diff options
Diffstat (limited to 'gdb/linux-proc.c')
| -rw-r--r-- | gdb/linux-proc.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/gdb/linux-proc.c b/gdb/linux-proc.c new file mode 100644 index 0000000..0a77459 --- /dev/null +++ b/gdb/linux-proc.c @@ -0,0 +1,737 @@ +/* GNU/Linux specific methods for using the /proc file system. + + Copyright 2001, 2002 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 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. */ + +#include "defs.h" +#include "inferior.h" +#include <sys/param.h> /* for MAXPATHLEN */ +#include <sys/procfs.h> /* for elf_gregset etc. */ +#include "gdb_stat.h" /* for struct stat */ +#include <ctype.h> /* for isdigit */ +#include <unistd.h> /* for open, pread64 */ +#include <fcntl.h> /* for O_RDONLY */ +#include "regcache.h" /* for registers_changed */ +#include "gregset.h" /* for gregset */ +#include "gdbcore.h" /* for get_exec_file */ +#include "gdbthread.h" /* for struct thread_info etc. */ +#include "elf-bfd.h" /* for elfcore_write_* */ +#include "cli/cli-decode.h" /* for add_info */ +#include "gdb_string.h" + +#include <signal.h> + +#include "linux-nat.h" + +#ifndef O_LARGEFILE +#define O_LARGEFILE 0 +#endif + +/* Function: child_pid_to_exec_file + * + * Accepts an integer pid + * Returns a string representing a file that can be opened + * to get the symbols for the child process. + */ + +char * +child_pid_to_exec_file (int pid) +{ + char *name1, *name2; + + name1 = xmalloc (MAXPATHLEN); + name2 = xmalloc (MAXPATHLEN); + make_cleanup (xfree, name1); + make_cleanup (xfree, name2); + memset (name2, 0, MAXPATHLEN); + + sprintf (name1, "/proc/%d/exe", pid); + if (readlink (name1, name2, MAXPATHLEN) > 0) + return name2; + else + return name1; +} + +/* Function: read_mappings + * + * Service function for corefiles and info proc. + */ + +static int +read_mapping (FILE *mapfile, + long long *addr, + long long *endaddr, + char *permissions, + long long *offset, + char *device, long long *inode, char *filename) +{ + int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", + addr, endaddr, permissions, offset, device, inode); + + if (ret > 0 && ret != EOF && *inode != 0) + { + /* Eat everything up to EOL for the filename. This will prevent + weird filenames (such as one with embedded whitespace) from + confusing this code. It also makes this code more robust + in respect to annotations the kernel may add after the + filename. + + Note the filename is used for informational purposes only. */ + ret += fscanf (mapfile, "%[^\n]\n", filename); + } + else + { + filename[0] = '\0'; /* no filename */ + fscanf (mapfile, "\n"); + } + return (ret != 0 && ret != EOF); +} + +/* Function: linux_find_memory_regions + * + * Fills the "to_find_memory_regions" target vector. + * Lists the memory regions in the inferior for a corefile. + */ + +static int +linux_find_memory_regions (int (*func) (CORE_ADDR, + unsigned long, + int, int, int, void *), void *obfd) +{ + long long pid = PIDGET (inferior_ptid); + char mapsfilename[MAXPATHLEN]; + FILE *mapsfile; + long long addr, endaddr, size, offset, inode; + char permissions[8], device[8], filename[MAXPATHLEN]; + int read, write, exec; + int ret; + + /* Compose the filename for the /proc memory map, and open it. */ + sprintf (mapsfilename, "/proc/%lld/maps", pid); + if ((mapsfile = fopen (mapsfilename, "r")) == NULL) + error ("Could not open %s\n", mapsfilename); + + if (info_verbose) + fprintf_filtered (gdb_stdout, + "Reading memory regions from %s\n", mapsfilename); + + /* Now iterate until end-of-file. */ + while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], + &offset, &device[0], &inode, &filename[0])) + { + size = endaddr - addr; + + /* Get the segment's permissions. */ + read = (strchr (permissions, 'r') != 0); + write = (strchr (permissions, 'w') != 0); + exec = (strchr (permissions, 'x') != 0); + + if (info_verbose) + { + fprintf_filtered (gdb_stdout, + "Save segment, %lld bytes at 0x%s (%c%c%c)", + size, paddr_nz (addr), + read ? 