1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002
Free Software Foundation, Inc.
Contributed by Eric Youngdale.
Modified for stabs-in-ELF by H.J. Lu.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define LINUX_DEFAULT_ELF
/* Output at beginning of assembler file. */
/* The .file command should always begin the output. */
#undef ASM_FILE_START
#define ASM_FILE_START(FILE) \
do { \
output_file_directive (FILE, main_input_filename); \
if (ix86_asm_dialect == ASM_INTEL) \
fputs ("\t.intel_syntax\n", FILE); \
} while (0)
#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
/* The svr4 ABI for the i386 says that records and unions are returned
in memory. */
#undef DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 1
#undef ASM_COMMENT_START
#define ASM_COMMENT_START "#"
#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) \
(TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
/* Output assembler code to FILE to call the profiler.
To the best of my knowledge, no Linux libc has required the label
argument to mcount. */
#define NO_PROFILE_COUNTERS
#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO) \
{ \
if (flag_pic) \
fprintf (FILE, "\tcall\t*mcount@GOT(%%ebx)\n"); \
else \
fprintf (FILE, "\tcall\tmcount\n"); \
}
/* True if it is possible to profile code that does not have a frame
pointer.
The GLIBC version of mcount for the x86 assumes that there is a
frame, so we cannot allow profiling without a frame pointer. */
#undef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER false
#undef SIZE_TYPE
#define SIZE_TYPE "unsigned int"
#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE "int"
#undef WCHAR_TYPE
#define WCHAR_TYPE "long int"
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE BITS_PER_WORD
#undef CPP_PREDEFINES
#define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem=posix"
#undef CPP_SPEC
#ifdef USE_GNULIBC_1
#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
#else
#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
#endif
#undef CC1_SPEC
#define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
/* Provide a LINK_SPEC appropriate for Linux. Here we provide support
for the special GCC options -static and -shared, which allow us to
link things in one of these three modes by applying the appropriate
combinations of options at link-time. We like to support here for
as many of the other GNU linker options as possible. But I don't
have the time to search for those flags. I am sure how to add
support for -soname shared_object_name. H.J.
I took out %{v:%{!V:-V}}. It is too much :-(. They can use
-Wl,-V.
When the -shared link option is used a final link is not being
done. */
/* If ELF is the default format, we should not use /lib/elf. */
#undef LINK_SPEC
#ifdef USE_GNULIBC_1
#ifndef LINUX_DEFAULT_ELF
#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
%{!shared: \
%{!ibcs: \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
#else
#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
%{!shared: \
%{!ibcs: \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
%{static:-static}}}"
#endif
#else
#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
%{!shared: \
%{!ibcs: \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
%{static:-static}}}"
#endif
/* A C statement (sans semicolon) to output to the stdio stream
FILE the assembler definition of uninitialized global DECL named
NAME whose size is SIZE bytes and alignment is ALIGN bytes.
Try to use asm_output_aligned_bss to implement this macro. */
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
/* A C statement to output to the stdio stream FILE an assembler
command to advance the location counter to a multiple of 1<<LOG
bytes if it is within MAX_SKIP bytes.
This is used to align code labels according to Intel recommendations. */
#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
do { \
if ((LOG) != 0) { \
if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
} \
} while (0)
#endif
#if defined(__PIC__) && defined (USE_GNULIBC_1)
/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
__environ and atexit. We have to make sure they are in the .dynsym
section. We do this by forcing the assembler to create undefined
references to these symbols in the object file. */
#undef CRT_CALL_STATIC_FUNCTION
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
asm (SECTION_OP "\n\t" \
"call " USER_LABEL_PREFIX #FUNC "\n" \
TEXT_SECTION_ASM_OP "\n\t" \
".extern ___brk_addr\n\t" \
".type ___brk_addr,@object\n\t" \
".extern __environ\n\t" \
".type __environ,@object\n\t" \
".extern atexit\n\t" \
".type atexit,@function");
#endif
/* Handle special EH pointer encodings. Absolute, pc-relative, and
indirect are handled automatically. */
#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
do { \
if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
{ \
fputs (ASM_LONG, FILE); \
assemble_name (FILE, XSTR (ADDR, 0)); \
fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
goto DONE; \
} \
} while (0)
/* Used by crtstuff.c to initialize the base of data-relative relocations.
These are GOT relative on x86, so return the pic register. */
#ifdef __PIC__
#define CRT_GET_RFIB_DATA(BASE) \
{ \
register void *ebx_ __asm__("ebx"); \
BASE = ebx_; \
}
#else
#define CRT_GET_RFIB_DATA(BASE) \
__asm__ ("call\t.LPR%=\n" \
".LPR%=:\n\t" \
"popl\t%0\n\t" \
/* Due to a GAS bug, this cannot use EAX. That encodes \
smaller than the traditional EBX, which results in the \
offset being off by one. */ \
"addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
: "=d"(BASE))
#endif
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
#ifdef IN_LIBGCC2
#include <signal.h>
#include <sys/ucontext.h>
#endif
#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
do { \
unsigned char *pc_ = (CONTEXT)->ra; \
struct sigcontext *sc_; \
long new_cfa_; \
\
/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \
if (*(unsigned short *)(pc_+0) == 0xb858 \
&& *(unsigned int *)(pc_+2) == 119 \
&& *(unsigned short *)(pc_+6) == 0x80cd) \
sc_ = (CONTEXT)->cfa + 4; \
/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \
else if (*(unsigned char *)(pc_+0) == 0xb8 \
&& *(unsigned int *)(pc_+1) == 173 \
&& *(unsigned short *)(pc_+5) == 0x80cd) \
{ \
struct rt_sigframe { \
int sig; \
struct siginfo *pinfo; \
void *puc; \
struct siginfo info; \
struct ucontext uc; \
} *rt_ = (CONTEXT)->cfa; \
sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \
} \
else \
break; \
\
new_cfa_ = sc_->esp; \
(FS)->cfa_how = CFA_REG_OFFSET; \
(FS)->cfa_reg = 4; \
(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
\
/* The SVR4 register numbering macros aren't usable in libgcc. */ \
(FS)->regs.reg[0].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \
(FS)->regs.reg[3].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \
(FS)->regs.reg[1].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \
(FS)->regs.reg[2].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \
(FS)->regs.reg[6].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \
(FS)->regs.reg[7].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \
(FS)->regs.reg[5].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \
(FS)->regs.reg[8].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \
(FS)->retaddr_column = 8; \
goto SUCCESS; \
} while (0)
|
