/* Machine independent support for SVR4 /proc (process file system) for GDB. Copyright 1991, 1992 Free Software Foundation, Inc. Written by Fred Fish at Cygnus Support. 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* N O T E S For information on the details of using /proc consult section proc(4) in the UNIX System V Release 4 System Administrator's Reference Manual. The general register and floating point register sets are manipulated by separate ioctl's. This file makes the assumption that if FP0_REGNUM is defined, then support for the floating point register set is desired, regardless of whether or not the actual target has floating point hardware. */ #include "defs.h" #ifdef USE_PROC_FS /* Entire file goes away if not using /proc */ #include #include #include #include #include #include "inferior.h" #include "target.h" #include "command.h" #define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */ #ifndef PROC_NAME_FMT #define PROC_NAME_FMT "/proc/%05d" #endif #if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */ CORE_ADDR kernel_u_addr; #endif #ifdef BROKEN_SIGINFO_H /* Workaround broken SGS */ #undef si_pid #define si_pid _data._proc.pid #undef si_uid #define si_uid _data._proc._pdata._kill.uid #endif /* BROKEN_SIGINFO_H */ /* All access to the inferior, either one started by gdb or one that has been attached to, is controlled by an instance of a procinfo structure, defined below. Since gdb currently only handles one inferior at a time, the procinfo structure for the inferior is statically allocated and only one exists at any given time. There is a separate procinfo structure for use by the "info proc" command, so that we can print useful information about any random process without interfering with the inferior's procinfo information. */ struct procinfo { int valid; /* Nonzero if pid, fd, & pathname are valid */ int pid; /* Process ID of inferior */ int fd; /* File descriptor for /proc entry */ char *pathname; /* Pathname to /proc entry */ int was_stopped; /* Nonzero if was stopped prior to attach */ int nopass_next_sigstop; /* Don't pass a sigstop on next resume */ prrun_t prrun; /* Control state when it is run */ prstatus_t prstatus; /* Current process status info */ gregset_t gregset; /* General register set */ fpregset_t fpregset; /* Floating point register set */ fltset_t fltset; /* Current traced hardware fault set */ sigset_t trace; /* Current traced signal set */ sysset_t exitset; /* Current traced system call exit set */ sysset_t entryset; /* Current traced system call entry set */ fltset_t saved_fltset; /* Saved traced hardware fault set */ sigset_t saved_trace; /* Saved traced signal set */ sigset_t saved_sighold; /* Saved held signal set */ sysset_t saved_exitset; /* Saved traced system call exit set */ sysset_t saved_entryset; /* Saved traced system call entry set */ }; static struct procinfo pi; /* Inferior's process information */ /* Much of the information used in the /proc interface, particularly for printing status information, is kept as tables of structures of the following form. These tables can be used to map numeric values to their symbolic names and to a string that describes their specific use. */ struct trans { int value; /* The numeric value */ char *name; /* The equivalent symbolic value */ char *desc; /* Short description of value */ }; /* Translate bits in the pr_flags member of the prstatus structure, into the names and desc information. */ static struct trans pr_flag_table[] = { #if defined (PR_STOPPED) PR_STOPPED, "PR_STOPPED", "Process is stopped", #endif #if defined (PR_ISTOP) PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest", #endif #if defined (PR_DSTOP) PR_DSTOP, "PR_DSTOP", "A stop directive is in effect", #endif #if defined (PR_ASLEEP) PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call", #endif #if defined (PR_FORK) PR_FORK, "PR_FORK", "Inherit-on-fork is in effect", #endif #if defined (PR_RLC) PR_RLC, "PR_RLC", "Run-on-last-close is in effect", #endif #if defined (PR_PTRACE) PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace", #endif #if defined (PR_PCINVAL) PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address", #endif #if defined (PR_ISSYS) PR_ISSYS, "PR_ISSYS", "Is a system process", #endif #if defined (PR_STEP) PR_STEP, "PR_STEP", "Process has single step pending", #endif #if defined (PR_KLC) PR_KLC, "PR_KLC", "Kill-on-last-close is in effect", #endif #if defined (PR_ASYNC) PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect", #endif #if defined (PR_PCOMPAT) PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect", #endif 0, NULL, NULL }; /* Translate values in the pr_why field of the prstatus struct. */ static struct trans pr_why_table[] = { #if defined (PR_REQUESTED) PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP", #endif #if defined (PR_SIGNALLED) PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal", #endif #if defined (PR_FAULTED) PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault", #endif #if defined (PR_SYSENTRY) PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call", #endif #if defined (PR_SYSEXIT) PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call", #endif #if defined (PR_JOBCONTROL) PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action", #endif #if defined (PR_SUSPENDED) PR_SUSPENDED, "PR_SUSPENDED", "Process suspended", #endif 0, NULL, NULL }; /* Hardware fault translation table. */ static struct trans faults_table[] = { #if defined (FLTILL) FLTILL, "FLTILL", "Illegal instruction", #endif #if defined (FLTPRIV) FLTPRIV, "FLTPRIV", "Privileged instruction", #endif #if defined (FLTBPT) FLTBPT, "FLTBPT", "Breakpoint trap", #endif #if defined (FLTTRACE) FLTTRACE, "FLTTRACE", "Trace trap", #endif #if defined (FLTACCESS) FLTACCESS, "FLTACCESS", "Memory access fault", #endif #if defined (FLTBOUNDS) FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation", #endif #if defined (FLTIOVF) FLTIOVF, "FLTIOVF", "Integer overflow", #endif #if defined (FLTIZDIV) FLTIZDIV, "FLTIZDIV", "Integer zero divide", #endif #if defined (FLTFPE) FLTFPE, "FLTFPE", "Floating-point exception", #endif #if defined (FLTSTACK) FLTSTACK, "FLTSTACK", "Unrecoverable stack fault", #endif #if defined (FLTPAGE) FLTPAGE, "FLTPAGE", "Recoverable page fault", #endif 0, NULL, NULL }; /* Translation table for signal generation information. See UNIX System V Release 4 Programmer's Reference Manual, siginfo(5). */ static struct sigcode { int signo; int code; char *codename; char *desc; } siginfo_table[] = { #if defined (SIGILL) && defined (ILL_ILLOPC) SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode", #endif #if defined (SIGILL) && defined (ILL_ILLOPN) SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand", #endif #if defined (SIGILL) && defined (ILL_ILLADR) SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode", #endif #if defined (SIGILL) && defined (ILL_ILLTRP) SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap", #endif #if defined (SIGILL) && defined (ILL_PRVOPC) SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode", #endif #if defined (SIGILL) && defined (ILL_PRVREG) SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register", #endif #if defined (SIGILL) && defined (ILL_COPROC) SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error", #endif #if defined (SIGILL) && defined (ILL_BADSTK) SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error", #endif #if defined (SIGFPE) && defined (FPE_INTDIV) SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero", #endif #if defined (SIGFPE) && defined (FPE_INTOVF) SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow", #endif #if defined (SIGFPE) && defined (FPE_FLTDIV) SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero", #endif #if defined (SIGFPE) && defined (FPE_FLTOVF) SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow", #endif #if defined (SIGFPE) && defined (FPE_FLTUND) SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow", #endif #if defined (SIGFPE) && defined (FPE_FLTRES) SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result", #endif #if defined (SIGFPE) && defined (FPE_FLTINV) SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation", #endif #if defined (SIGFPE) && defined (FPE_FLTSUB) SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range", #endif #if defined (SIGSEGV) && defined (SEGV_MAPERR) SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object", #endif #if defined (SIGSEGV) && defined (SEGV_ACCERR) SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object", #endif #if defined (SIGBUS) && defined (BUS_ADRALN) SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment", #endif #if defined (SIGBUS) && defined (BUS_ADRERR) SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address", #endif #if defined (SIGBUS) && defined (BUS_OBJERR) SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error", #endif #if defined (SIGTRAP) && defined (TRAP_BRKPT) SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint", #endif #if defined (SIGTRAP) && defined (TRAP_TRACE) SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap", #endif #if defined (SIGCLD) && defined (CLD_EXITED) SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited", #endif #if defined (SIGCLD) && defined (CLD_KILLED) SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed", #endif #if defined (SIGCLD) && defined (CLD_DUMPED) SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally", #endif #if defined (SIGCLD) && defined (CLD_TRAPPED) SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped", #endif #if defined (SIGCLD) && defined (CLD_STOPPED) SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped", #endif #if defined (SIGCLD) && defined (CLD_CONTINUED) SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued", #endif #if defined (SIGPOLL) && defined (POLL_IN) SIGPOLL, POLL_IN, "POLL_IN", "Input input available", #endif #if defined (SIGPOLL) && defined (POLL_OUT) SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available", #endif #if defined (SIGPOLL) && defined (POLL_MSG) SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available", #endif #if defined (SIGPOLL) && defined (POLL_ERR) SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error", #endif #if defined (SIGPOLL) && defined (POLL_PRI) SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available", #endif #if defined (SIGPOLL) && defined (POLL_HUP) SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected", #endif 0, 0, NULL, NULL }; static char *syscall_table[MAX_SYSCALLS]; /* Prototypes for local functions */ static void set_proc_siginfo PARAMS ((struct procinfo *, int)); static void init_syscall_table PARAMS ((void)); static char * syscallname PARAMS ((int)); static char * signalname PARAMS ((int)); static char * errnoname PARAMS ((int)); static int proc_address_to_fd PARAMS ((CORE_ADDR, int)); static int open_proc_file PARAMS ((int, struct procinfo *, int)); static void close_proc_file PARAMS ((struct procinfo *)); static void unconditionally_kill_inferior PARAMS ((void)); static void proc_init_failed PARAMS ((char *)); static void info_proc PARAMS ((char *, int)); static void info_proc_flags PARAMS ((struct procinfo *, int)); static void info_proc_stop PARAMS ((struct procinfo *, int)); static void info_proc_siginfo PARAMS ((struct procinfo *, int)); static void info_proc_syscalls PARAMS ((struct procinfo *, int)); static void info_proc_mappings PARAMS ((struct procinfo *, int)); static void info_proc_signals PARAMS ((struct procinfo *, int)); static void info_proc_faults PARAMS ((struct procinfo *, int)); static char * mappingflags PARAMS ((long)); static char * lookupname PARAMS ((struct trans *, unsigned int, char *)); static char * lookupdesc PARAMS ((struct trans *, unsigned int)); /* External function prototypes that can't be easily included in any header file because the args are typedefs in system include files. */ extern void supply_gregset PARAMS ((gregset_t *)); extern void fill_gregset PARAMS ((gregset_t *, int)); extern void supply_fpregset PARAMS ((fpregset_t *)); extern void fill_fpregset PARAMS ((fpregset_t *, int)); /* LOCAL FUNCTION lookupdesc -- translate a value to a summary desc string SYNOPSIS static char *lookupdesc (struct trans *transp, unsigned int val); DESCRIPTION Given a pointer to a translation table and a value to be translated, lookup the desc string and return it. */ static char * lookupdesc (transp, val) struct trans *transp; unsigned int val; { char *desc; for (desc = NULL; transp -> name != NULL; transp++) { if (transp -> value == val) { desc = transp -> desc; break; } } /* Didn't find a translation for the specified value, set a default one. */ if (desc == NULL) { desc = "Unknown"; } return (desc); } /* LOCAL FUNCTION lookupname -- translate a value to symbolic name SYNOPSIS static char *lookupname (struct trans *transp, unsigned int val, char *prefix); DESCRIPTION Given a pointer to a translation table, a value to be translated, and a default prefix to return if the value can't be translated, match the value with one of the translation table entries and return a pointer to the symbolic name. If no match is found it just returns the value as a printable string, with the given prefix. The previous such value, if any, is freed at this time. */ static char * lookupname (transp, val, prefix) struct trans *transp; unsigned int val; char *prefix; { static char *locbuf; char *name; for (name = NULL; transp -> name != NULL; transp++) { if (transp -> value == val) { name = transp -> name; break; } } /* Didn't find a translation for the specified value, build a default one using the specified prefix and return it. The lifetime of the value is only until the next one is needed. */ if (name == NULL) { if (locbuf != NULL) { free (locbuf); } locbuf = xmalloc (strlen (prefix) + 16); sprintf (locbuf, "%s %u", prefix, val); name = locbuf; } return (name); } static char * sigcodename (sip) siginfo_t *sip; { struct sigcode *scp; char *name = NULL; static char locbuf[32]; for (scp = siginfo_table; scp -> codename != NULL; scp++) { if ((scp -> signo == sip -> si_signo) && (scp -> code == sip -> si_code)) { name = scp -> codename; break; } } if (name == NULL) { sprintf (locbuf, "sigcode %u", sip -> si_signo); name = locbuf; } return (name); } static char *sigcodedesc (sip) siginfo_t *sip; { struct sigcode *scp; char *desc = NULL; for (scp = siginfo_table; scp -> codename != NULL; scp++) { if ((scp -> signo == sip -> si_signo) && (scp -> code == sip -> si_code)) { desc = scp -> desc; break; } } if (desc == NULL) { desc = "Unrecognized signal or trap use"; } return (desc); } /* LOCAL FUNCTION syscallname - translate a system call number into a system call name SYNOPSIS char *syscallname (int syscallnum) DESCRIPTION Given a system call number, translate it into the printable name of a system call, or into "syscall " if it is an unknown number. */ static char * syscallname (syscallnum) int syscallnum; { static char locbuf[32]; char *rtnval; if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS) { rtnval = syscall_table[syscallnum]; } else { sprintf (locbuf, "syscall %u", syscallnum); rtnval = locbuf; } return (rtnval); } /* LOCAL FUNCTION init_syscall_table - initialize syscall translation table SYNOPSIS void init_syscall_table (void) DESCRIPTION Dynamically initialize the translation table to convert system call numbers into printable system call names. Done once per gdb run, on initialization. NOTES This is awfully ugly, but preprocessor tricks to make it prettier tend to be nonportable. */ static void init_syscall_table () { #if defined (SYS_exit) syscall_table[SYS_exit] = "exit"; #endif #if defined (SYS_fork) syscall_table[SYS_fork] = "fork"; #endif #if defined (SYS_read) syscall_table[SYS_read] = "read"; #endif #if defined (SYS_write) syscall_table[SYS_write] = "write"; #endif #if defined (SYS_open) syscall_table[SYS_open] = "open"; #endif #if defined (SYS_close) syscall_table[SYS_close] = "close"; #endif #if defined (SYS_wait) syscall_table[SYS_wait] = "wait"; #endif #if defined (SYS_creat) syscall_table[SYS_creat] = "creat"; #endif #if defined (SYS_link) syscall_table[SYS_link] = "link"; #endif #if defined (SYS_unlink) syscall_table[SYS_unlink] = "unlink"; #endif #if defined (SYS_exec) syscall_table[SYS_exec] = "exec"; #endif #if defined (SYS_execv) syscall_table[SYS_execv] = "execv"; #endif #if defined (SYS_execve) syscall_table[SYS_execve] = "execve"; #endif #if defined (SYS_chdir) syscall_table[SYS_chdir] = "chdir"; #endif #if defined (SYS_time) syscall_table[SYS_time] = "time"; #endif #if defined (SYS_mknod) syscall_table[SYS_mknod] = "mknod"; #endif #if defined (SYS_chmod) syscall_table[SYS_chmod] = "chmod"; #endif #if defined (SYS_chown) syscall_table[SYS_chown] = "chown"; #endif #if defined (SYS_brk) syscall_table[SYS_brk] = "brk"; #endif #if defined (SYS_stat) syscall_table[SYS_stat] = "stat"; #endif #if defined (SYS_lseek) syscall_table[SYS_lseek] = "lseek"; #endif #if defined (SYS_getpid) syscall_table[SYS_getpid] = "getpid"; #endif #if defined (SYS_mount) syscall_table[SYS_mount] = "mount"; #endif #if defined (SYS_umount) syscall_table[SYS_umount] = "umount"; #endif #if defined (SYS_setuid) syscall_table[SYS_setuid] = "setuid"; #endif #if defined (SYS_getuid) syscall_table[SYS_getuid] = "getuid"; #endif #if defined (SYS_stime) syscall_table[SYS_stime] = "stime"; #endif #if defined (SYS_ptrace) syscall_table[SYS_ptrace] = "ptrace"; #endif #if defined (SYS_alarm) syscall_table[SYS_alarm] = "alarm"; #endif #if defined (SYS_fstat) syscall_table[SYS_fstat] = "fstat"; #endif #if defined (SYS_pause) syscall_table[SYS_pause] = "pause"; #endif #if defined (SYS_utime) syscall_table[SYS_utime] = "utime"; #endif #if defined (SYS_stty) syscall_table[SYS_stty] = "stty"; #endif #if defined (SYS_gtty) syscall_table[SYS_gtty] = "gtty"; #endif #if defined (SYS_access) syscall_table[SYS_access] = "access"; #endif #if defined (SYS_nice) syscall_table[SYS_nice] = "nice"; #endif #if defined (SYS_statfs) syscall_table[SYS_statfs] = "statfs"; #endif #if defined (SYS_sync) syscall_table[SYS_sync] = "sync"; #endif #if defined (SYS_kill) syscall_table[SYS_kill] = "kill"; #endif #if defined (SYS_fstatfs) syscall_table[SYS_fstatfs] = "fstatfs"; #endif #if defined (SYS_pgrpsys) syscall_table[SYS_pgrpsys] = "pgrpsys"; #endif #if defined (SYS_xenix) syscall_table[SYS_xenix] = "xenix"; #endif #if defined (SYS_dup) syscall_table[SYS_dup] = "dup"; #endif #if defined (SYS_pipe) syscall_table[SYS_pipe] = "pipe"; #endif #if defined (SYS_times) syscall_table[SYS_times] = "times"; #endif #if defined (SYS_profil) syscall_table[SYS_profil] = "profil"; #endif #if defined (SYS_plock) syscall_table[SYS_plock] = "plock"; #endif #if defined (SYS_setgid) syscall_table[SYS_setgid] = "setgid"; #endif #if defined (SYS_getgid) syscall_table[SYS_getgid] = "getgid"; #endif #if defined (SYS_signal) syscall_table[SYS_signal] = "signal"; #endif #if defined (SYS_msgsys) syscall_table[SYS_msgsys] = "msgsys"; #endif #if defined (SYS_sys3b) syscall_table[SYS_sys3b] = "sys3b"; #endif #if defined (SYS_acct) syscall_table[SYS_acct] = "acct"; #endif #if defined (SYS_shmsys) syscall_table[SYS_shmsys] = "shmsys"; #endif #if defined (SYS_semsys) syscall_table[SYS_semsys] = "semsys"; #endif #if defined (SYS_ioctl) syscall_table[SYS_ioctl] = "ioctl"; #endif #if defined (SYS_uadmin) syscall_table[SYS_uadmin] = "uadmin"; #endif #if defined (SYS_utssys) syscall_table[SYS_utssys] = "utssys"; #endif #if defined (SYS_fsync) syscall_table[SYS_fsync] = "fsync"; #endif #if defined (SYS_umask) syscall_table[SYS_umask] = "umask"; #endif #if defined (SYS_chroot) syscall_table[SYS_chroot] = "chroot"; #endif #if defined (SYS_fcntl) syscall_table[SYS_fcntl] = "fcntl"; #endif #if defined (SYS_ulimit) syscall_table[SYS_ulimit] = "ulimit"; #endif #if defined (SYS_rfsys) syscall_table[SYS_rfsys] = "rfsys"; #endif #if defined (SYS_rmdir) syscall_table[SYS_rmdir] = "rmdir"; #endif #if defined (SYS_mkdir) syscall_table[SYS_mkdir] = "mkdir"; #endif #if defined (SYS_getdents) syscall_table[SYS_getdents] = "getdents"; #endif #if defined (SYS_sysfs) syscall_table[SYS_sysfs] = "sysfs"; #endif #if defined (SYS_getmsg) syscall_table[SYS_getmsg] = "getmsg"; #endif #if defined (SYS_putmsg) syscall_table[SYS_putmsg] = "putmsg"; #endif #if defined (SYS_poll) syscall_table[SYS_poll] = "poll"; #endif #if defined (SYS_lstat) syscall_table[SYS_lstat] = "lstat"; #endif #if defined (SYS_symlink) syscall_table[SYS_symlink] = "symlink"; #endif #if defined (SYS_readlink) syscall_table[SYS_readlink] = "readlink"; #endif #if defined (SYS_setgroups) syscall_table[SYS_setgroups] = "setgroups"; #endif #if defined (SYS_getgroups) syscall_table[SYS_getgroups] = "getgroups"; #endif #if defined (SYS_fchmod) syscall_table[SYS_fchmod] = "fchmod"; #endif #if defined (SYS_fchown) syscall_table[SYS_fchown] = "fchown"; #endif #if defined (SYS_sigprocmask) syscall_table[SYS_sigprocmask] = "sigprocmask"; #endif #if defined (SYS_sigsuspend) syscall_table[SYS_sigsuspend] = "sigsuspend"; #endif #if defined (SYS_sigaltstack) syscall_table[SYS_sigaltstack] = "sigaltstack"; #endif #if defined (SYS_sigaction) syscall_table[SYS_sigaction] = "sigaction"; #endif #if defined (SYS_sigpending) syscall_table[SYS_sigpending] = "sigpending"; #endif #if defined (SYS_context) syscall_table[SYS_context] = "context"; #endif #if defined (SYS_evsys) syscall_table[SYS_evsys] = "evsys"; #endif #if defined (SYS_evtrapret) syscall_table[SYS_evtrapret] = "evtrapret"; #endif #if defined (SYS_statvfs) syscall_table[SYS_statvfs] = "statvfs"; #endif #if defined (SYS_fstatvfs) syscall_table[SYS_fstatvfs] = "fstatvfs"; #endif #if defined (SYS_nfssys) syscall_table[SYS_nfssys] = "nfssys"; #endif #if defined (SYS_waitsys) syscall_table[SYS_waitsys] = "waitsys"; #endif #if defined (SYS_sigsendsys) syscall_table[SYS_sigsendsys] = "sigsendsys"; #endif #if defined (SYS_hrtsys) syscall_table[SYS_hrtsys] = "hrtsys"; #endif #if defined (SYS_acancel) syscall_table[SYS_acancel] = "acancel"; #endif #if defined (SYS_async) syscall_table[SYS_async] = "async"; #endif #if defined (SYS_priocntlsys) syscall_table[SYS_priocntlsys] = "priocntlsys"; #endif #if defined (SYS_pathconf) syscall_table[SYS_pathconf] = "pathconf"; #endif #if defined (SYS_mincore) syscall_table[SYS_mincore] = "mincore"; #endif #if defined (SYS_mmap) syscall_table[SYS_mmap] = "mmap"; #endif #if defined (SYS_mprotect) syscall_table[SYS_mprotect] = "mprotect"; #endif #if defined (SYS_munmap) syscall_table[SYS_munmap] = "munmap"; #endif #if defined (SYS_fpathconf) syscall_table[SYS_fpathconf] = "fpathconf"; #endif #if defined (SYS_vfork) syscall_table[SYS_vfork] = "vfork"; #endif #if defined (SYS_fchdir) syscall_table[SYS_fchdir] = "fchdir"; #endif #if defined (SYS_readv) syscall_table[SYS_readv] = "readv"; #endif #if defined (SYS_writev) syscall_table[SYS_writev] = "writev"; #endif #if defined (SYS_xstat) syscall_table[SYS_xstat] = "xstat"; #endif #if defined (SYS_lxstat) syscall_table[SYS_lxstat] = "lxstat"; #endif #if defined (SYS_fxstat) syscall_table[SYS_fxstat] = "fxstat"; #endif #if defined (SYS_xmknod) syscall_table[SYS_xmknod] = "xmknod"; #endif #if defined (SYS_clocal) syscall_table[SYS_clocal] = "clocal"; #endif #if defined (SYS_setrlimit) syscall_table[SYS_setrlimit] = "setrlimit"; #endif #if defined (SYS_getrlimit) syscall_table[SYS_getrlimit] = "getrlimit"; #endif #if defined (SYS_lchown) syscall_table[SYS_lchown] = "lchown"; #endif #if defined (SYS_memcntl) syscall_table[SYS_memcntl] = "memcntl"; #endif #if defined (SYS_getpmsg) syscall_table[SYS_getpmsg] = "getpmsg"; #endif #if defined (SYS_putpmsg) syscall_table[SYS_putpmsg] = "putpmsg"; #endif #if defined (SYS_rename) syscall_table[SYS_rename] = "rename"; #endif #if defined (SYS_uname) syscall_table[SYS_uname] = "uname"; #endif #if defined (SYS_setegid) syscall_table[SYS_setegid] = "setegid"; #endif #if defined (SYS_sysconfig) syscall_table[SYS_sysconfig] = "sysconfig"; #endif #if defined (SYS_adjtime) syscall_table[SYS_adjtime] = "adjtime"; #endif #if defined (SYS_systeminfo) syscall_table[SYS_systeminfo] = "systeminfo"; #endif #if defined (SYS_seteuid) syscall_table[SYS_seteuid] = "seteuid"; #endif } /* GLOBAL FUNCTION ptrace -- override library version to force errors for /proc version SYNOPSIS int ptrace (int request, int pid, PTRACE_ARG3_TYPE arg3, int arg4) DESCRIPTION When gdb is configured to use /proc, it should not be calling or otherwise attempting to use ptrace. In order to catch errors where use of /proc is configured, but some routine is still