[coreboot-gerrit] Change in coreboot[master]: libpayload: memset should support unaligned pointer

[Jérémy Compostella (Code Review)]

Jérémy Compostella has uploaded this change for review. ( https://review.coreboot.org/20524

Change subject: libpayload: memset should support unaligned pointer
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libpayload: memset should support unaligned pointer

The optimization of the memset() function introduced by commit
dbadb1dd634c8c9419215ade0666a7fb69a4447b is provoking an issue on x86
platform when compile without the CONFIG_GPL option.

GCC is making use of the movdqa instruction to copy words.  This
instruction can raise a "General Protection Fault Exception" when it
is called on a non-aligned address argument.

Change-Id: I73382a76a4399d8e78244867f2ebb1dca176a6bf
Signed-off-by: Jeremy Compostella 
---
M payloads/libpayload/libc/memory.c
1 file changed, 5 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/24/20524/1

diff --git a/payloads/libpayload/libc/memory.c b/payloads/libpayload/libc/memory.c
index ae476cf..cb56802 100644
--- a/payloads/libpayload/libc/memory.c
+++ b/payloads/libpayload/libc/memory.c
@@ -38,6 +38,11 @@
    size_t i;
    void *ret = s;
    unsigned long w = c & 0xff;
+	u8 *p = (u8 *)s;
+
+	s = (void *)ALIGN_UP((unsigned long)s, sizeof(unsigned long));
+	while (p < s && n--)
+		*p++ = c;

for (i = 1; i < sizeof(unsigned long); i <<= 1)
    	w = (w << (i * 8)) | w;