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

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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 <[email protected]>
Cc: <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: Matt Fleming <[email protected]>
This commit is contained in:
David Woodhouse authored and H. Peter Anvin committed 2013-01-27 20:19:37 -08:00
1 parent 70a479cbe8
commit f791620fa7
1 file changed
+2
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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