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1.1.1.4 root 1: /* Definitions for Intel 386 running Linux with ELF format
2: Copyright (C) 1994, 1995 Free Software Foundation, Inc.
3: Contributed by Eric Youngdale.
4: Modified for stabs-in-ELF by H.J. Lu.
1.1.1.3 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:
1.1.1.4 root 23: #define LINUX_DEFAULT_ELF
1.1 root 24:
1.1.1.4 root 25: /* A lie, I guess, but the general idea behind linux/ELF is that we are
26: supposed to be outputting something that will assemble under SVr4.
27: This gets us pretty close. */
28: #include <i386/i386.h> /* Base i386 target machine definitions */
29: #include <i386/att.h> /* Use the i386 AT&T assembler syntax */
30: #include <linux.h> /* some common stuff */
31:
32: #undef TARGET_VERSION
33: #define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
34:
35: /* The svr4 ABI for the i386 says that records and unions are returned
36: in memory. */
37: #undef DEFAULT_PCC_STRUCT_RETURN
38: #define DEFAULT_PCC_STRUCT_RETURN 1
39:
40: /* This is how to output an element of a case-vector that is relative.
41: This is only used for PIC code. See comments by the `casesi' insn in
42: i386.md for an explanation of the expression this outputs. */
43: #undef ASM_OUTPUT_ADDR_DIFF_ELT
44: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
45: fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
46:
47: /* Indicate that jump tables go in the text section. This is
48: necessary when compiling PIC code. */
49: #define JUMP_TABLES_IN_TEXT_SECTION
50:
51: /* Copy this from the svr4 specifications... */
52: /* Define the register numbers to be used in Dwarf debugging information.
53: The SVR4 reference port C compiler uses the following register numbers
54: in its Dwarf output code:
55: 0 for %eax (gnu regno = 0)
56: 1 for %ecx (gnu regno = 2)
57: 2 for %edx (gnu regno = 1)
58: 3 for %ebx (gnu regno = 3)
59: 4 for %esp (gnu regno = 7)
60: 5 for %ebp (gnu regno = 6)
61: 6 for %esi (gnu regno = 4)
62: 7 for %edi (gnu regno = 5)
63: The following three DWARF register numbers are never generated by
64: the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
65: believes these numbers have these meanings.
66: 8 for %eip (no gnu equivalent)
67: 9 for %eflags (no gnu equivalent)
68: 10 for %trapno (no gnu equivalent)
69: It is not at all clear how we should number the FP stack registers
70: for the x86 architecture. If the version of SDB on x86/svr4 were
71: a bit less brain dead with respect to floating-point then we would
72: have a precedent to follow with respect to DWARF register numbers
73: for x86 FP registers, but the SDB on x86/svr4 is so completely
74: broken with respect to FP registers that it is hardly worth thinking
75: of it as something to strive for compatibility with.
76: The version of x86/svr4 SDB I have at the moment does (partially)
77: seem to believe that DWARF register number 11 is associated with
78: the x86 register %st(0), but that's about all. Higher DWARF
79: register numbers don't seem to be associated with anything in
80: particular, and even for DWARF regno 11, SDB only seems to under-
81: stand that it should say that a variable lives in %st(0) (when
82: asked via an `=' command) if we said it was in DWARF regno 11,
83: but SDB still prints garbage when asked for the value of the
84: variable in question (via a `/' command).
85: (Also note that the labels SDB prints for various FP stack regs
86: when doing an `x' command are all wrong.)
87: Note that these problems generally don't affect the native SVR4
88: C compiler because it doesn't allow the use of -O with -g and
89: because when it is *not* optimizing, it allocates a memory
90: location for each floating-point variable, and the memory
91: location is what gets described in the DWARF AT_location
92: attribute for the variable in question.
93: Regardless of the severe mental illness of the x86/svr4 SDB, we
94: do something sensible here and we use the following DWARF
95: register numbers. Note that these are all stack-top-relative
96: numbers.
