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1.1 root 1: /* Target definitions for GNU compiler for Intel x86 CPU running NeXTSTEP
2: Copyright (C) 1993 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/gas.h"
21: #include "nextstep.h"
22:
23: #define MACHO_PIC 1
24:
25: #ifndef MACHOPIC_PURE
26: #define MACHOPIC_PURE (flag_pic == 2)
27: #define MACHOPIC_INDIRECT (flag_pic)
28: #define MACHOPIC_JUST_INDIRECT (flag_pic == 1)
29: #endif
30:
31: #define DEFAULT_TARGET_ARCH "i386"
32:
33: /* By default, target has a 80387, with IEEE FP. */
34:
35: #undef TARGET_DEFAULT
36: #define TARGET_DEFAULT (1|0100)
37:
38: #undef SUBTARGET_SWITCHES
39: #define SUBTARGET_SWITCHES \
40: { "unaligned-text", 0400 }, \
41: { "no-unaligned-text", -0400 },
42:
43: #define TARGET_NO_LOOP_ALIGNMENT (target_flags & 0400)
44:
45: /* The NeXT configuration aligns everything at 4 byte boundary.
46: Even though this is not optimal with respect to cache lines, this
47: saves us sigificant space, which is a precious ressource on a
48: NeXTSTEP machine. */
49:
50: #undef ASM_OUTPUT_ALIGN_CODE
51: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
52: if (!TARGET_NO_LOOP_ALIGNMENT) \
53: fprintf ((FILE), "\t.align 2,0x90\n")
54:
55: /* Align start of loop at 4-byte boundary. */
56:
57: #undef ASM_OUTPUT_LOOP_ALIGN
58: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
59: if (!TARGET_NO_LOOP_ALIGNMENT) \
60: fprintf ((FILE), "\t.align 2,0x90\n"); /* Use log of 4 as arg. */
61:
62: #undef ASM_OUTPUT_ALIGN
63: #undef ASM_OUTPUT_ALIGN
64: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
65: do { if ((LOG) != 0) \
66: if (in_text_section ()) \
67: fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
68: else \
69: fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
70: } while (0)
71:
72:
73: #undef FUNCTION_BOUNDARY
74: #define FUNCTION_BOUNDARY 32
75:
76: #define TARGET_ARCHITECTURE \
77: { { "i386", 2 }, /* Treat i386 like i486. */ \
78: { "i486", 2 }, /* Turn on -m486. */ \
79: { "i486SX", 2 }, /* Turn on -m486. */ \
80: /* { "i586", 4 }, */ /* Turn on -m486. */ \
81: /* { "i586SX", 4 }, */ /* Turn on -m586. */ \
82: }
83:
84: /* Implicit library calls should use memcpy, not bcopy, etc. */
85:
86: #define TARGET_MEM_FUNCTIONS
87:
88: /* Machines that use the AT&T assembler syntax
89: also return floating point values in an FP register.
90: Define how to find the value returned by a function.
91: VALTYPE is the data type of the value (as a tree).
92: If the precise function being called is known, FUNC is its FUNCTION_DECL;
93: otherwise, FUNC is 0. */
94:
95: #undef VALUE_REGNO
96: #define VALUE_REGNO(MODE) \
97: ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode \
98: ? FIRST_FLOAT_REG : 0)
99:
100: /* 1 if N is a possible register number for a function value. */
101:
102: #undef FUNCTION_VALUE_REGNO_P
103: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
104:
105: #ifdef REAL_VALUE_TO_TARGET_LONG_DOUBLE
106: #undef ASM_OUTPUT_LONG_DOUBLE
107: #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \
108: do { \
109: long hex[3]; \
110: REAL_VALUE_TO_TARGET_LONG_DOUBLE (VALUE, hex); \
111: if (sizeof (int) == sizeof (long)) \
112: fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n\t.long 0x%x\n", \
113: hex[0], hex[1], hex[2]); \
114: else \
115: fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n\t.long 0x%lx\n", \
116: hex[0], hex[1], hex[2]); \
117: } while (0)
118: #endif
119:
120: #ifdef REAL_VALUE_TO_TARGET_DOUBLE
121: #undef ASM_OUTPUT_DOUBLE
122: #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
123: do { \
124: long hex[2]; \
125: REAL_VALUE_TO_TARGET_DOUBLE (VALUE, hex); \
126: if (sizeof (int) == sizeof (long)) \
127: fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n", hex[0], hex[1]); \
128: else \
129: fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n", hex[0], hex[1]); \
130: } while (0)
131: #endif
132:
133: /* This is how to output an assembler line defining a `float' constant. */
134:
135: #ifdef REAL_VALUE_TO_TARGET_SINGLE
136: #undef ASM_OUTPUT_FLOAT
137: #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
138: do { \
139: long hex; \
140: REAL_VALUE_TO_TARGET_SINGLE (VALUE, hex); \
141: if (sizeof (int) == sizeof (long)) \
142: fprintf (FILE, "\t.long 0x%x\n", hex); \
143: else \
144: fprintf (FILE, "\t.long 0x%lx\n", hex); \
145: } while (0)
146: #endif
147:
148: /* A C statement or statements which output an assembler instruction
149: opcode to the stdio stream STREAM. The macro-operand PTR is a
150: variable of type `char *' which points to the opcode name in its
151: "internal" form--the form that is written in the machine description.
