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1.1 root 1: /* Target definitions for GNU compiler for mc680x0 running System V.4 1.1.1.3 ! root 2: Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc. 1.1 root 3: 1.1.1.3 ! root 4: Written by Ron Guilmette ([email protected]) and Fred Fish ([email protected]). 1.1 root 5: 6: This file is part of GNU CC. 7: 8: GNU CC is free software; you can redistribute it and/or modify 9: it under the terms of the GNU General Public License as published by 10: the Free Software Foundation; either version 2, or (at your option) 11: any later version. 12: 13: GNU CC is distributed in the hope that it will be useful, 14: but WITHOUT ANY WARRANTY; without even the implied warranty of 15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16: GNU General Public License for more details. 17: 18: You should have received a copy of the GNU General Public License 19: along with GNU CC; see the file COPYING. If not, write to 20: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ 21: 22: /* Use SGS_* macros to control compilation in m68k.md */ 23: 24: #define SGS_SWITCH_TABLES /* Different switch table handling */ 25: 26: #include "m68k/sgs.h" /* The m68k/SVR4 assembler is SGS based */ 1.1.1.3 ! root 27: ! 28: /* The SGS assembler requires a special definition of ! 29: ASM_IDENTIFY_GCC. We combine the m68k/sgs.h and the svr4.h ! 30: definitions below. */ ! 31: #undef ASM_IDENTIFY_GCC ! 32: 1.1 root 33: #include "svr4.h" /* Pick up the generic SVR4 macros */ 34: 35: /* See m68k.h. 7 means 68020 with 68881. */ 36: 37: #ifndef TARGET_DEFAULT 38: #define TARGET_DEFAULT (5 /*68020*/ + 2 /*68881*/) 39: #endif 40: 1.1.1.3 ! root 41: /* When using an SGS assembler, modify the name of the artificial label which ! 42: identifies this file as having been compiled with gcc, and the macro that ! 43: emits such a label in the assembly output, to use '%' rather than '.' */ ! 44: ! 45: #undef ASM_IDENTIFY_GCC ! 46: #define ASM_IDENTIFY_GCC(FILE) \ ! 47: do \ ! 48: { \ ! 49: if (write_symbols != DBX_DEBUG) \ ! 50: fputs ("gcc2_compiled%:\n", FILE); \ ! 51: } \ ! 52: while (0) ! 53: 1.1 root 54: /* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special 55: g++ assembler names. When this is defined, g++ uses embedded '.' 56: characters and some m68k assemblers have problems with this. The 57: chances are much greater that any particular assembler will permit 58: embedded '$' characters. */ 59: 60: #undef NO_DOLLAR_IN_LABEL 61: 62: /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine 63: is to use the nonreentrant technique for returning structure and union 64: values, as commonly implemented by the AT&T Portable C Compiler (PCC). 65: When defined, the gcc option -fpcc-struct-return can be used to cause 66: this form to be generated. When undefined, the option does nothing. 67: For m68k SVR4, the convention is to use a reentrant technique compatible 68: with the gcc default, so override the definition of this macro in m68k.h */ 69: 70: #undef PCC_STATIC_STRUCT_RETURN 71: 72: /* Provide a set of pre-definitions and pre-assertions appropriate for 73: the m68k running svr4. __svr4__ is our extension. */ 74: 75: #define CPP_PREDEFINES \ 1.1.1.2 root 76: "-Dm68k -Dunix -D__svr4__ -D__motorola__ \ 77: -Asystem(unix) -Asystem(svr4) -Acpu(m68k) -Amachine(m68k)" 1.1 root 78: 79: /* Test to see if the target includes a 68881 by default, and use CPP_SPEC 80: to control whether or not __HAVE_68881__ is defined by default or not. 81: If a 68881 is the default, gcc will use inline 68881 instructions, by 82: predefining __HAVE_68881__, unless -msoft-float is specified. 