a4cd5630b0
non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code.
213 lines
7.8 KiB
C
213 lines
7.8 KiB
C
/* Definitions for Intel 386 running Linux with ELF format
|
|
Copyright (C) 1994, 1995 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
|
|
|
|
/* A lie, I guess, but the general idea behind linux/ELF is that we are
|
|
supposed to be outputting something that will assemble under SVr4.
|
|
This gets us pretty close. */
|
|
#include <i386/i386.h> /* Base i386 target machine definitions */
|
|
#include <i386/att.h> /* Use the i386 AT&T assembler syntax */
|
|
#include <linux.h> /* some common stuff */
|
|
|
|
#undef TARGET_VERSION
|
|
#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
|
|
|
|
/* This is how to output an element of a case-vector that is relative.
|
|
This is only used for PIC code. See comments by the `casesi' insn in
|
|
i386.md for an explanation of the expression this outputs. */
|
|
#undef ASM_OUTPUT_ADDR_DIFF_ELT
|
|
#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
|
|
fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
|
|
|
|
/* Indicate that jump tables go in the text section. This is
|
|
necessary when compiling PIC code. */
|
|
#define JUMP_TABLES_IN_TEXT_SECTION
|
|
|
|
/* Copy this from the svr4 specifications... */
|
|
/* Define the register numbers to be used in Dwarf debugging information.
|
|
The SVR4 reference port C compiler uses the following register numbers
|
|
in its Dwarf output code:
|
|
0 for %eax (gnu regno = 0)
|
|
1 for %ecx (gnu regno = 2)
|
|
2 for %edx (gnu regno = 1)
|
|
3 for %ebx (gnu regno = 3)
|
|
4 for %esp (gnu regno = 7)
|
|
5 for %ebp (gnu regno = 6)
|
|
6 for %esi (gnu regno = 4)
|
|
7 for %edi (gnu regno = 5)
|
|
The following three DWARF register numbers are never generated by
|
|
the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
|
|
believes these numbers have these meanings.
|
|
8 for %eip (no gnu equivalent)
|
|
9 for %eflags (no gnu equivalent)
|
|
10 for %trapno (no gnu equivalent)
|
|
It is not at all clear how we should number the FP stack registers
|
|
for the x86 architecture. If the version of SDB on x86/svr4 were
|
|
a bit less brain dead with respect to floating-point then we would
|
|
have a precedent to follow with respect to DWARF register numbers
|
|
for x86 FP registers, but the SDB on x86/svr4 is so completely
|
|
broken with respect to FP registers that it is hardly worth thinking
|
|
of it as something to strive for compatibility with.
|
|
The version of x86/svr4 SDB I have at the moment does (partially)
|
|
seem to believe that DWARF register number 11 is associated with
|
|
the x86 register %st(0), but that's about all. Higher DWARF
|
|
register numbers don't seem to be associated with anything in
|
|
particular, and even for DWARF regno 11, SDB only seems to under-
|
|
stand that it should say that a variable lives in %st(0) (when
|
|
asked via an `=' command) if we said it was in DWARF regno 11,
|
|
but SDB still prints garbage when asked for the value of the
|
|
variable in question (via a `/' command).
|
|
(Also note that the labels SDB prints for various FP stack regs
|
|
when doing an `x' command are all wrong.)
|
|
Note that these problems generally don't affect the native SVR4
|
|
C compiler because it doesn't allow the use of -O with -g and
|
|
because when it is *not* optimizing, it allocates a memory
|
|
location for each floating-point variable, and the memory
|
|
location is what gets described in the DWARF AT_location
|
|
attribute for the variable in question.
|
|
Regardless of the severe mental illness of the x86/svr4 SDB, we
|
|
do something sensible here and we use the following DWARF
|
|
register numbers. Note that these are all stack-top-relative
|
|
numbers.
|
|
11 for %st(0) (gnu regno = 8)
|
|
12 for %st(1) (gnu regno = 9)
|
|
13 for %st(2) (gnu regno = 10)
|
|
14 for %st(3) (gnu regno = 11)
|
|
15 for %st(4) (gnu regno = 12)
|
|
16 for %st(5) (gnu regno = 13)
|
|
17 for %st(6) (gnu regno = 14)
|
|
18 for %st(7) (gnu regno = 15)
|
|
*/
|
|
#undef DBX_REGISTER_NUMBER
|
|
#define DBX_REGISTER_NUMBER(n) \
|
|
((n) == 0 ? 0 \
|
|
: (n) == 1 ? 2 \
|
|
: (n) == 2 ? 1 \
|
|
: (n) == 3 ? 3 \
|
|
: (n) == 4 ? 6 \
|
|
: (n) == 5 ? 7 \
|
|
: (n) == 6 ? 5 \
|
|
: (n) == 7 ? 4 \
|
|
: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
|
|
: (-1))
|
|
|
|
/* Output assembler code to FILE to increment profiler label # LABELNO
|
|
for profiling a function entry. */
|
|
|
|
#undef FUNCTION_PROFILER
|
|
#define FUNCTION_PROFILER(FILE, LABELNO) \
|
|
{ \
|
|
if (flag_pic) \
|
|
{ \
|
|
fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
|
|
LPREFIX, (LABELNO)); \
|
|
fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
|
|
} \
|
|
else \
|
|
{ \
|
|
fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
|
|
fprintf (FILE, "\tcall mcount\n"); \
|
|
} \
|
|
}
|
|
|
|
#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 -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)"
|
|
|
|
#undef CPP_SPEC
|
|
#if TARGET_CPU_DEFAULT == 2
|
|
#define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}"
|
|
#else
|
|
#define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
|
|
#endif
|
|
|
|
#undef LIB_SPEC
|
|
#if 1
|
|
/* We no longer link with libc_p.a or libg.a by default. If you
|
|
* want to profile or debug the Linux C library, please add
|
|
* -lc_p or -ggdb to LDFLAGS at the link time, respectively.
|
|
*/
|
|
#define LIB_SPEC \
|
|
"%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
|
|
%{!ggdb:-lc} %{ggdb:-lg}}"
|
|
#else
|
|
#define LIB_SPEC \
|
|
"%{!shared: \
|
|
%{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
|
|
%{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}"
|
|
#endif
|
|
|
|
/* 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
|
|
#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
|
|
|
|
/* Get perform_* macros to build libgcc.a. */
|
|
#include "i386/perform.h"
|