[thirdparty/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, 1999, 2001, 2002
   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

/* Output at beginning of assembler file.  */
/* The .file command should always begin the output.  */
#undef ASM_FILE_START
#define ASM_FILE_START(FILE)						\
  do {									\
	output_file_directive (FILE, main_input_filename);		\
	if (ix86_asm_dialect == ASM_INTEL)				\
	  fputs ("\t.intel_syntax\n", FILE);				\
  } while (0)

#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 "#"

#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) \
  (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])

/* Output assembler code to FILE to call the profiler.
   To the best of my knowledge, no Linux libc has required the label
   argument to mcount.  */

#define NO_PROFILE_COUNTERS

#undef MCOUNT_NAME
#define MCOUNT_NAME "mcount"

/* The GLIBC version of mcount for the x86 assumes that there is a
   frame, so we cannot allow profiling without a frame pointer.  */

#undef SUBTARGET_FRAME_POINTER_REQUIRED
#define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile

#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
    
#define TARGET_OS_CPP_BUILTINS()		\
  do						\
    {						\
	builtin_define_std ("linux");		\
	builtin_define_std ("unix");		\
	builtin_define ("__ELF__");		\
	builtin_define ("__gnu_linux__");	\
	builtin_assert ("system=posix");	\
	if (flag_pic)				\
	  {					\
	    builtin_define ("__PIC__");		\
	    builtin_define ("__pic__");		\
	  }					\
    }						\
  while (0)

#undef CPP_SPEC
#ifdef USE_GNULIBC_1
#define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
#else
#define CPP_SPEC "%{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

/* 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)			\
  do {									\
    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));	\
    }									\
  } while (0)
#endif

#if defined(__PIC__) && defined (USE_GNULIBC_1)
/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
   __environ and atexit.  We have to make sure they are in the .dynsym
   section.  We do this by forcing the assembler to create undefined 
   references to these symbols in the object file.  */
#undef CRT_CALL_STATIC_FUNCTION
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)	\
   asm (SECTION_OP "\n\t"				\
	"call " USER_LABEL_PREFIX #FUNC "\n"		\
	TEXT_SECTION_ASM_OP "\n\t"			\
	".extern ___brk_addr\n\t"			\
	".type ___brk_addr,@object\n\t"			\
	".extern __environ\n\t"				\
	".type __environ,@object\n\t"			\
	".extern atexit\n\t"				\
	".type atexit,@function");
#endif

/* Handle special EH pointer encodings.  Absolute, pc-relative, and
   indirect are handled automatically.  */
#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  do {									\
    if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)		\
      {									\
        fputs (ASM_LONG, FILE);			\
        assemble_name (FILE, XSTR (ADDR, 0));				\
	fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
        goto DONE;							\
      }									\
  } while (0)

/* Used by crtstuff.c to initialize the base of data-relative relocations.
   These are GOT relative on x86, so return the pic register.  */
#ifdef __PIC__
#define CRT_GET_RFIB_DATA(BASE)			\
  {						\
    register void *ebx_ __asm__("ebx");		\
    BASE = ebx_;				\
  }
#else
#define CRT_GET_RFIB_DATA(BASE)						\
  __asm__ ("call\t.LPR%=\n"						\
	   ".LPR%=:\n\t"						\
	   "popl\t%0\n\t"						\
	   /* Due to a GAS bug, this cannot use EAX.  That encodes	\
	      smaller than the traditional EBX, which results in the	\
	      offset being off by one.  */				\
	   "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"			\
	   : "=d"(BASE))
#endif

/* Do code reading to identify a signal frame, and set the frame
   state data appropriately.  See unwind-dw2.c for the structs.  */

#ifdef IN_LIBGCC2
/* There's no sys/ucontext.h for some (all?) libc1, so no
   signal-turned-exceptions for them.  There's also no configure-run for
   the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H.  Using the
   target libc1 macro should be enough.  */
#ifndef USE_GNULIBC_1
#include <signal.h>
#include <sys/ucontext.h>

