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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 ! 154: #if TARGET_CPU_DEFAULT == 2 ! 155: #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}" ! 156: #else ! 157: #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}" 1.1 root 158: #endif 159: 1.1.1.4 ! root 160: #undef LIB_SPEC ! 161: #if 1 ! 162: /* We no longer link with libc_p.a or libg.a by default. If you ! 163: * want to profile or debug the Linux C library, please add ! 164: * -lc_p or -ggdb to LDFLAGS at the link time, respectively. ! 165: */ 1.1.1.3 root 166: #define LIB_SPEC \ 1.1.1.4 ! root 167: "%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \ ! 168: %{!ggdb:-lc} %{ggdb:-lg}}" ! 169: #else ! 170: #define LIB_SPEC \ ! 171: "%{!shared: \ ! 172: %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \ ! 173: %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}" ! 174: #endif ! 175: ! 176: /* Provide a LINK_SPEC appropriate for Linux. Here we provide support ! 177: for the special GCC options -static and -shared, which allow us to ! 178: link things in one of these three modes by applying the appropriate ! 179: combinations of options at link-time. We like to support here for ! 180: as many of the other GNU linker options as possible. But I don't ! 181: have the time to search for those flags. I am sure how to add ! 182: support for -soname shared_object_name. H.J. ! 183: ! 184: I took out %{v:%{!V:-V}}. It is too much :-(. They can use ! 185: -Wl,-V. ! 186: ! 187: When the -shared link option is used a final link is not being ! 188: done. */ ! 189: ! 190: /* If ELF is the default format, we should not use /lib/elf. */ ! 191: ! 192: #undef LINK_SPEC ! 193: #ifndef LINUX_DEFAULT_ELF ! 194: #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ ! 195: %{!shared: \ ! 196: %{!ibcs: \ ! 197: %{!static: \ ! 198: %{rdynamic:-export-dynamic} \ ! 199: %{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \ ! 200: %{!rpath:-rpath /lib/elf/}} %{static:-static}}}" 1.1 root 201: #else 1.1.1.4 ! root 202: #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ ! 203: %{!shared: \ ! 204: %{!ibcs: \ ! 205: %{!static: \ ! 206: %{rdynamic:-export-dynamic} \ ! 207: %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \ ! 208: %{static:-static}}}" 1.1 root 209: #endif 1.1.1.3 root 210: 211: /* Get perform_* macros to build libgcc.a. */ 212: #include "i386/perform.h"
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