672 lines
23 KiB
C
672 lines
23 KiB
C
/* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Contributed by Richard Henderson (rth@tamu.edu).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* $FreeBSD$ */
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#undef OBJECT_FORMAT_COFF
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#undef EXTENDED_COFF
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#define OBJECT_FORMAT_ELF
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/* ??? Move all SDB stuff from alpha.h to osf.h. */
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#undef SDB_DEBUGGING_INFO
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#define DBX_DEBUGGING_INFO
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#define DWARF2_DEBUGGING_INFO
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#undef PREFERRED_DEBUGGING_TYPE
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#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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#undef ASM_FINAL_SPEC
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#undef CC1_SPEC
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#define CC1_SPEC "%{G*}"
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#undef ASM_SPEC
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#define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}"
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#undef LINK_SPEC
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#define LINK_SPEC "-m elf64alpha %{G*} %{relax:-relax} \
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%{O*:-O3} %{!O*:-O1} \
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%{shared:-shared} \
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%{!shared: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker %(elf_dynamic_linker)}} \
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%{static:-static}}"
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/* Output at beginning of assembler file. */
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#undef ASM_FILE_START
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#define ASM_FILE_START(FILE) \
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do { \
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if (write_symbols == DBX_DEBUG) \
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{ \
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alpha_write_verstamp (FILE); \
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output_file_directive (FILE, main_input_filename); \
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} \
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fprintf (FILE, "\t.set noat\n"); \
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fprintf (FILE, "\t.set noreorder\n"); \
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if (TARGET_EXPLICIT_RELOCS) \
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fprintf (FILE, "\t.set nomacro\n"); \
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if (TARGET_BWX | TARGET_MAX | TARGET_FIX | TARGET_CIX) \
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{ \
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fprintf (FILE, "\t.arch %s\n", \
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(TARGET_CPU_EV6 ? "ev6" \
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: TARGET_MAX ? "pca56" : "ev56")); \
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} \
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} while (0)
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#undef IDENT_ASM_OP
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#define IDENT_ASM_OP "\t.ident\t"
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/* Allow #sccs in preprocessor. */
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#define SCCS_DIRECTIVE
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/* Output #ident as a .ident. */
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#undef ASM_OUTPUT_IDENT
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#define ASM_OUTPUT_IDENT(FILE, NAME) \
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fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
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/* This is how to allocate empty space in some section. The .zero
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pseudo-op is used for this on most svr4 assemblers. */
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#undef SKIP_ASM_OP
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#define SKIP_ASM_OP "\t.zero\t"
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#undef ASM_OUTPUT_SKIP
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#define ASM_OUTPUT_SKIP(FILE, SIZE) \
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fprintf (FILE, "%s%u\n", SKIP_ASM_OP, (SIZE))
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/* Output the label which precedes a jumptable. Note that for all svr4
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systems where we actually generate jumptables (which is to say every
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svr4 target except i386, where we use casesi instead) we put the jump-
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tables into the .rodata section and since other stuff could have been
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put into the .rodata section prior to any given jumptable, we have to
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make sure that the location counter for the .rodata section gets pro-
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perly re-aligned prior to the actual beginning of the jump table. */
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#undef ALIGN_ASM_OP
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#define ALIGN_ASM_OP "\t.align\t"
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#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
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ASM_OUTPUT_ALIGN ((FILE), 2);
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#endif
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#undef ASM_OUTPUT_CASE_LABEL
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#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
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do { \
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ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
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ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
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} while (0)
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/* The standard SVR4 assembler seems to require that certain builtin
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library routines (e.g. .udiv) be explicitly declared as .globl
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in each assembly file where they are referenced. */
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#undef ASM_OUTPUT_EXTERNAL_LIBCALL
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#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
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/* This says how to output assembler code to declare an
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uninitialized external linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#undef COMMON_ASM_OP
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#define COMMON_ASM_OP "\t.comm\t"
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#undef ASM_OUTPUT_ALIGNED_COMMON
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#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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do { \
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fprintf ((FILE), "%s", COMMON_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
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} while (0)
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/* This says how to output assembler code to declare an
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uninitialized internal linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#undef ASM_OUTPUT_ALIGNED_LOCAL
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#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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do { \
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if ((SIZE) <= g_switch_value) \
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sbss_section(); \
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else \
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bss_section(); \
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fprintf (FILE, "%s", TYPE_ASM_OP); \
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assemble_name (FILE, NAME); \
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putc (',', FILE); \
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fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
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putc ('\n', FILE); \
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if (!flag_inhibit_size_directive) \
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{ \
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fprintf (FILE, "%s", SIZE_ASM_OP); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, ",%d\n", (SIZE)); \
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} \
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ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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ASM_OUTPUT_SKIP((FILE), (SIZE)); \
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} while (0)
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/* Biggest alignment supported by the object file format of this
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machine. Use this macro to limit the alignment which can be
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specified using the `__attribute__ ((aligned (N)))' construct. If
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not defined, the default value is `BIGGEST_ALIGNMENT'.