83: If a 68881 is not the default, gcc will only define __HAVE_68881__ if 84: -m68881 is specified. */ 85: 86: #if TARGET_DEFAULT & 2 87: #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}" 88: #else 89: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}" 90: #endif 91: 92: /* Output assembler code to FILE to increment profiler label # LABELNO 93: for profiling a function entry. We override the definition in m68k.h 94: and match the way the native m68k/SVR4 compiler does profiling, with the 95: address of the profile counter in a1, not a0, and using bsr rather 96: than jsr. */ 97: 98: #undef FUNCTION_PROFILER 99: #define FUNCTION_PROFILER(FILE, LABELNO) \ 100: asm_fprintf ((FILE), "\tlea.l\t(%LLP%d,%Rpc),%Ra1\n\tbsr\t_mcount\n", \ 101: (LABELNO)) 102: 103: /* Local common symbols are declared to the assembler with ".lcomm" rather 104: than ".bss", so override the definition in svr4.h */ 105: 106: #undef BSS_ASM_OP 107: #define BSS_ASM_OP ".lcomm" 108: 109: /* Register in which address to store a structure value is passed to a 110: function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */ 111: 112: #undef STRUCT_VALUE_REGNUM 113: #define STRUCT_VALUE_REGNUM 8 114: 115: #define ASM_COMMENT_START "#" 116: 117: #undef TYPE_OPERAND_FMT 118: #define TYPE_OPERAND_FMT "@%s" 119: 120: /* Define how the m68k registers should be numbered for Dwarf output. 121: The numbering provided here should be compatible with the native 122: SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7 123: are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */ 124: 125: #define DBX_REGISTER_NUMBER(REGNO) (REGNO) 126: 127: /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip". 128: It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h 129: to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the 130: definition from m68k/sgs.h here. Note that ASM_NO_SKIP_IN_TEXT is 131: defined in m68k/sgs.h, so we don't have to repeat it here. */ 132: 133: #undef ASM_OUTPUT_SKIP 134: #define ASM_OUTPUT_SKIP(FILE,SIZE) \ 135: fprintf (FILE, "\t%s %u\n", SPACE_ASM_OP, (SIZE)) 136: 137: /* 1 if N is a possible register number for a function value. 138: For m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, 139: pointer, or floating types, respectively. Reject fp0 if not using a 140: 68881 coprocessor. */ 141: 142: #undef FUNCTION_VALUE_REGNO_P 143: #define FUNCTION_VALUE_REGNO_P(N) \ 144: ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16)) 145: 146: /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for 147: more than one register. */ 148: 149: #undef NEEDS_UNTYPED_CALL 150: #define NEEDS_UNTYPED_CALL 1 151: 152: /* Define how to generate (in the callee) the output value of a function 153: and how to find (in the caller) the value returned by a function. VALTYPE 154: is the data type of the value (as a tree). If the precise function being 155: called is known, FUNC is its FUNCTION_DECL; otherwise, FUNC is 0. 156: For m68k/SVR4 generate the result in d0, a0, or fp0 as appropriate. */ 157: 158: #undef FUNCTION_VALUE 159: #define FUNCTION_VALUE(VALTYPE, FUNC) \ 160: (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \ 161: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16) \ 162: : (TREE_CODE (VALTYPE) == POINTER_TYPE \ 163: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8) \ 164: : gen_rtx (REG, TYPE_MODE (VALTYPE), 0))) 165: 166: /* For compatibility with the large body of existing code which does not 167: always properly declare external functions returning pointer types, the 168: m68k/SVR4 convention is to copy the value returned for pointer functions 169: from a0 to d0 in the function epilogue, so that callers that have 170: neglected to properly declare the callee can still find the correct return 171: value. */ 172: 173: extern int current_function_returns_pointer; 174: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \ 175: do { \ 176: if ((current_function_returns_pointer) && \ 177: ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \ 178: asm_fprintf (FILE, "\tmov.l %Ra0,%Rd0\n"); \ 179: } while (0); 180: 181: /* Define how to find the value returned by a library function assuming the 182: value has mode MODE. 183: For m68k/SVR4 look for integer values in d0, pointer values in d0 184: (returned in both d0 and a0), and floating values in fp0. */ 185: 186: #undef LIBCALL_VALUE 187: #define LIBCALL_VALUE(MODE) \ 188: (((MODE) == SFmode || (MODE) == DFmode) && TARGET_68881 \ 189: ? gen_rtx (REG, (MODE), 16) \ 190: : gen_rtx (REG, (MODE), 0)) 191: 192: /* Boundary (in *bits*) on which stack pointer should be aligned. 