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Annotation of gcc/config/i386/next.h, revision 1.1

1.1     ! root        1: /* Target definitions for GNU compiler for Intel x86 CPU running NeXTSTEP
        !             2:    Copyright (C) 1993 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: #include "i386/gas.h"
        !            21: #include "nextstep.h"
        !            22: 
        !            23: /* By default, target has a 80387, with IEEE FP.  */
        !            24: 
        !            25: #undef TARGET_DEFAULT
        !            26: #define TARGET_DEFAULT  (1|0100)
        !            27: 
        !            28: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !            29: 
        !            30: #define TARGET_MEM_FUNCTIONS
        !            31: 
        !            32: /* Machines that use the AT&T assembler syntax
        !            33:    also return floating point values in an FP register.
        !            34:    Define how to find the value returned by a function.
        !            35:    VALTYPE is the data type of the value (as a tree).
        !            36:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !            37:    otherwise, FUNC is 0.  */
        !            38: 
        !            39: #undef VALUE_REGNO
        !            40: #define VALUE_REGNO(MODE) \
        !            41:   (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
        !            42: 
        !            43: /* 1 if N is a possible register number for a function value. */
        !            44: 
        !            45: #undef FUNCTION_VALUE_REGNO_P
        !            46: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
        !            47: 
        !            48: #ifdef REAL_VALUE_TO_TARGET_DOUBLE
        !            49: #undef ASM_OUTPUT_DOUBLE
        !            50: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)                                  \
        !            51:   do {                                                                 \
        !            52:     long hex[2];                                                       \
        !            53:     REAL_VALUE_TO_TARGET_DOUBLE (VALUE, hex);                          \
        !            54:     fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n", hex[0], hex[1]);    \
        !            55:   } while (0)
        !            56: #endif
        !            57: 
        !            58: /* This is how to output an assembler line defining a `float' constant.  */
        !            59: 
        !            60: #ifdef REAL_VALUE_TO_TARGET_SINGLE
        !            61: #undef ASM_OUTPUT_FLOAT
        !            62: #define ASM_OUTPUT_FLOAT(FILE,VALUE)                                   \
        !            63:   do {                                                                 \
        !            64:     long hex;                                                          \
        !            65:     REAL_VALUE_TO_TARGET_SINGLE (VALUE, hex);                          \
        !            66:     fprintf (FILE, "\t.long 0x%x\n", hex);                             \
        !            67:   } while (0)
        !            68: #endif
        !            69: 
        !            70: /* A C statement or statements which output an assembler instruction
        !            71:    opcode to the stdio stream STREAM.  The macro-operand PTR is a
        !            72:    variable of type `char *' which points to the opcode name in its
        !            73:    "internal" form--the form that is written in the machine description.
        !            74: 
        !            75:    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
        !            76:    So use `repe' instead.  */
        !            77: 
        !            78: #undef ASM_OUTPUT_OPCODE
        !            79: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
        !            80: {                                                      \
        !            81:   if ((PTR)[0] == 'r'                                  \
        !            82:       && (PTR)[1] == 'e'                               \
        !            83:       && (PTR)[2] == 'p')                              \
        !            84:     {                                                  \
        !            85:       if ((PTR)[3] == 'z')                             \
        !            86:        {                                               \
        !            87:          fprintf (STREAM, "repe");                     \
        !            88:          (PTR) += 4;                                   \
        !            89:        }                                               \
        !            90:       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')     \
        !            91:        {                                               \
        !            92:          fprintf (STREAM, "repne");                    \
        !            93:          (PTR) += 5;                                   \
        !            94:        }                                               \
        !            95:     }                                                  \
        !            96: }
        !            97: 
        !            98: /* Define macro used to output shift-double opcodes when the shift
        !            99:    count is in %cl.  Some assemblers require %cl as an argument;
        !           100:    some don't.
