| /* Target-dependent code for OpenBSD/mips64. |
| |
| Copyright (C) 2004-2024 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 "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, |
| const frame_info_ptr &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); |
| } |