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218 lines
8.0 KiB
C
218 lines
8.0 KiB
C
/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
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Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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Contributed by Eric Youngdale.
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Modified for stabs-in-ELF by H.J. Lu.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define LINUX_DEFAULT_ELF
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/* A lie, I guess, but the general idea behind linux/ELF is that we are
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supposed to be outputting something that will assemble under SVr4.
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This gets us pretty close. */
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#include <i386/i386.h> /* Base i386 target machine definitions */
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#include <i386/att.h> /* Use the i386 AT&T assembler syntax */
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#include <linux.h> /* some common stuff */
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#undef TARGET_VERSION
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#define TARGET_VERSION fprintf (stderr, " (i386 GNU/Linux with ELF)");
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/* The svr4 ABI for the i386 says that records and unions are returned
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in memory. */
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#undef DEFAULT_PCC_STRUCT_RETURN
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#define DEFAULT_PCC_STRUCT_RETURN 1
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/* This is how to output an element of a case-vector that is relative.
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This is only used for PIC code. See comments by the `casesi' insn in
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i386.md for an explanation of the expression this outputs. */
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#undef ASM_OUTPUT_ADDR_DIFF_ELT
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#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
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fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
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/* Indicate that jump tables go in the text section. This is
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necessary when compiling PIC code. */
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#define JUMP_TABLES_IN_TEXT_SECTION
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/* Copy this from the svr4 specifications... */
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/* Define the register numbers to be used in Dwarf debugging information.
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The SVR4 reference port C compiler uses the following register numbers
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in its Dwarf output code:
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0 for %eax (gnu regno = 0)
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1 for %ecx (gnu regno = 2)
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2 for %edx (gnu regno = 1)
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3 for %ebx (gnu regno = 3)
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4 for %esp (gnu regno = 7)
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5 for %ebp (gnu regno = 6)
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6 for %esi (gnu regno = 4)
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7 for %edi (gnu regno = 5)
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The following three DWARF register numbers are never generated by
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the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
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believes these numbers have these meanings.
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8 for %eip (no gnu equivalent)
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9 for %eflags (no gnu equivalent)
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10 for %trapno (no gnu equivalent)
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It is not at all clear how we should number the FP stack registers
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for the x86 architecture. If the version of SDB on x86/svr4 were
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a bit less brain dead with respect to floating-point then we would
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have a precedent to follow with respect to DWARF register numbers
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for x86 FP registers, but the SDB on x86/svr4 is so completely
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broken with respect to FP registers that it is hardly worth thinking
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of it as something to strive for compatibility with.
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The version of x86/svr4 SDB I have at the moment does (partially)
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seem to believe that DWARF register number 11 is associated with
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the x86 register %st(0), but that's about all. Higher DWARF
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register numbers don't seem to be associated with anything in
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particular, and even for DWARF regno 11, SDB only seems to under-
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stand that it should say that a variable lives in %st(0) (when
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asked via an `=' command) if we said it was in DWARF regno 11,
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but SDB still prints garbage when asked for the value of the
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variable in question (via a `/' command).
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(Also note that the labels SDB prints for various FP stack regs
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when doing an `x' command are all wrong.)
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Note that these problems generally don't affect the native SVR4
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C compiler because it doesn't allow the use of -O with -g and
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because when it is *not* optimizing, it allocates a memory
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location for each floating-point variable, and the memory
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location is what gets described in the DWARF AT_location
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attribute for the variable in question.
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Regardless of the severe mental illness of the x86/svr4 SDB, we
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do something sensible here and we use the following DWARF
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register numbers. Note that these are all stack-top-relative
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numbers.
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11 for %st(0) (gnu regno = 8)
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12 for %st(1) (gnu regno = 9)
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13 for %st(2) (gnu regno = 10)
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14 for %st(3) (gnu regno = 11)
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15 for %st(4) (gnu regno = 12)
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16 for %st(5) (gnu regno = 13)
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17 for %st(6) (gnu regno = 14)
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18 for %st(7) (gnu regno = 15)
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*/
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#undef DBX_REGISTER_NUMBER
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#define DBX_REGISTER_NUMBER(n) \
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((n) == 0 ? 0 \
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: (n) == 1 ? 2 \
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: (n) == 2 ? 1 \
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: (n) == 3 ? 3 \
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: (n) == 4 ? 6 \
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: (n) == 5 ? 7 \
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: (n) == 6 ? 5 \
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: (n) == 7 ? 4 \
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: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
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: (-1))
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/* Output assembler code to FILE to increment profiler label # LABELNO
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for profiling a function entry. */
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#undef FUNCTION_PROFILER
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#define FUNCTION_PROFILER(FILE, LABELNO) \
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{ \
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if (flag_pic) \
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{ \
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fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
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LPREFIX, (LABELNO)); \
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fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
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} \
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else \
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{ \
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fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
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fprintf (FILE, "\tcall mcount\n"); \
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} \
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}
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#undef SIZE_TYPE
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#define SIZE_TYPE "unsigned int"
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE "int"
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#undef WCHAR_TYPE
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#define WCHAR_TYPE "long int"
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE BITS_PER_WORD
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#undef CPP_PREDEFINES
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#define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem(posix)"
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#undef CPP_SPEC
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#ifdef USE_GNULIBC_1
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#define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
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#else
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#define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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#endif
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#undef CC1_SPEC
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#define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
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/* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support
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for the special GCC options -static and -shared, which allow us to
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link things in one of these three modes by applying the appropriate
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combinations of options at link-time. We like to support here for
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as many of the other GNU linker options as possible. But I don't
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have the time to search for those flags. I am sure how to add
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support for -soname shared_object_name. H.J.
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I took out %{v:%{!V:-V}}. It is too much :-(. They can use
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-Wl,-V.
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When the -shared link option is used a final link is not being
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done. */
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/* If ELF is the default format, we should not use /lib/elf. */
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#undef LINK_SPEC
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#ifdef USE_GNULIBC_1
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#ifndef LINUX_DEFAULT_ELF
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#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
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%{!shared: \
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%{!ibcs: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
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%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
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#else
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#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
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%{!shared: \
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%{!ibcs: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
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%{static:-static}}}"
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#endif
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#else
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#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
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%{!shared: \
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%{!ibcs: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
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%{static:-static}}}"
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#endif
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/* Get perform_* macros to build libgcc.a. */
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#include "i386/perform.h"
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/* A C statement (sans semicolon) to output to the stdio stream
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FILE the assembler definition of uninitialized global DECL named
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NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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Try to use asm_output_aligned_bss to implement this macro. */
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#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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