701 lines
22 KiB
C
701 lines
22 KiB
C
/* Copyright (C) 2010, 2012 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 "ia64-tdep.h"
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#include "ia64-hpux-tdep.h"
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#include "solib-ia64-hpux.h"
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#include "solist.h"
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#include "solib.h"
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#include "target.h"
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#include "gdbtypes.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "opcode/ia64.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "elf-bfd.h"
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#include "exceptions.h"
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/* Need to define the following macro in order to get the complete
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load_module_desc struct definition in dlfcn.h Otherwise, it doesn't
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match the size of the struct the loader is providing us during load
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events. */
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#define _LOAD_MODULE_DESC_EXT
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#include <sys/ttrace.h>
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#include <dlfcn.h>
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#include <elf.h>
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#include <service_mgr.h>
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/* The following is to have access to the definition of type load_info_t. */
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#include <crt0.h>
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/* The r32 pseudo-register number.
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Like all stacked registers, r32 is treated as a pseudo-register,
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because it is not always available for read/write via the ttrace
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interface. */
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/* This is a bit of a hack, as we duplicate something hidden inside
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ia64-tdep.c, but oh well... */
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#define IA64_R32_PSEUDO_REGNUM (IA64_NAT127_REGNUM + 2)
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/* Our struct so_list private data structure. */
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struct lm_info
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{
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/* The shared library module descriptor. We extract this structure
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from the loader at the time the shared library gets mapped. */
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struct load_module_desc module_desc;
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/* The text segment address as defined in the shared library object
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(this is not the address where this segment got loaded). This
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field is initially set to zero, and computed lazily. */
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CORE_ADDR text_start;
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/* The data segment address as defined in the shared library object
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(this is not the address where this segment got loaded). This
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field is initially set to zero, and computed lazily. */
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CORE_ADDR data_start;
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};
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/* The list of shared libraries currently mapped by the inferior. */
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static struct so_list *so_list_head = NULL;
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/* Create a new so_list element. The result should be deallocated
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when no longer in use. */
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static struct so_list *
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new_so_list (char *so_name, struct load_module_desc module_desc)
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{
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struct so_list *new_so;
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new_so = (struct so_list *) XZALLOC (struct so_list);
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new_so->lm_info = (struct lm_info *) XZALLOC (struct lm_info);
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new_so->lm_info->module_desc = module_desc;
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strncpy (new_so->so_name, so_name, SO_NAME_MAX_PATH_SIZE - 1);
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new_so->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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strcpy (new_so->so_original_name, new_so->so_name);
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return new_so;
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}
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/* Return non-zero if the instruction at the current PC is a breakpoint
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part of the dynamic loading process.
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We identify such instructions by checking that the instruction at
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the current pc is a break insn where no software breakpoint has been
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inserted by us. We also verify that the operands have specific
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known values, to be extra certain.
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PTID is the ptid of the thread that should be checked, but this
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function also assumes that inferior_ptid is already equal to PTID.
