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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [auxv.c] - Blame information for rev 157

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1 24 jeremybenn
/* Auxiliary vector support for GDB, the GNU debugger.
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   Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "target.h"
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#include "gdbtypes.h"
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#include "command.h"
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#include "inferior.h"
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#include "valprint.h"
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#include "gdb_assert.h"
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#include "auxv.h"
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#include "elf/common.h"
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#include <unistd.h>
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#include <fcntl.h>
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/* This function is called like a to_xfer_partial hook,
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   but must be called with TARGET_OBJECT_AUXV.
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   It handles access via /proc/PID/auxv, which is the common method.
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   This function is appropriate for doing:
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           #define NATIVE_XFER_AUXV     procfs_xfer_auxv
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   for a native target that uses inftarg.c's child_xfer_partial hook.  */
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LONGEST
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procfs_xfer_auxv (struct target_ops *ops,
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                  int /* enum target_object */ object,
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                  const char *annex,
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                  gdb_byte *readbuf,
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                  const gdb_byte *writebuf,
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                  ULONGEST offset,
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                  LONGEST len)
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{
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  char *pathname;
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  int fd;
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  LONGEST n;
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  gdb_assert (object == TARGET_OBJECT_AUXV);
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  gdb_assert (readbuf || writebuf);
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  pathname = xstrprintf ("/proc/%d/auxv", PIDGET (inferior_ptid));
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  fd = open (pathname, writebuf != NULL ? O_WRONLY : O_RDONLY);
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  xfree (pathname);
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  if (fd < 0)
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    return -1;
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  if (offset != (ULONGEST) 0
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      && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
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    n = -1;
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  else if (readbuf != NULL)
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    n = read (fd, readbuf, len);
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  else
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    n = write (fd, writebuf, len);
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  (void) close (fd);
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  return n;
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}
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/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
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   Return 0 if *READPTR is already at the end of the buffer.
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   Return -1 if there is insufficient buffer for a whole entry.
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   Return 1 if an entry was read into *TYPEP and *VALP.  */
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int
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target_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
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                   gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
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{
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  const int sizeof_auxv_field = TYPE_LENGTH (builtin_type_void_data_ptr);
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  gdb_byte *ptr = *readptr;
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  if (endptr == ptr)
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    return 0;
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  if (endptr - ptr < sizeof_auxv_field * 2)
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    return -1;
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  *typep = extract_unsigned_integer (ptr, sizeof_auxv_field);
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  ptr += sizeof_auxv_field;
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  *valp = extract_unsigned_integer (ptr, sizeof_auxv_field);
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  ptr += sizeof_auxv_field;
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  *readptr = ptr;
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  return 1;
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}
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/* Extract the auxiliary vector entry with a_type matching MATCH.
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   Return zero if no such entry was found, or -1 if there was
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   an error getting the information.  On success, return 1 after
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   storing the entry's value field in *VALP.  */
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int
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target_auxv_search (struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp)
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{
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  CORE_ADDR type, val;
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  gdb_byte *data;
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  LONGEST n = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL, &data);
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  gdb_byte *ptr = data;
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  int ents = 0;
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  if (n <= 0)
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    return n;
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  while (1)
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    switch (target_auxv_parse (ops, &ptr, data + n, &type, &val))
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      {
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      case 1:                   /* Here's an entry, check it.  */
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        if (type == match)
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          {
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            xfree (data);
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            *valp = val;
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            return 1;
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          }
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        break;
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      case 0:                    /* End of the vector.  */
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        xfree (data);
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        return 0;
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      default:                  /* Bogosity.  */
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        xfree (data);
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        return -1;
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      }
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  /*NOTREACHED*/
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}
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/* Print the contents of the target's AUXV on the specified file. */
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int
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fprint_target_auxv (struct ui_file *file, struct target_ops *ops)
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{
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  CORE_ADDR type, val;
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  gdb_byte *data;
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  LONGEST len = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL,
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                                   &data);
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  gdb_byte *ptr = data;
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  int ents = 0;
