/* Target-dependent code for OpenBSD/mips64.
- Copyright 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GDB.
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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "gdb_assert.h"
#include "gdb_string.h"
#include "mips-tdep.h"
}
\f
+/* Signal trampolines. */
+
+static void
+mips64obsd_sigframe_init (const struct tramp_frame *self,
+ struct frame_info *next_frame,
+ struct trad_frame_cache *cache,
+ CORE_ADDR func)
+{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ 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, MIPS_SP_REGNUM + NUM_REGS);
+ sigcontext_addr = sp + 32;
+
+ /* PC. */
+ regnum = mips_regnum (gdbarch)->pc;
+ trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 16);
+
+ /* GPRs. */
+ for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
+ regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
+ trad_frame_set_reg_addr (cache, regnum + NUM_REGS, addr);
+
+ /* HI and LO. */
+ regnum = mips_regnum (gdbarch)->lo;
+ trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 280);
+ regnum = mips_regnum (gdbarch)->hi;
+ trad_frame_set_reg_addr (cache, regnum + NUM_REGS, sigcontext_addr + 288);
+
+ /* TODO: Handle the floating-point registers. */
+
+ trad_frame_set_id (cache, frame_id_build (sp, func));
+}
+
+static const struct tramp_frame mips64obsd_sigframe =
+{
+ SIGTRAMP_FRAME,
+ MIPS_INSN32_SIZE,
+ {
+ { 0x67a40020, -1 }, /* daddiu a0,sp,32 */
+ { 0x24020067, -1 }, /* li v0,103 */
+ { 0x0000000c, -1 }, /* syscall */
+ { 0x0000000d, -1 }, /* break */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ mips64obsd_sigframe_init
+};
+
+\f
static void
mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
+ /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
+ way GDB works, forces us to pretend we can handle them all. */
+
set_gdbarch_regset_from_core_section
(gdbarch, mips64obsd_regset_from_core_section);
- set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
+ tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
+ /* OpenBSD/mips64 has SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
}