193: The m68k/SVR4 convention is to keep the stack pointer longword aligned. */ 194: 195: #undef STACK_BOUNDARY 196: #define STACK_BOUNDARY 32 197: 198: /* Alignment of field after `int : 0' in a structure. 199: For m68k/SVR4, this is the next longword boundary. */ 200: 201: #undef EMPTY_FIELD_BOUNDARY 202: #define EMPTY_FIELD_BOUNDARY 32 203: 204: /* No data type wants to be aligned rounder than this. 205: For m68k/SVR4, some types (doubles for example) are aligned on 8 byte 206: boundaries */ 207: 208: #undef BIGGEST_ALIGNMENT 209: #define BIGGEST_ALIGNMENT 64 210: 211: /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for 212: 1 byte alignment. Don't generate alignment for COMMON seems to be 213: safer until we the assembler is fixed. */ 214: #undef ASM_OUTPUT_ALIGNED_COMMON 215: /* Same problem with this one. */ 216: #undef ASM_OUTPUT_ALIGNED_LOCAL 217: 218: /* The `string' directive on m68k svr4 does not handle string with 219: escape char (ie., `\') right. Use normal way to output ASCII bytes 220: seems to be safer. */ 221: #undef ASM_OUTPUT_ASCII 222: #define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \ 1.1.1.3 ! root 223: do { \ 1.1 root 224: register int sp = 0, lp = 0, ch; \ 225: fprintf ((FILE), "\t%s ", BYTE_ASM_OP); \ 226: do { \ 227: ch = (PTR)[sp]; \ 228: if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \ 229: { \ 230: fprintf ((FILE), "'%c", ch); \ 231: } \ 232: else \ 233: { \ 234: fprintf ((FILE), "0x%x", ch); \ 235: } \ 236: if (++sp < (LEN)) \ 237: { \ 238: if ((sp % 10) == 0) \ 239: { \ 240: fprintf ((FILE), "\n\t%s ", BYTE_ASM_OP); \ 241: } \ 242: else \ 243: { \ 244: putc (',', (FILE)); \ 245: } \ 246: } \ 247: } while (sp < (LEN)); \ 248: putc ('\n', (FILE)); \ 1.1.1.3 ! root 249: } while (0) 1.1 root 250: 251: /* SVR4 m68k assembler is bitching on the syntax `2.b'. 252: So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */ 253: 254: #undef ASM_OUTPUT_CASE_END 255: #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \ 256: do { \ 257: if (switch_table_difference_label_flag) \ 258: asm_fprintf ((FILE), "\t%s %LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM));\ 259: switch_table_difference_label_flag = 0; \ 260: } while (0) 261: 262: int switch_table_difference_label_flag; 263: 264: #undef ASM_OUTPUT_COMMON 265: #undef ASM_OUTPUT_LOCAL 266: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 267: ( fputs (".comm ", (FILE)), \ 268: assemble_name ((FILE), (NAME)), \ 269: fprintf ((FILE), ",%u\n", (SIZE))) 270: 271: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 272: ( fputs (".lcomm ", (FILE)), \ 273: assemble_name ((FILE), (NAME)), \ 274: fprintf ((FILE), ",%u\n", (SIZE))) 275: 276: /* Override the definition in svr4.h. In m68k svr4, using swbeg is the 277: standard way to do switch table. */ 278: #undef ASM_OUTPUT_BEFORE_CASE_LABEL 279: #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \ 280: fprintf ((FILE), "\t%s &%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1)); 281: 282: /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an 283: operand of a function call. */ 284: #undef LEGITIMATE_PIC_OPERAND_P 285: #define LEGITIMATE_PIC_OPERAND_P(X) \ 286: (! symbolic_operand (X, VOIDmode) \ 287: || ((GET_CODE(X) == SYMBOL_REF) && SYMBOL_REF_FLAG(X))) 288: 289: /* Turn off function cse if we are doing PIC. We always want function call 290: to be done as `bsr foo@PLTPC', so it will force the assembler to create 291: the PLT entry for `foo'. Doing function cse will cause the address of `foo' 292: to be loaded into a register, which is exactly what we want to avoid when 293: we are doing PIC on svr4 m68k. */ 294: #undef OVERRIDE_OPTIONS 295: #define OVERRIDE_OPTIONS \ 296: { \ 297: if (flag_pic) flag_no_function_cse = 1; \ 298: if (! TARGET_68020 && flag_pic == 2) \ 299: error("-fPIC is not currently supported on the 68000 or 68010\n"); \ 300: }
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