gdb/mips64obsd-tdep.c - gdb

Global variables defined

Functions defined

Macros defined

Source code

  1. /* Target-dependent code for OpenBSD/mips64.

  3.    Copyright (C) 2004-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.

  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.

  17.    You should have received a copy of the GNU General Public License
  18.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  20. #include "defs.h"
  21. #include "gdbtypes.h"
  22. #include "osabi.h"
  23. #include "regcache.h"
  24. #include "regset.h"
  25. #include "trad-frame.h"
  26. #include "tramp-frame.h"

  28. #include "obsd-tdep.h"
  29. #include "mips-tdep.h"
  30. #include "solib-svr4.h"

  32. /* The MIPS64 Floating-Point Quad-Precision format is similar to
  33.    big-endian IA-64 Quad-Precision format.  */
  34. ‌#define floatformats_mips64_quad floatformats_ia64_quad

  36. ‌#define MIPS64OBSD_NUM_REGS 73

  38. /* Core file support.  */

  40. /* Supply register REGNUM from the buffer specified by GREGS and LEN
  41.    in the general-purpose register set REGSET to register cache
  42.    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

  44. static void
  45. ‌mips64obsd_supply_gregset (const struct regset *regset,
  46.                            struct regcache *regcache, int regnum,
  47.                            const void *gregs, size_t len)
  48. {
  49.   const char *regs = gregs;
  50.   int i;

  52.   for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
  53.     {
  54.       if (regnum == i || regnum == -1)
  55.         regcache_raw_supply (regcache, i, regs + i * 8);
  56.     }
  57. }

  59. /* OpenBSD/mips64 register set.  */

  61. ‌static const struct regset mips64obsd_gregset =
  62. {
  63.   NULL,
  64.   mips64obsd_supply_gregset
  65. };

  67. /* Iterate over core file register note sections.  */

  69. static void
  70. ‌mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
  71.                                          iterate_over_regset_sections_cb *cb,
  72.                                          void *cb_data,
  73.                                          const struct regcache *regcache)
  74. {
  75.   cb (".reg", MIPS64OBSD_NUM_REGS * 8, &mips64obsd_gregset, NULL, cb_data);
  76. }


  79. /* Signal trampolines.  */

  81. static void
  82. ‌mips64obsd_sigframe_init (const struct tramp_frame *self,
  83.                           struct frame_info *this_frame,
  84.                           struct trad_frame_cache *cache,
  85.                           CORE_ADDR func)
  86. {
  87.   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  88.   CORE_ADDR sp, sigcontext_addr, addr;
  89.   int regnum;

  91.   /* We find the appropriate instance of `struct sigcontext' at a
  92.      fixed offset in the signal frame.  */
  93.   sp = get_frame_register_signed (this_frame,
  94.                                   MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
  95.   sigcontext_addr = sp + 32;

  97.   /* PC.  */
  98.   regnum = mips_regnum (gdbarch)->pc;
  99.   trad_frame_set_reg_addr (cache,
  100.                            regnum + gdbarch_num_regs (gdbarch),
  101.                             sigcontext_addr + 16);

  103.   /* GPRs.  */
  104.   for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
  105.        regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
  106.     trad_frame_set_reg_addr (cache,
  107.                              regnum + gdbarch_num_regs (gdbarch),
  108.                              addr);

  110.   /* HI and LO.  */
  111.   regnum = mips_regnum (gdbarch)->lo;
  112.   trad_frame_set_reg_addr (cache,
  113.                            regnum + gdbarch_num_regs (gdbarch),
  114.                            sigcontext_addr + 280);
  115.   regnum = mips_regnum (gdbarch)->hi;
  116.   trad_frame_set_reg_addr (cache,
  117.                            regnum + gdbarch_num_regs (gdbarch),
  118.                            sigcontext_addr + 288);

  120.   /* TODO: Handle the floating-point registers.  */

  122.   trad_frame_set_id (cache, frame_id_build (sp, func));
  123. }

  125. ‌static const struct tramp_frame mips64obsd_sigframe =
  126. {
  127.   SIGTRAMP_FRAME,
  128.   MIPS_INSN32_SIZE,
  129.   {
  130.     { 0x67a40020, -1 },                /* daddiu  a0,sp,32 */
  131.     { 0x24020067, -1 },                /* li      v0,103 */
  132.     { 0x0000000c, -1 },                /* syscall */
  133.     { 0x0000000d, -1 },                /* break */
  134.     { TRAMP_SENTINEL_INSN, -1 }
  135.   },
  136.   mips64obsd_sigframe_init
  137. };


  140. static void
  141. ‌mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  142. {
  143.   /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
  144.      way GDB works, forces us to pretend we can handle them all.  */

  146.   set_gdbarch_iterate_over_regset_sections
  147.     (gdbarch, mips64obsd_iterate_over_regset_sections);

  149.   tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);

  151.   set_gdbarch_long_double_bit (gdbarch, 128);
  152.   set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);

  154.   obsd_init_abi(info, gdbarch);

  156.   /* OpenBSD/mips64 has SVR4-style shared libraries.  */
  157.   set_solib_svr4_fetch_link_map_offsets
  158.     (gdbarch, svr4_lp64_fetch_link_map_offsets);
  159. }


  162. /* Provide a prototype to silence -Wmissing-prototypes.  */
  163. void _initialize_mips64obsd_tdep (void);

  165. void
  166. ‌_initialize_mips64obsd_tdep (void)
  167. {
  168.   gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD_ELF,
  169.                           mips64obsd_init_abi);
  170. }