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959 lines
28 KiB
C
959 lines
28 KiB
C
/* Handle AIX5 shared libraries for GDB, the GNU Debugger.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
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2001
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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 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 <sys/types.h>
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#include <signal.h>
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#include "gdb_string.h"
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#include <sys/param.h>
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#include <fcntl.h>
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#include <sys/procfs.h>
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#include "elf/external.h"
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#include "symtab.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "target.h"
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#include "frame.h"
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#include "gdb_regex.h"
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#include "inferior.h"
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#include "environ.h"
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#include "language.h"
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#include "gdbcmd.h"
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#include "solist.h"
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/* Link map info to include in an allocated so_list entry */
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struct lm_info
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{
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int nmappings; /* number of mappings */
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struct lm_mapping
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{
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CORE_ADDR addr; /* base address */
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CORE_ADDR size; /* size of mapped object */
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CORE_ADDR offset; /* offset into mapped object */
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long flags; /* MA_ protection and attribute flags */
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CORE_ADDR gp; /* global pointer value */
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} *mapping;
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char *mapname; /* name in /proc/pid/object */
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char *pathname; /* full pathname to object */
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char *membername; /* member name in archive file */
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};
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/* List of symbols in the dynamic linker where GDB can try to place
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a breakpoint to monitor shared library events. */
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static char *solib_break_names[] =
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{
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"_r_debug_state",
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NULL
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};
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static void aix5_relocate_main_executable (void);
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/*
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LOCAL FUNCTION
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bfd_lookup_symbol -- lookup the value for a specific symbol
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SYNOPSIS
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CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
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DESCRIPTION
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An expensive way to lookup the value of a single symbol for
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bfd's that are only temporary anyway. This is used by the
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shared library support to find the address of the debugger
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interface structures in the shared library.
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Note that 0 is specifically allowed as an error return (no
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such symbol).
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*/
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static CORE_ADDR
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bfd_lookup_symbol (bfd *abfd, char *symname)
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{
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long storage_needed;
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asymbol *sym;
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asymbol **symbol_table;
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unsigned int number_of_symbols;
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unsigned int i;
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struct cleanup *back_to;
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CORE_ADDR symaddr = 0;
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storage_needed = bfd_get_symtab_upper_bound (abfd);
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if (storage_needed > 0)
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{
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symbol_table = (asymbol **) xmalloc (storage_needed);
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back_to = make_cleanup (xfree, symbol_table);
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number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
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for (i = 0; i < number_of_symbols; i++)
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{
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sym = *symbol_table++;
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if (strcmp (sym->name, symname) == 0)
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{
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/* Bfd symbols are section relative. */
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symaddr = sym->value + sym->section->vma;
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break;
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}
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}
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do_cleanups (back_to);
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}
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if (symaddr)
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return symaddr;
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/* Look for the symbol in the dynamic string table too. */
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storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
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if (storage_needed > 0)
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{
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symbol_table = (asymbol **) xmalloc (storage_needed);
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back_to = make_cleanup (xfree, symbol_table);
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number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table);
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for (i = 0; i < number_of_symbols; i++)
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{
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sym = *symbol_table++;
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if (strcmp (sym->name, symname) == 0)
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{
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/* Bfd symbols are section relative. */
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symaddr = sym->value + sym->section->vma;
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break;
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}
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}
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do_cleanups (back_to);
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}
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return symaddr;
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}
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/* Read /proc/PID/map and build a list of shared objects such that
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the pr_mflags value AND'd with MATCH_MASK is equal to MATCH_VAL.