#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)		\
  do {									\
    unsigned char *pc_ = (CONTEXT)->ra;					\
    struct sigcontext *sc_;						\
    long new_cfa_;							\
									\
    /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80  */		\
    if (*(unsigned short *)(pc_+0) == 0xb858				\
	&& *(unsigned int *)(pc_+2) == 119				\
	&& *(unsigned short *)(pc_+6) == 0x80cd)			\
      sc_ = (CONTEXT)->cfa + 4;						\
    /* movl $__NR_rt_sigreturn,%eax ; int $0x80  */			\
    else if (*(unsigned char *)(pc_+0) == 0xb8				\
	     && *(unsigned int *)(pc_+1) == 173				\
	     && *(unsigned short *)(pc_+5) == 0x80cd)			\
      {									\
	struct rt_sigframe {						\
	  int sig;							\
	  struct siginfo *pinfo;					\
	  void *puc;							\
	  struct siginfo info;						\
	  struct ucontext uc;						\
	} *rt_ = (CONTEXT)->cfa;					\
	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext;		\
      }									\
    else								\
      break;								\
									\
    new_cfa_ = sc_->esp;						\
    (FS)->cfa_how = CFA_REG_OFFSET;					\
    (FS)->cfa_reg = 4;							\
    (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa;		\
									\
    /* The SVR4 register numbering macros aren't usable in libgcc.  */	\
    (FS)->regs.reg[0].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_;		\
    (FS)->regs.reg[3].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_;		\
    (FS)->regs.reg[1].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_;		\
    (FS)->regs.reg[2].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_;		\
    (FS)->regs.reg[6].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_;		\
    (FS)->regs.reg[7].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_;		\
    (FS)->regs.reg[5].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_;		\
    (FS)->regs.reg[8].how = REG_SAVED_OFFSET;				\
    (FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_;		\
    (FS)->retaddr_column = 8;						\
    goto SUCCESS;							\
  } while (0)
#endif /* not USE_GNULIBC_1 */
#endif /* IN_LIBGCC2 */
Commit	Line	Data
9ec36da5	1	/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
cea3bd3e RH	2	Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002
cea3bd3e RH	3	Free Software Foundation, Inc.
bb1835d2 RK	4	Contributed by Eric Youngdale.
bb1835d2 RK	5	Modified for stabs-in-ELF by H.J. Lu.
4a86a6d2 RK	6
	7	This file is part of GNU CC.
	8
	9	GNU CC is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2, or (at your option)
	12	any later version.
	13
	14	GNU CC is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with GNU CC; see the file COPYING. If not, write to
97aadbb9 RK	21	the Free Software Foundation, 59 Temple Place - Suite 330,
97aadbb9 RK	22	Boston, MA 02111-1307, USA. */
1cf549b1	23
bb1835d2 RK	24	#define LINUX_DEFAULT_ELF
bb1835d2 RK	25
d984704d DN	26	/* Output at beginning of assembler file. */
	27	/* The .file command should always begin the output. */
	28	#undef ASM_FILE_START
	29	#define ASM_FILE_START(FILE) \
	30	do { \
	31	output_file_directive (FILE, main_input_filename); \
c93e80a5	32	if (ix86_asm_dialect == ASM_INTEL) \
d984704d	33	fputs ("\t.intel_syntax\n", FILE); \
d984704d DN	34	} while (0)
d984704d DN	35
c3b11311	36	#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
bb1835d2 RK	37
	38	/* The svr4 ABI for the i386 says that records and unions are returned
	39	in memory. */
	40	#undef DEFAULT_PCC_STRUCT_RETURN
	41	#define DEFAULT_PCC_STRUCT_RETURN 1
	42
bebc4663 JL	43	#undef ASM_COMMENT_START
	44	#define ASM_COMMENT_START "#"
	45
bb1835d2	46	#undef DBX_REGISTER_NUMBER
0f7fa3d0 JH	47	#define DBX_REGISTER_NUMBER(n) \
0f7fa3d0 JH	48	(TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
bb1835d2	49
dcacfa04 ZW	50	/* Output assembler code to FILE to call the profiler.
	51	To the best of my knowledge, no Linux libc has required the label
	52	argument to mcount. */
	53
	54	#define NO_PROFILE_COUNTERS
bb1835d2	55
a5fa1ecd JH	56	#undef MCOUNT_NAME
a5fa1ecd JH	57	#define MCOUNT_NAME "mcount"
d345a981	58
a7943381	59	/* The GLIBC version of mcount for the x86 assumes that there is a
4da5f005 MM	60	frame, so we cannot allow profiling without a frame pointer. */
4da5f005 MM	61
a7943381 RH	62	#undef SUBTARGET_FRAME_POINTER_REQUIRED
a7943381 RH	63	#define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile
