diff options
Diffstat (limited to 'src/kernel/arch/amd64/sysenter.s')
| -rw-r--r-- | src/kernel/arch/amd64/sysenter.s | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/kernel/arch/amd64/sysenter.s b/src/kernel/arch/amd64/sysenter.s index 8fa8acc..6b6d684 100644 --- a/src/kernel/arch/amd64/sysenter.s +++ b/src/kernel/arch/amd64/sysenter.s @@ -51,6 +51,12 @@ _sysexit_real: mov %ax, %gs */ + /* The state image referenced with an FXRSTOR instruction must have + * been saved using an FXSAVE instruction or be in the same format + * as required [...] will result in an incorrect state restoration. */ + // TODO will probably end up fucking something up in a hard to debug way + // sorry, future me. hopefully you have learned something from this + fxrstor (_sysexit_regs + 128) mov $_sysexit_regs, %rsp pop %r15 pop %r14 @@ -86,6 +92,7 @@ sysenter_stage1: mov $pml4_identity, %rsp mov %rsp, %cr3 + fxsave (_sysexit_regs + 128) mov $(_sysexit_regs + 128), %rsp push %rax push %rcx |