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freebsd-dev/contrib/gcc/config/i386/freebsd.h
David E. O'Brien 83728effa9 Fix C++ exception handling. GCC was using the older BSD DBX register numbers 
rather than the ELF ABI/SVR4 ones in its DWARF unwinding.

Submitted by:	Alexander Kabaev <ak03@gte.com>
2002-07-12 17:44:24 +00:00

437 lines
15 KiB
C
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/* Definitions for Intel 386 running FreeBSD with either a.out or ELF format
Copyright (C) 1996, 2000, 2002 Free Software Foundation, Inc.
Contributed by Eric Youngdale.
Modified for stabs-in-ELF by H.J. Lu.
Adapted from GNU/Linux version by John Polstra.
Added support for generating "old a.out gas" on the fly by Peter Wemm.
Continued development by David O'Brien <obrien@freebsd.org>
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. */
/* $FreeBSD$ */
#undef CC1_SPEC
#define CC1_SPEC "%(cc1_cpu) %{profile:-p} \
%{gline:%{!g:%{!g0:%{!g1:%{!g2: -g1}}}}} \
%{maout: %{!mno-underscores: %{!munderscores: -munderscores }}}"
#undef ASM_SPEC
#define ASM_SPEC "%{v*: -v} %{maout: %{fpic:-k} %{fPIC:-k}}"
#undef ASM_FINAL_SPEC
#define ASM_FINAL_SPEC "%|"
/* Provide a LINK_SPEC appropriate for FreeBSD. 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.
When the -shared link option is used a final link is not being
done. */
#undef LINK_SPEC
#define LINK_SPEC "\
%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
%{maout: %{shared:-Bshareable} \
%{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \
%{pg:-Bstatic} %{Z}} \
%{assert*} %{R*}} \
%{!maout: \
%{Wl,*:%*} \
%{v:-V} \
%{assert*} %{R*} %{rpath*} %{defsym*} \
%{shared:-Bshareable %{h*} %{soname*}} \
%{!shared: \
%{!static: \
%{rdynamic: -export-dynamic} \
%{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \
%{static:-Bstatic}} \
%{symbolic:-Bsymbolic}}"
/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add the magical
crtbegin.o file (see crtstuff.c) which provides part of the support for
getting C++ file-scope static object constructed before entering `main'. */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC "\
%{maout: %{shared:c++rt0.o%s} \
%{!shared: \
%{pg:gcrt0.o%s}%{!pg: \
%{static:scrt0.o%s} \
%{!static:crt0.o%s}}}} \
%{!maout: \
%{!shared: \
%{pg:gcrt1.o%s} \
%{!pg: \
%{p:gcrt1.o%s} \
%{!p:crt1.o%s}}} \
crti.o%s \
%{!shared:crtbegin.o%s} \
%{shared:crtbeginS.o%s}}"
/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our
own magical crtend.o file (see crtstuff.c) which provides part of the
support for getting C++ file-scope static object constructed before
entering `main', followed by the normal "finalizer" file, `crtn.o'. */
#undef ENDFILE_SPEC
#define ENDFILE_SPEC "\
%{!maout: \
%{!shared:crtend.o%s} \
%{shared:crtendS.o%s} crtn.o%s}"
/************************[ Target stuff ]***********************************/
/* Define the actual types of some ANSI-mandated types.
Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c,
c-common.c, and config/<arch>/<arch>.h. */
#undef SIZE_TYPE
#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD)
#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)");
#define MASK_PROFILER_EPILOGUE 010000000000
#define MASK_AOUT 004000000000 /* a.out not elf */
#define MASK_UNDERSCORES 002000000000 /* use leading _ */
#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE)
#define TARGET_AOUT (target_flags & MASK_AOUT)
#define TARGET_ELF ((target_flags & MASK_AOUT) == 0)
#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0)
#undef SUBTARGET_SWITCHES
#define SUBTARGET_SWITCHES \
{ "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \
{ "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \
{ "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \
{ "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \
{ "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \
{ "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"},
/* This goes away when the math emulator is fixed. */
#undef TARGET_SUBTARGET_DEFAULT
#define TARGET_SUBTARGET_DEFAULT \
(MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
/* Don't default to pcc-struct-return, we want to retain compatibility with
older gcc versions AND pcc-struct-return is nonreentrant.