4da5f005	64
1cf549b1 RS	65	#undef SIZE_TYPE
1cf549b1 RS	66	#define SIZE_TYPE "unsigned int"
bb1835d2	67
1cf549b1 RS	68	#undef PTRDIFF_TYPE
1cf549b1 RS	69	#define PTRDIFF_TYPE "int"
bb1835d2	70
1cf549b1 RS	71	#undef WCHAR_TYPE
1cf549b1 RS	72	#define WCHAR_TYPE "long int"
bb1835d2	73
1cf549b1 RS	74	#undef WCHAR_TYPE_SIZE
1cf549b1 RS	75	#define WCHAR_TYPE_SIZE BITS_PER_WORD
bb1835d2	76
f23a084d NB	77	#define TARGET_OS_CPP_BUILTINS() \
	78	do \
	79	{ \
	80	builtin_define_std ("linux"); \
	81	builtin_define_std ("unix"); \
	82	builtin_define ("__ELF__"); \
	83	builtin_define ("__gnu_linux__"); \
	84	builtin_assert ("system=posix"); \
	85	if (flag_pic) \
	86	{ \
	87	builtin_define ("__PIC__"); \
	88	builtin_define ("__pic__"); \
	89	} \
	90	} \
	91	while (0)
1cf549b1	92
bb1835d2	93	#undef CPP_SPEC
5f62d4e1	94	#ifdef USE_GNULIBC_1
f23a084d	95	#define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
5f62d4e1	96	#else
f23a084d	97	#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
5f62d4e1	98	#endif
1cf549b1	99
b52fbc26 RK	100	#undef CC1_SPEC
	101	#define CC1_SPEC "%(cc1_cpu) %{profile:-p}"
	102
c3b11311	103	/* Provide a LINK_SPEC appropriate for Linux. Here we provide support
bb1835d2 RK	104	for the special GCC options -static and -shared, which allow us to
	105	link things in one of these three modes by applying the appropriate
	106	combinations of options at link-time. We like to support here for
	107	as many of the other GNU linker options as possible. But I don't
	108	have the time to search for those flags. I am sure how to add
	109	support for -soname shared_object_name. H.J.
	110
	111	I took out %{v:%{!V:-V}}. It is too much :-(. They can use
	112	-Wl,-V.
	113
	114	When the -shared link option is used a final link is not being
	115	done. */
	116
892a2d68	117	/* If ELF is the default format, we should not use /lib/elf. */
bb1835d2 RK	118
bb1835d2 RK	119	#undef LINK_SPEC
5f62d4e1	120	#ifdef USE_GNULIBC_1
bb1835d2 RK	121	#ifndef LINUX_DEFAULT_ELF
	122	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	123	%{!shared: \
	124	%{!ibcs: \
	125	%{!static: \
	126	%{rdynamic:-export-dynamic} \
	127	%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
	128	%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
22cc53bc	129	#else
bb1835d2 RK	130	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	131	%{!shared: \
	132	%{!ibcs: \
	133	%{!static: \
	134	%{rdynamic:-export-dynamic} \
	135	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
	136	%{static:-static}}}"
22cc53bc	137	#endif
5f62d4e1 RK	138	#else
	139	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	140	%{!shared: \
	141	%{!ibcs: \
	142	%{!static: \
	143	%{rdynamic:-export-dynamic} \
	144	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
	145	%{static:-static}}}"
	146	#endif
6c2afd82	147
17d6fedc	148	/* A C statement (sans semicolon) to output to the stdio stream
ca4fca3e	149	FILE the assembler definition of uninitialized global DECL named
17d6fedc JM	150	NAME whose size is SIZE bytes and alignment is ALIGN bytes.
	151	Try to use asm_output_aligned_bss to implement this macro. */
	152
ca4fca3e DE	153	#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
ca4fca3e DE	154	asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
de3eb7b7 L	155
	156	/* A C statement to output to the stdio stream FILE an assembler
	157	command to advance the location counter to a multiple of 1<<LOG
	158	bytes if it is within MAX_SKIP bytes.
	159
	160	This is used to align code labels according to Intel recommendations. */
	161
80de1662	162	#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
8c8a9717 JM	163	#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
8c8a9717 JM	164	do { \
0385ba57	165	if ((LOG) != 0) { \
8401285e	166	if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
8c8a9717	167	else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
0385ba57	168	} \
8c8a9717	169	} while (0)
80de1662	170	#endif
373368fd JJ	171
	172	#if defined(__PIC__) && defined (USE_GNULIBC_1)
	173	/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
cea3bd3e RH	174	__environ and atexit. We have to make sure they are in the .dynsym
	175	section. We do this by forcing the assembler to create undefined
	176	references to these symbols in the object file. */
