mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-26 19:44:11 +08:00
ffe5a37e17
instead of builtin_type_void_data_ptr. * target.c (default_region_ok_for_hw_watchpoint): Likewise.
284 lines
8.7 KiB
C
284 lines
8.7 KiB
C
/* Auxiliary vector support for GDB, the GNU debugger.
|
|
|
|
Copyright (C) 2004, 2005, 2006, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "target.h"
|
|
#include "gdbtypes.h"
|
|
#include "command.h"
|
|
#include "inferior.h"
|
|
#include "valprint.h"
|
|
#include "gdb_assert.h"
|
|
|
|
#include "auxv.h"
|
|
#include "elf/common.h"
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
|
|
|
|
/* This function is called like a to_xfer_partial hook,
|
|
but must be called with TARGET_OBJECT_AUXV.
|
|
It handles access via /proc/PID/auxv, which is the common method.
|
|
This function is appropriate for doing:
|
|
#define NATIVE_XFER_AUXV procfs_xfer_auxv
|
|
for a native target that uses inftarg.c's child_xfer_partial hook. */
|
|
|
|
LONGEST
|
|
procfs_xfer_auxv (struct target_ops *ops,
|
|
int /* enum target_object */ object,
|
|
const char *annex,
|
|
gdb_byte *readbuf,
|
|
const gdb_byte *writebuf,
|
|
ULONGEST offset,
|
|
LONGEST len)
|
|
{
|
|
char *pathname;
|
|
int fd;
|
|
LONGEST n;
|
|
|
|
gdb_assert (object == TARGET_OBJECT_AUXV);
|
|
gdb_assert (readbuf || writebuf);
|
|
|
|
pathname = xstrprintf ("/proc/%d/auxv", PIDGET (inferior_ptid));
|
|
fd = open (pathname, writebuf != NULL ? O_WRONLY : O_RDONLY);
|
|
xfree (pathname);
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
if (offset != (ULONGEST) 0
|
|
&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
|
|
n = -1;
|
|
else if (readbuf != NULL)
|
|
n = read (fd, readbuf, len);
|
|
else
|
|
n = write (fd, writebuf, len);
|
|
|
|
(void) close (fd);
|
|
|
|
return n;
|
|
}
|
|
|
|
/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
|
|
Return 0 if *READPTR is already at the end of the buffer.
|
|
Return -1 if there is insufficient buffer for a whole entry.
|
|
Return 1 if an entry was read into *TYPEP and *VALP. */
|
|
int
|
|
default_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
|
|
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
|
|
{
|
|
const int sizeof_auxv_field = gdbarch_ptr_bit (target_gdbarch)
|
|
/ TARGET_CHAR_BIT;
|
|
gdb_byte *ptr = *readptr;
|
|
|
|
if (endptr == ptr)
|
|
return 0;
|
|
|
|
if (endptr - ptr < sizeof_auxv_field * 2)
|
|
return -1;
|
|
|
|
*typep = extract_unsigned_integer (ptr, sizeof_auxv_field);
|
|
ptr += sizeof_auxv_field;
|
|
*valp = extract_unsigned_integer (ptr, sizeof_auxv_field);
|
|
ptr += sizeof_auxv_field;
|
|
|
|
*readptr = ptr;
|
|
return 1;
|
|
}
|
|
|
|
/* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
|
|
Return 0 if *READPTR is already at the end of the buffer.
|
|
Return -1 if there is insufficient buffer for a whole entry.
|
|
Return 1 if an entry was read into *TYPEP and *VALP. */
|
|
int
|
|
target_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
|
|
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
|
|
{
|
|
struct target_ops *t;
|
|
for (t = ops; t != NULL; t = t->beneath)
|
|
if (t->to_auxv_parse != NULL)
|
|
return t->to_auxv_parse (t, readptr, endptr, typep, valp);
|
|
|
|
return default_auxv_parse (ops, readptr, endptr, typep, valp);
|
|
}
|
|
|
|
/* Extract the auxiliary vector entry with a_type matching MATCH.
