[unix-history] / gnu / usr.bin / cc / common / i386 / unix.h

/* Definitions for Unix assembler syntax for the Intel 80386.
   Copyright (C) 1988 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.  */

/* This file defines the aspects of assembler syntax
   that are the same for all the i386 Unix systems
   (though they may differ in non-Unix systems).  */

/* Define some concatenation macros to concatenate an opcode
   and one, two or three operands.  In other assembler syntaxes
   they may alter the order of ther operands.  */

/* Note that the other files fail to use these
   in some of the places where they should.  */

#ifdef __STDC__
#define AS2(a,b,c) #a " " #b "," #c
#define AS3(a,b,c,d) #a " " #b "," #c "," #d
#define AS1(a,b) #a " " #b
#else
#define AS1(a,b) "a b"
#define AS2(a,b,c) "a b,c"
#define AS3(a,b,c,d) "a b,c,d"
#endif  

/* 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.  This macro controls what to do: by default, don't
   print %cl.  */
#define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)

/* Output the size-letter for an opcode.
   CODE is the letter used in an operand spec (L, B, W, S or Q).
   CH is the corresponding lower case letter
     (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS).  */
#define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))

/* Opcode suffix for fullword insn.  */
#define L_SIZE "l"

/* Prefix for register names in this syntax.  */
#define RP "%"

/* Prefix for immediate operands in this syntax.  */
#define IP "$"

/* Indirect call instructions should use `*'.  */
#define USE_STAR 1

/* Prefix for a memory-operand X.  */
#define PRINT_PTR(X, FILE)

/* Delimiters that surround base reg and index reg.  */
#define ADDR_BEG(FILE) putc('(', (FILE))
#define ADDR_END(FILE) putc(')', (FILE))

/* Print an index register (whose rtx is IREG).  */
#define PRINT_IREG(FILE,IREG) \
  do								\
  { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); }	\
  while (0)
  
/* Print an index scale factor SCALE.  */
#define PRINT_SCALE(FILE,SCALE) \
  if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))

/* Print a base/index combination.
   BREG is the base reg rtx, IREG is the index reg rtx,
   and SCALE is the index scale factor (an integer).  */

#define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
  { ADDR_BEG (FILE); 				\
    if (BREG) PRINT_REG ((BREG), 0, (FILE));	\
    if ((IREG) != 0)				\
      { PRINT_IREG ((FILE), (IREG));		\
        PRINT_SCALE ((FILE), (SCALE)); }	\
    ADDR_END (FILE); }
\f
/* Define the syntax of pseudo-ops, labels and comments.  */

/* String containing the assembler's comment-starter.  */

#define ASM_COMMENT_START "/"
#define COMMENT_BEGIN "/"

/* Output to assembler file text saying following lines
   may contain character constants, extra white space, comments, etc.  */

#define ASM_APP_ON "/APP\n"

/* Output to assembler file text saying following lines
   no longer contain unusual constructs.  */

#define ASM_APP_OFF "/NO_APP\n"

/* Output before read-only data.  */

#define TEXT_SECTION_ASM_OP ".text"

/* Output before writable (initialized) data.  */

#define DATA_SECTION_ASM_OP ".data"

/* Output before writable (uninitialized) data.  */

#define BSS_SECTION_ASM_OP ".bss"

/* This is how to output a command to make the user-level label named NAME
   defined for reference from other files.  */

#define ASM_GLOBALIZE_LABEL(FILE,NAME)	\
  (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))

/* By default, target has a 80387, uses IEEE compatible arithmetic,
   and returns float values in the 387, ie,
   (TARGET_80387 | TARGET_IEEE_FP | TARGET_FLOAT_RETURNS_IN_80387) */

#define TARGET_DEFAULT 0301

/* Floating-point return values come in the FP register.  */

#define VALUE_REGNO(MODE) \
  (GET_MODE_CLASS (MODE) == MODE_FLOAT				\
   && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)