'r' : ' ', + write ? 'w' : ' ', exec ? 'x' : ' '); + if (filename && filename[0]) + fprintf_filtered (gdb_stdout, " for %s", filename); + fprintf_filtered (gdb_stdout, "\n"); + } + + /* Invoke the callback function to create the corefile segment. */ + func (addr, size, read, write, exec, obfd); + } + fclose (mapsfile); + return 0; +} + +/* Function: linux_do_thread_registers + * + * Records the thread's register state for the corefile note section. + */ + +static char * +linux_do_thread_registers (bfd *obfd, ptid_t ptid, + char *note_data, int *note_size) +{ + gdb_gregset_t gregs; + gdb_fpregset_t fpregs; +#ifdef FILL_FPXREGSET + gdb_fpxregset_t fpxregs; +#endif + unsigned long lwp = ptid_get_lwp (ptid); + + fill_gregset (&gregs, -1); + note_data = (char *) elfcore_write_prstatus (obfd, + note_data, + note_size, + lwp, + stop_signal, &gregs); + + fill_fpregset (&fpregs, -1); + note_data = (char *) elfcore_write_prfpreg (obfd, + note_data, + note_size, + &fpregs, sizeof (fpregs)); +#ifdef FILL_FPXREGSET + fill_fpxregset (&fpxregs, -1); + note_data = (char *) elfcore_write_prxfpreg (obfd, + note_data, + note_size, + &fpxregs, sizeof (fpxregs)); +#endif + return note_data; +} + +struct linux_corefile_thread_data +{ + bfd *obfd; + char *note_data; + int *note_size; + int num_notes; +}; + +/* Function: linux_corefile_thread_callback + * + * Called by gdbthread.c once per thread. + * Records the thread's register state for the corefile note section. + */ + +static int +linux_corefile_thread_callback (struct lwp_info *ti, void *data) +{ + struct linux_corefile_thread_data *args = data; + ptid_t saved_ptid = inferior_ptid; + + inferior_ptid = ti->ptid; + registers_changed (); + target_fetch_registers (-1); /* FIXME should not be necessary; + fill_gregset should do it automatically. */ + args->note_data = linux_do_thread_registers (args->obfd, + ti->ptid, + args->note_data, + args->note_size); + args->num_notes++; + inferior_ptid = saved_ptid; + registers_changed (); + target_fetch_registers (-1); /* FIXME should not be necessary; + fill_gregset should do it automatically. */ + return 0; +} + +/* Function: linux_do_registers + * + * Records the register state for the corefile note section. + */ + +static char * +linux_do_registers (bfd *obfd, ptid_t ptid, + char *note_data, int *note_size) +{ + registers_changed (); + target_fetch_registers (-1); /* FIXME should not be necessary; + fill_gregset should do it automatically. */ + return linux_do_thread_registers (obfd, + ptid_build (ptid_get_pid (inferior_ptid), + ptid_get_pid (inferior_ptid), + 0), + note_data, note_size); + return note_data; +} + +/* Function: linux_make_note_section + * + * Fills the "to_make_corefile_note" target vector. + * Builds the note section for a corefile, and returns it + * in a malloc buffer. + */ + +static char * +linux_make_note_section (bfd *obfd, int *note_size) +{ + struct linux_corefile_thread_data thread_args; + struct cleanup *old_chain; + char fname[16] = { '\0' }; + char psargs[80] = { '\0' }; + char *note_data = NULL; + ptid_t current_ptid = inferior_ptid; + char *auxv; + int auxv_len; + + if (get_exec_file (0)) + { + strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); + strncpy (psargs, get_exec_file (0), sizeof (psargs)); + if (get_inferior_args ()) + { + strncat (psargs, " ", sizeof (psargs) - strlen (psargs)); + strncat (psargs, get_inferior_args (), + sizeof (psargs) - strlen (psargs)); + } + note_data = (char *) elfcore_write_prpsinfo (obfd, + note_data, + note_size, fname, psargs); + } + + /* Dump information for threads. */ + thread_args.obfd = obfd; + thread_args.note_data = note_data; + thread_args.note_size = note_size; + thread_args.num_notes = 0; + iterate_over_lwps (linux_corefile_thread_callback, &thread_args); + if (thread_args.num_notes == 