1 /* Target-dependent code for the i386.
3 Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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.
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.
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/>. */
30 /* GDB's i386 target supports both the 32-bit Intel Architecture
31 (IA-32) and the 64-bit AMD x86-64 architecture. Internally it uses
32 a similar register layout for both.
34 - General purpose registers
36 - FPU control registers
38 - SSE control register
40 The general purpose registers for the x86-64 architecture are quite
41 different from IA-32. Therefore, gdbarch_fp0_regnum
42 determines the register number at which the FPU data registers
43 start. The number of FPU data and control registers is the same
44 for both architectures. The number of SSE registers however,
45 differs and is determined by the num_xmm_regs member of `struct
48 /* Convention for returning structures. */
52 pcc_struct_return, /* Return "short" structures in memory. */
53 reg_struct_return /* Return "short" structures in registers. */
56 /* Register classes as defined in the AMD x86-64 psABI. */
70 /* i386 architecture specific information. */
73 /* General-purpose registers. */
74 struct regset *gregset;
75 int *gregset_reg_offset;
77 size_t sizeof_gregset;
79 /* The general-purpose registers used to pass integers when making
80 function calls. This only applies to amd64, as all parameters
81 are passed through the stack on x86. */
82 int call_dummy_num_integer_regs;
83 int *call_dummy_integer_regs;
85 /* Classify TYPE according to calling conventions, and store
86 the result in CLASS. Used on amd64 only. */
87 void (*classify) (struct type *type, enum amd64_reg_class class[2]);
89 /* Non-zero if the first few MEMORY arguments should be passed by
92 More precisely, MEMORY arguments are passed through the stack.
93 But certain architectures require that their address be passed
94 by register as well, if there are still some integer registers
95 available for argument passing. */
96 int memory_args_by_pointer;
98 /* Floating-point registers. */
99 struct regset *fpregset;
100 size_t sizeof_fpregset;
102 /* Register number for %st(0). The register numbers for the other
103 registers follow from this one. Set this to -1 to indicate the
104 absence of an FPU. */
107 /* Register number for %mm0. Set this to -1 to indicate the absence
111 /* Number of SSE registers. */
114 /* Offset of saved PC in jmp_buf. */
117 /* Convention for returning structures. */
118 enum struct_return struct_return;
120 /* Address range where sigtramp lives. */
121 CORE_ADDR sigtramp_start;
122 CORE_ADDR sigtramp_end;
124 /* Detect sigtramp. */
125 int (*sigtramp_p) (struct frame_info *);
127 /* Get address of sigcontext for sigtramp. */
128 CORE_ADDR (*sigcontext_addr) (struct frame_info *);
130 /* Offset of registers in `struct sigcontext'. */
134 /* Offset of saved PC and SP in `struct sigcontext'. Usage of these
135 is deprecated, please use `sc_reg_offset' instead. */
139 /* ISA-specific data types. */
140 struct type *i386_eflags_type;
141 struct type *i386_mxcsr_type;
142 struct type *i386_mmx_type;
143 struct type *i386_sse_type;
144 struct type *i387_ext_type;
146 /* Process record/replay target. */
147 /* The map for registers because the AMD64's registers order
148 in GDB is not same as I386 instructions. */
149 const int *record_regmap;
150 /* Parse intx80 args. */
151 int (*i386_intx80_record) (struct regcache *regcache);
152 /* Parse sysenter args. */
153 int (*i386_sysenter_record) (struct regcache *regcache);
154 /* Parse syscall args. */
155 int (*i386_syscall_record) (struct regcache *regcache);
158 /* Floating-point registers. */
160 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
161 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
164 /* Return non-zero if REGNUM matches the FP register and the FP
165 register set is active. */
166 extern int i386_fp_regnum_p (struct gdbarch *, int);
167 extern int i386_fpc_regnum_p (struct gdbarch *, int);
169 /* Register numbers of various important registers. */
173 I386_EAX_REGNUM, /* %eax */
174 I386_ECX_REGNUM, /* %ecx */
175 I386_EDX_REGNUM, /* %edx */
176 I386_EBX_REGNUM, /* %ebx */
177 I386_ESP_REGNUM, /* %esp */
178 I386_EBP_REGNUM, /* %ebp */
179 I386_ESI_REGNUM, /* %esi */
180 I386_EDI_REGNUM, /* %edi */
181 I386_EIP_REGNUM, /* %eip */
182 I386_EFLAGS_REGNUM, /* %eflags */
183 I386_CS_REGNUM, /* %cs */
184 I386_SS_REGNUM, /* %ss */
