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a862685541
for syscalls, so one frame was lost in backtraces from syscalls. This is handled better in the kernel by using a different mcount entry point for profiling before the frame pointer is set up. Expand RCSID(). Use .p2align instead of the ambiguous .align. Added idempotency ifdef. Removed unused macros ALTENTRY(), ALTASENTRY(), ASENTRY(), _MID_ENTRY. Cleaned up formatting. Reviewed by: jdp reviewed an old version Obtained from: parts from NetBSD
165 lines
5.1 KiB
C
165 lines
5.1 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
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* $Id: asm.h,v 1.3 1997/04/15 14:06:34 bde Exp $
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*/
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#ifndef _MACHINE_ASM_H_
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#define _MACHINE_ASM_H_
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#include <sys/cdefs.h>
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#ifdef PIC
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#define PIC_PROLOGUE \
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pushl %ebx; \
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call 1f; \
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1: \
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popl %ebx; \
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
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#define PIC_EPILOGUE \
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popl %ebx
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#define PIC_PLT(x) x@PLT
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#define PIC_GOT(x) x@GOT(%ebx)
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#define PIC_GOTOFF(x) x@GOTOFF(%ebx)
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#else
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#define PIC_PROLOGUE
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#define PIC_EPILOGUE
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#define PIC_PLT(x) x
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#define PIC_GOT(x) x
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#define PIC_GOTOFF(x) x
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#endif
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/*
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* CNAME and HIDENAME manage the relationship between symbol names in C
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* and the equivalent assembly language names. CNAME is given a name as
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* it would be used in a C program. It expands to the equivalent assembly
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* language name. HIDENAME is given an assembly-language name, and expands
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* to a possibly-modified form that will be invisible to C programs.
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*/
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#ifdef __ELF__
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#define CNAME(csym) csym
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#define HIDENAME(asmsym) __CONCAT(.,asmsym)
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#else
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#define CNAME(csym) __CONCAT(_,csym)
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#define HIDENAME(asmsym) asmsym
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#endif
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/* XXX should use .p2align 4,0x90 for -m486. */
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#define _START_ENTRY .text; .p2align 2,0x90
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#define _ENTRY(x) _START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x):
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#ifdef PROF
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#define ENTRY(x) _ENTRY(x); \
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pushl %ebp; movl %esp,%ebp; \
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call PIC_PLT(HIDENAME(mcount)); \
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popl %ebp
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#else
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#define ENTRY(x) _ENTRY(x)
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#endif
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#define RCSID(x) .text; .asciz x
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#ifdef _ARCH_INDIRECT
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/*
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* Generate code to select between the generic functions and _ARCH_INDIRECT
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* specific ones.
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* XXX nested __CONCATs don't work with non-ANSI cpp's.
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*/
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#define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
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#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
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#define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
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#define GNAME(x) CNAME(__CONCAT(__generic_,x))
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/* Don't bother profiling this. */
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#ifdef PIC
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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PIC_PROLOGUE; \
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movl PIC_GOT(AVECNAME(x)),%eax; \
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PIC_EPILOGUE; \
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jmpl *(%eax)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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PIC_PROLOGUE; \
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call PIC_PLT(CNAME(__get_hw_float)); \
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testl %eax,%eax; \
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movl PIC_GOT(ANAME(x)),%eax; \
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jne 8f; \
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movl PIC_GOT(GNAME(x)),%eax; \
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8: \
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movl PIC_GOT(AVECNAME(x)),%edx; \
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movl %eax,(%edx); \
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PIC_EPILOGUE; \
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jmpl *%eax
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#else /* !PIC */
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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jmpl *AVECNAME(x)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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call CNAME(__get_hw_float); \
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testl %eax,%eax; \
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movl $ANAME(x),%eax; \
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jne 8f; \
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movl $GNAME(x),%eax; \
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8: \
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movl %eax,AVECNAME(x); \
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jmpl *%eax
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#endif /* PIC */
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#define ARCH_VECTOR(x) .data; .p2align 2; \
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.globl AVECNAME(x); \
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.type AVECNAME(x),@object; \
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.size AVECNAME(x),4; \
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AVECNAME(x): .long ASELNAME(x)
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#undef _ENTRY
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#define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
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_START_ENTRY; \
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.globl ANAME(x); .type ANAME(x),@function; ANAME(x):
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#endif /* _ARCH_INDIRECT */
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#endif /* !_MACHINE_ASM_H_ */
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