calling ptrace, we provide a local version of a function with that name that does nothing but issue an error message. */ int ptrace (request, pid, arg3, arg4) int request; int pid; PTRACE_ARG3_TYPE arg3; int arg4; { error ("internal error - there is a call to ptrace() somewhere"); /*NOTREACHED*/ } /* GLOBAL FUNCTION kill_inferior_fast -- kill inferior while gdb is exiting SYNOPSIS void kill_inferior_fast (void) DESCRIPTION This is used when GDB is exiting. It gives less chance of error. NOTES Don't attempt to kill attached inferiors since we may be called when gdb is in the process of aborting, and killing the attached inferior may be very anti-social. This is particularly true if we were attached just so we could use the /proc facilities to get detailed information about it's status. */ void kill_inferior_fast () { if (inferior_pid != 0 && !attach_flag) { unconditionally_kill_inferior (); } } /* GLOBAL FUNCTION kill_inferior - kill any currently inferior SYNOPSIS void kill_inferior (void) DESCRIPTION Kill any current inferior. NOTES Kills even attached inferiors. Presumably the user has already been prompted that the inferior is an attached one rather than one started by gdb. (FIXME?) */ void kill_inferior () { if (inferior_pid != 0) { unconditionally_kill_inferior (); target_mourn_inferior (); } } /* LOCAL FUNCTION unconditionally_kill_inferior - terminate the inferior SYNOPSIS static void unconditionally_kill_inferior (void) DESCRIPTION Kill the current inferior. Should not be called until it is at least tested that there is an inferior. NOTE A possibly useful enhancement would be to first try sending the inferior a terminate signal, politely asking it to commit suicide, before we murder it. */ static void unconditionally_kill_inferior () { int signo; signo = SIGKILL; ioctl (pi.fd, PIOCKILL, &signo); close_proc_file (&pi); wait ((int *) 0); } /* GLOBAL FUNCTION child_xfer_memory -- copy data to or from inferior memory space SYNOPSIS int child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int dowrite, struct target_ops target) DESCRIPTION Copy LEN bytes to/from inferior's memory starting at MEMADDR from/to debugger memory starting at MYADDR. Copy from inferior if DOWRITE is zero or to inferior if DOWRITE is nonzero. Returns the length copied, which is either the LEN argument or zero. This xfer function does not do partial moves, since child_ops doesn't allow memory operations to cross below us in the target stack anyway. NOTES The /proc interface makes this an almost trivial task. */ int child_xfer_memory (memaddr, myaddr, len, dowrite, target) CORE_ADDR memaddr; char *myaddr; int len; int dowrite; struct target_ops *target; /* ignored */ { int nbytes = 0; if (lseek (pi.fd, (off_t) memaddr, 0) == (off_t) memaddr) { if (dowrite) { nbytes = write (pi.fd, myaddr, len); } else { nbytes = read (pi.fd, myaddr, len); } if (nbytes < 0) { nbytes = 0; } } return (nbytes); } /* GLOBAL FUNCTION store_inferior_registers -- copy register values back to inferior SYNOPSIS void store_inferior_registers (int regno) DESCRIPTION Store our current register values back into the inferior. If REGNO is -1 then store all the register, otherwise store just the value specified by REGNO. NOTES If we are storing only a single register, we first have to get all the current values from the process, overwrite the desired register in the gregset with the one we want from gdb's registers, and then send the whole set back to the process. For writing all the registers, all we have to do is generate the gregset and send it to the process. Also note that the process has to be stopped on an event of interest for this to work, which basically means that it has to have been run under the control of one of the other /proc ioctl calls and not ptrace. Since we don't use ptrace anyway, we don't worry about this fine point, but it is worth noting for future reference. Gdb is confused about what this function is supposed to return. Some versions return a value, others return nothing. Some are declared to return a value and actually return nothing. Gdb ignores anything returned. (FIXME) */ void store_inferior_registers (regno) int regno; { if (regno != -1) { ioctl (pi.fd, PIOCGREG, &pi.gregset); } fill_gregset (&pi.gregset, regno); ioctl (pi.fd, PIOCSREG, &pi.gregset); #if defined (FP0_REGNUM) /* Now repeat everything using the floating point register set, if the target has floating point hardware. Since we ignore the returned value, we'll never know whether it worked or not anyway. */ if (regno != -1) { ioctl (pi.fd, PIOCGFPREG, &pi.fpregset); } fill_fpregset (&pi.fpregset, regno); ioctl (pi.fd, PIOCSFPREG, &pi.fpregset); #endif /* FP0_REGNUM */ } /* GLOBAL FUNCTION inferior_proc_init - initialize access to a /proc entry SYNOPSIS void inferior_proc_init (int pid) DESCRIPTION When gdb starts an inferior, this function is called in the parent process immediately after the fork. It waits for the child to stop on the return from the exec system call (the child itself takes care of ensuring that this is set up), then sets up the set of signals and faults that are to be traced. NOTES If proc_init_failed ever gets called, control returns to the command processing loop via the standard error handling code. */ void inferior_proc_init (pid) int pid; { if (!open_proc_file (pid, &pi, O_RDWR)) { proc_init_failed ("can't open process file"); } else { memset ((char *) &pi.prrun, 0, sizeof (pi.prrun)); prfillset (&pi.prrun.pr_trace); proc_signal_handling_change (); prfillset (&pi.prrun.pr_fault); prdelset (&pi.prrun.pr_fault, FLTPAGE); if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0) { proc_init_failed ("PIOCWSTOP failed"); } else if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault) < 0) { proc_init_failed ("PIOCSFAULT failed"); } } } /* GLOBAL FUNCTION proc_signal_handling_change SYNOPSIS void proc_signal_handling_change (void); DESCRIPTION When the user changes the state of gdb's signal handling via the "handle" command, this function gets called to see if any change in the /proc interface is required. It is also called internally by other /proc interface functions to initialize the state of the traced signal set. One thing it does is that signals for which the state is "nostop", "noprint", and "pass", have their trace bits reset in the pr_trace field, so that they are no longer traced. This allows them to be delivered directly to the inferior without the debugger ever being involved. */ void proc_signal_handling_change () { int signo; if (pi.valid) { for (signo = 0; signo < NSIG; signo++) { if (signal_stop_state (signo) == 0 && signal_print_state (signo) == 0 && signal_pass_state (signo) == 1) { prdelset (&pi.prrun.pr_trace, signo); } else { praddset (&pi.prrun.pr_trace, signo); } } if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace)) { print_sys_errmsg ("PIOCSTRACE failed", errno); } } } /* GLOBAL FUNCTION proc_set_exec_trap -- arrange for exec'd child to halt at startup SYNOPSIS void proc_set_exec_trap (void) DESCRIPTION This function is called in the child process when starting up an inferior, prior to doing the exec of the actual inferior. It sets the child process's exitset to make exit from the exec system call an event of interest to stop on, and then simply returns. The child does the exec, the system call returns, and the child stops at the first instruction, ready for the gdb parent process to take control of it. NOTE We need to use all local variables since the child may be sharing it's data space with the parent, if vfork was used rather than fork. Also note that we want to turn off the inherit-on-fork flag in the child process so that any grand-children start with all tracing flags cleared. */ void proc_set_exec_trap () { sysset_t exitset; auto char procname[32]; int fd; sprintf (procname, PROC_NAME_FMT, getpid ()); if ((fd = open (procname, O_RDWR)) < 0) { perror (procname); fflush (stderr); _exit (127); } premptyset (&exitset); /* GW: Rationale... Not all systems with /proc have all the exec* syscalls with the same names. On the SGI, for example, there is no SYS_exec, but there *is* a SYS_execv. So, we try to account for that. */ #ifdef SYS_exec praddset (&exitset, SYS_exec); #endif #ifdef SYS_execve praddset (&exitset, SYS_execve); #endif #ifdef SYS_execv praddset(&exitset, SYS_execv); #endif if (ioctl (fd, PIOCSEXIT, &exitset) < 0) { perror (procname); fflush (stderr); _exit (127); } /* Turn off inherit-on-fork flag so that all grand-children of gdb start with tracing flags cleared. */ #if defined (PIOCRESET) /* New method */ { long pr_flags; pr_flags = PR_FORK; ioctl (fd, PIOCRESET, &pr_flags); } #else #if defined (PIOCRFORK) /* Original method */ ioctl (fd, PIOCRFORK, NULL); #endif #endif /* Turn on run-on-last-close flag so that this process will not hang if GDB goes away for some reason. */ #if defined (PIOCSET) /* New method */ { long pr_flags; pr_flags = PR_RLC; (void) ioctl (fd, PIOCSET, &pr_flags); } #else #if defined (PIOCSRLC) /* Original method */ (void) ioctl (fd, PIOCSRLC, 0); #endif #endif } /* GLOBAL FUNCTION proc_iterate_over_mappings -- call function for every mapped space SYNOPSIS int proc_iterate_over_mappings (int (*func)()) DESCRIPTION Given a pointer to a function, call that function for every mapped address space, passing it an open file descriptor for the file corresponding to that mapped address space (if any) and the base address of the mapped space. Quit when we hit the end of the mappings or the function returns nonzero. */ int proc_iterate_over_mappings (func) int (*func) PARAMS ((int, CORE_ADDR)); { int nmap; int fd; int funcstat = 0; struct prmap *prmaps; struct prmap *prmap; if (pi.valid && (ioctl (pi.fd, PIOCNMAP, &nmap) == 0)) { prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps)); if (ioctl (pi.fd, PIOCMAP, prmaps) == 0) { for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap) { fd = proc_address_to_fd ((CORE_ADDR) prmap -> pr_vaddr, 0); funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr); close (fd); } } } return (funcstat); } /* GLOBAL FUNCTION proc_base_address -- find base address for segment containing address SYNOPSIS CORE_ADDR proc_base_address (CORE_ADDR addr) DESCRIPTION Given an address of a location in the inferior, find and return the base address of the mapped segment containing that address. This is used for example, by the shared library support code, where we have the pc value for some location in the shared library where we are stopped, and need to know the base address of the segment containing that address. */ #if 0 /* Currently unused */ CORE_ADDR proc_base_address (addr) CORE_ADDR addr; { int nmap; struct prmap *prmaps; struct prmap *prmap; CORE_ADDR baseaddr = 0; if (pi.valid && (ioctl (pi.fd, PIOCNMAP, &nmap) == 0)) { prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps)); if (ioctl (pi.fd, PIOCMAP, prmaps) == 0) { for (prmap = prmaps; prmap -> pr_size; ++prmap) { if ((prmap -> pr_vaddr <= (caddr_t) addr) && (prmap -> pr_vaddr + prmap -> pr_size > (caddr_t) addr)) { baseaddr = (CORE_ADDR) prmap -> pr_vaddr; break; } } } } return (baseaddr); } #endif /* 0 */ /* LOCAL FUNCTION proc_address_to_fd -- return open fd for file mapped to address SYNOPSIS int proc_address_to_fd (CORE_ADDR addr, complain) DESCRIPTION Given an address in the current inferior's address space, use the /proc interface to find an open file descriptor for the file that this address was mapped in from. Return -1 if there is no current inferior. Print a warning message if there is an inferior but the address corresponds to no file (IE a bogus address). */ static int proc_address_to_fd (addr, complain) CORE_ADDR addr; int complain; { int fd = -1; if (pi.valid) { if ((fd = ioctl (pi.fd, PIOCOPENM, (caddr_t *) &addr)) < 0) { if (complain) { print_sys_errmsg (pi.pathname, errno); warning ("can't find mapped file for address 0x%x", addr); } } } return (fd); } #ifdef ATTACH_DETACH /* GLOBAL FUNCTION attach -- attach to an already existing process SYNOPSIS int attach (int pid) DESCRIPTION Attach to an already existing process with the specified process id. If the process is not already stopped, query whether to stop it or not. NOTES The option of stopping at attach time is specific to the /proc versions of gdb. Versions using ptrace force the attachee to stop. (I have changed this version to do so, too. All you have to do is "continue" to make it go on. -- gnu@cygnus.com) */ int attach (pid) int pid; { int result; if (!open_proc_file (pid, &pi, O_RDWR)) { perror_with_name (pi.pathname); /* NOTREACHED */ } /* Get current status of process and if it is not already stopped, then stop it. Remember whether or not it was stopped when we first examined it. */ if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0) { print_sys_errmsg (pi.pathname, errno); close_proc_file (&pi); error ("PIOCSTATUS failed"); } if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)) { pi.was_stopped = 1; } else { pi.was_stopped = 0; if (1 || query ("Process is currently running, stop it? ")) { /* Make it run again when we close it. */ #if defined (PIOCSET) /* New method */ { long pr_flags; pr_flags = PR_RLC; result = ioctl (pi.fd, PIOCSET, &pr_flags); } #else #if defined (PIOCSRLC) /* Original method */ result = ioctl (pi.fd, PIOCSRLC, 0); #endif #endif if (result < 0) { print_sys_errmsg (pi.pathname, errno); close_proc_file (&pi); error ("PIOCSRLC or PIOCSET failed"); } if (ioctl (pi.fd, PIOCSTOP, &pi.prstatus) < 0) { print_sys_errmsg (pi.pathname, errno); close_proc_file (&pi); error ("PIOCSTOP failed"); } pi.nopass_next_sigstop = 1; } else { printf ("Ok, gdb will wait for process %u to stop.\n", pid); } } /* Remember some things about the inferior that we will, or might, change so that we can restore them when we detach. */ ioctl (pi.fd, PIOCGTRACE, &pi.saved_trace); ioctl (pi.fd, PIOCGHOLD, &pi.saved_sighold); ioctl (pi.fd, PIOCGFAULT, &pi.saved_fltset); ioctl (pi.fd, PIOCGENTRY, &pi.saved_entryset); ioctl (pi.fd, PIOCGEXIT, &pi.saved_exitset); /* Set up trace and fault sets, as gdb expects them. */ memset (&pi.prrun, 0, sizeof (pi.prrun)); prfillset (&pi.prrun.pr_trace); proc_signal_handling_change (); prfillset (&pi.prrun.pr_fault); prdelset (&pi.prrun.pr_fault, FLTPAGE); if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault)) { print_sys_errmsg ("PIOCSFAULT failed", errno); } if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace)) { print_sys_errmsg ("PIOCSTRACE failed", errno); } attach_flag = 1; return (pid); } /* GLOBAL FUNCTION detach -- detach from an attached-to process SYNOPSIS void detach (int signal) DESCRIPTION Detach from the current attachee. If signal is non-zero, the attachee is started running again and sent the specified signal. If signal is zero and the attachee was not already stopped when we attached to it, then we make it runnable again when we detach. Otherwise, we query whether or not to make the attachee runnable again, since we may simply want to leave it in the state it was in when we attached. We report any problems, but do not consider them errors, since we MUST detach even if some things don't seem to go right. This may not be the ideal situation. (FIXME). */ void detach (signal) int signal; { int result; if (signal) { set_proc_siginfo (&pi, signal); } if (ioctl (pi.fd, PIOCSEXIT, &pi.saved_exitset) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSEXIT failed.\n"); } if (ioctl (pi.fd, PIOCSENTRY, &pi.saved_entryset) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSENTRY failed.\n"); } if (ioctl (pi.fd, PIOCSTRACE, &pi.saved_trace) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSTRACE failed.\n"); } if (ioctl (pi.fd, PIOCSHOLD, &pi.saved_sighold) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOSCHOLD failed.\n"); } if (ioctl (pi.fd, PIOCSFAULT, &pi.saved_fltset) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSFAULT failed.\n"); } if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSTATUS failed.\n"); } else { if (signal || (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))) { if (signal || !pi.was_stopped || query ("Was stopped when attached, make it runnable again? ")) { /* Clear any fault that might have stopped it. */ if (ioctl (pi.fd, PIOCCFAULT, 0)) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCCFAULT failed.