| Bobby Bingham | 3a3c813 | 2013-10-05 05:13:18 -0500 | [diff] [blame] | 1 | .text |
| 2 | .global __clone |
| 3 | .type __clone, @function |
| 4 | __clone: |
| 5 | ! incoming: fn stack flags arg ptid tls ctid |
| 6 | ! r4 r5 r6 r7 @r15 @(4,r15) @(8,r15) |
| 7 | |
| 8 | mov #-16, r0 |
| 9 | and r0, r5 |
| 10 | |
| 11 | mov r4, r1 ! r1 = fn |
| 12 | mov r7, r2 ! r2 = arg |
| 13 | |
| 14 | mov #120, r3 ! r3 = __NR_clone |
| 15 | mov r6, r4 ! r4 = flags |
| 16 | !mov r5, r5 ! r5 = stack |
| 17 | mov.l @r15, r6 ! r6 = ptid |
| 18 | mov.l @(8,r15), r7 ! r7 = ctid |
| 19 | mov.l @(4,r15), r0 ! r0 = tls |
| Rich Felker | 10d0268 | 2015-06-16 15:25:02 +0000 | [diff] [blame^] | 20 | trapa #31 |
| Bobby Bingham | 3a3c813 | 2013-10-05 05:13:18 -0500 | [diff] [blame] | 21 | |
| 22 | or r0, r0 |
| 23 | or r0, r0 |
| 24 | or r0, r0 |
| 25 | or r0, r0 |
| 26 | or r0, r0 |
| 27 | |
| 28 | cmp/eq #0, r0 |
| 29 | bt 1f |
| 30 | |
| 31 | ! we are the parent, return |
| 32 | rts |
| 33 | nop |
| 34 | |
| 35 | 1: ! we are the child, call fn(arg) |
| 36 | jsr @r1 |
| 37 | mov r2, r4 |
| 38 | |
| 39 | mov #1, r3 ! __NR_exit |
| 40 | mov r0, r4 |
| Rich Felker | 10d0268 | 2015-06-16 15:25:02 +0000 | [diff] [blame^] | 41 | trapa #31 |
| Bobby Bingham | 3a3c813 | 2013-10-05 05:13:18 -0500 | [diff] [blame] | 42 | |
| 43 | or r0, r0 |
| 44 | or r0, r0 |
| 45 | or r0, r0 |
| 46 | or r0, r0 |
| 47 | or r0, r0 |