mirror of
https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
synced 2025-09-12 08:36:05 -04:00
196 lines
6.9 KiB
C
196 lines
6.9 KiB
C
/* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF.
|
|
Copyright (C) 1996-2013 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson (rth@tamu.edu).
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC 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 3, or (at your option)
|
|
any later version.
|
|
|
|
GCC 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 GCC; see the file COPYING3. If not see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#undef OBJECT_FORMAT_COFF
|
|
#undef EXTENDED_COFF
|
|
#define OBJECT_FORMAT_ELF
|
|
|
|
/* ??? Move all SDB stuff from alpha.h to osf.h. */
|
|
#undef SDB_DEBUGGING_INFO
|
|
#undef DBX_DEBUGGING_INFO
|
|
|
|
#define DWARF2_DEBUGGING_INFO 1
|
|
|
|
#undef PREFERRED_DEBUGGING_TYPE
|
|
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
|
|
|
|
#undef ASM_FINAL_SPEC
|
|
|
|
/* alpha/ doesn't use elfos.h for some reason. */
|
|
#define TARGET_OBJFMT_CPP_BUILTINS() \
|
|
do \
|
|
{ \
|
|
builtin_define ("__ELF__"); \
|
|
} \
|
|
while (0)
|
|
|
|
#undef CC1_SPEC
|
|
#define CC1_SPEC "%{G*}"
|
|
|
|
#undef ASM_SPEC
|
|
#define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}"
|
|
|
|
/* Do not output a .file directive at the beginning of the input file. */
|
|
|
|
#undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
|
|
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
|
|
|
|
/* This is how to output an assembler line
|
|
that says to advance the location counter
|
|
to a multiple of 2**LOG bytes. */
|
|
|
|
#define ASM_OUTPUT_ALIGN(FILE,LOG) \
|
|
if ((LOG) != 0) \
|
|
fprintf (FILE, "\t.align %d\n", LOG);
|
|
|
|
/* 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 ((SIZE) <= (unsigned HOST_WIDE_INT) g_switch_value) \
|
|
switch_to_section (sbss_section); \
|
|
else \
|
|
switch_to_section (bss_section); \
|
|
ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
|
|
if (!flag_inhibit_size_directive) \
|
|
ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
|
|
ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
|
|
ASM_OUTPUT_LABEL(FILE, NAME); \
|
|
ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
|
|
} while (0)
|
|
|
|
/* This says how to output assembler code to declare an
|
|
uninitialized external linkage data object. */
|
|
|
|
#undef ASM_OUTPUT_ALIGNED_BSS
|
|
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
|
|
do { \
|
|
ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \
|
|
} while (0)
|
|
|
|
#undef BSS_SECTION_ASM_OP
|
|
#define BSS_SECTION_ASM_OP "\t.section\t.bss"
|
|
#undef SBSS_SECTION_ASM_OP
|
|
#define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\""
|
|
#undef SDATA_SECTION_ASM_OP
|
|
#define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\""
|
|
|
|
/* This is how we tell the assembler that two symbols have the same value. */
|
|
|
|
#undef ASM_OUTPUT_DEF
|
|
#define ASM_OUTPUT_DEF(FILE, ALIAS, NAME) \
|
|
do { \
|
|
assemble_name(FILE, ALIAS); \
|
|
fputs(" = ", FILE); \
|
|
assemble_name(FILE, NAME); \
|
|
fputc('\n', FILE); \
|
|
} while (0)
|
|
|
|
#undef ASM_OUTPUT_DEF_FROM_DECLS
|
|
#define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET) \
|
|
do { \
|
|
const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
|
|
const char *name = IDENTIFIER_POINTER (TARGET); \
|
|
if (TREE_CODE (DECL) == FUNCTION_DECL) \
|
|
{ \
|
|
fputc ('$', FILE); \
|
|
assemble_name (FILE, alias); \
|
|
fputs ("..ng = $", FILE); \
|
|
assemble_name (FILE, name); \
|
|
fputs ("..ng\n", FILE); \
|
|
} \
|
|
ASM_OUTPUT_DEF (FILE, alias, name); \
|
|
} while (0)
|
|
|
|
/* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the
|
|
(even more) magical crtbegin.o file which provides part of the
|
|
support for getting C++ file-scope static object constructed
|
|
before entering `main'. */
|
|
|
|
#undef STARTFILE_SPEC
|
|
#ifdef HAVE_LD_PIE
|
|
#define STARTFILE_SPEC \
|
|
"%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
|
|
crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
|
|
#else
|
|
#define STARTFILE_SPEC \
|
|
"%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
|
|
crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
|
|
#endif
|
|
|
|
/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
|
|
magical crtend.o file which provides part of the support for
|
|
getting C++ file-scope static object constructed before entering
|
|
`main', followed by a normal ELF "finalizer" file, `crtn.o'. */
|
|
|
|
#undef ENDFILE_SPEC
|
|
#define ENDFILE_SPEC \
|
|
"%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
|
|
%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
|
|
|
|
/* This variable should be set to 'true' if the target ABI requires
|
|
unwinding tables even when exceptions are not used. */
|
|
#define TARGET_UNWIND_TABLES_DEFAULT true
|
|
|
|
/* Select a format to encode pointers in exception handling data. CODE
|
|
is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
|
|
true if the symbol may be affected by dynamic relocations.
|
|
|
|
Since application size is already constrained to <2GB by the form of
|
|
the ldgp relocation, we can use a 32-bit pc-relative relocation to
|
|
static data. Dynamic data is accessed indirectly to allow for read
|
|
only EH sections. */
|
|
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
|
|
(((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
|
|
|
|
/* If defined, a C statement to be executed just prior to the output of
|
|
assembler code for INSN. */
|
|
#define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
|
|
(alpha_this_literal_sequence_number = 0, \
|
|
alpha_this_gpdisp_sequence_number = 0)
|
|
extern int alpha_this_literal_sequence_number;
|
|
extern int alpha_this_gpdisp_sequence_number;
|
|
|
|
/* Since the bits of the _init and _fini function is spread across
|
|
many object files, each potentially with its own GP, we must assume
|
|
we need to load our GP. Further, the .init/.fini section can
|
|
easily be more than 4MB away from the function to call so we can't
|
|
use bsr. */
|
|
#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
|
|
asm (SECTION_OP "\n" \
|
|
" br $29,1f\n" \
|
|
"1: ldgp $29,0($29)\n" \
|
|
" unop\n" \
|
|
" jsr $26," USER_LABEL_PREFIX #FUNC "\n" \
|
|
" .align 3\n" \
|
|
" .previous");
|
|
|
|
/* If we have the capability create headers for efficient EH lookup.
|
|
As of Jan 2002, only glibc 2.2.4 can actually make use of this, but
|
|
I imagine that other systems will catch up. In the meantime, it
|
|
doesn't harm to make sure that the data exists to be used later. */
|
|
#if defined(HAVE_LD_EH_FRAME_HDR) && !defined(LINK_EH_SPEC)
|
|
#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
|
|
#endif
|