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1.1 root 1: /* Target definitions for GNU compiler for Intel 80860 running System V.4
2: Copyright (C) 1991 Free Software Foundation, Inc.
3:
1.1.1.3 root 4: Written by Ron Guilmette ([email protected]).
1.1 root 5:
6: This file is part of GNU CC.
7:
8: GNU CC is free software; you can redistribute it and/or modify
9: it under the terms of the GNU General Public License as published by
10: the Free Software Foundation; either version 2, or (at your option)
11: any later version.
12:
13: GNU CC is distributed in the hope that it will be useful,
14: but WITHOUT ANY WARRANTY; without even the implied warranty of
15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: GNU General Public License for more details.
17:
18: You should have received a copy of the GNU General Public License
19: along with GNU CC; see the file COPYING. If not, write to
1.1.1.4 ! root 20: the Free Software Foundation, 59 Temple Place - Suite 330,
! 21: Boston, MA 02111-1307, USA. */
1.1 root 22:
23: #include "i860/i860.h"
24: #include "svr4.h"
25:
26: #undef TARGET_VERSION
27: #define TARGET_VERSION fprintf (stderr, " (i860 System V Release 4)");
28:
29: /* Provide a set of pre-definitions and pre-assertions appropriate for
30: the i860 running svr4. Note that the symbol `__svr4__' MUST BE
31: DEFINED! It is needed so that the va_list struct in va-i860.h
32: will get correctly defined for the svr4 (ABI compliant) case rather
33: than for the previous (svr3, svr2, ...) case. It also needs to be
34: defined so that the correct (svr4) version of __builtin_saveregs
35: will be selected when we are building gnulib2.c.
36: __svr4__ is our extension. */
37:
38: #define CPP_PREDEFINES \
1.1.1.2 root 39: "-Di860 -Dunix -DSVR4 -D__svr4__ -Asystem(unix) -Asystem(svr4) -Acpu(i860) -Amachine(i860)"
1.1 root 40:
41: /* The prefix to be used in assembler output for all names of registers.
42: This string gets prepended to all i860 register names (svr4 only). */
43:
44: #define I860_REG_PREFIX "%"
45:
46: #define ASM_COMMENT_START "#"
47:
48: #undef TYPE_OPERAND_FMT
49: #define TYPE_OPERAND_FMT "\"%s\""
50:
51: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
52:
53: /* The following macro definition overrides the one in i860.h
54: because the svr4 i860 assembler requires a different syntax
55: for getting parts of constant/relocatable values. */
56:
57: #undef PRINT_OPERAND_PART
58: #define PRINT_OPERAND_PART(FILE, X, PART_CODE) \
59: do { fprintf (FILE, "["); \
60: output_address (X); \
61: fprintf (FILE, "]@%s", PART_CODE); \
62: } while (0)
63:
64: /* If the host and target formats match, output the floats as hex. */
65: #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
66: #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
67:
68: /* This is how to output an assembler line defining a `double' constant.
69: Note that the native i860/svr4 ELF assembler can't properly handle
70: infinity. It generates an incorrect (non-infinity) value when given
71: `.double 99e9999' and it doesn't grok `inf' at all. It also mishandles
72: NaNs and -0.0. */
73:
74: #undef ASM_OUTPUT_DOUBLE
75: #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
76: { \
77: if (REAL_VALUE_ISINF (VALUE) \
78: || REAL_VALUE_ISNAN (VALUE) \
79: || REAL_VALUE_MINUS_ZERO (VALUE)) \
80: { \
81: long t[2]; \
82: REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), t); \
83: fprintf (FILE, "\t.word 0x%lx\n\t.word 0x%lx\n", t[0], t[1]); \
84: } \
85: else \
86: fprintf (FILE, "\t.double %.20e\n", VALUE); \
87: }
88:
89: /* This is how to output an assembler line defining a `float' constant.
