1 /* Target-dependent code for the i386.
3 Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007, 2008
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;
111 /* Floating-point registers. */
113 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
114 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
117 /* Return non-zero if REGNUM matches the FP register and the FP
118 register set is active. */
119 extern int i386_fp_regnum_p (int regnum);
120 extern int i386_fpc_regnum_p (int regnum);
122 /* Register numbers of various important registers. */
126 I386_EAX_REGNUM, /* %eax */
127 I386_ECX_REGNUM, /* %ecx */
128 I386_EDX_REGNUM, /* %edx */
129 I386_EBX_REGNUM, /* %ebx */
130 I386_ESP_REGNUM, /* %esp */
131 I386_EBP_REGNUM, /* %ebp */
132 I386_ESI_REGNUM, /* %esi */
133 I386_EDI_REGNUM, /* %edi */
134 I386_EIP_REGNUM, /* %eip */
135 I386_EFLAGS_REGNUM, /* %eflags */
136 I386_CS_REGNUM, /* %cs */
137 I386_SS_REGNUM, /* %ss */
138 I386_DS_REGNUM, /* %ds */
139 I386_ES_REGNUM, /* %es */
140 I386_FS_REGNUM, /* %fs */
141 I386_GS_REGNUM, /* %gs */
142 I386_ST0_REGNUM /* %st(0) */
145 #define I386_NUM_GREGS 16
146 #define I386_NUM_FREGS 16
147 #define I386_NUM_XREGS 9
149 #define I386_SSE_NUM_REGS (I386_NUM_GREGS + I386_NUM_FREGS \
152 /* Size of the largest register. */
153 #define I386_MAX_REGISTER_SIZE 16
155 /* Types for i386-specific registers. */
156 extern struct type *i386_eflags_type;
157 extern struct type *i386_mxcsr_type;
159 extern struct type *i386_mmx_type (struct gdbarch *gdbarch);
160 extern struct type *i386_sse_type (struct gdbarch *gdbarch);
162 /* Segment selectors. */
163 #define I386_SEL_RPL 0x0003 /* Requester's Privilege Level mask. */
164 #define I386_SEL_UPL 0x0003 /* User Privilige Level. */
165 #define I386_SEL_KPL 0x0000 /* Kernel Privilige Level. */
167 /* Functions exported from i386-tdep.c. */
168 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
170 /* Return the name of register REGNUM. */
171 extern char const *i386_register_name (struct gdbarch * gdbarch, int regnum);
173 /* Return non-zero if REGNUM is a member of the specified group. */
174 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
175 struct reggroup *group);
177 /* Supply register REGNUM from the general-purpose register set REGSET
178 to register cache REGCACHE. If REGNUM is -1, do this for all
179 registers in REGSET. */
180 extern void i386_supply_gregset (const struct regset *regset,
181 struct regcache *regcache, int regnum,
182 const void *gregs, size_t len);
184 /* Collect register REGNUM from the register cache REGCACHE and store
185 it in the buffer specified by GREGS and LEN as described by the
186 general-purpose register set REGSET. If REGNUM is -1, do this for
187 all registers in REGSET. */
188 extern void i386_collect_gregset (const struct regset *regset,
189 const struct regcache *regcache,
190 int regnum, void *gregs, size_t len);
192 /* Return the appropriate register set for the core section identified
193 by SECT_NAME and SECT_SIZE. */
194 extern const struct regset *
195 i386_regset_from_core_section (struct gdbarch *gdbarch,
196 const char *sect_name, size_t sect_size);
198 /* Initialize a basic ELF architecture variant. */
199 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
201 /* Initialize a SVR4 architecture variant. */
202 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
205 /* Functions and variables exported from i386bsd-tdep.c. */
207 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
208 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
209 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
210 extern CORE_ADDR i386obsd_sigtramp_start_addr;
211 extern CORE_ADDR i386obsd_sigtramp_end_addr;
212 extern int i386fbsd4_sc_reg_offset[];
213 extern int i386fbsd_sc_reg_offset[];
214 extern int i386nbsd_sc_reg_offset[];
215 extern int i386obsd_sc_reg_offset[];
216 extern int i386bsd_sc_reg_offset[];
218 #endif /* i386-tdep.h */