diff options
Diffstat (limited to 'arch/x86/entry/entry_64.S')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index f446e9048d07..bd52f675d11d 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -756,45 +756,6 @@ SYM_CODE_START_LOCAL_NOALIGN(.Lbad_gs) SYM_CODE_END(.Lbad_gs) .previous -/* - * rdi: New stack pointer points to the top word of the stack - * rsi: Function pointer - * rdx: Function argument (can be NULL if none) - */ -SYM_FUNC_START(asm_call_on_stack) - /* - * Save the frame pointer unconditionally. This allows the ORC - * unwinder to handle the stack switch. - */ - pushq %rbp - mov %rsp, %rbp - - /* - * The unwinder relies on the word at the top of the new stack - * page linking back to the previous RSP. - */ - mov %rsp, (%rdi) - mov %rdi, %rsp - /* Move the argument to the right place */ - mov %rdx, %rdi - -1: - .pushsection .discard.instr_begin - .long 1b - . - .popsection - - CALL_NOSPEC rsi - -2: - .pushsection .discard.instr_end - .long 2b - . - .popsection - - /* Restore the previous stack pointer from RBP. */ - leaveq - ret -SYM_FUNC_END(asm_call_on_stack) - #ifdef CONFIG_XEN_PV /* * A note on the "critical region" in our callback handler. |