1 /* Target definitions for GNU compiler for Intel x86 CPU running NeXTSTEP
2 Copyright (C) 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 /* By default, target has a 80387, with IEEE FP. */
26 #define TARGET_DEFAULT (1|0100)
28 /* Implicit library calls should use memcpy, not bcopy, etc. */
30 #define TARGET_MEM_FUNCTIONS
32 /* Machines that use the AT&T assembler syntax
33 also return floating point values in an FP register.
34 Define how to find the value returned by a function.
35 VALTYPE is the data type of the value (as a tree).
36 If the precise function being called is known, FUNC is its FUNCTION_DECL;
37 otherwise, FUNC is 0. */
40 #define VALUE_REGNO(MODE) \
41 (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
43 /* 1 if N is a possible register number for a function value. */
45 #undef FUNCTION_VALUE_REGNO_P
46 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
48 #ifdef REAL_VALUE_TO_TARGET_DOUBLE
49 #undef ASM_OUTPUT_DOUBLE
50 #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
53 REAL_VALUE_TO_TARGET_DOUBLE (VALUE, hex); \
54 fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n", hex[0], hex[1]); \
58 /* This is how to output an assembler line defining a `float' constant. */
60 #ifdef REAL_VALUE_TO_TARGET_SINGLE
61 #undef ASM_OUTPUT_FLOAT
62 #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
65 REAL_VALUE_TO_TARGET_SINGLE (VALUE, hex); \
66 fprintf (FILE, "\t.long 0x%x\n", hex); \
70 /* A C statement or statements which output an assembler instruction
71 opcode to the stdio stream STREAM. The macro-operand PTR is a
72 variable of type `char *' which points to the opcode name in its
73 "internal" form--the form that is written in the machine description.
75 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
76 So use `repe' instead. */
78 #undef ASM_OUTPUT_OPCODE
79 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
85 if ((PTR)[3] == 'z') \
87 fprintf (STREAM, "repe"); \
90 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
92 fprintf (STREAM, "repne"); \
98 /* Define macro used to output shift-double opcodes when the shift
99 count is in %cl. Some assemblers require %cl as an argument;
102 GAS requires the %cl argument, so override unx386.h. */
104 #undef AS3_SHIFT_DOUBLE
105 #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
107 /* Print opcodes the way that GAS expects them. */
108 #define GAS_MNEMONICS 1
110 /* Names to predefine in the preprocessor for this target machine. */
112 #undef CPP_PREDEFINES
113 #define CPP_PREDEFINES "-Di386 -DNeXT -Dunix -D__MACH__ -D__LITTLE_ENDIAN__ -D__ARCHITECTURE__=\"i386\""
115 /* This accounts for the return pc and saved fp on the i386. */
117 #define OBJC_FORWARDING_STACK_OFFSET 8
118 #define OBJC_FORWARDING_MIN_OFFSET 8
120 /* Compensate for botch in dbxout_init/dbxout_source_file which
121 unconditionally drops the first character from ltext_label_name */
123 #undef ASM_GENERATE_INTERNAL_LABEL
124 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
125 sprintf ((BUF), "*.%s%d", (PREFIX), (NUMBER))
127 /* Output to assembler file text saying following lines
128 may contain character constants, extra white space, comments, etc. */
131 #define ASM_APP_ON "#APP\n"
133 /* Output to assembler file text saying following lines
134 no longer contain unusual constructs. */
137 #define ASM_APP_OFF "#NO_APP\n"
139 #undef ASM_OUTPUT_REG_PUSH
140 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
141 fprintf (FILE, "\tpushl %se%s\n", "%", reg_names[REGNO])
143 #undef ASM_OUTPUT_REG_POP
144 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
145 fprintf (FILE, "\tpopl %se%s\n", "%", reg_names[REGNO])
147 /* This is being overridden because the default i386 configuration
148 generates calls to "_mcount". NeXT system libraries all use
151 #undef FUNCTION_PROFILER
152 #define FUNCTION_PROFILER(FILE, LABELNO) \
156 fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
157 LPREFIX, (LABELNO)); \
158 fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
162 fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
163 fprintf (FILE, "\tcall mcount\n"); \
167 /* BEGIN Calling Convention CHANGES */
169 /* These changes violate the Intel/Unix ABI. Specifically, they
170 change the way that space for a block return value is passed to a
171 function. The ABI says that the pointer is passed on the stack.
172 We change to pass the pointer in %ebx. This makes the NeXT
173 Objective-C forwarding mechanism possible to implement on an i386. */
175 /* Do NOT pass address of structure values on the stack. */
177 #undef STRUCT_VALUE_INCOMING
180 /* Pass them in %ebx. */
182 #undef STRUCT_VALUE_REGNUM
183 #define STRUCT_VALUE_REGNUM 3
185 /* Because we are passing the pointer in a register, we don't need to
186 rely on the callee to pop it. */
188 #undef RETURN_POPS_ARGS
189 #define RETURN_POPS_ARGS(FUNTYPE,SIZE) \
190 (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE \
193 && (TYPE_ARG_TYPES (FUNTYPE) == 0 \
194 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
195 == void_type_node))) ? (SIZE) : 0)
197 /* END Calling Convention CHANGES */