(even though 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 0
/* The a.out tools do not support "linkonce" sections. */
#undef SUPPORTS_ONE_ONLY
#define SUPPORTS_ONE_ONLY TARGET_ELF
/* Prefix for internally generated assembler labels. If we aren't using
underscores, we are using prefix `.'s to identify labels that should
be ignored, as in `i386/gas.h' --karl@cs.umb.edu */
#undef LPREFIX
#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L")
/* supply our own hook for calling __main() from main() */
#undef INVOKE__main
#define INVOKE__main
#undef GEN_CALL__MAIN
#define GEN_CALL__MAIN \
do { \
if (!(TARGET_ELF)) \
emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \
VOIDmode, 0); \
} while (0)
/* Tell final.c that we don't need a label passed to mcount. */
#define NO_PROFILE_COUNTERS 1
/* Output assembler code to FILE to begin profiling of the current function.
LABELNO is an optional label. */
#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO) \
do { \
char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \
if (flag_pic) \
fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \
else \
fprintf ((FILE), "\tcall %s\n", _name); \
} while (0)
/* Output assembler code to FILE to end profiling of the current function. */
#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */
/************************[ Assembler stuff ]********************************/
/* Override the default comment-starter of "/" from unix.h. */
#undef ASM_COMMENT_START
#define ASM_COMMENT_START "#"
/* Override the default comment-starter of "/APP" from unix.h. */
#undef ASM_APP_ON
#define ASM_APP_ON "#APP\n"
#undef ASM_APP_OFF
#define ASM_APP_OFF "#NO_APP\n"
/* Override the default string pseudo-op of "\t.string\t" from ../elfos.h.
".string" doesn't work for the aout case. */
#undef STRING_ASM_OP
#define STRING_ASM_OP (TARGET_AOUT ? "\t.asciz\t" : "\t.string\t")
/* Override the use of "\t.section\t.rodata" from ../elfos.h. Neither
".section" nor "rodata" works for the aout case. This forces a fallback
to ".text". */
#undef USE_CONST_SECTION
#define USE_CONST_SECTION TARGET_ELF
/* This is how to store into the string BUF
the symbol_ref name of an internal numbered label where
PREFIX is the class of label and NUM is the number within the class.
This is suitable for output with `assemble_name'. */
#undef ASM_GENERATE_INTERNAL_LABEL
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
sprintf ((LABEL), "*%s%s%u", (TARGET_UNDERSCORES) ? "" : ".", \
(PREFIX), (unsigned) (NUM))
/* This is how to output an internal numbered label where
PREFIX is the class of label and NUM is the number within the class.
