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- /* Target definitions for GNU compiler for Intel x86 CPU running NeXTSTEP
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- This file is part of GNU CC.
-
- GNU CC is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GNU CC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU CC; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "i386/gas.h"
- #include "nextstep.h"
-
- /* By default, target has a 80387, with IEEE FP. */
-
- #undef TARGET_DEFAULT
- #define TARGET_DEFAULT (1|0100)
-
- /* Implicit library calls should use memcpy, not bcopy, etc. */
-
- #define TARGET_MEM_FUNCTIONS
-
- /* Machines that use the AT&T assembler syntax
- also return floating point values in an FP register.
- Define how to find the value returned by a function.
- VALTYPE is the data type of the value (as a tree).
- If the precise function being called is known, FUNC is its FUNCTION_DECL;
- otherwise, FUNC is 0. */
-
- #undef VALUE_REGNO
- #define VALUE_REGNO(MODE) \
- ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode \
- ? FIRST_FLOAT_REG : 0)
-
- /* 1 if N is a possible register number for a function value. */
-
- #undef FUNCTION_VALUE_REGNO_P
- #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
-
- #ifdef REAL_VALUE_TO_TARGET_LONG_DOUBLE
- #undef ASM_OUTPUT_LONG_DOUBLE
- #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \
- do { \
- long hex[3]; \
- REAL_VALUE_TO_TARGET_LONG_DOUBLE (VALUE, hex); \
- if (sizeof (int) == sizeof (long)) \
- fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n\t.long 0x%x\n", \
- hex[0], hex[1], hex[2]); \
- else \
- fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n\t.long 0x%lx\n", \
- hex[0], hex[1], hex[2]); \
- } while (0)
- #endif
-
- #ifdef REAL_VALUE_TO_TARGET_DOUBLE
- #undef ASM_OUTPUT_DOUBLE
- #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
- do { \
- long hex[2]; \
- REAL_VALUE_TO_TARGET_DOUBLE (VALUE, hex); \
- if (sizeof (int) == sizeof (long)) \
- fprintf (FILE, "\t.long 0x%x\n\t.long 0x%x\n", hex[0], hex[1]); \
- else \
- fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n", hex[0], hex[1]); \
- } while (0)
- #endif
-
- /* This is how to output an assembler line defining a `float' constant. */
-
- #ifdef REAL_VALUE_TO_TARGET_SINGLE
- #undef ASM_OUTPUT_FLOAT
- #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
- do { \
- long hex; \
- REAL_VALUE_TO_TARGET_SINGLE (VALUE, hex); \
- if (sizeof (int) == sizeof (long)) \
- fprintf (FILE, "\t.long 0x%x\n", hex); \
- else \
- fprintf (FILE, "\t.long 0x%lx\n", hex); \
- } while (0)
- #endif
-
- /* A C statement or statements which output an assembler instruction
- opcode to the stdio stream STREAM. The macro-operand PTR is a
- variable of type `char *' which points to the opcode name in its
- "internal" form--the form that is written in the machine description.
-
- GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
- So use `repe' instead. */
-
- #undef ASM_OUTPUT_OPCODE
- #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
- { \
- if ((PTR)[0] == 'r' \
- && (PTR)[1] == 'e' \
- && (PTR)[2] == 'p') \
- { \
- if ((PTR)[3] == 'z') \
- { \
- fprintf (STREAM, "repe"); \
- (PTR) += 4; \
- } \
- else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
- { \
- fprintf (STREAM, "repne"); \
- (PTR) += 5; \
- } \
- } \
- }
-
- /* Define macro used to output shift-double opcodes when the shift
- count is in %cl. Some assemblers require %cl as an argument;
- some don't.
-
- GAS requires the %cl argument, so override unx386.h. */
-
- #undef AS3_SHIFT_DOUBLE
- #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
-
- /* Print opcodes the way that GAS expects them. */
- #define GAS_MNEMONICS 1
-
- /* Names to predefine in the preprocessor for this target machine. */
-
- #undef CPP_PREDEFINES
- #define CPP_PREDEFINES "-Di386 -DNeXT -Dunix -D__MACH__ -D__LITTLE_ENDIAN__ -D__ARCHITECTURE__=\"i386\" -Asystem(unix) -Asystem(mach) -Acpu(i386) -Amachine(i386)"
-
- /* This accounts for the return pc and saved fp on the i386. */
-
- #define OBJC_FORWARDING_STACK_OFFSET 8
- #define OBJC_FORWARDING_MIN_OFFSET 8
-
- /* We do not want a dot in internal labels. */
-
- #undef LPREFIX
- #define LPREFIX "L"
-
- #undef ASM_GENERATE_INTERNAL_LABEL
- #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
- sprintf ((BUF), "*%s%d", (PREFIX), (NUMBER))
-
- #undef ASM_OUTPUT_INTERNAL_LABEL
- #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
- fprintf (FILE, "%s%d:\n", PREFIX, NUM)
-
- /* Output to assembler file text saying following lines
- may contain character constants, extra white space, comments, etc. */
-
- #undef ASM_APP_ON
- #define ASM_APP_ON "#APP\n"
-
- /* Output to assembler file text saying following lines
- no longer contain unusual constructs. */
-
- #undef ASM_APP_OFF
- #define ASM_APP_OFF "#NO_APP\n"
-
- #undef ASM_OUTPUT_REG_PUSH
- #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
- fprintf (FILE, "\tpushl %se%s\n", "%", reg_names[REGNO])
-
- #undef ASM_OUTPUT_REG_POP
- #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
- fprintf (FILE, "\tpopl %se%s\n", "%", reg_names[REGNO])
-
- /* This is being overridden because the default i386 configuration
- generates calls to "_mcount". NeXT system libraries all use
- "mcount". */
-
- #undef FUNCTION_PROFILER
- #define FUNCTION_PROFILER(FILE, LABELNO) \
- { \
- if (flag_pic) \
- { \
- fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
- LPREFIX, (LABELNO)); \
- fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
- } \
- else \
- { \
- fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
- fprintf (FILE, "\tcall mcount\n"); \
- } \
- }
-
- /* BEGIN Calling Convention CHANGES */
-
- /* These changes violate the Intel/Unix ABI. Specifically, they
- change the way that space for a block return value is passed to a
- function. The ABI says that the pointer is passed on the stack.
- We change to pass the pointer in %ebx. This makes the NeXT
- Objective-C forwarding mechanism possible to implement on an i386. */
-
- /* Do NOT pass address of structure values on the stack. */
-
- #undef STRUCT_VALUE_INCOMING
- #undef STRUCT_VALUE
-
- /* Pass them in %ebx. */
-
- #undef STRUCT_VALUE_REGNUM
- #define STRUCT_VALUE_REGNUM 3
-
- /* Because we are passing the pointer in a register, we don't need to
- rely on the callee to pop it. */
-
- #undef RETURN_POPS_ARGS
- #define RETURN_POPS_ARGS(FUNTYPE,SIZE) \
- (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE \
- ? 0 \
- : (TARGET_RTD \
- && (TYPE_ARG_TYPES (FUNTYPE) == 0 \
- || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
- == void_type_node))) ? (SIZE) : 0)
-
- /* END Calling Convention CHANGES */
-