| FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) |
| |
| .text |
| .code64 |
| |
| /* Must match jmp_buf structure layout */ |
| .struct 0 |
| env_retaddr: .quad 0 |
| env_stack: .quad 0 |
| env_rbx: .quad 0 |
| env_rbp: .quad 0 |
| env_r12: .quad 0 |
| env_r13: .quad 0 |
| env_r14: .quad 0 |
| env_r15: .quad 0 |
| .previous |
| |
| /* |
| * Save stack context for non-local goto |
| */ |
| .globl setjmp |
| setjmp: |
| /* Save return address */ |
| movq 0(%rsp), %rax |
| movq %rax, env_retaddr(%rdi) |
| /* Save stack pointer */ |
| movq %rsp, env_stack(%rdi) |
| /* Save other registers */ |
| movq %rbx, env_rbx(%rdi) |
| movq %rbp, env_rbp(%rdi) |
| movq %r12, env_r12(%rdi) |
| movq %r13, env_r13(%rdi) |
| movq %r14, env_r14(%rdi) |
| movq %r15, env_r15(%rdi) |
| /* Return 0 when returning as setjmp() */ |
| xorq %rax, %rax |
| ret |
| .size setjmp, . - setjmp |
| |
| /* |
| * Non-local jump to a saved stack context |
| */ |
| .globl longjmp |
| longjmp: |
| /* Get result in %rax */ |
| movq %rsi, %rax |
| /* Force result to non-zero */ |
| testq %rax, %rax |
| jnz 1f |
| incq %rax |
| 1: /* Restore stack pointer */ |
| movq env_stack(%rdi), %rsp |
| /* Restore other registers */ |
| movq env_rbx(%rdi), %rbx |
| movq env_rbp(%rdi), %rbp |
| movq env_r12(%rdi), %r12 |
| movq env_r13(%rdi), %r13 |
| movq env_r14(%rdi), %r14 |
| movq env_r15(%rdi), %r15 |
| /* Replace return address on the new stack */ |
| popq %rcx /* discard */ |
| pushq env_retaddr(%rdi) |
| /* Return to setjmp() caller */ |
| ret |
| .size longjmp, . - longjmp |
