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, 2010, 2011 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 \
  44   (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
  45
  46 /* Each offset is multiplied by 8, because of the register size.
  47    These offsets apply to the buffer sent/filled by ptrace.
  48    Additionally, the array elements order corresponds to the .dat file, and the
  49    gdb's registers enumeration order.  */
  50
  51 static int sparc_regmap[] = {
  52   /* These offsets correspond to GET/SETREGSET.  */
  53         -1,  0*8,  1*8,  2*8,  3*8,  4*8,  5*8,  6*8,    /* g0 .. g7 */
  54         7*8,  8*8,  9*8, 10*8, 11*8, 12*8, 13*8, 14*8,   /* o0 .. o5, sp, o7 */
  55         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,    /* l0 .. l7 */
  56         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,    /* i0 .. i5, fp, i7 */
  57
  58   /* Floating point registers offsets correspond to GET/SETFPREGSET.  */
  59     0*4,  1*4,  2*4,  3*4,  4*4,  5*4,  6*4,  7*4,         /*  f0 ..  f7 */
  60     8*4,  9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4,         /*  f8 .. f15 */
  61    16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4,         /* f16 .. f23 */
  62    24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4,         /* f24 .. f31 */
  63
  64   /* F32 offset starts next to f31: 31*4+4 = 16 * 8.  */
  65    16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8,         /* f32 .. f46 */
  66    24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8,         /* f48 .. f62 */
  67
  68    17 *8, /*    pc */
  69    18 *8, /*   npc */
  70    16 *8, /* state */
  71   /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
  72      next to f62.  */
  73    32 *8, /*   fsr */
  74       -1, /*  fprs */
  75   /* Y register is 32-bits length, but gdb takes care of that.  */
  76    19 *8, /*     y */
  77
  78 };
  79
  80
  81 struct regs_range_t
  82 {
  83   int regno_start;
  84   int regno_end;
  85 };
  86
  87 static const struct regs_range_t gregs_ranges[] = {
  88  {  0, 31 }, /*   g0 .. i7  */
  89  { 80, 82 }, /*   pc .. state */
  90  { 84, 85 }  /* fprs .. y */
  91 };
  92
  93 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
  94
  95 static const struct regs_range_t fpregs_ranges[] = {
  96  { 32, 79 }, /* f0 .. f62  */
  97  { 83, 83 }  /* fsr */
  98 };
  99
 100 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
 101
 102 /* Defined in auto-generated file reg-sparc64.c.  */
 103 void init_registers_sparc64 (void);
 104
 105 static int
 106 sparc_cannot_store_register (int regno)
 107 {
 108   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
 109 }
 110
 111 static int
 112 sparc_cannot_fetch_register (int regno)
 113 {
 114   return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
 115 }
 116
 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("l0");
 124   const int i7_regno = l0_regno + 15;
 125
 126   /* These registers have to be stored in the stack.  */
 127   memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr));
 128
 129   addr += BIAS;
 130
 131   for (i = l0_regno; i <= i7_regno; i++)
 132     {
 133       collect_register (regcache, i, tmp_reg_buf);
 134       (*the_target->write_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf));
 135       addr += sizeof(tmp_reg_buf);
 136     }
 137 }
 138
 139 static void
 140 sparc_fill_gregset (struct regcache *regcache, void *buf)
 141 {
 142   int i;
 143   int range;
 144
 145   for (range = 0; range < N_GREGS_RANGES; range++)
 146     for (i = gregs_ranges[range].regno_start;
 147          i <= gregs_ranges[range].regno_end; i++)
 148       if (sparc_regmap[i] != -1)
 149         collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
 150
 151   sparc_fill_gregset_to_stack (regcache, buf);
 152 }
 153
 154 static void
 155 sparc_fill_fpregset (struct regcache *regcache, void *buf)
 156 {
 157   int i;
 158   int range;
 159
 160   for (range = 0; range < N_FPREGS_RANGES; range++)
 161     for (i = fpregs_ranges[range].regno_start;
