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authorGabor Juhos <juhosg@openwrt.org>2016-03-21 13:15:29 +0000
committerGabor Juhos <juhosg@openwrt.org>2016-03-21 13:15:29 +0000
commitfc5c19f45b3cf162f1417385edb8c9d9b337387d (patch)
tree5f96d2bcd9aca48a06c2daeecc947c2abbf999dc /target/linux/ramips
parent4d0681d8658547d546e0b4f31d8ead47fecc33b3 (diff)
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ramips: lzma-loader: fix O32 ABI conformance
According to the calling convention of the o32 ABI the caller function must reserve stack space for $a0-$a3 registers in case the callee needs to save its arguments. The assembly startup code does not reserve stack space for these registers thus when the main C function needs to save its arguments, that will cause a stack overflow. Fix the assembly code to reserve stack space for the registers to avoid that. Untested. It seems that the lzma-loader is not used at all? Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 49062
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/image/lzma-loader/src/head.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/target/linux/ramips/image/lzma-loader/src/head.S b/target/linux/ramips/image/lzma-loader/src/head.S
index 543996a..47a7c9b 100644
--- a/target/linux/ramips/image/lzma-loader/src/head.S
+++ b/target/linux/ramips/image/lzma-loader/src/head.S
@@ -109,6 +109,9 @@ __bss_check:
/* Setup new "C" stack */
la sp, _stack
+ /* reserve stack space for a0-a3 registers */
+ subu sp, 16
+
/* jump to the decompressor routine */
la t0, loader_main
jr t0