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ramips: lzma-loader: fix O32 ABI conformance

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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
This commit is contained in:
Gabor Juhos 2016-03-21 13:15:29 +00:00
parent 4d0681d865
commit fc5c19f45b
1 changed files with 3 additions and 0 deletions
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3
target/linux/ramips/image/lzma-loader/src/head.S
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@ -109,6 +109,9 @@ __bss_check:
/* Setup new "C" stack */ /* Setup new "C" stack */
la sp, _stack la sp, _stack
/* reserve stack space for a0-a3 registers */
subu sp, 16
/* jump to the decompressor routine */ /* jump to the decompressor routine */
la t0, loader_main la t0, loader_main
jr t0 jr t0