1 /* m68kelf support, derived from m68kv4.h */ 2 3 /* Target definitions for GNU compiler for mc680x0 running System V.4 4 Copyright (C) 1991-2013 Free Software Foundation, Inc. 5 6 Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com). 7 8 This file is part of GCC. 9 10 GCC is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3, or (at your option) 13 any later version. 14 15 GCC is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along 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) \ 73 do { \ 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