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| author | Patrick Williams <iawillia@us.ibm.com> | 2011-08-22 10:34:45 -0500 |
|---|---|---|
| committer | A. Patrick Williams III <iawillia@us.ibm.com> | 2011-08-22 12:24:55 -0500 |
| commit | c6571028ca3b54ba0a4ec73d1f39fdeba6c79fb9 (patch) | |
| tree | 4275488285e93e4c2386a6c3fc2f1f7855d2a03a /src/kernel/start.S | |
| parent | d329a4202e1f4a8b3283e31e2dfb5a838c49796e (diff) | |
| download | talos-hostboot-c6571028ca3b54ba0a4ec73d1f39fdeba6c79fb9.tar.gz talos-hostboot-c6571028ca3b54ba0a4ec73d1f39fdeba6c79fb9.zip | |
Create initial stack-frame from userspace.
Change-Id: Ie1133bd079e7b9a8f2f82daa06efc426bf0fd0d6
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/268
Tested-by: Jenkins Server
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
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) |
