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x86, efi: Fix 32-bit EFI handover protocol entry point 

If the bootloader calls the EFI handover entry point as a standard function
call, then it'll have a return address on the stack. We need to pop that
before calling efi_main(), or the arguments will all be out of position on
the stack.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/1358513837.2397.247.camel@shinybook.infradead.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
David Woodhouse 2013-01-07 22:01:50 +00:00 committed by H. Peter Anvin
parent 70a479cbe8
commit f791620fa7
1 changed files with 2 additions and 0 deletions
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arch/x86/boot/compressed/head_32.S
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@ -50,8 +50,10 @@ ENTRY(startup_32)
pushl %eax
pushl %esi
pushl %ecx
sub $0x4, %esp
.org 0x30,0x90
add $0x4, %esp
call efi_main
cmpl $0, %eax
movl %eax, %esi