5ac7ffcc38
For some reason, libc exports the symbol .cerror (HIDENAME(cerror)), albeit in the FBSDprivate_1.0 version. It looks like there is no reason for this since it is not used from other libraries. Given that it cannot be accessed from C and its strange calling convention, it is rather unlikely that other things rely on it. Perhaps it is from a time when symbols could not be hidden. Most of the amd64 assembler code jumps to .cerror using the GOT. It can jump to it directly now, as in non-PIC mode. There are also some minor size optimizations to instructions but they yield virtually no benefit in the size of libc.so.7 due to padding. Reviewed by: kib
86 lines
2.5 KiB
ArmAsm
86 lines
2.5 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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* 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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#if defined(SYSLIBC_SCCS) && !defined(lint)
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.asciz "@(#)sbrk.s 5.1 (Berkeley) 4/23/90"
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#endif /* SYSLIBC_SCCS and not lint */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#include "SYS.h"
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.globl CNAME(_end)
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.globl HIDENAME(minbrk)
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.globl HIDENAME(curbrk)
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.data
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HIDENAME(minbrk): .quad CNAME(_end)
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HIDENAME(curbrk): .quad CNAME(_end)
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.text
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ENTRY(sbrk)
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pushq %rdi
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movq %rdi,%rcx
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#ifdef PIC
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movq PIC_GOT(HIDENAME(curbrk)),%rdx
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movq (%rdx),%rax
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#else
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movq HIDENAME(curbrk)(%rip),%rax
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#endif
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testq %rcx,%rcx
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jz back
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addq %rax,%rdi
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mov $SYS_break,%eax
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KERNCALL
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jb err
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#ifdef PIC
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movq PIC_GOT(HIDENAME(curbrk)),%rdx
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movq (%rdx),%rax
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#else
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movq HIDENAME(curbrk)(%rip),%rax
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#endif
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movq 0(%rsp), %rcx
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#ifdef PIC
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addq %rcx,(%rdx)
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#else
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addq %rcx,HIDENAME(curbrk)(%rip)
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#endif
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back:
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addq $8, %rsp
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ret
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err:
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addq $8, %rsp
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jmp HIDENAME(cerror)
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END(sbrk)
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.section .note.GNU-stack,"",%progbits
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