 0x0 or 0x8000000 to return highest supported value for + basic or extended cpuid information. Function returns 0 if cpuid + is not supported or whatever cpuid returns in eax register. If sig + pointer is non-null, then first four bytes of the signature + (as found in ebx register) are returned in location pointed by sig. */ + +static __inline unsigned int +__get_cpuid_max (unsigned int __ext, unsigned int *__sig) +{ + unsigned int __eax, __ebx, __ecx, __edx; + +#ifndef __x86_64__ + /* See if we can use cpuid. On AMD64 we always can. */ +#if __GNUC__ >= 3 + __asm__ ("pushf{l|d}\n\t" + "pushf{l|d}\n\t" + "pop{l}\t%0\n\t" + "mov{l}\t{%0, %1|%1, %0}\n\t" + "xor{l}\t{%2, %0|%0, %2}\n\t" + "push{l}\t%0\n\t" + "popf{l|d}\n\t" + "pushf{l|d}\n\t" + "pop{l}\t%0\n\t" + "popf{l|d}\n\t" + : "=&r" (__eax), "=&r" (__ebx) + : "i" (0x00200000)); +#else +/* Host GCCs older than 3.0 weren't supporting Intel asm syntax + nor alternatives in i386 code. */ + __asm__ ("pushfl\n\t" + "pushfl\n\t" + "popl\t%0\n\t" + "movl\t%0, %1\n\t" + "xorl\t%2, %0\n\t" + "pushl\t%0\n\t" + "popfl\n\t" + "pushfl\n\t" + "popl\t%0\n\t" + "popfl\n\t" + : "=&r" (__eax), "=&r" (__ebx) + : "i" (0x00200000)); +#endif + + if (!((__eax ^ __ebx) & 0x00200000)) + return 0; +#endif + + /* Host supports cpuid. Return highest supported cpuid input value. */ + __cpuid (__ext, __eax, __ebx, __ecx, __edx); + + if (__sig) + *__sig = __ebx; + + return __eax; +} + +/* Return cpuid data for requested cpuid level, as found in returned + eax, ebx, ecx and edx registers. The function checks if cpuid is + supported and returns 1 for valid cpuid information or 0 for + unsupported cpuid level. All pointers are required to be non-null. */ + +static __inline int +__get_cpuid (unsigned int __level, + unsigned int *__eax, unsigned int *__ebx, + unsigned int *__ecx, unsigned int *__edx) +{ + unsigned int __ext = __level & 0x80000000; + + if (__get_cpuid_max (__ext, 0) < __level) + return 0; + + __cpuid (__level, *__eax, *__ebx, *__ecx, *__edx); + return 1; +} diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c new file mode 100644 index 0000000..188220b --- /dev/null +++ b/gdb/nat/linux-btrace.c @@ -0,0 +1,634 @@ +/* Linux-dependent part of branch trace support for GDB, and GDBserver. + + Copyright (C) 2013-2014 Free Software Foundation, Inc. + + Contributed by Intel Corp. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#endif + +#include "linux-btrace.h" +#include "common-utils.h" +#include "gdb_assert.h" +#include "regcache.h" +#include "gdbthread.h" +#include "gdb_wait.h" +#include "i386-cpuid.h" + +#ifdef HAVE_SYS_SYSCALL_H +#include +#endif + +#if HAVE_LINUX_PERF_EVENT_H && defined(SYS_perf_event_open) + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* A branch trace record in perf_event. */ +struct perf_event_bts +{ + /* The linear address of the branch source. */ + uint64_t from; + + /* The linear address of the branch destination. */ + uint64_t to; +}; + +/* A perf_event branch trace sample. */ +struct perf_event_sample +{ + /* The perf_event sample header. */ + struct perf_event_header header; + + /* The perf_event branch tracing payload. */ + struct perf_event_bts bts; +}; + +/* Get the perf_event header. */ + +static inline volatile struct perf_event_mmap_page * +perf_event_header (struct btrace_target_info* tinfo) +{ + return tinfo->buffer; +} + +/* Get the size of the perf_event mmap buffer. */ + +static inline size_t +perf_event_mmap_size (const struct btrace_target_info *tinfo) +{ + /* The branch trace buffer is preceded by a configuration page. */ + return (tinfo->size + 1) * PAGE_SIZE; +} + +/* Get the size of the perf_event buffer. */ + +static inline size_t +perf_event_buffer_size (struct btrace_target_info* tinfo) +{ + return tinfo->size * PAGE_SIZE; +} + +/* Get the start address of the perf_event buffer. */ + +static inline const uint8_t * +perf_event_buffer_begin (struct btrace_target_info* tinfo) +{ + return ((const uint8_t *) tinfo->buffer) + PAGE_SIZE; +} + +/* Get the end address of the perf_event buffer. */ + +static inline const uint8_t * +perf_event_buffer_end (struct btrace_target_info* tinfo) +{ + return perf_event_buffer_begin (tinfo) + perf_event_buffer_size (tinfo); +} + +/* Check whether an address is in the kernel. */ + +static inline int +perf_event_is_kernel_addr (const struct btrace_target_info *tinfo, + uint64_t addr) +{ + uint64_t mask; + + /* If we don't know the size of a pointer, we can't check. Let's assume it's + not a kernel address in this case. */ + if (tinfo->ptr_bits == 0) + return 0; + + /* A bit mask for the most significant bit in an address. */ + mask = (uint64_t) 1 << (tinfo->ptr_bits - 1); + + /* Check whether the most significant bit in the address is set. */ + return (addr & mask) != 0; +} + +/* Check whether a perf event record should be skipped. */ + +static inline int +perf_event_skip_record (const struct btrace_target_info *tinfo, + const struct perf_event_bts *bts) +{ + /* The hardware may report branches from kernel into user space. Branches + from user into kernel space will be suppressed. We filter the former to + provide a consistent branch trace excluding kernel. */ + return perf_event_is_kernel_addr (tinfo, bts->from); +} + +/* Perform a few consistency checks on a perf event sample record. This is + meant to catch cases when we get out of sync with the perf event stream. */ + +static inline int +perf_event_sample_ok (const struct perf_event_sample *sample) +{ + if (sample->header.type != PERF_RECORD_SAMPLE) + return 0; + + if (sample->header.size != sizeof (*sample)) + return 0; + + return 1; +} + +/* Branch trace is collected in a circular buffer [begin; end) as pairs of from + and to addresses (plus a header). + + Start points into that buffer at the next sample position. + We read the collected samples backwards from start. + + While reading the samples, we convert the information into a list of blocks. + For two adjacent samples s1 and s2, we form a block b such that b.begin = + s1.to and b.end = s2.from. + + In case the buffer overflows during sampling, one sample may have its lower + part at the end and its upper part at the beginning of the buffer. */ + +static VEC (btrace_block_s) * +perf_event_read_bts (struct btrace_target_info* tinfo, const uint8_t *begin, + const uint8_t *end, const uint8_t *start, size_t size) +{ + VEC (btrace_block_s) *btrace = NULL; + struct perf_event_sample sample; + size_t read = 0; + struct btrace_block block = { 0, 0 }; + struct regcache *regcache; + + gdb_assert (begin <= start); + gdb_assert (start <= end); + + /* The first block ends at the current pc. */ +#ifdef GDBSERVER + regcache = get_thread_regcache (find_thread_ptid (tinfo->ptid), 1); +#else + regcache = get_thread_regcache (tinfo->ptid); +#endif + block.end = regcache_read_pc (regcache); + + /* The buffer may contain a partial record as its last entry (i.e. when the + buffer size is not a multiple of the sample size). */ + read = sizeof (sample) - 1; + + for (; read < size; read += sizeof (sample)) + { + const struct perf_event_sample *psample; + + /* Find the next perf_event sample in a backwards traversal. */ + start -= sizeof (sample); + + /* If we're still inside the buffer, we're done. */ + if (begin <= start) + psample = (const struct perf_event_sample *) start; + else + { + int missing; + + /* We're to the left of the ring buffer, we will wrap around and + reappear at the very right of the ring buffer. */ + + missing = (begin - start); + start = (end - missing); + + /* If the entire sample is missing, we're done. */ + if (missing == sizeof (sample)) + psample = (const struct perf_event_sample *) start; + else + { + uint8_t *stack; + + /* The sample wrapped around. The lower part is at the end and + the upper part is at the beginning of the buffer. */ + stack = (uint8_t *) &sample; + + /* Copy the two parts so we have a contiguous sample. */ + memcpy (stack, start, missing); + memcpy (stack + missing, begin, sizeof (sample) - missing); + + psample = &sample; + } + } + + if (!perf_event_sample_ok (psample)) + { + warning (_("Branch trace may be incomplete.")); + break; + } + + if (perf_event_skip_record (tinfo, &psample->bts)) + continue; + + /* We found a valid sample, so we can complete the current block. */ + block.begin = psample->bts.to; + + VEC_safe_push (btrace_block_s, btrace, &block); + + /* Start the next block. */ + block.end = psample->bts.from; + } + + /* Push the last block (i.e. the first one of inferior execution), as well. + We don't know where it ends, but we know where it starts. If we're + reading delta trace, we can fill in the start address later on. + Otherwise we will prune it. */ + block.begin = 0; + VEC_safe_push (btrace_block_s, btrace, &block); + + return btrace; +} + +/* Check whether the kernel supports branch tracing. */ + +static int +kernel_supports_btrace (void) +{ + struct perf_event_attr attr; + pid_t child, pid; + int status, file; + + errno = 0; + child = fork (); + switch (child) + { + case -1: + warning (_("test branch tracing: cannot fork: %s."), strerror (errno)); + return 0; + + case 0: + status = ptrace (PTRACE_TRACEME, 0, NULL, NULL); + if (status != 0) + { + warning (_("test branch tracing: cannot PTRACE_TRACEME: %s."), + strerror (errno)); + _exit (1); + } + + status = raise (SIGTRAP); + if (status != 0) + { + warning (_("test branch tracing: cannot raise SIGTRAP: %s."), + strerror (errno)); + _exit (1); + } + + _exit (1); + + default: + pid = waitpid (child, &status, 0); + if (pid != child) + { + warning (_("test branch tracing: bad pid %ld, error: %s."), + (long) pid, strerror (errno)); + return 0; + } + + if (!WIFSTOPPED (status)) + { + warning (_("test branch tracing: expected stop. status: %d."), + status); + return 0; + } + + memset (&attr, 0, sizeof (attr)); + + attr.type = PERF_TYPE_HARDWARE; + attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; + attr.sample_period = 1; + attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR; + attr.exclude_kernel = 1; + attr.exclude_hv = 1; + attr.exclude_idle = 1; + + file = syscall (SYS_perf_event_open, &attr, child, -1, -1, 0); + if (file >= 0) + close (file); + + kill (child, SIGKILL); + ptrace (PTRACE_KILL, child, NULL, NULL); + + pid = waitpid (child, &status, 0); + if (pid != child) + { + warning (_("test branch tracing: bad pid %ld, error: %s."), + (long) pid, strerror (errno)); + if (!WIFSIGNALED (status)) + warning (_("test branch tracing: expected killed. status: %d."), + status); + } + + return (file >= 0); + } +} + +/* Check whether an Intel cpu supports branch tracing. */ + +static int +intel_supports_btrace (void) +{ + unsigned int cpuid, model, family; + + if (!i386_cpuid (1, &cpuid, NULL, NULL, NULL)) + return 0; + + family = (cpuid >> 8) & 0xf; + model = (cpuid >> 4) & 0xf; + + switch (family) + { + case 0x6: + model += (cpuid >> 12) & 0xf0; + + switch (model) + { + case 0x1a: /* Nehalem */ + case 0x1f: + case 0x1e: + case 0x2e: + case 0x25: /* Westmere */ + case 0x2c: + case 0x2f: + case 0x2a: /* Sandy Bridge */ + case 0x2d: + case 0x3a: /* Ivy Bridge */ + + /* AAJ122: LBR, BTM, or BTS records may have incorrect branch + "from" information afer an EIST transition, T-states, C1E, or + Adaptive Thermal Throttling. */ + return 0; + } + } + + return 1; +} + +/* Check whether the cpu supports branch tracing. */ + +static int +cpu_supports_btrace (void) +{ + unsigned int ebx, ecx, edx; + + if (!i386_cpuid (0, NULL, &ebx, &ecx, &edx)) + return 0; + + if (ebx == signature_INTEL_ebx && ecx == signature_INTEL_ecx + && edx == signature_INTEL_edx) + return intel_supports_btrace (); + + /* Don't know about others. Let's assume they do. */ + return 1; +} + +/* See linux-btrace.h. */ + +int +linux_supports_btrace (struct target_ops *ops) +{ + static int cached; + + if (cached == 0) + { + if (!kernel_supports_btrace ()) + cached = -1; + else if (!cpu_supports_btrace ()) + cached = -1; + else + cached = 1; + } + + return cached > 0; +} + +/* See linux-btrace.h. */ + +struct btrace_target_info * +linux_enable_btrace (ptid_t ptid) +{ + struct btrace_target_info *tinfo; + int pid, pg; + + tinfo = xzalloc (sizeof (*tinfo)); + tinfo->ptid = ptid; + + tinfo->attr.size = sizeof (tinfo->attr); + tinfo->attr.type = PERF_TYPE_HARDWARE; + tinfo->attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; + tinfo->attr.sample_period = 1; + + /* We sample from and to address. */ + tinfo->attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR; + + tinfo->attr.exclude_kernel = 1; + tinfo->attr.exclude_hv = 1; + tinfo->attr.exclude_idle = 1; + + tinfo->ptr_bits = 0; + + pid = ptid_get_lwp (ptid); + if (pid == 0) + pid = ptid_get_pid (ptid); + + errno = 0; + tinfo->file = syscall (SYS_perf_event_open, &tinfo->attr, pid, -1, -1, 0); + if (tinfo->file < 0) + goto err; + + /* We try to allocate as much buffer as we can get. + We could allow the user to specify the size of the buffer, but then + we'd leave this search for the maximum buffer size to him. */ + for (pg = 4; pg >= 0; --pg) + { + /* The number of pages we request needs to be a power of two. */ + tinfo->size = 1 << pg; + tinfo->buffer = mmap (NULL, perf_event_mmap_size (tinfo), + PROT_READ, MAP_SHARED, tinfo->file, 0); + if (tinfo->buffer == MAP_FAILED) + continue; + + return tinfo; + } + + /* We were not able to allocate any buffer. */ + close (tinfo->file); + + err: + xfree (tinfo); + return NULL; +} + +/* See linux-btrace.h. */ + +enum btrace_error +linux_disable_btrace (struct btrace_target_info *tinfo) +{ + int errcode; + + errno = 0; + errcode = munmap (tinfo->buffer, perf_event_mmap_size (tinfo)); + if (errcode != 0) + return BTRACE_ERR_UNKNOWN; + + close (tinfo->file); + xfree (tinfo); + + return BTRACE_ERR_NONE; +} + +/* Check whether the branch trace has changed. */ + +static int +linux_btrace_has_changed (struct btrace_target_info *tinfo) +{ + volatile struct perf_event_mmap_page *header = perf_event_header (tinfo); + + return header->data_head != tinfo->data_head; +} + +/* See linux-btrace.h. */ + +enum btrace_error +linux_read_btrace (VEC (btrace_block_s) **btrace, + struct btrace_target_info *tinfo, + enum btrace_read_type type) +{ + volatile struct perf_event_mmap_page *header; + const uint8_t *begin, *end, *start; + unsigned long data_head, data_tail, retries = 5; + size_t buffer_size, size; + + /* For delta reads, we return at least the partial last block containing + the current PC. */ + if (type == BTRACE_READ_NEW && !linux_btrace_has_changed (tinfo)) + return BTRACE_ERR_NONE; + + header = perf_event_header (tinfo); + buffer_size = perf_event_buffer_size (tinfo); + data_tail = tinfo->data_head; + + /* We may need to retry reading the trace. See below. */ + while (retries--) + { + data_head = header->data_head; + + /* Delete any leftover trace from the previous iteration. */ + VEC_free (btrace_block_s, *btrace); + + if (type == BTRACE_READ_DELTA) + { + /* Determine the number of bytes to read and check for buffer + overflows. */ + + /* Check for data head overflows. We might be able to recover from + those but they are very unlikely and it's not really worth the + effort, I think. */ + if (data_head < data_tail) + return BTRACE_ERR_OVERFLOW; + + /* If the buffer is smaller than the trace delta, we overflowed. */ + size = data_head - data_tail; + if (buffer_size < size) + return BTRACE_ERR_OVERFLOW; + } + else + { + /* Read the entire buffer. */ + size = buffer_size; + + /* Adjust the size if the buffer has not overflowed, yet. */ + if (data_head < size) + size = data_head; + } + + /* Data_head keeps growing; the buffer itself is circular. */ + begin = perf_event_buffer_begin (tinfo); + start = begin + data_head % buffer_size; + + if (data_head <= buffer_size) + end = start; + else + end = perf_event_buffer_end (tinfo); + + *btrace = perf_event_read_bts (tinfo, begin, end, start, size); + + /* The stopping thread notifies its ptracer before it is scheduled out. + On multi-core systems, the debugger might therefore run while the + kernel might be writing the last branch trace records. + + Let's check whether the data head moved while we read the trace. */ + if (data_head == header->data_head) + break; + } + + tinfo->data_head = data_head; + + /* Prune the incomplete last block (i.e. the first one of inferior execution) + if we're not doing a delta read. There is no way of filling in its zeroed + BEGIN element. */ + if (!VEC_empty (btrace_block_s, *btrace) && type != BTRACE_READ_DELTA) + VEC_pop (btrace_block_s, *btrace); + + return BTRACE_ERR_NONE; +} + +#else /* !HAVE_LINUX_PERF_EVENT_H */ + +/* See linux-btrace.h. */ + +int +linux_supports_btrace (struct target_ops *ops) +{ + return 0; +} + +/* See linux-btrace.h. */ + +struct btrace_target_info * +linux_enable_btrace (ptid_t ptid) +{ + return NULL; +} + +/* See linux-btrace.h. */ + +enum btrace_error +linux_disable_btrace (struct btrace_target_info *tinfo) +{ + return BTRACE_ERR_NOT_SUPPORTED; +} + +/* See linux-btrace.h. */ + +enum btrace_error +linux_read_btrace (VEC (btrace_block_s) **btrace, + struct btrace_target_info *tinfo, + enum btrace_read_type type) +{ + return BTRACE_ERR_NOT_SUPPORTED; +} + +#endif /* !HAVE_LINUX_PERF_EVENT_H */ diff --git a/gdb/nat/linux-btrace.h b/gdb/nat/linux-btrace.h new file mode 100644 index 0000000..12e9b60 --- /dev/null +++ b/gdb/nat/linux-btrace.h @@ -0,0 +1,78 @@ +/* Linux-dependent part of branch trace support for GDB, and GDBserver. + + Copyright (C) 2013-2014 Free Software Foundation, Inc. + + Contributed by Intel Corp. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef LINUX_BTRACE_H +#define LINUX_BTRACE_H + +#include "btrace-common.h" +#include "config.h" +#include "vec.h" +#include "ptid.h" +#include +#include + +#if HAVE_LINUX_PERF_EVENT_H +# include +#endif + +/* Branch trace target information per thread. */ +struct btrace_target_info +{ +#if HAVE_LINUX_PERF_EVENT_H + /* The Linux perf_event configuration for collecting the branch trace. */ + struct perf_event_attr attr; + + /* The ptid of this thread. */ + ptid_t ptid; + + /* The mmap configuration mapping the branch trace perf_event buffer. + + file .. the file descriptor + buffer .. the mmapped memory buffer + size .. the buffer's size in pages without the configuration page + data_head .. the data head from the last read */ + int file; + void *buffer; + size_t size; + unsigned long data_head; +#endif /* HAVE_LINUX_PERF_EVENT_H */ + + /* The size of a pointer in bits for this thread. + The information is used to identify kernel addresses in order to skip + records from/to kernel space. */ + int ptr_bits; +}; + +/* See to_supports_btrace in target.h. */ +extern int linux_supports_btrace (struct target_ops *); + +/* See to_enable_btrace in target.h. */ +extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid); + +/* See to_disable_btrace in target.h. */ +extern enum btrace_error linux_disable_btrace (struct btrace_target_info *ti); + +/* See to_read_btrace in target.h. */ +extern enum btrace_error linux_read_btrace (VEC (btrace_block_s) **btrace, + struct btrace_target_info *btinfo, + enum btrace_read_type type); + +#endif /* LINUX_BTRACE_H */ diff --git a/gdb/nat/linux-osdata.c b/gdb/nat/linux-osdata.c new file mode 100644 index 0000000..dae637b --- /dev/null +++ b/gdb/nat/linux-osdata.c @@ -0,0 +1,1634 @@ +/* Linux-specific functions to retrieve OS data. + + Copyright (C) 2009-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#endif + +#include "linux-osdata.