1 /* Target-dependent code for the i386.
3 Copyright (C) 2001-2019 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
32 /* GDB's i386 target supports both the 32-bit Intel Architecture
33 (IA-32) and the 64-bit AMD x86-64 architecture. Internally it uses
34 a similar register layout for both.
36 - General purpose registers
38 - FPU control registers
40 - SSE control register
42 The general purpose registers for the x86-64 architecture are quite
43 different from IA-32. Therefore, gdbarch_fp0_regnum
44 determines the register number at which the FPU data registers
45 start. The number of FPU data and control registers is the same
46 for both architectures. The number of SSE registers however,
47 differs and is determined by the num_xmm_regs member of `struct
50 /* Convention for returning structures. */
54 pcc_struct_return, /* Return "short" structures in memory. */
55 reg_struct_return /* Return "short" structures in registers. */
58 /* i386 architecture specific information. */
61 /* General-purpose registers. */
62 int *gregset_reg_offset;
64 size_t sizeof_gregset;
66 /* Floating-point registers. */
67 size_t sizeof_fpregset;
69 /* Register number for %st(0). The register numbers for the other
70 registers follow from this one. Set this to -1 to indicate the
74 /* Number of MMX registers. */
77 /* Register number for %mm0. Set this to -1 to indicate the absence
81 /* Number of pseudo YMM registers. */
84 /* Register number for %ymm0. Set this to -1 to indicate the absence
85 of pseudo YMM register support. */
88 /* Number of AVX512 OpMask registers (K-registers) */
91 /* Register number for %k0. Set this to -1 to indicate the absence
92 of AVX512 OpMask register support. */
95 /* Number of pseudo ZMM registers ($zmm0-$zmm31). */
98 /* Register number for %zmm0. Set this to -1 to indicate the absence
99 of pseudo ZMM register support. */
102 /* Number of byte registers. */
105 /* Register pseudo number for %al. */
108 /* Number of pseudo word registers. */
111 /* Register number for %ax. */
114 /* Number of pseudo dword registers. */
117 /* Register number for %eax. Set this to -1 to indicate the absence
118 of pseudo dword register support. */
121 /* Number of core registers. */
124 /* Number of SSE registers. */
127 /* Number of SSE registers added in AVX512. */
128 int num_xmm_avx512_regs;
130 /* Register number of XMM16, the first XMM register added in AVX512. */
133 /* Number of YMM registers added in AVX512. */
134 int num_ymm_avx512_regs;
136 /* Register number of YMM16, the first YMM register added in AVX512. */
139 /* Bits of the extended control register 0 (the XFEATURE_ENABLED_MASK
140 register), excluding the x87 bit, which are supported by this GDB. */
144 /* Offset of XCR0 in XSAVE extended state. */
145 int xsave_xcr0_offset;
147 /* Register names. */
148 const char **register_names;
150 /* Register number for %ymm0h. Set this to -1 to indicate the absence
151 of upper YMM register support. */
154 /* Upper YMM register names. Only used for tdesc_numbered_register. */
155 const char **ymmh_register_names;
157 /* Register number for %ymm16h. Set this to -1 to indicate the absence
158 of support for YMM16-31. */
161 /* YMM16-31 register names. Only used for tdesc_numbered_register. */
162 const char **ymm16h_register_names;
164 /* Register number for %bnd0r. Set this to -1 to indicate the absence
168 /* Register number for pseudo register %bnd0. Set this to -1 to indicate the absence
172 /* Register number for %bndcfgu. Set this to -1 to indicate the absence
173 bound control registers. */
176 /* MPX register names. Only used for tdesc_numbered_register. */
177 const char **mpx_register_names;
179 /* Register number for %zmm0h. Set this to -1 to indicate the absence
180 of ZMM_HI256 register support. */
183 /* OpMask register names. */
184 const char **k_register_names;
186 /* ZMM register names. Only used for tdesc_numbered_register. */
187 const char **zmmh_register_names;
189 /* XMM16-31 register names. Only used for tdesc_numbered_register. */
190 const char **xmm_avx512_register_names;
192 /* YMM16-31 register names. Only used for tdesc_numbered_register. */
193 const char **ymm_avx512_register_names;
195 /* Number of PKEYS registers. */
198 /* Register number for PKRU register. */
201 /* PKEYS register names. */
202 const char **pkeys_register_names;
204 /* Register number for %fsbase. Set this to -1 to indicate the
205 absence of segment base registers. */