0) + { + /* iterate_over_threads didn't come up with any threads; + just use inferior_ptid. */ + note_data = linux_do_registers (obfd, inferior_ptid, + note_data, note_size); + } + else + { + note_data = thread_args.note_data; + } + + auxv_len = target_auxv_read (¤t_target, &auxv); + if (auxv_len > 0) + { + note_data = elfcore_write_note (obfd, note_data, note_size, + "CORE", NT_AUXV, auxv, auxv_len); + xfree (auxv); + } + + make_cleanup (xfree, note_data); + return note_data; +} + +/* + * Function: linux_info_proc_cmd + * + * Implement the "info proc" command. + */ + +static void +linux_info_proc_cmd (char *args, int from_tty) +{ + long long pid = PIDGET (inferior_ptid); + FILE *procfile; + char **argv = NULL; + char buffer[MAXPATHLEN]; + char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; + int cmdline_f = 1; + int cwd_f = 1; + int exe_f = 1; + int mappings_f = 0; + int environ_f = 0; + int status_f = 0; + int stat_f = 0; + int all = 0; + struct stat dummy; + + if (args) + { + /* Break up 'args' into an argv array. */ + if ((argv = buildargv (args)) == NULL) + nomem (0); + else + make_cleanup_freeargv (argv); + } + while (argv != NULL && *argv != NULL) + { + if (isdigit (argv[0][0])) + { + pid = strtoul (argv[0], NULL, 10); + } + else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) + { + mappings_f = 1; + } + else if (strcmp (argv[0], "status") == 0) + { + status_f = 1; + } + else if (strcmp (argv[0], "stat") == 0) + { + stat_f = 1; + } + else if (strcmp (argv[0], "cmd") == 0) + { + cmdline_f = 1; + } + else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) + { + exe_f = 1; + } + else if (strcmp (argv[0], "cwd") == 0) + { + cwd_f = 1; + } + else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) + { + all = 1; + } + else + { + /* [...] (future options here) */ + } + argv++; + } + if (pid == 0) + error ("No current process: you must name one."); + + sprintf (fname1, "/proc/%lld", pid); + if (stat (fname1, &dummy) != 0) + error ("No /proc directory: '%s'", fname1); + + printf_filtered ("process %lld\n", pid); + if (cmdline_f || all) + { + sprintf (fname1, "/proc/%lld/cmdline", pid); + if ((procfile = fopen (fname1, "r")) > 0) + { + fgets (buffer, sizeof (buffer), procfile); + printf_filtered ("cmdline = '%s'\n", buffer); + fclose (procfile); + } + else + warning ("unable to open /proc file '%s'", fname1); + } + if (cwd_f || all) + { + sprintf (fname1, "/proc/%lld/cwd", pid); + memset (fname2, 0, sizeof (fname2)); + if (readlink (fname1, fname2, sizeof (fname2)) > 0) + printf_filtered ("cwd = '%s'\n", fname2); + else + warning ("unable to read link '%s'", fname1); + } + if (exe_f || all) + { + sprintf (fname1, "/proc/%lld/exe", pid); + memset (fname2, 0, sizeof (fname2)); + if (readlink (fname1, fname2, sizeof (fname2)) > 0) + printf_filtered ("exe = '%s'\n", fname2); + else + warning ("unable to read link '%s'", fname1); + } + if (mappings_f || all) + { + sprintf (fname1, "/proc/%lld/maps", pid); + if ((procfile = fopen (fname1, "r")) > 0) + { + long long addr, endaddr, size, offset, inode; + char permissions[8], device[8], filename[MAXPATHLEN]; + + printf_filtered ("Mapped address spaces:\n\n"); + if (TARGET_ADDR_BIT == 32) + { + printf_filtered ("\t%10s %10s %10s %10s %7s\n", + "Start Addr", + " End Addr", + " Size", " Offset", "objfile"); + } + else + { + printf_filtered (" %18s %18s %10s %10s %7s\n", + "Start Addr", + " End Addr", + " Size", " Offset", "objfile"); + } + + while (read_mapping (procfile, &addr, &endaddr, &permissions[0], + &offset, &device[0], &inode, &filename[0])) + { + size = endaddr - addr; + + /* FIXME: carlton/2003-08-27: Maybe the printf_filtered + calls here (and possibly above) should be abstracted + out into their own functions? Andrew suggests using + a generic local_address_string instead to print out + the addresses; that makes sense to me, too. */ + + if (TARGET_ADDR_BIT == 32) + { + printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", + (unsigned long) addr, /* FIXME: pr_addr */ + (unsigned long) endaddr, + (int) size, + (unsigned int) offset, + filename[0] ? filename : ""); + } + else + { + printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", + (unsigned long) addr, /* FIXME: pr_addr */ + (unsigned long) endaddr, + (int) size, + (unsigned int) offset, + filename[0] ? filename : ""); + } + } + + fclose (procfile); + } + else + warning ("unable to open /proc file '%s'", fname1); + } + if (status_f || all) + { + sprintf (fname1, "/proc/%lld/status", pid); + if ((procfile = fopen (fname1, "r")) > 0) + { + while (fgets (buffer, sizeof (buffer), procfile) != NULL) + puts_filtered (buffer); + fclose (procfile); + } + else + warning ("unable to open /proc file '%s'", fname1); + } + if (stat_f || all) + { + sprintf (fname1, "/proc/%lld/stat", pid); + if ((procfile = fopen (fname1, "r")) > 0) + { + int itmp; + char ctmp; + + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Process: %d\n", itmp); + if (fscanf (procfile, "%s ", &buffer[0]) > 0) + printf_filtered ("Exec file: %s\n", buffer); + if (fscanf (procfile, "%c ", &ctmp) > 0) + printf_filtered ("State: %c\n", ctmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Parent process: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Process group: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Session id: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("TTY: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("TTY owner process group: %d\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Flags: 0x%x\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Minor faults (no memory page): %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Minor faults, children: %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Major faults (memory page faults): %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Major faults, children: %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("utime: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("stime: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("utime, children: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("stime, children: %d\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("jiffies remaining in current time slice: %d\n", + itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("'nice' value: %d\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("jiffies until next timeout: %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("jiffies until next SIGALRM: %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("start time (jiffies since system boot): %d\n", + itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Virtual memory size: %u\n", + (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Resident set size: %u\n", (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("rlim: %u\n", (unsigned int) itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Start of text: 0x%x\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("End of text: 0x%x\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) + printf_filtered ("Start of stack: 0x%x\n", itmp); +#if 0 /* Don't know how architecture-dependent the rest is... + Anyway the signal bitmap info is available from "status". */ + if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ + printf_filtered ("Kernel stack pointer: 0x%x\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ + printf_filtered ("Kernel instr pointer: 0x%x\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Pending signals bitmap: 0x%x\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Blocked signals bitmap: 0x%x\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Ignored signals bitmap: 0x%x\n", itmp); + if (fscanf (procfile, "%d ", &itmp) > 0) + printf_filtered ("Catched signals bitmap: 0x%x\n", itmp); + if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ + printf_filtered ("wchan (system call): 0x%x\n", itmp); +#endif + fclose (procfile); + } + else + warning ("unable to open /proc file '%s'", fname1); + } +} + +void +_initialize_linux_proc (void) +{ + extern void inftarg_set_find_memory_regions (); + extern void inftarg_set_make_corefile_notes (); + + inftarg_set_find_memory_regions (linux_find_memory_regions); + inftarg_set_make_corefile_notes (linux_make_note_section); + + add_info ("proc", linux_info_proc_cmd, + "Show /proc process information about any running process.