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Diffstat (limited to 'gdb/aix-thread.c')
| -rw-r--r-- | gdb/aix-thread.c | 1492 |
1 files changed, 1492 insertions, 0 deletions
diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c new file mode 100644 index 0000000..7ca8e82 --- /dev/null +++ b/gdb/aix-thread.c @@ -0,0 +1,1492 @@ +/* Low level interface for debugging AIX 4.3+ pthreads. + + Copyright 1999, 2000, 2002 Free Software Foundation, Inc. + Written by Nick Duffek <nsd@redhat.com>. + + 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + + +/* This module uses the libpthdebug.a library provided by AIX 4.3+ for + debugging pthread applications. + + Some name prefix conventions: + pthdb_ provided by libpthdebug.a + pdc_ callbacks that this module provides to libpthdebug.a + pd_ variables or functions interfacing with libpthdebug.a + + libpthdebug peculiarities: + + - pthdb_ptid_pthread() is prototyped in <sys/pthdebug.h>, but it's not + documented, and after several calls it stops working and causes other + libpthdebug functions to fail. + + - pthdb_tid_pthread() doesn't always work after pthdb_session_update(), + but it does work after cycling through all threads using + pthdb_pthread(). + + */ + +#include "defs.h" +#include "gdbthread.h" +#include "target.h" +#include "inferior.h" +#include "regcache.h" + +#if 0 +#include "coff/internal.h" /* for libcoff.h */ +#include "bfd/libcoff.h" /* for xcoff_data */ +#endif + +#include <procinfo.h> +#include <sys/types.h> +#include <sys/ptrace.h> +#include <sys/reg.h> +#if 0 +#include <pthread.h> +#endif +#include <sched.h> +#include <sys/pthdebug.h> + +/* Whether to emit debugging output. */ + +#define DEBUG 0 + +/* Default debugging output file, overridden by envvar UWTHR_DEBUG. */ + +#define DEBUG_FILE "/dev/tty" + +/* #if DEBUG, write string S to the debugging output channel. */ + +#if !DEBUG +# define DBG(fmt_and_args) +# define DBG2(fmt_and_args) +#else +# define DBG(fmt_and_args) dbg fmt_and_args +# define DBG2(fmt_and_args) dbg fmt_and_args +#endif + +/* in AIX 5.1, functions use pthdb_tid_t instead of tid_t */ +#ifndef PTHDB_VERSION_3 +#define pthdb_tid_t tid_t +#endif + +/* Return whether to treat PID as a debuggable thread id. */ + +#define PD_TID(ptid) (pd_active && ptid_get_tid (ptid) != 0) + +/* Build a thread ptid. */ +#define BUILD_THREAD(TID, PID) ptid_build (PID, 0, TID) + +/* Build and lwp ptid. */ +#define BUILD_LWP(LWP, PID) MERGEPID (PID, LWP) + +/* Call error() with a message indicating that libpthdebug FUNC failed with + STATUS. */ + +#define PD_ERROR(func, status) \ + error ("aix-thread: %s returned %s", func, pd_status2str (status)) + +/* pthdb_user_t value that we pass to pthdb functions. 0 causes + PTHDB_BAD_USER errors, so use 1. */ + +#define PD_USER 1 + +/* Success and failure values returned by pthdb callbacks. */ + +#define PDC_SUCCESS PTHDB_SUCCESS +#define PDC_FAILURE PTHDB_CALLBACK + +/* Convert composite process/thread inferior_ptid to a process id, evaluate + base_ops function CALL, and then restore inferior_ptid. */ + +#define CALL_BASE(call) \ + do { \ + struct cleanup *cleanup = save_inferior_ptid (); \ + inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); \ + call; \ + do_cleanups (cleanup); \ + } while (0) + +/* Private data attached to each element in GDB's thread list. */ + +struct private_thread_info { + pthdb_pthread_t pdtid; /* thread's libpthdebug id */ + pthdb_tid_t tid; /* kernel thread id */ +}; + +/* Information about a thread of which libpthdebug is aware. */ + +struct pd_thread { + pthdb_pthread_t pdtid; + pthread_t pthid; + pthdb_tid_t tid; +}; + +/* This module's target-specific operations, active while pd_able is true. */ + +static struct target_ops ops; + +/* Copy of the target over which ops is pushed. This is + more convenient than a pointer to child_ops or core_ops, because + they lack current_target's default callbacks. */ + +static struct target_ops base_ops; + +/* Address of the function that libpthread will call when libpthdebug is + ready to be initialized. */ + +static CORE_ADDR pd_brk_addr; + +/* Whether the current application is debuggable by pthdb. */ + +static int pd_able = 0; + +/* Whether a threaded application is being debugged. */ + +static int pd_active = 0; + +/* Whether the current architecture is 64-bit. Only valid when pd_able is + true. */ + +static int arch64; + +/* Saved pointer to previous owner of target_new_objfile_hook. */ + +static void (*target_new_objfile_chain)(struct objfile *); + +/* Forward declarations for pthdb callbacks. */ + +static int pdc_symbol_addrs (pthdb_user_t, pthdb_symbol_t *, int); +static int pdc_read_data (pthdb_user_t, void *, pthdb_addr_t, size_t); +static int pdc_write_data (pthdb_user_t, void *, pthdb_addr_t, size_t); +static int pdc_read_regs (pthdb_user_t user, pthdb_tid_t tid, + unsigned long long flags, pthdb_context_t *context); +static int