|
|
Return zero if no such entry was found, or -1 if there was
|
|
an error getting the information. On success, return 1 after
|
|
storing the entry's value field in *VALP. */
|
|
int
|
|
target_auxv_search (struct target_ops *ops, CORE_ADDR match, CORE_ADDR *valp)
|
|
{
|
|
CORE_ADDR type, val;
|
|
gdb_byte *data;
|
|
LONGEST n = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL, &data);
|
|
gdb_byte *ptr = data;
|
|
int ents = 0;
|
|
|
|
if (n <= 0)
|
|
return n;
|
|
|
|
while (1)
|
|
switch (target_auxv_parse (ops, &ptr, data + n, &type, &val))
|
|
{
|
|
case 1: /* Here's an entry, check it. */
|
|
if (type == match)
|
|
{
|
|
xfree (data);
|
|
*valp = val;
|
|
return 1;
|
|
}
|
|
break;
|
|
case 0: /* End of the vector. */
|
|
xfree (data);
|
|
return 0;
|
|
default: /* Bogosity. */
|
|
xfree (data);
|
|
return -1;
|
|
}
|
|
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
|
|
/* Print the contents of the target's AUXV on the specified file. */
|
|
int
|
|
fprint_target_auxv (struct ui_file *file, struct target_ops *ops)
|
|
{
|
|
CORE_ADDR type, val;
|
|
gdb_byte *data;
|
|
LONGEST len = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL,
|
|
&data);
|
|
gdb_byte *ptr = data;
|
|
int ents = 0;
|
|
|
|
if (len <= 0)
|
|
return len;
|
|
|
|
while (target_auxv_parse (ops, &ptr, data + len, &type, &val) > 0)
|
|
{
|
|
extern int addressprint;
|
|
const char *name = "???";
|
|
const char *description = "";
|
|
enum { dec, hex, str } flavor = hex;
|
|
|
|
switch (type)
|
|
{
|
|
#define TAG(tag, text, kind) \
|
|
case tag: name = #tag; description = text; flavor = kind; break
|
|
TAG (AT_NULL, _("End of vector"), hex);
|
|
TAG (AT_IGNORE, _("Entry should be ignored"), hex);
|
|
TAG (AT_EXECFD, _("File descriptor of program"), dec);
|
|
TAG (AT_PHDR, _("Program headers for program"), hex);
|
|
TAG (AT_PHENT, _("Size of program header entry"), dec);
|
|
TAG (AT_PHNUM, _("Number of program headers"), dec);
|
|
TAG (AT_PAGESZ, _("System page size"), dec);
|
|
TAG (AT_BASE, _("Base address of interpreter"), hex);
|
|
TAG (AT_FLAGS, _("Flags"), hex);
|
|
TAG (AT_ENTRY, _("Entry point of program"), hex);
|
|
TAG (AT_NOTELF, _("Program is not ELF"), dec);
|
|
TAG (AT_UID, _("Real user ID"), dec);
|
|
TAG (AT_EUID, _("Effective user ID"), dec);
|
|
TAG (AT_GID, _("Real group ID"), dec);
|
|
TAG (AT_EGID, _("Effective group ID"), dec);
|
|
TAG (AT_CLKTCK, _("Frequency of times()"), dec);
|
|
TAG (AT_PLATFORM, _("String identifying platform"), str);
|
|
TAG (AT_HWCAP, _("Machine-dependent CPU capability hints"), hex);
|
|
TAG (AT_FPUCW, _("Used FPU control word"), dec);
|
|
TAG (AT_DCACHEBSIZE, _("Data cache block size"), dec);
|
|
TAG (AT_ICACHEBSIZE, _("Instruction cache block size"), dec);
