1 /* Target definitions for GNU compiler for Intel x86 CPU running NeXTSTEP
2 Copyright (C) 1993, 1995, 1996, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 /* By default, target has a 80387, with IEEE FP. */
26 #undef TARGET_SUBTARGET_DEFAULT
27 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP)
29 /* Implicit library calls should use memcpy, not bcopy, etc. */
31 #define TARGET_MEM_FUNCTIONS
33 /* Machines that use the AT&T assembler syntax
34 also return floating point values in an FP register.
35 Define how to find the value returned by a function.
36 VALTYPE is the data type of the value (as a tree).
37 If the precise function being called is known, FUNC is its FUNCTION_DECL;
38 otherwise, FUNC is 0. */
41 #define VALUE_REGNO(MODE) \
42 ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode \
43 ? FIRST_FLOAT_REG : 0)
45 /* 1 if N is a possible register number for a function value. */
47 #undef FUNCTION_VALUE_REGNO_P
48 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
50 #ifdef REAL_VALUE_TO_TARGET_LONG_DOUBLE
51 #undef ASM_OUTPUT_LONG_DOUBLE
52 #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \
55 REAL_VALUE_TO_TARGET_LONG_DOUBLE (VALUE, hex); \
56 if (sizeof (int) == sizeof (long)) \
57 fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n\t.long 0x%x\n", \
58 hex[0], hex[1], hex[2]); \
60 fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n\t.long 0x%lx\n", \
61 hex[0], hex[1], hex[2]); \
65 #ifdef REAL_VALUE_TO_TARGET_DOUBLE
66 #undef ASM_OUTPUT_DOUBLE
67 #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
70 REAL_VALUE_TO_TARGET_DOUBLE (VALUE, hex); \
71 if (sizeof (int) == sizeof (long)) \
72 fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n", hex[0], hex[1]); \
74 fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n", hex[0], hex[1]); \
78 /* This is how to output an assembler line defining a `float' constant. */
80 #ifdef REAL_VALUE_TO_TARGET_SINGLE
81 #undef ASM_OUTPUT_FLOAT
82 #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
85 REAL_VALUE_TO_TARGET_SINGLE (VALUE, hex); \
86 if (sizeof (int) == sizeof (long)) \
87 fprintf (FILE, "\t.long 0x%x\n", hex); \
89 fprintf (FILE, "\t.long 0x%lx\n", hex); \
93 /* A C statement or statements which output an assembler instruction
94 opcode to the stdio stream STREAM. The macro-operand PTR is a
95 variable of type `char *' which points to the opcode name in its
96 "internal" form--the form that is written in the machine description.
98 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
99 So use `repe' instead. */
101 #undef ASM_OUTPUT_OPCODE
102 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
104 if ((PTR)[0] == 'r' \
106 && (PTR)[2] == 'p') \
108 if ((PTR)[3] == 'z') \
110 fprintf (STREAM, "repe"); \
113 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
115 fprintf (STREAM, "repne"); \
121 /* Define macro used to output shift-double opcodes when the shift
122 count is in %cl. Some assemblers require %cl as an argument;
125 GAS requires the %cl argument, so override unx386.h. */
127 #undef SHIFT_DOUBLE_OMITS_COUNT
128 #define SHIFT_DOUBLE_OMITS_COUNT 0
130 /* Print opcodes the way that GAS expects them. */
131 #define GAS_MNEMONICS 1
133 /* Names to predefine in the preprocessor for this target machine. */
135 #undef CPP_PREDEFINES
136 #define CPP_PREDEFINES "-DNeXT -Dunix -D__MACH__ -D__LITTLE_ENDIAN__ \
137 -D__ARCHITECTURE__=\"i386\" -Asystem=unix -Asystem=mach"
139 /* This accounts for the return pc and saved fp on the i386. */
141 #define OBJC_FORWARDING_STACK_OFFSET 8
142 #define OBJC_FORWARDING_MIN_OFFSET 8
144 /* We do not want a dot in internal labels. */
149 #undef ASM_GENERATE_INTERNAL_LABEL
150 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
151 sprintf ((BUF), "*%s%d", (PREFIX), (NUMBER))
153 #undef ASM_OUTPUT_INTERNAL_LABEL
154 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
155 fprintf (FILE, "%s%d:\n", PREFIX, NUM)
157 /* Output to assembler file text saying following lines
158 may contain character constants, extra white space, comments, etc. */
161 #define ASM_APP_ON "#APP\n"
163 /* Output to assembler file text saying following lines
164 no longer contain unusual constructs. */
167 #define ASM_APP_OFF "#NO_APP\n"
169 #undef ASM_OUTPUT_REG_PUSH
170 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
171 fprintf (FILE, "\tpushl %se%s\n", "%", reg_names[REGNO])
173 #undef ASM_OUTPUT_REG_POP
174 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
175 fprintf (FILE, "\tpopl %se%s\n", "%", reg_names[REGNO])
177 /* This is being overridden because the default i386 configuration
178 generates calls to "_mcount". NeXT system libraries all use
181 #undef FUNCTION_PROFILER
182 #define FUNCTION_PROFILER(FILE, LABELNO) \
186 fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
187 LPREFIX, (LABELNO)); \
188 fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
192 fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
193 fprintf (FILE, "\tcall mcount\n"); \
197 /* BEGIN Calling Convention CHANGES */
199 /* These changes violate the Intel/Unix ABI. Specifically, they
200 change the way that space for a block return value is passed to a
201 function. The ABI says that the pointer is passed on the stack.
202 We change to pass the pointer in %ebx. This makes the NeXT
203 Objective-C forwarding mechanism possible to implement on an i386. */
205 /* Do NOT pass address of structure values on the stack. */
207 #undef STRUCT_VALUE_INCOMING
210 /* Pass them in %ebx. */
212 #undef STRUCT_VALUE_REGNUM
213 #define STRUCT_VALUE_REGNUM 3
215 /* Because we are passing the pointer in a register, we don't need to
216 rely on the callee to pop it. */
218 #undef RETURN_POPS_ARGS
219 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) \
220 ((FUNDECL) && TREE_CODE (FUNDECL) == IDENTIFIER_NODE \
223 && (TYPE_ARG_TYPES (FUNTYPE) == 0 \
224 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
225 == void_type_node))) ? (SIZE) : 0)
227 /* END Calling Convention CHANGES */
229 /* NeXT still uses old binutils that don't insert nops by default
230 when the .align directive demands to insert extra space in the text
232 #undef ASM_OUTPUT_ALIGN
233 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
234 if ((LOG)!=0) fprintf ((FILE), "\t.align %d,0x90\n", (LOG))