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jeremybenn |
/* Target definitions for GCC for Intel 80386 running System V.4
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Copyright (C) 1991, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
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Written by Ron Guilmette (rfg@netcom.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
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/* The svr4 ABI for the i386 says that records and unions are returned
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in memory. */
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#define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
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(TYPE_MODE (TYPE) == BLKmode \
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|| (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8));
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/* Output at beginning of assembler file. */
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/* The .file command should always begin the output. */
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#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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#undef X86_FILE_START_VERSION_DIRECTIVE
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#define X86_FILE_START_VERSION_DIRECTIVE true
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#undef DBX_REGISTER_NUMBER
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#define DBX_REGISTER_NUMBER(n) svr4_dbx_register_map[n]
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/* The routine used to output sequences of byte values. We use a special
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version of this for most svr4 targets because doing so makes the
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generated assembly code more compact (and thus faster to assemble)
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as well as more readable. Note that if we find subparts of the
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character sequence which end with NUL (and which are shorter than
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STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
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#undef ASM_OUTPUT_ASCII
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#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
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do \
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{ \
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const unsigned char *_ascii_bytes = \
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(const unsigned char *) (STR); \
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const unsigned char *limit = _ascii_bytes + (LENGTH); \
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unsigned bytes_in_chunk = 0; \
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for (; _ascii_bytes < limit; _ascii_bytes++) \
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{ \
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const unsigned char *p; \
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if (bytes_in_chunk >= 64) \
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{ \
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fputc ('\n', (FILE)); \
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bytes_in_chunk = 0; \
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} \
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for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
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continue; \
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if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT) \
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{ \
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if (bytes_in_chunk > 0) \
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{ \
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fputc ('\n', (FILE)); \
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bytes_in_chunk = 0; \
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} \
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ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
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_ascii_bytes = p; \
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} \
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else \
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{ \
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if (bytes_in_chunk == 0) \
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fputs (ASM_BYTE, (FILE)); \
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else \
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fputc (',', (FILE)); \
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fprintf ((FILE), "0x%02x", *_ascii_bytes); \
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bytes_in_chunk += 5; \
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} \
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} \
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if (bytes_in_chunk > 0) \
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fputc ('\n', (FILE)); \
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} \
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while (0)
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/* A C statement (sans semicolon) to output to the stdio stream
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FILE the assembler definition of uninitialized global DECL named
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NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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Try to use asm_output_aligned_bss to implement this macro. */
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#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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/* Handle special EH pointer encodings. Absolute, pc-relative, and
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indirect are handled automatically. */
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#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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do { \
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if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
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{ \
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fputs (ASM_LONG, (FILE)); \
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assemble_name (FILE, XSTR (ADDR, 0)); \
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fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), (FILE)); \
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goto DONE; \
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} \
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} while (0)
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/* Used by crtstuff.c to initialize the base of data-relative relocations.
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These are GOT relative on x86, so return the pic register. */
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#ifdef __PIC__
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#define CRT_GET_RFIB_DATA(BASE) \
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{ \
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register void *ebx_ __asm__("ebx"); \
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BASE = ebx_; \
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}
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#else
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#define CRT_GET_RFIB_DATA(BASE) \
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__asm__ ("call\t.LPR%=\n" \
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".LPR%=:\n\t" \
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"pop{l}\t%0\n\t" \
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/* Due to a GAS bug, this cannot use EAX. That encodes \
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smaller than the traditional EBX, which results in the \
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offset being off by one. */ \
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"add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
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"|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}" \
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: "=d"(BASE))
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#endif
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