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This value is really 2^63. Since gcc figures the alignment in bits,
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we could only potentially get to 2^60 on suitible hosts. Due to other
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considerations in varasm, we must restrict this to what fits in an int. */
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#undef MAX_OFILE_ALIGNMENT
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#define MAX_OFILE_ALIGNMENT \
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(1 << (HOST_BITS_PER_INT < 64 ? HOST_BITS_PER_INT - 2 : 62))
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/* This is the pseudo-op used to generate a contiguous sequence of byte
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values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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#undef ASCII_DATA_ASM_OP
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#define ASCII_DATA_ASM_OP "\t.ascii\t"
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/* Support const sections and the ctors and dtors sections for g++.
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Note that there appears to be two different ways to support const
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sections at the moment. You can either #define the symbol
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READONLY_DATA_SECTION (giving it some code which switches to the
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readonly data section) or else you can #define the symbols
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EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
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SELECT_RTX_SECTION. We do both here just to be on the safe side. */
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#undef USE_CONST_SECTION
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#define USE_CONST_SECTION 1
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#undef CONST_SECTION_ASM_OP
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#define CONST_SECTION_ASM_OP "\t.section\t.rodata"
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#undef BSS_SECTION_ASM_OP
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#define BSS_SECTION_ASM_OP "\t.section\t.bss"
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#undef SBSS_SECTION_ASM_OP
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#define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\""
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#undef SDATA_SECTION_ASM_OP
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#define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\""
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/* On svr4, we *do* have support for the .init and .fini sections, and we
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can put stuff in there to be executed before and after `main'. We let
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crtstuff.c and other files know this by defining the following symbols.
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The definitions say how to change sections to the .init and .fini
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sections. This is the same for all known svr4 assemblers. */
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#undef INIT_SECTION_ASM_OP
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#define INIT_SECTION_ASM_OP "\t.section\t.init"
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#undef FINI_SECTION_ASM_OP
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#define FINI_SECTION_ASM_OP "\t.section\t.fini"
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#ifdef HAVE_GAS_SUBSECTION_ORDERING
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#define ASM_SECTION_START_OP "\t.subsection\t-1"
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/* Output assembly directive to move to the beginning of current section. */
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#define ASM_OUTPUT_SECTION_START(FILE) \
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fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
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#endif
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/* A default list of other sections which we might be "in" at any given
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time. For targets that use additional sections (e.g. .tdesc) you
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should override this definition in the target-specific file which
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includes this file. */
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#undef EXTRA_SECTIONS
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#define EXTRA_SECTIONS in_const, in_sbss, in_sdata
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/* A default list of extra section function definitions. For targets
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that use additional sections (e.g. .tdesc) you should override this
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definition in the target-specific file which includes this file. */
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#undef EXTRA_SECTION_FUNCTIONS
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#define EXTRA_SECTION_FUNCTIONS \
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CONST_SECTION_FUNCTION \
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SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP) \
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SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP)
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extern void sbss_section PARAMS ((void));
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extern void sdata_section PARAMS ((void));
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#undef READONLY_DATA_SECTION
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#define READONLY_DATA_SECTION() const_section ()
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#undef CONST_SECTION_FUNCTION
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#define CONST_SECTION_FUNCTION \
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void \
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const_section () \
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{ \
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if (!USE_CONST_SECTION) \
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text_section(); \
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else if (in_section != in_const) \
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{ \
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fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
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in_section = in_const; \
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} \
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}
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#undef SECTION_FUNCTION_TEMPLATE
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#define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP) \
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void FN () \
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{ \
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if (in_section != ENUM) \
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{ \
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fprintf (asm_out_file, "%s\n", OP); \
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in_section = ENUM; \
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} \
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}
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/* Switch into a generic section. */
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#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
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/* A C statement or statements to switch to the appropriate
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section for output of DECL. DECL is either a `VAR_DECL' node
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or a constant of some sort. RELOC indicates whether forming
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the initial value of DECL requires link-time relocations.
