gdb/gdbserver/lynx-i386-low.c

   1 /* Copyright (C) 2010-2012 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "lynx-low.h"
  20
  21 #include <stdint.h>
  22 #include <limits.h>
  23 #include <sys/ptrace.h>
  24
  25 /* The following two typedefs are defined in a .h file which is not
  26    in the standard include path (/sys/include/family/x86/ucontext.h),
  27    so we just duplicate them here.  */
  28
  29 /* General register context */
  30 typedef struct usr_econtext {
  31
  32     uint32_t    uec_fault;
  33     uint32_t    uec_es;
  34     uint32_t    uec_ds;
  35     uint32_t    uec_edi;
  36     uint32_t    uec_esi;
  37     uint32_t    uec_ebp;
  38     uint32_t    uec_temp;
  39     uint32_t    uec_ebx;
  40     uint32_t    uec_edx;
  41     uint32_t    uec_ecx;
  42     uint32_t    uec_eax;
  43     uint32_t    uec_inum;
  44     uint32_t    uec_ecode;
  45     uint32_t    uec_eip;
  46     uint32_t    uec_cs;
  47     uint32_t    uec_eflags;
  48     uint32_t    uec_esp;
  49     uint32_t    uec_ss;
  50     uint32_t    uec_fs;
  51     uint32_t    uec_gs;
  52 } usr_econtext_t;
  53
  54 /* Floating point and SIMD register context */
  55 typedef struct usr_fcontext {
  56         uint16_t         ufc_control;
  57         uint16_t         ufc_status;
  58         uint16_t         ufc_tag;
  59         uint16_t         ufc_opcode;
  60         uint8_t         *ufc_inst_off;
  61         uint32_t         ufc_inst_sel;
  62         uint8_t         *ufc_data_off;
  63         uint32_t         ufc_data_sel;
  64         uint32_t         usse_mxcsr;
  65         uint32_t         usse_mxcsr_mask;
  66         struct ufp387_real {
  67                 uint16_t umant4;
  68                 uint16_t umant3;
  69                 uint16_t umant2;
  70                 uint16_t umant1;
  71                 uint16_t us_and_e;
  72                 uint16_t ureserved_1;
  73                 uint16_t ureserved_2;
  74                 uint16_t ureserved_3;
  75         } ufc_reg[8];
  76         struct uxmm_register {
  77                 uint16_t uchunk_1;
  78                 uint16_t uchunk_2;
  79                 uint16_t uchunk_3;
  80                 uint16_t uchunk_4;
  81                 uint16_t uchunk_5;
  82                 uint16_t uchunk_6;
  83                 uint16_t uchunk_7;
  84                 uint16_t uchunk_8;
  85         } uxmm_reg[8];
  86         char ureserved[16][14];
  87 } usr_fcontext_t;
  88
  89 /* The index of various registers inside the regcache.  */
  90
  91 enum lynx_i386_gdb_regnum
  92 {
  93   I386_EAX_REGNUM,
  94   I386_ECX_REGNUM,
  95   I386_EDX_REGNUM,
  96   I386_EBX_REGNUM,
  97   I386_ESP_REGNUM,
  98   I386_EBP_REGNUM,
  99   I386_ESI_REGNUM,
 100   I386_EDI_REGNUM,
 101   I386_EIP_REGNUM,
 102   I386_EFLAGS_REGNUM,
 103   I386_CS_REGNUM,
 104   I386_SS_REGNUM,
 105   I386_DS_REGNUM,
 106   I386_ES_REGNUM,
 107   I386_FS_REGNUM,
 108   I386_GS_REGNUM,
 109   I386_ST0_REGNUM,
 110   I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8,
 111   I386_FSTAT_REGNUM,
 112   I386_FTAG_REGNUM,
 113   I386_FISEG_REGNUM,
 114   I386_FIOFF_REGNUM,
 115   I386_FOSEG_REGNUM,
 116   I386_FOOFF_REGNUM,
 117   I386_FOP_REGNUM,
 118   I386_XMM0_REGNUM = 32,
 119   I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8,
 120   I386_SENTINEL_REGUM
 121 };
 122
 123 /* Defined in auto-generated file i386.c.  */
 124 extern void init_registers_i386 (void);
 125
 126 /* The fill_function for the general-purpose register set.  */
 127
 128 static void
 129 lynx_i386_fill_gregset (struct regcache *regcache, char *buf)
 130 {
 131 #define lynx_i386_collect_gp(regnum, fld) \
 132   collect_register (regcache, regnum, \
 133                     buf + offsetof (usr_econtext_t, uec_##fld))
 134
 135   lynx_i386_collect_gp (I386_EAX_REGNUM, eax);
 136   lynx_i386_collect_gp (I386_ECX_REGNUM, ecx);
 137   lynx_i386_collect_gp (I386_EDX_REGNUM, edx);
 138   lynx_i386_collect_gp (I386_EBX_REGNUM, ebx);
 139   lynx_i386_collect_gp (I386_ESP_REGNUM, esp);
 140   lynx_i386_collect_gp (I386_EBP_REGNUM, ebp);
 141   lynx_i386_collect_gp (I386_ESI_REGNUM, esi);
 142   lynx_i386_collect_gp (I386_EDI_REGNUM, edi);
