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smm: Switch from %edx to %ebx 

%edx gets clobbered before the c handler is invoked. This is just a
cleanup cl to make the next cl look clean.

BUG=b:80539294
TEST=verified SMI still works on grunt.

Change-Id: I21bf41ed4fdeaaa8737c883f202a39cb57c2b517
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/27228
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Raul E Rangel 2018-06-25 14:22:27 -06:00 committed by Martin Roth
parent 871156898c
commit e18e5ab5fa
1 changed files with 3 additions and 3 deletions
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6
src/cpu/x86/smm/smm_stub.S
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@ -132,9 +132,9 @@ smm_trampoline32:
1:
movl stack_size, %eax
mul %ecx /* %eax(stack_size) * %ecx(cpu) = %eax(offset) */
movl stack_top, %edx
subl %eax, %edx /* global_stack_top - offset = stack_top */
mov %edx, %esp
movl stack_top, %ebx
subl %eax, %ebx /* global_stack_top - offset = stack_top */
mov %ebx, %esp
/* Create stack frame by pushing a NULL stack base pointer */
pushl $0x0