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Set SECNUM to:
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0 .text
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1 .rodata
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2 .data
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3 .sdata
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4 .bss
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5 .sbss
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*/
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#define DO_SELECT_SECTION(SECNUM, DECL, RELOC) \
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do \
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{ \
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HOST_WIDE_INT size; \
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SECNUM = 1; \
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if (TREE_CODE (DECL) == FUNCTION_DECL) \
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{ \
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SECNUM = 0; \
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break; \
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} \
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else if (TREE_CODE (DECL) == STRING_CST) \
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{ \
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if (flag_writable_strings) \
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SECNUM = 2; \
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else \
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SECNUM = 0x101; \
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break; \
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} \
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else if (TREE_CODE (DECL) == VAR_DECL) \
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{ \
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if (DECL_INITIAL (DECL) == NULL \
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|| DECL_INITIAL (DECL) == error_mark_node) \
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SECNUM = 4; \
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else if ((flag_pic && RELOC) \
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|| ! TREE_READONLY (DECL) \
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|| TREE_SIDE_EFFECTS (DECL) \
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|| ! TREE_CONSTANT (DECL_INITIAL (DECL))) \
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SECNUM = 2; \
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else if (flag_merge_constants >= 2) \
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{ \
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/* C and C++ don't allow different variables to \
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share the same location. -fmerge-all-constants\
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allows even that (at the expense of not \
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conforming). */ \
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if (TREE_CODE (DECL_INITIAL (DECL)) == STRING_CST)\
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SECNUM = 0x201; \
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else \
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SECNUM = 0x301; \
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} \
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} \
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else if (TREE_CODE (DECL) == CONSTRUCTOR) \
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{ \
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if ((flag_pic && RELOC) \
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|| TREE_SIDE_EFFECTS (DECL) \
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|| ! TREE_CONSTANT (DECL)) \
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SECNUM = 2; \
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} \
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\
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/* Select small data sections based on size. */ \
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size = int_size_in_bytes (TREE_TYPE (DECL)); \
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if (size >= 0 && size <= g_switch_value) \
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{ \
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if ((SECNUM & 0xff) >= 2) \
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SECNUM += 1; \
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/* Move readonly data to .sdata only if -msmall-data. */ \
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/* ??? Consider .sdata.{lit4,lit8} as \
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SHF_MERGE|SHF_ALPHA_GPREL. */ \
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else if (TARGET_SMALL_DATA) \
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SECNUM = 3; \
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} \
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} \
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while (0)
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#undef SELECT_SECTION
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#define SELECT_SECTION(DECL, RELOC, ALIGN) \
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do \
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{ \
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typedef void (*sec_fn) PARAMS ((void)); \
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static sec_fn const sec_functions[6] = \
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{ \
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text_section, \
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const_section, \
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data_section, \
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sdata_section, \
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bss_section, \
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sbss_section \
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}; \
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\
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int sec; \
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\
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DO_SELECT_SECTION (sec, DECL, RELOC); \
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\
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switch (sec) \
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{ \
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case 0x101: \
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mergeable_string_section (DECL, ALIGN, 0); \
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break; \
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case 0x201: \
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mergeable_string_section (DECL_INITIAL (DECL),\
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ALIGN, 0); \
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break; \
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case 0x301: \
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mergeable_constant_section (DECL_MODE (DECL), \
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ALIGN, 0); \
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break; \
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default: \
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(*sec_functions[sec]) (); \
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break; \
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} \
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} \
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while (0)
