gdb/gdbserver/linux-sparc-low.c

   1 /* Low level interface to ptrace, for the remote server for GDB.
   2    Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3    2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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/>.  */
  19
  20 #include "server.h"
  21 #include "linux-low.h"
  22
  23 #include <sys/ptrace.h>
  24
  25 #include "gdb_proc_service.h"
  26
  27 /* The stack pointer is offset from the stack frame by a BIAS of 2047
  28    (0x7ff) for 64-bit code.  BIAS is likely to be defined on SPARC
  29    hosts, so undefine it first.  */
  30 #undef BIAS
  31 #define BIAS 2047
  32
  33 #ifdef HAVE_SYS_REG_H
  34 #include <sys/reg.h>
  35 #endif
  36
  37 #define INSN_SIZE 4
  38
  39 #define SPARC_R_REGS_NUM 32
  40 #define SPARC_F_REGS_NUM 48
  41 #define SPARC_CONTROL_REGS_NUM 6
  42
  43 #define sparc_num_regs (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
  44
  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.  */
  49
  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 */
  56
  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 */
  62
  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 */
  66
  67    17 *8, /*    pc */
  68    18 *8, /*   npc */
  69    16 *8, /* state */
  70   /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed next to f62.  */
  71    32 *8, /*   fsr */
  72       -1, /*  fprs */
  73   /* Y register is 32-bits length, but gdb takes care of that.  */
  74    19 *8, /*     y */
  75
  76 };
  77
  78
  79 struct regs_range_t
  80 {
  81   int regno_start;
  82   int regno_end;
  83 };
  84
  85 static const struct regs_range_t gregs_ranges[] = {
  86  {  0, 31 }, /*   g0 .. i7  */
  87  { 80, 82 }, /*   pc .. state */
  88  { 84, 85 }  /* fprs .. y */
  89 };
  90
  91 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
  92
  93 static const struct regs_range_t fpregs_ranges[] = {
  94  { 32, 79 }, /* f0 .. f62  */
  95  { 83, 83 }  /* fsr */
  96 };
  97
  98 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
  99
 100 /* Defined in auto-generated file reg-sparc64.c.  */
 101 void init_registers_sparc64 (void);
 102
 103 static int
 104 sparc_cannot_store_register (int regno)
 105 {
 106   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
 107 }
 108
 109 static int
 110 sparc_cannot_fetch_register (int regno)
 111 {
 112   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
 113 }
 114
 115 static void
 116 sparc_fill_gregset_to_stack (const void *buf)
 117 {
 118   int i;
 119   CORE_ADDR addr = 0;
 120   unsigned char tmp_reg_buf[8];
 121   const int l0_regno = find_regno("l0");
 122   const int i7_regno = l0_regno + 15;
 123
 124   /* These registers have to be stored in the stack.  */
 125   memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr));
 126
 127   addr += BIAS;
 128
 129   for (i = l0_regno; i <= i7_regno; i++)
 130     {
 131       collect_register (i, tmp_reg_buf);
 132       (*the_target->write_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf));
 133       addr += sizeof(tmp_reg_buf);
 134     }
 135 }
 136
 137 static void
 138 sparc_fill_gregset (void *buf)
 139 {
 140   int i;
 141   int range;
 142
 143   for (range = 0; range < N_GREGS_RANGES; range++)
 144     for (i = gregs_ranges[range].regno_start; i <= gregs_ranges[range].regno_end; i++)
 145       if (sparc_regmap[i] != -1)
 146         collect_register (i, ((char *) buf) + sparc_regmap[i]);
 147
 148   sparc_fill_gregset_to_stack (buf);
 149 }
 150
 151 static void
 152 sparc_fill_fpregset (void *buf)
 153 {
 154   int i;
 155   int range;
 156
 157   for (range = 0; range < N_FPREGS_RANGES; range++)
 158     for (i = fpregs_ranges[range].regno_start; i <= fpregs_ranges[range].regno_end; i++)