pdc_write_regs (pthdb_user_t user, pthdb_tid_t tid, + unsigned long long flags, pthdb_context_t *context); +static int pdc_alloc (pthdb_user_t, size_t, void **); +static int pdc_realloc (pthdb_user_t, void *, size_t, void **); +static int pdc_dealloc (pthdb_user_t, void *); + +/* pthdb callbacks. */ + +static pthdb_callbacks_t pd_callbacks = { + pdc_symbol_addrs, + pdc_read_data, + pdc_write_data, + pdc_read_regs, + pdc_write_regs, + pdc_alloc, + pdc_realloc, + pdc_dealloc, + NULL +}; + +/* Current pthdb session. */ + +static pthdb_session_t pd_session; + +#if DEBUG +/* DBG() helper: if printf-style FMT is non-null, format it with args and + display the result on the debugging output channel. */ + +static void +dbg (char *fmt, ...) +{ + static int fd = -1, len; + va_list args; + char buf[1024]; + char *path; + + if (!fmt) + return; + + if (fd < 0) + { + path = getenv ("UWTHR_DEBUG"); + if (!path) + path = DEBUG_FILE; + if ((fd = open (path, O_WRONLY | O_CREAT | O_TRUNC, 0664)) < 0) + error ("can't open %s\n", path); + } + + va_start (args, fmt); + vsprintf (buf, fmt, args); + va_end (args); + + len = strlen (buf); + buf[len] = '\n'; + (void)write (fd, buf, len + 1); +} +#endif /* DEBUG */ + +/* Return a printable representation of pthdebug function return STATUS. */ + +static char * +pd_status2str (int status) +{ + switch (status) + { + case PTHDB_SUCCESS: return "SUCCESS"; + case PTHDB_NOSYS: return "NOSYS"; + case PTHDB_NOTSUP: return "NOTSUP"; + case PTHDB_BAD_VERSION: return "BAD_VERSION"; + case PTHDB_BAD_USER: return "BAD_USER"; + case PTHDB_BAD_SESSION: return "BAD_SESSION"; + case PTHDB_BAD_MODE: return "BAD_MODE"; + case PTHDB_BAD_FLAGS: return "BAD_FLAGS"; + case PTHDB_BAD_CALLBACK: return "BAD_CALLBACK"; + case PTHDB_BAD_POINTER: return "BAD_POINTER"; + case PTHDB_BAD_CMD: return "BAD_CMD"; + case PTHDB_BAD_PTHREAD: return "BAD_PTHREAD"; + case PTHDB_BAD_ATTR: return "BAD_ATTR"; + case PTHDB_BAD_MUTEX: return "BAD_MUTEX"; + case PTHDB_BAD_MUTEXATTR: return "BAD_MUTEXATTR"; + case PTHDB_BAD_COND: return "BAD_COND"; + case PTHDB_BAD_CONDATTR: return "BAD_CONDATTR"; + case PTHDB_BAD_RWLOCK: return "BAD_RWLOCK"; + case PTHDB_BAD_RWLOCKATTR: return "BAD_RWLOCKATTR"; + case PTHDB_BAD_KEY: return "BAD_KEY"; + case PTHDB_BAD_PTID: return "BAD_PTID"; + case PTHDB_BAD_TID: return "BAD_TID"; + case PTHDB_CALLBACK: return "CALLBACK"; + case PTHDB_CONTEXT: return "CONTEXT"; + case PTHDB_HELD: return "HELD"; + case PTHDB_NOT_HELD: return "NOT_HELD"; + case PTHDB_MEMORY: return "MEMORY"; + case PTHDB_NOT_PTHREADED: return "NOT_PTHREADED"; + case PTHDB_SYMBOL: return "SYMBOL"; + case PTHDB_NOT_AVAIL: return "NOT_AVAIL"; + case PTHDB_INTERNAL: return "INTERNAL"; + default: return "UNKNOWN"; + } +} + +/* A call to ptrace(REQ, ID, ...) just returned RET. Check for exceptional + conditions and either return nonlocally or else return 1 for success and 0 + for failure. */ + +static int +ptrace_check (int req, int id, int ret) +{ + if (ret == 0 && !errno) + return 1; + + /* According to ptrace(2), ptrace may fail with EPERM if "the Identifier + parameter corresponds to a kernel thread which is stopped in kernel mode + and whose computational state cannot be read or written." This happens + quite often with register reads. */ + + switch (req) + { + case PTT_READ_GPRS: + case PTT_READ_FPRS: + case PTT_READ_SPRS: + if (ret == -1 && errno == EPERM) + goto strange; + break; + } + error ("aix-thread: ptrace (%d, %d) returned %d (errno = %d %s)", + req, id, ret, errno, strerror (errno)); + + strange: + DBG2(("ptrace (%d, %d) = %d (errno = %d)", req, id, ret, errno)); + return ret == -1 ? 0 : 1; +} + +/* Call ptracex(REQ, ID, ADDR, DATA, BUF). Return success. */ + +static int +ptrace64aix (int req, int id, long long addr, int data, int *buf) +{ + errno = 0; + return ptrace_check (req, id, ptracex (req, id, addr, data, buf)); +} + +/* Call ptrace(REQ, ID, ADDR, DATA, BUF). Return success. */ + +static int +ptrace32 (int req, int id, int *addr, int data, int *buf) +{ + errno = 0; + return ptrace_check (req, id, ptrace (req, id, (int *)addr, data, buf)); +} + +/* If *PIDP is a composite process/thread id, convert it to a process id. */ + +static void +pid_to_prc (ptid_t *ptidp) +{ + ptid_t ptid; + + ptid = *ptidp; + if (PD_TID (ptid)) + *ptidp = pid_to_ptid (PIDGET (ptid)); +} + +/* pthdb callback: for <i> from 0 to COUNT, set SYMBOLS[<i>].addr to the + address of SYMBOLS[<i>].name. */ + +static int +pdc_symbol_addrs (pthdb_user_t user, pthdb_symbol_t *symbols, int count) +{ + struct minimal_symbol *ms; + int i; + char *name; + + DBG2(("pdc_symbol_addrs (user = %ld, symbols = 0x%x, count = %d)", + user, symbols, count)); + + for (i = 0; i < count; i++) + { + name = symbols[i].name; + DBG2((" symbols[%d].name = \"%s\"", i, name)); + + if (!*name) + symbols[i].addr = 0; + else + { + if (!