 143   lynx_i386_collect_gp (I386_EIP_REGNUM, eip);
 144   lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags);
 145   lynx_i386_collect_gp (I386_CS_REGNUM, cs);
 146   lynx_i386_collect_gp (I386_SS_REGNUM, ss);
 147   lynx_i386_collect_gp (I386_DS_REGNUM, ds);
 148   lynx_i386_collect_gp (I386_ES_REGNUM, es);
 149   lynx_i386_collect_gp (I386_FS_REGNUM, fs);
 150   lynx_i386_collect_gp (I386_GS_REGNUM, gs);
 151 }
 152
 153 /* The store_function for the general-purpose register set.  */
 154
 155 static void
 156 lynx_i386_store_gregset (struct regcache *regcache, const char *buf)
 157 {
 158 #define lynx_i386_supply_gp(regnum, fld) \
 159   supply_register (regcache, regnum, \
 160                    buf + offsetof (usr_econtext_t, uec_##fld))
 161
 162   lynx_i386_supply_gp (I386_EAX_REGNUM, eax);
 163   lynx_i386_supply_gp (I386_ECX_REGNUM, ecx);
 164   lynx_i386_supply_gp (I386_EDX_REGNUM, edx);
 165   lynx_i386_supply_gp (I386_EBX_REGNUM, ebx);
 166   lynx_i386_supply_gp (I386_ESP_REGNUM, esp);
 167   lynx_i386_supply_gp (I386_EBP_REGNUM, ebp);
 168   lynx_i386_supply_gp (I386_ESI_REGNUM, esi);
 169   lynx_i386_supply_gp (I386_EDI_REGNUM, edi);
 170   lynx_i386_supply_gp (I386_EIP_REGNUM, eip);
 171   lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags);
 172   lynx_i386_supply_gp (I386_CS_REGNUM, cs);
 173   lynx_i386_supply_gp (I386_SS_REGNUM, ss);
 174   lynx_i386_supply_gp (I386_DS_REGNUM, ds);
 175   lynx_i386_supply_gp (I386_ES_REGNUM, es);
 176   lynx_i386_supply_gp (I386_FS_REGNUM, fs);
 177   lynx_i386_supply_gp (I386_GS_REGNUM, gs);
 178 }
 179
 180 /* Extract the first 16 bits of register REGNUM in the REGCACHE,
 181    and store these 2 bytes at DEST.
 182
 183    This is useful to collect certain 16bit registers which are known
 184    by GDBserver as 32bit registers (such as the Control Register
 185    for instance).  */
 186
 187 static void
 188 collect_16bit_register (struct regcache *regcache, int regnum, char *dest)
 189 {
 190   gdb_byte word[4];
 191
 192   collect_register (regcache, regnum, word);
 193   memcpy (dest, word, 2);
 194 }
 195
 196 /* The fill_function for the floating-point register set.  */
 197
 198 static void
 199 lynx_i386_fill_fpregset (struct regcache *regcache, char *buf)
 200 {
 201   int i;
 202
 203   /* Collect %st0 .. %st7.  */
 204   for (i = 0; i < 8; i++)
 205     collect_register (regcache, I386_ST0_REGNUM + i,
 206                       buf + offsetof (usr_fcontext_t, ufc_reg)
 207                       + i * sizeof (struct ufp387_real));
 208
 209   /* Collect the other FPU registers.  */
 210   collect_16bit_register (regcache, I386_FCTRL_REGNUM,
 211                           buf + offsetof (usr_fcontext_t, ufc_control));
 212   collect_16bit_register (regcache, I386_FSTAT_REGNUM,
 213                           buf + offsetof (usr_fcontext_t, ufc_status));
 214   collect_16bit_register (regcache, I386_FTAG_REGNUM,
 215                           buf + offsetof (usr_fcontext_t, ufc_tag));
 216   collect_register (regcache, I386_FISEG_REGNUM,
 217                     buf + offsetof (usr_fcontext_t, ufc_inst_sel));
 218   collect_register (regcache, I386_FIOFF_REGNUM,
 219                     buf + offsetof (usr_fcontext_t, ufc_inst_off));
 220   collect_register (regcache, I386_FOSEG_REGNUM,
 221                     buf + offsetof (usr_fcontext_t, ufc_data_sel));
 222   collect_register (regcache, I386_FOOFF_REGNUM,
 223                     buf + offsetof (usr_fcontext_t, ufc_data_off));
 224   collect_16bit_register (regcache, I386_FOP_REGNUM,
 225                           buf + offsetof (usr_fcontext_t, ufc_opcode));
 226
 227   /* Collect the XMM registers.  */
 228   for (i = 0; i < 8; i++)
 229     collect_register (regcache, I386_XMM0_REGNUM + i,
 230                       buf + offsetof (usr_fcontext_t, uxmm_reg)
 231                       + i * sizeof (struct uxmm_register));
 232   collect_register (regcache, I386_MXCSR_REGNUM,
 233                     buf + offsetof (usr_fcontext_t, usse_mxcsr));
 234 }
 235
 236 /* This is the supply counterpart for collect_16bit_register:
 237    It extracts a 2byte value from BUF, and uses that value to
 238    set REGNUM's value in the regcache.