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This gives us a convenient way to find all of the mappings that
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don't belong to the main executable or vice versa. Here are
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some of the possibilities:
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- Fetch all mappings:
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MATCH_MASK: 0
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MATCH_VAL: 0
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- Fetch all mappings except for main executable:
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MATCH_MASK: MA_MAINEXEC
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MATCH_VAL: 0
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- Fetch only main executable:
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MATCH_MASK: MA_MAINEXEC
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MATCH_VAL: MA_MAINEXEC
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A cleanup chain for the list allocations done by this function should
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be established prior to calling build_so_list_from_mapfile(). */
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static struct so_list *
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build_so_list_from_mapfile (int pid, long match_mask, long match_val)
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{
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char *mapbuf = NULL;
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struct prmap *prmap;
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int mapbuf_size;
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struct so_list *sos = NULL;
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{
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int mapbuf_allocation_size = 8192;
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char *map_pathname;
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int map_fd;
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/* Open the map file */
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xasprintf (&map_pathname, "/proc/%d/map", pid);
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map_fd = open (map_pathname, O_RDONLY);
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xfree (map_pathname);
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if (map_fd < 0)
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return 0;
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/* Read the entire map file in */
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do
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{
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if (mapbuf)
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{
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xfree (mapbuf);
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mapbuf_allocation_size *= 2;
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lseek (map_fd, 0, SEEK_SET);
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}
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mapbuf = xmalloc (mapbuf_allocation_size);
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mapbuf_size = read (map_fd, mapbuf, mapbuf_allocation_size);
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if (mapbuf_size < 0)
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{
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xfree (mapbuf);
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/* FIXME: This warrants an error or a warning of some sort */
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return 0;
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}
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} while (mapbuf_size == mapbuf_allocation_size);
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close (map_fd);
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}
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for (prmap = (struct prmap *) mapbuf;
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(char *) prmap < mapbuf + mapbuf_size;
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prmap++)
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{
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char *mapname, *pathname, *membername;
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struct so_list *sop;
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int mapidx;
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if (prmap->pr_size == 0)
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break;
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/* Skip to the next entry if there's no path associated with the
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map, unless we're looking for the kernel text region, in which
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case it's okay if there's no path. */
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if ((prmap->pr_pathoff == 0 || prmap->pr_pathoff >= mapbuf_size)
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&& ((match_mask & MA_KERNTEXT) == 0))
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continue;
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/* Skip to the next entry if our match conditions don't hold. */
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if ((prmap->pr_mflags & match_mask) != match_val)
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continue;
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mapname = prmap->pr_mapname;
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if (prmap->pr_pathoff == 0)
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{
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pathname = "";
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membername = "";
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}
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else
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{
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pathname = mapbuf + prmap->pr_pathoff;
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membername = pathname + strlen (pathname) + 1;
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}
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for (sop = sos; sop != NULL; sop = sop->next)
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if (strcmp (pathname, sop->lm_info->pathname) == 0
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&& strcmp (membername, sop->lm_info->membername) == 0)
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break;
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if (sop == NULL)
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{
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sop = xcalloc (1, sizeof (struct so_list));
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make_cleanup (xfree, sop);
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sop->lm_info = xcalloc (1, sizeof (struct lm_info));
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make_cleanup (xfree, sop->lm_info);
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sop->lm_info->mapname = xstrdup (mapname);
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make_cleanup (xfree, sop->lm_info->mapname);
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/* FIXME: Eliminate the pathname field once length restriction
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is lifted on so_name and so_original_name. */
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sop->lm_info->pathname = xstrdup (pathname);
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make_cleanup (xfree, sop->lm_info->pathname);
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sop->lm_info->membername = xstrdup (membername);
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make_cleanup (xfree, sop->lm_info->membername);
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strncpy (sop->so_name, pathname, SO_NAME_MAX_PATH_SIZE - 1);
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sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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strcpy (sop->so_original_name, sop->so_name);
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sop->next = sos;
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sos = sop;
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}
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mapidx = sop->lm_info->nmappings;
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sop->lm_info->nmappings += 1;
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sop->lm_info->mapping
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= xrealloc (sop->lm_info->mapping,
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sop->lm_info->nmappings * sizeof (struct lm_mapping));
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sop->lm_info->mapping[mapidx].addr = (CORE_ADDR) prmap->pr_vaddr;
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sop->lm_info->mapping[mapidx].size = prmap->pr_size;
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sop->lm_info->mapping[mapidx].offset = prmap->pr_off;
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sop->lm_info->mapping[mapidx].flags = prmap->pr_mflags;
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sop->lm_info->mapping[mapidx].gp = (CORE_ADDR) prmap->pr_gp;
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}
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xfree (mapbuf);
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return sos;
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}
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/*
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LOCAL FUNCTION
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open_symbol_file_object
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SYNOPSIS
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void open_symbol_file_object (void *from_tty)
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DESCRIPTION
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If no open symbol file, attempt to locate and open the main symbol
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file.
