unix.h revision 52284 
1/* Definitions for Unix assembler syntax for the Intel 80386.
2   Copyright (C) 1988, 1994, 1999 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, 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 some concatenation macros to concatenate an opcode
26   and one, two or three operands.  In other assembler syntaxes
27   they may alter the order of ther operands.  */
28
29/* Note that the other files fail to use these
30   in some of the places where they should.  */
31
32#if defined(__STDC__) || defined(ALMOST_STDC)
33#define AS2(a,b,c) #a " " #b "," #c
34#define AS2C(b,c) " " #b "," #c
35#define AS3(a,b,c,d) #a " " #b "," #c "," #d
36#define AS1(a,b) #a " " #b
37#else
38#define AS1(a,b) "a b"
39#define AS2(a,b,c) "a b,c"
40#define AS2C(b,c) " b,c"
41#define AS3(a,b,c,d) "a b,c,d"
42#endif
43
44/* Define macro used to output shift-double opcodes when the shift
45   count is in %cl.  Some assemblers require %cl as an argument;
46   some don't.  This macro controls what to do: by default, don't
47   print %cl.  */
48#define SHIFT_DOUBLE_OMITS_COUNT 1
49#define AS3_SHIFT_DOUBLE(a,b,c,d) \
50	(SHIFT_DOUBLE_OMITS_COUNT ? AS2 (a,c,d) : AS3 (a,b,c,d))
51
52/* Output the size-letter for an opcode.
53   CODE is the letter used in an operand spec (L, B, W, S or Q).
54   CH is the corresponding lower case letter
55     (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS).  */
56#define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
57
58/* Opcode suffix for fullword insn.  */
59#define L_SIZE "l"
60
61/* Prefix for register names in this syntax.  */
62#define RP "%"
63
64/* Prefix for immediate operands in this syntax.  */
65#define IP "$"
66
67/* Indirect call instructions should use `*'.  */
68#define USE_STAR 1
69
70/* Prefix for a memory-operand X.  */
71#define PRINT_PTR(X, FILE)
72
73/* Delimiters that surround base reg and index reg.  */
74#define ADDR_BEG(FILE) putc('(', (FILE))
75#define ADDR_END(FILE) putc(')', (FILE))
76
77/* Print an index register (whose rtx is IREG).  */
78#define PRINT_IREG(FILE,IREG) \
79  do								\
80  { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); }	\
81  while (0)
82
83/* Print an index scale factor SCALE.  */
84#define PRINT_SCALE(FILE,SCALE) \
85  if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
86
87/* Print a base/index combination.
88   BREG is the base reg rtx, IREG is the index reg rtx,
89   and SCALE is the index scale factor (an integer).  */
90
91#define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
92  { ADDR_BEG (FILE); 				\
93    if (BREG) PRINT_REG ((BREG), 0, (FILE));	\
94    if ((IREG) != 0)				\
95      { PRINT_IREG ((FILE), (IREG));		\
96        PRINT_SCALE ((FILE), (SCALE)); }	\
97    ADDR_END (FILE); }
98
99/* Define the syntax of pseudo-ops, labels and comments.  */
100
101/* String containing the assembler's comment-starter.  */
102
103#define ASM_COMMENT_START "/"
104
105/* Output to assembler file text saying following lines
106   may contain character constants, extra white space, comments, etc.  */
107
108#define ASM_APP_ON "/APP\n"
109
110/* Output to assembler file text saying following lines
111   no longer contain unusual constructs.  */
112
113#define ASM_APP_OFF "/NO_APP\n"
114
115/* Output before read-only data.  */
116
117#define TEXT_SECTION_ASM_OP ".text"
118
119/* Output before writable (initialized) data.  */
120
121#define DATA_SECTION_ASM_OP ".data"
122
123/* Output before writable (uninitialized) data.  */
124
125#define BSS_SECTION_ASM_OP ".bss"
126
127/* This is how to output a command to make the user-level label named NAME
128   defined for reference from other files.  */
129
130#define ASM_GLOBALIZE_LABEL(FILE,NAME)	\
131  (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
132
133/* By default, target has a 80387, uses IEEE compatible arithmetic,
134   and returns float values in the 387.  */
135
136#define TARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
137
138/* Floating-point return values come in the FP register.  */
139
140#define VALUE_REGNO(MODE) \
141  (GET_MODE_CLASS (MODE) == MODE_FLOAT				\
142   && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
143
144/* 1 if N is a possible register number for a function value. */
145
146#define FUNCTION_VALUE_REGNO_P(N) \
147  ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
148
149/* Output code to add DELTA to the first argument, and then jump to FUNCTION.
150   Used for C++ multiple inheritance.  */
151#define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION)	      \
152do {									      \
153  tree parm;								      \
154									      \
155  if (i386_regparm > 0)							      \
156    parm = TYPE_ARG_TYPES (TREE_TYPE (function));			      \
157  else									      \
158    parm = NULL_TREE;							      \
159  for (; parm; parm = TREE_CHAIN (parm))				      \
160    if (TREE_VALUE (parm) == void_type_node)				      \
161      break;								      \
162  fprintf (FILE, "\taddl $%d,%s\n", DELTA,				      \
163	   parm ? "%eax"						      \
164	   : aggregate_value_p (TREE_TYPE (TREE_TYPE (FUNCTION))) ? "8(%esp)" \
165	   : "4(%esp)");						      \
166									      \
167  if (flag_pic)								      \
168    {									      \
169      rtx xops[2];							      \
170      xops[0] = pic_offset_table_rtx;					      \
171      xops[1] = (rtx) gen_label_rtx ();					      \
172									      \
173      if (i386_regparm > 2)						      \
174	abort ();							      \
175      output_asm_insn ("push%L0 %0", xops);				      \
176      output_asm_insn (AS1 (call,%P1), xops);				      \
177      ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", CODE_LABEL_NUMBER (xops[1]));     \
178      output_asm_insn (AS1 (pop%L0,%0), xops);				      \
179      output_asm_insn ("addl $%__GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops);     \
180      fprintf (FILE, "\tmovl ");					      \
181      assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));	      \
182      fprintf (FILE, "@GOT(%%ebx),%%ecx\n\tpopl %%ebx\n\tjmp *%%ecx\n");      \
183    }									      \
184  else									      \
185    {									      \
186      fprintf (FILE, "\tjmp ");						      \
187      assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0));	      \
188      fprintf (FILE, "\n");						      \
189    }									      \
190} while (0)
191