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efi/x86: Respect 32-bit ABI in efi32_pe_entry()

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verify_cpu() clobbers BX and DI. In case we have to return error, we need
to preserve them to respect the 32-bit calling convention.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200301230436.2246909-3-nivedita@alum.mit.edu
Link: https://lore.kernel.org/r/20200308080859.21568-11-ardb@kernel.org
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Arvind Sankar 2020-03-08 09:08:41 +01:00 committed by Ingo Molnar
parent 3cdcd6899e
commit 71ff44ac6c
1 changed files with 4 additions and 0 deletions
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arch/x86/boot/compressed/head_64.S
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@ -660,7 +660,11 @@ SYM_DATA(efi_is64, .byte 1)
SYM_FUNC_START(efi32_pe_entry)
pushl %ebp
pushl %ebx
pushl %edi
call verify_cpu // check for long mode support
popl %edi
popl %ebx
testl %eax, %eax
movl $0x80000003, %eax // EFI_UNSUPPORTED
jnz 3f