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.
92 lines
2.8 KiB
ArmAsm
92 lines
2.8 KiB
ArmAsm
/*-
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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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* $Id: brk.S,v 1.2 1995/01/23 01:29:39 davidg Exp $
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*/
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#if defined(SYSLIBC_RCS) && !defined(lint)
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.text
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.asciz "$Id: brk.S,v 1.2 1995/01/23 01:29:39 davidg Exp $"
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#endif /* SYSLIBC_RCS and not lint */
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#include "SYS.h"
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.globl HIDENAME(curbrk)
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.globl HIDENAME(minbrk)
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ENTRY(_brk)
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jmp ok
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ENTRY(brk)
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#ifdef PIC
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movl 4(%esp),%eax
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PIC_PROLOGUE
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movl PIC_GOT(HIDENAME(curbrk)),%edx # set up GOT addressing
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movl PIC_GOT(HIDENAME(minbrk)),%ecx #
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cmpl %eax,(%ecx)
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PIC_EPILOGUE
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jl ok
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movl (%ecx),%eax
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movl %eax,4(%esp)
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ok:
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lea SYS_break,%eax
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KERNCALL
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jb err
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movl 4(%esp),%eax
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movl %eax,(%edx)
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movl $0,%eax
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ret
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err:
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PIC_PROLOGUE
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jmp PIC_PLT(HIDENAME(cerror))
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#else
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movl 4(%esp),%eax
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cmpl %eax,HIDENAME(minbrk)
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jl ok
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movl HIDENAME(minbrk),%eax
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movl %eax,4(%esp)
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ok:
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lea SYS_break,%eax
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KERNCALL
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jb err
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movl 4(%esp),%eax
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movl %eax,HIDENAME(curbrk)
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movl $0,%eax
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ret
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err:
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jmp HIDENAME(cerror)
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#endif
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