371 lines
13 KiB
C
Executable File
371 lines
13 KiB
C
Executable File
/* CYGNUS LOCAL (entire file) clm/arm-elf */
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/* 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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#include "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 DWARF2_DEBUGGING_INFO
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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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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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} 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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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 if (0 == strncmp((NAME), ".bss", sizeof(".bss") - 1)) \
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fprintf (STREAM, "\t.section %s,\"aw\",%%nobits\n", (NAME)); \
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else \
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fprintf (STREAM, "\t.section %s,\"aw\"\n", (NAME)); \
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} while (0)
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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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/* If defined, a C expression whose value is a string containing the
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assembler operation to identify the following data as
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uninitialized global data. If not defined, and neither
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`ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
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uninitialized global data will be output in the data section if
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`-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
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used. */
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#ifndef BSS_SECTION_ASM_OP
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#define BSS_SECTION_ASM_OP ".section\t.bss"
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#endif
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/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
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separate, explicit argument. If you define this macro, it is used
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in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
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handling the required alignment of the variable. The alignment is
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specified as the number of bits.
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Try to use function `asm_output_aligned_bss' defined in file
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`varasm.c' when defining this macro. */
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#ifndef ASM_OUTPUT_ALIGNED_BSS
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#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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#endif
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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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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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} 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 { 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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} while (0)
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/* For aliases of functions we use .thumb_set instead. */
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#define ASM_OUTPUT_DEF_FROM_DECLS(FILE,DECL1,DECL2) \
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do \
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{ \
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char * LABEL1 = XSTR (XEXP (DECL_RTL (decl), 0), 0); \
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char * LABEL2 = IDENTIFIER_POINTER (DECL2); \
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\
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if (TREE_CODE (DECL1) == FUNCTION_DECL) \
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{ \
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fprintf (FILE, "\t.thumb_set "); \
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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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else \
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ASM_OUTPUT_DEF (FILE, LABEL1, LABEL2); \
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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 in_rdata
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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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#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 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 expression whose value is nonzero if IDENTIFIER with arguments ARGS
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is a valid machine specific attribute for DECL.
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The attributes in ATTRIBUTES have previously been assigned to DECL. */
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extern int arm_valid_machine_decl_attribute(tree decl, tree attributes, tree attr, tree args);
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#define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
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arm_valid_machine_decl_attribute(DECL, ATTRIBUTES, IDENTIFIER, ARGS)
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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 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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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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} while (0)
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/* This is how we tell the assembler that a symbol is weak. */
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#ifndef ASM_WEAKEN_LABEL
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#define ASM_WEAKEN_LABEL(FILE, NAME) \
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do \
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{ \
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fputs ("\t.weak\t", FILE); \
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assemble_name (FILE, NAME); \
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fputc ('\n', FILE); \
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} \
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while (0)
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#endif
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#ifndef TYPE_ASM_OP
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/* These macros generate the special .type and .size directives which
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are used to set the corresponding fields of the linker symbol table
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entries in an ELF object file under SVR4. These macros also output
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the starting labels for the relevant functions/objects. */
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#define TYPE_ASM_OP ".type"
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#define SIZE_ASM_OP ".size"
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/* The following macro defines the format used to output the second
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operand of the .type assembler directive. Different svr4 assemblers
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expect various different forms for this operand. The one given here
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is just a default. You may need to override it in your machine-
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specific tm.h file (depending upon the particulars of your assembler). */
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#define TYPE_OPERAND_FMT "%s"
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/* Write the extra assembler code needed to declare a function's result.
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Most svr4 assemblers don't require any special declaration of the
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result value, but there are exceptions. */
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#ifndef ASM_DECLARE_RESULT
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#define ASM_DECLARE_RESULT(FILE, RESULT)
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#endif
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/* Write the extra assembler code needed to declare a function properly.
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Some svr4 assemblers need to also have something extra said about the
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function's return value. We allow for that here. */
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#undef ASM_DECLARE_FUNCTION_NAME
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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do \
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{ \
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fprintf (FILE, "\t%s\t ", 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, "function"); \
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putc ('\n', FILE); \
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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fprintf (FILE, "\t.thumb_func\n") ; \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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} \
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while (0)
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/* Write the extra assembler code needed to declare an object properly. */
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#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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do \
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{ \
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fprintf (FILE, "\t%s\t ", 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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size_directive_output = 0; \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, NAME); \
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putc (',', FILE); \
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fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
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int_size_in_bytes (TREE_TYPE (DECL))); \
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fputc ('\n', FILE); \
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} \
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ASM_OUTPUT_LABEL(FILE, NAME); \
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} \
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while (0)
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/* Output the size directive for a decl in rest_of_decl_compilation
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in the case where we did not do so before the initializer.
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Once we find the error_mark_node, we know that the value of
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size_directive_output was set
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by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
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#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
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do \
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{ \
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char * name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
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&& ! AT_END && TOP_LEVEL \
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&& DECL_INITIAL (DECL) == error_mark_node \
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&& !size_directive_output) \
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{ \
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size_directive_output = 1; \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, name); \
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putc (',', FILE); \
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fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
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int_size_in_bytes (TREE_TYPE (DECL))); \
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fputc ('\n', FILE); \
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} \
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} \
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while (0)
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/* This is how to declare the size of a function. */
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#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
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do \
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{ \
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if (!flag_inhibit_size_directive) \
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{ \
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char label[256]; \
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static int labelno; \
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labelno ++; \
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ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
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ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
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fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
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assemble_name (FILE, (FNAME)); \
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fprintf (FILE, ","); \
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assemble_name (FILE, label); \
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fprintf (FILE, "-"); \
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assemble_name (FILE, (FNAME)); \
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putc ('\n', FILE); \
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} \
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} \
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while (0)
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#endif /* TYPE_ASM_OP */
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// Allow alignment up to 16 bytes.
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#define MAX_OFILE_ALIGNMENT (16 * 8)
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