1 /* Target-dependent code for the i386.
3 Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009
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 /* i386 architecture specific information. */
59 /* General-purpose registers. */
60 struct regset *gregset;
61 int *gregset_reg_offset;
63 size_t sizeof_gregset;
65 /* Floating-point registers. */
66 struct regset *fpregset;
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 /* Register number for %mm0. Set this to -1 to indicate the absence
78 /* Number of SSE registers. */
81 /* Offset of saved PC in jmp_buf. */
84 /* Convention for returning structures. */
85 enum struct_return struct_return;
87 /* Address range where sigtramp lives. */
88 CORE_ADDR sigtramp_start;
89 CORE_ADDR sigtramp_end;
91 /* Detect sigtramp. */
92 int (*sigtramp_p) (struct frame_info *);
94 /* Get address of sigcontext for sigtramp. */
95 CORE_ADDR (*sigcontext_addr) (struct frame_info *);
97 /* Offset of registers in `struct sigcontext'. */
101 /* Offset of saved PC and SP in `struct sigcontext'. Usage of these
102 is deprecated, please use `sc_reg_offset' instead. */
106 /* ISA-specific data types. */
107 struct type *i386_mmx_type;
108 struct type *i386_sse_type;
109 struct type *i387_ext_type;
111 /* Process record/replay target. */
112 /* Parse intx80 args. */
113 int (*i386_intx80_record) (struct regcache *regcache);
114 /* Parse sysenter args. */
115 int (*i386_sysenter_record) (struct regcache *regcache);
118 /* Floating-point registers. */
120 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
121 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
124 /* Return non-zero if REGNUM matches the FP register and the FP
125 register set is active. */
126 extern int i386_fp_regnum_p (struct gdbarch *, int);
127 extern int i386_fpc_regnum_p (struct gdbarch *, int);
129 /* Register numbers of various important registers. */
133 I386_EAX_REGNUM, /* %eax */
134 I386_ECX_REGNUM, /* %ecx */
135 I386_EDX_REGNUM, /* %edx */
136 I386_EBX_REGNUM, /* %ebx */
137 I386_ESP_REGNUM, /* %esp */
138 I386_EBP_REGNUM, /* %ebp */
139 I386_ESI_REGNUM, /* %esi */
140 I386_EDI_REGNUM, /* %edi */
141 I386_EIP_REGNUM, /* %eip */
142 I386_EFLAGS_REGNUM, /* %eflags */
143 I386_CS_REGNUM, /* %cs */
144 I386_SS_REGNUM, /* %ss */
145 I386_DS_REGNUM, /* %ds */
146 I386_ES_REGNUM, /* %es */
147 I386_FS_REGNUM, /* %fs */
148 I386_GS_REGNUM, /* %gs */
149 I386_ST0_REGNUM /* %st(0) */
152 #define I386_NUM_GREGS 16
153 #define I386_NUM_FREGS 16
154 #define I386_NUM_XREGS 9
156 #define I386_SSE_NUM_REGS (I386_NUM_GREGS + I386_NUM_FREGS \
159 /* Size of the largest register. */
160 #define I386_MAX_REGISTER_SIZE 16
162 /* Types for i386-specific registers. */
163 extern struct type *i386_eflags_type;
164 extern struct type *i386_mxcsr_type;
166 extern struct type *i386_mmx_type (struct gdbarch *gdbarch);
167 extern struct type *i386_sse_type (struct gdbarch *gdbarch);
168 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
170 /* Segment selectors. */
171 #define I386_SEL_RPL 0x0003 /* Requester's Privilege Level mask. */
172 #define I386_SEL_UPL 0x0003 /* User Privilige Level. */
173 #define I386_SEL_KPL 0x0000 /* Kernel Privilige Level. */
175 /* The length of the longest i386 instruction (according to
176 include/asm-i386/kprobes.h in Linux 2.6. */
177 #define I386_MAX_INSN_LEN (16)
179 /* Functions exported from i386-tdep.c. */
180 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
181 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc);
183 /* Return whether the THIS_FRAME corresponds to a sigtramp routine. */
184 extern int i386_sigtramp_p (struct frame_info *this_frame);
186 /* Return the name of register REGNUM. */
187 extern char const *i386_register_name (struct gdbarch * gdbarch, int regnum);
189 /* Return non-zero if REGNUM is a member of the specified group. */
190 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
191 struct reggroup *group);
193 /* Supply register REGNUM from the general-purpose register set REGSET
194 to register cache REGCACHE. If REGNUM is -1, do this for all
195 registers in REGSET. */
196 extern void i386_supply_gregset (const struct regset *regset,
197 struct regcache *regcache, int regnum,
198 const void *gregs, size_t len);
200 /* Collect register REGNUM from the register cache REGCACHE and store
201 it in the buffer specified by GREGS and LEN as described by the
202 general-purpose register set REGSET. If REGNUM is -1, do this for
203 all registers in REGSET. */
204 extern void i386_collect_gregset (const struct regset *regset,
205 const struct regcache *regcache,
206 int regnum, void *gregs, size_t len);
208 /* Return the appropriate register set for the core section identified
209 by SECT_NAME and SECT_SIZE. */
210 extern const struct regset *
211 i386_regset_from_core_section (struct gdbarch *gdbarch,
212 const char *sect_name, size_t sect_size);
215 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
216 struct displaced_step_closure *closure,
217 CORE_ADDR from, CORE_ADDR to,
218 struct regcache *regs);
220 /* Initialize a basic ELF architecture variant. */
221 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
223 /* Initialize a SVR4 architecture variant. */
224 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
226 extern int i386_process_record (struct gdbarch *gdbarch,
227 struct regcache *regcache, CORE_ADDR addr);
230 /* Functions and variables exported from i386bsd-tdep.c. */
232 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
233 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
234 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
235 extern CORE_ADDR i386obsd_sigtramp_start_addr;
236 extern CORE_ADDR i386obsd_sigtramp_end_addr;
237 extern int i386fbsd4_sc_reg_offset[];
238 extern int i386fbsd_sc_reg_offset[];
239 extern int i386nbsd_sc_reg_offset[];
240 extern int i386obsd_sc_reg_offset[];
241 extern int i386bsd_sc_reg_offset[];
243 #endif /* i386-tdep.h */