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#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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#undef UNIQUE_SECTION
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#define UNIQUE_SECTION(DECL, RELOC) \
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do \
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{ \
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static const char * const prefixes[6][2] = \
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{ \
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{ ".text.", ".gnu.linkonce.t." }, \
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{ ".rodata.", ".gnu.linkonce.r." }, \
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{ ".data.", ".gnu.linkonce.d." }, \
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{ ".sdata.", ".gnu.linkonce.s." }, \
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{ ".bss.", ".gnu.linkonce.b." }, \
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{ ".sbss.", ".gnu.linkonce.sb." } \
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}; \
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\
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int nlen, plen, sec; \
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const char *name, *prefix; \
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char *string; \
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\
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DO_SELECT_SECTION (sec, DECL, RELOC); \
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\
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name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
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STRIP_NAME_ENCODING (name, name); \
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nlen = strlen (name); \
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\
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prefix = prefixes[sec & 0xff][DECL_ONE_ONLY(DECL)]; \
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plen = strlen (prefix); \
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\
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string = alloca (nlen + plen + 1); \
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\
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memcpy (string, prefix, plen); \
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memcpy (string + plen, name, nlen + 1); \
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\
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DECL_SECTION_NAME (DECL) = build_string (nlen + plen, string); \
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} \
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while (0)
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/* A C statement or statements to switch to the appropriate
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section for output of RTX in mode MODE. RTX is some kind
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of constant in RTL. The argument MODE is redundant except
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in the case of a `const_int' rtx. Currently, these always
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go into the const section. */
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#undef SELECT_RTX_SECTION
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#define SELECT_RTX_SECTION(MODE, RTX, ALIGN) \
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do { \
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if (TARGET_SMALL_DATA && GET_MODE_SIZE (MODE) <= g_switch_value) \
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/* ??? Consider .sdata.{lit4,lit8} as SHF_MERGE|SHF_ALPHA_GPREL. */ \
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sdata_section (); \
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else \
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mergeable_constant_section((MODE), (ALIGN), 0); \
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} while (0)
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/* Define the strings used for the special svr4 .type and .size directives.
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These strings generally do not vary from one system running svr4 to
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another, but if a given system (e.g. m88k running svr) needs to use
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different pseudo-op names for these, they may be overridden in the
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file which includes this one. */
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#undef TYPE_ASM_OP
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#define TYPE_ASM_OP "\t.type\t"
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#undef SIZE_ASM_OP
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#define SIZE_ASM_OP "\t.size\t"
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/* This is how we tell the assembler that a symbol is weak. */
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#undef ASM_WEAKEN_LABEL
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#define ASM_WEAKEN_LABEL(FILE, NAME) \
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do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
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fputc ('\n', FILE); } while (0)
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/* This is how we tell the assembler that two symbols have the same value. */
|
|
|
|
#undef ASM_OUTPUT_DEF
|
|
#define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
|
|
do { assemble_name(FILE, NAME1); \
|
|
fputs(" = ", FILE); \
|
|
assemble_name(FILE, NAME2); \
|
|
fputc('\n', FILE); } while (0)
|
|
|
|
/* The following macro defines the format used to output the second
|
|
operand of the .type assembler directive. Different svr4 assemblers
|
|
expect various different forms for this operand. The one given here
|
|
is just a default. You may need to override it in your machine-
|
|
specific tm.h file (depending upon the particulars of your assembler). */
|
|
|
|
#undef TYPE_OPERAND_FMT
|
|
#define TYPE_OPERAND_FMT "@%s"
|
|
|
|
/* Write the extra assembler code needed to declare a function's result.
|
|
Most svr4 assemblers don't require any special declaration of the
|
|
result value, but there are exceptions. */
|
|
|
|
#ifndef ASM_DECLARE_RESULT
|
|
#define ASM_DECLARE_RESULT(FILE, RESULT)
|
|
#endif
|
|
|
|
/* These macros generate the special .type and .size directives which
|
|
are used to set the corresponding fields of the linker symbol table
|
|
entries in an ELF object file under SVR4. These macros also output
|
|
the starting labels for the relevant functions/objects. */
|
|
|
|
/* Write the extra assembler code needed to declare an object properly. */
|
|
|
|
#undef ASM_DECLARE_OBJECT_NAME
|
|
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
|
|
do { \
|
|
HOST_WIDE_INT size; \
|
|
fprintf (FILE, "%s", TYPE_ASM_OP); \
|
|
assemble_name (FILE, NAME); \
|
|
putc (',', FILE); \
|
|
fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
|
|
putc ('\n', FILE); \
|
|
size_directive_output = 0; \
|
|
if (!flag_inhibit_size_directive \
|
|
&& DECL_SIZE (DECL) \
|
|
&& (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \
|
|
{ \
|
|
size_directive_output = 1; \
|
|
fprintf (FILE, "%s", SIZE_ASM_OP); \
|
|
assemble_name (FILE, NAME); \
|
|
fputc (',', FILE); \
|
|
fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, size); \
|
|
fputc ('\n', FILE); \
|
|
} \
|
|
ASM_OUTPUT_LABEL(FILE, NAME); \
|
|
} while (0)
|
|
|
|
/* Output the size directive for a decl in rest_of_decl_compilation
|
|
in the case where we did not do so before the initializer.
