| /* |
| * arch/parisc/syscall.S |
| * |
| * %r20 contains the system call number, %r2 contains whence we came |
| * |
| */ |
| |
| .text |
| .align 64 ; cache-width aligned |
| .globl __syscall_common |
| .type __syscall_common,@function |
| __syscall_common: |
| ldo 0x40(%sp),%sp |
| stw %rp,-0x54(%sp) ; save return pointer |
| |
| ldw -0x74(%sp),%r22 ; %arg4 |
| ldw -0x78(%sp),%r21 ; %arg5 |
| |
| ble 0x100(%sr2, %r0) ; jump to gateway page |
| nop ; can we move a load here? |
| |
| 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: |
| ldw -0x54(%sp),%rp ; restore return pointer |
| bv %r0(%rp) ; jump back |
| ldo -0x40(%sp),%sp |
| |
| .size __syscall_common,.-__syscall_common |
