gdb/sh-linux-tdep.c - gdb

Global variables defined

Functions defined

Macros defined

Source code

  1. /* Target-dependent code for GNU/Linux Super-H.

  3.    Copyright (C) 2005-2015 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 "osabi.h"

  23. #include "solib-svr4.h"
  24. #include "symtab.h"

  26. #include "trad-frame.h"
  27. #include "tramp-frame.h"

  29. #include "glibc-tdep.h"
  30. #include "sh-tdep.h"
  31. #include "linux-tdep.h"

  33. ‌#define REGSx16(base) \
  34.   {(base),      0}, \
  35.   {(base) +  1, 4}, \
  36.   {(base) +  2, 8}, \
  37.   {(base) +  3, 12}, \
  38.   {(base) +  4, 16}, \
  39.   {(base) +  5, 20}, \
  40.   {(base) +  6, 24}, \
  41.   {(base) +  7, 28}, \
  42.   {(base) +  8, 32}, \
  43.   {(base) +  9, 36}, \
  44.   {(base) + 10, 40}, \
  45.   {(base) + 11, 44}, \
  46.   {(base) + 12, 48}, \
  47.   {(base) + 13, 52}, \
  48.   {(base) + 14, 56}, \
  49.   {(base) + 15, 60}

  51. /* Describe the contents of the .reg section of the core file.  */

  53. ‌static const struct sh_corefile_regmap gregs_table[] =
  54. {
  55.   REGSx16 (R0_REGNUM),
  56.   {PC_REGNUM,   64},
  57.   {PR_REGNUM,   68},
  58.   {SR_REGNUM,   72},
  59.   {GBR_REGNUM,  76},
  60.   {MACH_REGNUM, 80},
  61.   {MACL_REGNUM, 84},
  62.   {-1 /* Terminator.  */, 0}
  63. };

  65. /* Describe the contents of the .reg2 section of the core file.  */

  67. ‌static const struct sh_corefile_regmap fpregs_table[] =
  68. {
  69.   REGSx16 (FR0_REGNUM),
  70.   /* REGSx16 xfp_regs omitted.  */
  71.   {FPSCR_REGNUM, 128},
  72.   {FPUL_REGNUM,  132},
  73.   {-1 /* Terminator.  */, 0}
  74. };

  76. /* SH signal handler frame support.  */

  78. static void
  79. ‌sh_linux_sigtramp_cache (struct frame_info *this_frame,
  80.                          struct trad_frame_cache *this_cache,
  81.                          CORE_ADDR func, int regs_offset)
  82. {
  83.   int i;
  84.   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  85.   CORE_ADDR base = get_frame_register_unsigned (this_frame,
  86.                                                 gdbarch_sp_regnum (gdbarch));
  87.   CORE_ADDR regs = base + regs_offset;

  89.   for (i = 0; i < 18; i++)
  90.     trad_frame_set_reg_addr (this_cache, i, regs + i * 4);

  92.   trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4);
  93.   trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4);
  94.   trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4);
  95.   trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4);

  97.   /* Restore FP state if we have an FPU.  */
  98.   if (gdbarch_fp0_regnum (gdbarch) != -1)
  99.     {
  100.       CORE_ADDR fpregs = regs + 22 * 4;
  101.       for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++)
  102.         trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4);
  103.       trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4);
  104.       trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4);
  105.     }

  107.   /* Save a frame ID.  */
  108.   trad_frame_set_id (this_cache, frame_id_build (base, func));
  109. }

  111. /* Implement struct tramp_frame "init" callbacks for signal
  112.    trampolines on 32-bit SH.  */

  114. static void
  115. ‌sh_linux_sigreturn_init (const struct tramp_frame *self,
  116.                          struct frame_info *this_frame,
  117.                          struct trad_frame_cache *this_cache,
  118.                          CORE_ADDR func)
  119. {
  120.   /* SH 32-bit sigframe: sigcontext at start of sigframe,
  121.      registers start after a single 'oldmask' word.  */
  122.   sh_linux_sigtramp_cache (this_frame, this_cache, func, 4);
  123. }

