diff options
Diffstat (limited to 'target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch')
| -rw-r--r-- | target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch b/target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch new file mode 100644 index 0000000..e3a0d7b --- /dev/null +++ b/target/linux/generic/patches-3.3/002-ARM-7668-1-fix-memset-related-crashes-caused-by-rece.patch @@ -0,0 +1,83 @@ +From 418df63adac56841ef6b0f1fcf435bc64d4ed177 Mon Sep 17 00:00:00 2001 +From: Nicolas Pitre <nicolas.pitre@linaro.org> +Date: Tue, 12 Mar 2013 13:00:42 +0100 +Subject: [PATCH] ARM: 7670/1: fix the memset fix + +Commit 455bd4c430b0 ("ARM: 7668/1: fix memset-related crashes caused by +recent GCC (4.7.2) optimizations") attempted to fix a compliance issue +with the memset return value. However the memset itself became broken +by that patch for misaligned pointers. + +This fixes the above by branching over the entry code from the +misaligned fixup code to avoid reloading the original pointer. + +Also, because the function entry alignment is wrong in the Thumb mode +compilation, that fixup code is moved to the end. + +While at it, the entry instructions are slightly reworked to help dual +issue pipelines. + +Signed-off-by: Nicolas Pitre <nico@linaro.org> +Tested-by: Alexander Holler <holler@ahsoftware.de> +Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> +--- + arch/arm/lib/memset.S | 33 +++++++++++++-------------------- + 1 file changed, 13 insertions(+), 20 deletions(-) + +diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S +index d912e7397ecc..94b0650ea98f 100644 +--- a/arch/arm/lib/memset.S ++++ b/arch/arm/lib/memset.S +@@ -14,31 +14,15 @@ + + .text + .align 5 +- .word 0 +- +-1: subs r2, r2, #4 @ 1 do we have enough +- blt 5f @ 1 bytes to align with? +- cmp r3, #2 @ 1 +- strltb r1, [ip], #1 @ 1 +- strleb r1, [ip], #1 @ 1 +- strb r1, [ip], #1 @ 1 +- add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3)) +-/* +- * The pointer is now aligned and the length is adjusted. Try doing the +- * memset again. +- */ + + ENTRY(memset) +-/* +- * Preserve the contents of r0 for the return value. +- */ +- mov ip, r0 +- ands r3, ip, #3 @ 1 unaligned? +- bne 1b @ 1 ++ ands r3, r0, #3 @ 1 unaligned? ++ mov ip, r0 @ preserve r0 as return value ++ bne 6f @ 1 + /* + * we know that the pointer in ip is aligned to a word boundary. + */ +- orr r1, r1, r1, lsl #8 ++1: orr r1, r1, r1, lsl #8 + orr r1, r1, r1, lsl #16 + mov r3, r1 + cmp r2, #16 +@@ -127,4 +111,13 @@ ENTRY(memset) + tst r2, #1 + strneb r1, [ip], #1 + mov pc, lr ++ ++6: subs r2, r2, #4 @ 1 do we have enough ++ blt 5b @ 1 bytes to align with? ++ cmp r3, #2 @ 1 ++ strltb r1, [ip], #1 @ 1 ++ strleb r1, [ip], #1 @ 1 ++ strb r1, [ip], #1 @ 1 ++ add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3)) ++ b 1b + ENDPROC(memset) +-- +1.8.3.2 + |