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If FROM_TTYP dereferences to a non-zero integer, allow messages to
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be printed. This parameter is a pointer rather than an int because
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open_symbol_file_object() is called via catch_errors() and
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catch_errors() requires a pointer argument. */
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static int
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open_symbol_file_object (void *from_ttyp)
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{
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CORE_ADDR lm, l_name;
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char *filename;
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int errcode;
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int from_tty = *(int *)from_ttyp;
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struct cleanup *old_chain = make_cleanup (null_cleanup, 0);
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struct so_list *sos;
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sos = build_so_list_from_mapfile (PIDGET (inferior_ptid),
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MA_MAINEXEC, MA_MAINEXEC);
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if (sos == NULL)
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{
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warning ("Could not find name of main executable in map file");
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return 0;
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}
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symbol_file_command (sos->lm_info->pathname, from_tty);
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do_cleanups (old_chain);
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aix5_relocate_main_executable ();
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return 1;
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}
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/* LOCAL FUNCTION
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aix5_current_sos -- build a list of currently loaded shared objects
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SYNOPSIS
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struct so_list *aix5_current_sos ()
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DESCRIPTION
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Build a list of `struct so_list' objects describing the shared
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objects currently loaded in the inferior. This list does not
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include an entry for the main executable file.
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Note that we only gather information directly available from the
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inferior --- we don't examine any of the shared library files
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themselves. The declaration of `struct so_list' says which fields
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we provide values for. */
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static struct so_list *
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aix5_current_sos (void)
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{
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struct cleanup *old_chain = make_cleanup (null_cleanup, 0);
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struct so_list *sos;
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/* Fetch the list of mappings, excluding the main executable. */
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sos = build_so_list_from_mapfile (PIDGET (inferior_ptid), MA_MAINEXEC, 0);
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/* Reverse the list; it looks nicer when we print it if the mappings
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are in the same order as in the map file. */
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if (sos)
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{
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struct so_list *next = sos->next;
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sos->next = 0;
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while (next)
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{
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struct so_list *prev = sos;
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sos = next;
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next = next->next;
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sos->next = prev;
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}
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}
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discard_cleanups (old_chain);
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return sos;
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}
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/* Return 1 if PC lies in the dynamic symbol resolution code of the
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run time loader. */
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static CORE_ADDR interp_text_sect_low;
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static CORE_ADDR interp_text_sect_high;
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static CORE_ADDR interp_plt_sect_low;
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static CORE_ADDR interp_plt_sect_high;
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static int
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aix5_in_dynsym_resolve_code (CORE_ADDR pc)
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{
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return ((pc >= interp_text_sect_low && pc < interp_text_sect_high)
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|| (pc >= interp_plt_sect_low && pc < interp_plt_sect_high)
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|| in_plt_section (pc, NULL));
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}
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/*
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LOCAL FUNCTION
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enable_break -- arrange for dynamic linker to hit breakpoint
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SYNOPSIS
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int enable_break (void)
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DESCRIPTION
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The dynamic linkers has, as part of its debugger interface, support
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for arranging for the inferior to hit a breakpoint after mapping in
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the shared libraries. This function enables that breakpoint.
