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/* Target-dependent code for OpenBSD/arm.
Copyright (C) 2006-2020 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 "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, ULONGEST_MAX }, /* add r0, sp, #16 */
{ 0xef000067, ULONGEST_MAX }, /* swi SYS_sigreturn */
{ 0xef000001, ULONGEST_MAX }, /* swi SYS_exit */
{ 0xeafffffc, ULONGEST_MAX }, /* b . - 8 */
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
armobsd_sigframe_init
};
/* Override default thumb breakpoints. */
static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
static const gdb_byte 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_iterate_over_regset_sections
(gdbarch, armbsd_iterate_over_regset_sections);
/* 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;
}
}
void
_initialize_armobsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD,
armobsd_init_abi);
}
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