mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-05 08:14:19 +08:00
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/* Target-dependent code for OpenBSD/arm.
|
||
|
||
Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "osabi.h"
|
||
#include "trad-frame.h"
|
||
#include "tramp-frame.h"
|
||
|
||
#include "gdb_string.h"
|
||
|
||
#include "obsd-tdep.h"
|
||
#include "arm-tdep.h"
|
||
#include "solib-svr4.h"
|
||
|
||
/* Signal trampolines. */
|
||
|
||
static void
|
||
armobsd_sigframe_init (const struct tramp_frame *self,
|
||
struct frame_info *this_frame,
|
||
struct trad_frame_cache *cache,
|
||
CORE_ADDR func)
|
||
{
|
||
CORE_ADDR sp, sigcontext_addr, addr;
|
||
int regnum;
|
||
|
||
/* We find the appropriate instance of `struct sigcontext' at a
|
||
fixed offset in the signal frame. */
|
||
sp = get_frame_register_signed (this_frame, ARM_SP_REGNUM);
|
||
sigcontext_addr = sp + 16;
|
||
|
||
/* PC. */
|
||
trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
|
||
|
||
/* GPRs. */
|
||
for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
|
||
regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
|
||
trad_frame_set_reg_addr (cache, regnum, addr);
|
||
|
||
trad_frame_set_id (cache, frame_id_build (sp, func));
|
||
}
|
||
|
||
static const struct tramp_frame armobsd_sigframe =
|
||
{
|
||
SIGTRAMP_FRAME,
|
||
4,
|
||
{
|
||
{ 0xe28d0010, -1 }, /* add r0, sp, #16 */
|
||
{ 0xef000067, -1 }, /* swi SYS_sigreturn */
|
||
{ 0xef000001, -1 }, /* swi SYS_exit */
|
||
{ 0xeafffffc, -1 }, /* b . - 8 */
|
||
{ TRAMP_SENTINEL_INSN, -1 }
|
||
},
|
||
armobsd_sigframe_init
|
||
};
|
||
|
||
|
||
/* Override default thumb breakpoints. */
|
||
static const char arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
|
||
static const char arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
|
||
|
||
static void
|
||
armobsd_init_abi (struct gdbarch_info info,
|
||
struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
if (tdep->fp_model == ARM_FLOAT_AUTO)
|
||
tdep->fp_model = ARM_FLOAT_SOFT_VFP;
|
||
|
||
tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
|
||
|
||
/* OpenBSD/arm uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
||
set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
|
||
|
||
tdep->jb_pc = 24;
|
||
tdep->jb_elt_size = 4;
|
||
|
||
set_gdbarch_regset_from_core_section
|
||
(gdbarch, armbsd_regset_from_core_section);
|
||
|
||
/* OpenBSD/arm uses -fpcc-struct-return by default. */
|
||
tdep->struct_return = pcc_struct_return;
|
||
|
||
/* Single stepping. */
|
||
set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
|
||
|
||
/* Breakpoints. */
|
||
switch (info.byte_order)
|
||
{
|
||
case BFD_ENDIAN_BIG:
|
||
tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
|
||
tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
|
||
break;
|
||
|
||
case BFD_ENDIAN_LITTLE:
|
||
tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
|
||
tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
static enum gdb_osabi
|
||
armobsd_core_osabi_sniffer (bfd *abfd)
|
||
{
|
||
if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
|
||
return GDB_OSABI_OPENBSD_ELF;
|
||
|
||
return GDB_OSABI_UNKNOWN;
|
||
}
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
extern initialize_file_ftype _initialize_armobsd_tdep;
|
||
|
||
void
|
||
_initialize_armobsd_tdep (void)
|
||
{
|
||
/* BFD doesn't set a flavour for NetBSD style a.out core files. */
|
||
gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
|
||
armobsd_core_osabi_sniffer);
|
||
|
||
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
|
||
armobsd_init_abi);
|
||
}
|