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/* SPDX-License-Identifier: GPL-2.0 */
#
# arch/x86_64/setjmp.S
#
# setjmp/longjmp for the x86-64 architecture
#
#
# The jmp_buf is assumed to contain the following, in order:
# %rbx
# %rsp (post-return)
# %rbp
# %r12
# %r13
# %r14
# %r15
# <return address>
#
.text
.align 4
.globl kernel_setjmp
.type kernel_setjmp, @function
kernel_setjmp:
pop %rsi # Return address, and adjust the stack
xorl %eax,%eax # Return value
movq %rbx,(%rdi)
movq %rsp,8(%rdi) # Post-return %rsp!
push %rsi # Make the call/return stack happy
movq %rbp,16(%rdi)
movq %r12,24(%rdi)
movq %r13,32(%rdi)
movq %r14,40(%rdi)
movq %r15,48(%rdi)
movq %rsi,56(%rdi) # Return address
ret
.size kernel_setjmp,.-kernel_setjmp
.text
.align 4
.globl kernel_longjmp
.type kernel_longjmp, @function
kernel_longjmp:
movl %esi,%eax # Return value (int)
movq (%rdi),%rbx
movq 8(%rdi),%rsp
movq 16(%rdi),%rbp
movq 24(%rdi),%r12
movq 32(%rdi),%r13
movq 40(%rdi),%r14
movq 48(%rdi),%r15
jmp *56(%rdi)
.size kernel_longjmp,.-kernel_longjmp
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