Attachment 5341 Details for Bug 12518 – Patch to check for overlaps

[patch] Patch to check for overlaps

glibc-memcpy-ssse3.patch (text/plain), 1.20 KB, created by Felipe Contreras on 2011-03-30 07:21:26 UTC

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Creator: Felipe Contreras

Created: 2011-03-30 07:21:26 UTC

Size: 1.20 KB

patch

obsolete

>--- glibc-2.13/sysdeps/x86_64/multiarch/memcpy-ssse3.S	2011-01-18 06:34:07.000000000 +0200
>+++ glibc-2.13/sysdeps/x86_64/multiarch/memcpy-ssse3.S	2011-03-29 20:06:11.449090136 +0300
>@@ -84,6 +84,17 @@ L(copy_forward):
> 	ALIGN (4)
> L(80bytesormore):
> #ifndef USE_AS_MEMMOVE
>+	lea	(%rsi,%rdx),%r9
>+	lea	(%rdi,%rdx),%r11
>+	cmp	%rdi,%r9		/* dest start >= source end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	cmp	%rsi,%r11		/* source start >= destination end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	movb	$0, 0
>+	L(nonoverlap):
>+#endif
>+
>+#ifndef USE_AS_MEMMOVE
> 	cmp	%dil, %sil
> 	jle	L(copy_backward)
> #endif
>--- glibc-2.13/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S	2011-01-18 06:34:07.000000000 +0200
>+++ glibc-2.13/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S	2011-03-29 20:06:21.252112024 +0300
>@@ -90,6 +90,16 @@ L(bk_write):
> 
> 	ALIGN (4)
> L(144bytesormore):
>+#ifndef USE_AS_MEMMOVE
>+	lea	(%rsi,%rdx),%r9
>+	lea	(%rdi,%rdx),%r11
>+	cmp	%rdi,%r9		/* dest start >= source end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	cmp	%rsi,%r11		/* source start >= destination end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	movb	$0, 0
>+	L(nonoverlap):
>+#endif
> 
> #ifndef USE_AS_MEMMOVE
> 	cmp	%dil, %sil

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Attachments on bug 12518: 5264 | 5323 | 5341 | 5660