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*/
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static int
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enable_break (void)
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{
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int success = 0;
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struct minimal_symbol *msymbol;
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char **bkpt_namep;
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asection *interp_sect;
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/* First, remove all the solib event breakpoints. Their addresses
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may have changed since the last time we ran the program. */
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remove_solib_event_breakpoints ();
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interp_text_sect_low = interp_text_sect_high = 0;
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interp_plt_sect_low = interp_plt_sect_high = 0;
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/* Find the .interp section; if not found, warn the user and drop
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into the old breakpoint at symbol code. */
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interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
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if (interp_sect)
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{
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unsigned int interp_sect_size;
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char *buf;
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CORE_ADDR load_addr;
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bfd *tmp_bfd;
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CORE_ADDR sym_addr = 0;
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/* Read the contents of the .interp section into a local buffer;
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the contents specify the dynamic linker this program uses. */
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interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
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buf = alloca (interp_sect_size);
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bfd_get_section_contents (exec_bfd, interp_sect,
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buf, 0, interp_sect_size);
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/* Now we need to figure out where the dynamic linker was
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loaded so that we can load its symbols and place a breakpoint
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in the dynamic linker itself.
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This address is stored on the stack. However, I've been unable
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to find any magic formula to find it for Solaris (appears to
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be trivial on GNU/Linux). Therefore, we have to try an alternate
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mechanism to find the dynamic linker's base address. */
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tmp_bfd = bfd_openr (buf, gnutarget);
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if (tmp_bfd == NULL)
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goto bkpt_at_symbol;
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/* Make sure the dynamic linker's really a useful object. */
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if (!bfd_check_format (tmp_bfd, bfd_object))
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{
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warning ("Unable to grok dynamic linker %s as an object file", buf);
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bfd_close (tmp_bfd);
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goto bkpt_at_symbol;
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}
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/* We find the dynamic linker's base address by examining the
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current pc (which point at the entry point for the dynamic
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linker) and subtracting the offset of the entry point. */
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load_addr = read_pc () - tmp_bfd->start_address;
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/* Record the relocated start and end address of the dynamic linker
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text and plt section for aix5_in_dynsym_resolve_code. */
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interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
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if (interp_sect)
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{
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interp_text_sect_low =
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bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
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interp_text_sect_high =
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interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect);
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}
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interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
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if (interp_sect)
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{
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interp_plt_sect_low =
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bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
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interp_plt_sect_high =
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interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
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}
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/* Now try to set a breakpoint in the dynamic linker. */
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for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
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{
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sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep);
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if (sym_addr != 0)
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break;
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}
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/* We're done with the temporary bfd. */
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bfd_close (tmp_bfd);
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if (sym_addr != 0)
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{
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create_solib_event_breakpoint (load_addr + sym_addr);
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return 1;
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}
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/* For whatever reason we couldn't set a breakpoint in the dynamic
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linker. Warn and drop into the old code. */
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bkpt_at_symbol:
|
|
warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code.");
|
|
}
|
|
|
|
/* Nothing good happened. */
|
|
success = 0;
|
|
|
|
return (success);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
special_symbol_handling -- additional shared library symbol handling
|
|
|
|
SYNOPSIS
|
|
|
|
void special_symbol_handling ()
|
|
|
|
DESCRIPTION
|
|
|
|
Once the symbols from a shared object have been loaded in the usual
|
|
way, we are called to do any system specific symbol handling that
|
|
is needed.
|
|
|
|
*/
|
|
|
|
static void
|
|
aix5_special_symbol_handling (void)
|
|
{
|
|
/* Nothing needed (yet) for AIX5. */
|
|
}
|
|
|
|
/* On AIX5, the /proc/PID/map information is used to determine
|
|
the relocation offsets needed for relocating the main executable.