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xml-utils.h" +#include "buffer.h" +#include "gdb_assert.h" +#include +#include +#include "filestuff.h" + +#define NAMELEN(dirent) strlen ((dirent)->d_name) + +/* Define PID_T to be a fixed size that is at least as large as pid_t, + so that reading pid values embedded in /proc works + consistently. */ + +typedef long long PID_T; + +/* Define TIME_T to be at least as large as time_t, so that reading + time values embedded in /proc works consistently. */ + +typedef long long TIME_T; + +#define MAX_PID_T_STRLEN (sizeof ("-9223372036854775808") - 1) + +/* Returns the CPU core that thread PTID is currently running on. */ + +/* Compute and return the processor core of a given thread. */ + +int +linux_common_core_of_thread (ptid_t ptid) +{ + char filename[sizeof ("/proc//task//stat") + 2 * MAX_PID_T_STRLEN]; + FILE *f; + char *content = NULL; + char *p; + char *ts = 0; + int content_read = 0; + int i; + int core; + + sprintf (filename, "/proc/%lld/task/%lld/stat", + (PID_T) ptid_get_pid (ptid), (PID_T) ptid_get_lwp (ptid)); + f = gdb_fopen_cloexec (filename, "r"); + if (!f) + return -1; + + for (;;) + { + int n; + content = xrealloc (content, content_read + 1024); + n = fread (content + content_read, 1, 1024, f); + content_read += n; + if (n < 1024) + { + content[content_read] = '\0'; + break; + } + } + + /* ps command also relies on no trailing fields ever contain ')'. */ + p = strrchr (content, ')'); + if (p != NULL) + p++; + + /* If the first field after program name has index 0, then core number is + the field with index 36. There's no constant for that anywhere. */ + if (p != NULL) + p = strtok_r (p, " ", &ts); + for (i = 0; p != NULL && i != 36; ++i) + p = strtok_r (NULL, " ", &ts); + + if (p == NULL || sscanf (p, "%d", &core) == 0) + core = -1; + + xfree (content); + fclose (f); + + return core; +} + +/* Finds the command-line of process PID and copies it into COMMAND. + At most MAXLEN characters are copied. If the command-line cannot + be found, PID is copied into command in text-form. */ + +static void +command_from_pid (char *command, int maxlen, PID_T pid) +{ + char *stat_path = xstrprintf ("/proc/%lld/stat", pid); + FILE *fp = gdb_fopen_cloexec (stat_path, "r"); + + command[0] = '\0'; + + if (fp) + { + /* sizeof (cmd) should be greater or equal to TASK_COMM_LEN (in + include/linux/sched.h in the Linux kernel sources) plus two + (for the brackets). */ + char cmd[18]; + PID_T stat_pid; + int items_read = fscanf (fp, "%lld %17s", &stat_pid, cmd); + + if (items_read == 2 && pid == stat_pid) + { + cmd[strlen (cmd) - 1] = '\0'; /* Remove trailing parenthesis. */ + strncpy (command, cmd + 1, maxlen); /* Ignore leading parenthesis. */ + } + + fclose (fp); + } + else + { + /* Return the PID if a /proc entry for the process cannot be found. */ + snprintf (command, maxlen, "%lld", pid); + } + + command[maxlen - 1] = '\0'; /* Ensure string is null-terminated. */ + + xfree (stat_path); +} + +/* Returns the command-line of the process with the given PID. The + returned string needs to be freed using xfree after use. */ + +static char * +commandline_from_pid (PID_T pid) +{ + char *pathname = xstrprintf ("/proc/%lld/cmdline", pid); + char *commandline = NULL; + FILE *f = gdb_fopen_cloexec (pathname, "r"); + + if (f) + { + size_t len = 0; + + while (!feof (f)) + { + char buf[1024]; + size_t read_bytes = fread (buf, 1, sizeof (buf), f); + + if (read_bytes) + { + commandline = (char *) xrealloc (commandline, len + read_bytes + 1); + memcpy (commandline + len, buf, read_bytes); + len += read_bytes; + } + } + + fclose (f); + + if (commandline) + { + size_t i; + + /* Replace null characters with spaces. */ + for (i = 0; i < len; ++i) + if (commandline[i] == '\0') + commandline[i] = ' '; + + commandline[len] = '\0'; + } + else + { + /* Return the command in square brackets if the command-line + is empty. */ + commandline = (char *) xmalloc (32); + commandline[0] = '['; + command_from_pid (commandline + 1, 31, pid); + + len = strlen (commandline); + if (len < 31) + strcat (commandline, "]"); + } + } + + xfree (pathname); + + return commandline; +} + +/* Finds the user name for the user UID and copies it into USER. At + most MAXLEN characters are copied. */ + +static void +user_from_uid (char *user, int maxlen, uid_t uid) +{ + struct passwd *pwentry = getpwuid (uid); + + if (pwentry) + { + strncpy (user, pwentry->pw_name, maxlen); + /* Ensure that the user name is null-terminated. */ + user[maxlen - 1] = '\0'; + } + else + user[0] = '\0'; +} + +/* Finds the owner of process PID and returns the user id in OWNER. + Returns 0 if the owner was found, -1 otherwise. */ + +static int +get_process_owner (uid_t *owner, PID_T pid) +{ + struct stat statbuf; + char procentry[sizeof ("/proc/") + MAX_PID_T_STRLEN]; + + sprintf (procentry, "/proc/%lld", pid); + + if (stat (procentry, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) + { + *owner = statbuf.st_uid; + return 0; + } + else + return -1; +} + +/* Find the CPU cores used by process PID and return them in CORES. + CORES points to an array of NUM_CORES elements. */ + +static int +get_cores_used_by_process (PID_T pid, int *cores, const int num_cores) +{ + char taskdir[sizeof ("/proc/") + MAX_PID_T_STRLEN + sizeof ("/task") - 1]; + DIR *dir; + struct dirent *dp; + int task_count = 0; + + sprintf (taskdir, "/proc/%lld/task", pid); + dir = opendir (taskdir); + if (dir) + { + while ((dp = readdir (dir)) != NULL) + { + PID_T tid; + int core; + + if (!isdigit (dp->d_name[0]) + || NAMELEN (dp) > MAX_PID_T_STRLEN) + continue; + + sscanf (dp->d_name, "%lld", &tid); + core = linux_common_core_of_thread (ptid_build ((pid_t) pid, + (pid_t) tid, 0)); + + if (core >= 0 && core < num_cores) + { + ++cores[core]; + ++task_count; + } + } + + closedir (dir); + } + + return task_count; +} + +static LONGEST +linux_xfer_osdata_processes (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + /* We make the process list snapshot when the object starts to be read. */ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + DIR *dirp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + dirp = opendir ("/proc"); + if (dirp) + { + const int num_cores = sysconf (_SC_NPROCESSORS_ONLN); + struct dirent *dp; + + while ((dp = readdir (dirp)) != NULL) + { + PID_T pid; + uid_t owner; + char user[UT_NAMESIZE]; + char *command_line; + int *cores; + int task_count; + char *cores_str; + int i; + + if (!isdigit (dp->d_name[0]) + || NAMELEN (dp) > MAX_PID_T_STRLEN) + continue; + + sscanf (dp->d_name, "%lld", &pid); + command_line = commandline_from_pid (pid); + + if (get_process_owner (&owner, pid) == 0) + user_from_uid (user, sizeof (user), owner); + else + strcpy (user, "?"); + + /* Find CPU cores used by the process. */ + cores = (int *) xcalloc (num_cores, sizeof (int)); + task_count = get_cores_used_by_process (pid, cores, num_cores); + cores_str = (char *) xcalloc (task_count, sizeof ("4294967295") + 1); + + for (i = 0; i < num_cores && task_count > 0; ++i) + if (cores[i]) + { + char core_str[sizeof ("4294967295")]; + + sprintf (core_str, "%d", i); + strcat (cores_str, core_str); + + task_count -= cores[i]; + if (task_count > 0) + strcat (cores_str, ","); + } + + xfree (cores); + + buffer_xml_printf ( + &buffer, + "" + "%lld" + "%s" + "%s" + "%s" + "", + pid, + user, + command_line ? command_line : "", + cores_str); + + xfree (command_line); + xfree (cores_str); + } + + closedir (dirp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Auxiliary function used by qsort to sort processes by process + group. Compares two processes with ids PROCESS1 and PROCESS2. + PROCESS1 comes before PROCESS2 if it has a lower process group id. + If they belong to the same process group, PROCESS1 comes before + PROCESS2 if it has a lower process id or is the process group + leader. */ + +static int +compare_processes (const void *process1, const void *process2) +{ + PID_T pid1 = *((PID_T *) process1); + PID_T pid2 = *((PID_T *) process2); + PID_T pgid1 = *((PID_T *) process1 + 1); + PID_T pgid2 = *((PID_T *) process2 + 1); + + /* Sort by PGID. */ + if (pgid1 < pgid2) + return -1; + else if (pgid1 > pgid2) + return 1; + else + { + /* Process group leaders always come first, else sort by PID. */ + if (pid1 == pgid1) + return -1; + else if (pid2 == pgid2) + return 1; + else if (pid1 < pid2) + return -1; + else if (pid1 > pid2) + return 1; + else + return 0; + } +} + +/* Collect all process groups from /proc. */ + +static LONGEST +linux_xfer_osdata_processgroups (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + /* We make the process list snapshot when the object starts to be read. */ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + DIR *dirp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + dirp = opendir ("/proc"); + if (dirp) + { + struct dirent *dp; + const size_t list_block_size = 512; + PID_T *process_list = (PID_T *) xmalloc (list_block_size * 2 * sizeof (PID_T)); + size_t process_count = 0; + size_t i; + + /* Build list consisting of PIDs followed by their + associated PGID. */ + while ((dp = readdir (dirp)) != NULL) + { + PID_T pid, pgid; + + if (!isdigit (dp->d_name[0]) + || NAMELEN (dp) > MAX_PID_T_STRLEN) + continue; + + sscanf (dp->d_name, "%lld", &pid); + pgid = getpgid (pid); + + if (pgid > 0) + { + process_list[2 * process_count] = pid; + process_list[2 * process_count + 1] = pgid; + ++process_count; + + /* Increase the size of the list if necessary. */ + if (process_count % list_block_size == 0) + process_list = (PID_T *) xrealloc ( + process_list, + (process_count + list_block_size) + * 2 * sizeof (PID_T)); + } + } + + closedir (dirp); + + /* Sort the process list. */ + qsort (process_list, process_count, 2 * sizeof (PID_T), + compare_processes); + + for (i = 0; i < process_count; ++i) + { + PID_T pid = process_list[2 * i]; + PID_T pgid = process_list[2 * i + 1]; + char leader_command[32]; + char *command_line; + + command_from_pid (leader_command, sizeof (leader_command), pgid); + command_line = commandline_from_pid (pid); + + buffer_xml_printf ( + &buffer, + "" + "%lld" + "%s" + "%lld" + "%s" + "", + pgid, + leader_command, + pid, + command_line ? command_line : ""); + + xfree (command_line); + } + + xfree (process_list); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Collect all the threads in /proc by iterating through processes and + then tasks within each process. */ + +static LONGEST +linux_xfer_osdata_threads (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + /* We make the process list snapshot when the object starts to be read. */ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + DIR *dirp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + dirp = opendir ("/proc"); + if (dirp) + { + struct dirent *dp; + + while ((dp = readdir (dirp)) != NULL) + { + struct stat statbuf; + char procentry[sizeof ("/proc/4294967295")]; + + if (!isdigit (dp->d_name[0]) + || NAMELEN (dp) > sizeof ("4294967295") - 1) + continue; + + sprintf (procentry, "/proc/%s", dp->d_name); + if (stat (procentry, &statbuf) == 0 + && S_ISDIR (statbuf.st_mode)) + { + DIR *dirp2; + char *pathname; + PID_T pid; + char command[32]; + + pathname = xstrprintf ("/proc/%s/task", dp->d_name); + + pid = atoi (dp->d_name); + command_from_pid (command, sizeof (command), pid); + + dirp2 = opendir (pathname); + + if (dirp2) + { + struct dirent *dp2; + + while ((dp2 = readdir (dirp2)) != NULL) + { + PID_T tid; + int core; + + if (!isdigit (dp2->d_name[0]) + || NAMELEN (dp2) > sizeof ("4294967295") - 1) + continue; + + tid = atoi (dp2->d_name); + core = linux_common_core_of_thread (ptid_build (pid, tid, 0)); + + buffer_xml_printf ( + &buffer, + "" + "%lld" + "%s" + "%lld" + "%d" + "", + pid, + command, + tid, + core); + } + + closedir (dirp2); + } + + xfree (pathname); + } + } + + closedir (dirp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Collect all the open file descriptors found in /proc and put the details + found about them into READBUF. */ + +static LONGEST +linux_xfer_osdata_fds (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + /* We make the process list snapshot when the object starts to be read. */ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + DIR *dirp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + dirp = opendir ("/proc"); + if (dirp) + { + struct dirent *dp; + + while ((dp = readdir (dirp)) != NULL) + { + struct stat statbuf; + char procentry[sizeof ("/proc/4294967295")]; + + if (!isdigit (dp->d_name[0]) + || NAMELEN (dp) > sizeof ("4294967295") - 1) + continue; + + sprintf (procentry, "/proc/%s", dp->d_name); + if (stat (procentry, &statbuf) == 0 + && S_ISDIR (statbuf.st_mode)) + { + char *pathname; + DIR *dirp2; + PID_T pid; + char command[32]; + + pid = atoi (dp->d_name); + command_from_pid (command, sizeof (command), pid); + + pathname = xstrprintf ("/proc/%s/fd", dp->d_name); + dirp2 = opendir (pathname); + + if (dirp2) + { + struct dirent *dp2; + + while ((dp2 = readdir (dirp2)) != NULL) + { + char *fdname; + char buf[1000]; + ssize_t rslt; + + if (!isdigit (dp2->d_name[0])) + continue; + + fdname = xstrprintf ("%s/%s", pathname, dp2->d_name); + rslt = readlink (fdname, buf, sizeof (buf) - 1); + if (rslt >= 0) + buf[rslt] = '\0'; + + buffer_xml_printf ( + &buffer, + "" + "%s" + "%s" + "%s" + "%s" + "", + dp->d_name, + command, + dp2->d_name, + (rslt >= 0 ? buf : dp2->d_name)); + } + + closedir (dirp2); + } + + xfree (pathname); + } + } + + closedir (dirp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Returns the socket state STATE in textual form. */ + +static const char * +format_socket_state (unsigned char state) +{ + /* Copied from include/net/tcp_states.h in the Linux kernel sources. */ + enum { + TCP_ESTABLISHED = 1, + TCP_SYN_SENT, + TCP_SYN_RECV, + TCP_FIN_WAIT1, + TCP_FIN_WAIT2, + TCP_TIME_WAIT, + TCP_CLOSE, + TCP_CLOSE_WAIT, + TCP_LAST_ACK, + TCP_LISTEN, + TCP_CLOSING + }; + + switch (state) + { + case TCP_ESTABLISHED: + return "ESTABLISHED"; + case TCP_SYN_SENT: + return "SYN_SENT"; + case TCP_SYN_RECV: + return "SYN_RECV"; + case TCP_FIN_WAIT1: + return "FIN_WAIT1"; + case TCP_FIN_WAIT2: + return "FIN_WAIT2"; + case TCP_TIME_WAIT: + return "TIME_WAIT"; + case TCP_CLOSE: + return "CLOSE"; + case TCP_CLOSE_WAIT: + return "CLOSE_WAIT"; + case TCP_LAST_ACK: + return "LAST_ACK"; + case TCP_LISTEN: + return "LISTEN"; + case TCP_CLOSING: + return "CLOSING"; + default: + return "(unknown)"; + } +} + +union socket_addr + { + struct sockaddr sa; + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + }; + +/* Auxiliary function used by linux_xfer_osdata_isocket. Formats + information for all open internet sockets of type FAMILY on the + system into BUFFER. If TCP is set, only TCP sockets are processed, + otherwise only UDP sockets are processed. */ + +static void +print_sockets (unsigned short family, int tcp, struct buffer *buffer) +{ + const char *proc_file; + FILE *fp; + + if (family == AF_INET) + proc_file = tcp ? "/proc/net/tcp" : "/proc/net/udp"; + else if (family == AF_INET6) + proc_file = tcp ? "/proc/net/tcp6" : "/proc/net/udp6"; + else + return; + + fp = gdb_fopen_cloexec (proc_file, "r"); + if (fp) + { + char buf[8192]; + + do + { + if (fgets (buf, sizeof (buf), fp)) + { + uid_t uid; + unsigned int local_port, remote_port, state; + char local_address[NI_MAXHOST], remote_address[NI_MAXHOST]; + int result; + +#if NI_MAXHOST <= 32 +#error "local_address and remote_address buffers too small" +#endif + + result = sscanf (buf, + "%*d: %32[0-9A-F]:%X %32[0-9A-F]:%X %X %*X:%*X %*X:%*X %*X %d %*d %*u %*s\n", + local_address, &local_port, + remote_address, &remote_port, + &state, + &uid); + + if (result == 6) + { + union socket_addr locaddr, remaddr; + size_t addr_size; + char user[UT_NAMESIZE]; + char local_service[NI_MAXSERV], remote_service[NI_MAXSERV]; + + if (family == AF_INET) + { + sscanf (local_address, "%X", + &locaddr.sin.sin_addr.s_addr); + sscanf (remote_address, "%X", + &remaddr.sin.sin_addr.s_addr); + + locaddr.sin.sin_port = htons (local_port); + remaddr.sin.sin_port = htons (remote_port); + + addr_size = sizeof (struct sockaddr_in); + } + else + { + sscanf (local_address, "%8X%8X%8X%8X", + locaddr.sin6.sin6_addr.s6_addr32, + locaddr.sin6.sin6_addr.s6_addr32 + 1, + locaddr.sin6.sin6_addr.s6_addr32 + 2, + locaddr.sin6.sin6_addr.s6_addr32 + 3); + sscanf (remote_address, "%8X%8X%8X%8X", + remaddr.sin6.sin6_addr.s6_addr32, + remaddr.sin6.sin6_addr.s6_addr32 + 1, + remaddr.sin6.sin6_addr.s6_addr32 + 2, + remaddr.sin6.sin6_addr.s6_addr32 + 3); + + locaddr.sin6.sin6_port = htons (local_port); + remaddr.sin6.sin6_port = htons (remote_port); + + locaddr.sin6.sin6_flowinfo = 0; + remaddr.sin6.sin6_flowinfo = 0; + locaddr.sin6.sin6_scope_id = 0; + remaddr.sin6.sin6_scope_id = 0; + + addr_size = sizeof (struct sockaddr_in6); + } + + locaddr.sa.sa_family = remaddr.sa.sa_family = family; + + result = getnameinfo (&locaddr.sa, addr_size, + local_address, sizeof (local_address), + local_service, sizeof (local_service), + NI_NUMERICHOST | NI_NUMERICSERV + | (tcp ? 0 : NI_DGRAM)); + if (result) + continue; + + result = getnameinfo (&remaddr.sa, addr_size, + remote_address, + sizeof (remote_address), + remote_service, + sizeof (remote_service), + NI_NUMERICHOST | NI_NUMERICSERV + | (tcp ? 0 : NI_DGRAM)); + if (result) + continue; + + user_from_uid (user, sizeof (user), uid); + + buffer_xml_printf ( + buffer, + "" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "", + local_address, + local_service, + remote_address, + remote_service, + format_socket_state (state), + user, + (family == AF_INET) ? "INET" : "INET6", + tcp ? "STREAM" : "DGRAM"); + } + } + } + while (!feof (fp)); + + fclose (fp); + } +} + +/* Collect data about internet sockets and write it into READBUF. */ + +static LONGEST +linux_xfer_osdata_isockets (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + print_sockets (AF_INET, 1, &buffer); + print_sockets (AF_INET, 0, &buffer); + print_sockets (AF_INET6, 1, &buffer); + print_sockets (AF_INET6, 0, &buffer); + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Converts the time SECONDS into textual form and copies it into a + buffer TIME, with at most MAXLEN characters copied. */ + +static void +time_from_time_t (char *time, int maxlen, TIME_T seconds) +{ + if (!seconds) + time[0] = '\0'; + else + { + time_t t = (time_t) seconds; + + strncpy (time, ctime (&t), maxlen); + time[maxlen - 1] = '\0'; + } +} + +/* Finds the group name for the group GID and copies it into GROUP. + At most MAXLEN characters are copied. */ + +static void +group_from_gid (char *group, int maxlen, gid_t gid) +{ + struct group *grentry = getgrgid (gid); + + if (grentry) + { + strncpy (group, grentry->gr_name, maxlen); + /* Ensure that the group name is null-terminated. */ + group[maxlen - 1] = '\0'; + } + else + group[0] = '\0'; +} + +/* Collect data about shared memory recorded in /proc and write it + into READBUF. */ + +static LONGEST +linux_xfer_osdata_shm (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + FILE *fp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + fp = gdb_fopen_cloexec ("/proc/sysvipc/shm", "r"); + if (fp) + { + char buf[8192]; + + do + { + if (fgets (buf, sizeof (buf), fp)) + { + key_t key; + uid_t uid, cuid; + gid_t gid, cgid; + PID_T cpid, lpid; + int shmid, size, nattch; + TIME_T atime, dtime, ctime; + unsigned int perms; + int items_read; + + items_read = sscanf (buf, + "%d %d %o %d %lld %lld %d %u %u %u %u %lld %lld %lld", + &key, &shmid, &perms, &size, + &cpid, &lpid, + &nattch, + &uid, &gid, &cuid, &cgid, + &atime, &dtime, &ctime); + + if (items_read == 14) + { + char user[UT_NAMESIZE], group[UT_NAMESIZE]; + char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE]; + char ccmd[32], lcmd[32]; + char atime_str[32], dtime_str[32], ctime_str[32]; + + user_from_uid (user, sizeof (user), uid); + group_from_gid (group, sizeof (group), gid); + user_from_uid (cuser, sizeof (cuser), cuid); + group_from_gid (cgroup, sizeof (cgroup), cgid); + + command_from_pid (ccmd, sizeof (ccmd), cpid); + command_from_pid (lcmd, sizeof (lcmd), lpid); + + time_from_time_t (atime_str, sizeof (atime_str), atime); + time_from_time_t (dtime_str, sizeof (dtime_str), dtime); + time_from_time_t (ctime_str, sizeof (ctime_str), ctime); + + buffer_xml_printf ( + &buffer, + "" + "%d" + "%d" + "%o" + "%d" + "%s" + "%s" + "%d" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "", + key, + shmid, + perms, + size, + ccmd, + lcmd, + nattch, + user, + group, + cuser, + cgroup, + atime_str, + dtime_str, + ctime_str); + } + } + } + while (!feof (fp)); + + fclose (fp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Collect data about semaphores recorded in /proc and write it + into READBUF. */ + +static LONGEST +linux_xfer_osdata_sem (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + FILE *fp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + fp = gdb_fopen_cloexec ("/proc/sysvipc/sem", "r"); + if (fp) + { + char buf[8192]; + + do + { + if (fgets (buf, sizeof (buf), fp)) + { + key_t key; + uid_t uid, cuid; + gid_t gid, cgid; + unsigned int perms, nsems; + int semid; + TIME_T otime, ctime; + int items_read; + + items_read = sscanf (buf, + "%d %d %o %u %d %d %d %d %lld %lld", + &key, &semid, &perms, &nsems, + &uid, &gid, &cuid, &cgid, + &otime, &ctime); + + if (items_read == 10) + { + char user[UT_NAMESIZE], group[UT_NAMESIZE]; + char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE]; + char otime_str[32], ctime_str[32]; + + user_from_uid (user, sizeof (user), uid); + group_from_gid (group, sizeof (group), gid); + user_from_uid (cuser, sizeof (cuser), cuid); + group_from_gid (cgroup, sizeof (cgroup), cgid); + + time_from_time_t (otime_str, sizeof (otime_str), otime); + time_from_time_t (ctime_str, sizeof (ctime_str), ctime); + + buffer_xml_printf ( + &buffer, + "" + "%d" + "%d" + "%o" + "%u" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "", + key, + semid, + perms, + nsems, + user, + group, + cuser, + cgroup, + otime_str, + ctime_str); + } + } + } + while (!feof (fp)); + + fclose (fp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Collect data about message queues recorded in /proc and write it + into READBUF. */ + +static LONGEST +linux_xfer_osdata_msg (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + FILE *fp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + fp = gdb_fopen_cloexec ("/proc/sysvipc/msg", "r"); + if (fp) + { + char buf[8192]; + + do + { + if (fgets (buf, sizeof (buf), fp)) + { + key_t key; + PID_T lspid, lrpid; + uid_t uid, cuid; + gid_t gid, cgid; + unsigned int perms, cbytes, qnum; + int msqid; + TIME_T stime, rtime, ctime; + int items_read; + + items_read = sscanf (buf, + "%d %d %o %u %u %lld %lld %d %d %d %d %lld %lld %lld", + &key, &msqid, &perms, &cbytes, &qnum, + &lspid, &lrpid, &uid, &gid, &cuid, &cgid, + &stime, &rtime, &ctime); + + if (items_read == 14) + { + char user[UT_NAMESIZE], group[UT_NAMESIZE]; + char cuser[UT_NAMESIZE], cgroup[UT_NAMESIZE]; + char lscmd[32], lrcmd[32]; + char stime_str[32], rtime_str[32], ctime_str[32]; + + user_from_uid (user, sizeof (user), uid); + group_from_gid (group, sizeof (group), gid); + user_from_uid (cuser, sizeof (cuser), cuid); + group_from_gid (cgroup, sizeof (cgroup), cgid); + + command_from_pid (lscmd, sizeof (lscmd), lspid); + command_from_pid (lrcmd, sizeof (lrcmd), lrpid); + + time_from_time_t (stime_str, sizeof (stime_str), stime); + time_from_time_t (rtime_str, sizeof (rtime_str), rtime); + time_from_time_t (ctime_str, sizeof (ctime_str), ctime); + + buffer_xml_printf ( + &buffer, + "" + "%d" + "%d" + "%o" + "%u" + "%u" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "%s" + "", + key, + msqid, + perms, + cbytes, + qnum, + lscmd, + lrcmd, + user, + group, + cuser, + cgroup, + stime_str, + rtime_str, + ctime_str); + } + } + } + while (!feof (fp)); + + fclose (fp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +/* Collect data about loaded kernel modules and write it into + READBUF. */ + +static LONGEST +linux_xfer_osdata_modules (gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + FILE *fp; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + fp = gdb_fopen_cloexec ("/proc/modules", "r"); + if (fp) + { + char buf[8192]; + + do + { + if (fgets (buf, sizeof (buf), fp)) + { + char *name, *dependencies, *status, *tmp; + unsigned int size; + unsigned long long address; + int uses; + + name = strtok (buf, " "); + if (name == NULL) + continue; + + tmp = strtok (NULL, " "); + if (tmp == NULL) + continue; + if (sscanf (tmp, "%u", &size) != 1) + continue; + + tmp = strtok (NULL, " "); + if (tmp == NULL) + continue; + if (sscanf (tmp, "%d", &uses) != 1) + continue; + + dependencies = strtok (NULL, " "); + if (dependencies == NULL) + continue; + + status = strtok (NULL, " "); + if (status == NULL) + continue; + + tmp = strtok (NULL, "\n"); + if (tmp == NULL) + continue; + if (sscanf (tmp, "%llx", &address) != 1) + continue; + + buffer_xml_printf ( + &buffer, + "" + "%s" + "%u" + "%d" + "%s" + "%s" + "%llx" + "", + name, + size, + uses, + dependencies, + status, + address); + } + } + while (!feof (fp)); + + fclose (fp); + } + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; +} + +struct osdata_type { + char *type; + char *title; + char *description; + LONGEST (*getter) (gdb_byte *readbuf, ULONGEST offset, ULONGEST len); +} osdata_table[] = { + { "processes", "Processes", "Listing of all processes", + linux_xfer_osdata_processes }, + { "procgroups", "Process groups", "Listing of all process groups", + linux_xfer_osdata_processgroups }, + { "threads", "Threads", "Listing of all threads", + linux_xfer_osdata_threads }, + { "files", "File descriptors", "Listing of all file descriptors", + linux_xfer_osdata_fds }, + { "sockets", "Sockets", "Listing of all internet-domain sockets", + linux_xfer_osdata_isockets }, + { "shm", "Shared-memory regions", "Listing of all shared-memory regions", + linux_xfer_osdata_shm }, + { "semaphores", "Semaphores", "Listing of all semaphores", + linux_xfer_osdata_sem }, + { "msg", "Message queues", "Listing of all message queues", + linux_xfer_osdata_msg }, + { "modules", "Kernel modules", "Listing of all loaded kernel modules", + linux_xfer_osdata_modules }, + { NULL, NULL, NULL } +}; + +LONGEST +linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + if (!annex || *annex == '\0') + { + static const char *buf; + static LONGEST len_avail = -1; + static struct buffer buffer; + + if (offset == 0) + { + int i; + + if (len_avail != -1 && len_avail != 0) + buffer_free (&buffer); + len_avail = 0; + buf = NULL; + buffer_init (&buffer); + buffer_grow_str (&buffer, "\n"); + + for (i = 0; osdata_table[i].type; ++i) + buffer_xml_printf ( + &buffer, + "" + "%s" + "%s" + "%s" + "", + osdata_table[i].type, + osdata_table[i].description, + osdata_table[i].title); + + buffer_grow_str0 (&buffer, "\n"); + buf = buffer_finish (&buffer); + len_avail = strlen (buf); + } + + if (offset >= len_avail) + { + /* Done. Get rid of the buffer. */ + buffer_free (&buffer); + buf = NULL; + len_avail = 0; + return 0; + } + + if (len > len_avail - offset) + len = len_avail - offset; + memcpy (readbuf, buf + offset, len); + + return len; + } + else + { + int i; + + for (i = 0; osdata_table[i].type; ++i) + { + if (strcmp (annex, osdata_table[i].type) == 0) + { + gdb_assert (readbuf); + + return (osdata_table[i].getter) (readbuf, offset, len); + } + } + + return 0; + } +} + diff --git a/gdb/nat/linux-osdata.h b/gdb/nat/linux-osdata.h new file mode 100644 index 0000000..e9d4f3c --- /dev/null +++ b/gdb/nat/linux-osdata.h @@ -0,0 +1,29 @@ +/* Linux-specific functions to retrieve OS data. + + Copyright (C) 2009-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef COMMON_LINUX_OSDATA_H +#define COMMON_LINUX_OSDATA_H + +#include "ptid.h" + +extern int linux_common_core_of_thread (ptid_t ptid); +extern LONGEST linux_common_xfer_osdata (const char *annex, gdb_byte *readbuf, + ULONGEST offset, ULONGEST len); + +#endif diff --git a/gdb/nat/linux-procfs.c b/gdb/nat/linux-procfs.c new file mode 100644 index 0000000..1443a88 --- /dev/null +++ b/gdb/nat/linux-procfs.c @@ -0,0 +1,121 @@ +/* Linux-specific PROCFS manipulation routines. + Copyright (C) 2009-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#include +#endif + +#include "linux-procfs.h" +#include "filestuff.h" + +/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not + found. */ + +static int +linux_proc_get_int (pid_t lwpid, const char *field) +{ + size_t field_len = strlen (field); + FILE *status_file; + char buf[100]; + int retval = -1; + + snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); + status_file = gdb_fopen_cloexec (buf, "r"); + if (status_file == NULL) + { + warning (_("unable to open /proc file '%s'"), buf); + return -1; + } + + while (fgets (buf, sizeof (buf), status_file)) + if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':') + { + retval = strtol (&buf[field_len + 1], NULL, 10); + break; + } + + fclose (status_file); + return retval; +} + +/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not + found. */ + +int +linux_proc_get_tgid (pid_t lwpid) +{ + return linux_proc_get_int (lwpid, "Tgid"); +} + +/* See linux-procfs.h. */ + +pid_t +linux_proc_get_tracerpid (pid_t lwpid) +{ + return linux_proc_get_int (lwpid, "TracerPid"); +} + +/* Return non-zero if 'State' of /proc/PID/status contains STATE. */ + +static int +linux_proc_pid_has_state (pid_t pid, const char *state) +{ + char buffer[100]; + FILE *procfile; + int retval; + int have_state; + + xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid); + procfile = gdb_fopen_cloexec (buffer, "r"); + if (procfile == NULL) + { + warning (_("unable to open /proc file '%s'"), buffer); + return 0; + } + + have_state = 0; + while (fgets (buffer, sizeof (buffer), procfile) != NULL) + if (strncmp (buffer, "State:", 6) == 0) + { + have_state = 1; + break; + } + retval = (have_state && strstr (buffer, state) != NULL); + fclose (procfile); + return retval; +} + +/* Detect `T (stopped)' in `/proc/PID/status'. + Other states including `T (tracing stop)' are reported as false. */ + +int +linux_proc_pid_is_stopped (pid_t pid) +{ + return linux_proc_pid_has_state (pid, "T (stopped)"); +} + +/* See linux-procfs.h declaration. */ + +int +linux_proc_pid_is_zombie (pid_t pid) +{ + return linux_proc_pid_has_state (pid, "Z (zombie)"); +} diff --git a/gdb/nat/linux-procfs.h b/gdb/nat/linux-procfs.h new file mode 100644 index 0000000..d13fff7 --- /dev/null +++ b/gdb/nat/linux-procfs.h @@ -0,0 +1,43 @@ +/* Linux-specific PROCFS manipulation routines. + Copyright (C) 2011-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef COMMON_LINUX_PROCFS_H +#define COMMON_LINUX_PROCFS_H + +#include + +/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not + found. */ + +extern int linux_proc_get_tgid (pid_t lwpid); + +/* Return the TracerPid of LWPID from /proc/pid/status. Returns -1 if not + found. */ + +extern pid_t linux_proc_get_tracerpid (pid_t lwpid); + +/* Detect `T (stopped)' in `/proc/PID/status'. + Other states including `T (tracing stop)' are reported as false. */ + +extern int linux_proc_pid_is_stopped (pid_t pid); + +/* Return non-zero if PID is a zombie. */ + +extern int linux_proc_pid_is_zombie (pid_t pid); + +#endif /* COMMON_LINUX_PROCFS_H */ diff --git a/gdb/nat/linux-ptrace.c b/gdb/nat/linux-ptrace.c new file mode 100644 index 0000000..3ad2113 --- /dev/null +++ b/gdb/nat/linux-ptrace.c @@ -0,0 +1,553 @@ +/* Linux-specific ptrace manipulation routines. + Copyright (C) 2012-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#include +#endif + +#include "linux-ptrace.h" +#include "linux-procfs.h" +#include "linux-waitpid.h" +#include "buffer.h" +#include "gdb_assert.h" +#include "gdb_wait.h" + +#include + +/* Stores the currently supported ptrace options. A value of + -1 means we did not check for features yet. A value of 0 means + there are no supported features. */ +static int current_ptrace_options = -1; + +/* Find all possible reasons we could fail to attach PID and append + these as strings to the already initialized BUFFER. '\0' + termination of BUFFER must be done by the caller. */ + +void +linux_ptrace_attach_fail_reason (pid_t pid, struct buffer *buffer) +{ + pid_t tracerpid; + + tracerpid = linux_proc_get_tracerpid (pid); + if (tracerpid > 0) + buffer_xml_printf (buffer, _("process %d is already traced " + "by process %d"), + (int) pid, (int) tracerpid); + + if (linux_proc_pid_is_zombie (pid)) + buffer_xml_printf (buffer, _("process %d is a zombie " + "- the process has already terminated"), + (int) pid); +} + +#if defined __i386__ || defined __x86_64__ + +/* Address of the 'ret' instruction in asm code block below. */ +extern void (linux_ptrace_test_ret_to_nx_instr) (void); + +#include +#include +#include + +#endif /* defined __i386__ || defined __x86_64__ */ + +/* Test broken off-trunk Linux kernel patchset for NX support on i386. It was + removed in Fedora kernel 88fa1f0332d188795ed73d7ac2b1564e11a0b4cd. + + Test also x86_64 arch for PaX support. */ + +static void +linux_ptrace_test_ret_to_nx (void) +{ +#if defined __i386__ || defined __x86_64__ + pid_t child, got_pid; + gdb_byte *return_address, *pc; + long l; + int status, kill_status; + + return_address = mmap (NULL, 2, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (return_address == MAP_FAILED) + { + warning (_("linux_ptrace_test_ret_to_nx: Cannot mmap: %s"), + strerror (errno)); + return; + } + + /* Put there 'int3'. */ + *return_address = 0xcc; + + child = fork (); + switch (child) + { + case -1: + warning (_("linux_ptrace_test_ret_to_nx: Cannot fork: %s"), + strerror (errno)); + return; + + case 0: + l = ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) NULL, + (PTRACE_TYPE_ARG4) NULL); + if (l != 0) + warning (_("linux_ptrace_test_ret_to_nx: Cannot PTRACE_TRACEME: %s"), + strerror (errno)); + else + { +#if defined __i386__ + asm volatile ("pushl %0;" + ".globl linux_ptrace_test_ret_to_nx_instr;" + "linux_ptrace_test_ret_to_nx_instr:" + "ret" + : : "r" (return_address) : "%esp", "memory"); +#elif defined __x86_64__ + asm volatile ("pushq %0;" + ".globl linux_ptrace_test_ret_to_nx_instr;" + "linux_ptrace_test_ret_to_nx_instr:" + "ret" + : : "r" ((uint64_t) (uintptr_t) return_address) + : "%rsp", "memory"); +#else +# error "!__i386__ && !__x86_64__" +#endif + gdb_assert_not_reached ("asm block did not terminate"); + } + + _exit (1); + } + + errno = 0; + got_pid = waitpid (child, &status, 0); + if (got_pid != child) + { + warning (_("linux_ptrace_test_ret_to_nx: waitpid returned %ld: %s"), + (long) got_pid, strerror (errno)); + return; + } + + if (WIFSIGNALED (status)) + { + if (WTERMSIG (status) != SIGKILL) + warning (_("linux_ptrace_test_ret_to_nx: WTERMSIG %d is not SIGKILL!"), + (int) WTERMSIG (status)); + else + warning (_("Cannot call inferior functions, Linux kernel PaX " + "protection forbids return to non-executable pages!")); + return; + } + + if (!WIFSTOPPED (status)) + { + warning (_("linux_ptrace_test_ret_to_nx: status %d is not WIFSTOPPED!"), + status); + return; + } + + /* We may get SIGSEGV due to missing PROT_EXEC of the return_address. */ + if (WSTOPSIG (status) != SIGTRAP && WSTOPSIG (status) != SIGSEGV) + { + warning (_("linux_ptrace_test_ret_to_nx: " + "WSTOPSIG %d is neither SIGTRAP nor SIGSEGV!"), + (int) WSTOPSIG (status)); + return; + } + + errno = 0; +#if defined __i386__ + l = ptrace (PTRACE_PEEKUSER, child, (PTRACE_TYPE_ARG3) (uintptr_t) (EIP * 4), + (PTRACE_TYPE_ARG4) NULL); +#elif defined __x86_64__ + l = ptrace (PTRACE_PEEKUSER, child, (PTRACE_TYPE_ARG3) (uintptr_t) (RIP * 8), + (PTRACE_TYPE_ARG4) NULL); +#else +# error "!__i386__ && !__x86_64__" +#endif + if (errno != 0) + { + warning (_("linux_ptrace_test_ret_to_nx: Cannot PTRACE_PEEKUSER: %s"), + strerror (errno)); + return; + } + pc = (void *) (uintptr_t) l; + + kill (child, SIGKILL); + ptrace (PTRACE_KILL, child, (PTRACE_TYPE_ARG3) NULL, + (PTRACE_TYPE_ARG4) NULL); + + errno = 0; + got_pid = waitpid (child, &kill_status, 0); + if (got_pid != child) + { + warning (_("linux_ptrace_test_ret_to_nx: " + "PTRACE_KILL waitpid returned %ld: %s"), + (long) got_pid, strerror (errno)); + return; + } + if (!WIFSIGNALED (kill_status)) + { + warning (_("linux_ptrace_test_ret_to_nx: " + "PTRACE_KILL status %d is not WIFSIGNALED!"), + status); + return; + } + + /* + 1 is there as x86* stops after the 'int3' instruction. */ + if (WSTOPSIG (status) == SIGTRAP && pc == return_address + 1) + { + /* PASS */ + return; + } + + /* We may get SIGSEGV due to missing PROT_EXEC of the RETURN_ADDRESS page. */ + if (WSTOPSIG (status) == SIGSEGV && pc == return_address) + { + /* PASS */ + return; + } + + if ((void (*) (void)) pc != &linux_ptrace_test_ret_to_nx_instr) + warning (_("linux_ptrace_test_ret_to_nx: PC %p is neither near return " + "address %p nor is the return instruction %p!"), + pc, return_address, &linux_ptrace_test_ret_to_nx_instr); + else + warning (_("Cannot call inferior functions on this system - " + "Linux kernel with broken i386 NX (non-executable pages) " + "support detected!")); +#endif /* defined __i386__ || defined __x86_64__ */ +} + +/* Helper function to fork a process and make the child process call + the function FUNCTION, passing CHILD_STACK as parameter. + + For MMU-less targets, clone is used instead of fork, and + CHILD_STACK is used as stack space for the cloned child. If NULL, + stack space is allocated via malloc (and subsequently passed to + FUNCTION). For MMU targets, CHILD_STACK is ignored. */ + +static int +linux_fork_to_function (gdb_byte *child_stack, void (*function) (gdb_byte *)) +{ + int child_pid; + + /* Sanity check the function pointer. */ + gdb_assert (function != NULL); + +#if defined(__UCLIBC__) && defined(HAS_NOMMU) +#define STACK_SIZE 4096 + + if (child_stack == NULL) + child_stack = xmalloc (STACK_SIZE * 4); + + /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ +#ifdef __ia64__ + child_pid = __clone2 (function, child_stack, STACK_SIZE, + CLONE_VM | SIGCHLD, child_stack + STACK_SIZE * 2); +#else /* !__ia64__ */ + child_pid = clone (function, child_stack + STACK_SIZE, + CLONE_VM | SIGCHLD, child_stack + STACK_SIZE * 2); +#endif /* !__ia64__ */ +#else /* !defined(__UCLIBC) && defined(HAS_NOMMU) */ + child_pid = fork (); + + if (child_pid == 0) + function (NULL); +#endif /* defined(__UCLIBC) && defined(HAS_NOMMU) */ + + if (child_pid == -1) + perror_with_name (("fork")); + + return child_pid; +} + +/* A helper function for linux_check_ptrace_features, called after + the child forks a grandchild. */ + +static void +linux_grandchild_function (gdb_byte *child_stack) +{ + /* Free any allocated stack. */ + xfree (child_stack); + + /* This code is only reacheable by the grandchild (child's child) + process. */ + _exit (0); +} + +/* A helper function for linux_check_ptrace_features, called after + the parent process forks a child. The child allows itself to + be traced by its parent. */ + +static void +linux_child_function (gdb_byte *child_stack) +{ + ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); + kill (getpid (), SIGSTOP); + + /* Fork a grandchild. */ + linux_fork_to_function (child_stack, linux_grandchild_function); + + /* This code is only reacheable by the child (grandchild's parent) + process. */ + _exit (0); +} + +static void linux_test_for_tracesysgood (int child_pid); +static void linux_test_for_tracefork (int child_pid); + +/* Determine ptrace features available on this target. */ + +static void +linux_check_ptrace_features (void) +{ + int child_pid, ret, status; + + /* Initialize the options. */ + current_ptrace_options = 0; + + /* Fork a child so we can do some testing. The child will call + linux_child_function and will get traced. The child will + eventually