290 lines
9.0 KiB
C
290 lines
9.0 KiB
C
/* Definitions of target machine for GNU compiler,
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for Thumb with ELF obj format.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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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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#define OBJECT_FORMAT_ELF
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#define CPP_PREDEFINES "-Dthumb -Dthumbelf -D__thumb -Acpu(arm) -Amachine(arm)"
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#include "arm/thumb.h"
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/* Run-time Target Specification. */
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#undef TARGET_VERSION
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#define TARGET_VERSION fputs (" (Thumb/elf)", stderr)
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#define MULTILIB_DEFAULTS { "mlittle-endian" }
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/* Setting this to 32 produces more efficient code, but the value set in previous
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versions of this toolchain was 8, which produces more compact structures. The
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command line option -mstructure_size_boundary=<n> can be used to change this
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value. */
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#undef STRUCTURE_SIZE_BOUNDARY
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#define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary
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extern int arm_structure_size_boundary;
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/* Debug */
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#define DWARF_DEBUGGING_INFO
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#define DWARF2_DEBUGGING_INFO
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#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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/* Note - it is important that these definitions match those in semi.h for the ARM port. */
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#undef LOCAL_LABEL_PREFIX
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#define LOCAL_LABEL_PREFIX "."
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/* A C statement to output assembler commands which will identify the
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object file as having been compiled with GNU CC (or another GNU
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compiler). */
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#define ASM_IDENTIFY_GCC(STREAM) \
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fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
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#undef ASM_FILE_START
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#define ASM_FILE_START(STREAM) \
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do \
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{ \
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extern char * version_string; \
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fprintf ((STREAM), "%s Generated by gcc %s for Thumb/elf\n", \
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ASM_COMMENT_START, version_string); \
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fprintf ((STREAM), ASM_APP_OFF); \
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} \
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while (0)
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/* A C statement to output something to the assembler file to switch to section
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NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
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NULL_TREE. Some target formats do not support arbitrary sections. Do not
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define this macro in such cases. */
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#define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
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do \
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{ \
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if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL) \
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fprintf (STREAM, "\t.section %s,\"ax\",@progbits\n", (NAME)); \
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else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC)) \
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fprintf (STREAM, "\t.section %s,\"a\"\n", (NAME)); \
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else \
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fprintf (STREAM, "\t.section %s,\"aw\"\n", (NAME)); \
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} \
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while (0)
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/* Support the ctors/dtors and other sections. */
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#undef INIT_SECTION_ASM_OP
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/* Define this macro if jump tables (for `tablejump' insns) should be
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output in the text section, along with the assembler instructions.
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Otherwise, the readonly data section is used. */
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#define JUMP_TABLES_IN_TEXT_SECTION 1
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#undef READONLY_DATA_SECTION
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#define READONLY_DATA_SECTION rdata_section
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#undef RDATA_SECTION_ASM_OP
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#define RDATA_SECTION_ASM_OP "\t.section .rodata"
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#undef CTORS_SECTION_ASM_OP
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#define CTORS_SECTION_ASM_OP "\t.section .ctors,\"aw\""
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#undef DTORS_SECTION_ASM_OP
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#define DTORS_SECTION_ASM_OP "\t.section .dtors,\"aw\""
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#define USER_LABEL_PREFIX ""
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/* Don't know how to order these. UNALIGNED_WORD_ASM_OP is in
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dwarf2.out. */
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#define UNALIGNED_WORD_ASM_OP ".4byte"
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#define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR) \
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if (((ADDR)[0] == '.') && ((ADDR)[1] == 'L')) \
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fprintf ((FILE), "\t%s\t%s", UNALIGNED_WORD_ASM_OP, (ADDR)); \
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else \
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fprintf ((FILE), "\t%s\t%s", \
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UNALIGNED_WORD_ASM_OP, (ADDR))
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#define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX) \
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do \
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{ \
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fprintf ((FILE), "\t%s\t", UNALIGNED_WORD_ASM_OP); \
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output_addr_const ((FILE), (RTX)); \
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fputc ('\n', (FILE)); \
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} \
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while (0)
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/* This is how to equate one symbol to another symbol. The syntax used is
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`SYM1=SYM2'. Note that this is different from the way equates are done
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with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'. */
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#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
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do \
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{ \
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fprintf ((FILE), "\t"); \
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assemble_name (FILE, LABEL1); \
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fprintf (FILE, " = "); \
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assemble_name (FILE, LABEL2); \
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fprintf (FILE, "\n"); \
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} \
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while (0)
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/* A list of other sections which the compiler might be "in" at any
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given time. */
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#undef EXTRA_SECTIONS
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#define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
