x86/um/setjmp_64.S

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #
0003 # arch/x86_64/setjmp.S
0004 #
0005 # setjmp/longjmp for the x86-64 architecture
0006 #
0007
0008 #
0009 # The jmp_buf is assumed to contain the following, in order:
0010 #   %rbx
0011 #   %rsp (post-return)
0012 #   %rbp
0013 #   %r12
0014 #   %r13
0015 #   %r14
0016 #   %r15
0017 #   <return address>
0018 #
0019
0020     .text
0021     .align 4
0022     .globl kernel_setjmp
0023     .type kernel_setjmp, @function
0024 kernel_setjmp:
0025     pop  %rsi           # Return address, and adjust the stack
0026     xorl %eax,%eax          # Return value
0027     movq %rbx,(%rdi)
0028     movq %rsp,8(%rdi)       # Post-return %rsp!
0029     push %rsi           # Make the call/return stack happy
0030     movq %rbp,16(%rdi)
0031     movq %r12,24(%rdi)
0032     movq %r13,32(%rdi)
0033     movq %r14,40(%rdi)
0034     movq %r15,48(%rdi)
0035     movq %rsi,56(%rdi)      # Return address
0036     RET
0037
0038     .size kernel_setjmp,.-kernel_setjmp
0039
0040     .text
0041     .align 4
0042     .globl kernel_longjmp
0043     .type kernel_longjmp, @function
0044 kernel_longjmp:
0045     movl %esi,%eax          # Return value (int)
0046     movq (%rdi),%rbx
0047     movq 8(%rdi),%rsp
0048     movq 16(%rdi),%rbp
0049     movq 24(%rdi),%r12
0050     movq 32(%rdi),%r13
0051     movq 40(%rdi),%r14
0052     movq 48(%rdi),%r15
0053     jmp *56(%rdi)
0054
0055     .size kernel_longjmp,.-kernel_longjmp