| /* |
| * arch/parisc/vfork.S, "vfork() me harder. ugh." -- kyle |
| * |
| * %r20 contains the system call number, %rp contains whence we came, |
| * %rp is saved and restored across the syscall, thankfully. |
| * |
| */ |
| |
| .text |
| .align 64 ; cache-width aligned |
| .globl vfork |
| .type vfork,@function |
| vfork: |
| /* pid_t vfork(void) */ |
| ble 0x100(%sr2, %r0) ; jump to gateway page |
| nop |
| |
| ldi -0x1000,%r19 ; %r19 = -4096 |
| sub %r0,%ret0,%r22 ; %r22 = -%ret0 |
| cmpb,>>=,n %r19,%ret0,1f ; if %ret0 >= -4096UL |
| ldi -1,%ret0 ; nullified on taken forward |
| |
| /* store %r22 to errno... */ |
| ldil L%errno,%r1 |
| ldo R%errno(%r1),%r1 |
| stw %r22,0(%r1) |
| 1: |
| bv %r0(%rp) ; jump back |
| nop |
| |
| .size vfork,.-vfork |
