diff options
| -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 |