90: Note that the native i860/svr4 ELF assembler can't properly handle
91: infinity. It actually generates an assembly time error when given
92: `.float 99e9999' and it doesn't grok `inf' at all. It also mishandles
93: NaNs and -0.0. */
94:
95: #undef ASM_OUTPUT_FLOAT
96: #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
97: { \
98: if (REAL_VALUE_ISINF (VALUE) \
99: || REAL_VALUE_ISNAN (VALUE) \
100: || REAL_VALUE_MINUS_ZERO (VALUE)) \
101: { \
102: long t; \
103: REAL_VALUE_TO_TARGET_SINGLE ((VALUE), t); \
104: fprintf (FILE, "\t.word 0x%lx\n", t); \
105: } \
106: else \
107: fprintf (FILE, "\t.float %.12e\n", VALUE); \
108: }
109:
110: #endif /* word order matches */
111: #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
112:
113: #undef ASM_FILE_START
114: #define ASM_FILE_START(FILE) \
115: do { output_file_directive (FILE, main_input_filename); \
116: fprintf (FILE, "\t.version\t\"01.01\"\n"); \
117: } while (0)
118:
119: /* Output the special word the svr4 SDB wants to see just before
120: the first word of each function's prologue code. */
121:
122: extern char *current_function_original_name;
123:
124: /* This special macro is used to output a magic word just before the
125: first word of each function. On some versions of UNIX running on
126: the i860, this word can be any word that looks like a NOP, however
127: under svr4, this neds to be an `shr r0,r0,r0' instruction in which
128: the normally unused low-order bits contain the length of the function
129: prologue code (in bytes). This is needed to make the svr4 SDB debugger
130: happy. */
131:
132: #undef ASM_OUTPUT_FUNCTION_PREFIX
133: #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, FNNAME) \
134: do { ASM_OUTPUT_ALIGN (FILE, 2); \
135: fprintf ((FILE), "\t.long\t.ep."); \
136: assemble_name (FILE, FNNAME); \
137: fprintf (FILE, "-"); \
138: assemble_name (FILE, FNNAME); \
139: fprintf (FILE, "+0xc8000000\n"); \
140: current_function_original_name = (FNNAME); \
141: } while (0)
142:
143: /* Output the special label that must go just after each function's
144: prologue code to support svr4 SDB. */
145:
146: #define ASM_OUTPUT_PROLOGUE_SUFFIX(FILE) \
147: do { fprintf (FILE, ".ep."); \
148: assemble_name (FILE, current_function_original_name); \
149: fprintf (FILE, ":\n"); \
150: } while (0)
151:
1.1.1.4 ! root 152: /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
! 153:
! 154: Note that we want to give these sections the SHF_WRITE attribute
! 155: because these sections will actually contain data (i.e. tables of
! 156: addresses of functions in the current root executable or shared library
! 157: file) and, in the case of a shared library, the relocatable addresses
! 158: will have to be properly resolved/relocated (and then written into) by
! 159: the dynamic linker when it actually attaches the given shared library
! 160: to the executing process. (Note that on SVR4, you may wish to use the
! 161: `-z text' option to the ELF linker, when building a shared library, as
! 162: an additional check that you are doing everything right. But if you do
! 163: use the `-z text' option when building a shared library, you will get
! 164: errors unless the .ctors and .dtors sections are marked as writable
! 165: via the SHF_WRITE attribute.) */
! 166:
1.1 root 167: #undef CTORS_SECTION_ASM_OP
1.1.1.4 ! root 168: #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
1.1 root 169: #undef DTORS_SECTION_ASM_OP
1.1.1.4 ! root 170: #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
1.1 root 171:
172: /* Add definitions to support the .tdesc section as specified in the svr4
173: ABI for the i860. */
174:
175: #define TDESC_SECTION_ASM_OP ".section\t.tdesc"
176:
177: #undef EXTRA_SECTIONS
178: #define EXTRA_SECTIONS in_const, in_ctors, in_dtors, in_tdesc
179:
180: #undef EXTRA_SECTION_FUNCTIONS
181: #define EXTRA_SECTION_FUNCTIONS \
182: CONST_SECTION_FUNCTION \
183: CTORS_SECTION_FUNCTION \
184: DTORS_SECTION_FUNCTION \
185: TDESC_SECTION_FUNCTION
186:
187: #define TDESC_SECTION_FUNCTION \
188: void \
189: tdesc_section () \
190: { \
191: if (in_section != in_tdesc) \
192: { \
193: fprintf (asm_out_file, "%s\n", TDESC_SECTION_ASM_OP); \
194: in_section = in_tdesc; \
195: } \
196: }
197:
198: #ifdef OUTPUT_TDESC
199: #undef ASM_FILE_END
200: #define ASM_FILE_END(FILE) \
201: do { \
202: if (current_function_original_name != NULL) { \
203: tdesc_section(); \
204: fprintf ((FILE), "%s __ETEXT\n", ASM_LONG); \
205: fprintf ((FILE), "%s 0\n", ASM_LONG); \
206: text_section(); \
207: fputs("__ETEXT:\n", (FILE)); \
208: } \
209: fprintf ((FILE), "\t.ident\t\"GCC: (GNU) %s\"\n", \
210: version_string); \
211: } while (0)
212: #endif
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