|
|
There is no problem determining which map entries correspond
|
|
to the main executable, because these will have the MA_MAINEXEC
|
|
flag set. The tricky part is determining which sections correspond
|
|
to which map entries. To date, the following approaches have
|
|
been tried:
|
|
|
|
- Use the MA_WRITE attribute of pr_mflags to distinguish the read-only
|
|
mapping from the read/write mapping. (This assumes that there are
|
|
only two mappings for the main executable.) All writable sections
|
|
are associated with the read/write mapping and all non-writable
|
|
sections are associated with the read-only mapping.
|
|
|
|
This approach worked quite well until we came across executables
|
|
which didn't have a read-only mapping. Both mappings had the
|
|
same attributes represented in pr_mflags and it was impossible
|
|
to tell them apart.
|
|
|
|
- Use the pr_off field (which represents the offset into the
|
|
executable) to determine the section-to-mapping relationship.
|
|
Unfortunately, this approach doesn't work either, because the
|
|
offset value contained in the mapping is rounded down by some
|
|
moderately large power-of-2 value (4096 is a typical value).
|
|
A small (e.g. "Hello World") program will appear to have all
|
|
of its sections belonging to both mappings.
|
|
|
|
Also, the following approach has been considered, but dismissed:
|
|
|
|
- The section vma values typically look (something) like
|
|
0x00000001xxxxxxxx or 0x00000002xxxxxxxx. Furthermore, the
|
|
0x00000001xxxxxxxx values always belong to one mapping and
|
|
the 0x00000002xxxxxxxx values always belong to the other.
|
|
Thus it seems conceivable that GDB could use the bit patterns
|
|
in the upper portion (for some definition of "upper") in a
|
|
section's vma to help determine the section-to-mapping
|
|
relationship.
|
|
|
|
This approach was dismissed because there is nothing to prevent
|
|
the linker from lumping the section vmas together in one large
|
|
contiguous space and still expecting the dynamic linker to
|
|
separate them and relocate them independently. Also, different
|
|
linkers have been observed to use different patterns for the
|
|
upper portions of the vma addresses and it isn't clear what the
|
|
mask ought to be for distinguishing these patterns.
|
|
|
|
The current (admittedly inelegant) approach uses a lookup
|
|
table which associates section names with the map index that
|
|
they're permitted to be in. This is inelegant because we are
|
|
making the following assumptions:
|
|
|
|
1) There will only be two mappings.
|
|
2) The relevant (i.e. main executable) mappings will always appear
|
|
in the same order in the map file.
|
|
3) The sections named in the table will always belong to the
|
|
indicated mapping.
|
|
4) The table completely enumerates all possible section names.
|
|
|
|
IMO, any of these deficiencies alone will normally be sufficient
|
|
to disqualify this approach, but I haven't been able to think of
|
|
a better way to do it.
|
|
|
|
map_index_vs_section_name_okay() is a predicate which returns
|
|
true iff the section name NAME is associated with the map index
|
|
IDX in its builtin table. Of course, there's no guarantee that
|
|
this association is actually valid... */
|
|
|
|
static int
|
|
map_index_vs_section_name_okay (int idx, const char *name)
|
|
{
|
|
static struct
|
|
{
|
|
char *name;
|
|
int idx;
|
|
} okay[] =
|
|
{
|
|
{ ".interp", 0 },
|
|
{ ".hash", 0 },
|
|
{ ".dynsym", 0 },
|
|
{ ".dynstr", 0 },
|
|
{ ".rela.text", 0 },
|
|
{ ".rela.rodata", 0 },
|
|
{ ".rela.data", 0 },
|
|
{ ".rela.ctors", 0 },
|
|
{ ".rela.dtors", 0 },
|
|
