1 /* Target-dependent code for GDB, the GNU debugger.
2 Copyright 2001, 2002, 2003
3 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
29 /* GDB's i386 target supports both the 32-bit Intel Architecture
30 (IA-32) and the 64-bit AMD x86-64 architecture. Internally it uses
31 a similar register layout for both.
33 - General purpose registers
35 - FPU control registers
37 - SSE control register
39 The general purpose registers for the x86-64 architecture are quite
40 different from IA-32. Therefore, the FP0_REGNUM target macro
41 determines the register number at which the FPU data registers
42 start. The number of FPU data and control registers is the same
43 for both architectures. The number of SSE registers however,
44 differs and is determined by the num_xmm_regs member of `struct
47 /* Convention for returning structures. */
51 pcc_struct_return, /* Return "short" structures in memory. */
52 reg_struct_return /* Return "short" structures in registers. */
55 /* i386 architecture specific information. */
58 /* Number of SSE registers. */
61 /* Offset of saved PC in jmp_buf. */
64 /* Convention for returning structures. */
65 enum struct_return struct_return;
67 /* Address range where sigtramp lives. */
68 CORE_ADDR sigtramp_start;
69 CORE_ADDR sigtramp_end;
71 /* Get address of sigcontext for sigtramp. */
72 CORE_ADDR (*sigcontext_addr) (struct frame_info *);
74 /* Offset of registers in `struct sigcontext'. */
78 /* Offset of saved PC and SP in `struct sigcontext'. Usage of these
79 is deprecated, please use `sc_reg_offset' instead. */
84 /* Floating-point registers. */
86 #define FPU_REG_RAW_SIZE 10
88 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
89 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
92 /* "Generic" floating point control register. */
93 #define FPC_REGNUM (FP0_REGNUM + 8)
95 /* FPU control word. */
96 #define FCTRL_REGNUM FPC_REGNUM
98 /* FPU status word. */
99 #define FSTAT_REGNUM (FPC_REGNUM + 1)
101 /* FPU register tag word. */
102 #define FTAG_REGNUM (FPC_REGNUM + 2)
104 /* FPU instruction's code segment selector, called "FPU Instruction
105 Pointer Selector" in the IA-32 manuals. */
106 #define FISEG_REGNUM (FPC_REGNUM + 3)
108 /* FPU instruction's offset within segment. */
109 #define FIOFF_REGNUM (FPC_REGNUM + 4)
111 /* FPU operand's data segment. */
112 #define FOSEG_REGNUM (FPC_REGNUM + 5)
114 /* FPU operand's offset within segment */
115 #define FOOFF_REGNUM (FPC_REGNUM + 6)
117 /* FPU opcode, bottom eleven bits. */
118 #define FOP_REGNUM (FPC_REGNUM + 7)
120 /* Return non-zero if REGNUM matches the FP register and the FP
121 register set is active. */
122 extern int i386_fp_regnum_p (int regnum);
123 extern int i386_fpc_regnum_p (int regnum);
127 /* First SSE data register. */
128 #define XMM0_REGNUM (FPC_REGNUM + 8)
130 /* SSE control/status register. */
131 #define MXCSR_REGNUM \
132 (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
134 /* Return non-zero if REGNUM matches the SSE register and the SSE
135 register set is active. */
136 extern int i386_sse_regnum_p (int regnum);
137 extern int i386_mxcsr_regnum_p (int regnum);
139 /* FIXME: kettenis/2001-11-24: Obsolete macro's. */
140 #define FCS_REGNUM FISEG_REGNUM
141 #define FCOFF_REGNUM FIOFF_REGNUM
142 #define FDS_REGNUM FOSEG_REGNUM
143 #define FDOFF_REGNUM FOOFF_REGNUM
145 /* Register numbers of various important registers. */
147 #define I386_EAX_REGNUM 0 /* %eax */
148 #define I386_EDX_REGNUM 2 /* %edx */
149 #define I386_ESP_REGNUM 4 /* %esp */
150 #define I386_EBP_REGNUM 5 /* %ebp */
151 #define I386_EIP_REGNUM 8 /* %eip */
152 #define I386_EFLAGS_REGNUM 9 /* %eflags */
153 #define I386_ST0_REGNUM 16 /* %st(0) */
155 #define I386_NUM_GREGS 16
156 #define I386_NUM_FREGS 16
157 #define I386_NUM_XREGS 9
159 #define I386_SSE_NUM_REGS (I386_NUM_GREGS + I386_NUM_FREGS \
162 /* Size of the largest register. */
163 #define I386_MAX_REGISTER_SIZE 16
165 /* Functions exported from i386-tdep.c. */
166 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
167 extern int i386_frameless_signal_p (struct frame_info *frame);
169 /* Return the name of register REG. */
170 extern char const *i386_register_name (int reg);
172 /* Return non-zero if REGNUM is a member of the specified group. */
173 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
174 struct reggroup *group);
176 /* Initialize a basic ELF architecture variant. */
177 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
179 /* Initialize a SVR4 architecture variant. */
180 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
182 /* Functions exported from i386bsd-tdep.c. */
184 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
186 #endif /* i386-tdep.h */