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301 lines
8.6 KiB
C
301 lines
8.6 KiB
C
/* Auxiliary vector support for GDB, the GNU debugger.
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Copyright 2004 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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void *readbuf,
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const void *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 all the auxv data into a contiguous xmalloc'd buffer,
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stored in *DATA. Return the size in bytes of this data.
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If zero, there is no data and *DATA is null.
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if < 0, there was an error and *DATA is null. */
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LONGEST
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target_auxv_read (struct target_ops *ops, char **data)
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{
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size_t auxv_alloc = 512, auxv_pos = 0;
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char *auxv = xmalloc (auxv_alloc);
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int n;
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while (1)
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{
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n = target_read_partial (ops, TARGET_OBJECT_AUXV,
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NULL, &auxv[auxv_pos], 0,
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auxv_alloc - auxv_pos);
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if (n <= 0)
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break;
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auxv_pos += n;
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if (auxv_pos < auxv_alloc) /* Read all there was. */
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break;
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gdb_assert (auxv_pos == auxv_alloc);
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auxv_alloc *= 2;
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auxv = xrealloc (auxv, auxv_alloc);
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}
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if (auxv_pos == 0)
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{
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xfree (auxv);
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*data = NULL;
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return n;
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}
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*data = auxv;
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return auxv_pos;
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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, char **readptr, char *endptr,
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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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char *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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char *data;
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int n = target_auxv_read (ops, &data);
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char *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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char *data;
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int len = target_auxv_read (ops, &data);
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char *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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}
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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);
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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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