{ ".rela.got", 0 },
|
|
{ ".rela.sdata", 0 },
|
|
{ ".rela.IA_64.pltoff", 0 },
|
|
{ ".rel.data", 0 },
|
|
{ ".rel.sdata", 0 },
|
|
{ ".rel.got", 0 },
|
|
{ ".rel.AIX.pfdesc", 0 },
|
|
{ ".rel.IA_64.pltoff", 0 },
|
|
{ ".dynamic", 0 },
|
|
{ ".init", 0 },
|
|
{ ".plt", 0 },
|
|
{ ".text", 0 },
|
|
{ ".fini", 0 },
|
|
{ ".rodata", 0 },
|
|
{ ".IA_64.unwind_info", 0 },
|
|
{ ".IA_64.unwind", 0 },
|
|
{ ".AIX.mustrel", 0 },
|
|
|
|
{ ".data", 1 },
|
|
{ ".ctors", 1 },
|
|
{ ".dtors", 1 },
|
|
{ ".got", 1 },
|
|
{ ".dynamic", 1},
|
|
{ ".sdata", 1 },
|
|
{ ".IA_64.pltoff", 1 },
|
|
{ ".sbss", 1 },
|
|
{ ".bss", 1 },
|
|
{ ".AIX.pfdesc", 1 }
|
|
};
|
|
int i;
|
|
|
|
for (i = 0; i < sizeof (okay) / sizeof (okay[0]); i++)
|
|
{
|
|
if (strcmp (name, okay[i].name) == 0)
|
|
return idx == okay[i].idx;
|
|
}
|
|
|
|
warning ("solib-aix5.c: Ignoring section %s when relocating the executable\n",
|
|
name);
|
|
return 0;
|
|
}
|
|
|
|
#define SECTMAPMASK (~ (CORE_ADDR) 0x03ffffff)
|
|
|
|
static void
|
|
aix5_relocate_main_executable (void)
|
|
{
|
|
struct so_list *so;
|
|
struct section_offsets *new_offsets;
|
|
int i;
|
|
int changed = 0;
|
|
struct cleanup *old_chain = make_cleanup (null_cleanup, 0);
|
|
|
|
/* Fetch the mappings for the main executable from the map file. */
|
|
so = build_so_list_from_mapfile (PIDGET (inferior_ptid),
|
|
MA_MAINEXEC, MA_MAINEXEC);
|
|
|
|
/* Make sure we actually have some mappings to work with. */
|
|
if (so == NULL)
|
|
{
|
|
warning ("Could not find main executable in map file");
|
|
do_cleanups (old_chain);
|
|
return;
|
|
}
|
|
|
|
/* Allocate the data structure which'll contain the new offsets to
|
|
relocate by. Initialize it so it contains the current offsets. */
|
|
new_offsets = xcalloc (symfile_objfile->num_sections,
|
|
sizeof (struct section_offsets));
|
|
make_cleanup (xfree, new_offsets);
|
|
for (i = 0; i < symfile_objfile->num_sections; i++)
|
|
new_offsets->offsets[i] = ANOFFSET (symfile_objfile->section_offsets, i);
|
|
|
|
/* Iterate over the mappings in the main executable and compute
|
|
the new offset value as appropriate. */
|
|
for (i = 0; i < so->lm_info->nmappings; i++)
|
|
{
|
|
CORE_ADDR increment = 0;
|
|
struct obj_section *sect;
|
|
bfd *obfd = symfile_objfile->obfd;
|
|
struct lm_mapping *mapping = &so->lm_info->mapping[i];
|
|
|
|
ALL_OBJFILE_OSECTIONS (symfile_objfile, sect)
|
|
{
|
|
int flags = bfd_get_section_flags (obfd, sect->the_bfd_section);
|
|
if (flags & SEC_ALLOC)
|
|
{
|
|
file_ptr filepos = sect->the_bfd_section->filepos;
|
|
if (map_index_vs_section_name_okay (i,
|
|
bfd_get_section_name (obfd, sect->the_bfd_section)))
|
|
{
|
|
int idx = sect->the_bfd_section->index;
|
|
|
|
if (increment == 0)
|
|
increment = mapping->addr
|
|
- (bfd_section_vma (obfd, sect->the_bfd_section)
|
|
& SECTMAPMASK);
|
|
|
|
if (increment != ANOFFSET (new_offsets, idx))
|
|
{
|
|
new_offsets->offsets[idx] = increment;
|
|
changed = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If any of the offsets have changed, then relocate the objfile. */
|
|
if (changed)
|
|
objfile_relocate (symfile_objfile, new_offsets);
|
|
|
|
/* Free up all the space we've allocated. */
|
|
do_cleanups (old_chain);
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
aix5_solib_create_inferior_hook -- shared library startup support
|
|
|
|
SYNOPSIS
|
|
|
|
void aix5_solib_create_inferior_hook()
|
|
|
|
DESCRIPTION
|
|
|
|
When gdb starts up the inferior, it nurses it along (through the
|
|
shell) until it is ready to execute it's first instruction. At this
|
|
point, this function gets called via expansion of the macro
|
|
SOLIB_CREATE_INFERIOR_HOOK.