208 /* Target description. */
209 const struct target_desc *tdesc;
211 /* Register group function. */
212 gdbarch_register_reggroup_p_ftype *register_reggroup_p;
214 /* Offset of saved PC in jmp_buf. */
217 /* Convention for returning structures. */
218 enum struct_return struct_return;
220 /* Address range where sigtramp lives. */
221 CORE_ADDR sigtramp_start;
222 CORE_ADDR sigtramp_end;
224 /* Detect sigtramp. */
225 int (*sigtramp_p) (struct frame_info *);
227 /* Get address of sigcontext for sigtramp. */
228 CORE_ADDR (*sigcontext_addr) (struct frame_info *);
230 /* Offset of registers in `struct sigcontext'. */
234 /* Offset of saved PC and SP in `struct sigcontext'. Usage of these
235 is deprecated, please use `sc_reg_offset' instead. */
239 /* ISA-specific data types. */
240 struct type *i386_mmx_type;
241 struct type *i386_ymm_type;
242 struct type *i386_zmm_type;
243 struct type *i387_ext_type;
244 struct type *i386_bnd_type;
246 /* Process record/replay target. */
247 /* The map for registers because the AMD64's registers order
248 in GDB is not same as I386 instructions. */
249 const int *record_regmap;
250 /* Parse intx80 args. */
251 int (*i386_intx80_record) (struct regcache *regcache);
252 /* Parse sysenter args. */
253 int (*i386_sysenter_record) (struct regcache *regcache);
254 /* Parse syscall args. */
255 int (*i386_syscall_record) (struct regcache *regcache);
258 const struct regset *fpregset;
261 /* Floating-point registers. */
263 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
264 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
267 /* Return non-zero if REGNUM matches the FP register and the FP
268 register set is active. */
269 extern int i386_fp_regnum_p (struct gdbarch *, int);
270 extern int i386_fpc_regnum_p (struct gdbarch *, int);
272 /* Register numbers of various important registers. */
276 I386_EAX_REGNUM, /* %eax */
277 I386_ECX_REGNUM, /* %ecx */
278 I386_EDX_REGNUM, /* %edx */
279 I386_EBX_REGNUM, /* %ebx */
280 I386_ESP_REGNUM, /* %esp */
281 I386_EBP_REGNUM, /* %ebp */
282 I386_ESI_REGNUM, /* %esi */
283 I386_EDI_REGNUM, /* %edi */
284 I386_EIP_REGNUM, /* %eip */
285 I386_EFLAGS_REGNUM, /* %eflags */
286 I386_CS_REGNUM, /* %cs */
287 I386_SS_REGNUM, /* %ss */
288 I386_DS_REGNUM, /* %ds */
289 I386_ES_REGNUM, /* %es */
290 I386_FS_REGNUM, /* %fs */
291 I386_GS_REGNUM, /* %gs */
292 I386_ST0_REGNUM, /* %st(0) */
293 I386_MXCSR_REGNUM = 40, /* %mxcsr */
294 I386_YMM0H_REGNUM, /* %ymm0h */
295 I386_YMM7H_REGNUM = I386_YMM0H_REGNUM + 7,
297 I386_BND3R_REGNUM = I386_BND0R_REGNUM + 3,
299 I386_BNDSTATUS_REGNUM,
300 I386_K0_REGNUM, /* %k0 */
301 I386_K7_REGNUM = I386_K0_REGNUM + 7,
302 I386_ZMM0H_REGNUM, /* %zmm0h */
303 I386_ZMM7H_REGNUM = I386_ZMM0H_REGNUM + 7,
309 /* Register numbers of RECORD_REGMAP. */
311 enum record_i386_regnum
313 X86_RECORD_REAX_REGNUM,
314 X86_RECORD_RECX_REGNUM,
315 X86_RECORD_REDX_REGNUM,
316 X86_RECORD_REBX_REGNUM,
317 X86_RECORD_RESP_REGNUM,
318 X86_RECORD_REBP_REGNUM,
319 X86_RECORD_RESI_REGNUM,
320 X86_RECORD_REDI_REGNUM,
321 X86_RECORD_R8_REGNUM,
322 X86_RECORD_R9_REGNUM,
323 X86_RECORD_R10_REGNUM,
324 X86_RECORD_R11_REGNUM,
325 X86_RECORD_R12_REGNUM,
326 X86_RECORD_R13_REGNUM,
327 X86_RECORD_R14_REGNUM,
328 X86_RECORD_R15_REGNUM,
329 X86_RECORD_REIP_REGNUM,
330 X86_RECORD_EFLAGS_REGNUM,
331 X86_RECORD_CS_REGNUM,
332 X86_RECORD_SS_REGNUM,
333 X86_RECORD_DS_REGNUM,
334 X86_RECORD_ES_REGNUM,
335 X86_RECORD_FS_REGNUM,
336 X86_RECORD_GS_REGNUM,
339 #define I386_NUM_GREGS 16
340 #define I386_NUM_XREGS 9
342 #define I386_SSE_NUM_REGS (I386_MXCSR_REGNUM + 1)
343 #define I386_AVX_NUM_REGS (I386_YMM7H_REGNUM + 1)
344 #define I386_MPX_NUM_REGS (I386_BNDSTATUS_REGNUM + 1)
345 #define I386_AVX512_NUM_REGS (I386_ZMM7H_REGNUM + 1)
346 #define I386_PKEYS_NUM_REGS (I386_PKRU_REGNUM + 1)
347 #define I386_NUM_REGS (I386_GSBASE_REGNUM + 1)
349 /* Size of the largest register. */
350 #define I386_MAX_REGISTER_SIZE 64
352 /* Types for i386-specific registers. */
353 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
355 /* Checks of different pseudo-registers. */
356 extern int i386_byte_regnum_p (struct gdbarch *gdbarch, int regnum);
357 extern int i386_word_regnum_p (struct gdbarch *gdbarch, int regnum);
358 extern int i386_dword_regnum_p (struct gdbarch *gdbarch, int regnum);
359 extern int i386_xmm_regnum_p (struct gdbarch *gdbarch, int regnum);
360 extern int i386_xmm_avx512_regnum_p (struct gdbarch * gdbarch, int regnum);
