[gcc.git] / gcc / config / i386 / linux.h

/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
   Copyright (C) 1994, 1995, 1996, 1997, 1998 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

#undef ASM_COMMENT_START
#define ASM_COMMENT_START "#"

/* 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, BODY, 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 (flag_pic)

/* 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 -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

/* Get perform_* macros to build libgcc.a.  */
#include "i386/perform.h"

/* 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) \
  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))
#endif
Commit	Line	Data
9ec36da5 JL	1	/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
9ec36da5 JL	2	Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
bb1835d2 RK	3	Contributed by Eric Youngdale.
bb1835d2 RK	4	Modified for stabs-in-ELF by H.J. Lu.
4a86a6d2 RK	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
97aadbb9 RK	20	the Free Software Foundation, 59 Temple Place - Suite 330,
97aadbb9 RK	21	Boston, MA 02111-1307, USA. */
1cf549b1	22
bb1835d2 RK	23	#define LINUX_DEFAULT_ELF
	24
	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. */
f17dfa93 RK	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 */
bb1835d2 RK	31
bb1835d2 RK	32	#undef TARGET_VERSION
c3b11311	33	#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
bb1835d2 RK	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
bebc4663 JL	40	#undef ASM_COMMENT_START
	41	#define ASM_COMMENT_START "#"
	42
bb1835d2 RK	43	/* This is how to output an element of a case-vector that is relative.
	44	This is only used for PIC code. See comments by the `casesi' insn in
	45	i386.md for an explanation of the expression this outputs. */
	46	#undef ASM_OUTPUT_ADDR_DIFF_ELT
33f7f353	47	#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
bb1835d2 RK	48	fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
	49
	50	/* Indicate that jump tables go in the text section. This is
	51	necessary when compiling PIC code. */
75197b37	52	#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
bb1835d2 RK	53
	54	/* Copy this from the svr4 specifications... */
	55	/* Define the register numbers to be used in Dwarf debugging information.
	56	The SVR4 reference port C compiler uses the following register numbers
	57	in its Dwarf output code:
	58	0 for %eax (gnu regno = 0)
	59	1 for %ecx (gnu regno = 2)
	60	2 for %edx (gnu regno = 1)
	61	3 for %ebx (gnu regno = 3)
	62	4 for %esp (gnu regno = 7)
	63	5 for %ebp (gnu regno = 6)
	64	6 for %esi (gnu regno = 4)
	65	7 for %edi (gnu regno = 5)
	66	The following three DWARF register numbers are never generated by
	67	the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
	68	believes these numbers have these meanings.
	69	8 for %eip (no gnu equivalent)
	70	9 for %eflags (no gnu equivalent)
	71	10 for %trapno (no gnu equivalent)
	72	It is not at all clear how we should number the FP stack registers
	73	for the x86 architecture. If the version of SDB on x86/svr4 were
	74	a bit less brain dead with respect to floating-point then we would
	75	have a precedent to follow with respect to DWARF register numbers
	76	for x86 FP registers, but the SDB on x86/svr4 is so completely
	77	broken with respect to FP registers that it is hardly worth thinking
	78	of it as something to strive for compatibility with.
ddd5a7c1	79	The version of x86/svr4 SDB I have at the moment does (partially)
bb1835d2 RK	80	seem to believe that DWARF register number 11 is associated with
	81	the x86 register %st(0), but that's about all. Higher DWARF
	82	register numbers don't seem to be associated with anything in
	83	particular, and even for DWARF regno 11, SDB only seems to under-
	84	stand that it should say that a variable lives in %st(0) (when
	85	asked via an `=' command) if we said it was in DWARF regno 11,
	86	but SDB still prints garbage when asked for the value of the
	87	variable in question (via a `/' command).
	88	(Also note that the labels SDB prints for various FP stack regs
	89	when doing an `x' command are all wrong.)
	90	Note that these problems generally don't affect the native SVR4
	91	C compiler because it doesn't allow the use of -O with -g and
	92	because when it is not optimizing, it allocates a memory
	93	location for each floating-point variable, and the memory
	94	location is what gets described in the DWARF AT_location
	95	attribute for the variable in question.
	96	Regardless of the severe mental illness of the x86/svr4 SDB, we
	97	do something sensible here and we use the following DWARF
	98	register numbers. Note that these are all stack-top-relative
	99	numbers.