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Ideally, we would like to avoid the requirement on inferior_ptid,
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but many routines still use the inferior_ptid global to access
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the relevant thread's register and memory. We still have the ptid
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as parameter to be able to pass it to the routines that do take a ptid
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- that way we avoid increasing explicit uses of the inferior_ptid
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global. */
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static int
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ia64_hpux_at_dld_breakpoint_1_p (ptid_t ptid)
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{
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struct regcache *regcache = get_thread_regcache (ptid);
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CORE_ADDR pc = regcache_read_pc (regcache);
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struct address_space *aspace = get_regcache_aspace (regcache);
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ia64_insn t0, t1, slot[3], template, insn;
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int slotnum;
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bfd_byte bundle[16];
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/* If this is a regular breakpoint, then it can not be a dld one. */
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if (breakpoint_inserted_here_p (aspace, pc))
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return 0;
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slotnum = ((long) pc) & 0xf;
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if (slotnum > 2)
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internal_error (__FILE__, __LINE__,
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"invalid slot (%d) for address %s", slotnum,
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paddress (get_regcache_arch (regcache), pc));
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pc -= (pc & 0xf);
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read_memory (pc, bundle, sizeof (bundle));
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/* bundles are always in little-endian byte order */
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t0 = bfd_getl64 (bundle);
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t1 = bfd_getl64 (bundle + 8);
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template = (t0 >> 1) & 0xf;
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slot[0] = (t0 >> 5) & 0x1ffffffffffLL;
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slot[1] = ((t0 >> 46) & 0x3ffff) | ((t1 & 0x7fffff) << 18);
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slot[2] = (t1 >> 23) & 0x1ffffffffffLL;
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if (template == 2 && slotnum == 1)
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{
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/* skip L slot in MLI template: */
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slotnum = 2;
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}
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insn = slot[slotnum];
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return (insn == 0x1c0c9c0 /* break.i 0x070327 */
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|| insn == 0x3c0c9c0); /* break.i 0x0f0327 */
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}
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/* Same as ia64_hpux_at_dld_breakpoint_1_p above, with the following
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differences: It temporarily sets inferior_ptid to PTID, and also
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contains any exception being raised. */
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int
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ia64_hpux_at_dld_breakpoint_p (ptid_t ptid)
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{
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volatile struct gdb_exception e;
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ptid_t saved_ptid = inferior_ptid;
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int result = 0;
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inferior_ptid = ptid;
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TRY_CATCH (e, RETURN_MASK_ALL)
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{
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result = ia64_hpux_at_dld_breakpoint_1_p (ptid);
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}
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inferior_ptid = saved_ptid;
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if (e.reason < 0)
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warning (_("error while checking for dld breakpoint: %s"), e.message);
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return result;
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}
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/* Handler for library load event: Read the information provided by
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the loader, and then use it to read the shared library symbols. */
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static void
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ia64_hpux_handle_load_event (struct regcache *regcache)
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{
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CORE_ADDR module_desc_addr;
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ULONGEST module_desc_size;
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CORE_ADDR so_path_addr;
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char so_path[MAXPATHLEN];
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struct load_module_desc module_desc;
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struct so_list *new_so;
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/* Extract the data provided by the loader as follow:
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- r33: Address of load_module_desc structure
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- r34: size of struct load_module_desc
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- r35: Address of string holding shared library path
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*/
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regcache_cooked_read_unsigned (regcache, IA64_R32_PSEUDO_REGNUM + 1,
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&module_desc_addr);
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regcache_cooked_read_unsigned (regcache, IA64_R32_PSEUDO_REGNUM + 2,
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&module_desc_size);
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regcache_cooked_read_unsigned (regcache, IA64_R32_PSEUDO_REGNUM + 3,
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&so_path_addr);
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if (module_desc_size != sizeof (struct load_module_desc))
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warning (_("load_module_desc size (%ld) != size returned by kernel (%s)"),
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sizeof (struct load_module_desc),
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pulongest (module_desc_size));
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read_memory_string (so_path_addr, so_path, MAXPATHLEN);
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read_memory (module_desc_addr, (gdb_byte *) &module_desc,
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sizeof (module_desc));
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/* Create a new so_list element and insert it at the start of our
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so_list_head (we insert at the start of the list only because
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it is less work compared to inserting it elsewhere). */
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new_so = new_so_list (so_path, module_desc);
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new_so->next = so_list_head;
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so_list_head = new_so;
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}
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/* Update the value of the PC to point to the begining of the next
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instruction bundle. */
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static void
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ia64_hpux_move_pc_to_next_bundle (struct regcache *regcache)
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{
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CORE_ADDR pc = regcache_read_pc (regcache);
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pc -= pc & 0xf;
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pc += 16;
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ia64_write_pc (regcache, pc);
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}
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/* Handle loader events.