fork a grandchild so we can test fork event + reporting. */ + child_pid = linux_fork_to_function (NULL, linux_child_function); + + ret = my_waitpid (child_pid, &status, 0); + if (ret == -1) + perror_with_name (("waitpid")); + else if (ret != child_pid) + error (_("linux_check_ptrace_features: waitpid: unexpected result %d."), + ret); + if (! WIFSTOPPED (status)) + error (_("linux_check_ptrace_features: waitpid: unexpected status %d."), + status); + + linux_test_for_tracesysgood (child_pid); + + linux_test_for_tracefork (child_pid); + + /* Clean things up and kill any pending children. */ + do + { + ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) 0); + if (ret != 0) + warning (_("linux_check_ptrace_features: failed to kill child")); + my_waitpid (child_pid, &status, 0); + } + while (WIFSTOPPED (status)); +} + +/* Determine if PTRACE_O_TRACESYSGOOD can be used to catch + syscalls. */ + +static void +linux_test_for_tracesysgood (int child_pid) +{ +#ifdef GDBSERVER + /* gdbserver does not support PTRACE_O_TRACESYSGOOD. */ +#else + int ret; + + ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) PTRACE_O_TRACESYSGOOD); + if (ret == 0) + current_ptrace_options |= PTRACE_O_TRACESYSGOOD; +#endif +} + +/* Determine if PTRACE_O_TRACEFORK can be used to follow fork + events. */ + +static void +linux_test_for_tracefork (int child_pid) +{ + int ret, status; + long second_pid; + + /* First, set the PTRACE_O_TRACEFORK option. If this fails, we + know for sure that it is not supported. */ + ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) PTRACE_O_TRACEFORK); + + if (ret != 0) + return; + +#ifdef GDBSERVER + /* gdbserver does not support PTRACE_O_TRACEVFORKDONE yet. */ +#else + /* Check if the target supports PTRACE_O_TRACEVFORKDONE. */ + ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) (PTRACE_O_TRACEFORK + | PTRACE_O_TRACEVFORKDONE)); + if (ret == 0) + current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; +#endif + + /* Setting PTRACE_O_TRACEFORK did not cause an error, however we + don't know for sure that the feature is available; old + versions of PTRACE_SETOPTIONS ignored unknown options. + Therefore, we attach to the child process, use PTRACE_SETOPTIONS + to enable fork tracing, and let it fork. If the process exits, + we assume that we can't use PTRACE_O_TRACEFORK; if we get the + fork notification, and we can extract the new child's PID, then + we assume that we can. + + We do not explicitly check for vfork tracing here. It is + assumed that vfork tracing is available whenever fork tracing + is available. */ + ret = ptrace (PTRACE_CONT, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) 0); + if (ret != 0) + warning (_("linux_test_for_tracefork: failed to resume child")); + + ret = my_waitpid (child_pid, &status, 0); + + /* Check if we received a fork event notification. */ + if (ret == child_pid && WIFSTOPPED (status) + && status >> 16 == PTRACE_EVENT_FORK) + { + /* We did receive a fork event notification. Make sure its PID + is reported. */ + second_pid = 0; + ret = ptrace (PTRACE_GETEVENTMSG, child_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) &second_pid); + if (ret == 0 && second_pid != 0) + { + int second_status; + + /* We got the PID from the grandchild, which means fork + tracing is supported. */ +#ifdef GDBSERVER + /* Do not enable all the options for now since gdbserver does not + properly support them. This restriction will be lifted when + gdbserver is augmented to support them. */ + current_ptrace_options |= PTRACE_O_TRACECLONE; +#else + current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK + | PTRACE_O_TRACECLONE | PTRACE_O_TRACEEXEC; + + /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to + support read-only process state. */ +#endif + + /* Do some cleanup and kill the grandchild. */ + my_waitpid (second_pid, &second_status, 0); + ret = ptrace (PTRACE_KILL, second_pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) 0); + if (ret != 0) + warning (_("linux_test_for_tracefork: " + "failed to kill second child")); + my_waitpid (second_pid, &status, 0); + } + } + else + warning (_("linux_test_for_tracefork: unexpected result from waitpid " + "(%d, status 0x%x)"), ret, status); +} + +/* Enable reporting of all currently supported ptrace events. */ + +void +linux_enable_event_reporting (pid_t pid) +{ + /* Check if we have initialized the ptrace features for this + target. If not, do it now. */ + if (current_ptrace_options == -1) + linux_check_ptrace_features (); + + /* Set the options. */ + ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_TYPE_ARG3) 0, + (PTRACE_TYPE_ARG4) (uintptr_t) current_ptrace_options); +} + +/* Disable reporting of all currently supported ptrace events. */ + +void +linux_disable_event_reporting (pid_t pid) +{ + /* Set the options. */ + ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_TYPE_ARG3) 0, 0); +} + +/* Returns non-zero if PTRACE_OPTIONS is contained within + CURRENT_PTRACE_OPTIONS, therefore supported. Returns 0 + otherwise. */ + +static int +ptrace_supports_feature (int ptrace_options) +{ + gdb_assert (current_ptrace_options >= 0); + + return ((current_ptrace_options & ptrace_options) == ptrace_options); +} + +/* Returns non-zero if PTRACE_EVENT_FORK is supported by ptrace, + 0 otherwise. Note that if PTRACE_EVENT_FORK is supported so is + PTRACE_EVENT_CLONE, PTRACE_EVENT_EXEC and PTRACE_EVENT_VFORK, + since they were all added to the kernel at the same time. */ + +int +linux_supports_tracefork (void) +{ + return ptrace_supports_feature (PTRACE_O_TRACEFORK); +} + +/* Returns non-zero if PTRACE_EVENT_CLONE is supported by ptrace, + 0 otherwise. Note that if PTRACE_EVENT_CLONE is supported so is + PTRACE_EVENT_FORK, PTRACE_EVENT_EXEC and PTRACE_EVENT_VFORK, + since they were all added to the kernel at the same time. */ + +int +linux_supports_traceclone (void) +{ + return ptrace_supports_feature (PTRACE_O_TRACECLONE); +} + +/* Returns non-zero if PTRACE_O_TRACEVFORKDONE is supported by + ptrace, 0 otherwise. */ + +int +linux_supports_tracevforkdone (void) +{ + return ptrace_supports_feature (PTRACE_O_TRACEVFORKDONE); +} + +/* Returns non-zero if PTRACE_O_TRACESYSGOOD is supported by ptrace, + 0 otherwise. */ + +int +linux_supports_tracesysgood (void) +{ + return ptrace_supports_feature (PTRACE_O_TRACESYSGOOD); +} + +/* Display possible problems on this system. Display them only once per GDB + execution. */ + +void +linux_ptrace_init_warnings (void) +{ + static int warned = 0; + + if (warned) + return; + warned = 1; + + linux_ptrace_test_ret_to_nx (); +} diff --git a/gdb/nat/linux-ptrace.h b/gdb/nat/linux-ptrace.h new file mode 100644 index 0000000..cffb5ce --- /dev/null +++ b/gdb/nat/linux-ptrace.h @@ -0,0 +1,95 @@ +/* Copyright (C) 2011-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef COMMON_LINUX_PTRACE_H +#define COMMON_LINUX_PTRACE_H + +struct buffer; + +#include + +#ifdef __UCLIBC__ +#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) +/* PTRACE_TEXT_ADDR and friends. */ +#include +#define HAS_NOMMU +#endif +#endif + +#if !defined(PTRACE_TYPE_ARG3) +#define PTRACE_TYPE_ARG3 void * +#endif + +#if !defined(PTRACE_TYPE_ARG4) +#define PTRACE_TYPE_ARG4 void * +#endif + +#ifndef PTRACE_GETSIGINFO +# define PTRACE_GETSIGINFO 0x4202 +# define PTRACE_SETSIGINFO 0x4203 +#endif /* PTRACE_GETSIGINF */ + +/* If the system headers did not provide the constants, hard-code the normal + values. */ +#ifndef PTRACE_EVENT_FORK + +#define PTRACE_SETOPTIONS 0x4200 +#define PTRACE_GETEVENTMSG 0x4201 + +/* options set using PTRACE_SETOPTIONS */ +#define PTRACE_O_TRACESYSGOOD 0x00000001 +#define PTRACE_O_TRACEFORK 0x00000002 +#define PTRACE_O_TRACEVFORK 0x00000004 +#define PTRACE_O_TRACECLONE 0x00000008 +#define PTRACE_O_TRACEEXEC 0x00000010 +#define PTRACE_O_TRACEVFORKDONE 0x00000020 +#define PTRACE_O_TRACEEXIT 0x00000040 + +/* Wait extended result codes for the above trace options. */ +#define PTRACE_EVENT_FORK 1 +#define PTRACE_EVENT_VFORK 2 +#define PTRACE_EVENT_CLONE 3 +#define PTRACE_EVENT_EXEC 4 +#define PTRACE_EVENT_VFORK_DONE 5 +#define PTRACE_EVENT_EXIT 6 + +#endif /* PTRACE_EVENT_FORK */ + +#if (defined __bfin__ || defined __frv__ || defined __sh__) \ + && !defined PTRACE_GETFDPIC +#define PTRACE_GETFDPIC 31 +#define PTRACE_GETFDPIC_EXEC 0 +#define PTRACE_GETFDPIC_INTERP 1 +#endif + +/* We can't always assume that this flag is available, but all systems + with the ptrace event handlers also have __WALL, so it's safe to use + in some contexts. */ +#ifndef __WALL +#define __WALL 0x40000000 /* Wait for any child. */ +#endif + +extern void linux_ptrace_attach_fail_reason (pid_t pid, struct buffer *buffer); +extern void linux_ptrace_init_warnings (void); +extern void linux_enable_event_reporting (pid_t pid); +extern void linux_disable_event_reporting (pid_t pid); +extern int linux_supports_tracefork (void); +extern int linux_supports_traceclone (void); +extern int linux_supports_tracevforkdone (void); +extern int linux_supports_tracesysgood (void); + +#endif /* COMMON_LINUX_PTRACE_H */ diff --git a/gdb/nat/linux-waitpid.c b/gdb/nat/linux-waitpid.c index 4693120..5159f03 100644 --- a/gdb/nat/linux-waitpid.c +++ b/gdb/nat/linux-waitpid.c @@ -24,8 +24,8 @@ #include "signal.h" #endif -#include "nat/linux-nat.h" -#include "nat/linux-waitpid.h" +#include "linux-nat.h" +#include "linux-waitpid.h" #include "gdb_wait.h" #include diff --git a/gdb/nat/mips-linux-watch.c b/gdb/nat/mips-linux-watch.c new file mode 100644 index 0000000..acfc7f4 --- /dev/null +++ b/gdb/nat/mips-linux-watch.c @@ -0,0 +1,349 @@ +/* Copyright (C) 2009-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#include +#include "mips-linux-watch.h" +#include "gdb_assert.h" + +/* Assuming usable watch registers REGS, return the irw_mask of + register N. */ + +uint32_t +mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watch_masks[n] & IRW_MASK; + case