1/* Target definitions for GCC for Intel 80386 running System V.4
2   Copyright (C) 1991, 2001, 2002 Free Software Foundation, Inc.
3
4   Written by Ron Guilmette (rfg@netcom.com).
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13GCC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING.  If not, write to
20the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21Boston, MA 02110-1301, USA.  */
22
23
24#define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
25
26/* The svr4 ABI for the i386 says that records and unions are returned
27   in memory.  */
28
29#undef RETURN_IN_MEMORY
30#define RETURN_IN_MEMORY(TYPE) \
31  (TYPE_MODE (TYPE) == BLKmode \
32   || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
33
34/* Output at beginning of assembler file.  */
35/* The .file command should always begin the output.  */
36
37#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
38#undef X86_FILE_START_VERSION_DIRECTIVE
39#define X86_FILE_START_VERSION_DIRECTIVE true
40
41#undef DBX_REGISTER_NUMBER
42#define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
43
44/* The routine used to output sequences of byte values.  We use a special
45   version of this for most svr4 targets because doing so makes the
46   generated assembly code more compact (and thus faster to assemble)
47   as well as more readable.  Note that if we find subparts of the
48   character sequence which end with NUL (and which are shorter than
49   STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
50
51#undef ASM_OUTPUT_ASCII
52#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)				\
53  do									\
54    {									\
55      const unsigned char *_ascii_bytes =				\
56        (const unsigned char *) (STR);					\
57      const unsigned char *limit = _ascii_bytes + (LENGTH);		\
58      unsigned bytes_in_chunk = 0;					\
59      for (; _ascii_bytes < limit; _ascii_bytes++)			\
60        {								\
61	  const unsigned char *p;					\
62	  if (bytes_in_chunk >= 64)					\
63	    {								\
64	      fputc ('\n', (FILE));					\
65	      bytes_in_chunk = 0;					\
66	    }								\
67	  for (p = _ascii_bytes; p < limit && *p != '\0'; p++)		\
68	    continue;							\
69	  if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)	\
70	    {								\
71	      if (bytes_in_chunk > 0)					\
72		{							\
73		  fputc ('\n', (FILE));					\
74		  bytes_in_chunk = 0;					\
75		}							\
76	      ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);		\
77	      _ascii_bytes = p;						\
78	    }								\
79	  else								\
80	    {								\
81	      if (bytes_in_chunk == 0)					\
82		fprintf ((FILE), "\t.byte\t");				\
83	      else							\
84		fputc (',', (FILE));					\
85	      fprintf ((FILE), "0x%02x", *_ascii_bytes);		\
86	      bytes_in_chunk += 5;					\
87	    }								\
88	}								\
89      if (bytes_in_chunk > 0)						\
90        fprintf ((FILE), "\n");						\
91    }									\
92  while (0)
93
94/* A C statement (sans semicolon) to output to the stdio stream
95   FILE the assembler definition of uninitialized global DECL named
96   NAME whose size is SIZE bytes and alignment is ALIGN bytes.
97   Try to use asm_output_aligned_bss to implement this macro.  */
98
99#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
100  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
101
102/* Handle special EH pointer encodings.  Absolute, pc-relative, and
103   indirect are handled automatically.  */
104#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
105  do {									\
106    if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)		\
107      {									\
108        fputs (ASM_LONG, FILE);						\
109        assemble_name (FILE, XSTR (ADDR, 0));				\
110	fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
111        goto DONE;							\
112      }									\
113  } while (0)
114
115/* Used by crtstuff.c to initialize the base of data-relative relocations.
116   These are GOT relative on x86, so return the pic register.  */
117#ifdef __PIC__
118#define CRT_GET_RFIB_DATA(BASE)			\
119  {						\
120    register void *ebx_ __asm__("ebx");		\
121    BASE = ebx_;				\
122  }
123#else
124#define CRT_GET_RFIB_DATA(BASE)						\
125  __asm__ ("call\t.LPR%=\n"						\
126	   ".LPR%=:\n\t"						\
127	   "popl\t%0\n\t"						\
128	   /* Due to a GAS bug, this cannot use EAX.  That encodes	\
129	      smaller than the traditional EBX, which results in the	\
130	      offset being off by one.  */				\
131	   "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"			\
132	   : "=d"(BASE))
133#endif
134