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panic: Fix unaligned memory access panic

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Some target's gcc will detect the address is unaligned and then
expand to byte load sequence, make the address to volatile can
prevent gcc optimize it.

BUG=none
BRANCH=none
TEST=make buildall;
     Verified that "crash unaligned" causes a panic on it83xx.

Change-Id: Ieb4f5f8fc65854aefe307fa675fe87d7581452ed
Signed-off-by: Kito Cheng <kito.cheng@gmail.com>
Reviewed-on: https://chromium-review.googlesource.com/374281
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Kito Cheng
2016-08-23 17:40:28 +08:00
committed by chrome-bot
parent 02b80c49f4
commit 6580e7f1a9
1 changed files with 2 additions and 1 deletions
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3
common/panic_output.c
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@@ -177,8 +177,9 @@ static int command_crash(int argc, char **argv)
stack_overflow_recurse(1);
#endif
} else if (!strcasecmp(argv[1], "unaligned")) {
volatile intptr_t unaligned_ptr = 0xcdef;
cflush();
ccprintf("%08x", *(volatile int *)0xcdef);
ccprintf("%08x", *(volatile int *)unaligned_ptr);
} else if (!strcasecmp(argv[1], "watchdog")) {
while (1)
;