1 /* m68kelf support, derived from m68kv4.h */ 2 3 /* Target definitions for GNU compiler for mc680x0 running System V.4 4 Copyright (C) 1991-2018 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 if (TARGET_LONG_JUMP_TABLE_OFFSETS) \ 62 return "jmp %%pc@(2,%0:l)"; \ 63 else \ 64 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \ 65 } \ 66 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \ 67 return "jmp %%pc@(2,%0:l)"; \ 68 else \ 69 return "jmp %%pc@(2,%0:w)"; \ 70 } while (0) 71 72 /* This is how to output an assembler line that says to advance the 73 location counter to a multiple of 2**LOG bytes. */ 74 75 #undef ASM_OUTPUT_ALIGN 76 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 77 do { \ 78 if ((LOG) > 0) \ 79 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \ 80 } while (0) 81 82 /* Register in which address to store a structure value is passed to a 83 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */ 84 85 #undef M68K_STRUCT_VALUE_REGNUM 86 #define M68K_STRUCT_VALUE_REGNUM A0_REG 87 88 /* The static chain regnum defaults to a0, but we use that for 89 structure return, so have to use a1 for the static chain. */ 90 91 #undef STATIC_CHAIN_REGNUM 92 #define STATIC_CHAIN_REGNUM A1_REG 93 #undef M68K_STATIC_CHAIN_REG_NAME 94 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1" 95 96 #define ASM_COMMENT_START "|" 97 98 /* Define how the m68k registers should be numbered for Dwarf output. 99 The numbering provided here should be compatible with the native 100 SVR4 debugger in the m68k/SVR4 reference port, where d0-d7 101 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */ 102 103 #undef DBX_REGISTER_NUMBER 104 #define DBX_REGISTER_NUMBER(REGNO) (REGNO) 105 106 #if 0 107 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for 108 1 byte alignment. Don't generate alignment for COMMON seems to be 109 safer until we the assembler is fixed. */ 110 #undef ASM_OUTPUT_ALIGNED_COMMON 111 /* Same problem with this one. */ 112 #undef ASM_OUTPUT_ALIGNED_LOCAL 113 #endif 114 115 #undef ASM_OUTPUT_COMMON 116 #undef ASM_OUTPUT_LOCAL 117 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 118 ( fputs (".comm ", (FILE)), \ 119 assemble_name ((FILE), (NAME)), \ 120 fprintf ((FILE), ",%u\n", (int)(SIZE))) 121 122 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 123 ( fputs (".lcomm ", (FILE)), \ 124 assemble_name ((FILE), (NAME)), \ 125 fprintf ((FILE), ",%u\n", (int)(SIZE))) 126 127 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to 128 keep switch tables in the text section. */ 129 130 #define JUMP_TABLES_IN_TEXT_SECTION 1 131 132 /* In m68k svr4, using swbeg is the standard way to do switch 133 table. */ 134 #undef ASM_OUTPUT_BEFORE_CASE_LABEL 135 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \ 136 fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1)) 137 /* end of stuff from m68kv4.h */ 138 139 #undef ENDFILE_SPEC 140 #define ENDFILE_SPEC "crtend.o%s" 141 142 #undef STARTFILE_SPEC 143 #define STARTFILE_SPEC "crtbegin.o%s" 144 145 #ifndef BSS_SECTION_ASM_OP 146 #define BSS_SECTION_ASM_OP "\t.section\t.bss" 147 #endif 148 149 #ifndef ASM_OUTPUT_ALIGNED_BSS 150 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 151 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 152 #endif 153