arch/x86/um/setjmp_64.S

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