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- /* Target-dependent code for OpenBSD/mips64.
- Copyright (C) 2004-2022 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 "gdbtypes.h"
- #include "osabi.h"
- #include "regcache.h"
- #include "regset.h"
- #include "trad-frame.h"
- #include "tramp-frame.h"
- #include "obsd-tdep.h"
- #include "mips-tdep.h"
- #include "solib-svr4.h"
- #define MIPS64OBSD_NUM_REGS 73
- /* Core file support. */
- /* Supply register REGNUM from the buffer specified by GREGS and LEN
- in the general-purpose register set REGSET to register cache
- REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
- static void
- mips64obsd_supply_gregset (const struct regset *regset,
- struct regcache *regcache, int regnum,
- const void *gregs, size_t len)
- {
- const char *regs = (const char *) gregs;
- int i;
- for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
- {
- if (regnum == i || regnum == -1)
- regcache->raw_supply (i, regs + i * 8);
- }
- }
- /* OpenBSD/mips64 register set. */
- static const struct regset mips64obsd_gregset =
- {
- NULL,
- mips64obsd_supply_gregset
- };
- /* Iterate over core file register note sections. */
- static void
- mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
- {
- cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8,
- &mips64obsd_gregset, NULL, cb_data);
- }
- /* Signal trampolines. */
- static void
- mips64obsd_sigframe_init (const struct tramp_frame *self,
- struct frame_info *this_frame,
- struct trad_frame_cache *cache,
- CORE_ADDR func)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_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 = get_frame_register_signed (this_frame,
- MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
- sigcontext_addr = sp + 32;
- /* PC. */
- regnum = mips_regnum (gdbarch)->pc;
- trad_frame_set_reg_addr (cache,
- regnum + gdbarch_num_regs (gdbarch),
- 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 + gdbarch_num_regs (gdbarch),
- addr);
- /* HI and LO. */
- regnum = mips_regnum (gdbarch)->lo;
- trad_frame_set_reg_addr (cache,
- regnum + gdbarch_num_regs (gdbarch),
- sigcontext_addr + 280);
- regnum = mips_regnum (gdbarch)->hi;
- trad_frame_set_reg_addr (cache,
- regnum + gdbarch_num_regs (gdbarch),
- 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, ULONGEST_MAX }, /* daddiu a0,sp,32 */
- { 0x24020067, ULONGEST_MAX }, /* li v0,103 */
- { 0x0000000c, ULONGEST_MAX }, /* syscall */
- { 0x0000000d, ULONGEST_MAX }, /* break */
- { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
- },
- mips64obsd_sigframe_init
- };
- 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_iterate_over_regset_sections
- (gdbarch, mips64obsd_iterate_over_regset_sections);
- tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
- set_gdbarch_long_double_bit (gdbarch, 128);
- set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad);
- obsd_init_abi(info, gdbarch);
- /* OpenBSD/mips64 has SVR4-style shared libraries. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, svr4_lp64_fetch_link_map_offsets);
- }
- void _initialize_mips64obsd_tdep ();
- void
- _initialize_mips64obsd_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
- mips64obsd_init_abi);
- }
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