| FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) |
| |
| .section ".note.GNU-stack", "", @progbits |
| .text |
| .code32 |
| .arch i386 |
| |
| /* Must match jmp_buf structure layout */ |
| .struct 0 |
| env_retaddr: .long 0 |
| env_stack: .long 0 |
| env_ebx: .long 0 |
| env_esi: .long 0 |
| env_edi: .long 0 |
| env_ebp: .long 0 |
| .previous |
| |
| /* |
| * Save stack context for non-local goto |
| */ |
| .globl setjmp |
| setjmp: |
| /* Get jmp_buf pointer in %edx */ |
| movl 4(%esp),%edx |
| /* Save return address */ |
| movl 0(%esp),%eax |
| movl %eax, env_retaddr(%edx) |
| /* Save stack pointer */ |
| movl %esp, env_stack(%edx) |
| /* Save other registers */ |
| movl %ebx, env_ebx(%edx) |
| movl %esi, env_esi(%edx) |
| movl %edi, env_edi(%edx) |
| movl %ebp, env_ebp(%edx) |
| /* Return 0 when returning as setjmp() */ |
| xorl %eax, %eax |
| ret |
| .size setjmp, . - setjmp |
| |
| /* |
| * Non-local jump to a saved stack context |
| */ |
| .globl longjmp |
| longjmp: |
| /* Get jmp_buf pointer in %edx */ |
| movl 4(%esp),%edx |
| /* Get result in %eax */ |
| movl 8(%esp),%eax |
| /* Force result to non-zero */ |
| testl %eax, %eax |
| jnz 1f |
| incl %eax |
| 1: /* Restore stack pointer */ |
| movl env_stack(%edx), %esp |
| /* Restore other registers */ |
| movl env_ebx(%edx), %ebx |
| movl env_esi(%edx), %esi |
| movl env_edi(%edx), %edi |
| movl env_ebp(%edx), %ebp |
| /* Replace return address on the new stack */ |
| popl %ecx /* discard */ |
| pushl env_retaddr(%edx) |
| /* Return to setjmp() caller */ |
| ret |
| .size longjmp, . - longjmp |
