From 6b9676b8c4886947be4f5724674c3af17dc6eeb9 Mon Sep 17 00:00:00 2001 From: juhosg Date: Mon, 21 Mar 2016 13:15:25 +0000 Subject: [PATCH] lantiq: 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. Compile tested only. Signed-off-by: Gabor Juhos git-svn-id: svn://svn.openwrt.org/openwrt/trunk@49061 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- target/linux/lantiq/image/lzma-loader/src/head.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/linux/lantiq/image/lzma-loader/src/head.S b/target/linux/lantiq/image/lzma-loader/src/head.S index 543996a0da..47a7c9bd63 100644 --- a/target/linux/lantiq/image/lzma-loader/src/head.S +++ b/target/linux/lantiq/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 -- 2.11.0