	100	11 for %st(0) (gnu regno = 8)
	101	12 for %st(1) (gnu regno = 9)
	102	13 for %st(2) (gnu regno = 10)
	103	14 for %st(3) (gnu regno = 11)
	104	15 for %st(4) (gnu regno = 12)
	105	16 for %st(5) (gnu regno = 13)
	106	17 for %st(6) (gnu regno = 14)
	107	18 for %st(7) (gnu regno = 15)
	108	*/
	109	#undef DBX_REGISTER_NUMBER
	110	#define DBX_REGISTER_NUMBER(n) \
	111	((n) == 0 ? 0 \
	112	: (n) == 1 ? 2 \
	113	: (n) == 2 ? 1 \
	114	: (n) == 3 ? 3 \
	115	: (n) == 4 ? 6 \
	116	: (n) == 5 ? 7 \
	117	: (n) == 6 ? 5 \
	118	: (n) == 7 ? 4 \
	119	: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
	120	: (-1))
	121
	122	/* Output assembler code to FILE to increment profiler label # LABELNO
	123	for profiling a function entry. */
	124
	125	#undef FUNCTION_PROFILER
	126	#define FUNCTION_PROFILER(FILE, LABELNO) \
	127	{ \
	128	if (flag_pic) \
	129	{ \
	130	fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
	131	LPREFIX, (LABELNO)); \
	132	fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
	133	} \
	134	else \
	135	{ \
	136	fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
	137	fprintf (FILE, "\tcall mcount\n"); \
	138	} \
	139	}
d345a981	140
1cf549b1 RS	141	#undef SIZE_TYPE
1cf549b1 RS	142	#define SIZE_TYPE "unsigned int"
bb1835d2	143
1cf549b1 RS	144	#undef PTRDIFF_TYPE
1cf549b1 RS	145	#define PTRDIFF_TYPE "int"
bb1835d2	146
1cf549b1 RS	147	#undef WCHAR_TYPE
1cf549b1 RS	148	#define WCHAR_TYPE "long int"
bb1835d2	149
1cf549b1 RS	150	#undef WCHAR_TYPE_SIZE
1cf549b1 RS	151	#define WCHAR_TYPE_SIZE BITS_PER_WORD
bb1835d2 RK	152
bb1835d2 RK	153	#undef CPP_PREDEFINES
8524774e	154	#define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem(posix)"
1cf549b1	155
bb1835d2	156	#undef CPP_SPEC
5f62d4e1	157	#ifdef USE_GNULIBC_1
1228a9bd	158	#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
5f62d4e1	159	#else
1228a9bd	160	#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
5f62d4e1	161	#endif
1cf549b1	162
b52fbc26 RK	163	#undef CC1_SPEC
	164	#define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
	165
c3b11311	166	/* Provide a LINK_SPEC appropriate for Linux. Here we provide support
bb1835d2 RK	167	for the special GCC options -static and -shared, which allow us to
	168	link things in one of these three modes by applying the appropriate
	169	combinations of options at link-time. We like to support here for
	170	as many of the other GNU linker options as possible. But I don't
	171	have the time to search for those flags. I am sure how to add
	172	support for -soname shared_object_name. H.J.
	173
	174	I took out %{v:%{!V:-V}}. It is too much :-(. They can use
	175	-Wl,-V.
	176
	177	When the -shared link option is used a final link is not being
	178	done. */
	179
	180	/* If ELF is the default format, we should not use /lib/elf. */
	181
	182	#undef LINK_SPEC
5f62d4e1	183	#ifdef USE_GNULIBC_1
bb1835d2 RK	184	#ifndef LINUX_DEFAULT_ELF
	185	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	186	%{!shared: \
	187	%{!ibcs: \
	188	%{!static: \
	189	%{rdynamic:-export-dynamic} \
	190	%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
	191	%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
22cc53bc	192	#else
bb1835d2 RK	193	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	194	%{!shared: \
	195	%{!ibcs: \
	196	%{!static: \
	197	%{rdynamic:-export-dynamic} \
	198	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
	199	%{static:-static}}}"
22cc53bc	200	#endif
5f62d4e1 RK	201	#else
	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.2}} \
	208	%{static:-static}}}"
	209	#endif
6c2afd82 MM	210
	211	/* Get perform_* macros to build libgcc.a. */
	212	#include "i386/perform.h"
17d6fedc JM	213
17d6fedc JM	214	/* A C statement (sans semicolon) to output to the stdio stream
ca4fca3e	215	FILE the assembler definition of uninitialized global DECL named
17d6fedc JM	216	NAME whose size is SIZE bytes and alignment is ALIGN bytes.
	217	Try to use asm_output_aligned_bss to implement this macro. */
	218
ca4fca3e DE	219	#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
ca4fca3e DE	220	asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
de3eb7b7 L	221
	222	/* A C statement to output to the stdio stream FILE an assembler
	223	command to advance the location counter to a multiple of 1<<LOG
	224	bytes if it is within MAX_SKIP bytes.
	225
	226	This is used to align code labels according to Intel recommendations. */
	227
80de1662	228	#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
de3eb7b7 L	229	#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
	230	if ((LOG)!=0) \
	231	if ((MAX_SKIP)==0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
	232	else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP))
80de1662	233	#endif