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| author | Iru Cai <mytbk920423@gmail.com> | 2021-06-29 21:16:26 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-07-07 14:54:56 +0000 |
| commit | 88eb16786872404c9279ac6b0decbd98dac7ca8d (patch) | |
| tree | 00254cb216ff13594d90e164a58ee4cf1001afdf /src/arch | |
| parent | d109354c0f1d4b155c60701cd42e632213350d72 (diff) | |
arch/x86: Save resume vector to stack in x86_64 mode
In x86_64, the first function parameter is passed in rdi register, and
the 32-bit code after exiting long mode reads the resume vector in
4(%esp), so it's needed to save the resume vector from rdi to 4(%rsp).
Also note that the function attribute "regparm" only works on x86-32
targets according to the GCC manual, so "asmlinkage" doesn't change
the ABI of an x86_64 function.
Tested on HP EliteBook 2560p. The laptop can resume from S3 in x86_64
mode after this change.
Change-Id: I45f2678071b2511c0af5dce9d9b73ac70dfd7252
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55947
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/wakeup.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/arch/x86/wakeup.S b/src/arch/x86/wakeup.S index dc9510bb90..7462dadbe8 100644 --- a/src/arch/x86/wakeup.S +++ b/src/arch/x86/wakeup.S @@ -15,6 +15,13 @@ .globl __wakeup __wakeup: #if ENV_X86_64 + /* When called in x86_64 mode, the resume vector is in %rdi + * instead of the stack, save it in 4(%rsp) for the 32-bit code. + * It's OK to overwrite the return address at (%rsp) because this + * function doesn't return. + */ + mov %edi, 4(%rsp) + xor %rax,%rax mov %ss, %ax push %rax |