pt_watch_style_mips64: + return regs->mips64.watch_masks[n] & IRW_MASK; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the reg_mask of + register N. */ + +static uint32_t +get_reg_mask (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watch_masks[n] & ~IRW_MASK; + case pt_watch_style_mips64: + return regs->mips64.watch_masks[n] & ~IRW_MASK; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the num_valid. */ + +uint32_t +mips_linux_watch_get_num_valid (struct pt_watch_regs *regs) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.num_valid; + case pt_watch_style_mips64: + return regs->mips64.num_valid; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the watchlo of + register N. */ + +CORE_ADDR +mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watchlo[n]; + case pt_watch_style_mips64: + return regs->mips64.watchlo[n]; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, set watchlo of register N to + VALUE. */ + +void +mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n, + CORE_ADDR value) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + /* The cast will never throw away bits as 64 bit addresses can + never be used on a 32 bit kernel. */ + regs->mips32.watchlo[n] = (uint32_t) value; + break; + case pt_watch_style_mips64: + regs->mips64.watchlo[n] = value; + break; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the watchhi of + register N. */ + +uint32_t +mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watchhi[n]; + case pt_watch_style_mips64: + return regs->mips64.watchhi[n]; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, set watchhi of register N to + VALUE. */ + +void +mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n, + uint16_t value) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + regs->mips32.watchhi[n] = value; + break; + case pt_watch_style_mips64: + regs->mips64.watchhi[n] = value; + break; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Read the watch registers of process LWPID and store it in + WATCH_READBACK. Save true to *WATCH_READBACK_VALID if watch + registers are valid. Return 1 if watch registers are usable. + Cached information is used unless FORCE is true. */ + +int +mips_linux_read_watch_registers (long lwpid, + struct pt_watch_regs *watch_readback, + int *watch_readback_valid, int force) +{ + if (force || *watch_readback_valid == 0) + { + if (ptrace (PTRACE_GET_WATCH_REGS, lwpid, watch_readback) == -1) + { + *watch_readback_valid = -1; + return 0; + } + switch (watch_readback->style) + { + case pt_watch_style_mips32: + if (watch_readback->mips32.num_valid == 0) + { + *watch_readback_valid = -1; + return 0; + } + break; + case pt_watch_style_mips64: + if (watch_readback->mips64.num_valid == 0) + { + *watch_readback_valid = -1; + return 0; + } + break; + default: + *watch_readback_valid = -1; + return 0; + } + /* Watch registers appear to be usable. */ + *watch_readback_valid = 1; + } + return (*watch_readback_valid == 1) ? 1 : 0; +} + +/* Convert GDB's TYPE to an IRW mask. */ + +uint32_t +mips_linux_watch_type_to_irw (int type) +{ + switch (type) + { + case hw_write: + return W_MASK; + case hw_read: + return R_MASK; + case hw_access: + return (W_MASK | R_MASK); + default: + return 0; + } +} + +/* Set any low order bits in MASK that are not set. */ + +static CORE_ADDR +fill_mask (CORE_ADDR mask) +{ + CORE_ADDR f = 1; + + while (f && f < mask) + { + mask |= f; + f <<= 1; + } + return mask; +} + +/* Try to add a single watch to the specified registers REGS. The + address of added watch is ADDR, the length is LEN, and the mask + is IRW. Return 1 on success, 0 on failure. */ + +int +mips_linux_watch_try_one_watch (struct pt_watch_regs *regs, + CORE_ADDR addr, int len, uint32_t irw) +{ + CORE_ADDR base_addr, last_byte, break_addr, segment_len; + CORE_ADDR mask_bits, t_low; + uint16_t t_hi; + int i, free_watches; + struct pt_watch_regs regs_copy; + + if (len <= 0) + return 0; + + last_byte = addr + len - 1; + mask_bits = fill_mask (addr ^ last_byte) | IRW_MASK; + base_addr = addr & ~mask_bits; + + /* Check to see if it is covered by current registers. */ + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + t_low = mips_linux_watch_get_watchlo (regs, i); + if (t_low != 0 && irw == ((uint32_t) t_low & irw)) + { + t_hi = mips_linux_watch_get_watchhi (regs, i) | IRW_MASK; + t_low &= ~(CORE_ADDR) t_hi; + if (addr >= t_low && last_byte <= (t_low + t_hi)) + return 1; + } + } + /* Try to find an empty register. */ + free_watches = 0; + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + t_low = mips_linux_watch_get_watchlo (regs, i); + if (t_low == 0 + && irw == (mips_linux_watch_get_irw_mask (regs, i) & irw)) + { + if (mask_bits <= (get_reg_mask (regs, i) | IRW_MASK)) + { + /* It fits, we'll take it. */ + mips_linux_watch_set_watchlo (regs, i, base_addr | irw); + mips_linux_watch_set_watchhi (regs, i, mask_bits & ~IRW_MASK); + return 1; + } + else + { + /* It doesn't fit, but has the proper IRW capabilities. */ + free_watches++; + } + } + } + if (free_watches > 1) + { + /* Try to split it across several registers. */ + regs_copy = *regs; + for (i = 0; i < mips_linux_watch_get_num_valid (®s_copy); i++) + { + t_low = mips_linux_watch_get_watchlo (®s_copy, i); + t_hi = get_reg_mask (®s_copy, i) | IRW_MASK; + if (t_low == 0 && irw == (t_hi & irw)) + { + t_low = addr & ~(CORE_ADDR) t_hi; + break_addr = t_low + t_hi + 1; + if (break_addr >= addr + len) + segment_len = len; + else + segment_len = break_addr - addr; + mask_bits = fill_mask (addr ^ (addr + segment_len - 1)); + mips_linux_watch_set_watchlo (®s_copy, i, + (addr & ~mask_bits) | irw); + mips_linux_watch_set_watchhi (®s_copy, i, + mask_bits & ~IRW_MASK); + if (break_addr >= addr + len) + { + *regs = regs_copy; + return 1; + } + len = addr + len - break_addr; + addr = break_addr; + } + } + } + /* It didn't fit anywhere, we failed. */ + return 0; +} + +/* Fill in the watch registers REGS with the currently cached + watches CURRENT_WATCHES. */ + +void +mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches, + struct pt_watch_regs *regs) +{ + struct mips_watchpoint *w; + int i; + + /* Clear them out. */ + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + mips_linux_watch_set_watchlo (regs, i, 0); + mips_linux_watch_set_watchhi (regs, i, 0); + } + + w = current_watches; + while (w) + { + uint32_t irw = mips_linux_watch_type_to_irw (w->type); + + i = mips_linux_watch_try_one_watch (regs, w->addr, w->len, irw); + /* They must all fit, because we previously calculated that they + would. */ + gdb_assert (i); + w = w->next; + } +} diff --git a/gdb/nat/mips-linux-watch.h b/gdb/nat/mips-linux-watch.h new file mode 100644 index 0000000..c9f6932 --- /dev/null +++ b/gdb/nat/mips-linux-watch.h @@ -0,0 +1,126 @@ +/* Copyright (C) 2009-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef MIPS_LINUX_WATCH_H +#define MIPS_LINUX_WATCH_H 1 + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#endif + +#include +#include + +#include "break-common.h" + +#define MAX_DEBUG_REGISTER 8 + +/* If macro PTRACE_GET_WATCH_REGS is not defined, kernel header doesn't + have hardware watchpoint-related structures. Define them below. */ + +#ifndef PTRACE_GET_WATCH_REGS +# define PTRACE_GET_WATCH_REGS 0xd0 +# define PTRACE_SET_WATCH_REGS 0xd1 + +enum pt_watch_style { + pt_watch_style_mips32, + pt_watch_style_mips64 +}; + +/* A value of zero in a watchlo indicates that it is available. */ + +struct mips32_watch_regs +{ + uint32_t watchlo[MAX_DEBUG_REGISTER]; + /* Lower 16 bits of watchhi. */ + uint16_t watchhi[MAX_DEBUG_REGISTER]; + /* Valid mask and I R W bits. + * bit 0 -- 1 if W bit is usable. + * bit 1 -- 1 if R bit is usable. + * bit 2 -- 1 if I bit is usable. + * bits 3 - 11 -- Valid watchhi mask bits. + */ + uint16_t watch_masks[MAX_DEBUG_REGISTER]; + /* The number of valid watch register pairs. */ + uint32_t num_valid; + /* There is confusion across gcc versions about structure alignment, + so we force 8 byte alignment for these structures so they match + the kernel even if it was build with a different gcc version. */ +} __attribute__ ((aligned (8))); + +struct mips64_watch_regs +{ + uint64_t watchlo[MAX_DEBUG_REGISTER]; + uint16_t watchhi[MAX_DEBUG_REGISTER]; + uint16_t watch_masks[MAX_DEBUG_REGISTER]; + uint32_t num_valid; +} __attribute__ ((aligned (8))); + +struct pt_watch_regs +{ + enum pt_watch_style style; + union + { + struct mips32_watch_regs mips32; + struct mips64_watch_regs mips64; + }; +}; + +#endif /* !PTRACE_GET_WATCH_REGS */ + +#define W_BIT 0 +#define R_BIT 1 +#define I_BIT 2 + +#define W_MASK (1 << W_BIT) +#define R_MASK (1 << R_BIT) +#define I_MASK (1 << I_BIT) + +#define IRW_MASK (I_MASK | R_MASK | W_MASK) + +/* We keep list of all watchpoints we should install and calculate the + watch register values each time the list changes. This allows for + easy sharing of watch registers for more than one watchpoint. */ + +struct mips_watchpoint +{ + CORE_ADDR addr; + int len; + int type; + struct mips_watchpoint *next; +}; + +uint32_t mips_linux_watch_get_num_valid (struct pt_watch_regs *regs); +uint32_t mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n); +CORE_ADDR mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n); +void mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n, + CORE_ADDR value); +uint32_t mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n); +void mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n, + uint16_t value); +int mips_linux_watch_try_one_watch (struct pt_watch_regs *regs, + CORE_ADDR addr, int len, uint32_t irw); +void mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches, + struct pt_watch_regs *regs); +uint32_t mips_linux_watch_type_to_irw (int type); + +int mips_linux_read_watch_registers (long lwpid, + struct pt_watch_regs *watch_readback, + int *watch_readback_valid, int force); +#endif -- cgit v1.1