efi/libstub/x86: Avoid globals to store context during mixed mode calls

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Instead of storing the return address in a global variable when calling
a 32-bit EFI service from the 64-bit stub, avoid the indirection via
efi_exit32, and take the return address from the stack.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Borislav Petkov <bp@alien8.de>
Cc: James Morse <james.morse@arm.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191224151025.32482-26-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Ard Biesheuvel 2019-12-24 16:10:25 +01:00 • committed by Ingo Molnar

parent 7d4e323d02

commit 0679715e71

1 changed files with 3 additions and 14 deletions

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arch/x86/boot/compressed/efi_thunk_64.S

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