(ms = lookup_minimal_symbol (name, NULL, NULL))) + { + DBG2((" returning PDC_FAILURE")); + return PDC_FAILURE; + } + symbols[i].addr = SYMBOL_VALUE_ADDRESS (ms); + } + DBG2((" symbols[%d].addr = 0x%llx", i, symbols[i].addr)); + } + DBG2((" returning PDC_SUCCESS")); + return PDC_SUCCESS; +} + +/* Read registers call back function should be able to read the context */ +/* information of a debuggee kernel thread from an active process or from */ +/* a core file. The information should be formatted in context64 form for */ +/* both 32-bit and 64-bit process. If successful return 0, else non-zero */ +/* is returned. */ +static int +pdc_read_regs (pthdb_user_t user, + pthdb_tid_t tid, + unsigned long long flags, + pthdb_context_t *context) +{ + /* this function doesn't appear to be used, so we could probably just */ + /* return 0 here. HOWEVER, if it is not defined, the OS will complain */ + /* and several thread debug functions will fail. In case this is needed, */ + /* I have implemented what I think it should do, however this code is */ + /* untested. */ + uint64_t gprs64[32]; + uint32_t gprs32[32]; + double fprs[32]; + struct ptxsprs sprs64; + struct ptsprs sprs32; + + DBG2(("pdc_read_regs tid=%d flags=%llx\n", (int)tid, flags)); + + /* General-purpose registers. */ + if (flags & PTHDB_FLAG_GPRS) + { + if (arch64) + { + if (!ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL)) + memset (gprs64, 0, sizeof (gprs64)); + memcpy (context->gpr, gprs64, sizeof(gprs64)); + } + else + { + if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) + memset (gprs32, 0, sizeof (gprs32)); + memcpy (context->gpr, gprs32, sizeof(gprs32)); + } + } + + /* Floating-point registers. */ + if (flags & PTHDB_FLAG_FPRS) + { + if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) + memset (fprs, 0, sizeof (fprs)); + memcpy (context->fpr, fprs, sizeof(fprs)); + } + + /* Special-purpose registers. */ + if (flags & PTHDB_FLAG_SPRS) + { + if (arch64) + { + if (!ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL)) + memset (&sprs64, 0, sizeof (sprs64)); + memcpy (&context->msr, &sprs64, sizeof(sprs64)); + } + else + { + if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) + memset (&sprs32, 0, sizeof (sprs32)); + memcpy (&context->msr, &sprs32, sizeof(sprs32)); + } + } + return 0; +} + +/* Write register function should be able to write requested context */ +/* information to specified debuggee's kernel thread id. If successful */ +/* return 0, else non-zero is returned. */ +static int +pdc_write_regs (pthdb_user_t user, + pthdb_tid_t tid, + unsigned long long flags, + pthdb_context_t *context) +{ + /* this function doesn't appear to be used, so we could probably just */ + /* return 0 here. HOWEVER, if it is not defined, the OS will complain */ + /* and several thread debug functions will fail. In case this is needed, */ + /* I have implemented what I think it should do, however this code is */ + /* untested. */ + + DBG2(("pdc_write_regs tid=%d flags=%llx\n", (int)tid, flags)); + + /* General-purpose registers. */ + if (flags & PTHDB_FLAG_GPRS) + { + if (arch64) + ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long)context->gpr, 0, NULL); + else + ptrace32 (PTT_WRITE_GPRS, tid, (int *)context->gpr, 0, NULL); + } + + /* Floating-point registers. */ + if (flags & PTHDB_FLAG_FPRS) + { + ptrace32 (PTT_WRITE_FPRS, tid, (int *)context->fpr, 0, NULL); + } + + /* Special-purpose registers. */ + if (flags & PTHDB_FLAG_SPRS) + { + if (arch64) + { + ptrace64aix (PTT_WRITE_SPRS, tid, (unsigned long) &context->msr, 0, NULL); + } + else + { + ptrace32 (PTT_WRITE_SPRS, tid, (int *)&context->msr, 0, NULL); + } + } + return 0; +} + +/* pthdb callback: read LEN bytes from process ADDR into BUF. */ + +static int +pdc_read_data (pthdb_user_t user, void *buf, pthdb_addr_t addr, size_t len) +{ + int status, ret; + + DBG2(("pdc_read_data (user = %ld, buf = 0x%x, addr = 0x%llx, len = %d)", + user, buf, addr, len)); + + status = target_read_memory (addr, buf, len); + ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; + + DBG2((" status=%d, returning %s", status, pd_status2str (ret))); + return ret; +} + +/* pthdb callback: write LEN bytes from BUF to process ADDR. */ + +static int +pdc_write_data (pthdb_user_t user, void *buf, pthdb_addr_t addr, size_t len) +{ + int status, ret; + + DBG2(("pdc_write_data (user = %ld, buf = 0x%x, addr = 0x%llx, len = %d)", + user, buf, addr, len)); + + status = target_write_memory (addr, buf, len); + ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; + + DBG2((" status=%d, returning %s", status, pd_status2str (ret))); + return ret; +} + +/* pthdb callback: allocate a LEN-byte buffer and store a pointer to it in + BUFP. */ + +static int +pdc_alloc (pthdb_user_t user, size_t len, void **bufp) +{ + DBG2(("pdc_alloc (user = %ld, len = %d, bufp = 0x%x)", user, len, bufp)); + *bufp = xmalloc (len); + DBG2((" malloc returned 0x%x", *bufp)); + /* Note: xmalloc() can't return 0; therefore PDC_FAILURE