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 /* Used on amd64 only. Classify TYPE according to calling conventions,
86 and store the result in CLASS. */
87 void (*classify
) (struct type
*type
, enum amd64_reg_class
class[2]);
89 /* Used on amd64 only. Non-zero if the first few MEMORY arguments
90 should be passed by pointer.
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 /* Used on amd64 only.
100 If non-zero, then the callers of a function are expected to reserve
101 some space in the stack just before the area where the PC is saved
102 so that the callee may save the integer-parameter registers there.
103 The amount of space is dependent on the list of registers used for
104 integer parameter passing (see component call_dummy_num_integer_regs
106 int integer_param_regs_saved_in_caller_frame
;
108 /* Floating-point registers. */
109 struct regset
*fpregset
;
110 size_t sizeof_fpregset
;
112 /* Register number for %st(0). The register numbers for the other
113 registers follow from this one. Set this to -1 to indicate the
114 absence of an FPU. */
117 /* Number of MMX registers. */
120 /* Register number for %mm0. Set this to -1 to indicate the absence
124 /* Number of byte registers. */
127 /* Register pseudo number for %al. */
130 /* Number of pseudo word registers. */
133 /* Register number for %ax. */
136 /* Number of pseudo dword registers. */
139 /* Register number for %eax. Set this to -1 to indicate the absence
140 of pseudo dword register support. */
143 /* Number of core registers. */
146 /* Number of SSE registers. */
149 /* Register names. */
150 const char **register_names
;
152 /* Target description. */
153 const struct target_desc
*tdesc
;
155 /* Register group function. */
156 const void *register_reggroup_p
;
158 /* Offset of saved PC in jmp_buf. */
161 /* Convention for returning structures. */
162 enum struct_return struct_return
;
164 /* Address range where sigtramp lives. */
165 CORE_ADDR sigtramp_start
;
166 CORE_ADDR sigtramp_end
;
168 /* Detect sigtramp. */
169 int (*sigtramp_p
) (struct frame_info
*);
171 /* Get address of sigcontext for sigtramp. */
172 CORE_ADDR (*sigcontext_addr
) (struct frame_info
*);
174 /* Offset of registers in `struct sigcontext'. */
178 /* Offset of saved PC and SP in `struct sigcontext'. Usage of these
179 is deprecated, please use `sc_reg_offset' instead. */
183 /* ISA-specific data types. */
184 struct type
*i386_mmx_type
;
185 struct type
*i387_ext_type
;
187 /* Process record/replay target. */
188 /* The map for registers because the AMD64's registers order
189 in GDB is not same as I386 instructions. */
190 const int *record_regmap
;
191 /* Parse intx80 args. */
192 int (*i386_intx80_record
) (struct regcache
*regcache
);
193 /* Parse sysenter args. */
194 int (*i386_sysenter_record
) (struct regcache
*regcache
);
195 /* Parse syscall args. */
196 int (*i386_syscall_record
) (struct regcache
*regcache
);
199 /* Floating-point registers. */
201 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
202 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
205 /* Return non-zero if REGNUM matches the FP register and the FP
206 register set is active. */
207 extern int i386_fp_regnum_p (struct gdbarch
*, int);
208 extern int i386_fpc_regnum_p (struct gdbarch
*, int);
210 /* Register numbers of various important registers. */
214 I386_EAX_REGNUM
, /* %eax */
215 I386_ECX_REGNUM
, /* %ecx */
216 I386_EDX_REGNUM
, /* %edx */
217 I386_EBX_REGNUM
, /* %ebx */
218 I386_ESP_REGNUM
, /* %esp */
219 I386_EBP_REGNUM
, /* %ebp */
220 I386_ESI_REGNUM
, /* %esi */
221 I386_EDI_REGNUM
, /* %edi */
222 I386_EIP_REGNUM
, /* %eip */
223 I386_EFLAGS_REGNUM
, /* %eflags */
224 I386_CS_REGNUM
, /* %cs */
225 I386_SS_REGNUM
, /* %ss */
226 I386_DS_REGNUM
, /* %ds */
227 I386_ES_REGNUM
, /* %es */
228 I386_FS_REGNUM
, /* %fs */
229 I386_GS_REGNUM
, /* %gs */
230 I386_ST0_REGNUM
, /* %st(0) */
231 I386_MXCSR_REGNUM
= 40 /* %mxcsr */
234 /* Register numbers of RECORD_REGMAP. */
236 enum record_i386_regnum
238 X86_RECORD_REAX_REGNUM
,
239 X86_RECORD_RECX_REGNUM
,
240 X86_RECORD_REDX_REGNUM
,
241 X86_RECORD_REBX_REGNUM
,
242 X86_RECORD_RESP_REGNUM
,
243 X86_RECORD_REBP_REGNUM
,
244 X86_RECORD_RESI_REGNUM
,
245 X86_RECORD_REDI_REGNUM
,
246 X86_RECORD_R8_REGNUM
,
247 X86_RECORD_R9_REGNUM
,
248 X86_RECORD_R10_REGNUM