/* 1 if N is a possible register number for a function value. */

#define FUNCTION_VALUE_REGNO_P(N) \
  ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
Commit	Line	Data
9bf86ebb PR	1	/* Definitions for Unix assembler syntax for the Intel 80386.
	2	Copyright (C) 1988 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	/* This file defines the aspects of assembler syntax
	21	that are the same for all the i386 Unix systems
	22	(though they may differ in non-Unix systems). */
	23
	24	/* Define some concatenation macros to concatenate an opcode
	25	and one, two or three operands. In other assembler syntaxes
	26	they may alter the order of ther operands. */
	27
	28	/* Note that the other files fail to use these
	29	in some of the places where they should. */
	30
	31	#ifdef __STDC__
	32	#define AS2(a,b,c) #a " " #b "," #c
	33	#define AS3(a,b,c,d) #a " " #b "," #c "," #d
	34	#define AS1(a,b) #a " " #b
	35	#else
	36	#define AS1(a,b) "a b"
	37	#define AS2(a,b,c) "a b,c"
	38	#define AS3(a,b,c,d) "a b,c,d"
	39	#endif
	40
	41	/* Define macro used to output shift-double opcodes when the shift
	42	count is in %cl. Some assemblers require %cl as an argument;
	43	some don't. This macro controls what to do: by default, don't
	44	print %cl. */
	45	#define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)
	46
	47	/* Output the size-letter for an opcode.
	48	CODE is the letter used in an operand spec (L, B, W, S or Q).
	49	CH is the corresponding lower case letter
	50	(except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS). */
	51	#define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
	52
	53	/* Opcode suffix for fullword insn. */
	54	#define L_SIZE "l"
	55
	56	/* Prefix for register names in this syntax. */
	57	#define RP "%"
	58
	59	/* Prefix for immediate operands in this syntax. */
	60	#define IP "$"
	61
	62	/* Indirect call instructions should use `'. /
	63	#define USE_STAR 1
	64
65	/* Prefix for a memory-operand X. */
66	#define PRINT_PTR(X, FILE)
67
68	/* Delimiters that surround base reg and index reg. */
69	#define ADDR_BEG(FILE) putc('(', (FILE))
70	#define ADDR_END(FILE) putc(')', (FILE))
71
72	/* Print an index register (whose rtx is IREG). */
73	#define PRINT_IREG(FILE,IREG) \
74	do \
75	{ fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); } \
76	while (0)
77
78	/* Print an index scale factor SCALE. */
79	#define PRINT_SCALE(FILE,SCALE) \
80	if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
81
82	/* Print a base/index combination.
83	BREG is the base reg rtx, IREG is the index reg rtx,
84	and SCALE is the index scale factor (an integer). */
85
86	#define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
87	{ ADDR_BEG (FILE); \
88	if (BREG) PRINT_REG ((BREG), 0, (FILE)); \
89	if ((IREG) != 0) \
90	{ PRINT_IREG ((FILE), (IREG)); \
91	PRINT_SCALE ((FILE), (SCALE)); } \
92	ADDR_END (FILE); }
93	\f
94	/* Define the syntax of pseudo-ops, labels and comments. */
95
96	/* String containing the assembler's comment-starter. */
97
98	#define ASM_COMMENT_START "/"
99	#define COMMENT_BEGIN "/"
100
101	/* Output to assembler file text saying following lines
102	may contain character constants, extra white space, comments, etc. */
103
104	#define ASM_APP_ON "/APP\n"
105
106	/* Output to assembler file text saying following lines
107	no longer contain unusual constructs. */
108
109	#define ASM_APP_OFF "/NO_APP\n"
110
111	/* Output before read-only data. */
112
113	#define TEXT_SECTION_ASM_OP ".text"
114
115	/* Output before writable (initialized) data. */
116
117	#define DATA_SECTION_ASM_OP ".data"
118
119	/* Output before writable (uninitialized) data. */
120
121	#define BSS_SECTION_ASM_OP ".bss"
122
123	/* This is how to output a command to make the user-level label named NAME
124	defined for reference from other files. */
125
126	#define ASM_GLOBALIZE_LABEL(FILE,NAME) \
127	(fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
128
129	/* By default, target has a 80387, uses IEEE compatible arithmetic,
130	and returns float values in the 387, ie,
131	(TARGET_80387 \| TARGET_IEEE_FP \| TARGET_FLOAT_RETURNS_IN_80387) */
132
133	#define TARGET_DEFAULT 0301
134
135	/* Floating-point return values come in the FP register. */
136
137	#define VALUE_REGNO(MODE) \
138	(GET_MODE_CLASS (MODE) == MODE_FLOAT \
139	&& TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
140
141	/* 1 if N is a possible register number for a function value. */
142
143	#define FUNCTION_VALUE_REGNO_P(N) \
144	((N) == 0 \|\| ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
145