\n"); } /* Make it run again when we close it. */ #if defined (PIOCSET) /* New method */ { long pr_flags; pr_flags = PR_RLC; result = ioctl (pi.fd, PIOCSET, &pr_flags); } #else #if defined (PIOCSRLC) /* Original method */ result = ioctl (pi.fd, PIOCSRLC, 0); #endif #endif if (result) { print_sys_errmsg (pi.pathname, errno); printf ("PIOCSRLC or PIOCSET failed.\n"); } } } } close_proc_file (&pi); attach_flag = 0; } #endif /* ATTACH_DETACH */ /* GLOBAL FUNCTION proc_wait -- emulate wait() as much as possible SYNOPSIS int proc_wait (int *statloc) DESCRIPTION Try to emulate wait() as much as possible. Not sure why we can't just use wait(), but it seems to have problems when applied to a process being controlled with the /proc interface. NOTES We have a race problem here with no obvious solution. We need to let the inferior run until it stops on an event of interest, which means that we need to use the PIOCWSTOP ioctl. However, we cannot use this ioctl if the process is already stopped on something that is not an event of interest, or the call will hang indefinitely. Thus we first use PIOCSTATUS to see if the process is not stopped. If not, then we use PIOCWSTOP. But during the window between the two, if the process stops for any reason that is not an event of interest (such as a job control signal) then gdb will hang. One possible workaround is to set an alarm to wake up every minute of so and check to see if the process is still running, and if so, then reissue the PIOCWSTOP. But this is a real kludge, so has not been implemented. FIXME: investigate alternatives. FIXME: Investigate why wait() seems to have problems with programs being control by /proc routines. */ int proc_wait (statloc) int *statloc; { short what; short why; int statval = 0; int checkerr = 0; int rtnval = -1; if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0) { checkerr++; } else if (!(pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))) { if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0) { checkerr++; } } if (checkerr) { if (errno == ENOENT) { rtnval = wait (&statval); if (rtnval != inferior_pid) { print_sys_errmsg (pi.pathname, errno); error ("PIOCWSTOP, wait failed, returned %d", rtnval); /* NOTREACHED */ } } else { print_sys_errmsg (pi.pathname, errno); error ("PIOCSTATUS or PIOCWSTOP failed."); /* NOTREACHED */ } } else if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)) { rtnval = pi.prstatus.pr_pid; why = pi.prstatus.pr_why; what = pi.prstatus.pr_what; if (why == PR_SIGNALLED) { statval = (what << 8) | 0177; } else if ((why == PR_SYSEXIT) && ( #ifdef SYS_exec what == SYS_exec #else 0 == 0 #endif #ifdef SYS_execve || what == SYS_execve #endif #ifdef SYS_execv || what == SYS_execv #endif )) { statval = (SIGTRAP << 8) | 0177; } else if (why == PR_REQUESTED) { statval = (SIGSTOP << 8) | 0177; } else if (why == PR_JOBCONTROL) { statval = (what << 8) | 0177; } else if (why == PR_FAULTED) { switch (what) { case FLTPRIV: case FLTILL: statval = (SIGILL << 8) | 0177; break; case FLTBPT: case FLTTRACE: statval = (SIGTRAP << 8) | 0177; break; case FLTSTACK: case FLTACCESS: case FLTBOUNDS: statval = (SIGSEGV << 8) | 0177; break; case FLTIOVF: case FLTIZDIV: case FLTFPE: statval = (SIGFPE << 8) | 0177; break; case FLTPAGE: /* Recoverable page fault */ default: rtnval = -1; error ("PIOCWSTOP, unknown why %d, what %d", why, what); /* NOTREACHED */ } } else { rtnval = -1; error ("PIOCWSTOP, unknown why %d, what %d", why, what); /* NOTREACHED */ } } else { error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x", pi.prstatus.pr_flags); /* NOTREACHED */ } if (statloc) { *statloc = statval; } return (rtnval); } /* LOCAL FUNCTION set_proc_siginfo - set a process's current signal info SYNOPSIS void set_proc_siginfo (struct procinfo *pip, int signo); DESCRIPTION Given a pointer to a process info struct in PIP and a signal number in SIGNO, set the process's current signal and its associated signal information. The signal will be delivered to the process immediately after execution is resumed, even if it is being held. In addition, this particular delivery will not cause another PR_SIGNALLED stop even if the signal is being traced. If we are not delivering the same signal that the prstatus siginfo struct contains information about, then synthesize a siginfo struct to match the signal we are doing to deliver, make it of the type "generated by a user process", and send this synthesized copy. When used to set the inferior's signal state, this will be required if we are not currently stopped because of a traced signal, or if we decide to continue with a different signal. Note that when continuing the inferior from a stop due to receipt of a traced signal, we either have set PRCSIG to clear the existing signal, or we have to call this function to do a PIOCSSIG with either the existing siginfo struct from pr_info, or one we have synthesized appropriately for the signal we want to deliver. Otherwise if the signal is still being traced, the inferior will immediately stop again. See siginfo(5) for more details. */ static void set_proc_siginfo (pip, signo) struct procinfo *pip; int signo; { struct siginfo newsiginfo; struct siginfo *sip; if (pip -> valid) { if (signo == pip -> prstatus.pr_info.si_signo) { sip = &pip -> prstatus.pr_info; } else { memset ((char *) &newsiginfo, 0, sizeof (newsiginfo)); sip = &newsiginfo; sip -> si_signo = signo; sip -> si_code = 0; sip -> si_errno = 0; sip -> si_pid = getpid (); sip -> si_uid = getuid (); } if (ioctl (pip -> fd, PIOCSSIG, sip) < 0) { print_sys_errmsg (pip -> pathname, errno); warning ("PIOCSSIG failed"); } } } /* GLOBAL FUNCTION child_resume -- resume execution of the inferior process SYNOPSIS void child_resume (int step, int signo) DESCRIPTION Resume execution of the inferior process. If STEP is nozero, then just single step it. If SIGNAL is nonzero, restart it with that signal activated. NOTE It may not be absolutely necessary to specify the PC value for restarting, but to be safe we use the value that gdb considers to be current. One case where this might be necessary is if the user explicitly changes the PC value that gdb considers to be current. FIXME: Investigate if this is necessary or not. When attaching to a child process, if we forced it to stop with a PIOCSTOP, then we will have set the nopass_next_sigstop flag. Upon resuming the first time after such a stop, we explicitly inhibit sending it another SIGSTOP, which would be the normal result of default signal handling. One potential drawback to this is that we will also ignore any attempt to by the user to explicitly continue after the attach with a SIGSTOP. Ultimately this problem should be dealt with by making the routines that deal with the inferior a little smarter, and possibly even allow an inferior to continue running at the same time as gdb. (FIXME?) */ void child_resume (step, signo) int step; int signo; { errno = 0; pi.prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT; #ifdef PRSVADDR_BROKEN /* Can't do this under Solaris running on a Sparc, as there seems to be no place to put nPC. In fact, if you use this, nPC seems to be set to some random garbage. We have to rely on the fact that PC and nPC have been written previously via PIOCSREG during a register flush. */ pi.prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; pi.prrun.pr_flags != PRSVADDR; #endif if (signo && !