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authorJohn Crispin <john@openwrt.org>2016-03-10 19:10:54 +0000
committerJohn Crispin <john@openwrt.org>2016-03-10 19:10:54 +0000
commit01ca7a34f08856331f426c0e34d06d738e150b17 (patch)
treee937e1a4a60948a23a95e6b56eaceaddd6d31006 /target/linux/brcm63xx/image
parentb2348e69ad1d228d4ac32f5a19246439d9960d9b (diff)
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brcm63xx/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 code of the loader does not reserve stack space for these registers thus when the 'loader_main' function needs to save its arguments, those will be stored in the 'workspace' area instead of the stack. Because the workspace area is also used by other part of the code, the saved register values gets overwritten and this often leads to failed kernel boots. Fix the code to reserve stack space for the registers to avoid this error. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> [noltari: apply the fix for brcm63xx too] Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 48979
Diffstat (limited to 'target/linux/brcm63xx/image')
-rw-r--r--target/linux/brcm63xx/image/lzma-loader/src/head.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/image/lzma-loader/src/head.S b/target/linux/brcm63xx/image/lzma-loader/src/head.S
index 543996a0da..47a7c9bd63 100644
--- a/target/linux/brcm63xx/image/lzma-loader/src/head.S
+++ b/target/linux/brcm63xx/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