|
|
|
|
For AIX5 executables, this first instruction is the first
|
|
instruction in the dynamic linker (for dynamically linked
|
|
executables) or the instruction at "start" for statically linked
|
|
executables. For dynamically linked executables, the system
|
|
first exec's libc.so.N, which contains the dynamic linker,
|
|
and starts it running. The dynamic linker maps in any needed
|
|
shared libraries, maps in the actual user executable, and then
|
|
jumps to "start" in the user executable.
|
|
|
|
*/
|
|
|
|
static void
|
|
aix5_solib_create_inferior_hook (void)
|
|
{
|
|
aix5_relocate_main_executable ();
|
|
|
|
if (!enable_break ())
|
|
{
|
|
warning ("shared library handler failed to enable breakpoint");
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void
|
|
aix5_clear_solib (void)
|
|
{
|
|
}
|
|
|
|
static void
|
|
aix5_free_so (struct so_list *so)
|
|
{
|
|
xfree (so->lm_info->mapname);
|
|
xfree (so->lm_info->pathname);
|
|
xfree (so->lm_info->membername);
|
|
xfree (so->lm_info);
|
|
}
|
|
|
|
static void
|
|
aix5_relocate_section_addresses (struct so_list *so,
|
|
struct section_table *sec)
|
|
{
|
|
int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section);
|
|
file_ptr filepos = sec->the_bfd_section->filepos;
|
|
|
|
if (flags & SEC_ALLOC)
|
|
{
|
|
int idx;
|
|
CORE_ADDR addr;
|
|
|
|
for (idx = 0; idx < so->lm_info->nmappings; idx++)
|
|
{
|
|
struct lm_mapping *mapping = &so->lm_info->mapping[idx];
|
|
if (mapping->offset <= filepos
|
|
&& filepos <= mapping->offset + mapping->size)
|
|
break;
|
|
}
|
|
|
|
if (idx >= so->lm_info->nmappings)
|
|
internal_error (__FILE__, __LINE__,
|
|
"aix_relocate_section_addresses: Can't find mapping for section %s",
|
|
bfd_get_section_name (sec->bfd, sec->the_bfd_section));
|
|
|
|
addr = so->lm_info->mapping[idx].addr;
|
|
|
|
sec->addr += addr;
|
|
sec->endaddr += addr;
|
|
}
|
|
}
|
|
|
|
/* Find the global pointer for the given function address ADDR. */
|
|
|
|
static CORE_ADDR
|
|
aix5_find_global_pointer (CORE_ADDR addr)
|
|
{
|
|
struct so_list *sos, *so;
|
|
CORE_ADDR global_pointer = 0;
|
|
struct cleanup *old_chain = make_cleanup (null_cleanup, 0);
|
|
|
|
sos = build_so_list_from_mapfile (PIDGET (inferior_ptid), 0, 0);
|
|
|
|
for (so = sos; so != NULL; so = so->next)
|
|
{
|
|
int idx;
|
|
for (idx = 0; idx < so->lm_info->nmappings; idx++)
|
|
if (so->lm_info->mapping[idx].addr <= addr
|
|
&& addr <= so->lm_info->mapping[idx].addr
|
|
+ so->lm_info->mapping[idx].size)
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (idx < so->lm_info->nmappings)
|
|
{
|
|
/* Look for a non-zero global pointer in the current set of
|
|
mappings. */
|
|
for (idx = 0; idx < so->lm_info->nmappings; idx++)
|
|
if (so->lm_info->mapping[idx].gp != 0)
|
