1 /* Macro definitions for i386, Unix System V.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 /* First pick up the generic *86 target file. */
26 #include "i386/tm-i386.h"
28 /* Number of traps that happen between exec'ing the shell to run an
29 inferior, and when we finally get to the inferior code. This is
30 2 on most implementations. Override here to 4. */
32 #undef START_INFERIOR_TRAPS_EXPECTED
33 #define START_INFERIOR_TRAPS_EXPECTED 4
35 /* Number of machine registers */
40 /* Initializer for an array of names of registers.
41 There should be NUM_REGS strings in this initializer. */
43 /* the order of the first 8 registers must match the compiler's
44 * numbering scheme (which is the same as the 386 scheme)
45 * also, this table must match regmap in i386-pinsn.c.
49 #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
50 "esp", "ebp", "esi", "edi", \
51 "eip", "ps", "cs", "ss", \
52 "ds", "es", "fs", "gs", \
55 /* Total amount of space needed to store our copies of the machine's
56 register state, the array `registers'. */
59 #define REGISTER_BYTES (NUM_REGS * 4)
61 /* Index within `registers' of the first byte of the space for
65 #define REGISTER_BYTE(N) ((N)*4)
67 /* Number of bytes of storage in the actual machine representation
70 #undef REGISTER_RAW_SIZE
71 #define REGISTER_RAW_SIZE(N) (4)
73 /* Number of bytes of storage in the program's representation
76 #undef REGISTER_VIRTUAL_SIZE
77 #define REGISTER_VIRTUAL_SIZE(N) (4)
79 /* Largest value REGISTER_RAW_SIZE can have. */
81 #undef MAX_REGISTER_RAW_SIZE
82 #define MAX_REGISTER_RAW_SIZE 4
84 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
86 #undef MAX_REGISTER_VIRTUAL_SIZE
87 #define MAX_REGISTER_VIRTUAL_SIZE 4
89 /* Return the GDB type object for the "standard" data type
90 of data in register N. */
91 /* Perhaps si and di should go here, but potentially they could be
92 used for things other than address. */
94 #undef REGISTER_VIRTUAL_TYPE
95 #define REGISTER_VIRTUAL_TYPE(N) \
96 ((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ? \
97 lookup_pointer_type (builtin_type_void) : builtin_type_int)
99 /* Store the address of the place in which to copy the structure the
100 subroutine will return. This is called from call_function. */
102 #undef STORE_STRUCT_RETURN
103 #define STORE_STRUCT_RETURN(ADDR, SP) \
104 { char buf[REGISTER_SIZE]; \
105 (SP) -= sizeof (ADDR); \
106 store_address (buf, sizeof (ADDR), ADDR); \
107 write_memory ((SP), buf, sizeof (ADDR)); }
109 /* Extract from an array REGBUF containing the (raw) register state
110 a function return value of type TYPE, and copy that, in virtual format,
113 #undef EXTRACT_RETURN_VALUE
114 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
115 memcpy ((VALBUF), (REGBUF), TYPE_LENGTH (TYPE))
117 /* Write into appropriate registers a function return value
118 of type TYPE, given in virtual format. */
120 #undef STORE_RETURN_VALUE
121 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
122 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
125 /* Describe the pointer in each stack frame to the previous stack frame
128 /* FRAME_CHAIN takes a frame's nominal address
129 and produces the frame's chain-pointer. */
132 #define FRAME_CHAIN(thisframe) \
133 (!inside_entry_file ((thisframe)->pc) ? \
134 read_memory_integer ((thisframe)->frame, 4) :\
137 /* Define other aspects of the stack frame. */
139 /* A macro that tells us whether the function invocation represented
140 by FI does not have a frame on the stack associated with it. If it
141 does not, FRAMELESS is set to 1, else 0. */
143 #undef FRAMELESS_FUNCTION_INVOCATION
144 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
145 (frameless_look_for_prologue (FI))
147 #undef FRAME_SAVED_PC
148 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
150 /* Return number of args passed to a frame.
151 Can return -1, meaning no way to tell. */
153 #undef FRAME_NUM_ARGS
154 #define FRAME_NUM_ARGS(fi) (-1)
156 #ifdef __STDC__ /* Forward decl's for prototypes */
158 struct frame_saved_regs
;
162 i386_frame_num_args
PARAMS ((struct frame_info
*));
164 #endif /* ifndef TM_I386V_H */
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