274 lines
9.2 KiB
C
274 lines
9.2 KiB
C
/* m68kelf support, derived from m68kv4.h */
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/* Target definitions for GNU compiler for mc680x0 running System V.4
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Copyright (C) 1991, 1993 Free Software Foundation, Inc.
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Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
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This file is part of GNU CC.
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GNU CC 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 2, or (at your option)
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any later version.
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GNU CC 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* #notinclude "m68k/sgs.h" /* The m68k/SVR4 assembler is SGS based */
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/* These are necessary for -fpic/-fPIC to work correctly. */
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#ifndef MOTOROLA
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#define MOTOROLA /* Use MOTOROLA syntax. */
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#endif
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#ifdef USE_GAS /* when present, forces jsbr instead of jsr. */
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#undef USE_GAS
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#endif
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#ifndef SWBEG_ASM_OP
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#define SWBEG_ASM_OP ".swbeg"
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#endif
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/* Here are four prefixes that are used by asm_fprintf to
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facilitate customization for alternate assembler syntaxes.
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Machines with no likelihood of an alternate syntax need not
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define these and need not use asm_fprintf. */
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/* The prefix for register names. Note that REGISTER_NAMES
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is supposed to include this prefix. Also note that this is NOT an
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fprintf format string, it is a literal string */
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#undef REGISTER_PREFIX
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#define REGISTER_PREFIX "%"
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/* The prefix for local (compiler generated) labels.
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These labels will not appear in the symbol table. */
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#undef LOCAL_LABEL_PREFIX
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#define LOCAL_LABEL_PREFIX "."
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/* The prefix to add to user-visible assembler symbols. */
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#undef USER_LABEL_PREFIX
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#define USER_LABEL_PREFIX ""
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/* The prefix for immediate operands. */
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#undef IMMEDIATE_PREFIX
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#define IMMEDIATE_PREFIX "#"
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/* In the machine description we can't use %R, because it will not be seen
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by ASM_FPRINTF. (Isn't that a design bug?). */
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#undef REGISTER_PREFIX_MD
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#define REGISTER_PREFIX_MD "%%"
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/* config/m68k.md has an explicit reference to the program counter,
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prefix this by the register prefix. */
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#define ASM_RETURN_CASE_JUMP \
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do { \
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if (TARGET_5200) \
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return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
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else \
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return "jmp %%pc@(2,%0:w)"; \
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} while (0)
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/* How to refer to registers in assembler output.
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This sequence is indexed by compiler's hard-register-number.
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Motorola format uses different register names than defined
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in m68k.h. */
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#undef REGISTER_NAMES
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#define REGISTER_NAMES \
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{"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
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"%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
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"%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
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/* This is how to output an assembler line that says to advance the
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location counter to a multiple of 2**LOG bytes. */
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#undef ASM_OUTPUT_ALIGN
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#define ASM_OUTPUT_ALIGN(FILE,LOG) \
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if ((LOG) > 0) \
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fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
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else if ((LOG) > 31) \
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abort ();
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/* Use proper assembler syntax for these macros. */
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#undef ASM_OUTPUT_REG_PUSH
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#define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
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asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
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#undef ASM_OUTPUT_REG_POP
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#define ASM_OUTPUT_REG_POP(FILE,REGNO) \
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asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
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/* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
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g++ assembler names. When this is defined, g++ uses embedded '.'
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characters and some m68k assemblers have problems with this. The
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chances are much greater that any particular assembler will permit
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embedded '$' characters. */
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#undef NO_DOLLAR_IN_LABEL
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/* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
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is to use the nonreentrant technique for returning structure and union
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values, as commonly implemented by the AT&T Portable C Compiler (PCC).
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When defined, the gcc option -fpcc-struct-return can be used to cause
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this form to be generated. When undefined, the option does nothing.
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For m68k SVR4, the convention is to use a reentrant technique compatible
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with the gcc default, so override the definition of this macro in m68k.h */
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#undef PCC_STATIC_STRUCT_RETURN
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/* Local common symbols are declared to the assembler with ".lcomm" rather
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than ".bss", so override the definition in svr4.h */
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#undef BSS_ASM_OP
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#define BSS_ASM_OP ".lcomm"
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/* Register in which address to store a structure value is passed to a
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function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
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#undef STRUCT_VALUE_REGNUM
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#define STRUCT_VALUE_REGNUM 8
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#define ASM_COMMENT_START "|"
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#undef TYPE_OPERAND_FMT
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#define TYPE_OPERAND_FMT "@%s"
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/* Define how the m68k registers should be numbered for Dwarf output.
