1/* Definitions for Intel 386 running FreeBSD with ELF format
2 Copyright (C) 1996, 2000, 2002, 2004 Free Software Foundation, Inc.
3 Contributed by Eric Youngdale.
4 Modified for stabs-in-ELF by H.J. Lu.
5 Adapted from GNU/Linux version by John Polstra.
6 Continued development by David O'Brien <obrien@freebsd.org>
7
8This file is part of GCC.
9
10GCC is free software; you can redistribute it and/or modify
11it under the terms of the GNU General Public License as published by
12the Free Software Foundation; either version 2, or (at your option)
13any later version.
14
15GCC is distributed in the hope that it will be useful,
16but WITHOUT ANY WARRANTY; without even the implied warranty of
17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18GNU General Public License for more details.
19
20You should have received a copy of the GNU General Public License
21along with GCC; see the file COPYING. If not, write to
22the Free Software Foundation, 51 Franklin Street, Fifth Floor,
23Boston, MA 02110-1301, USA. */
24
| 1/* Definitions for Intel 386 running FreeBSD with ELF format
2 Copyright (C) 1996, 2000, 2002, 2004 Free Software Foundation, Inc.
3 Contributed by Eric Youngdale.
4 Modified for stabs-in-ELF by H.J. Lu.
5 Adapted from GNU/Linux version by John Polstra.
6 Continued development by David O'Brien <obrien@freebsd.org>
7
8This file is part of GCC.
9
10GCC is free software; you can redistribute it and/or modify
11it under the terms of the GNU General Public License as published by
12the Free Software Foundation; either version 2, or (at your option)
13any later version.
14
15GCC is distributed in the hope that it will be useful,
16but WITHOUT ANY WARRANTY; without even the implied warranty of
17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18GNU General Public License for more details.
19
20You should have received a copy of the GNU General Public License
21along with GCC; see the file COPYING. If not, write to
22the Free Software Foundation, 51 Franklin Street, Fifth Floor,
23Boston, MA 02110-1301, USA. */
24
|
94/* Don't default to pcc-struct-return, we want to retain compatibility with
95 older gcc versions AND pcc-struct-return is nonreentrant.
96 (even though the SVR4 ABI for the i386 says that records and unions are
97 returned in memory). */
98
99#undef DEFAULT_PCC_STRUCT_RETURN
100#define DEFAULT_PCC_STRUCT_RETURN 0
101
102/* FreeBSD sets the rounding precision of the FPU to 53 bits. Let the
103 compiler get the contents of <float.h> and std::numeric_limits correct. */
104#undef TARGET_96_ROUND_53_LONG_DOUBLE
105#define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT)
106
107/* Tell final.c that we don't need a label passed to mcount. */
108#define NO_PROFILE_COUNTERS 1
109
110/* Output assembler code to FILE to begin profiling of the current function.
111 LABELNO is an optional label. */
112
113#undef MCOUNT_NAME
114#define MCOUNT_NAME ".mcount"
115
116/* Output assembler code to FILE to end profiling of the current function. */
117
118#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */
119
120
121/************************[ Assembler stuff ]********************************/
122
123/* Override the default comment-starter of "/" from unix.h. */
124#undef ASM_COMMENT_START
125#define ASM_COMMENT_START "#"
126
127/* Override the default comment-starter of "/APP" from unix.h. */
128#undef ASM_APP_ON
129#define ASM_APP_ON "#APP\n"
130#undef ASM_APP_OFF
131#define ASM_APP_OFF "#NO_APP\n"
132
133/* XXX:DEO do we still need this override to defaults.h ?? */
134/* This is how to output a reference to a user-level label named NAME. */
135#undef ASM_OUTPUT_LABELREF
136#define ASM_OUTPUT_LABELREF(FILE, NAME) \
137 do { \
138 const char *xname = (NAME); \
139 /* Hack to avoid writing lots of rtl in \
140 FUNCTION_PROFILER_EPILOGUE (). */ \
141 if (*xname == '.' && strcmp(xname + 1, "mexitcount") == 0) \
142 { \
143 if (flag_pic) \
144 fprintf ((FILE), "*%s@GOT(%%ebx)", xname); \
145 else \
146 fprintf ((FILE), "%s", xname); \
147 } \
148 else \
149 { \
150 if (xname[0] == '%') \
151 xname += 2; \
152 if (xname[0] == '*') \
153 xname += 1; \
154 else \
155 fputs (user_label_prefix, FILE); \
156 fputs (xname, FILE); \
157 } \
158} while (0)
159
160/* This is how to hack on the symbol code of certain relcalcitrant
161 symbols to modify their output in output_pic_addr_const (). */
162
163#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */
164
165/* A C statement to output to the stdio stream FILE an assembler
166 command to advance the location counter to a multiple of 1<<LOG
167 bytes if it is within MAX_SKIP bytes.
