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Diffstat (limited to 'gdb/mips64-obsd-tdep.c')
| -rw-r--r-- | gdb/mips64-obsd-tdep.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/gdb/mips64-obsd-tdep.c b/gdb/mips64-obsd-tdep.c new file mode 100644 index 0000000..df8ec0f --- /dev/null +++ b/gdb/mips64-obsd-tdep.c @@ -0,0 +1,170 @@ +/* Target-dependent code for OpenBSD/mips64. + + Copyright (C) 2004-2016 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" + +/* 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 = (const char *) 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 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_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, -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_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_mips64_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); +} + + +/* 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); +} |