,
249 X86_RECORD_R11_REGNUM
,
250 X86_RECORD_R12_REGNUM
,
251 X86_RECORD_R13_REGNUM
,
252 X86_RECORD_R14_REGNUM
,
253 X86_RECORD_R15_REGNUM
,
254 X86_RECORD_REIP_REGNUM
,
255 X86_RECORD_EFLAGS_REGNUM
,
256 X86_RECORD_CS_REGNUM
,
257 X86_RECORD_SS_REGNUM
,
258 X86_RECORD_DS_REGNUM
,
259 X86_RECORD_ES_REGNUM
,
260 X86_RECORD_FS_REGNUM
,
261 X86_RECORD_GS_REGNUM
,
264 #define I386_NUM_GREGS 16
265 #define I386_NUM_XREGS 9
267 #define I386_SSE_NUM_REGS (I386_MXCSR_REGNUM + 1)
269 /* Size of the largest register. */
270 #define I386_MAX_REGISTER_SIZE 16
272 /* Types for i386-specific registers. */
273 extern struct type
*i387_ext_type (struct gdbarch
*gdbarch
);
275 /* Checks of different pseudo-registers. */
276 extern int i386_byte_regnum_p (struct gdbarch
*gdbarch
, int regnum
);
277 extern int i386_word_regnum_p (struct gdbarch
*gdbarch
, int regnum
);
278 extern int i386_dword_regnum_p (struct gdbarch
*gdbarch
, int regnum
);
280 extern const char *i386_pseudo_register_name (struct gdbarch
*gdbarch
,
283 extern void i386_pseudo_register_read (struct gdbarch
*gdbarch
,
284 struct regcache
*regcache
,
285 int regnum
, gdb_byte
*buf
);
286 extern void i386_pseudo_register_write (struct gdbarch
*gdbarch
,
287 struct regcache
*regcache
,
288 int regnum
, const gdb_byte
*buf
);
290 /* Segment selectors. */
291 #define I386_SEL_RPL 0x0003 /* Requester's Privilege Level mask. */
292 #define I386_SEL_UPL 0x0003 /* User Privilige Level. */
293 #define I386_SEL_KPL 0x0000 /* Kernel Privilige Level. */
295 /* The length of the longest i386 instruction (according to
296 include/asm-i386/kprobes.h in Linux 2.6. */
297 #define I386_MAX_INSN_LEN (16)
299 /* Functions exported from i386-tdep.c. */
300 extern CORE_ADDR
i386_pe_skip_trampoline_code (struct frame_info
*frame
,
301 CORE_ADDR pc
, char *name
);
302 extern CORE_ADDR
i386_skip_main_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
);
304 /* Return whether the THIS_FRAME corresponds to a sigtramp routine. */
305 extern int i386_sigtramp_p (struct frame_info
*this_frame
);
307 /* Return non-zero if REGNUM is a member of the specified group. */
308 extern int i386_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
309 struct reggroup
*group
);
311 /* Supply register REGNUM from the general-purpose register set REGSET
312 to register cache REGCACHE. If REGNUM is -1, do this for all
313 registers in REGSET. */
314 extern void i386_supply_gregset (const struct regset
*regset
,
315 struct regcache
*regcache
, int regnum
,
316 const void *gregs
, size_t len
);
318 /* Collect register REGNUM from the register cache REGCACHE and store
319 it in the buffer specified by GREGS and LEN as described by the
320 general-purpose register set REGSET. If REGNUM is -1, do this for
321 all registers in REGSET. */
322 extern void i386_collect_gregset (const struct regset
*regset
,
323 const struct regcache
*regcache
,
324 int regnum
, void *gregs
, size_t len
);
326 /* Return the appropriate register set for the core section identified
327 by SECT_NAME and SECT_SIZE. */
328 extern const struct regset
*
329 i386_regset_from_core_section (struct gdbarch
*gdbarch
,
330 const char *sect_name
, size_t sect_size
);
333 extern void i386_displaced_step_fixup (struct gdbarch
*gdbarch
,
334 struct displaced_step_closure
*closure
,
335 CORE_ADDR from
, CORE_ADDR to
,
336 struct regcache
*regs
);
338 /* Initialize a basic ELF architecture variant. */
339 extern void i386_elf_init_abi (struct gdbarch_info
, struct gdbarch
*);
341 /* Initialize a SVR4 architecture variant. */
342 extern void i386_svr4_init_abi (struct gdbarch_info
, struct gdbarch
*);
344 extern int i386_process_record (struct gdbarch
*gdbarch
,
345 struct regcache
*regcache
, CORE_ADDR addr
);
348 /* Functions and variables exported from i386bsd-tdep.c. */
350 extern void i386bsd_init_abi (struct gdbarch_info
, struct gdbarch
*);
351 extern CORE_ADDR i386fbsd_sigtramp_start_addr
;
352 extern CORE_ADDR i386fbsd_sigtramp_end_addr
;
353 extern CORE_ADDR i386obsd_sigtramp_start_addr
;
354 extern CORE_ADDR i386obsd_sigtramp_end_addr
;
355 extern int i386fbsd4_sc_reg_offset
[];
356 extern int i386fbsd_sc_reg_offset
[];
357 extern int i386nbsd_sc_reg_offset
[];
358 extern int i386obsd_sc_reg_offset
[];
359 extern int i386bsd_sc_reg_offset
[];
361 #endif /* i386-tdep.h */