gdb/gdbserver/linux-i386-ipa.c

   1 /* GNU/Linux/x86 specific low level interface, for the in-process
   2    agent library for GDB.
   3
   4    Copyright (C) 2010 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "server.h"
  22
  23 /* GDB register numbers.  */
  24
  25 enum i386_gdb_regnum
  26 {
  27   I386_EAX_REGNUM,              /* %eax */
  28   I386_ECX_REGNUM,              /* %ecx */
  29   I386_EDX_REGNUM,              /* %edx */
  30   I386_EBX_REGNUM,              /* %ebx */
  31   I386_ESP_REGNUM,              /* %esp */
  32   I386_EBP_REGNUM,              /* %ebp */
  33   I386_ESI_REGNUM,              /* %esi */
  34   I386_EDI_REGNUM,              /* %edi */
  35   I386_EIP_REGNUM,              /* %eip */
  36   I386_EFLAGS_REGNUM,           /* %eflags */
  37   I386_CS_REGNUM,               /* %cs */
  38   I386_SS_REGNUM,               /* %ss */
  39   I386_DS_REGNUM,               /* %ds */
  40   I386_ES_REGNUM,               /* %es */
  41   I386_FS_REGNUM,               /* %fs */
  42   I386_GS_REGNUM,               /* %gs */
  43   I386_ST0_REGNUM               /* %st(0) */
  44 };
  45
  46 #define i386_num_regs 16
  47
  48 /* Defined in auto-generated file i386-linux.c.  */
  49 void init_registers_i386_linux (void);
  50
  51 #define FT_CR_EAX 15
  52 #define FT_CR_ECX 14
  53 #define FT_CR_EDX 13
  54 #define FT_CR_EBX 12
  55 #define FT_CR_UESP 11
  56 #define FT_CR_EBP 10
  57 #define FT_CR_ESI 9
  58 #define FT_CR_EDI 8
  59 #define FT_CR_EIP 7
  60 #define FT_CR_EFL 6
  61 #define FT_CR_DS 5
  62 #define FT_CR_ES 4
  63 #define FT_CR_FS 3
  64 #define FT_CR_GS 2
  65 #define FT_CR_SS 1
  66 #define FT_CR_CS 0
  67
  68 /* Mapping between the general-purpose registers in jump tracepoint
  69    format and GDB's register array layout.  */
  70
  71 static const int i386_ft_collect_regmap[] =
  72 {
  73   FT_CR_EAX * 4, FT_CR_ECX * 4, FT_CR_EDX * 4, FT_CR_EBX * 4,
  74   FT_CR_UESP * 4, FT_CR_EBP * 4, FT_CR_ESI * 4, FT_CR_EDI * 4,
  75   FT_CR_EIP * 4, FT_CR_EFL * 4, FT_CR_CS * 4, FT_CR_SS * 4,
  76   FT_CR_DS * 4, FT_CR_ES * 4, FT_CR_FS * 4, FT_CR_GS * 4
  77 };
  78
  79 void
  80 supply_fast_tracepoint_registers (struct regcache *regcache,
  81                                   const unsigned char *buf)
  82 {
  83   int i;
  84
  85   for (i = 0; i < i386_num_regs; i++)
  86     {
  87       int regval;
  88
  89       if (i >= I386_CS_REGNUM && i <= I386_GS_REGNUM)
  90         regval = *(short *) (((char *) buf) + i386_ft_collect_regmap[i]);
  91       else
  92         regval = *(int *) (((char *) buf) + i386_ft_collect_regmap[i]);
  93
  94       supply_register (regcache, i, &regval);
  95     }
  96 }
  97
  98 ULONGEST __attribute__ ((visibility("default"), used))
  99 gdb_agent_get_raw_reg (unsigned char *raw_regs, int regnum)
 100 {
 101   /* This should maybe be allowed to return an error code, or perhaps
 102      better, have the emit_reg detect this, and emit a constant zero,
 103      or something.  */
 104
 105   if (regnum > i386_num_regs)
 106     return 0;
 107   else if (regnum >= I386_CS_REGNUM && regnum <= I386_GS_REGNUM)
 108     return *(short *) (raw_regs + i386_ft_collect_regmap[regnum]);
 109   else
 110     return *(int *) (raw_regs + i386_ft_collect_regmap[regnum]);
 111 }
 112
 113 #ifdef HAVE_UST
 114
 115 #include <ust/processor.h>
 116
 117 /* "struct registers" is the UST object type holding the registers at
 118    the time of the static tracepoint marker call.  This doesn't
 119    contain EIP, but we know what it must have been (the marker
 120    address).  */
 121
 122 #define ST_REGENTRY(REG)                        \
 123   {                                             \
 124     offsetof (struct registers, REG),           \
 125     sizeof (((struct registers *) NULL)->REG)   \
 126   }
 127
 128 static struct
 129 {
 130   int offset;
 131   int size;
 132 } i386_st_collect_regmap[] =
 133   {
 134     ST_REGENTRY(eax),
 135     ST_REGENTRY(ecx),
 136     ST_REGENTRY(edx),
 137     ST_REGENTRY(ebx),
 138     ST_REGENTRY(esp),
 139     ST_REGENTRY(ebp),
 140     ST_REGENTRY(esi),
 141     ST_REGENTRY(edi),
 142     { -1, 0 }, /* eip */
 143     ST_REGENTRY(eflags),
 144     ST_REGENTRY(cs),
 145     ST_REGENTRY(ss),
 146   };
 147
 148 #define i386_NUM_ST_COLLECT_GREGS \
 149   (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
 150
 151 void
 152 supply_static_tracepoint_registers (struct regcache *regcache,
 153                                     const unsigned char *buf,
 154                                     CORE_ADDR pc)
 155 {
 156   int i;
 157   unsigned int newpc = pc;
 158
 159   supply_register (regcache, I386_EIP_REGNUM, &newpc);
 160
 161   for (i = 0; i < i386_NUM_ST_COLLECT_GREGS; i++)
 162     if (i386_st_collect_regmap[i].offset != -1)
 163       {
 164         switch (i386_st_collect_regmap[i].size)
 165           {
 166           case 4:
 167             supply_register (regcache, i,
 168                              ((char *) buf)
 169                              + i386_st_collect_regmap[i].offset);
 170             break;
 171           case 2:
 172             {
 173               unsigned long reg
 174                 = * (short *) (((char *) buf)
 175                                + i386_st_collect_regmap[i].offset);
 176               reg &= 0xffff;
 177               supply_register (regcache, i, &reg);
 178             }
 179             break;
 180           default:
 181             internal_error ("unhandled register size: %d",
 182                             i386_st_collect_regmap[i].size);
 183           }
 184       }
 185 }
 186
 187 #endif /* HAVE_UST */
 188
 189
 190 /* This is only needed because reg-i386-linux-lib.o references it.  We
 191    may use it proper at some point.  */
 192 const char *gdbserver_xmltarget;
 193
 194 void
 195 initialize_low_tracepoint (void)
 196 {
 197   init_registers_i386_linux ();
 198 }