(signo == SIGSTOP && pi.nopass_next_sigstop)) { set_proc_siginfo (&pi, signo); } else { pi.prrun.pr_flags |= PRCSIG; } pi.nopass_next_sigstop = 0; if (step) { pi.prrun.pr_flags |= PRSTEP; } if (ioctl (pi.fd, PIOCRUN, &pi.prrun) != 0) { perror_with_name (pi.pathname); /* NOTREACHED */ } } /* GLOBAL FUNCTION fetch_inferior_registers -- fetch current registers from inferior SYNOPSIS void fetch_inferior_registers (int regno) DESCRIPTION Read the current values of the inferior's registers, both the general register set and floating point registers (if supported) and update gdb's idea of their current values. */ void fetch_inferior_registers (regno) int regno; { if (ioctl (pi.fd, PIOCGREG, &pi.gregset) != -1) { supply_gregset (&pi.gregset); } #if defined (FP0_REGNUM) if (ioctl (pi.fd, PIOCGFPREG, &pi.fpregset) != -1) { supply_fpregset (&pi.fpregset); } #endif } /* GLOBAL FUNCTION fetch_core_registers -- fetch current registers from core file data SYNOPSIS void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, unsigned in reg_addr) DESCRIPTION Read the values of either the general register set (WHICH equals 0) or the floating point register set (WHICH equals 2) from the core file data (pointed to by CORE_REG_SECT), and update gdb's idea of their current values. The CORE_REG_SIZE parameter is ignored. NOTES Use the indicated sizes to validate the gregset and fpregset structures. */ void fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) char *core_reg_sect; unsigned core_reg_size; int which; unsigned int reg_addr; /* Unused in this version */ { if (which == 0) { if (core_reg_size != sizeof (pi.gregset)) { warning ("wrong size gregset struct in core file"); } else { memcpy ((char *) &pi.gregset, core_reg_sect, sizeof (pi.gregset)); supply_gregset (&pi.gregset); } } else if (which == 2) { if (core_reg_size != sizeof (pi.fpregset)) { warning ("wrong size fpregset struct in core file"); } else { memcpy ((char *) &pi.fpregset, core_reg_sect, sizeof (pi.fpregset)); #if defined (FP0_REGNUM) supply_fpregset (&pi.fpregset); #endif } } } /* LOCAL FUNCTION proc_init_failed - called whenever /proc access initialization fails SYNOPSIS static void proc_init_failed (char *why) DESCRIPTION This function is called whenever initialization of access to a /proc entry fails. It prints a suitable error message, does some cleanup, and then invokes the standard error processing routine which dumps us back into the command loop. */ static void proc_init_failed (why) char *why; { print_sys_errmsg (pi.pathname, errno); kill (pi.pid, SIGKILL); close_proc_file (&pi); error (why); /* NOTREACHED */ } /* LOCAL FUNCTION close_proc_file - close any currently open /proc entry SYNOPSIS static void close_proc_file (struct procinfo *pip) DESCRIPTION Close any currently open /proc entry and mark the process information entry as invalid. In order to ensure that we don't try to reuse any stale information, the pid, fd, and pathnames are explicitly invalidated, which may be overkill. */ static void close_proc_file (pip) struct procinfo *pip; { pip -> pid = 0; if (pip -> valid) { close (pip -> fd); } pip -> fd = -1; if (pip -> pathname) { free (pip -> pathname); pip -> pathname = NULL; } pip -> valid = 0; } /* LOCAL FUNCTION open_proc_file - open a /proc entry for a given process id SYNOPSIS static int open_proc_file (int pid, struct procinfo *pip, int mode) DESCRIPTION Given a process id and a mode, close the existing open /proc entry (if any) and open one for the new process id, in the specified mode. Once it is open, then mark the local process information structure as valid, which guarantees that the pid, fd, and pathname fields match an open /proc entry. Returns zero if the open fails, nonzero otherwise. Note that the pathname is left intact, even when the open fails, so that callers can use it to construct meaningful error messages rather than just "file open failed". */ static int open_proc_file (pid, pip, mode) int pid; struct procinfo *pip; int mode; { pip -> valid = 0; /* FIXME, what is this? ?! */ if (pip -> valid) { close (pip -> fd); } if (pip -> pathname == NULL) { pip -> pathname = xmalloc (32); } sprintf (pip -> pathname, PROC_NAME_FMT, pid); if ((pip -> fd = open (pip -> pathname, mode)) >= 0) { pip -> valid = 1; pip -> pid = pid; } return (pip -> valid); } static char * mappingflags (flags) long flags; { static char asciiflags[8]; strcpy (asciiflags, "-------"); #if defined (MA_PHYS) if (flags & MA_PHYS) asciiflags[0] = 'd'; #endif if (flags & MA_STACK) asciiflags[1] = 's'; if (flags & MA_BREAK) asciiflags[2] = 'b'; if (flags & MA_SHARED) asciiflags[3] = 's'; if (flags & MA_READ) asciiflags[4] = 'r'; if (flags & MA_WRITE) asciiflags[5] = 'w'; if (flags & MA_EXEC) asciiflags[6] = 'x'; return (asciiflags); } static void info_proc_flags (pip, summary) struct procinfo *pip; int summary; { struct trans *transp; printf_filtered ("%-32s", "Process status flags:"); if (!summary) { printf_filtered ("\n\n"); } for (transp = pr_flag_table; transp -> name != NULL; transp++) { if (pip -> prstatus.pr_flags & transp -> value) { if (summary) { printf_filtered ("%s ", transp -> name); } else { printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc); } } } printf_filtered ("\n"); } static void info_proc_stop (pip, summary) struct procinfo *pip; int summary; { struct trans *transp; int why; int what; why = pip -> prstatus.pr_why; what = pip -> prstatus.pr_what; if (pip -> prstatus.pr_flags & PR_STOPPED) { printf_filtered ("%-32s", "Reason for stopping:"); if (!summary) { printf_filtered ("\n\n"); } for (transp = pr_why_table; transp -> name != NULL; transp++) { if (why == transp -> value) { if (summary) { printf_filtered ("%s ", transp -> name); } else { printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc); } break; } } /* Use the pr_why field to determine what the pr_what field means, and print more information. */ switch (why) { case PR_REQUESTED: /* pr_what is unused for this case */ break; case PR_JOBCONTROL: case PR_SIGNALLED: if (summary) { printf_filtered ("%s ", signalname (what)); } else { printf_filtered ("\t%-16s %s.\n", signalname (what), safe_strsignal (what)); } break; case PR_SYSENTRY: if (summary) { printf_filtered ("%s ", syscallname (what)); } else { printf_filtered ("\t%-16s %s.\n", syscallname (what), "Entered this system call"); } break; case PR_SYSEXIT: if (summary) { printf_filtered ("%s ", syscallname (what)); } else { printf_filtered ("\t%-16s %s.\n", syscallname (what), "Returned from this system call"); } break; case PR_FAULTED: if (summary) { printf_filtered ("%s ", lookupname (faults_table, what, "fault")); } else { printf_filtered ("\t%-16s %s.\n", lookupname (faults_table, what, "fault"), lookupdesc (faults_table, what)); } break; } printf_filtered ("\n"); } } static void info_proc_siginfo (pip, summary) struct procinfo *pip; int summary; { struct siginfo *sip; if ((pip -> prstatus.pr_flags & PR_STOPPED) && (pip -> prstatus.pr_why == PR_SIGNALLED || pip -> prstatus.pr_why == PR_FAULTED)) { printf_filtered ("%-32s", "Additional signal/fault info:"); sip = &pip -> prstatus.pr_info; if (summary) { printf_filtered ("%s ", signalname (sip -> si_signo)); if (sip -> si_errno > 0) { printf_filtered ("%s ", errnoname (sip -> si_errno)); } if (sip -> si_code <= 0) { printf_filtered ("sent by pid %d, uid %d ", sip -> si_pid, sip -> si_uid); } else { printf_filtered ("%s ", sigcodename (sip)); if ((sip -> si_signo == SIGILL) || (sip -> si_signo == SIGFPE) || (sip -> si_signo == SIGSEGV) || (sip -> si_signo == SIGBUS)) { printf_filtered ("addr=%#x ", sip -> si_addr); } else if ((sip -> si_signo == SIGCHLD)) { printf_filtered ("child pid %u, status %u ", sip -> si_pid, sip -> si_status); } else if ((sip -> si_signo == SIGPOLL)) { printf_filtered ("band %u ", sip -> si_band); } } } else { printf_filtered ("\n\n"); printf_filtered ("\t%-16s %s.\n", signalname (sip -> si_signo), safe_strsignal (sip -> si_signo)); if (sip -> si_errno > 0) { printf_filtered ("\t%-16s %s.\n", errnoname (sip -> si_errno), safe_strerror (sip -> si_errno)); } if (sip -> si_code <= 0) { printf_filtered ("\t%-16u %s\n", sip -> si_pid, "PID of process sending signal"); printf_filtered ("\t%-16u %s\n", sip -> si_uid, "UID of process sending signal"); } else { printf_filtered ("\t%-16s %s.\n", sigcodename (sip), sigcodedesc (sip)); if ((sip -> si_signo == SIGILL) || (sip -> si_signo == SIGFPE)) { printf_filtered ("\t%-16#x %s.\n", sip -> si_addr, "Address of faulting instruction"); } else if ((sip -> si_signo == SIGSEGV) || (sip -> si_signo == SIGBUS)) { printf_filtered ("\t%-16#x %s.\n", sip -> si_addr, "Address of faulting memory reference"); } else if ((sip -> si_signo == SIGCHLD)) { printf_filtered ("\t%-16u %s.\n", sip -> si_pid, "Child process ID"); printf_filtered ("\t%-16u %s.\n", sip -> si_status, "Child process exit value or signal"); } else if ((sip -> si_signo == SIGPOLL)) { printf_filtered ("\t%-16u %s.