152:
153: GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
154: So use `repe' instead. */
155:
156: #undef ASM_OUTPUT_OPCODE
157: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
158: { \
159: if ((PTR)[0] == 'r' \
160: && (PTR)[1] == 'e' \
161: && (PTR)[2] == 'p') \
162: { \
163: if ((PTR)[3] == 'z') \
164: { \
165: fprintf (STREAM, "repe"); \
166: (PTR) += 4; \
167: } \
168: else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
169: { \
170: fprintf (STREAM, "repne"); \
171: (PTR) += 5; \
172: } \
173: } \
174: }
175:
176: /* Define macro used to output shift-double opcodes when the shift
177: count is in %cl. Some assemblers require %cl as an argument;
178: some don't.
179:
180: GAS requires the %cl argument, so override unx386.h. */
181:
182: #undef AS3_SHIFT_DOUBLE
183: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
184:
185: /* Print opcodes the way that GAS expects them. */
186: #define GAS_MNEMONICS 1
187:
188: /* Names to predefine in the preprocessor for this target machine. */
189:
190: #undef CPP_PREDEFINES
191: #define CPP_PREDEFINES "-Di386 -DNeXT -Dunix -D__MACH__ -D__LITTLE_ENDIAN__ -D__ARCHITECTURE__=\"i386\" "
192:
193: /* This accounts for the return pc and saved fp on the i386. */
194:
195: #define OBJC_FORWARDING_STACK_OFFSET 8
196: #define OBJC_FORWARDING_MIN_OFFSET 8
197:
198: /* We do not want a dot in internal labels. */
199:
200: #undef LPREFIX
201: #define LPREFIX "L"
202:
203: #undef ASM_GENERATE_INTERNAL_LABEL
204: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
205: sprintf ((BUF), "*%s%d", (PREFIX), (NUMBER))
206:
207: #undef ASM_OUTPUT_INTERNAL_LABEL
208: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
209: fprintf (FILE, "%s%d:\n", PREFIX, NUM)
210:
211: /* Output to assembler file text saying following lines
212: may contain character constants, extra white space, comments, etc. */
213:
214: #undef ASM_APP_ON
215: #define ASM_APP_ON "#APP\n"
216:
217: /* Output to assembler file text saying following lines
218: no longer contain unusual constructs. */
219:
220: #undef ASM_APP_OFF
221: #define ASM_APP_OFF "#NO_APP\n"
222:
223: #undef ASM_OUTPUT_REG_PUSH
224: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
225: fprintf (FILE, "\tpushl %se%s\n", "%", reg_names[REGNO])
226:
227: #undef ASM_OUTPUT_REG_POP
228: #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
229: fprintf (FILE, "\tpopl %se%s\n", "%", reg_names[REGNO])
230:
231: /* This is being overridden because the default i386 configuration
232: generates calls to "_mcount". NeXT system libraries all use
233: "mcount". */
234:
235: #undef FUNCTION_PROFILER
236: #define FUNCTION_PROFILER(FILE, LABELNO) \
237: { \
238: if (flag_pic) \
239: { \
240: fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
241: LPREFIX, (LABELNO)); \
242: fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
243: } \
244: else \
245: { \
246: fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
247: fprintf (FILE, "\tcall mcount\n"); \
248: } \
249: }
250:
251: /* BEGIN Calling Convention CHANGES */
252:
253: /* These changes violate the Intel/Unix ABI. Specifically, they
254: change the way that space for a block return value is passed to a
255: function. The ABI says that the pointer is passed on the stack.
256: We change to pass the pointer in %ebx. This makes the NeXT
257: Objective-C forwarding mechanism possible to implement on an i386. */
258:
259: /* Do NOT pass address of structure values on the stack. */
260:
261: #undef STRUCT_VALUE_INCOMING
262: #undef STRUCT_VALUE
263:
264: /* Pass them in %ebx. */
265:
266: #undef STRUCT_VALUE_REGNUM
267: #define STRUCT_VALUE_REGNUM 3
268:
269: /* Because we are passing the pointer in a register, we don't need to
270: rely on the callee to pop it. */
271:
272: #undef RETURN_POPS_ARGS
273: #define RETURN_POPS_ARGS(FUNTYPE,SIZE) \
274: (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE \
275: ? 0 \
276: : (TARGET_RTD \
277: && (TYPE_ARG_TYPES (FUNTYPE) == 0 \
278: || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
279: == void_type_node))) ? (SIZE) : 0)
280:
281: /* END Calling Convention CHANGES */
282:
283: /* Turn on floating point precision control as default */
284:
285: /* #define DEFAULT_FPPC 1 */
286:
287: #undef ASM_OUTPUT_ADDR_DIFF_ELT
288: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
289: fprintf (FILE, "\t.long %s%d-%s%d\n",LPREFIX, VALUE,LPREFIX, REL)
290:
291:
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