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PTID is the ptid of the thread corresponding to the event being
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handled. Similarly to ia64_hpux_at_dld_breakpoint_1_p, this
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function assumes that inferior_ptid is set to PTID. */
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static void
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ia64_hpux_handle_dld_breakpoint_1 (ptid_t ptid)
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{
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struct regcache *regcache = get_thread_regcache (ptid);
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ULONGEST arg0;
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/* The type of event is provided by the loaded via r32. */
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regcache_cooked_read_unsigned (regcache, IA64_R32_PSEUDO_REGNUM, &arg0);
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switch (arg0)
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{
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case BREAK_DE_SVC_LOADED:
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/* Currently, the only service loads are uld and dld,
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so we shouldn't need to do anything. Just ignore. */
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break;
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case BREAK_DE_LIB_LOADED:
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ia64_hpux_handle_load_event (regcache);
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solib_add (NULL, 0, ¤t_target, auto_solib_add);
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break;
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case BREAK_DE_LIB_UNLOADED:
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case BREAK_DE_LOAD_COMPLETE:
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case BREAK_DE_BOR:
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/* Ignore for now. */
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break;
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}
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/* Now that we have handled the event, we can move the PC to
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the next instruction bundle, past the break instruction. */
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ia64_hpux_move_pc_to_next_bundle (regcache);
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}
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/* Same as ia64_hpux_handle_dld_breakpoint_1 above, with the following
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differences: This function temporarily sets inferior_ptid to PTID,
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and also contains any exception. */
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void
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ia64_hpux_handle_dld_breakpoint (ptid_t ptid)
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{
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volatile struct gdb_exception e;
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ptid_t saved_ptid = inferior_ptid;
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inferior_ptid = ptid;
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TRY_CATCH (e, RETURN_MASK_ALL)
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{
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ia64_hpux_handle_dld_breakpoint_1 (ptid);
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}
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inferior_ptid = saved_ptid;
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if (e.reason < 0)
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warning (_("error detected while handling dld breakpoint: %s"), e.message);
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}
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/* Find the address of the code and data segments in ABFD, and update
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TEXT_START and DATA_START accordingly. */
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static void
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ia64_hpux_find_start_vma (bfd *abfd, CORE_ADDR *text_start,
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CORE_ADDR *data_start)
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{
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Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
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Elf64_Phdr phdr;
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int i;
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*text_start = 0;
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*data_start = 0;
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if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1)
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error (_("invalid program header offset in %s"), abfd->filename);
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for (i = 0; i < i_ehdrp->e_phnum; i++)
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{
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if (bfd_bread (&phdr, sizeof (phdr), abfd) != sizeof (phdr))
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error (_("failed to read segment %d in %s"), i, abfd->filename);
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if (phdr.p_flags & PF_X
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&& (*text_start == 0 || phdr.p_vaddr < *text_start))
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*text_start = phdr.p_vaddr;
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if (phdr.p_flags & PF_W
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&& (*data_start == 0 || phdr.p_vaddr < *data_start))
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*data_start = phdr.p_vaddr;
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}
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}
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/* The "relocate_section_addresses" target_so_ops routine for ia64-hpux. */
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static void
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ia64_hpux_relocate_section_addresses (struct so_list *so,
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struct target_section *sec)
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{
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CORE_ADDR offset = 0;
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/* If we haven't computed the text & data segment addresses, do so now.
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We do this here, because we now have direct access to the associated
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bfd, whereas we would have had to open our own if we wanted to do it
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while processing the library-load event. */
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if (so->lm_info->text_start == 0 && so->lm_info->data_start == 0)
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ia64_hpux_find_start_vma (sec->bfd, &so->lm_info->text_start,
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&so->lm_info->data_start);
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/* Determine the relocation offset based on which segment
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the section belongs to. */
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if ((so->lm_info->text_start < so->lm_info->data_start
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&& sec->addr < so->lm_info->data_start)
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|| (so->lm_info->text_start > so->lm_info->data_start
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&& sec->addr >= so->lm_info->text_start))
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offset = so->lm_info->module_desc.text_base - so->lm_info->text_start;
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else if ((so->lm_info->text_start < so->lm_info->data_start
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&& sec->addr >= so->lm_info->data_start)
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|| (so->lm_info->text_start > so->lm_info->data_start
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&& sec->addr < so->lm_info->text_start))
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offset = so->lm_info->module_desc.data_base - so->lm_info->data_start;
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/* And now apply the relocation. */