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  if (len <= 0)
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    return len;
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  while (target_auxv_parse (ops, &ptr, data + len, &type, &val) > 0)
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    {
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      extern int addressprint;
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      const char *name = "???";
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      const char *description = "";
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      enum { dec, hex, str } flavor = hex;
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      switch (type)
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        {
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#define TAG(tag, text, kind) \
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        case tag: name = #tag; description = text; flavor = kind; break
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          TAG (AT_NULL, _("End of vector"), hex);
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          TAG (AT_IGNORE, _("Entry should be ignored"), hex);
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          TAG (AT_EXECFD, _("File descriptor of program"), dec);
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          TAG (AT_PHDR, _("Program headers for program"), hex);
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          TAG (AT_PHENT, _("Size of program header entry"), dec);
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          TAG (AT_PHNUM, _("Number of program headers"), dec);
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          TAG (AT_PAGESZ, _("System page size"), dec);
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          TAG (AT_BASE, _("Base address of interpreter"), hex);
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          TAG (AT_FLAGS, _("Flags"), hex);
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          TAG (AT_ENTRY, _("Entry point of program"), hex);
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          TAG (AT_NOTELF, _("Program is not ELF"), dec);
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          TAG (AT_UID, _("Real user ID"), dec);
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          TAG (AT_EUID, _("Effective user ID"), dec);
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          TAG (AT_GID, _("Real group ID"), dec);
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          TAG (AT_EGID, _("Effective group ID"), dec);
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          TAG (AT_CLKTCK, _("Frequency of times()"), dec);
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          TAG (AT_PLATFORM, _("String identifying platform"), str);
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          TAG (AT_HWCAP, _("Machine-dependent CPU capability hints"), hex);
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          TAG (AT_FPUCW, _("Used FPU control word"), dec);
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          TAG (AT_DCACHEBSIZE, _("Data cache block size"), dec);
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          TAG (AT_ICACHEBSIZE, _("Instruction cache block size"), dec);
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          TAG (AT_UCACHEBSIZE, _("Unified cache block size"), dec);
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          TAG (AT_IGNOREPPC, _("Entry should be ignored"), dec);
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          TAG (AT_SYSINFO, _("Special system info/entry points"), hex);
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          TAG (AT_SYSINFO_EHDR, _("System-supplied DSO's ELF header"), hex);
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          TAG (AT_SECURE, _("Boolean, was exec setuid-like?"), dec);
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          TAG (AT_SUN_UID, _("Effective user ID"), dec);
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          TAG (AT_SUN_RUID, _("Real user ID"), dec);
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          TAG (AT_SUN_GID, _("Effective group ID"), dec);
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          TAG (AT_SUN_RGID, _("Real group ID"), dec);
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          TAG (AT_SUN_LDELF, _("Dynamic linker's ELF header"), hex);
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          TAG (AT_SUN_LDSHDR, _("Dynamic linker's section headers"), hex);
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          TAG (AT_SUN_LDNAME, _("String giving name of dynamic linker"), str);
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          TAG (AT_SUN_LPAGESZ, _("Large pagesize"), dec);
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          TAG (AT_SUN_PLATFORM, _("Platform name string"), str);
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          TAG (AT_SUN_HWCAP, _("Machine-dependent CPU capability hints"), hex);
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          TAG (AT_SUN_IFLUSH, _("Should flush icache?"), dec);
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          TAG (AT_SUN_CPU, _("CPU name string"), str);
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          TAG (AT_SUN_EMUL_ENTRY, _("COFF entry point address"), hex);
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          TAG (AT_SUN_EMUL_EXECFD, _("COFF executable file descriptor"), dec);
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          TAG (AT_SUN_EXECNAME,
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               _("Canonicalized file name given to execve"), str);
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          TAG (AT_SUN_MMU, _("String for name of MMU module"), str);
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          TAG (AT_SUN_LDDATA, _("Dynamic linker's data segment address"), hex);
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          TAG (AT_SUN_AUXFLAGS,
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               _("AF_SUN_ flags passed from the kernel"), hex);
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        }
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      fprintf_filtered (file, "%-4s %-20s %-30s ",
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                        paddr_d (type), name, description);
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      switch (flavor)
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        {
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        case dec:
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          fprintf_filtered (file, "%s\n", paddr_d (val));
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          break;
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        case hex:
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          fprintf_filtered (file, "0x%s\n", paddr_nz (val));
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          break;
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        case str:
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          if (addressprint)
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            fprintf_filtered (file, "0x%s", paddr_nz (val));
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          val_print_string (val, -1, 1, file);
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          fprintf_filtered (file, "\n");
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          break;
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        }
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      ++ents;
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    }
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  xfree (data);
236
 
237
  return ents;
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}
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static void
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info_auxv_command (char *cmd, int from_tty)
242
{
243
  if (! target_has_stack)
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    error (_("The program has no auxiliary information now."));
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  else
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    {
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      int ents = fprint_target_auxv (gdb_stdout, &current_target);
248
      if (ents < 0)
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        error (_("No auxiliary vector found, or failed reading it."));
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      else if (ents == 0)
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        error (_("Auxiliary vector is empty."));
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    }
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}
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extern initialize_file_ftype _initialize_auxv; /* -Wmissing-prototypes; */
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258
void
259
_initialize_auxv (void)
260
{
261
  add_info ("auxv", info_auxv_command,
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            _("Display the inferior's auxiliary vector.\n\
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This is information provided by the operating system at program startup."));
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}

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