134 lines
4.7 KiB
C
134 lines
4.7 KiB
C
/* Target definitions for GCC for Intel 80386 running System V.4
|
|
Copyright (C) 1991, 2001, 2002 Free Software Foundation, Inc.
|
|
|
|
Written by Ron Guilmette (rfg@netcom.com).
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC 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.
|
|
|
|
GCC 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 GCC; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
|
|
#define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
|
|
|
|
/* The svr4 ABI for the i386 says that records and unions are returned
|
|
in memory. */
|
|
|
|
#undef RETURN_IN_MEMORY
|
|
#define RETURN_IN_MEMORY(TYPE) \
|
|
(TYPE_MODE (TYPE) == BLKmode \
|
|
|| (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
|
|
|
|
/* Output at beginning of assembler file. */
|
|
/* The .file command should always begin the output. */
|
|
|
|
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
|
|
#undef X86_FILE_START_VERSION_DIRECTIVE
|
|
#define X86_FILE_START_VERSION_DIRECTIVE true
|
|
|
|
#undef DBX_REGISTER_NUMBER
|
|
#define DBX_REGISTER_NUMBER(n) svr4_dbx_register_map[n]
|
|
|
|
/* The routine used to output sequences of byte values. We use a special
|
|
version of this for most svr4 targets because doing so makes the
|
|
generated assembly code more compact (and thus faster to assemble)
|
|
as well as more readable. Note that if we find subparts of the
|
|
character sequence which end with NUL (and which are shorter than
|
|
STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
|
|
|
|
#undef ASM_OUTPUT_ASCII
|
|
#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
|
|
do \
|
|
{ \
|
|
const unsigned char *_ascii_bytes = \
|
|
(const unsigned char *) (STR); \
|
|
const unsigned char *limit = _ascii_bytes + (LENGTH); \
|
|
unsigned bytes_in_chunk = 0; \
|
|
for (; _ascii_bytes < limit; _ascii_bytes++) \
|
|
{ \
|
|
const unsigned char *p; \
|
|
if (bytes_in_chunk >= 64) \
|
|
{ \
|
|
fputc ('\n', (FILE)); \
|
|
bytes_in_chunk = 0; \
|
|
} \
|
|
for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
|
|
continue; \
|
|
if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT) \
|
|
{ \
|
|
if (bytes_in_chunk > 0) \
|
|
{ \
|
|
fputc ('\n', (FILE)); \
|
|
bytes_in_chunk = 0; \
|
|
} \
|
|
ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
|
|
_ascii_bytes = p; \
|
|
} \
|
|
else \
|
|
{ \
|
|
if (bytes_in_chunk == 0) \
|
|
fprintf ((FILE), "\t.byte\t"); \
|
|
else \
|
|
fputc (',', (FILE)); \
|
|
fprintf ((FILE), "0x%02x", *_ascii_bytes); \
|
|
bytes_in_chunk += 5; \
|
|
} \
|
|
} \
|
|
if (bytes_in_chunk > 0) \
|
|
fprintf ((FILE), "\n"); \
|
|
} \
|
|
while (0)
|
|
|
|
/* A C statement (sans semicolon) to output to the stdio stream
|
|
FILE the assembler definition of uninitialized global DECL named
|
|
NAME whose size is SIZE bytes and alignment is ALIGN bytes.
|
|
Try to use asm_output_aligned_bss to implement this macro. */
|
|
|
|
#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
|
|
asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
|
|
|
|
/* Handle special EH pointer encodings. Absolute, pc-relative, and
|
|
indirect are handled automatically. */
|
|
#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
|
|
do { \
|
|
if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
|
|
{ \
|
|
fputs (ASM_LONG, FILE); \
|
|
assemble_name (FILE, XSTR (ADDR, 0)); \
|
|
fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
|
|
goto DONE; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Used by crtstuff.c to initialize the base of data-relative relocations.
|
|
These are GOT relative on x86, so return the pic register. */
|
|
#ifdef __PIC__
|
|
#define CRT_GET_RFIB_DATA(BASE) \
|
|
{ \
|
|
register void *ebx_ __asm__("ebx"); \
|
|
BASE = ebx_; \
|
|
}
|
|
#else
|
|
#define CRT_GET_RFIB_DATA(BASE) \
|
|
__asm__ ("call\t.LPR%=\n" \
|
|
".LPR%=:\n\t" \
|
|
"popl\t%0\n\t" \
|
|
/* Due to a GAS bug, this cannot use EAX. That encodes \
|
|
smaller than the traditional EBX, which results in the \
|
|
offset being off by one. */ \
|
|
"addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
|
|
: "=d"(BASE))
|
|
#endif
|