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sec->addr += offset;
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sec->endaddr += offset;
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/* Best effort to set addr_high/addr_low. This is used only by
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'info sharedlibrary'. */
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if (so->addr_low == 0 || sec->addr < so->addr_low)
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so->addr_low = sec->addr;
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if (so->addr_high == 0 || sec->endaddr > so->addr_high)
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so->addr_high = sec->endaddr;
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}
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/* The "free_so" target_so_ops routine for ia64-hpux. */
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static void
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ia64_hpux_free_so (struct so_list *so)
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{
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xfree (so->lm_info);
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}
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/* The "clear_solib" target_so_ops routine for ia64-hpux. */
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static void
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ia64_hpux_clear_solib (void)
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{
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struct so_list *so;
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while (so_list_head != NULL)
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{
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so = so_list_head;
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so_list_head = so_list_head->next;
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ia64_hpux_free_so (so);
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xfree (so);
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}
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}
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/* Assuming the inferior just stopped on an EXEC event, return
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the address of the load_info_t structure. */
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static CORE_ADDR
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ia64_hpux_get_load_info_addr (void)
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{
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struct type *data_ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
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CORE_ADDR addr;
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int status;
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/* The address of the load_info_t structure is stored in the 4th
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argument passed to the initial thread of the process (in other
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words, in argv[3]). So get the address of these arguments,
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and extract the 4th one. */
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status = ttrace (TT_PROC_GET_ARGS, ptid_get_pid (inferior_ptid),
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0, (uintptr_t) &addr, sizeof (CORE_ADDR), 0);
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if (status == -1 && errno)
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perror_with_name (_("Unable to get argument list"));
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return (read_memory_typed_address (addr + 3 * 8, data_ptr_type));
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}
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/* A structure used to aggregate some information extracted from
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the dynamic section of the main executable. */
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struct dld_info
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{
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ULONGEST dld_flags;
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CORE_ADDR load_map;
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};
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/* Scan the ".dynamic" section referenced by ABFD and DYN_SECT,
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and extract the information needed to fill in INFO. */
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static void
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ia64_hpux_read_dynamic_info (struct gdbarch *gdbarch, bfd *abfd,
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asection *dyn_sect, struct dld_info *info)
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{
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int sect_size;
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char *buf;
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char *buf_end;
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/* Make sure that info always has initialized data, even if we fail
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to read the syn_sect section. */
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memset (info, 0, sizeof (struct dld_info));
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sect_size = bfd_section_size (abfd, dyn_sect);
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buf = alloca (sect_size);
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buf_end = buf + sect_size;
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if (bfd_seek (abfd, dyn_sect->filepos, SEEK_SET) != 0
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|| bfd_bread (buf, sect_size, abfd) != sect_size)
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error (_("failed to read contents of .dynamic section"));
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for (; buf < buf_end; buf += sizeof (Elf64_Dyn))
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{
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Elf64_Dyn *dynp = (Elf64_Dyn *) buf;
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Elf64_Sxword d_tag;
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d_tag = bfd_h_get_64 (abfd, &dynp->d_tag);
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switch (d_tag)
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{
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case DT_HP_DLD_FLAGS:
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info->dld_flags = bfd_h_get_64 (abfd, &dynp->d_un);
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break;
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case DT_HP_LOAD_MAP:
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{
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CORE_ADDR load_map_addr = bfd_h_get_64 (abfd, &dynp->d_un.d_ptr);
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if (target_read_memory (load_map_addr, (char *) &info->load_map,
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sizeof (info->load_map)) != 0)
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error (_("failed to read load map at %s"),
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paddress (gdbarch, load_map_addr));
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}
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break;
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}
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}
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}
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/* Wrapper around target_read_memory used with libdl. */
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static void *
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ia64_hpux_read_tgt_mem (void *buffer, uint64_t ptr, size_t bufsiz, int ident)
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{
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if (target_read_memory (ptr, (gdb_byte *) buffer, bufsiz) != 0)
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return 0;
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else
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return buffer;
|
|
}
|
|
|
|
/* Create a new so_list object for a shared library, and store that
|
|
new so_list object in our SO_LIST_HEAD list.
|
|
|
|
SO_INDEX is an index specifying the placement of the loaded shared
|
|
library in the dynamic loader's search list. Normally, this index
|
|
is strictly positive, but an index of -1 refers to the loader itself.
