diff options
Diffstat (limited to 'src/kernel/start.S')
| -rw-r--r-- | src/kernel/start.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/kernel/start.S b/src/kernel/start.S index bdf872d9d..d67cb7790 100644 --- a/src/kernel/start.S +++ b/src/kernel/start.S @@ -393,10 +393,18 @@ system_call_fast_path: ;// Results: ;// * TOC base -> GPR2 ;// * Function Address -> CTR - ;// * GPR1, GPR3 preserved. + ;// * GPR3 preserved. + ;// * Initial stack-frame created. ;// * Branch to CTR (no link). .global userspace_task_entry userspace_task_entry: + ;// Skip stack frame if GPR1 == NULL. + cmpi cr0, r1, 0 + beq- 1f + ;// Create frame. + ;// NULL back-chain + 48 bytes + quad-word alignment. See ABI. + stdu r1, -56(r1) +1: ld r5, 0(r4) mtctr r5 ld r2, 8(r4) |