\n\ +Specify any process id, or use the program being debugged by default.\n\ +Specify any of the following keywords for detailed info:\n\ + mappings -- list of mapped memory regions.\n\ + stat -- list a bunch of random process info.\n\ + status -- list a different bunch of random process info.\n\ + all -- list all available /proc info."); +} + +int +linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len, int write, + struct mem_attrib *attrib, struct target_ops *target) +{ + int fd, ret; + char filename[64]; + + if (write) + return 0; + + /* Don't bother for one word. */ + if (len < 3 * sizeof (long)) + return 0; + + /* We could keep this file open and cache it - possibly one + per thread. That requires some juggling, but is even faster. */ + sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); + fd = open (filename, O_RDONLY | O_LARGEFILE); + if (fd == -1) + return 0; + + /* If pread64 is available, use it. It's faster if the kernel + supports it (only one syscall), and it's 64-bit safe even + on 32-bit platforms (for instance, SPARC debugging a SPARC64 + application). */ +#ifdef HAVE_PREAD64 + if (pread64 (fd, myaddr, len, addr) != len) +#else + if (lseek (fd, addr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) +#endif + ret = 0; + else + ret = len; + + close (fd); + return ret; +} + +/* Parse LINE as a signal set and add its set bits to SIGS. */ + +static void +linux_proc_add_line_to_sigset (const char *line, sigset_t *sigs) +{ + int len = strlen (line) - 1; + const char *p; + int signum; + + if (line[len] != '\n') + error ("Could not parse signal set: %s", line); + + p = line; + signum = len * 4; + while (len-- > 0) + { + int digit; + + if (*p >= '0' && *p <= '9') + digit = *p - '0'; + else if (*p >= 'a' && *p <= 'f') + digit = *p - 'a' + 10; + else + error ("Could not parse signal set: %s", line); + + signum -= 4; + + if (digit & 1) + sigaddset (sigs, signum + 1); + if (digit & 2) + sigaddset (sigs, signum + 2); + if (digit & 4) + sigaddset (sigs, signum + 3); + if (digit & 8) + sigaddset (sigs, signum + 4); + + p++; + } +} + +/* Find process PID's pending signals from /proc/pid/status and set SIGS + to match. */ + +void +linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) +{ + FILE *procfile; + char buffer[MAXPATHLEN], fname[MAXPATHLEN]; + int signum; + + sigemptyset (pending); + sigemptyset (blocked); + sigemptyset (ignored); + sprintf (fname, "/proc/%d/status", pid); + procfile = fopen (fname, "r"); + if (procfile == NULL) + error ("Could not open %s", fname); + + while (fgets (buffer, MAXPATHLEN, procfile) != NULL) + { + /* Normal queued signals are on the SigPnd line in the status + file. However, 2.6 kernels also have a "shared" pending queue + for delivering signals to a thread group, so check for a ShdPnd + line also. + + Unfortunately some Red Hat kernels include the shared pending queue + but not the ShdPnd status field. */ + + if (strncmp (buffer, "SigPnd:\t", 8) == 0) + linux_proc_add_line_to_sigset (buffer + 8, pending); + else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) + linux_proc_add_line_to_sigset (buffer + 8, pending); + else if (strncmp (buffer, "SigBlk:\t", 8) == 0) + linux_proc_add_line_to_sigset (buffer + 8, blocked); + else if (strncmp (buffer, "SigIgn:\t", 8) == 0) + linux_proc_add_line_to_sigset (buffer + 8, ignored); + } + + fclose (procfile); +} |