gdb/gdbserver/linux-sparc-low.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code

  1. /* Low level interface to ptrace, for the remote server for GDB.
  2.    Copyright (C) 1995-2015 Free Software Foundation, Inc.

  4.    This file is part of GDB.

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

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

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

  19. #include "server.h"
  20. #include "linux-low.h"

  22. #include <sys/ptrace.h>

  24. #include "gdb_proc_service.h"

  26. /* The stack pointer is offset from the stack frame by a BIAS of 2047
  27.    (0x7ff) for 64-bit code.  BIAS is likely to be defined on SPARC
  28.    hosts, so undefine it first.  */
  29. ‌#undef BIAS
  30. ‌#define BIAS 2047

  32. #ifdef HAVE_SYS_REG_H
  33. #include <sys/reg.h>
  34. #endif

  36. ‌#define INSN_SIZE 4

  38. ‌#define SPARC_R_REGS_NUM 32
  39. ‌#define SPARC_F_REGS_NUM 48
  40. ‌#define SPARC_CONTROL_REGS_NUM 6

  42. ‌#define sparc_num_regs \
  43.   (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)

  45. /* Each offset is multiplied by 8, because of the register size.
  46.    These offsets apply to the buffer sent/filled by ptrace.
  47.    Additionally, the array elements order corresponds to the .dat file, and the
  48.    gdb's registers enumeration order.  */

  50. ‌static int sparc_regmap[] = {
  51.   /* These offsets correspond to GET/SETREGSET.  */
  52.         -1,  0*8,  1*8,  2*8,  3*8,  4*8,  5*8,  6*8,         /* g0 .. g7 */
  53.         7*8,  8*8,  9*8, 10*8, 11*8, 12*8, 13*8, 14*8,         /* o0 .. o5, sp, o7 */
  54.         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,         /* l0 .. l7 */
  55.         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,         /* i0 .. i5, fp, i7 */

  57.   /* Floating point registers offsets correspond to GET/SETFPREGSET.  */
  58.     0*4,  1*4,  2*4,  3*4,  4*4,  5*4,  6*4,  7*4,           /*  f0 ..  f7 */
  59.     8*4,  9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4,           /*  f8 .. f15 */
  60.    16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4,           /* f16 .. f23 */
  61.    24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4,           /* f24 .. f31 */

  63.   /* F32 offset starts next to f31: 31*4+4 = 16 * 8.  */
  64.    16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8,           /* f32 .. f46 */
  65.    24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8,           /* f48 .. f62 */

  67.    17 *8, /*    pc */
  68.    18 *8, /*   npc */
  69.    16 *8, /* state */
  70.   /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
  71.      next to f62.  */
  72.    32 *8, /*   fsr */
  73.       -1, /*  fprs */
  74.   /* Y register is 32-bits length, but gdb takes care of that.  */
  75.    19 *8, /*     y */

  77. };


  80. ‌struct regs_range_t
  81. {
  82.   int regno_start;
  83.   int regno_end;
  84. };

  86. ‌static const struct regs_range_t gregs_ranges[] = {
  87. {  0, 31 }, /*   g0 .. i7  */
  88. { 80, 82 }, /*   pc .. state */
  89. { 84, 85 }  /* fprs .. y */
  90. };

  92. ‌#define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))

  94. ‌static const struct regs_range_t fpregs_ranges[] = {
  95. { 32, 79 }, /* f0 .. f62  */
  96. { 83, 83 }  /* fsr */
  97. };

  99. ‌#define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))

  101. /* Defined in auto-generated file reg-sparc64.c.  */
  102. void init_registers_sparc64 (void);
  103. extern const struct target_desc *tdesc_sparc64;

  105. static int
  106. ‌sparc_cannot_store_register (int regno)
  107. {
  108.   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
  109. }

  111. static int
  112. ‌sparc_cannot_fetch_register (int regno)
  113. {
  114.   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
  115. }

  117. static void
  118. ‌sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)
  119. {
  120.   int i;
  121.   CORE_ADDR addr = 0;
  122.   unsigned char tmp_reg_buf[8];
  123.   const int l0_regno = find_regno (regcache->tdesc, "l0");
  124.   const int i7_regno = l0_regno + 15;

  126.   /* These registers have to be stored in the stack.  */
  127.   memcpy (&addr,
  128.           ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
  129.           sizeof (addr));

  131.   addr += BIAS;

  133.   for (i = l0_regno; i <= i7_regno; i++)
  134.     {
  135.       collect_register (regcache, i, tmp_reg_buf);
  136.       (*the_target->write_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
  137.       addr += sizeof (tmp_reg_buf);
  138.     }
  139. }

  141. static void
  142. ‌sparc_fill_gregset (struct regcache *regcache, void *buf)
  143. {
  144.   int i;
  145.   int range;

  147.   for (range = 0; range < N_GREGS_RANGES; range++)
  148.     for (i = gregs_ranges[range].regno_start;
  149.          i <= gregs_ranges[range].regno_end; i++)
  150.       if (sparc_regmap[i] != -1)
  151.         collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

  153.   sparc_fill_gregset_to_stack (regcache, buf);
  154. }

  156. static void
  157. ‌sparc_fill_fpregset (struct regcache *regcache, void *buf)
  158. {
  159.   int i;
  160.   int range;

  162.   for (range = 0; range < N_FPREGS_RANGES; range++)
  163.     for (i = fpregs_ranges[range].regno_start;
  164.          i <= fpregs_ranges[range].regno_end; i++)
  165.       collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