|
|
|
|
Return nonzero if the so_list object could be created. A null
|
|
return value with a positive SO_INDEX normally means that there are
|
|
no more entries in the dynamic loader's search list at SO_INDEX or
|
|
beyond. */
|
|
|
|
static int
|
|
ia64_hpux_add_so_from_dld_info (struct dld_info info, int so_index)
|
|
{
|
|
struct load_module_desc module_desc;
|
|
uint64_t so_handle;
|
|
char *so_path;
|
|
struct so_list *so;
|
|
|
|
so_handle = dlgetmodinfo (so_index, &module_desc, sizeof (module_desc),
|
|
ia64_hpux_read_tgt_mem, 0, info.load_map);
|
|
|
|
if (so_handle == 0)
|
|
/* No such entry. We probably reached the end of the list. */
|
|
return 0;
|
|
|
|
so_path = dlgetname (&module_desc, sizeof (module_desc),
|
|
ia64_hpux_read_tgt_mem, 0, info.load_map);
|
|
if (so_path == NULL)
|
|
{
|
|
/* Should never happen, but let's not crash if it does. */
|
|
warning (_("unable to get shared library name, symbols not loaded"));
|
|
return 0;
|
|
}
|
|
|
|
/* Create a new so_list and insert it at the start of our list.
|
|
The order is not extremely important, but it's less work to do so
|
|
at the end of the list. */
|
|
so = new_so_list (so_path, module_desc);
|
|
so->next = so_list_head;
|
|
so_list_head = so;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Assuming we just attached to a process, update our list of shared
|
|
libraries (SO_LIST_HEAD) as well as GDB's list. */
|
|
|
|
static void
|
|
ia64_hpux_solib_add_after_attach (void)
|
|
{
|
|
bfd *abfd;
|
|
asection *dyn_sect;
|
|
struct dld_info info;
|
|
int i;
|
|
|
|
if (symfile_objfile == NULL)
|
|
return;
|
|
|
|
abfd = symfile_objfile->obfd;
|
|
dyn_sect = bfd_get_section_by_name (abfd, ".dynamic");
|
|
|
|
if (dyn_sect == NULL || bfd_section_size (abfd, dyn_sect) == 0)
|
|
return;
|
|
|
|
ia64_hpux_read_dynamic_info (get_objfile_arch (symfile_objfile), abfd,
|
|
dyn_sect, &info);
|
|
|
|
if ((info.dld_flags & DT_HP_DEBUG_PRIVATE) == 0)
|
|
{
|
|
warning (_(
|
|
"The shared libraries were not privately mapped; setting a breakpoint\n\
|
|
in a shared library will not work until you rerun the program.\n\
|
|
Use the following command to enable debugging of shared libraries.\n\
|
|
chatr +dbg enable a.out"));
|
|
}
|
|
|
|
/* Read the symbols of the dynamic loader (dld.so). */
|
|
ia64_hpux_add_so_from_dld_info (info, -1);
|
|
|
|
/* Read the symbols of all the other shared libraries. */
|
|
for (i = 1; ; i++)
|
|
if (!ia64_hpux_add_so_from_dld_info (info, i))
|
|
break; /* End of list. */
|
|
|
|
/* Resync the library list at the core level. */
|
|
solib_add (NULL, 1, ¤t_target, auto_solib_add);
|
|
}
|
|
|
|
/* The "create_inferior_hook" target_so_ops routine for ia64-hpux. */
|
|
|
|
static void
|
|
ia64_hpux_solib_create_inferior_hook (int from_tty)
|
|
{
|
|
CORE_ADDR load_info_addr;
|
|
load_info_t load_info;
|
|
|
|
/* Initially, we were thinking about adding a check that the program
|
|
(accessible through symfile_objfile) was linked against some shared
|
|
libraries, by searching for a ".dynamic" section. However, could
|
|
this break in the case of a statically linked program that later
|
|
uses dlopen? Programs that are fully statically linked are very
|
|
rare, and we will worry about them when we encounter one that
|
|
causes trouble. */
|
|
|
|
/* Set the LI_TRACE flag in the load_info_t structure. This enables
