Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Push r4-r6 on the stack at the beginning of the function to avoid

Browse Source 
trashing r5 and r6 if copystr() is called with a length of 0.
This commit is contained in:
mark 1996-03-27 22:19:32 +00:00
parent c8d5b80dea
commit 57dd9b776a
1 changed files with 8 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
sys/arch/arm32/arm32/copystr.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: copystr.S,v 1.3 1996/02/02 18:05:49 mycroft Exp $ */ /* $NetBSD: copystr.S,v 1.4 1996/03/27 22:19:32 mark Exp $ */
/* /*
* Copyright (c) 1995 Mark Brinicombe. * Copyright (c) 1995 Mark Brinicombe.
@ -41,9 +41,6 @@
* optimised and fault protected copystr function * optimised and fault protected copystr function
* *
* Created : 16/05/95 * Created : 16/05/95
* Last updated : 16/05/95
*
* $Id: copystr.S,v 1.3 1996/02/02 18:05:49 mycroft Exp $
*/ */
#include "assym.h" #include "assym.h"
@ -53,7 +50,7 @@ sp .req r13
lr .req r14 lr .req r14
pc .req r15 pc .req r15
.text .text
Lcurpcb: Lcurpcb:
.word _curpcb .word _curpcb
@ -89,24 +86,22 @@ copystrtext:
.align 0 .align 0
/* /*
r0 - from * r0 - from
r1 - to * r1 - to
r2 - maxlens * r2 - maxlens
r3 - lencopied * r3 - lencopied
*/
*/
.global _copystrinout .global _copystrinout
_copystrinout: _copystrinout:
stmfd sp!, {r4-r6}
teq r2, #0x00000000 teq r2, #0x00000000
moveq r5, #0x00000000 moveq r5, #0x00000000
moveq r6, #0x00000000 moveq r6, #0x00000000
beq copystrexit beq copystrexit
stmfd sp!, {r4-r6}
ldr r4, Lcurpcb ldr r4, Lcurpcb
ldr r4, [r4] ldr r4, [r4]
teq r4, #0x00000000 teq r4, #0x00000000