	177	#undef CRT_CALL_STATIC_FUNCTION
	178	#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
	179	asm (SECTION_OP "\n\t" \
	180	"call " USER_LABEL_PREFIX #FUNC "\n" \
	181	TEXT_SECTION_ASM_OP "\n\t" \
	182	".extern ___brk_addr\n\t" \
	183	".type ___brk_addr,@object\n\t" \
	184	".extern __environ\n\t" \
	185	".type __environ,@object\n\t" \
	186	".extern atexit\n\t" \
	187	".type atexit,@function");
373368fd	188	#endif
1020a5ab	189
1066e2b5 RH	190	/* Handle special EH pointer encodings. Absolute, pc-relative, and
	191	indirect are handled automatically. */
	192	#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
	193	do { \
	194	if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
	195	{ \
301d03af	196	fputs (ASM_LONG, FILE); \
1066e2b5 RH	197	assemble_name (FILE, XSTR (ADDR, 0)); \
	198	fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
	199	goto DONE; \
	200	} \
	201	} while (0)
	202
	203	/* Used by crtstuff.c to initialize the base of data-relative relocations.
	204	These are GOT relative on x86, so return the pic register. */
	205	#ifdef __PIC__
	206	#define CRT_GET_RFIB_DATA(BASE) \
	207	{ \
	208	register void *ebx_ __asm__("ebx"); \
	209	BASE = ebx_; \
	210	}
	211	#else
	212	#define CRT_GET_RFIB_DATA(BASE) \
	213	__asm__ ("call\t.LPR%=\n" \
	214	".LPR%=:\n\t" \
	215	"popl\t%0\n\t" \
	216	/* Due to a GAS bug, this cannot use EAX. That encodes \
	217	smaller than the traditional EBX, which results in the \
	218	offset being off by one. */ \
	219	"addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
	220	: "=d"(BASE))
	221	#endif
	222
1020a5ab RH	223	/* Do code reading to identify a signal frame, and set the frame
	224	state data appropriately. See unwind-dw2.c for the structs. */
	225
	226	#ifdef IN_LIBGCC2
a7475ab1 HPN	227	/* There's no sys/ucontext.h for some (all?) libc1, so no
	228	signal-turned-exceptions for them. There's also no configure-run for
	229	the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the
	230	target libc1 macro should be enough. */
	231	#ifndef USE_GNULIBC_1
1020a5ab RH	232	#include <signal.h>
1020a5ab RH	233	#include <sys/ucontext.h>
1020a5ab RH	234
	235	#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
	236	do { \
	237	unsigned char *pc_ = (CONTEXT)->ra; \
	238	struct sigcontext *sc_; \
	239	long new_cfa_; \
	240	\
	241	/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \
	242	if ((unsigned short )(pc_+0) == 0xb858 \
	243	&& (unsigned int )(pc_+2) == 119 \
	244	&& (unsigned short )(pc_+6) == 0x80cd) \
	245	sc_ = (CONTEXT)->cfa + 4; \
	246	/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \
	247	else if ((unsigned char )(pc_+0) == 0xb8 \
	248	&& (unsigned int )(pc_+1) == 173 \
	249	&& (unsigned short )(pc_+5) == 0x80cd) \
	250	{ \
	251	struct rt_sigframe { \
	252	int sig; \
	253	struct siginfo *pinfo; \
	254	void *puc; \
	255	struct siginfo info; \
	256	struct ucontext uc; \
	257	} *rt_ = (CONTEXT)->cfa; \
	258	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \
	259	} \
	260	else \
	261	break; \
	262	\
	263	new_cfa_ = sc_->esp; \
	264	(FS)->cfa_how = CFA_REG_OFFSET; \
	265	(FS)->cfa_reg = 4; \
	266	(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
	267	\
	268	/* The SVR4 register numbering macros aren't usable in libgcc. */ \
	269	(FS)->regs.reg[0].how = REG_SAVED_OFFSET; \
	270	(FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \
	271	(FS)->regs.reg[3].how = REG_SAVED_OFFSET; \
	272	(FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \
	273	(FS)->regs.reg[1].how = REG_SAVED_OFFSET; \
	274	(FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \
	275	(FS)->regs.reg[2].how = REG_SAVED_OFFSET; \
	276	(FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \
	277	(FS)->regs.reg[6].how = REG_SAVED_OFFSET; \
	278	(FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \
	279	(FS)->regs.reg[7].how = REG_SAVED_OFFSET; \
	280	(FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \
	281	(FS)->regs.reg[5].how = REG_SAVED_OFFSET; \
	282	(FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \
	283	(FS)->regs.reg[8].how = REG_SAVED_OFFSET; \
	284	(FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \
	285	(FS)->retaddr_column = 8; \
	286	goto SUCCESS; \
	287	} while (0)
a7475ab1 HPN	288	#endif /* not USE_GNULIBC_1 */
a7475ab1 HPN	289	#endif /* IN_LIBGCC2 */