|
|
notifications when shared libraries are being mapped. */
|
|
load_info_addr = ia64_hpux_get_load_info_addr ();
|
|
read_memory (load_info_addr, (gdb_byte *) &load_info, sizeof (load_info));
|
|
load_info.li_flags |= LI_TRACE;
|
|
write_memory (load_info_addr, (gdb_byte *) &load_info, sizeof (load_info));
|
|
|
|
/* If we just attached to our process, some shard libraries have
|
|
already been mapped. Find which ones they are... */
|
|
if (current_inferior ()->attach_flag)
|
|
ia64_hpux_solib_add_after_attach ();
|
|
}
|
|
|
|
/* The "special_symbol_handling" target_so_ops routine for ia64-hpux. */
|
|
|
|
static void
|
|
ia64_hpux_special_symbol_handling (void)
|
|
{
|
|
/* Nothing to do. */
|
|
}
|
|
|
|
/* The "current_sos" target_so_ops routine for ia64-hpux. */
|
|
|
|
static struct so_list *
|
|
ia64_hpux_current_sos (void)
|
|
{
|
|
/* Return a deep copy of our own list. */
|
|
struct so_list *new_head = NULL, *prev_new_so = NULL;
|
|
struct so_list *our_so;
|
|
|
|
for (our_so = so_list_head; our_so != NULL; our_so = our_so->next)
|
|
{
|
|
struct so_list *new_so;
|
|
|
|
new_so = new_so_list (our_so->so_name, our_so->lm_info->module_desc);
|
|
if (prev_new_so != NULL)
|
|
prev_new_so->next = new_so;
|
|
prev_new_so = new_so;
|
|
if (new_head == NULL)
|
|
new_head = new_so;
|
|
}
|
|
|
|
return new_head;
|
|
}
|
|
|
|
/* The "open_symbol_file_object" target_so_ops routine for ia64-hpux. */
|
|
|
|
static int
|
|
ia64_hpux_open_symbol_file_object (void *from_ttyp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* The "in_dynsym_resolve_code" target_so_ops routine for ia64-hpux. */
|
|
|
|
static int
|
|
ia64_hpux_in_dynsym_resolve_code (CORE_ADDR pc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* If FADDR is the address of a function inside one of the shared
|
|
libraries, return the shared library linkage address. */
|
|
|
|
CORE_ADDR
|
|
ia64_hpux_get_solib_linkage_addr (CORE_ADDR faddr)
|
|
{
|
|
struct so_list *so = so_list_head;
|
|
|
|
while (so != NULL)
|
|
{
|
|
struct load_module_desc module_desc = so->lm_info->module_desc;
|
|
|
|
if (module_desc.text_base <= faddr
|
|
&& (module_desc.text_base + module_desc.text_size) > faddr)
|
|
return module_desc.linkage_ptr;
|
|
|
|
so = so->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Create a new target_so_ops structure suitable for ia64-hpux, and
|
|
return its address. */
|
|
|
|
static struct target_so_ops *
|
|
ia64_hpux_target_so_ops (void)
|
|
{
|
|
struct target_so_ops *ops = XZALLOC (struct target_so_ops);
|
|
|
|
ops->relocate_section_addresses = ia64_hpux_relocate_section_addresses;
|
|
ops->free_so = ia64_hpux_free_so;
|
|
ops->clear_solib = ia64_hpux_clear_solib;
|
|
ops->solib_create_inferior_hook = ia64_hpux_solib_create_inferior_hook;
|
|
ops->special_symbol_handling = ia64_hpux_special_symbol_handling;
|
|
ops->current_sos = ia64_hpux_current_sos;
|
|
ops->open_symbol_file_object = ia64_hpux_open_symbol_file_object;
|
|
ops->in_dynsym_resolve_code = ia64_hpux_in_dynsym_resolve_code;
|
|
ops->bfd_open = solib_bfd_open;
|
|
|
|
return ops;
|
|
}
|
|
|
|
/* Prevent warning from -Wmissing-prototypes. */
|
|
void _initialize_solib_ia64_hpux (void);
|
|
|
|
void
|
|
_initialize_solib_ia64_hpux (void)
|
|
{
|
|
ia64_hpux_so_ops = ia64_hpux_target_so_ops ();
|
|
}
|