1/* SPDX-License-Identifier: GPL-2.0 */ 2# 3# arch/x86_64/setjmp.S 4# 5# setjmp/longjmp for the x86-64 architecture 6# 7 8# 9# The jmp_buf is assumed to contain the following, in order: 10# %rbx 11# %rsp (post-return) 12# %rbp 13# %r12 14# %r13 15# %r14 16# %r15 17# <return address> 18# 19 20 .text 21 .align 4 22 .globl kernel_setjmp 23 .type kernel_setjmp, @function 24kernel_setjmp: 25 pop %rsi # Return address, and adjust the stack 26 xorl %eax,%eax # Return value 27 movq %rbx,(%rdi) 28 movq %rsp,8(%rdi) # Post-return %rsp! 29 push %rsi # Make the call/return stack happy 30 movq %rbp,16(%rdi) 31 movq %r12,24(%rdi) 32 movq %r13,32(%rdi) 33 movq %r14,40(%rdi) 34 movq %r15,48(%rdi) 35 movq %rsi,56(%rdi) # Return address 36 ret 37 38 .size kernel_setjmp,.-kernel_setjmp 39 40 .text 41 .align 4 42 .globl kernel_longjmp 43 .type kernel_longjmp, @function 44kernel_longjmp: 45 movl %esi,%eax # Return value (int) 46 movq (%rdi),%rbx 47 movq 8(%rdi),%rsp 48 movq 16(%rdi),%rbp 49 movq 24(%rdi),%r12 50 movq 32(%rdi),%r13 51 movq 40(%rdi),%r14 52 movq 48(%rdi),%r15 53 jmp *56(%rdi) 54 55 .size kernel_longjmp,.-kernel_longjmp 56