 159       collect_register (i, ((char *) buf) + sparc_regmap[i]);
 160
 161 }
 162
 163 static void
 164 sparc_store_gregset_from_stack (const void *buf)
 165 {
 166   int i;
 167   CORE_ADDR addr = 0;
 168   unsigned char tmp_reg_buf[8];
 169   const int l0_regno = find_regno("l0");
 170   const int i7_regno = l0_regno + 15;
 171
 172   /* These registers have to be obtained from the stack.  */
 173   memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr));
 174
 175   addr += BIAS;
 176
 177   for (i = l0_regno; i <= i7_regno; i++)
 178     {
 179       (*the_target->read_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf));
 180       supply_register (i, tmp_reg_buf);
 181       addr += sizeof(tmp_reg_buf);
 182     }
 183 }
 184
 185 static void
 186 sparc_store_gregset (const void *buf)
 187 {
 188   int i;
 189   char zerobuf[8];
 190   int range;
 191
 192   memset (zerobuf, 0, sizeof(zerobuf));
 193
 194   for (range = 0; range < N_GREGS_RANGES; range++)
 195     for (i = gregs_ranges[range].regno_start; i <= gregs_ranges[range].regno_end; i++)
 196       if (sparc_regmap[i] != -1)
 197         supply_register (i, ((char *) buf) + sparc_regmap[i]);
 198       else
 199         supply_register (i, zerobuf);
 200
 201   sparc_store_gregset_from_stack (buf);
 202 }
 203
 204 static void
 205 sparc_store_fpregset (const void *buf)
 206 {
 207   int i;
 208   int range;
 209
 210   for (range = 0; range < N_FPREGS_RANGES; range++)
 211     for (i = fpregs_ranges[range].regno_start; i <= fpregs_ranges[range].regno_end; i++)
 212       supply_register (i, ((char *) buf) + sparc_regmap[i]);
 213 }
 214
 215 extern int debug_threads;
 216
 217 static CORE_ADDR
 218 sparc_get_pc ()
 219 {
 220   CORE_ADDR pc;
 221   collect_register_by_name ("pc", &pc);
 222   if (debug_threads)
 223     fprintf (stderr, "stop pc is %08lx\n", pc);
 224   return pc;
 225 }
 226
 227 static const unsigned char sparc_breakpoint[INSN_SIZE] = { 0x91, 0xd0, 0x20, 0x01 };
 228 #define sparc_breakpoint_len INSN_SIZE
 229
 230
 231 static int
 232 sparc_breakpoint_at (CORE_ADDR where)
 233 {
 234   unsigned char insn[INSN_SIZE];
 235
 236   (*the_target->read_memory) (where, (unsigned char *) insn, sizeof(insn));
 237
 238   if (memcmp(sparc_breakpoint, insn, sizeof(insn)) == 0)
 239     return 1;
 240
 241   /* If necessary, recognize more trap instructions here.  GDB only uses TRAP Always.  */
 242
 243   return 0;
 244 }
 245
 246 /* We only place breakpoints in empty marker functions, and thread locking
 247    is outside of the function.  So rather than importing software single-step,
 248    we can just run until exit.  */
 249 static CORE_ADDR
 250 sparc_reinsert_addr ()
 251 {
 252   CORE_ADDR lr;
 253   /* O7 is the equivalent to the 'lr' of other archs.  */
 254   collect_register_by_name ("o7", &lr);
 255   return lr;
 256 }
 257
 258
 259 struct regset_info target_regsets[] = {
 260   { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
 261     GENERAL_REGS,
 262     sparc_fill_gregset, sparc_store_gregset },
 263   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (fpregset_t),
 264     FP_REGS,
 265     sparc_fill_fpregset, sparc_store_fpregset },
 266   { 0, 0, -1, -1, NULL, NULL }
 267 };
 268
 269 struct linux_target_ops the_low_target = {
 270   init_registers_sparc64,
 271   sparc_num_regs,
 272   /* No regmap needs to be provided since this impl. doesn't use USRREGS.  */
 273   NULL,
 274   sparc_cannot_fetch_register,
 275   sparc_cannot_store_register,
 276   sparc_get_pc,
 277   /* No sparc_set_pc is needed.  */
 278   NULL,
 279   (const unsigned char *) sparc_breakpoint,
 280   sparc_breakpoint_len,
 281   sparc_reinsert_addr,
 282   0,
 283   sparc_breakpoint_at,
 284   NULL, NULL, NULL, NULL,
 285   NULL, NULL
 286 };