|
{
|
|
global_pointer = so->lm_info->mapping[idx].gp;
|
|
break;
|
|
}
|
|
/* Get out regardless of whether we found one or not. Mappings
|
|
don't overlap, so it would be pointless to continue. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
do_cleanups (old_chain);
|
|
|
|
return global_pointer;
|
|
}
|
|
|
|
/* Find the execute-only kernel region known as the gate page. This
|
|
page is where the signal trampoline lives. It may be found by
|
|
querying the map file and looking for the MA_KERNTEXT flag. */
|
|
static void
|
|
aix5_find_gate_addresses (CORE_ADDR *start, CORE_ADDR *end)
|
|
{
|
|
struct so_list *so;
|
|
struct cleanup *old_chain = make_cleanup (null_cleanup, 0);
|
|
|
|
/* Fetch the mappings for the main executable from the map file. */
|
|
so = build_so_list_from_mapfile (PIDGET (inferior_ptid),
|
|
MA_KERNTEXT, MA_KERNTEXT);
|
|
|
|
/* Make sure we actually have some mappings to work with. */
|
|
if (so == NULL)
|
|
{
|
|
warning ("Could not find gate page in map file");
|
|
*start = 0;
|
|
*end = 0;
|
|
do_cleanups (old_chain);
|
|
return;
|
|
}
|
|
|
|
/* There should only be on kernel mapping for the gate page and
|
|
it'll be in the read-only (even though it's execute-only)
|
|
mapping in the lm_info struct. */
|
|
|
|
*start = so->lm_info->mapping[0].addr;
|
|
*end = *start + so->lm_info->mapping[0].size;
|
|
|
|
/* Free up all the space we've allocated. */
|
|
do_cleanups (old_chain);
|
|
}
|
|
|
|
/* From ia64-tdep.c. FIXME: If we end up using this for rs6000 too,
|
|
we'll need to make the names match. */
|
|
extern CORE_ADDR (*native_find_global_pointer) (CORE_ADDR);
|
|
|
|
/* From ia64-aix-tdep.c. Hook for finding the starting and
|
|
ending gate page addresses. The only reason that this hook
|
|
is in this file is because this is where the map file reading
|
|
code is located. */
|
|
extern void (*aix5_find_gate_addresses_hook) (CORE_ADDR *, CORE_ADDR *);
|
|
|
|
static struct target_so_ops aix5_so_ops;
|
|
|
|
void
|
|
_initialize_aix5_solib (void)
|
|
{
|
|
aix5_so_ops.relocate_section_addresses = aix5_relocate_section_addresses;
|
|
aix5_so_ops.free_so = aix5_free_so;
|
|
aix5_so_ops.clear_solib = aix5_clear_solib;
|
|
aix5_so_ops.solib_create_inferior_hook = aix5_solib_create_inferior_hook;
|
|
aix5_so_ops.special_symbol_handling = aix5_special_symbol_handling;
|
|
aix5_so_ops.current_sos = aix5_current_sos;
|
|
aix5_so_ops.open_symbol_file_object = open_symbol_file_object;
|
|
aix5_so_ops.in_dynsym_resolve_code = aix5_in_dynsym_resolve_code;
|
|
|
|
native_find_global_pointer = aix5_find_global_pointer;
|
|
aix5_find_gate_addresses_hook = aix5_find_gate_addresses;
|
|
|
|
/* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */
|
|
current_target_so_ops = &aix5_so_ops;
|
|
}
|