gcc/config/i386/unix.h

   1 /* Definitions for Unix assembler syntax for the Intel 80386.
   2    Copyright (C) 1988, 1994, 1999, 2000 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, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* This file defines the aspects of assembler syntax
  22    that are the same for all the i386 Unix systems
  23    (though they may differ in non-Unix systems).  */
  24
  25 #define DEFAULT_ASSEMBLER_DIALECT 0
  26
  27 /* Define macro used to output shift-double opcodes when the shift
  28    count is in %cl.  Some assemblers require %cl as an argument;
  29    some don't.  This macro controls what to do: by default, don't
  30    print %cl.  */
  31 #define SHIFT_DOUBLE_OMITS_COUNT 1
  32 \f
  33 /* Define the syntax of pseudo-ops, labels and comments.  */
  34
  35 /* String containing the assembler's comment-starter.  */
  36
  37 #define ASM_COMMENT_START "/"
  38
  39 /* Output to assembler file text saying following lines
  40    may contain character constants, extra white space, comments, etc.  */
  41
  42 #define ASM_APP_ON "/APP\n"
  43
  44 /* Output to assembler file text saying following lines
  45    no longer contain unusual constructs.  */
  46
  47 #define ASM_APP_OFF "/NO_APP\n"
  48
  49 /* Output before read-only data.  */
  50
  51 #define TEXT_SECTION_ASM_OP "\t.text"
  52
  53 /* Output before writable (initialized) data.  */
  54
  55 #define DATA_SECTION_ASM_OP "\t.data"
  56
  57 /* Output before writable (uninitialized) data.  */
  58
  59 #define BSS_SECTION_ASM_OP "\t.bss"
  60
  61 /* This is how to output a command to make the user-level label named NAME
  62    defined for reference from other files.  */
  63
  64 #define ASM_GLOBALIZE_LABEL(FILE,NAME)  \
  65   (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
  66
  67 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  68    and returns float values in the 387.  */
  69
  70 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
  71
  72 /* Floating-point return values come in the FP register.  */
  73
  74 #define VALUE_REGNO(MODE) \
  75   (GET_MODE_CLASS (MODE) == MODE_FLOAT                          \
  76    && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG           \
  77    : (MODE) == TImode || VECTOR_MODE_P (MODE) ? FIRST_SSE_REG   \
  78    : 0)
  79
  80 /* 1 if N is a possible register number for a function value. */
  81
  82 #define FUNCTION_VALUE_REGNO_P(N) \
  83   ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
  84
  85 /* Output code to add DELTA to the first argument, and then jump to FUNCTION.
  86    Used for C++ multiple inheritance.  */
  87 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION)            \
  88 do {                                                                        \
  89   tree parm;                                                                \
  90   rtx xops[2];                                                              \
  91                                                                             \
  92   if (ix86_regparm > 0)                                                     \
  93     parm = TYPE_ARG_TYPES (TREE_TYPE (function));                           \
  94   else                                                                      \
  95     parm = NULL_TREE;                                                       \
  96   for (; parm; parm = TREE_CHAIN (parm))                                    \
  97     if (TREE_VALUE (parm) == void_type_node)                                \
  98       break;                                                                \
  99                                                                             \
 100   xops[0] = GEN_INT (DELTA);                                                \
 101   if (parm)                                                                 \
 102     xops[1] = gen_rtx_REG (SImode, 0);                                      \
 103   else if (aggregate_value_p (TREE_TYPE (TREE_TYPE (FUNCTION))))            \
 104     xops[1] = gen_rtx_MEM (SImode, plus_constant (stack_pointer_rtx, 8));   \
 105   else                                                                      \
 106     xops[1] = gen_rtx_MEM (SImode, plus_constant (stack_pointer_rtx, 4));   \
 107   output_asm_insn ("add{l} {%0, %1|%1, %0}", xops);                         \
 108                                                                             \
 109   if (flag_pic && !TARGET_64BIT)                                            \
 110     {                                                                       \
 111       xops[0] = pic_offset_table_rtx;                                       \
 112       xops[1] = gen_label_rtx ();                                           \
 113                                                                             \
 114       if (ix86_regparm > 2)                                                 \
 115         abort ();                                                           \
 116       output_asm_insn ("push{l}\t%0", xops);                                \
 117       output_asm_insn ("call\t%P1", xops);                                  \
 118       ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", CODE_LABEL_NUMBER (xops[1]));   \
 119       output_asm_insn ("pop{l}\t%0", xops);                                 \
 120       output_asm_insn ("add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-%P1], %0|%0, OFFSET FLAT: _GLOBAL_OFFSET_TABLE_+[.-%P1]}", xops); \
 121       xops[0] = gen_rtx_MEM (SImode, XEXP (DECL_RTL (FUNCTION), 0));        \
 122       output_asm_insn ("mov{l}\t{%0@GOT(%%ebx), %%ecx|%%ecx, %0@GOT[%%ebx]}",\
 123                        xops);                                               \
 124       asm_fprintf (FILE, "\tpop{l\t%%ebx|\t%%ebx}\n");                      \
 125       asm_fprintf (FILE, "\tjmp\t{*%%ecx|%%ecx}\n");                        \
 126     }                                                                       \
 127   else if (flag_pic && TARGET_64BIT)                                        \
 128     {                                                                       \
 129       fprintf (FILE, "\tjmp *");                                            \
 130       assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));        \
 131       fprintf (FILE, "@GOTPCREL(%%RIP)\n");                                 \
 132     }                                                                       \
 133   else                                                                      \
 134     {                                                                       \
 135       fprintf (FILE, "\tjmp ");                                             \
 136       assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));        \
 137       fprintf (FILE, "\n");                                                 \
 138     }                                                                       \
 139 } while (0)