 162          i <= fpregs_ranges[range].regno_end; i++)
 163       collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
 164
 165 }
 166
 167 static void
 168 sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
 169 {
 170   int i;
 171   CORE_ADDR addr = 0;
 172   unsigned char tmp_reg_buf[8];
 173   const int l0_regno = find_regno("l0");
 174   const int i7_regno = l0_regno + 15;
 175
 176   /* These registers have to be obtained from the stack.  */
 177   memcpy(&addr, ((char *) buf) + sparc_regmap[find_regno("sp")], sizeof(addr));
 178
 179   addr += BIAS;
 180
 181   for (i = l0_regno; i <= i7_regno; i++)
 182     {
 183       (*the_target->read_memory) (addr, tmp_reg_buf, sizeof(tmp_reg_buf));
 184       supply_register (regcache, i, tmp_reg_buf);
 185       addr += sizeof(tmp_reg_buf);
 186     }
 187 }
 188
 189 static void
 190 sparc_store_gregset (struct regcache *regcache, const void *buf)
 191 {
 192   int i;
 193   char zerobuf[8];
 194   int range;
 195
 196   memset (zerobuf, 0, sizeof(zerobuf));
 197
 198   for (range = 0; range < N_GREGS_RANGES; range++)
 199     for (i = gregs_ranges[range].regno_start;
 200          i <= gregs_ranges[range].regno_end; i++)
 201       if (sparc_regmap[i] != -1)
 202         supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
 203       else
 204         supply_register (regcache, i, zerobuf);
 205
 206   sparc_store_gregset_from_stack (regcache, buf);
 207 }
 208
 209 static void
 210 sparc_store_fpregset (struct regcache *regcache, const void *buf)
 211 {
 212   int i;
 213   int range;
 214
 215   for (range = 0; range < N_FPREGS_RANGES; range++)
 216     for (i = fpregs_ranges[range].regno_start;
 217          i <= fpregs_ranges[range].regno_end;
 218          i++)
 219       supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
 220 }
 221
 222 extern int debug_threads;
 223
 224 static CORE_ADDR
 225 sparc_get_pc (struct regcache *regcache)
 226 {
 227   unsigned long pc;
 228   collect_register_by_name (regcache, "pc", &pc);
 229   if (debug_threads)
 230     fprintf (stderr, "stop pc is %08lx\n", pc);
 231   return pc;
 232 }
 233
 234 static const unsigned char sparc_breakpoint[INSN_SIZE] = {
 235   0x91, 0xd0, 0x20, 0x01
 236 };
 237 #define sparc_breakpoint_len INSN_SIZE
 238
 239
 240 static int
 241 sparc_breakpoint_at (CORE_ADDR where)
 242 {
 243   unsigned char insn[INSN_SIZE];
 244
 245   (*the_target->read_memory) (where, (unsigned char *) insn, sizeof(insn));
 246
 247   if (memcmp(sparc_breakpoint, insn, sizeof(insn)) == 0)
 248     return 1;
 249
 250   /* If necessary, recognize more trap instructions here.  GDB only
 251      uses TRAP Always.  */
 252
 253   return 0;
 254 }
 255
 256 /* We only place breakpoints in empty marker functions, and thread locking
 257    is outside of the function.  So rather than importing software single-step,
 258    we can just run until exit.  */
 259 static CORE_ADDR
 260 sparc_reinsert_addr (void)
 261 {
 262   struct regcache *regcache = get_thread_regcache (current_inferior, 1);
 263   CORE_ADDR lr;
 264   /* O7 is the equivalent to the 'lr' of other archs.  */
 265   collect_register_by_name (regcache, "o7", &lr);
 266   return lr;
 267 }
 268
 269
 270 struct regset_info target_regsets[] = {
 271   { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
 272     GENERAL_REGS,
 273     sparc_fill_gregset, sparc_store_gregset },
 274   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
 275     FP_REGS,
 276     sparc_fill_fpregset, sparc_store_fpregset },
 277   { 0, 0, 0, -1, -1, NULL, NULL }
 278 };
 279
 280 struct linux_target_ops the_low_target = {
 281   init_registers_sparc64,
 282   sparc_num_regs,
 283   /* No regmap needs to be provided since this impl. doesn't use USRREGS.  */
 284   NULL,
 285   sparc_cannot_fetch_register,
 286   sparc_cannot_store_register,
 287   sparc_get_pc,
 288   /* No sparc_set_pc is needed.  */
 289   NULL,
 290   (const unsigned char *) sparc_breakpoint,
 291   sparc_breakpoint_len,
 292   sparc_reinsert_addr,
 293   0,
 294   sparc_breakpoint_at,
 295   NULL, NULL, NULL, NULL,
 296   NULL, NULL
 297 };