 239
 240    This is useful to supply the value of certain 16bit registers
 241    which are known by GDBserver as 32bit registers (such as the Control
 242    Register for instance).  */
 243
 244 static void
 245 supply_16bit_register (struct regcache *regcache, int regnum, const char *buf)
 246 {
 247   gdb_byte word[4];
 248
 249   memcpy (word, buf, 2);
 250   memset (word + 2, 0, 2);
 251   supply_register (regcache, regnum, word);
 252 }
 253
 254 /* The store_function for the floating-point register set.  */
 255
 256 static void
 257 lynx_i386_store_fpregset (struct regcache *regcache, const char *buf)
 258 {
 259   int i;
 260
 261   /* Store the %st0 .. %st7 registers.  */
 262   for (i = 0; i < 8; i++)
 263     supply_register (regcache, I386_ST0_REGNUM + i,
 264                      buf + offsetof (usr_fcontext_t, ufc_reg)
 265                      + i * sizeof (struct ufp387_real));
 266
 267   /* Store the other FPU registers.  */
 268   supply_16bit_register (regcache, I386_FCTRL_REGNUM,
 269                          buf + offsetof (usr_fcontext_t, ufc_control));
 270   supply_16bit_register (regcache, I386_FSTAT_REGNUM,
 271                          buf + offsetof (usr_fcontext_t, ufc_status));
 272   supply_16bit_register (regcache, I386_FTAG_REGNUM,
 273                          buf + offsetof (usr_fcontext_t, ufc_tag));
 274   supply_register (regcache, I386_FISEG_REGNUM,
 275                    buf + offsetof (usr_fcontext_t, ufc_inst_sel));
 276   supply_register (regcache, I386_FIOFF_REGNUM,
 277                    buf + offsetof (usr_fcontext_t, ufc_inst_off));
 278   supply_register (regcache, I386_FOSEG_REGNUM,
 279                    buf + offsetof (usr_fcontext_t, ufc_data_sel));
 280   supply_register (regcache, I386_FOOFF_REGNUM,
 281                    buf + offsetof (usr_fcontext_t, ufc_data_off));
 282   supply_16bit_register (regcache, I386_FOP_REGNUM,
 283                          buf + offsetof (usr_fcontext_t, ufc_opcode));
 284
 285   /* Store the XMM registers.  */
 286   for (i = 0; i < 8; i++)
 287     supply_register (regcache, I386_XMM0_REGNUM + i,
 288                      buf + offsetof (usr_fcontext_t, uxmm_reg)
 289                      + i * sizeof (struct uxmm_register));
 290   supply_register (regcache, I386_MXCSR_REGNUM,
 291                    buf + offsetof (usr_fcontext_t, usse_mxcsr));
 292 }
 293
 294 /* Implements the lynx_target_ops.arch_setup routine.  */
 295
 296 static void
 297 lynx_i386_arch_setup (void)
 298 {
 299   init_registers_i386 ();
 300 }
 301
 302 /* Description of all the x86-lynx register sets.  */
 303
 304 struct lynx_regset_info lynx_target_regsets[] = {
 305   /* General Purpose Registers.  */
 306   {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
 307    lynx_i386_fill_gregset, lynx_i386_store_gregset},
 308   /* Floating Point Registers.  */
 309   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
 310     lynx_i386_fill_fpregset, lynx_i386_store_fpregset },
 311   /* End of list marker.  */
 312   {0, 0, -1, NULL, NULL }
 313 };
 314
 315 /* The lynx_target_ops vector for x86-lynx.  */
 316
 317 struct lynx_target_ops the_low_target = {
 318   lynx_i386_arch_setup,
 319 };