gdb/sparc64fbsd-tdep.c - gdb

Global variables defined

Functions defined

Macros defined

Source code

  1. /* Target-dependent code for FreeBSD/sparc64.

  3.    Copyright (C) 2003-2015 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 "frame.h"
  22. #include "frame-unwind.h"
  23. #include "gdbcore.h"
  24. #include "osabi.h"
  25. #include "regcache.h"
  26. #include "regset.h"
  27. #include "target.h"
  28. #include "trad-frame.h"

  30. #include "sparc64-tdep.h"
  31. #include "fbsd-tdep.h"
  32. #include "solib-svr4.h"

  34. /* From <machine/reg.h>.  */
  35. ‌const struct sparc_gregmap sparc64fbsd_gregmap =
  36. {
  37.   26 * 8,                        /* "tstate" */
  38.   25 * 8,                        /* %pc */
  39.   24 * 8,                        /* %npc */
  40.   28 * 8,                        /* %y */
  41.   16 * 8,                        /* %fprs */
  42.   -1,
  43.   1 * 8,                        /* %g1 */
  44.   -1,                                /* %l0 */
  45.   8                                /* sizeof (%y) */
  46. };


  49. static void
  50. ‌sparc64fbsd_supply_gregset (const struct regset *regset,
  51.                             struct regcache *regcache,
  52.                             int regnum, const void *gregs, size_t len)
  53. {
  54.   sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  55. }

  57. static void
  58. ‌sparc64fbsd_collect_gregset (const struct regset *regset,
  59.                              const struct regcache *regcache,
  60.                              int regnum, void *gregs, size_t len)
  61. {
  62.   sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  63. }

  65. static void
  66. ‌sparc64fbsd_supply_fpregset (const struct regset *regset,
  67.                              struct regcache *regcache,
  68.                              int regnum, const void *fpregs, size_t len)
  69. {
  70.   sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  71. }

  73. static void
  74. ‌sparc64fbsd_collect_fpregset (const struct regset *regset,
  75.                               const struct regcache *regcache,
  76.                               int regnum, void *fpregs, size_t len)
  77. {
  78.   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  79. }


  82. /* Signal trampolines.  */

  84. static int
  85. ‌sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
  86. {
  87.   return (name && strcmp (name, "__sigtramp") == 0);
  88. }

  90. static struct sparc_frame_cache *
  91. ‌sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  92.                                    void **this_cache)
  93. {
  94.   struct sparc_frame_cache *cache;
  95.   CORE_ADDR addr, mcontext_addr, sp;
  96.   LONGEST fprs;
  97.   int regnum;

  99.   if (*this_cache)
  100.     return *this_cache;

  102.   cache = sparc_frame_cache (this_frame, this_cache);
  103.   gdb_assert (cache == *this_cache);

  105.   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);

  107.   /* The third argument is a pointer to an instance of `ucontext_t',
  108.      which has a member `uc_mcontext' that contains the saved
  109.      registers.  */
  110.   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
  111.   mcontext_addr = addr + 64;

  113.   /* The following registers travel in the `mc_local' slots of
  114.      `mcontext_t'.  */
  115.   addr = mcontext_addr + 16 * 8;
  116.   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
  117.   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;

  119.   /* The following registers travel in the `mc_in' slots of
  120.      `mcontext_t'.  */
  121.   addr = mcontext_addr + 24 * 8;
  122.   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
  123.   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
  124.   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
  125.   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;

  127.   /* The `global' and `out' registers travel in the `mc_global' and
  128.      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
  129.      always zero, keep the identity encoding.  */
  130.   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
  131.        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
  132.     cache->saved_regs[regnum].addr = addr;

  134.   /* The `local' and `in' registers have been saved in the register
  135.      save area.  */
  136.   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
  137.   sp = get_frame_memory_unsigned (this_frame, addr, 8);
  138.   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
  139.        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
  140.     cache->saved_regs[regnum].addr = addr;

  142.   /* The floating-point registers are only saved if the FEF bit in
  143.      %fprs has been set.  */

  145. ‌#define FPRS_FEF        (1 << 2)

  147.   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
  148.   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
  149.   if (fprs & FPRS_FEF)
  150.     {
  151.       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
  152.            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
  153.         cache->saved_regs[regnum].addr = addr;

  155.       for (regnum = SPARC64_F32_REGNUM;
  156.            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
  157.         cache->saved_regs[regnum].addr = addr;
  158.     }

  160.   return cache;
  161. }

  163. static void
  164. ‌sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
  165.                                     void **this_cache,
  166.                                     struct frame_id *this_id)
  167. {
  168.   struct sparc_frame_cache *cache =
  169.     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

  171.   (*this_id) = frame_id_build (cache->base, cache->pc);
  172. }

  174. static struct value *
  175. ‌sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
  176.                                           void **this_cache, int regnum)
  177. {
  178.   struct sparc_frame_cache *cache =
  179.     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

  181.   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
  182. }

  184. static int
  185. ‌sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
  186.                                     struct frame_info *this_frame,
  187.                                     void **this_cache)
  188. {
  189.   CORE_ADDR pc = get_frame_pc (this_frame);
  190.   const char *name;

  192.   find_pc_partial_function (pc, &name, NULL, NULL);
  193.   if (sparc64fbsd_pc_in_sigtramp (pc, name))
  194.     return 1;

  196.   return 0;
  197. }

  199. ‌static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
  200. {
  201.   SIGTRAMP_FRAME,
  202.   default_frame_unwind_stop_reason,
  203.   sparc64fbsd_sigtramp_frame_this_id,
  204.   sparc64fbsd_sigtramp_frame_prev_register,
  205.   NULL,
  206.   sparc64fbsd_sigtramp_frame_sniffer
  207. };


  210. ‌static const struct regset sparc64fbsd_gregset =
  211.   {
  212.     NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
  213.   };

  215. ‌static const struct regset sparc64fbsd_fpregset =
  216.   {
  217.     NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
  218.   };

  220. static void
  221. ‌sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  222. {
  223.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  225.   /* Generic FreeBSD support. */
  226.   fbsd_init_abi (info, gdbarch);

  228.   tdep->gregset = &sparc64fbsd_gregset;
  229.   tdep->sizeof_gregset = 256;

  231.   tdep->fpregset = &sparc64fbsd_fpregset;
  232.   tdep->sizeof_fpregset = 272;

  234.   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);

  236.   sparc64_init_abi (info, gdbarch);

  238.   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
  239.   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
  240.   set_solib_svr4_fetch_link_map_offsets
  241.     (gdbarch, svr4_lp64_fetch_link_map_offsets);
  242. }

  244. /* Provide a prototype to silence -Wmissing-prototypes.  */
  245. void _initialize_sparc64fbsd_tdep (void);

  247. void
  248. ‌_initialize_sparc64fbsd_tdep (void)
  249. {
  250.   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
  251.                           GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
  252. }