For most svr4/ELF systems, the convention is that any symbol which begins
with a period is not put into the linker symbol table by the assembler. */
#undef ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
fprintf ((FILE), "%s%s%u:\n", (TARGET_UNDERSCORES) ? "" : ".", \
(PREFIX), (unsigned) (NUM))
/* This is how to output a reference to a user-level label named NAME. */
#undef ASM_OUTPUT_LABELREF
#define ASM_OUTPUT_LABELREF(FILE, NAME) \
do { \
char *_name = (NAME); \
/* Hack to avoid writing lots of rtl in \
FUNCTION_PROFILER_EPILOGUE (). */ \
if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \
{ \
if (TARGET_AOUT) \
_name++; \
if (flag_pic) \
fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \
else \
fprintf ((FILE), "%s", _name); \
} \
else \
fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \
} while (0)
/* This is how to hack on the symbol code of certain relcalcitrant
symbols to modify their output in output_pic_addr_const (). */
#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */
#undef ASM_OUTPUT_ALIGN
#define ASM_OUTPUT_ALIGN(FILE, LOG) \
do { \
if ((LOG)!=0) { \
if (in_text_section()) \
fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \
else \
fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
} \
} while (0)
#undef ASM_OUTPUT_ALIGNED_COMMON
#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
do { \
if (TARGET_ELF) \
{ \
fprintf ((FILE), "%s", COMMON_ASM_OP); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
} \
else \
{ \
int alignbytes = ((ALIGN) + BITS_PER_UNIT - 1) / BITS_PER_UNIT; \
int rounded = (SIZE); \
rounded += alignbytes - 1; \
rounded = (rounded / alignbytes) * alignbytes; \
fprintf ((FILE), "%s ", COMMON_ASM_OP); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), ",%u\n", (rounded)); \
} \
} while (0)
/* This says how to output assembler code to declare an
uninitialized internal linkage data object. Under SVR4,
the linker seems to want the alignment of data objects
to depend on their types. We do exactly that here. */
#undef ASM_OUTPUT_ALIGNED_LOCAL
#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
do { \
if (TARGET_ELF) \
{ \
fprintf ((FILE), "%s", LOCAL_ASM_OP); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), "\n"); \
ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \
} \
else \
{ \
int rounded = (SIZE); \
if (rounded == 0) rounded = 1; \
rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \
rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \
* (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \
fputs ("\t.lcomm\t", (FILE)); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), ",%u\n", (rounded)); \
} \
} while (0)
/* How to output some space. The rules are different depending on the
object format. */
#undef ASM_OUTPUT_SKIP
#define ASM_OUTPUT_SKIP(FILE, SIZE) \
do { \
if (TARGET_ELF) \
{ \
fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \
} \
else \
{ \
fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \
} \
} while (0)
#undef ASM_OUTPUT_SOURCE_LINE
#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \
do { \
static int sym_lineno = 1; \
if (TARGET_ELF) \
{ \
fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \
assemble_name ((FILE), \
XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \
sym_lineno += 1; \
} \
else \
{ \
fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \
lineno); \
} \
} while (0)
/* 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. */
/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE,
but it is easier to fix in an MD way. */
#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \
do { \
if ((LOG) != 0) { \
if (TARGET_AOUT) \
ASM_OUTPUT_ALIGN ((FILE), (LOG)); \
else 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
/************************[ Debugger stuff ]*********************************/
/* The a.out tools do not support "Lscope" .stabs symbols. */
#undef NO_DBX_FUNCTION_END
#define NO_DBX_FUNCTION_END TARGET_AOUT
#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \
: (write_symbols == DWARF2_DEBUG \
|| write_symbols == DWARF_DEBUG) \
? svr4_dbx_register_map[(n)] \
: dbx_register_map[(n)])
/* The same functions are used to creating the DWARF2 debug info and C++
unwind info (except.c). Regardless of the debug format requested, the
register numbers used in exception unwinding sections still have to be
DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER
macro to mean too much. */
#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \
: svr4_dbx_register_map[(n)])
/* tag end of file in elf mode */
#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END
#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
do { \
if (TARGET_ELF) { \
asm_fprintf ((FILE), \
"\t.text\n\t.stabs \"\",%d,0,0,%LLetext\n%LLetext:\n",\
N_SO); \
} \
} while (0)
/* stabs-in-elf has offsets relative to function beginning */
#undef DBX_OUTPUT_LBRAC
#define DBX_OUTPUT_LBRAC(FILE, NAME) \
do { \
fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \
assemble_name (asmfile, buf); \
if (TARGET_ELF) \
{ \
fputc ('-', asmfile); \
assemble_name (asmfile, \
XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
} \
fprintf (asmfile, "\n"); \
} while (0)
#undef DBX_OUTPUT_RBRAC
#define DBX_OUTPUT_RBRAC(FILE, NAME) \
do { \
fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \
assemble_name (asmfile, buf); \
if (TARGET_ELF) \
{ \
fputc ('-', asmfile); \
assemble_name (asmfile, \
XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
} \
fprintf (asmfile, "\n"); \
} while (0)
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