  125. static void
  126. ‌sh_linux_rt_sigreturn_init (const struct tramp_frame *self,
  127.                             struct frame_info *this_frame,
  128.                             struct trad_frame_cache *this_cache,
  129.                             CORE_ADDR func)
  130. {
  131.   /* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then
  132.      we can find sigcontext embedded within a ucontext (offset 20 bytes).
  133.      Then registers start after a single 'oldmask' word.  */
  134.   sh_linux_sigtramp_cache (this_frame, this_cache, func,
  135.                            128 /* sizeof (struct siginfo)  */
  136.                            + 20 /* offsetof (struct ucontext, uc_mcontext) */
  137.                            + 4 /* oldmask word at start of sigcontext */);
  138. }

  140. /* Instruction patterns.  */
  141. ‌#define SH_MOVW     0x9305
  142. ‌#define SH_TRAP     0xc300
  143. ‌#define SH_OR_R0_R0 0x200b

  145. /* SH sigreturn syscall numbers.  */
  146. ‌#define SH_NR_SIGRETURN 0x0077
  147. ‌#define SH_NR_RT_SIGRETURN 0x00ad

  149. ‌static struct tramp_frame sh_linux_sigreturn_tramp_frame = {
  150.   SIGTRAMP_FRAME,
  151.   2,
  152.   {
  153.     { SH_MOVW, 0xffff },
  154.     { SH_TRAP, 0xff00 }, /* #imm argument part filtered out.  */
  155.     { SH_OR_R0_R0, 0xffff },
  156.     { SH_OR_R0_R0, 0xffff },
  157.     { SH_OR_R0_R0, 0xffff },
  158.     { SH_OR_R0_R0, 0xffff },
  159.     { SH_OR_R0_R0, 0xffff },
  160.     { SH_NR_SIGRETURN, 0xffff },
  161.     { TRAMP_SENTINEL_INSN }
  162.   },
  163.   sh_linux_sigreturn_init
  164. };

  166. ‌static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = {
  167.   SIGTRAMP_FRAME,
  168.   2,
  169.   {
  170.     { SH_MOVW, 0xffff },
  171.     { SH_TRAP, 0xff00 }, /* #imm argument part filtered out.  */
  172.     { SH_OR_R0_R0, 0xffff },
  173.     { SH_OR_R0_R0, 0xffff },
  174.     { SH_OR_R0_R0, 0xffff },
  175.     { SH_OR_R0_R0, 0xffff },
  176.     { SH_OR_R0_R0, 0xffff },
  177.     { SH_NR_RT_SIGRETURN, 0xffff },
  178.     { TRAMP_SENTINEL_INSN }
  179.   },
  180.   sh_linux_rt_sigreturn_init
  181. };

  183. static void
  184. ‌sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  185. {
  186.   linux_init_abi (info, gdbarch);

  188.   /* GNU/Linux uses SVR4-style shared libraries.  */
  189.   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
  190.   set_solib_svr4_fetch_link_map_offsets
  191.     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  192.   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);

  194.   set_gdbarch_fetch_tls_load_module_address (gdbarch,
  195.                                              svr4_fetch_objfile_link_map);

  197.   /* Core files and signal handler frame unwinding are supported for
  198.      32-bit SH only, at present.  */
  199.   if (info.bfd_arch_info->mach != bfd_mach_sh5)
  200.     {
  201.       struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  203.       /* Remember regset characteristics.  The sizes should match
  204.          elf_gregset_t and elf_fpregset_t from Linux.  */
  205.       tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table;
  206.       tdep->sizeof_gregset = 92;
  207.       tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table;
  208.       tdep->sizeof_fpregset = 136;

  210.       tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame);
  211.       tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
  212.     }
  213. }

  215. /* Provide a prototype to silence -Wmissing-prototypes.  */
  216. extern void _initialize_sh_linux_tdep (void);

  218. void
  219. ‌_initialize_sh_linux_tdep (void)
  220. {
  221.   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi);
  222. }