1 /* Target-dependent code for GDB, the GNU debugger.
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. */
27 /* GDB's i386 target supports both the 32-bit Intel Architecture
28 (IA-32) and the 64-bit AMD x86-64 architecture. Internally it uses
29 a similar register layout for both.
31 - General purpose registers
33 - FPU control registers
35 - SSE control register
37 The general purpose registers for the x86-64 architecture are quite
38 different from IA-32. Therefore, the FP0_REGNUM target macro
39 determines the register number at which the FPU data registers
40 start. The number of FPU data and control registers is the same
41 for both architectures. The number of SSE registers however,
42 differs and is determined by the num_xmm_regs member of `struct
45 /* Convention for returning structures. */
49 pcc_struct_return, /* Return "short" structures in memory. */
50 reg_struct_return /* Return "short" structures in registers. */
53 /* i386 architecture specific information. */
59 /* Number of SSE registers. */
62 /* Offset of saved PC in jmp_buf. */
65 /* Convention for returning structures. */
66 enum struct_return struct_return;
68 /* Get saved PC for sigtramp. */
69 CORE_ADDR (*sigtramp_saved_pc) (struct frame_info *);
71 /* Address range where sigtramp lives. */
72 CORE_ADDR sigtramp_start;
73 CORE_ADDR sigtramp_end;
75 /* Offset of saved PC in `struct sigcontext'. */
79 /* Floating-point registers. */
81 #define FPU_REG_RAW_SIZE 10
83 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
84 (at most) in the FPU, but are zero-extended to 32 bits in GDB's
87 /* "Generic" floating point control register. */
88 #define FPC_REGNUM (FP0_REGNUM + 8)
90 /* FPU control word. */
91 #define FCTRL_REGNUM FPC_REGNUM
93 /* FPU status word. */
94 #define FSTAT_REGNUM (FPC_REGNUM + 1)
96 /* FPU register tag word. */
97 #define FTAG_REGNUM (FPC_REGNUM + 2)
99 /* FPU instruction's code segment selector, called "FPU Instruction
100 Pointer Selector" in the IA-32 manuals. */
101 #define FISEG_REGNUM (FPC_REGNUM + 3)
103 /* FPU instruction's offset within segment. */
104 #define FIOFF_REGNUM (FPC_REGNUM + 4)
106 /* FPU operand's data segment. */
107 #define FOSEG_REGNUM (FPC_REGNUM + 5)
109 /* FPU operand's offset within segment */
110 #define FOOFF_REGNUM (FPC_REGNUM + 6)
112 /* FPU opcode, bottom eleven bits. */
113 #define FOP_REGNUM (FPC_REGNUM + 7)
115 /* Return non-zero if N corresponds to a FPU data registers. */
116 #define FP_REGNUM_P(n) (FP0_REGNUM <= (n) && (n) < FPC_REGNUM)
118 /* Return non-zero if N corresponds to a FPU control register. */
119 #define FPC_REGNUM_P(n) (FPC_REGNUM <= (n) && (n) < XMM0_REGNUM)
123 /* First SSE data register. */
124 #define XMM0_REGNUM (FPC_REGNUM + 8)
126 /* SSE control/status register. */
127 #define MXCSR_REGNUM \
128 (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
130 /* Return non-zero if N corresponds to a SSE data register. */
131 #define SSE_REGNUM_P(n) (XMM0_REGNUM <= (n) && (n) < MXCSR_REGNUM)
133 /* FIXME: kettenis/2001-11-24: Obsolete macro's. */
134 #define FCS_REGNUM FISEG_REGNUM
135 #define FCOFF_REGNUM FIOFF_REGNUM
136 #define FDS_REGNUM FOSEG_REGNUM
137 #define FDOFF_REGNUM FOOFF_REGNUM
138 #define IS_FP_REGNUM(n) FP_REGNUM_P (n)
139 #define IS_FPU_CTRL_REGNUM(n) FPC_REGNUM_P (n)
140 #define IS_SSE_REGNUM(n) SSE_REGNUM_P (n)
142 #define I386_NUM_GREGS 16
143 #define I386_NUM_FREGS 16
144 #define I386_NUM_XREGS 9
146 #define I386_SSE_NUM_REGS (I386_NUM_GREGS + I386_NUM_FREGS \
149 /* Sizes of individual register sets. These cover the entire register
150 file, so summing up the sizes of those portions actually present
151 yields REGISTER_BYTES. */
152 #define I386_SIZEOF_GREGS (I386_NUM_GREGS * 4)
153 #define I386_SIZEOF_FREGS (8 * 10 + 8 * 4)
154 #define I386_SIZEOF_XREGS (8 * 16 + 4)
156 #define I386_SSE_SIZEOF_REGS (I386_SIZEOF_GREGS + I386_SIZEOF_FREGS \
159 /* Return the name of register REG. */
160 extern char const *i386_register_name (int reg);
162 /* Return the offset into the register array of the start of register
164 extern int i386_register_byte (int reg);
166 /* Return the number of bytes of storage in GDB's register array
167 occupied by register REG. */
168 extern int i386_register_raw_size (int reg);
170 /* Initialize a basic ELF architecture variant. */
171 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
173 /* Initialize a SVR4 architecture variant. */
174 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
176 /* Functions exported from i386bsd-tdep.c. */
178 extern CORE_ADDR i386bsd_sigtramp_saved_pc (struct frame_info *frame);
180 #endif /* i386-tdep.h */