/* Target-dependent code for OpenBSD/mips64. Copyright (C) 2004-2013 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 "gdb_assert.h" #include "gdb_string.h" #include "mips-tdep.h" #include "solib-svr4.h" /* The MIPS64 Floating-Point Quad-Precision format is similar to big-endian IA-64 Quad-Precision format. */ #define floatformats_mips64_quad floatformats_ia64_quad #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 = gregs; int i; for (i = 0; i < MIPS64OBSD_NUM_REGS; i++) { if (regnum == i || regnum == -1) regcache_raw_supply (regcache, i, regs + i * 8); } } /* OpenBSD/mips64 register set. */ static struct regset mips64obsd_gregset = { NULL, mips64obsd_supply_gregset }; /* Return the appropriate register set for the core section identified by SECT_NAME and SECT_SIZE. */ static const struct regset * mips64obsd_regset_from_core_section (struct gdbarch *gdbarch, const char *sect_name, size_t sect_size) { if (strcmp (sect_name, ".reg") == 0 && sect_size >= MIPS64OBSD_NUM_REGS * 8) return &mips64obsd_gregset; return NULL; } /* 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, -1 }, /* daddiu a0,sp,32 */ { 0x24020067, -1 }, /* li v0,103 */ { 0x0000000c, -1 }, /* syscall */ { 0x0000000d, -1 }, /* break */ { TRAMP_SENTINEL_INSN, -1 } }, 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_regset_from_core_section (gdbarch, mips64obsd_regset_from_core_section); tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe); set_gdbarch_long_double_bit (gdbarch, 128); set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad); /* OpenBSD/mips64 has SVR4-style shared libraries. */ set_solib_svr4_fetch_link_map_offsets (gdbarch, svr4_lp64_fetch_link_map_offsets); } /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_mips64obsd_tdep (void); void _initialize_mips64obsd_tdep (void) { gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF, mips64obsd_init_abi); }