185 I386_DS_REGNUM, /* %ds */
186 I386_ES_REGNUM, /* %es */
187 I386_FS_REGNUM, /* %fs */
188 I386_GS_REGNUM, /* %gs */
189 I386_ST0_REGNUM /* %st(0) */
192 /* Register numbers of RECORD_REGMAP. */
194 enum record_i386_regnum
196 X86_RECORD_REAX_REGNUM,
197 X86_RECORD_RECX_REGNUM,
198 X86_RECORD_REDX_REGNUM,
199 X86_RECORD_REBX_REGNUM,
200 X86_RECORD_RESP_REGNUM,
201 X86_RECORD_REBP_REGNUM,
202 X86_RECORD_RESI_REGNUM,
203 X86_RECORD_REDI_REGNUM,
204 X86_RECORD_R8_REGNUM,
205 X86_RECORD_R9_REGNUM,
206 X86_RECORD_R10_REGNUM,
207 X86_RECORD_R11_REGNUM,
208 X86_RECORD_R12_REGNUM,
209 X86_RECORD_R13_REGNUM,
210 X86_RECORD_R14_REGNUM,
211 X86_RECORD_R15_REGNUM,
212 X86_RECORD_REIP_REGNUM,
213 X86_RECORD_EFLAGS_REGNUM,
214 X86_RECORD_CS_REGNUM,
215 X86_RECORD_SS_REGNUM,
216 X86_RECORD_DS_REGNUM,
217 X86_RECORD_ES_REGNUM,
218 X86_RECORD_FS_REGNUM,
219 X86_RECORD_GS_REGNUM,
222 #define I386_NUM_GREGS 16
223 #define I386_NUM_FREGS 16
224 #define I386_NUM_XREGS 9
226 #define I386_SSE_NUM_REGS (I386_NUM_GREGS + I386_NUM_FREGS \
229 /* Size of the largest register. */
230 #define I386_MAX_REGISTER_SIZE 16
232 /* Types for i386-specific registers. */
233 extern struct type *i386_eflags_type (struct gdbarch *gdbarch);
234 extern struct type *i386_mxcsr_type (struct gdbarch *gdbarch);
235 extern struct type *i386_mmx_type (struct gdbarch *gdbarch);
236 extern struct type *i386_sse_type (struct gdbarch *gdbarch);
237 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
239 /* Segment selectors. */
240 #define I386_SEL_RPL 0x0003 /* Requester's Privilege Level mask. */
241 #define I386_SEL_UPL 0x0003 /* User Privilige Level. */
242 #define I386_SEL_KPL 0x0000 /* Kernel Privilige Level. */
244 /* The length of the longest i386 instruction (according to
245 include/asm-i386/kprobes.h in Linux 2.6. */
246 #define I386_MAX_INSN_LEN (16)
248 /* Functions exported from i386-tdep.c. */
249 extern CORE_ADDR i386_pe_skip_trampoline_code (struct frame_info *frame,
250 CORE_ADDR pc, char *name);
251 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc);
253 /* Return whether the THIS_FRAME corresponds to a sigtramp routine. */
254 extern int i386_sigtramp_p (struct frame_info *this_frame);
256 /* Return the name of register REGNUM. */
257 extern char const *i386_register_name (struct gdbarch * gdbarch, int regnum);
259 /* Return non-zero if REGNUM is a member of the specified group. */
260 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
261 struct reggroup *group);
263 /* Supply register REGNUM from the general-purpose register set REGSET
264 to register cache REGCACHE. If REGNUM is -1, do this for all
265 registers in REGSET. */
266 extern void i386_supply_gregset (const struct regset *regset,
267 struct regcache *regcache, int regnum,
268 const void *gregs, size_t len);
270 /* Collect register REGNUM from the register cache REGCACHE and store
271 it in the buffer specified by GREGS and LEN as described by the
272 general-purpose register set REGSET. If REGNUM is -1, do this for
273 all registers in REGSET. */
274 extern void i386_collect_gregset (const struct regset *regset,
275 const struct regcache *regcache,
276 int regnum, void *gregs, size_t len);
278 /* Return the appropriate register set for the core section identified
279 by SECT_NAME and SECT_SIZE. */
280 extern const struct regset *
281 i386_regset_from_core_section (struct gdbarch *gdbarch,
282 const char *sect_name, size_t sect_size);
285 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
286 struct displaced_step_closure *closure,
287 CORE_ADDR from, CORE_ADDR to,
288 struct regcache *regs);
290 /* Initialize a basic ELF architecture variant. */
291 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
293 /* Initialize a SVR4 architecture variant. */
294 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
296 extern int i386_process_record (struct gdbarch *gdbarch,
297 struct regcache *regcache, CORE_ADDR addr);
300 /* Functions and variables exported from i386bsd-tdep.c. */
302 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
303 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
304 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
305 extern CORE_ADDR i386obsd_sigtramp_start_addr;
306 extern CORE_ADDR i386obsd_sigtramp_end_addr;
307 extern int i386fbsd4_sc_reg_offset[];
308 extern int i386fbsd_sc_reg_offset[];
309 extern int i386nbsd_sc_reg_offset[];
310 extern int i386obsd_sc_reg_offset[];
311 extern int i386bsd_sc_reg_offset[];
313 #endif /* i386-tdep.h */