1/* m68kelf support, derived from m68kv4.h */ 2 3/* Target definitions for GNU compiler for mc680x0 running System V.4 4 Copyright (C) 1991-2015 Free Software Foundation, Inc. 5 6 Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com). 7 8This file is part of GCC. 9 10GCC is free software; you can redistribute it and/or modify 11it under the terms of the GNU General Public License as published by 12the Free Software Foundation; either version 3, or (at your option) 13any later version. 14 15GCC is distributed in the hope that it will be useful, 16but WITHOUT ANY WARRANTY; without even the implied warranty of 17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18GNU General Public License for more details. 19 20You should have received a copy of the GNU General Public License 21along with GCC; see the file COPYING3. If not see 22<http://www.gnu.org/licenses/>. */ 23 24 25#ifndef SWBEG_ASM_OP 26#define SWBEG_ASM_OP "\t.swbeg\t" 27#endif 28 29/* Here are three prefixes that are used by asm_fprintf to 30 facilitate customization for alternate assembler syntaxes. 31 Machines with no likelihood of an alternate syntax need not 32 define these and need not use asm_fprintf. */ 33 34/* The prefix for register names. Note that REGISTER_NAMES 35 is supposed to include this prefix. Also note that this is NOT an 36 fprintf format string, it is a literal string */ 37 38#undef REGISTER_PREFIX 39#define REGISTER_PREFIX "%" 40 41/* The prefix for local (compiler generated) labels. 42 These labels will not appear in the symbol table. */ 43 44#undef LOCAL_LABEL_PREFIX 45#define LOCAL_LABEL_PREFIX "." 46 47/* The prefix to add to user-visible assembler symbols. */ 48 49#undef USER_LABEL_PREFIX 50#define USER_LABEL_PREFIX "" 51 52/* config/m68k.md has an explicit reference to the program counter, 53 prefix this by the register prefix. */ 54 55#define ASM_RETURN_CASE_JUMP \ 56 do { \ 57 if (TARGET_COLDFIRE) \ 58 { \ 59 if (ADDRESS_REG_P (operands[0])) \ 60 return "jmp %%pc@(2,%0:l)"; \ 61 else \ 62 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \ 63 } \ 64 else \ 65 return "jmp %%pc@(2,%0:w)"; \ 66 } while (0) 67 68/* This is how to output an assembler line that says to advance the 69 location counter to a multiple of 2**LOG bytes. */ 70 71#undef ASM_OUTPUT_ALIGN 72#define ASM_OUTPUT_ALIGN(FILE,LOG) \ 73do { \ 74 if ((LOG) > 0) \ 75 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \ 76} while (0) 77 78/* Register in which address to store a structure value is passed to a 79 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */ 80 81#undef M68K_STRUCT_VALUE_REGNUM 82#define M68K_STRUCT_VALUE_REGNUM A0_REG 83 84/* The static chain regnum defaults to a0, but we use that for 85 structure return, so have to use a1 for the static chain. */ 86 87#undef STATIC_CHAIN_REGNUM 88#define STATIC_CHAIN_REGNUM A1_REG 89#undef M68K_STATIC_CHAIN_REG_NAME 90#define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1" 91 92#define ASM_COMMENT_START "|" 93 94/* Define how the m68k registers should be numbered for Dwarf output. 95 The numbering provided here should be compatible with the native 96 SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7 97 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */ 98 99#undef DBX_REGISTER_NUMBER 100#define DBX_REGISTER_NUMBER(REGNO) (REGNO) 101 102#if 0 103/* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for 104 1 byte alignment. Don't generate alignment for COMMON seems to be 105 safer until we the assembler is fixed. */ 106#undef ASM_OUTPUT_ALIGNED_COMMON 107/* Same problem with this one. */ 108#undef ASM_OUTPUT_ALIGNED_LOCAL 109#endif 110 111#undef ASM_OUTPUT_COMMON 112#undef ASM_OUTPUT_LOCAL 113#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 114( fputs (".comm ", (FILE)), \ 115 assemble_name ((FILE), (NAME)), \ 116 fprintf ((FILE), ",%u\n", (int)(SIZE))) 117 118#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 119( fputs (".lcomm ", (FILE)), \ 120 assemble_name ((FILE), (NAME)), \ 121 fprintf ((FILE), ",%u\n", (int)(SIZE))) 122 123/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to 124 keep switch tables in the text section. */ 125 126#define JUMP_TABLES_IN_TEXT_SECTION 1 127 128/* In m68k svr4, using swbeg is the standard way to do switch 129 table. */ 130#undef ASM_OUTPUT_BEFORE_CASE_LABEL 131#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \ 132 fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1)); 133/* end of stuff from m68kv4.h */ 134 135#undef ENDFILE_SPEC 136#define ENDFILE_SPEC "crtend.o%s" 137 138#undef STARTFILE_SPEC 139#define STARTFILE_SPEC "crtbegin.o%s" 140 141#ifndef BSS_SECTION_ASM_OP 142#define BSS_SECTION_ASM_OP "\t.section\t.bss" 143#endif 144 145#ifndef ASM_OUTPUT_ALIGNED_BSS 146#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 147 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 148#endif 149