[deliverable/binutils-gdb.git] / gdb / armobsd-tdep.c

/* Target-dependent code for OpenBSD/arm.

   Copyright (C) 2006 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 2 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

#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 *next_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 = frame_unwind_register_signed (next_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
};
\f

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;
}

void
_initialize_armobsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
			  armobsd_init_abi);
}
Commit	Line	Data
a58dc200 MK	1	/* Target-dependent code for OpenBSD/arm.
	2
	3	Copyright (C) 2006 Free Software Foundation, Inc.
	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 51 Franklin Street, Fifth Floor,
	20	Boston, MA 02110-1301, USA. */
	21
	22	#include "defs.h"
	23	#include "osabi.h"
e3ac4a1e MK	24	#include "trad-frame.h"
e3ac4a1e MK	25	#include "tramp-frame.h"
a58dc200	26
aa88762a	27	#include "obsd-tdep.h"
a58dc200 MK	28	#include "arm-tdep.h"
	29	#include "solib-svr4.h"
	30
e3ac4a1e MK	31	/* Signal trampolines. */
	32
	33	static void
	34	armobsd_sigframe_init (const struct tramp_frame *self,
	35	struct frame_info *next_frame,
	36	struct trad_frame_cache *cache,
	37	CORE_ADDR func)
	38	{
	39	CORE_ADDR sp, sigcontext_addr, addr;
	40	int regnum;
	41
	42	/* We find the appropriate instance of `struct sigcontext' at a
	43	fixed offset in the signal frame. */
	44	sp = frame_unwind_register_signed (next_frame, ARM_SP_REGNUM);
	45	sigcontext_addr = sp + 16;
	46
	47	/* PC. */
	48	trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
	49
	50	/* GPRs. */
	51	for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
	52	regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
	53	trad_frame_set_reg_addr (cache, regnum, addr);
	54
	55	trad_frame_set_id (cache, frame_id_build (sp, func));
	56	}
	57
	58	static const struct tramp_frame armobsd_sigframe =
	59	{
	60	SIGTRAMP_FRAME,
	61	4,
	62	{
	63	{ 0xe28d0010, -1 }, /* add r0, sp, #16 */
	64	{ 0xef000067, -1 }, /* swi SYS_sigreturn */
	65	{ 0xef000001, -1 }, /* swi SYS_exit */
	66	{ 0xeafffffc, -1 }, /* b . - 8 */
	67	{ TRAMP_SENTINEL_INSN, -1 }
	68	},
	69	armobsd_sigframe_init
	70	};
	71	\f
	72
a58dc200 MK	73	static void
	74	armobsd_init_abi (struct gdbarch_info info,
	75	struct gdbarch *gdbarch)
	76	{
	77	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	78
	79	if (tdep->fp_model == ARM_FLOAT_AUTO)
	80	tdep->fp_model = ARM_FLOAT_SOFT_VFP;
	81
e3ac4a1e MK	82	tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
e3ac4a1e MK	83
a58dc200 MK	84	/* OpenBSD/arm uses SVR4-style shared libraries. */
	85	set_solib_svr4_fetch_link_map_offsets
	86	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
aa88762a	87	set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
a58dc200 MK	88
	89	tdep->jb_pc = 24;
	90	tdep->jb_elt_size = 4;
	91	}
	92
	93	void
	94	_initialize_armobsd_tdep (void)
	95	{
	96	gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
	97	armobsd_init_abi);
	98	}