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#define SUBTARGET_EXTRA_SECTIONS
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/* A list of extra section function definitions. */
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#undef EXTRA_SECTION_FUNCTIONS
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#define EXTRA_SECTION_FUNCTIONS \
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RDATA_SECTION_FUNCTION \
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CTORS_SECTION_FUNCTION \
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DTORS_SECTION_FUNCTION \
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SUBTARGET_EXTRA_SECTION_FUNCTIONS
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#define SUBTARGET_EXTRA_SECTION_FUNCTIONS
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#define RDATA_SECTION_FUNCTION \
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void \
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rdata_section () \
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{ \
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if (in_section != in_rdata) \
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{ \
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fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP); \
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in_section = in_rdata; \
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} \
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}
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#define CTOR_LIST_BEGIN \
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asm (CTORS_SECTION_ASM_OP); \
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func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) }
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#define CTOR_LIST_END \
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asm (CTORS_SECTION_ASM_OP); \
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func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
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#define DTOR_LIST_BEGIN \
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asm (DTORS_SECTION_ASM_OP); \
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func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) }
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#define DTOR_LIST_END \
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asm (DTORS_SECTION_ASM_OP); \
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func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
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#define CTORS_SECTION_FUNCTION \
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void \
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ctors_section () \
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{ \
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if (in_section != in_ctors) \
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{ \
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fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
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in_section = in_ctors; \
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} \
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}
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#define DTORS_SECTION_FUNCTION \
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void \
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dtors_section () \
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{ \
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if (in_section != in_dtors) \
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{ \
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fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
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in_section = in_dtors; \
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} \
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}
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/* Support the ctors/dtors sections for g++. */
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#define INT_ASM_OP ".word"
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#define INVOKE__main
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC "crtbegin%O%s crt0%O%s"
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC "crtend%O%s"
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/* A C statement (sans semicolon) to output an element in the table of
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global constructors. */
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#undef ASM_OUTPUT_CONSTRUCTOR
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#define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
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do \
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{ \
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ctors_section (); \
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fprintf (STREAM, "\t%s\t ", INT_ASM_OP); \
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assemble_name (STREAM, NAME); \
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fprintf (STREAM, "\n"); \
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} \
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while (0)
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/* A C statement (sans semicolon) to output an element in the table of
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global destructors. */
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#undef ASM_OUTPUT_DESTRUCTOR
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#define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
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do \
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{ \
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dtors_section (); \
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fprintf (STREAM, "\t%s\t ", INT_ASM_OP); \
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assemble_name (STREAM, NAME); \
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fprintf (STREAM, "\n"); \
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} \
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while (0)
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/* The ARM development system has atexit and doesn't have _exit,
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so define this for now. */
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#define HAVE_ATEXIT
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/* The ARM development system defines __main. */
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#define NAME__MAIN "__gccmain"
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#define SYMBOL__MAIN __gccmain
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#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
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#define UNIQUE_SECTION(DECL,RELOC) \
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do \
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{ \
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int len; \
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char * name, * string, * prefix; \
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\
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name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
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\
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if (! DECL_ONE_ONLY (DECL)) \
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{ \
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prefix = "."; \
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if (TREE_CODE (DECL) == FUNCTION_DECL) \
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prefix = ".text."; \
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else if (DECL_READONLY_SECTION (DECL, RELOC)) \
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prefix = ".rodata."; \
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else \
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prefix = ".data."; \
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} \
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else if (TREE_CODE (DECL) == FUNCTION_DECL) \
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prefix = ".gnu.linkonce.t."; \
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else if (DECL_READONLY_SECTION (DECL, RELOC)) \
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prefix = ".gnu.linkonce.r."; \
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else \
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prefix = ".gnu.linkonce.d."; \
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\
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len = strlen (name) + strlen (prefix); \
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string = alloca (len + 1); \
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sprintf (string, "%s%s", prefix, name); \
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\
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DECL_SECTION_NAME (DECL) = build_string (len, string); \
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} \
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while (0)
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