168
169 This is used to align code labels according to Intel recommendations. */
170
171/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE,
172 but it is easier to fix in an MD way. */
173
174#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
175#undef ASM_OUTPUT_MAX_SKIP_ALIGN
176#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \
177 do { \
178 if ((LOG) != 0) { \
179 if ((MAX_SKIP) == 0) \
180 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
181 else \
182 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
183 } \
184 } while (0)
185#endif
186
187/* If defined, a C expression whose value is a string containing the
188 assembler operation to identify the following data as
189 uninitialized global data. If not defined, and neither
190 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
191 uninitialized global data will be output in the data section if
192 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
193 used. */
194#undef BSS_SECTION_ASM_OP
195#define BSS_SECTION_ASM_OP "\t.section\t.bss"
196
197/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
198 separate, explicit argument. If you define this macro, it is used
199 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
200 handling the required alignment of the variable. The alignment is
201 specified as the number of bits.
202
203 Try to use function `asm_output_aligned_bss' defined in file
204 `varasm.c' when defining this macro. */
205#undef ASM_OUTPUT_ALIGNED_BSS
206#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
207 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
208
209/************************[ Debugger stuff ]*********************************/
210
211#undef DBX_REGISTER_NUMBER
212#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \
213 : (write_symbols == DWARF2_DEBUG) \
214 ? svr4_dbx_register_map[(n)] \
215 : dbx_register_map[(n)])
216
217/* The same functions are used to creating the DWARF2 debug info and C++
218 unwind info (except.c). Regardless of the debug format requested, the
219 register numbers used in exception unwinding sections still have to be
220 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER
221 macro to mean too much. */
222#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \
223 : svr4_dbx_register_map[(n)])
224
225/* stabs-in-elf has offsets relative to function beginning */
226#undef DBX_OUTPUT_LBRAC
227#define DBX_OUTPUT_LBRAC(FILE, NAME) \
228 do { \
229 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \
230 assemble_name (asm_out_file, NAME); \
231 fputc ('-', asm_out_file); \
232 assemble_name (asm_out_file, \
233 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
234 fprintf (asm_out_file, "\n"); \
235 } while (0)
236
237#undef DBX_OUTPUT_RBRAC
238#define DBX_OUTPUT_RBRAC(FILE, NAME) \
239 do { \
240 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \
241 assemble_name (asm_out_file, NAME); \
242 fputc ('-', asm_out_file); \
243 assemble_name (asm_out_file, \
244 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
245 fprintf (asm_out_file, "\n"); \
246 } while (0)
| 89/* Don't default to pcc-struct-return, we want to retain compatibility with
90 older gcc versions AND pcc-struct-return is nonreentrant.
91 (even though the SVR4 ABI for the i386 says that records and unions are
92 returned in memory). */
93
94#undef DEFAULT_PCC_STRUCT_RETURN
95#define DEFAULT_PCC_STRUCT_RETURN 0
96
97/* FreeBSD sets the rounding precision of the FPU to 53 bits. Let the
98 compiler get the contents of <float.h> and std::numeric_limits correct. */
99#undef TARGET_96_ROUND_53_LONG_DOUBLE
100#define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT)
101
102/* Tell final.c that we don't need a label passed to mcount. */
103#define NO_PROFILE_COUNTERS 1
104
105/* Output assembler code to FILE to begin profiling of the current function.