97: 11 for %st(0) (gnu regno = 8)
98: 12 for %st(1) (gnu regno = 9)
99: 13 for %st(2) (gnu regno = 10)
100: 14 for %st(3) (gnu regno = 11)
101: 15 for %st(4) (gnu regno = 12)
102: 16 for %st(5) (gnu regno = 13)
103: 17 for %st(6) (gnu regno = 14)
104: 18 for %st(7) (gnu regno = 15)
105: */
106: #undef DBX_REGISTER_NUMBER
107: #define DBX_REGISTER_NUMBER(n) \
108: ((n) == 0 ? 0 \
109: : (n) == 1 ? 2 \
110: : (n) == 2 ? 1 \
111: : (n) == 3 ? 3 \
112: : (n) == 4 ? 6 \
113: : (n) == 5 ? 7 \
114: : (n) == 6 ? 5 \
115: : (n) == 7 ? 4 \
116: : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
117: : (-1))
118:
119: /* Output assembler code to FILE to increment profiler label # LABELNO
120: for profiling a function entry. */
121:
122: #undef FUNCTION_PROFILER
123: #define FUNCTION_PROFILER(FILE, LABELNO) \
124: { \
125: if (flag_pic) \
126: { \
127: fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
128: LPREFIX, (LABELNO)); \
129: fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
130: } \
131: else \
132: { \
133: fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
134: fprintf (FILE, "\tcall mcount\n"); \
135: } \
136: }
1.1 root 137:
138: #undef SIZE_TYPE
139: #define SIZE_TYPE "unsigned int"
1.1.1.4 root 140:
1.1 root 141: #undef PTRDIFF_TYPE
142: #define PTRDIFF_TYPE "int"
1.1.1.4 root 143:
1.1 root 144: #undef WCHAR_TYPE
145: #define WCHAR_TYPE "long int"
1.1.1.4 root 146:
1.1 root 147: #undef WCHAR_TYPE_SIZE
148: #define WCHAR_TYPE_SIZE BITS_PER_WORD
1.1.1.4 root 149:
150: #undef CPP_PREDEFINES
151: #define CPP_PREDEFINES "-D__ELF__ -Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)"
1.1 root 152:
1.1.1.4 root 153: #undef CPP_SPEC
1.1.1.6 ! root 154: #ifdef USE_GNULIBC_1
1.1.1.4 root 155: #if TARGET_CPU_DEFAULT == 2
156: #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}"
157: #else
158: #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
1.1 root 159: #endif
1.1.1.6 ! root 160: #else /* not USE_GNULIBC_1 */
1.1.1.5 root 161: #define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
1.1.1.6 ! root 162: #endif /* not USE_GNULIBC_1 */
! 163:
! 164: #undef LIBGCC_SPEC
! 165: #define LIBGCC_SPEC "-lgcc"
1.1 root 166:
1.1.1.4 root 167: #undef LIB_SPEC
1.1.1.6 ! root 168: #ifdef USE_GNULIBC_1
1.1.1.4 root 169: #if 1
170: /* We no longer link with libc_p.a or libg.a by default. If you
171: * want to profile or debug the Linux C library, please add
172: * -lc_p or -ggdb to LDFLAGS at the link time, respectively.
173: */
1.1.1.3 root 174: #define LIB_SPEC \
1.1.1.4 root 175: "%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
176: %{!ggdb:-lc} %{ggdb:-lg}}"
177: #else
178: #define LIB_SPEC \
179: "%{!shared: \
180: %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
181: %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}"
182: #endif
1.1.1.6 ! root 183: #else
! 184: #define LIB_SPEC \
! 185: "%{!shared: %{mieee-fp:-lieee} %{pthread:-lpthread} \
! 186: %{profile:-lc_p} %{!profile: -lc}}"
! 187: #endif /* not USE_GNULIBC_1 */
1.1.1.4 root 188:
189: /* Provide a LINK_SPEC appropriate for Linux. Here we provide support
190: for the special GCC options -static and -shared, which allow us to
191: link things in one of these three modes by applying the appropriate
192: combinations of options at link-time. We like to support here for
193: as many of the other GNU linker options as possible. But I don't
194: have the time to search for those flags. I am sure how to add
195: support for -soname shared_object_name. H.J.
196:
197: I took out %{v:%{!V:-V}}. It is too much :-(. They can use
198: -Wl,-V.
199:
200: When the -shared link option is used a final link is not being
201: done. */
202:
203: /* If ELF is the default format, we should not use /lib/elf. */
204:
205: #undef LINK_SPEC
1.1.1.6 ! root 206: #ifdef USE_GNULIBC_1
1.1.1.4 root 207: #ifndef LINUX_DEFAULT_ELF
208: #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
209: %{!shared: \
210: %{!ibcs: \
211: %{!static: \
212: %{rdynamic:-export-dynamic} \
213: %{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
214: %{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
1.1 root 215: #else
1.1.1.4 root 216: #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
217: %{!shared: \
218: %{!ibcs: \
219: %{!static: \
220: %{rdynamic:-export-dynamic} \
221: %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
222: %{static:-static}}}"
1.1 root 223: #endif
1.1.1.6 ! root 224: #else /* not USE_GNULIBC_1 */
1.1.1.5 root 225: #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
226: %{!shared: \
227: %{!ibcs: \
228: %{!static: \
229: %{rdynamic:-export-dynamic} \
230: %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
231: %{static:-static}}}"
1.1.1.6 ! root 232: #endif /* not USE_GNULIBC_1 */
1.1.1.3 root 233:
234: /* Get perform_* macros to build libgcc.a. */
235: #include "i386/perform.h"
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