\n", sip -> si_band, "Band event for POLL_{IN,OUT,MSG}"); } } } printf_filtered ("\n"); } } static void info_proc_syscalls (pip, summary) struct procinfo *pip; int summary; { int syscallnum; if (!summary) { #if 0 /* FIXME: Needs to use gdb-wide configured info about system calls. */ if (pip -> prstatus.pr_flags & PR_ASLEEP) { int syscallnum = pip -> prstatus.pr_reg[R_D0]; if (summary) { printf_filtered ("%-32s", "Sleeping in system call:"); printf_filtered ("%s", syscallname (syscallnum)); } else { printf_filtered ("Sleeping in system call '%s'.\n", syscallname (syscallnum)); } } #endif if (ioctl (pip -> fd, PIOCGENTRY, &pip -> entryset) < 0) { print_sys_errmsg (pip -> pathname, errno); error ("PIOCGENTRY failed"); } if (ioctl (pip -> fd, PIOCGEXIT, &pip -> exitset) < 0) { print_sys_errmsg (pip -> pathname, errno); error ("PIOCGEXIT failed"); } printf_filtered ("System call tracing information:\n\n"); printf_filtered ("\t%-12s %-8s %-8s\n", "System call", "Entry", "Exit"); for (syscallnum = 0; syscallnum < MAX_SYSCALLS; syscallnum++) { QUIT; if (syscall_table[syscallnum] != NULL) { printf_filtered ("\t%-12s ", syscall_table[syscallnum]); printf_filtered ("%-8s ", prismember (&pip -> entryset, syscallnum) ? "on" : "off"); printf_filtered ("%-8s ", prismember (&pip -> exitset, syscallnum) ? "on" : "off"); printf_filtered ("\n"); } } printf_filtered ("\n"); } } static char * signalname (signo) int signo; { char *name; static char locbuf[32]; name = strsigno (signo); if (name == NULL) { sprintf (locbuf, "Signal %d", signo); } else { sprintf (locbuf, "%s (%d)", name, signo); } return (locbuf); } static char * errnoname (errnum) int errnum; { char *name; static char locbuf[32]; name = strerrno (errnum); if (name == NULL) { sprintf (locbuf, "Errno %d", errnum); } else { sprintf (locbuf, "%s (%d)", name, errnum); } return (locbuf); } static void info_proc_signals (pip, summary) struct procinfo *pip; int summary; { int signo; if (!summary) { if (ioctl (pip -> fd, PIOCGTRACE, &pip -> trace) < 0) { print_sys_errmsg (pip -> pathname, errno); error ("PIOCGTRACE failed"); } printf_filtered ("Disposition of signals:\n\n"); printf_filtered ("\t%-15s %-8s %-8s %-8s %s\n\n", "Signal", "Trace", "Hold", "Pending", "Description"); for (signo = 0; signo < NSIG; signo++) { QUIT; printf_filtered ("\t%-15s ", signalname (signo)); printf_filtered ("%-8s ", prismember (&pip -> trace, signo) ? "on" : "off"); printf_filtered ("%-8s ", prismember (&pip -> prstatus.pr_sighold, signo) ? "on" : "off"); printf_filtered ("%-8s ", prismember (&pip -> prstatus.pr_sigpend, signo) ? "yes" : "no"); printf_filtered (" %s\n", safe_strsignal (signo)); } printf_filtered ("\n"); } } static void info_proc_faults (pip, summary) struct procinfo *pip; int summary; { struct trans *transp; if (!summary) { if (ioctl (pip -> fd, PIOCGFAULT, &pip -> fltset) < 0) { print_sys_errmsg (pip -> pathname, errno); error ("PIOCGFAULT failed"); } printf_filtered ("Current traced hardware fault set:\n\n"); printf_filtered ("\t%-12s %-8s\n", "Fault", "Trace"); for (transp = faults_table; transp -> name != NULL; transp++) { QUIT; printf_filtered ("\t%-12s ", transp -> name); printf_filtered ("%-8s", prismember (&pip -> fltset, transp -> value) ? "on" : "off"); printf_filtered ("\n"); } printf_filtered ("\n"); } } static void info_proc_mappings (pip, summary) struct procinfo *pip; int summary; { int nmap; struct prmap *prmaps; struct prmap *prmap; if (!summary) { printf_filtered ("Mapped address spaces:\n\n"); printf_filtered ("\t%10s %10s %10s %10s %7s\n", "Start Addr", " End Addr", " Size", " Offset", "Flags"); if (ioctl (pip -> fd, PIOCNMAP, &nmap) == 0) { prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps)); if (ioctl (pip -> fd, PIOCMAP, prmaps) == 0) { for (prmap = prmaps; prmap -> pr_size; ++prmap) { printf_filtered ("\t%#10x %#10x %#10x %#10x %7s\n", prmap -> pr_vaddr, prmap -> pr_vaddr + prmap -> pr_size - 1, prmap -> pr_size, prmap -> pr_off, mappingflags (prmap -> pr_mflags)); } } } printf_filtered ("\n"); } } /* LOCAL FUNCTION info_proc -- implement the "info proc" command SYNOPSIS void info_proc (char *args, int from_tty) DESCRIPTION Implement gdb's "info proc" command by using the /proc interface to print status information about any currently running process. Examples of the use of "info proc" are: info proc (prints summary info for current inferior) info proc 123 (prints summary info for process with pid 123) info proc mappings (prints address mappings) info proc times (prints process/children times) info proc id (prints pid, ppid, gid, sid, etc) info proc status (prints general process state info) info proc signals (prints info about signal handling) info proc all (prints all info) */ static void info_proc (args, from_tty) char *args; int from_tty; { int pid; struct procinfo pii; struct procinfo *pip; struct cleanup *old_chain; char **argv; int argsize; int summary = 1; int flags = 0; int syscalls = 0; int signals = 0; int faults = 0; int mappings = 0; int times = 0; int id = 0; int status = 0; int all = 0; old_chain = make_cleanup (null_cleanup, 0); /* Default to using the current inferior if no pid specified */ pip = π if (args != NULL) { if ((argv = buildargv (args)) == NULL) { nomem (0); } make_cleanup (freeargv, (char *) argv); while (*argv != NULL) { argsize = strlen (*argv); if (argsize >= 1 && strncmp (*argv, "all", argsize) == 0) { summary = 0; all = 1; } else if (argsize >= 2 && strncmp (*argv, "faults", argsize) == 0) { summary = 0; faults = 1; } else if (argsize >= 2 && strncmp (*argv, "flags", argsize) == 0) { summary = 0; flags = 1; } else if (argsize >= 1 && strncmp (*argv, "id", argsize) == 0) { summary = 0; id = 1; } else if (argsize >= 1 && strncmp (*argv, "mappings", argsize) == 0) { summary = 0; mappings = 1; } else if (argsize >= 2 && strncmp (*argv, "signals", argsize) == 0) { summary = 0; signals = 1; } else if (argsize >= 2 && strncmp (*argv, "status", argsize) == 0) { summary = 0; status = 1; } else if (argsize >= 2 && strncmp (*argv, "syscalls", argsize) == 0) { summary = 0; syscalls = 1; } else if (argsize >= 1 && strncmp (*argv, "times", argsize) == 0) { summary = 0; times = 1; } else if ((pii.pid = atoi (*argv)) > 0) { pid = pii.pid; pip = &pii; memset (&pii, 0, sizeof (pii)); if (!open_proc_file (pid, pip, O_RDONLY)) { perror_with_name (pip -> pathname); /* NOTREACHED */ } make_cleanup (close_proc_file, pip); } else if (**argv != '\000') { error ("Unrecognized or ambiguous keyword `%s'.", *argv); } argv++; } } /* If we don't have a valid open process at this point, then we have no inferior or didn't specify a specific pid. */ if (!pip -> valid) { error ("No process. Run an inferior or specify an explicit pid."); } if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0) { print_sys_errmsg (pip -> pathname, errno); error ("PIOCSTATUS failed"); } /* Print verbose information of the requested type(s), or just a summary of the information for all types. */ printf_filtered ("\nInformation for %s:\n\n", pip -> pathname); if (summary || all || flags) { info_proc_flags (pip, summary); } if (summary || all) { info_proc_stop (pip, summary); } if (summary || all || signals || faults) { info_proc_siginfo (pip, summary); } if (summary || all || syscalls) { info_proc_syscalls (pip, summary); } if (summary || all || mappings) { info_proc_mappings (pip, summary); } if (summary || all || signals) { info_proc_signals (pip, summary); } if (summary || all || faults) { info_proc_faults (pip, summary); } printf_filtered ("\n"); /* All done, deal with closing any temporary process info structure, freeing temporary memory , etc. */ do_cleanups (old_chain); } /* GLOBAL FUNCTION _initialize_proc_fs -- initialize the process file system stuff SYNOPSIS void _initialize_proc_fs (void) DESCRIPTION Do required initializations during gdb startup for using the /proc file system interface. */ static char *proc_desc = "Show process status information using /proc entry.\n\ Specify process id or use current inferior by default.\n\ Specify keywords for detailed information; default is summary.\n\ Keywords are: `all', `faults', `flags', `id', `mappings', `signals',\n\ `status', `syscalls', and `times'.\n\ Unambiguous abbreviations may be used."; void _initialize_proc_fs () { add_info ("proc", info_proc, proc_desc); init_syscall_table (); } #endif /* USE_PROC_FS */