|
|
Once we find the error_mark_node, we know that the value of
|
|
size_directive_output was set
|
|
by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
|
|
|
|
#undef ASM_FINISH_DECLARE_OBJECT
|
|
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
|
|
do { \
|
|
const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
|
|
HOST_WIDE_INT size; \
|
|
if (!flag_inhibit_size_directive \
|
|
&& DECL_SIZE (DECL) \
|
|
&& ! AT_END && TOP_LEVEL \
|
|
&& DECL_INITIAL (DECL) == error_mark_node \
|
|
&& !size_directive_output \
|
|
&& (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \
|
|
{ \
|
|
size_directive_output = 1; \
|
|
fprintf (FILE, "%s", SIZE_ASM_OP); \
|
|
assemble_name (FILE, name); \
|
|
fputc (',', FILE); \
|
|
fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, size); \
|
|
fputc ('\n', FILE); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
|
|
ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
|
|
corresponds to a particular byte value [0..255]. For any
|
|
given byte value, if the value in the corresponding table
|
|
position is zero, the given character can be output directly.
|
|
If the table value is 1, the byte must be output as a \ooo
|
|
octal escape. If the tables value is anything else, then the
|
|
byte value should be output as a \ followed by the value
|
|
in the table. Note that we can use standard UN*X escape
|
|
sequences for many control characters, but we don't use
|
|
\a to represent BEL because some svr4 assemblers (e.g. on
|
|
the i386) don't know about that. Also, we don't use \v
|
|
since some versions of gas, such as 2.2 did not accept it. */
|
|
|
|
#undef ESCAPES
|
|
#define ESCAPES \
|
|
"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
|
|
\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
|
|
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
|
|
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
|
|
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
|
|
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
|
|
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
|
|
\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
|
|
|
|
/* Some svr4 assemblers have a limit on the number of characters which
|
|
can appear in the operand of a .string directive. If your assembler
|
|
has such a limitation, you should define STRING_LIMIT to reflect that
|
|
limit. Note that at least some svr4 assemblers have a limit on the
|
|
actual number of bytes in the double-quoted string, and that they
|
|
count each character in an escape sequence as one byte. Thus, an
|
|
escape sequence like \377 would count as four bytes.
|
|
|
|
If your target assembler doesn't support the .string directive, you
|
|
should define this to zero. */
|
|
|
|
#undef STRING_LIMIT
|
|
#define STRING_LIMIT ((unsigned) 256)
|
|
#undef STRING_ASM_OP
|
|
#define STRING_ASM_OP "\t.string\t"
|
|
|
|
/* GAS is the only Alpha/ELF assembler. */
|
|
#undef TARGET_GAS
|
|
#define TARGET_GAS (1)
|
|
|
|
/* 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'.
|
|
|
|
Don't bother seeing crtstuff.c -- there is absolutely no hope
|
|
of getting that file to understand multiple GPs. We provide a
|
|
hand-coded assembly version. */
|
|
|
|
#undef STARTFILE_SPEC
|
|
#define STARTFILE_SPEC \
|
|
"%{!shared: \
|
|
%{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}}\
|
|
crti.o%s %{shared:crtbeginS.o%s}%{!shared:crtbegin.o%s}"
|
|
|
|
/* 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 \
|
|
"%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
|
|
%{shared:crtendS.o%s}%{!shared:crtend.o%s} crtn.o%s"
|
|
|
|
/* We support #pragma. */
|
|
#define HANDLE_SYSV_PRAGMA
|
|
|
|
/* 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)
|
|
#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
|
|
#endif
|