290 lines
9.0 KiB
C
290 lines
9.0 KiB
C
/* Auxiliary vector support for GDB, the GNU debugger.
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Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
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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, but must be
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called with TARGET_OBJECT_AUXV. It handles access via
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/proc/PID/auxv, which is a common method for native targets. */
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LONGEST
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procfs_xfer_auxv (struct target_ops *ops,
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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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static int
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default_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 = gdbarch_ptr_bit (target_gdbarch)
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/ TARGET_CHAR_BIT;
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const enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
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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, byte_order);
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ptr += sizeof_auxv_field;
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*valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
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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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/* 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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struct target_ops *t;
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for (t = ops; t != NULL; t = t->beneath)
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if (t->to_auxv_parse != NULL)
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return t->to_auxv_parse (t, readptr, endptr, typep, valp);
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return default_auxv_parse (ops, readptr, endptr, typep, valp);
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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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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_BASE_PLATFORM, _("String identifying base platform"), str);
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TAG (AT_RANDOM, _("Address of 16 random bytes"), hex);
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TAG (AT_EXECFN, _("File name of executable"), str);
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TAG (AT_SECURE, _("Boolean, was exec setuid-like?"), 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_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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plongest (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", plongest (val));
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break;
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case hex:
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fprintf_filtered (file, "%s\n", paddress (target_gdbarch, val));
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break;
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case str:
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{
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struct value_print_options opts;
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get_user_print_options (&opts);
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if (opts.addressprint)
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fprintf_filtered (file, "%s", paddress (target_gdbarch, val));
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val_print_string (builtin_type (target_gdbarch)->builtin_char,
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val, -1, file, &opts);
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fprintf_filtered (file, "\n");
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}
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break;
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}
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++ents;
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if (type == AT_NULL)
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break;
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}
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xfree (data);
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return ents;
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}
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static void
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info_auxv_command (char *cmd, int from_tty)
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{
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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, ¤t_target);
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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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void
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_initialize_auxv (void)
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{
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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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