106 LABELNO is an optional label. */
107
108#undef MCOUNT_NAME
109#define MCOUNT_NAME ".mcount"
110
111/* Output assembler code to FILE to end profiling of the current function. */
112
113#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */
114
115
116/************************[ Assembler stuff ]********************************/
117
118/* Override the default comment-starter of "/" from unix.h. */
119#undef ASM_COMMENT_START
120#define ASM_COMMENT_START "#"
121
122/* Override the default comment-starter of "/APP" from unix.h. */
123#undef ASM_APP_ON
124#define ASM_APP_ON "#APP\n"
125#undef ASM_APP_OFF
126#define ASM_APP_OFF "#NO_APP\n"
127
128/* XXX:DEO do we still need this override to defaults.h ?? */
129/* This is how to output a reference to a user-level label named NAME. */
130#undef ASM_OUTPUT_LABELREF
131#define ASM_OUTPUT_LABELREF(FILE, NAME) \
132 do { \
133 const char *xname = (NAME); \
134 /* Hack to avoid writing lots of rtl in \
135 FUNCTION_PROFILER_EPILOGUE (). */ \
136 if (*xname == '.' && strcmp(xname + 1, "mexitcount") == 0) \
137 { \
138 if (flag_pic) \
139 fprintf ((FILE), "*%s@GOT(%%ebx)", xname); \
140 else \
141 fprintf ((FILE), "%s", xname); \
142 } \
143 else \
144 { \
145 if (xname[0] == '%') \
146 xname += 2; \
147 if (xname[0] == '*') \
148 xname += 1; \
149 else \
150 fputs (user_label_prefix, FILE); \
151 fputs (xname, FILE); \
152 } \
153} while (0)
154
155/* This is how to hack on the symbol code of certain relcalcitrant
156 symbols to modify their output in output_pic_addr_const (). */
157
158#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */
159
160/* A C statement to output to the stdio stream FILE an assembler
161 command to advance the location counter to a multiple of 1<<LOG
162 bytes if it is within MAX_SKIP bytes.
163
164 This is used to align code labels according to Intel recommendations. */
165
166/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE,
167 but it is easier to fix in an MD way. */
168
169#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
170#undef ASM_OUTPUT_MAX_SKIP_ALIGN
171#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \
172 do { \
173 if ((LOG) != 0) { \
174 if ((MAX_SKIP) == 0) \
175 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
176 else \
177 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
178 } \
179 } while (0)
180#endif
181
182/* If defined, a C expression whose value is a string containing the
183 assembler operation to identify the following data as
184 uninitialized global data. If not defined, and neither
185 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
186 uninitialized global data will be output in the data section if
187 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
188 used. */
189#undef BSS_SECTION_ASM_OP
190#define BSS_SECTION_ASM_OP "\t.section\t.bss"
191
192/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
193 separate, explicit argument. If you define this macro, it is used
194 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
195 handling the required alignment of the variable. The alignment is
196 specified as the number of bits.
197
198 Try to use function `asm_output_aligned_bss' defined in file
199 `varasm.c' when defining this macro. */
200#undef ASM_OUTPUT_ALIGNED_BSS
201#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
202 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
203
204/************************[ Debugger stuff ]*********************************/
205
206#undef DBX_REGISTER_NUMBER
207#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \
208 : (write_symbols == DWARF2_DEBUG) \
209 ? svr4_dbx_register_map[(n)] \
210 : dbx_register_map[(n)])
211
212/* The same functions are used to creating the DWARF2 debug info and C++
213 unwind info (except.c). Regardless of the debug format requested, the
214 register numbers used in exception unwinding sections still have to be
215 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER
216 macro to mean too much. */
217#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \
218 : svr4_dbx_register_map[(n)])
219
220/* stabs-in-elf has offsets relative to function beginning */
221#undef DBX_OUTPUT_LBRAC
222#define DBX_OUTPUT_LBRAC(FILE, NAME) \
223 do { \
224 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \
225 assemble_name (asm_out_file, NAME); \
226 fputc ('-', asm_out_file); \
227 assemble_name (asm_out_file, \
228 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
229 fprintf (asm_out_file, "\n"); \
230 } while (0)
231
232#undef DBX_OUTPUT_RBRAC
233#define DBX_OUTPUT_RBRAC(FILE, NAME) \
234 do { \
235 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \
236 assemble_name (asm_out_file, NAME); \
237 fputc ('-', asm_out_file); \
238 assemble_name (asm_out_file, \
239 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
240 fprintf (asm_out_file, "\n"); \
241 } while (0)
|