gdb/sparc-ravenscar-thread.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Ravenscar SPARC target support.

  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 "gdbcore.h"
  22. #include "regcache.h"
  23. #include "sparc-tdep.h"
  24. #include "inferior.h"
  25. #include "ravenscar-thread.h"
  26. #include "sparc-ravenscar-thread.h"

  28. static void sparc_ravenscar_fetch_registers (struct regcache *regcache,
  29.                                              int regnum);
  30. static void sparc_ravenscar_store_registers (struct regcache *regcache,
  31.                                              int regnum);
  32. static void sparc_ravenscar_prepare_to_store (struct regcache *regcache);

  34. /* Register offsets from a referenced address (exempli gratia the
  35.    Thread_Descriptor).  The referenced address depends on the register
  36.    number.  The Thread_Descriptor layout and the stack layout are documented
  37.    in the GNAT sources, in sparc-bb.h.  */

  39. ‌static const int sparc_register_offsets[] =
  40. {
  41.   /* G0 - G7 */
  42.   -1,   0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  43.   /* O0 - O7 */
  44.   0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  45.   /* L0 - L7 */
  46.   0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
  47.   /* I0 - I7 */
  48.   0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
  49.   /* F0 - F31 */
  50.   0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
  51.   0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
  52.   0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
  53.   0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
  54.   /* Y  PSR   WIM   TBR   PC    NPC   FPSR  CPSR */
  55.   0x40, 0x20, 0x44, -1,   0x1C, -1,   0x4C, -1
  56. };

  58. /* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
  59.    regcache.  */

  61. static void
  62. ‌supply_register_at_address (struct regcache *regcache, int regnum,
  63.                             CORE_ADDR register_addr)
  64. {
  65.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  66.   int buf_size = register_size (gdbarch, regnum);
  67.   gdb_byte *buf;

  69.   buf = alloca (buf_size);
  70.   read_memory (register_addr, buf, buf_size);
  71.   regcache_raw_supply (regcache, regnum, buf);
  72. }

  74. /* Return true if, for a non-running thread, REGNUM has been saved on the
  75.    stack.  */

  77. static int
  78. ‌register_on_stack_p (int regnum)
  79. {
  80.   return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  81.     || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
  82. }

  84. /* Return true if, for a non-running thread, REGNUM has been saved on the
  85.    Thread_Descriptor.  */

  87. static int
  88. ‌register_in_thread_descriptor_p (int regnum)
  89. {
  90.   return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  91.     || (regnum == SPARC32_PSR_REGNUM)
  92.     || (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  93.     || (regnum == SPARC32_Y_REGNUM)
  94.     || (regnum == SPARC32_WIM_REGNUM)
  95.     || (regnum == SPARC32_FSR_REGNUM)
  96.     || (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
  97.     || (regnum == SPARC32_PC_REGNUM);
  98. }

  100. /* to_fetch_registers when inferior_ptid is different from the running
  101.    thread.  */

  103. static void
  104. ‌sparc_ravenscar_fetch_registers (struct regcache *regcache, int regnum)
  105. {
  106.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  107.   const int sp_regnum = gdbarch_sp_regnum (gdbarch);
  108.   const int num_regs = gdbarch_num_regs (gdbarch);
  109.   int current_regnum;
  110.   CORE_ADDR current_address;
  111.   CORE_ADDR thread_descriptor_address;
  112.   ULONGEST stack_address;

  114.   /* The tid is the thread_id field, which is a pointer to the thread.  */
  115.   thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid);

  117.   /* Read the saved SP in the context buffer.  */
  118.   current_address = thread_descriptor_address
  119.     + sparc_register_offsets [sp_regnum];
  120.   supply_register_at_address (regcache, sp_regnum, current_address);
  121.   regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);

  123.   /* Read registers.  */
  124.   for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
  125.     {
  126.       if (register_in_thread_descriptor_p (current_regnum))
  127.         {
  128.           current_address = thread_descriptor_address
  129.             + sparc_register_offsets [current_regnum];
  130.           supply_register_at_address (regcache, current_regnum,
  131.                                       current_address);
  132.         }
  133.       else if (register_on_stack_p (current_regnum))
  134.         {
  135.           current_address = stack_address
  136.             + sparc_register_offsets [current_regnum];
  137.           supply_register_at_address (regcache, current_regnum,
  138.                                       current_address);
  139.         }
  140.     }
  141. }

  143. /* to_prepare_to_store when inferior_ptid is different from the running
  144.    thread.  */

  146. static void
  147. ‌sparc_ravenscar_prepare_to_store (struct regcache *regcache)
  148. {
  149.   /* Nothing to do.  */
  150. }

  152. /* to_store_registers when inferior_ptid is different from the running
  153.    thread.  */

  155. static void
  156. ‌sparc_ravenscar_store_registers (struct regcache *regcache, int regnum)
  157. {
  158.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  159.   int buf_size = register_size (gdbarch, regnum);
  160.   gdb_byte buf[buf_size];
  161.   ULONGEST register_address;

  163.   if (register_in_thread_descriptor_p (regnum))
  164.     register_address =
  165.       ptid_get_tid (inferior_ptid) + sparc_register_offsets [regnum];
  166.   else if (register_on_stack_p (regnum))
  167.     {
  168.       regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
  169.                                      &register_address);
  170.       register_address += sparc_register_offsets [regnum];
  171.     }
  172.   else
  173.     return;

  175.   regcache_raw_collect (regcache, regnum, buf);
  176.   write_memory (register_address,
  177.                 buf,
  178.                 buf_size);
  179. }

  181. ‌static struct ravenscar_arch_ops sparc_ravenscar_ops =
  182. {
  183.   sparc_ravenscar_fetch_registers,
  184.   sparc_ravenscar_store_registers,
  185.   sparc_ravenscar_prepare_to_store
  186. };

  188. /* Register ravenscar_arch_ops in GDBARCH.  */

  190. void
  191. ‌register_sparc_ravenscar_ops (struct gdbarch *gdbarch)
  192. {
  193.   set_gdbarch_ravenscar_ops (gdbarch, &sparc_ravenscar_ops);
  194. }