  167. }

  169. static void
  170. ‌sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
  171. {
  172.   int i;
  173.   CORE_ADDR addr = 0;
  174.   unsigned char tmp_reg_buf[8];
  175.   const int l0_regno = find_regno (regcache->tdesc, "l0");
  176.   const int i7_regno = l0_regno + 15;

  178.   /* These registers have to be obtained from the stack.  */
  179.   memcpy (&addr,
  180.           ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
  181.           sizeof (addr));

  183.   addr += BIAS;

  185.   for (i = l0_regno; i <= i7_regno; i++)
  186.     {
  187.       (*the_target->read_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
  188.       supply_register (regcache, i, tmp_reg_buf);
  189.       addr += sizeof (tmp_reg_buf);
  190.     }
  191. }

  193. static void
  194. ‌sparc_store_gregset (struct regcache *regcache, const void *buf)
  195. {
  196.   int i;
  197.   char zerobuf[8];
  198.   int range;

  200.   memset (zerobuf, 0, sizeof (zerobuf));

  202.   for (range = 0; range < N_GREGS_RANGES; range++)
  203.     for (i = gregs_ranges[range].regno_start;
  204.          i <= gregs_ranges[range].regno_end; i++)
  205.       if (sparc_regmap[i] != -1)
  206.         supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
  207.       else
  208.         supply_register (regcache, i, zerobuf);

  210.   sparc_store_gregset_from_stack (regcache, buf);
  211. }

  213. static void
  214. ‌sparc_store_fpregset (struct regcache *regcache, const void *buf)
  215. {
  216.   int i;
  217.   int range;

  219.   for (range = 0; range < N_FPREGS_RANGES; range++)
  220.     for (i = fpregs_ranges[range].regno_start;
  221.          i <= fpregs_ranges[range].regno_end;
  222.          i++)
  223.       supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
  224. }

  226. extern int debug_threads;

  228. static CORE_ADDR
  229. ‌sparc_get_pc (struct regcache *regcache)
  230. {
  231.   unsigned long pc;
  232.   collect_register_by_name (regcache, "pc", &pc);
  233.   if (debug_threads)
  234.     debug_printf ("stop pc is %08lx\n", pc);
  235.   return pc;
  236. }

  238. ‌static const unsigned char sparc_breakpoint[INSN_SIZE] = {
  239.   0x91, 0xd0, 0x20, 0x01
  240. };
  241. ‌#define sparc_breakpoint_len INSN_SIZE


  244. static int
  245. ‌sparc_breakpoint_at (CORE_ADDR where)
  246. {
  247.   unsigned char insn[INSN_SIZE];

  249.   (*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn));

  251.   if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
  252.     return 1;

  254.   /* If necessary, recognize more trap instructions here.  GDB only
  255.      uses TRAP Always.  */

  257.   return 0;
  258. }

  260. /* We only place breakpoints in empty marker functions, and thread locking
  261.    is outside of the function.  So rather than importing software single-step,
  262.    we can just run until exit.  */
  263. static CORE_ADDR
  264. ‌sparc_reinsert_addr (void)
  265. {
  266.   struct regcache *regcache = get_thread_regcache (current_thread, 1);
  267.   CORE_ADDR lr;
  268.   /* O7 is the equivalent to the 'lr' of other archs.  */
  269.   collect_register_by_name (regcache, "o7", &lr);
  270.   return lr;
  271. }

  273. static void
  274. ‌sparc_arch_setup (void)
  275. {
  276.   current_process ()->tdesc = tdesc_sparc64;
  277. }

  279. ‌static struct regset_info sparc_regsets[] = {
  280.   { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
  281.     GENERAL_REGS,
  282.     sparc_fill_gregset, sparc_store_gregset },
  283.   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
  284.     FP_REGS,
  285.     sparc_fill_fpregset, sparc_store_fpregset },
  286.   { 0, 0, 0, -1, -1, NULL, NULL }
  287. };

  289. ‌static struct regsets_info sparc_regsets_info =
  290.   {
  291.     sparc_regsets, /* regsets */
  292.     0, /* num_regsets */
  293.     NULL, /* disabled_regsets */
  294.   };

  296. ‌static struct usrregs_info sparc_usrregs_info =
  297.   {
  298.     sparc_num_regs,
  299.     /* No regmap needs to be provided since this impl. doesn't use
  300.        USRREGS.  */
  301.     NULL
  302.   };

  304. ‌static struct regs_info regs_info =
  305.   {
  306.     NULL, /* regset_bitmap */
  307.     &sparc_usrregs_info,
  308.     &sparc_regsets_info
  309.   };

  311. static const struct regs_info *
  312. ‌sparc_regs_info (void)
  313. {
  314.   return &regs_info;
  315. }

  317. ‌struct linux_target_ops the_low_target = {
  318.   sparc_arch_setup,
  319.   sparc_regs_info,
  320.   sparc_cannot_fetch_register,
  321.   sparc_cannot_store_register,
  322.   NULL, /* fetch_register */
  323.   sparc_get_pc,
  324.   /* No sparc_set_pc is needed.  */
  325.   NULL,
  326.   (const unsigned char *) sparc_breakpoint,
  327.   sparc_breakpoint_len,
  328.   sparc_reinsert_addr,
  329.   0,
  330.   sparc_breakpoint_at,
  331.   NULL,  /* supports_z_point_type */
  332.   NULL, NULL, NULL, NULL,
  333.   NULL, NULL
  334. };

  336. void
  337. ‌initialize_low_arch (void)
  338. {
  339.   /* Initialize the Linux target descriptions.  */
  340.   init_registers_sparc64 ();

  342.   initialize_regsets_info (&sparc_regsets_info);
  343. }