        !           101: 
        !           102:    GAS requires the %cl argument, so override unx386.h. */
        !           103: 
        !           104: #undef AS3_SHIFT_DOUBLE
        !           105: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
        !           106: 
        !           107: /* Print opcodes the way that GAS expects them. */
        !           108: #define GAS_MNEMONICS 1
        !           109: 
        !           110: /* Names to predefine in the preprocessor for this target machine.  */
        !           111: 
        !           112: #undef CPP_PREDEFINES
        !           113: #define CPP_PREDEFINES "-Di386 -DNeXT -Dunix -D__MACH__ -D__LITTLE_ENDIAN__ -D__ARCHITECTURE__=\"i386\""
        !           114: 
        !           115: /* This accounts for the return pc and saved fp on the i386. */
        !           116: 
        !           117: #define OBJC_FORWARDING_STACK_OFFSET 8
        !           118: #define OBJC_FORWARDING_MIN_OFFSET 8
        !           119: 
        !           120: /* We do not want a dot in internal labels.  */
        !           121: 
        !           122: #undef LPREFIX
        !           123: #define LPREFIX "L"
        !           124: 
        !           125: #undef ASM_GENERATE_INTERNAL_LABEL
        !           126: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
        !           127:     sprintf ((BUF), "*%s%d", (PREFIX), (NUMBER))
        !           128: 
        !           129: #undef ASM_OUTPUT_INTERNAL_LABEL
        !           130: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !           131:   fprintf (FILE, "%s%d:\n", PREFIX, NUM)
        !           132: 
        !           133: /* Output to assembler file text saying following lines
        !           134:    may contain character constants, extra white space, comments, etc.  */
        !           135: 
        !           136: #undef ASM_APP_ON
        !           137: #define ASM_APP_ON "#APP\n"
        !           138: 
        !           139: /* Output to assembler file text saying following lines
        !           140:    no longer contain unusual constructs.  */
        !           141: 
        !           142: #undef ASM_APP_OFF
        !           143: #define ASM_APP_OFF "#NO_APP\n"
        !           144: 
        !           145: #undef ASM_OUTPUT_REG_PUSH
        !           146: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
        !           147:   fprintf (FILE, "\tpushl %se%s\n", "%", reg_names[REGNO])
        !           148: 
        !           149: #undef ASM_OUTPUT_REG_POP
        !           150: #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
        !           151:   fprintf (FILE, "\tpopl %se%s\n", "%", reg_names[REGNO])
        !           152: 
        !           153: /* This is being overridden because the default i386 configuration
        !           154:    generates calls to "_mcount".  NeXT system libraries all use
        !           155:    "mcount".  */
        !           156: 
        !           157: #undef FUNCTION_PROFILER
        !           158: #define FUNCTION_PROFILER(FILE, LABELNO)                               \
        !           159: {                                                                      \
        !           160:   if (flag_pic)                                                                \
        !           161:     {                                                                  \
        !           162:       fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",             \
        !           163:                LPREFIX, (LABELNO));                                    \
        !           164:       fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n");                   \
        !           165:     }                                                                  \
        !           166:   else                                                                 \
        !           167:     {                                                                  \
        !           168:       fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));     \
        !           169:       fprintf (FILE, "\tcall mcount\n");                               \
        !           170:     }                                                                  \
        !           171: }
        !           172: 
        !           173: /* BEGIN Calling Convention CHANGES */
        !           174: 
        !           175: /* These changes violate the Intel/Unix ABI.  Specifically, they
        !           176:    change the way that space for a block return value is passed to a
        !           177:    function.  The ABI says that the pointer is passed on the stack.
        !           178:    We change to pass the pointer in %ebx.  This makes the NeXT
        !           179:    Objective-C forwarding mechanism possible to implement on an i386.  */
        !           180: 
        !           181: /* Do NOT pass address of structure values on the stack.  */
        !           182: 
        !           183: #undef STRUCT_VALUE_INCOMING
        !           184: #undef STRUCT_VALUE
        !           185: 
        !           186: /* Pass them in %ebx.  */
        !           187: 
        !           188: #undef STRUCT_VALUE_REGNUM
        !           189: #define STRUCT_VALUE_REGNUM 3
        !           190: 
        !           191: /* Because we are passing the pointer in a register, we don't need to
        !           192:    rely on the callee to pop it.  */
        !           193: 
        !           194: #undef RETURN_POPS_ARGS
        !           195: #define RETURN_POPS_ARGS(FUNTYPE,SIZE)                                 \
        !           196:   (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE                      \
        !           197:    ? 0                                                         \
        !           198:    : (TARGET_RTD                                               \
        !           199:       && (TYPE_ARG_TYPES (FUNTYPE) == 0                                \
        !           200:           || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE)))        \
        !           201:               == void_type_node))) ? (SIZE) : 0)
        !           202: 
        !           203: /* END Calling Convention CHANGES */

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