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1.1 root 1: /* Definitions for Intel 386 running system V with gnu tools
2: Copyright (C) 1988 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
6: GNU CC 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, or (at your option)
9: any later version.
10:
11: GNU CC 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.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU CC; see the file COPYING. If not, write to
18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
1.1.1.2 ! root 20: /* Note that seq386gas.h is a GAS configuration that does not use this
! 21: file. */
1.1 root 22:
23: #include "i386.h"
24: /* Use the bsd assembler syntax. */
25: /* we need to do this because gas is really a bsd style assembler,
26: * and so doesn't work well this these att-isms:
27: *
28: * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
29: * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
30: * used to define bss static space
31: *
32: * Next is the question of whether to uses underscores. RMS didn't
33: * like this idea at first, but since it is now obvious that we
34: * need this separate tm file for use with gas, at least to get
35: * dbx debugging info, I think we should also switch to underscores.
36: * We can keep i386v for real att style output, and the few
37: * people who want both form will have to compile twice.
38: */
39:
40: #include "bsd386.h"
41:
42: /* these come from bsd386.h, but are specific to sequent */
43: #undef DBX_NO_XREFS
44: #undef DBX_CONTIN_LENGTH
45:
46: /* By default, target has a 80387. */
47:
48: #define TARGET_DEFAULT 1
49:
50: /* Specify predefined symbols in preprocessor. */
51:
52: #define CPP_PREDEFINES "-Dunix -Di386"
53:
54: /* Allow #sccs in preprocessor. */
55:
56: #define SCCS_DIRECTIVE
57:
58: /* Output #ident as a .ident. */
59:
60: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
61:
62: /* We do not want to output SDB debugging information. */
63:
64: #undef SDB_DEBUGGING_INFO
65:
66: /* We want to output DBX debugging information. */
67:
68: #define DBX_DEBUGGING_INFO
69:
70: /* Implicit library calls should use memcpy, not bcopy, etc. */
71:
72: #define TARGET_MEM_FUNCTIONS
73:
74: #if 0 /* People say gas uses the log as the arg to .align. */
75: /* When using gas, .align N aligns to an N-byte boundary. */
76:
77: #undef ASM_OUTPUT_ALIGN
78: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
79: if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
80: #endif
81:
82: /* Align labels, etc. at 4-byte boundaries.
83: For the 486, align to 16-byte boundary for sake of cache. */
84:
85: #undef ASM_OUTPUT_ALIGN_CODE
86: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
87: fprintf ((FILE), "\t.align %d,0x90\n", \
88: TARGET_486 ? 4 : 2); /* Use log of 16 or log of 4 as arg. */
89:
90: /* Align start of loop at 4-byte boundary. */
91:
92: #undef ASM_OUTPUT_LOOP_ALIGN
93: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
94: fprintf ((FILE), "\t.align 2,0x90\n"); /* Use log of 4 as arg. */
95:
96: /* Machines that use the AT&T assembler syntax
97: also return floating point values in an FP register. */
98: /* Define how to find the value returned by a function.
99: VALTYPE is the data type of the value (as a tree).
100: If the precise function being called is known, FUNC is its FUNCTION_DECL;
101: otherwise, FUNC is 0. */
102:
103: #define VALUE_REGNO(MODE) \
104: (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
105:
106: /* 1 if N is a possible register number for a function value. */
107:
108: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
109:
110: #undef ASM_FILE_START
111: #define ASM_FILE_START(FILE) \
112: fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
113:
114: /* A C statement or statements which output an assembler instruction
115: opcode to the stdio stream STREAM. The macro-operand PTR is a
116: variable of type `char *' which points to the opcode name in its
117: "internal" form--the form that is written in the machine description.
118:
119: GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
120: So use `repe' instead. */
121:
122: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
123: { \
124: if ((PTR)[0] == 'r' \
125: && (PTR)[1] == 'e' \
1.1.1.2 ! root 126: && (PTR)[2] == 'p') \
1.1 root 127: { \
1.1.1.2 ! root 128: if ((PTR)[3] == 'z') \
! 129: { \
! 130: fprintf (STREAM, "repe"); \
! 131: (PTR) += 4; \
! 132: } \
! 133: else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
! 134: { \
! 135: fprintf (STREAM, "repne"); \
! 136: (PTR) += 5; \
! 137: } \
1.1 root 138: } \
139: }
1.1.1.2 ! root 140:
! 141: /* Define macro used to output shift-double opcodes when the shift
! 142: count is in %cl. Some assemblers require %cl as an argument;
! 143: some don't.
! 144:
! 145: GAS requires the %cl argument, so override unx386.h. */
! 146:
! 147: #undef AS3_SHIFT_DOUBLE
! 148: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
! 149:
! 150: /* Print opcodes the way that GAS expects them. */
! 151: #define GAS_MNEMONICS 1
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