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Rebase executable to match relocated base address

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Windows executables linked with -dynamicbase get a new base address
when loaded, which makes debugging impossible if the executable isn't
also rebased in gdb.

The new base address is read from the Process Environment Block.

gdb/ChangeLog:

2020-03-03  Hannes Domani  <ssbssa@yahoo.de>

	* windows-tdep.c (windows_solib_create_inferior_hook): New function.
	(windows_init_abi): Set and use windows_so_ops.
This commit is contained in:
Hannes Domani 2020-02-12 17:53:32 +01:00
parent b8ba138563
commit 584cf46d0a
2 changed files with 59 additions and 1 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2020-03-03 Hannes Domani <ssbssa@yahoo.de>
* windows-tdep.c (windows_solib_create_inferior_hook): New function.
(windows_init_abi): Set and use windows_so_ops.
2020-03-03 Sergio Durigan Junior <sergiodj@redhat.com>
* printcmd.c (print_c_string): Check also for TYPE_CODE_PTR

55
gdb/windows-tdep.c
View File

@ -34,6 +34,9 @@
#include "solib.h"
#include "solib-target.h"
#include "gdbcore.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "solist.h"
/* Windows signal numbers differ between MinGW flavors and between
those and Cygwin. The below enumeration was gleaned from the
@ -812,6 +815,53 @@ windows_get_siginfo_type (struct gdbarch *gdbarch)
return siginfo_type;
}
/* Implement the "solib_create_inferior_hook" target_so_ops method. */
static void
windows_solib_create_inferior_hook (int from_tty)
{
CORE_ADDR exec_base = 0;
/* Find base address of main executable in
TIB->process_environment_block->image_base_address. */
struct gdbarch *gdbarch = target_gdbarch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int ptr_bytes;
int peb_offset; /* Offset of process_environment_block in TIB. */
int base_offset; /* Offset of image_base_address in PEB. */
if (gdbarch_ptr_bit (gdbarch) == 32)
{
ptr_bytes = 4;
peb_offset = 48;
base_offset = 8;
}
else
{
ptr_bytes = 8;
peb_offset = 96;
base_offset = 16;
}
CORE_ADDR tlb;
gdb_byte buf[8];
if (target_get_tib_address (inferior_ptid, &tlb)
&& !target_read_memory (tlb + peb_offset, buf, ptr_bytes))
{
CORE_ADDR peb = extract_unsigned_integer (buf, ptr_bytes, byte_order);
if (!target_read_memory (peb + base_offset, buf, ptr_bytes))
exec_base = extract_unsigned_integer (buf, ptr_bytes, byte_order);
}
/* Rebase executable if the base address changed because of ASLR. */
if (symfile_objfile != nullptr && exec_base != 0)
{
CORE_ADDR vmaddr = pe_data (exec_bfd)->pe_opthdr.ImageBase;
if (vmaddr != exec_base)
objfile_rebase (symfile_objfile, exec_base - vmaddr);
}
}
static struct target_so_ops windows_so_ops;
/* To be called from the various GDB_OSABI_CYGWIN handlers for the
various Windows architectures and machine types. */
@ -830,7 +880,10 @@ windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_gdb_signal_to_target (gdbarch, windows_gdb_signal_to_target);
set_solib_ops (gdbarch, &solib_target_so_ops);
windows_so_ops = solib_target_so_ops;
windows_so_ops.solib_create_inferior_hook
= windows_solib_create_inferior_hook;
set_solib_ops (gdbarch, &windows_so_ops);
set_gdbarch_get_siginfo_type (gdbarch, windows_get_siginfo_type);
}