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f1703dfbaa
In a nutshell, this macroizes the local/global symbol scoping rules that are different in a.out and ELF. It also makes the i386 assembler stubs conform to i386 PIC calling conventions - the a.out ld.so didn't object, but the ELF one needs it as it implements PIC jumps via PLT's as well as calls. The a.out rtld only worked because it was accidently snooping the grandparent calling function's return address off the stack.. This also affects the libc_r code a little, because of cpp macro nesting.
102 lines
3.6 KiB
C
102 lines
3.6 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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*
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* $Id: DEFS.h,v 1.2 1994/08/05 01:17:56 wollman Exp $
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*/
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#include <sys/cdefs.h>
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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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#if defined(__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 align 4,0x90 for -m486. */
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#define _START_ENTRY .align 2,0x90;
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#if 0
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/* Data is not used, except perhaps by non-g prof, which we don't support. */
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#define _MID_ENTRY .data; .align 2; 8:; .long 0; \
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.text; lea 8b,%eax;
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#else
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#define _MID_ENTRY
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#endif
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#ifdef PROF
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#define ALTENTRY(x) _START_ENTRY \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \
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_MID_ENTRY \
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call HIDENAME(mcount); jmp 9f
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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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_MID_ENTRY \
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call HIDENAME(mcount); 9:
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#define ALTASENTRY(x) _START_ENTRY \
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.globl x; .type x,@function; x:; \
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_MID_ENTRY \
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call HIDENAME(mcount); jmp 9f
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#define ASENTRY(x) _START_ENTRY \
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.globl x; .type x,@function; x:; \
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_MID_ENTRY \
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call HIDENAME(mcount); 9:
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#else /* !PROF */
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#define ENTRY(x) _START_ENTRY .globl CNAME(x); .type CNAME(x),@function; \
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CNAME(x):
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#define ALTENTRY(x) ENTRY(x)
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#define ASENTRY(x) _START_ENTRY .globl x; .type x,@function; x:
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#define ALTASENTRY(x) ASENTRY(x)
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#endif
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