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1.1 root 1: /* Definitions for Sequent Intel 386.
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:
20: #include "i386.h"
21:
22: /* Use the BSD assembler syntax. */
23:
24: #include "bsd386.h"
25:
26: /* By default, target has a 80387. */
27:
28: #define TARGET_DEFAULT 1
29:
30: /* Specify predefined symbols in preprocessor. */
31:
32: #define CPP_PREDEFINES "-Dunix -Di386 -Dsequent"
33:
34: /* Pass -Z and -ZO options to the linker. */
35:
36: #define LINK_SPEC "%{Z*}"
37:
38: /* Link with libg.a when debugging, for dbx's sake. */
39:
40: #define LIB_SPEC "%{g:-lg} %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} "
41:
42: /* We don't want to output SDB debugging information. */
43:
44: #undef SDB_DEBUGGING_INFO
45:
46: /* We want to output DBX debugging information. */
47:
48: #define DBX_DEBUGGING_INFO
49:
50: /* gcc order is ax, dx, cx, bx, si, di, bp, sp, st, st.
51: * dbx order is ax, dx, cx, st(0), st(1), bx, si, di, st(2), st(3),
52: * st(4), st(5), st(6), st(7), sp, bp */
53:
54: /* ??? The right thing would be to change the ordering of the
55: registers to correspond to the conventions of this system,
56: and get rid of DBX_REGISTER_NUMBER. */
57:
58: #undef DBX_REGISTER_NUMBER
59: #define DBX_REGISTER_NUMBER(n) \
60: ((n) < 3 ? (n) : (n) < 6 ? (n) + 2 \
61: : (n) == 6 ? 15 : (n) == 7 ? 14 : 3)
62:
63: /* Prevent anything from being allocated in the register pair cx/bx,
64: since that would confuse GDB. */
65:
66: #undef HARD_REGNO_MODE_OK
67: #define HARD_REGNO_MODE_OK(REGNO, MODE) \
68: (((REGNO) < 2 ? 1 \
69: : (REGNO) < 4 ? 1 \
70: : (REGNO) >= 8 ? (GET_MODE_CLASS (MODE) == MODE_FLOAT \
71: || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT) \
72: : (MODE) != QImode) \
73: && ! (REGNO == 2 && GET_MODE_UNIT_SIZE (MODE) > 4))
74:
75: /* Floating-point return values come in the FP register. */
76:
77: #define VALUE_REGNO(MODE) \
78: (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
79:
80: /* 1 if N is a possible register number for a function value. */
81:
82: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
83:
84: /* Output assembler code to FILE to increment profiler label # LABELNO
85: for profiling a function entry. */
86:
87: #undef FUNCTION_PROFILER
88: #define FUNCTION_PROFILER(FILE, LABELNO) \
89: fprintf (FILE, "\tmovl $LP%d,%%eax\n\tcall mcount\n", (LABELNO));
90:
91: /* Assember pseudo-op for shared data segment. */
92: #define SHARED_SECTION_ASM_OP ".shdata"
93:
94: /* A C statement or statements which output an assembler instruction
95: opcode to the stdio stream STREAM. The macro-operand PTR is a
96: variable of type `char *' which points to the opcode name in its
97: "internal" form--the form that is written in the machine description.
98:
99: The Sequent assembler (identified as "Balance 8000 Assembler
100: 07/17/85 3.90" by "as -v") does not understand the `movs[bwl]' string
101: move mnemonics - it uses `smov[bwl]' instead. Change "movs" into
102: "smov", carefully avoiding the sign-extend opcodes. */
103:
104: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
105: { \
106: if ((PTR)[0] == 'm' \
107: && (PTR)[1] == 'o' \
108: && (PTR)[2] == 'v' \
109: && (PTR)[3] == 's' \
110: && ((PTR)[4] == 'b' || (PTR)[4] == 'w' || (PTR)[4] == 'l') \
111: && ((PTR)[5] == ' ' || (PTR)[5] == '\t'|| (PTR)[5] == '\0')) \
112: { \
113: fprintf (STREAM, "smov"); \
114: (PTR) += 4; \
115: } \
116: }
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