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The numbering provided here should be compatible with the native
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SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
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are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
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#undef DBX_REGISTER_NUMBER
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#define DBX_REGISTER_NUMBER(REGNO) (REGNO)
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/* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
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It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
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to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the
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definition from m68k/sgs.h here. Note that ASM_NO_SKIP_IN_TEXT is
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defined in m68k/sgs.h, so we don't have to repeat it here. */
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#undef ASM_OUTPUT_SKIP
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#define ASM_OUTPUT_SKIP(FILE,SIZE) \
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fprintf (FILE, "\t%s %u\n", SPACE_ASM_OP, (SIZE))
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#if 0
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/* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
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1 byte alignment. Don't generate alignment for COMMON seems to be
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safer until we the assembler is fixed. */
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#undef ASM_OUTPUT_ALIGNED_COMMON
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/* Same problem with this one. */
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#undef ASM_OUTPUT_ALIGNED_LOCAL
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#endif
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/* The `string' directive on m68k svr4 does not handle string with
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escape char (ie., `\') right. Use normal way to output ASCII bytes
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seems to be safer. */
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#undef ASM_OUTPUT_ASCII
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#define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
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do { \
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register int sp = 0, lp = 0, ch; \
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fprintf ((FILE), "\t%s ", BYTE_ASM_OP); \
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do { \
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ch = (PTR)[sp]; \
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if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \
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{ \
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fprintf ((FILE), "'%c", ch); \
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} \
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else \
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{ \
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fprintf ((FILE), "0x%x", ch); \
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} \
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if (++sp < (LEN)) \
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{ \
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if ((sp % 10) == 0) \
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{ \
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fprintf ((FILE), "\n\t%s ", BYTE_ASM_OP); \
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} \
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else \
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{ \
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putc (',', (FILE)); \
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} \
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} \
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} while (sp < (LEN)); \
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putc ('\n', (FILE)); \
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} while (0)
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/* SVR4 m68k assembler is bitching on the syntax `2.b'.
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So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */
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#undef ASM_OUTPUT_CASE_END
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#define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
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do { \
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if (switch_table_difference_label_flag) \
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asm_fprintf ((FILE), "\t%s %LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM));\
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switch_table_difference_label_flag = 0; \
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} while (0)
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extern int switch_table_difference_label_flag;
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#undef ASM_OUTPUT_COMMON
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#undef ASM_OUTPUT_LOCAL
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#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
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( fputs (".comm ", (FILE)), \
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assemble_name ((FILE), (NAME)), \
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fprintf ((FILE), ",%u\n", (SIZE)))
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#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
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( fputs (".lcomm ", (FILE)), \
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assemble_name ((FILE), (NAME)), \
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fprintf ((FILE), ",%u\n", (SIZE)))
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/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
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keep switch tables in the text section. */
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#define JUMP_TABLES_IN_TEXT_SECTION 1
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/* Override the definition in svr4.h. In m68k svr4, using swbeg is the
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standard way to do switch table. */
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#undef ASM_OUTPUT_BEFORE_CASE_LABEL
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#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
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fprintf ((FILE), "\t%s &%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
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/* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an
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operand of a function call. */
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#undef LEGITIMATE_PIC_OPERAND_P
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#define LEGITIMATE_PIC_OPERAND_P(X) \
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(! symbolic_operand (X, VOIDmode) \
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|| ((GET_CODE(X) == SYMBOL_REF) && SYMBOL_REF_FLAG(X)))
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/* Turn off function cse if we are doing PIC. We always want function call
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to be done as `bsr foo@PLTPC', so it will force the assembler to create
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the PLT entry for `foo'. Doing function cse will cause the address of `foo'
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to be loaded into a register, which is exactly what we want to avoid when
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we are doing PIC on svr4 m68k. */
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#undef OVERRIDE_OPTIONS
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#define OVERRIDE_OPTIONS \
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{ \
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if (flag_pic) flag_no_function_cse = 1; \
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if (! TARGET_68020 && flag_pic == 2) \
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error("-fPIC is not currently supported on the 68000 or 68010\n"); \
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}
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/* end of stuff from m68kv4.h */
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#undef SGS_CMP_ORDER
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC "crtend.o%s"
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC "crtbegin.o%s"
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