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solib-darwin.c: handle PIE when attaching processes.

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gdb/ChangeLog:

        * solib-darwin.c (darwin_current_sos): Fix indentation.
        (darwin_read_exec_load_addr): New function.
        (darwin_solib_create_inferior_hook): Rebase executable.
        * objfiles.c (objfile_rebase1, objfile_rebase): New functions.
        * objfiles.h (objfile_rebase1, objfile_rebase): Add prototypes.
This commit is contained in:
Joel Brobecker
2012-12-18 06:19:54 +00:00
parent c0fc7f8be2
commit 4141a416dd
4 changed files with 128 additions and 2 deletions
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82
gdb/solib-darwin.c
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@ -331,6 +331,51 @@ darwin_current_sos (void)
return head;
}
/* Get the load address of the executable. We assume that the dyld info are
correct. */
static CORE_ADDR
darwin_read_exec_load_addr (struct darwin_info *info)
{
struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
int ptr_len = TYPE_LENGTH (ptr_type);
unsigned int image_info_size = ptr_len * 3;
int i;
/* Read infos for each solib. One of them should be the executable. */
for (i = 0; i < info->all_image.count; i++)
{
CORE_ADDR iinfo = info->all_image.info + i * image_info_size;
char buf[image_info_size];
CORE_ADDR load_addr;
struct mach_o_header_external hdr;
unsigned long hdr_val;
/* Read image info from inferior. */
if (target_read_memory (iinfo, buf, image_info_size))
break;
load_addr = extract_typed_address (buf, ptr_type);
/* Read Mach-O header from memory. */
if (target_read_memory (load_addr, (char *) &hdr, sizeof (hdr) - 4))
break;
/* Discard wrong magic numbers. Shouldn't happen. */
hdr_val = extract_unsigned_integer
(hdr.magic, sizeof (hdr.magic), byte_order);
if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64)
continue;
/* Check executable. */
hdr_val = extract_unsigned_integer
(hdr.filetype, sizeof (hdr.filetype), byte_order);
if (hdr_val == BFD_MACH_O_MH_EXECUTE)
return load_addr;
}
return 0;
}
/* Return 1 if PC lies in the dynamic symbol resolution code of the
run time loader. */
@ -456,6 +501,7 @@ static void
darwin_solib_create_inferior_hook (int from_tty)
{
struct darwin_info *info = get_darwin_info ();
CORE_ADDR load_addr;
info->all_image_addr = 0;
@ -469,8 +515,40 @@ darwin_solib_create_inferior_hook (int from_tty)
darwin_load_image_infos (info);
if (darwin_dyld_version_ok (info))
create_solib_event_breakpoint (target_gdbarch (), info->all_image.notifier);
if (!darwin_dyld_version_ok (info))
return;
create_solib_event_breakpoint (target_gdbarch (), info->all_image.notifier);
/* Possible relocate the main executable (PIE). */
load_addr = darwin_read_exec_load_addr (info);
if (load_addr != 0 && symfile_objfile != NULL)
{
CORE_ADDR vmaddr = 0;
struct mach_o_data_struct *md = bfd_mach_o_get_data (exec_bfd);
unsigned int i, num;
/* Find the base address of the executable. */
for (i = 0; i < md->header.ncmds; i++)
{
struct bfd_mach_o_load_command *cmd = &md->commands[i];
if (cmd->type != BFD_MACH_O_LC_SEGMENT
&& cmd->type != BFD_MACH_O_LC_SEGMENT_64)
continue;
if (cmd->command.segment.fileoff == 0
&& cmd->command.segment.vmaddr != 0
&& cmd->command.segment.filesize != 0)
{
vmaddr = cmd->command.segment.vmaddr;
break;
}
}
/* Relocate. */
if (vmaddr != load_addr)
objfile_rebase (symfile_objfile, load_addr - vmaddr);
}
}
static void