361 extern int i386_ymm_regnum_p (struct gdbarch *gdbarch, int regnum);
362 extern int i386_ymm_avx512_regnum_p (struct gdbarch *gdbarch, int regnum);
363 extern int i386_bnd_regnum_p (struct gdbarch *gdbarch, int regnum);
364 extern int i386_k_regnum_p (struct gdbarch *gdbarch, int regnum);
365 extern int i386_zmm_regnum_p (struct gdbarch *gdbarch, int regnum);
366 extern int i386_zmmh_regnum_p (struct gdbarch *gdbarch, int regnum);
367 extern bool i386_pkru_regnum_p (struct gdbarch *gdbarch, int regnum);
369 extern const char *i386_pseudo_register_name (struct gdbarch *gdbarch,
371 extern struct type *i386_pseudo_register_type (struct gdbarch *gdbarch,
374 extern void i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
375 readable_regcache *regcache,
377 struct value *result);
379 extern void i386_pseudo_register_write (struct gdbarch *gdbarch,
380 struct regcache *regcache,
381 int regnum, const gdb_byte *buf);
383 extern int i386_ax_pseudo_register_collect (struct gdbarch *gdbarch,
384 struct agent_expr *ax,
387 /* Segment selectors. */
388 #define I386_SEL_RPL 0x0003 /* Requester's Privilege Level mask. */
389 #define I386_SEL_UPL 0x0003 /* User Privilige Level. */
390 #define I386_SEL_KPL 0x0000 /* Kernel Privilige Level. */
392 /* The length of the longest i386 instruction (according to
393 include/asm-i386/kprobes.h in Linux 2.6. */
394 #define I386_MAX_INSN_LEN (16)
396 /* Functions exported from i386-tdep.c. */
397 extern CORE_ADDR i386_pe_skip_trampoline_code (struct frame_info *frame,
398 CORE_ADDR pc, char *name);
399 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch,
402 /* Return whether the THIS_FRAME corresponds to a sigtramp routine. */
403 extern int i386_sigtramp_p (struct frame_info *this_frame);
405 /* Return non-zero if REGNUM is a member of the specified group. */
406 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
407 struct reggroup *group);
409 /* Supply register REGNUM from the general-purpose register set REGSET
410 to register cache REGCACHE. If REGNUM is -1, do this for all
411 registers in REGSET. */
412 extern void i386_supply_gregset (const struct regset *regset,
413 struct regcache *regcache, int regnum,
414 const void *gregs, size_t len);
416 /* General-purpose register set. */
417 extern const struct regset i386_gregset;
419 /* Floating-point register set. */
420 extern const struct regset i386_fpregset;
422 /* Default iterator over core file register note sections. */
424 i386_iterate_over_regset_sections (struct gdbarch *gdbarch,
425 iterate_over_regset_sections_cb *cb,
427 const struct regcache *regcache);
429 typedef buf_displaced_step_closure i386_displaced_step_closure;
431 extern struct displaced_step_closure *i386_displaced_step_copy_insn
432 (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
433 struct regcache *regs);
434 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
435 struct displaced_step_closure *closure,
436 CORE_ADDR from, CORE_ADDR to,
437 struct regcache *regs);
439 /* Initialize a basic ELF architecture variant. */
440 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
442 /* Initialize a SVR4 architecture variant. */
443 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
445 /* Convert SVR4 register number REG to the appropriate register number
447 extern int i386_svr4_reg_to_regnum (struct gdbarch *gdbarch, int reg);
449 extern int i386_process_record (struct gdbarch *gdbarch,
450 struct regcache *regcache, CORE_ADDR addr);
451 extern const struct target_desc *i386_target_description (uint64_t xcr0,
454 /* Return true iff the current target is MPX enabled. */
455 extern int i386_mpx_enabled (void);
458 /* Functions and variables exported from i386-bsd-tdep.c. */
460 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
461 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
462 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
463 extern CORE_ADDR i386obsd_sigtramp_start_addr;
464 extern CORE_ADDR i386obsd_sigtramp_end_addr;
465 extern int i386fbsd4_sc_reg_offset[];
466 extern int i386fbsd_sc_reg_offset[];
467 extern int i386nbsd_sc_reg_offset[];
468 extern int i386obsd_sc_reg_offset[];
469 extern int i386bsd_sc_reg_offset[];
471 /* SystemTap related functions. */
473 extern int i386_stap_is_single_operand (struct gdbarch *gdbarch,
476 extern int i386_stap_parse_special_token (struct gdbarch *gdbarch,
477 struct stap_parse_info *p);
479 #endif /* i386-tdep.h */