will never be + returned. */ + return *bufp ? PDC_SUCCESS : PDC_FAILURE; +} + +/* pthdb callback: reallocate BUF, which was allocated by the alloc or realloc + callback, so that it contains LEN bytes, and store a pointer to the result + in BUFP. */ + +static int +pdc_realloc (pthdb_user_t user, void *buf, size_t len, void **bufp) +{ + DBG2(("pdc_realloc (user = %ld, buf = 0x%x, len = %d, bufp = 0x%x)", + user, buf, len, bufp)); + *bufp = realloc (buf, len); + DBG2((" realloc returned 0x%x", *bufp)); + return *bufp ? PDC_SUCCESS : PDC_FAILURE; +} + +/* pthdb callback: free BUF, which was allocated by the alloc or realloc + callback. */ + +static int +pdc_dealloc (pthdb_user_t user, void *buf) +{ + DBG2(("pdc_free (user = %ld, buf = 0x%x)", user, buf)); + xfree (buf); + return PDC_SUCCESS; +} + +/* Return a printable representation of pthread STATE. */ + +static char * +state2str (pthdb_state_t state) +{ + switch (state) + { + case PST_IDLE: return "idle"; /* being created */ + case PST_RUN: return "running"; /* running */ + case PST_SLEEP: return "sleeping"; /* awaiting an event */ + case PST_READY: return "ready"; /* runnable */ + case PST_TERM: return "finished"; /* awaiting a join/detach */ + default: return "unknown"; + } +} + +/* qsort() comparison function for sorting pd_thread structs by pthid. */ + +static int +pcmp (const void *p1v, const void *p2v) +{ + struct pd_thread *p1 = (struct pd_thread *) p1v; + struct pd_thread *p2 = (struct pd_thread *) p2v; + return p1->pthid < p2->pthid ? -1 : p1->pthid > p2->pthid; +} + +/* iterate_over_threads() callback for counting GDB threads. */ + +static int +giter_count (struct thread_info *thread, void *countp) +{ + (*(int *) countp)++; + return 0; +} + +/* iterate_over_threads() callback for accumulating GDB thread pids. */ + +static int +giter_accum (struct thread_info *thread, void *bufp) +{ + **(struct thread_info ***) bufp = thread; + (*(struct thread_info ***) bufp)++; + return 0; +} + +/* ptid comparison function */ +static int +ptid_cmp (ptid_t ptid1, ptid_t ptid2) +{ + int pid1, pid2; + + if (ptid_get_pid (ptid1) < ptid_get_pid (ptid2)) + return -1; + else if (ptid_get_pid (ptid1) > ptid_get_pid (ptid2)) + return 1; + else if (ptid_get_tid (ptid1) < ptid_get_tid (ptid2)) + return -1; + else if (ptid_get_tid (ptid1) > ptid_get_tid (ptid2)) + return 1; + else if (ptid_get_lwp (ptid1) < ptid_get_lwp (ptid2)) + return -1; + else if (ptid_get_lwp (ptid1) > ptid_get_lwp (ptid2)) + return 1; + else + return 0; +} + +/* qsort() comparison function for sorting thread_info structs by pid. */ + +static int +gcmp (const void *t1v, const void *t2v) +{ + struct thread_info *t1 = *(struct thread_info **) t1v; + struct thread_info *t2 = *(struct thread_info **) t2v; + return ptid_cmp (t1->ptid, t2->ptid); +} + +/* Synchronize GDB's thread list with libpthdebug's. + + There are some benefits of doing this every time the inferior stops: + + - allows users to run thread-specific commands without needing to run + "info threads" first + + - helps pthdb_tid_pthread() work properly (see "libpthdebug + peculiarities" at the top of this module) + + - simplifies the demands placed on libpthdebug, which seems to have + difficulty with certain call patterns */ + +static void +sync_threadlists (void) +{ + int cmd, status, infpid; + int pcount, psize, pi, gcount, gi; + struct pd_thread *pbuf; + struct thread_info **gbuf, **g, *thread; + pthdb_pthread_t pdtid; + pthread_t pthid; + pthdb_tid_t tid; + ptid_t pptid, gptid; + + /* Accumulate an array of libpthdebug threads sorted by pthread id. */ + + pcount = 0; + psize = 1; + pbuf = (struct pd_thread *) xmalloc (psize * sizeof *pbuf); + + for (cmd = PTHDB_LIST_FIRST;; cmd = PTHDB_LIST_NEXT) + { + status = pthdb_pthread (pd_session, &pdtid, cmd); + if (status != PTHDB_SUCCESS || pdtid == PTHDB_INVALID_PTHREAD) + break; + + status = pthdb_pthread_ptid (pd_session, pdtid, &pthid); + if (status != PTHDB_SUCCESS || pthid == PTHDB_INVALID_PTID) + continue; + + if (pcount == psize) + { + psize *= 2; + pbuf = (struct pd_thread *) xrealloc (pbuf, psize * sizeof *pbuf); + } + pbuf[pcount].pdtid = pdtid; + pbuf[pcount].pthid = pthid; + pcount++; + } + + for (pi = 0; pi < pcount; pi++) + { + status = pthdb_pthread_tid (pd_session, pbuf[pi].pdtid, &tid); + if (status != PTHDB_SUCCESS) + tid = PTHDB_INVALID_TID; + pbuf[pi].tid = tid; + } + + qsort (pbuf, pcount, sizeof *pbuf, pcmp); + + /* Accumulate an array of GDB threads sorted by pid. */ + + gcount = 0; + iterate_over_threads (giter_count, &gcount); + g = gbuf = (struct thread_info **) xmalloc (gcount * sizeof *gbuf); + iterate_over_threads (giter_accum, &g); + qsort (gbuf, gcount, sizeof *gbuf, gcmp); + + /* Apply differences between the two arrays to GDB's thread list. */ + + infpid = PIDGET (inferior_ptid); + for (pi = gi = 0; pi < pcount || gi < gcount;) + { + pptid = BUILD_THREAD (pbuf[pi].pthid, infpid); + gptid = gbuf[gi]->ptid; + pdtid = pbuf[pi].pdtid; + tid = pbuf[pi].tid; + + if (pi == pcount) + goto del; + if (gi == gcount) + goto add; + + if (ptid_equal (pptid, gptid)) + { + gbuf[gi]->private->pdtid = pdtid; + gbuf[gi]->private->tid = tid; + pi++; + gi++; + } + else if (ptid_cmp (pptid, gptid) > 0) + { + del: + delete_thread (gptid); + gi++; + } + else + { + add: + thread = add_thread (pptid); + thread->private = xmalloc (sizeof (struct private_thread_info)); + thread->private->pdtid = pdtid; + thread->private->tid = tid; + pi++; + } + + } + + xfree (pbuf); + xfree (gbuf); +} + +/* iterate_over_threads() callback for locating a thread whose kernel thread + just received a trap signal. */ + +static int +iter_trap (struct thread_info *thread, void *unused) +{ + struct thrdsinfo64 thrinf; + pthdb_tid_t tid; + + /* getthrds(3) isn't prototyped in any AIX 4.3.3 #include file. */ + extern int getthrds (pid_t, struct thrdsinfo64 *, int, pthdb_tid_t *, int); + + tid = thread->private->tid; + if (tid == PTHDB_INVALID_TID) + return 0; + + if (getthrds (PIDGET (inferior_ptid), &thrinf, sizeof (thrinf), &tid, 1) != 1) + return 0; + + return thrinf.ti_cursig == SIGTRAP; +} + +/* Synchronize libpthdebug's state with the inferior and with GDB, generate a + composite process/thread <pid> for the current thread, set inferior_ptid to + <pid> if SET_INFPID, and return <pid>. */ + +static ptid_t +pd_update (int set_infpid) +{ + int status; + ptid_t ptid; + struct thread_info *thread; + + if (!pd_active) + return inferior_ptid; + + status = pthdb_session_update (pd_session); + if (status != PTHDB_SUCCESS) + return inferior_ptid; + + sync_threadlists (); + + /* Define "current thread" as one that just received a trap signal. */ + + thread = iterate_over_threads (iter_trap, NULL); + if (!thread) + ptid = inferior_ptid; + else + { + ptid = thread->ptid; + if (set_infpid) + inferior_ptid = ptid; + } + return ptid; +} + +/* Try to start debugging threads in the current process. If successful and + SET_INFPID, set inferior_ptid to reflect the current thread. */ + +static ptid_t +pd_activate (int set_infpid) +{ + int status; + + status = pthdb_session_init (PD_USER, arch64 ? PEM_64BIT : PEM_32BIT, + PTHDB_FLAG_REGS, &pd_callbacks, &pd_session); + if (status != PTHDB_SUCCESS) + { + return inferior_ptid; + } + pd_active = 1; + return pd_update (set_infpid); +} + +/* Undo the effects of pd_activate(). */ + +static void +pd_deactivate (void) +{ + if (!pd_active) + return; + pthdb_session_destroy (pd_session); + + pid_to_prc (&inferior_ptid); + pd_active = 0; +} + +/* An object file has just been loaded. Check whether the current application + is pthreaded, and if so, prepare for thread debugging. */ + +static void +pd_enable (void) +{ + int status; + char *stub_name; + struct minimal_symbol *ms; + + /* Don't initialize twice. */ + if (pd_able) + return; + + /* Check application word size. */ + arch64 = REGISTER_RAW_SIZE (0) == 8; + + /* Check whether the application is pthreaded. */ + stub_name = NULL; + status = pthdb_session_pthreaded (PD_USER, PTHDB_FLAG_REGS, &pd_callbacks, + &stub_name); + if ((status != PTHDB_SUCCESS && status != PTHDB_NOT_PTHREADED) || !stub_name) + return; + + /* Set a breakpoint on the returned stub function. */ + if (!(ms = lookup_minimal_symbol (stub_name, NULL, NULL))) + return; + pd_brk_addr = SYMBOL_VALUE_ADDRESS (ms); + if (!create_thread_event_breakpoint (pd_brk_addr)) + return; + + /* Prepare for thread debugging. */ + base_ops = current_target; + push_target (&ops); + pd_able = 1; + + /* If we're debugging a core file or an attached inferior, the pthread + library may already have been initialized, so try to activate thread + debugging. */ + pd_activate (1); +} + +/* Undo the effects of pd_enable(). */ + +static void +pd_disable (void) +{ + if (!pd_able) + return; + if (pd_active) + pd_deactivate (); + pd_able = 0; + unpush_target (&ops); +} + +/* target_new_objfile_hook callback. + + If OBJFILE is non-null, check whether a threaded application is being + debugged, and if so, prepare for thread debugging. + + If OBJFILE is null, stop debugging threads. */ + +static void +new_objfile (struct objfile *objfile) +{ + if (objfile) + pd_enable (); + else + pd_disable (); + + if (target_new_objfile_chain) + target_new_objfile_chain (objfile); +} + +/* Attach to process specified by ARGS. */ + +static void +ops_attach (char *args, int from_tty) +{ + base_ops.to_attach (args, from_tty); + pd_activate (1); +} + +/* Detach from the process attached to by ops_attach(). */ + +static void +ops_detach (char *args, int from_tty) +{ + pd_deactivate (); + base_ops.to_detach (args, from_tty); +} + +/* Tell the inferior process to continue running thread PID if != -1 + and all threads otherwise. */ + +static void +ops_resume (ptid_t ptid, int step, enum target_signal sig) +{ + struct thread_info *thread; + pthdb_tid_t tid[2]; + + if (!PD_TID (ptid)) + CALL_BASE (base_ops.to_resume (ptid, step, sig)); + else + { + thread = find_thread_pid (ptid); + if (!thread) + error ("aix-thread resume: unknown pthread %ld", TIDGET (ptid)); + + tid[0] = thread->private->tid; + if (tid[0] == PTHDB_INVALID_TID) + error ("aix-thread resume: no tid for pthread %ld", TIDGET (ptid)); + tid[1] = 0; + + if (arch64) + ptrace64aix (PTT_CONTINUE, tid[0], 1, target_signal_to_host (sig), (int *)tid); + else + ptrace32 (PTT_CONTINUE, tid[0], (int *) 1, + target_signal_to_host (sig), (int *)tid); + } +} + +/* Wait for thread/process ID if != -1 or for any thread otherwise. If an + error occurs, return -1, else return the pid of the stopped thread. */ + +static ptid_t +ops_wait (ptid_t ptid, struct target_waitstatus *status) +{ + pid_to_prc (&ptid); + CALL_BASE (ptid = base_ops.to_wait (ptid, status)); + if (PIDGET (ptid) == -1) + return pid_to_ptid (-1); + + /* Check whether libpthdebug might be ready to be initialized. */ + if (!pd_active && status->kind == TARGET_WAITKIND_STOPPED && + status->value.sig == TARGET_SIGNAL_TRAP && + read_pc_pid (ptid) - DECR_PC_AFTER_BREAK == pd_brk_addr) + return pd_activate (0); + + return pd_update (0); +} + +/* Record that the 64-bit general-purpose registers contain VALS. */ + +static void +supply_gprs64 (uint64_t *vals) +{ + int regno; + + for (regno = 0; regno < 32; regno++) + supply_register (regno, (char *) (vals + regno)); +} + +/* Record that 32-bit register REGNO contains VAL. */ + +static void +supply_reg32 (int regno, uint32_t val) +{ + supply_register (regno, (char *) &val); +} + +/* Record that the floating-point registers contain VALS. */ + +static void +supply_fprs (double *vals) +{ + int regno; + + for (regno = 0; regno < 32; regno++) + supply_register (regno + FP0_REGNUM, (char *) (vals + regno)); +} + +/* Record that the special registers contain the specified 64-bit and 32-bit + values. */ + +static void +supply_sprs64 (uint64_t iar, uint64_t msr, uint32_t cr, + uint64_t lr, uint64_t ctr, uint32_t xer) +{ + int regno = FIRST_UISA_SP_REGNUM; + supply_register (regno, (char *) &iar); + supply_register (regno + 1, (char *) &msr); + supply_register (regno + 2, (char *) &cr); + supply_register (regno + 3, (char *) &lr); + supply_register (regno + 4, (char *) &ctr); + supply_register (regno + 5, (char *) &xer); +} + +/* Record that the special registers contain the specified 32-bit values. */ + +static void +supply_sprs32 (uint32_t iar, uint32_t msr, uint32_t cr, + uint32_t lr, uint32_t ctr, uint32_t xer) +{ + int regno = FIRST_UISA_SP_REGNUM; + supply_register (regno, (char *) &iar); + supply_register (regno + 1, (char *) &msr); + supply_register (regno + 2, (char *) &cr); + supply_register (regno + 3, (char *) &lr); + supply_register (regno + 4, (char *) &ctr); + supply_register (regno + 5, (char *) &xer); +} + +/* Fetch all registers from pthread PDTID, which doesn't have a kernel + thread. + + There's no way to query a single register from a non-kernel pthread, + so there's no need for a single-register version of this function. */ + +static void +fetch_regs_lib (pthdb_pthread_t pdtid) +{ + int status, i; + pthdb_context_t ctx; + + DBG2 (("fetch_regs_lib %lx\n", (long)pdtid)); + status = pthdb_pthread_context (pd_session, pdtid, &ctx); + if (status != PTHDB_SUCCESS) + PD_ERROR ("fetch_registers: pthdb_pthread_context", status); + + /* General-purpose registers. */ + + if (arch64) + supply_gprs64 (ctx.gpr); + else + for (i = 0; i < 32; i++) + supply_reg32 (i, ctx.gpr[i]); + + /* Floating-point registers. */ + + supply_fprs (ctx.fpr); + + /* Special registers. */ + + if (arch64) + supply_sprs64 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); + else + supply_sprs32 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); +} + +/* Fetch register REGNO if != -1 or all registers otherwise from kernel thread + TID. + + AIX provides a way to query all of a kernel thread's GPRs, FPRs, or SPRs, + but there's no way to query individual registers within those groups. + Therefore, if REGNO != -1, this function fetches an entire group. + + Unfortunately, kernel thread register queries often fail with EPERM, + indicating that the thread is in kernel space. This breaks backtraces of + threads other than the current one. To make that breakage obvious without + throwing an error to top level (which is bad e.g. during "info threads" + output), zero registers that can't be retrieved. */ + +static void +fetch_regs_kern (int regno, pthdb_tid_t tid) +{ + uint64_t gprs64[32]; + uint32_t gprs32[32]; + double fprs[32]; + struct ptxsprs sprs64; + struct ptsprs sprs32; + int i; + + DBG2 (("fetch_regs_kern tid=%lx regno=%d arch64=%d\n", (long)tid, regno, arch64)); + + /* General-purpose registers. */ + if (regno == -1 || regno < FP0_REGNUM) + { + if (arch64) + { + if (!ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL)) + memset (gprs64, 0, sizeof (gprs64)); + supply_gprs64 (gprs64); + } + else + { + if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) + memset (gprs32, 0, sizeof (gprs32)); + for (i = 0; i < 32; i++) + supply_reg32 (i, gprs32[i]); + } + } + + /* Floating-point registers. */ + + if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) + { + if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) + memset (fprs, 0, sizeof (fprs)); + supply_fprs (fprs); + } + + /* Special-purpose registers. */ + + if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) + { + if (arch64) + { + if (!ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL)) + memset (&sprs64, 0, sizeof (sprs64)); + supply_sprs64 (sprs64.pt_iar, sprs64.pt_msr, sprs64.pt_cr, + sprs64.pt_lr, sprs64.pt_ctr, sprs64.pt_xer); + } + else + { + if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) + memset (&sprs32, 0, sizeof (sprs32)); + supply_sprs32 (sprs32.pt_iar, sprs32.pt_msr, sprs32.pt_cr, + sprs32.pt_lr, sprs32.pt_ctr, sprs32.pt_xer); + + if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) + supply_register (LAST_UISA_SP_REGNUM, (char *) &sprs32.pt_mq); + } + } +} + +/* Fetch register REGNO if != -1 or all registers otherwise in the + thread/process specified by inferior_ptid. */ + +static void +ops_fetch_registers (int regno) +{ + struct thread_info *thread; + pthdb_tid_t tid; + + if (!PD_TID (inferior_ptid)) + base_ops.to_fetch_registers (regno); + else + { + thread = find_thread_pid (inferior_ptid); + tid = thread->private->tid; + + if (tid == PTHDB_INVALID_TID) + fetch_regs_lib (thread->private->pdtid); + else + fetch_regs_kern (regno, tid); + } +} + +/* Store the special registers into the specified 64-bit and 32-bit + locations. */ + +static void +fill_sprs64 (uint64_t *iar, uint64_t *msr, uint32_t *cr, + uint64_t *lr, uint64_t *ctr, uint32_t *xer) +{ + int regno = FIRST_UISA_SP_REGNUM; + *iar = read_register (regno); + *msr = read_register (regno + 1); + *cr = read_register (regno + 2); + *lr = read_register (regno + 3); + *ctr = read_register (regno + 4); + *xer = read_register (regno + 5); +} + +/* Store all registers into pthread PDTID, which doesn't have a kernel + thread. + + It's possible to store a single register into a non-kernel pthread, but I + doubt it's worth the effort. */ + +static void +store_regs_lib (pthdb_pthread_t pdtid) +{ + int status, i; + pthdb_context_t ctx; + + DBG2 (("store_regs_lib %lx\n", (long)pdtid)); + + /* Retrieve the thread's current context for its non-register values. */ + status = pthdb_pthread_context (pd_session, pdtid, &ctx); + if (status != PTHDB_SUCCESS) + PD_ERROR ("store_registers: pthdb_pthread_context", status); + + /* General-purpose registers. */ + + for (i = 0; i < 32; i++) + ctx.gpr[i] = read_register (i); + + /* Floating-point registers. */ + + for (i = 0; i < 32; i++) + ctx.fpr[i] = *(double *) ®isters[REGISTER_BYTE (FP0_REGNUM + i)]; + + /* Special registers. */ + + fill_sprs64 (&ctx.iar, &ctx.msr, &ctx.cr, &ctx.lr, &ctx.ctr, &ctx.xer); + + status = pthdb_pthread_setcontext (pd_session, pdtid, &ctx); + if (status != PTHDB_SUCCESS) + PD_ERROR ("store_registers: pthdb_pthread_setcontext", status); +} + +/* Store register REGNO if != -1 or all registers otherwise into kernel + thread TID. + + AIX provides a way to set all of a kernel thread's GPRs, FPRs, or SPRs, but + there's no way to set individual registers within those groups. Therefore, + if REGNO != -1, this function stores an entire group. */ + +static void +store_regs_kern (int regno, pthdb_tid_t tid) +{ + struct ptxsprs sprs64; + struct ptsprs sprs32; + char *regp; + + DBG2 (("store_regs_kern tid=%lx regno=%d\n", (long)tid, regno)); + + /* General-purpose registers. */ + if (regno == -1 || regno < FP0_REGNUM) + { + regp = ®isters[REGISTER_BYTE (0)]; + if (arch64) + ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long) regp, 0, NULL); + else + ptrace32 (PTT_WRITE_GPRS, tid, (int *) regp, 0, NULL); + } + + /* Floating-point registers. */ + + if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) + { + regp = ®isters[REGISTER_BYTE (FP0_REGNUM)]; + ptrace32 (PTT_WRITE_FPRS, tid, (int *) regp, 0, NULL); + } + + /* Special-purpose registers. */ + + if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) + { + if (arch64) + { + ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL); + fill_sprs64 (&sprs64.pt_iar, &sprs64.pt_msr, &sprs64.pt_cr, + &sprs64.pt_lr, &sprs64.pt_ctr, &sprs64.pt_xer); + ptrace64aix (PTT_WRITE_SPRS, tid, (unsigned long) &sprs64, 0, NULL); + } + else + { + ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL); + + regno = FIRST_UISA_SP_REGNUM; + sprs32.pt_iar = read_register (regno); + sprs32.pt_msr = read_register (regno + 1); + sprs32.pt_cr = read_register (regno + 2); + sprs32.pt_lr = read_register (regno + 3); + sprs32.pt_ctr = read_register (regno + 4); + sprs32.pt_xer = read_register (regno + 5); + + if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) + sprs32.pt_mq = read_register (LAST_UISA_SP_REGNUM); + + ptrace32 (PTT_WRITE_SPRS, tid, (int *) &sprs32, 0, NULL); + } + } +} + +/* Store gdb's current view of the register set into the thread/process + specified by inferior_ptid. */ + +static void +ops_store_registers (int regno) +{ + struct thread_info *thread; + pthdb_tid_t tid; + + if (!PD_TID (inferior_ptid)) + base_ops.to_store_registers (regno); + else + { + thread = find_thread_pid (inferior_ptid); + tid = thread->private->tid; + + if (tid == PTHDB_INVALID_TID) + store_regs_lib (thread->private->pdtid); + else + store_regs_kern (regno, tid); + } +} + +/* Prepare to modify the registers array. */ + +static void +ops_prepare_to_store (void) +{ + if (!PD_TID (inferior_ptid)) + base_ops.to_prepare_to_store (); + else + read_register_bytes (0, NULL, REGISTER_BYTES); +} + +/* Transfer LEN bytes of memory from GDB address MYADDR to target address + MEMADDR if WRITE and vice versa otherwise. */ + +static int +ops_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, + struct mem_attrib *attrib, + struct target_ops *target) +{ + int n; + + CALL_BASE (n = base_ops.to_xfer_memory (memaddr, myaddr, len, write, + attrib, &base_ops)); + return n; +} + +/* Kill and forget about the inferior process. */ + +static void +ops_kill (void) +{ + CALL_BASE (base_ops.to_kill ()); +} + +/* Clean up after the inferior exits. */ + +static void +ops_mourn_inferior (void) +{ + pd_deactivate (); + base_ops.to_mourn_inferior (); +} + +/* Return whether thread PID is still valid. */ + +static int +ops_thread_alive (ptid_t ptid) +{ + if (!PD_TID (ptid)) + return base_ops.to_thread_alive (ptid); + + /* We update the thread list every time the child stops, so all valid + threads should be in the thread list. */ + return in_thread_list (ptid); +} + +/* Return a printable representation of composite PID for use in "info + threads" output. */ + +static char * +ops_pid_to_str (ptid_t ptid) +{ + static char *ret = NULL; + + if (!PD_TID (ptid)) + return base_ops.to_pid_to_str (ptid); + + /* Free previous return value; a new one will be allocated by + xasprintf(). */ + xfree (ret); + + xasprintf (&ret, "Thread %ld", ptid_get_tid (ptid)); + return ret; +} + +/* Return a printable representation of extra information about THREAD, for + use in "info threads" output. */ + +static char * +ops_extra_thread_info (struct thread_info *thread) +{ + struct ui_file *buf; + int status; + pthdb_pthread_t pdtid; + pthdb_tid_t tid; + pthdb_state_t state; + pthdb_suspendstate_t suspendstate; + pthdb_detachstate_t detachstate; + int cancelpend; + long length; + static char *ret = NULL; + + if (!PD_TID (thread->ptid)) + return NULL; + + buf = mem_fileopen (); + + pdtid = thread->private->pdtid; + tid = thread->private->tid; + + if (tid != PTHDB_INVALID_TID) + fprintf_unfiltered (buf, "tid %d", tid); + + status = pthdb_pthread_state (pd_session, pdtid, &state); + if (status != PTHDB_SUCCESS) + state = PST_NOTSUP; + fprintf_unfiltered (buf, ", %s", state2str (state)); + + status = pthdb_pthread_suspendstate (pd_session, pdtid, &suspendstate); + if (status == PTHDB_SUCCESS && suspendstate == PSS_SUSPENDED) + fprintf_unfiltered (buf, ", suspended"); + + status = pthdb_pthread_detachstate (pd_session, pdtid, &detachstate); + if (status == PTHDB_SUCCESS && detachstate == PDS_DETACHED) + fprintf_unfiltered (buf, ", detached"); + + pthdb_pthread_cancelpend (pd_session, pdtid, &cancelpend); + if (status == PTHDB_SUCCESS && cancelpend) + fprintf_unfiltered (buf, ", cancel pending"); + + ui_file_write (buf, "", 1); + + xfree (ret); /* Free old buffer. */ + + ret = ui_file_xstrdup (buf, &length); + ui_file_delete (buf); + + return ret; +} + +/* Initialize target ops. */ + +static void +init_ops (void) +{ + ops.to_shortname = "aix-threads"; + ops.to_longname = "AIX pthread support"; + ops.to_doc = "AIX pthread support"; + + ops.to_attach = ops_attach; + ops.to_detach = ops_detach; + ops.to_resume = ops_resume; + ops.to_wait = ops_wait; + ops.to_fetch_registers = ops_fetch_registers; + ops.to_store_registers = ops_store_registers; + ops.to_prepare_to_store = ops_prepare_to_store; + ops.to_xfer_memory = ops_xfer_memory; + /* No need for ops.to_create_inferior, because we activate thread debugging + when the inferior reaches pd_brk_addr. */ + ops.to_kill = ops_kill; + ops.to_mourn_inferior = ops_mourn_inferior; + ops.to_thread_alive = ops_thread_alive; + ops.to_pid_to_str = ops_pid_to_str; + ops.to_extra_thread_info = ops_extra_thread_info; + ops.to_stratum = thread_stratum; + ops.to_magic = OPS_MAGIC; +} + +/* Module startup initialization function, automagically called by + init.c. */ + +void +_initialize_aix_thread (void) +{ + init_ops (); + add_target (&ops); + + /* Notice when object files get loaded and unloaded. */ + target_new_objfile_chain = target_new_objfile_hook; + target_new_objfile_hook = new_objfile; +} |