|
|
TAG (AT_UCACHEBSIZE, _("Unified cache block size"), dec);
|
|
TAG (AT_IGNOREPPC, _("Entry should be ignored"), dec);
|
|
TAG (AT_SYSINFO, _("Special system info/entry points"), hex);
|
|
TAG (AT_SYSINFO_EHDR, _("System-supplied DSO's ELF header"), hex);
|
|
TAG (AT_SECURE, _("Boolean, was exec setuid-like?"), dec);
|
|
TAG (AT_SUN_UID, _("Effective user ID"), dec);
|
|
TAG (AT_SUN_RUID, _("Real user ID"), dec);
|
|
TAG (AT_SUN_GID, _("Effective group ID"), dec);
|
|
TAG (AT_SUN_RGID, _("Real group ID"), dec);
|
|
TAG (AT_SUN_LDELF, _("Dynamic linker's ELF header"), hex);
|
|
TAG (AT_SUN_LDSHDR, _("Dynamic linker's section headers"), hex);
|
|
TAG (AT_SUN_LDNAME, _("String giving name of dynamic linker"), str);
|
|
TAG (AT_SUN_LPAGESZ, _("Large pagesize"), dec);
|
|
TAG (AT_SUN_PLATFORM, _("Platform name string"), str);
|
|
TAG (AT_SUN_HWCAP, _("Machine-dependent CPU capability hints"), hex);
|
|
TAG (AT_SUN_IFLUSH, _("Should flush icache?"), dec);
|
|
TAG (AT_SUN_CPU, _("CPU name string"), str);
|
|
TAG (AT_SUN_EMUL_ENTRY, _("COFF entry point address"), hex);
|
|
TAG (AT_SUN_EMUL_EXECFD, _("COFF executable file descriptor"), dec);
|
|
TAG (AT_SUN_EXECNAME,
|
|
_("Canonicalized file name given to execve"), str);
|
|
TAG (AT_SUN_MMU, _("String for name of MMU module"), str);
|
|
TAG (AT_SUN_LDDATA, _("Dynamic linker's data segment address"), hex);
|
|
TAG (AT_SUN_AUXFLAGS,
|
|
_("AF_SUN_ flags passed from the kernel"), hex);
|
|
}
|
|
|
|
fprintf_filtered (file, "%-4s %-20s %-30s ",
|
|
plongest (type), name, description);
|
|
switch (flavor)
|
|
{
|
|
case dec:
|
|
fprintf_filtered (file, "%s\n", plongest (val));
|
|
break;
|
|
case hex:
|
|
fprintf_filtered (file, "0x%s\n", paddr_nz (val));
|
|
break;
|
|
case str:
|
|
if (addressprint)
|
|
fprintf_filtered (file, "0x%s", paddr_nz (val));
|
|
val_print_string (val, -1, 1, file);
|
|
fprintf_filtered (file, "\n");
|
|
break;
|
|
}
|
|
++ents;
|
|
if (type == AT_NULL)
|
|
break;
|
|
}
|
|
|
|
xfree (data);
|
|
|
|
return ents;
|
|
}
|
|
|
|
static void
|
|
info_auxv_command (char *cmd, int from_tty)
|
|
{
|
|
if (! target_has_stack)
|
|
error (_("The program has no auxiliary information now."));
|
|
else
|
|
{
|
|
int ents = fprint_target_auxv (gdb_stdout, ¤t_target);
|
|
if (ents < 0)
|
|
error (_("No auxiliary vector found, or failed reading it."));
|
|
else if (ents == 0)
|
|
error (_("Auxiliary vector is empty."));
|
|
}
|
|
}
|
|
|
|
|
|
extern initialize_file_ftype _initialize_auxv; /* -Wmissing-prototypes; */
|
|
|
|
void
|
|
_initialize_auxv (void)
|
|
{
|
|
add_info ("auxv", info_auxv_command,
|
|
_("Display the inferior's auxiliary vector.\n\
|
|
This is information provided by the operating system at program startup."));
|
|
}
|