From 7669d1e334e6b96455eece78da43bf830b93d697 Mon Sep 17 00:00:00 2001
From: Richard Pennington <rich@pennware.com>
Date: Fri, 9 Nov 2012 23:32:57 +0100
Subject: import preliminary ppc work by rdp.

---
 src/internal/ppc/syscall.S | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/internal/ppc/syscall.S

(limited to 'src/internal')

diff --git a/src/internal/ppc/syscall.S b/src/internal/ppc/syscall.S
new file mode 100644
index 00000000..e56abc6f
--- /dev/null
+++ b/src/internal/ppc/syscall.S
@@ -0,0 +1,24 @@
+#include <bits/asm.h>
+        .global __syscall
+        .type   __syscall,@function
+__syscall:
+        mflr    r0
+        stw     r0, -4(r1)              // Save the return address.
+        mr      r0, r3                  // Save the system call number
+        mr      r3, r4                  // Shift the arguments: arg1
+        mr      r4, r5                  // arg2
+        mr      r5, r6                  // arg3
+        mr      r6, r7                  // arg4
+        mr      r7, r8                  // arg5
+        mr      r8, r9                  // arg6
+        sc
+        mfcr    r0                      // Check for an error
+        rlwinm  r4, r0, r0, 3, 3        // by checking for bit 28.
+        cmplwi  r0, r4, 0               // It is an error if non-zero.
+        beq     r0, 1f                  // Jump if not an error.
+        neg     r3, r3                  // Negate the error number.
+1:      lwz     r0, -4(r1)              // Restore the return address.
+        mtlr    r0
+	blr
+        .end    __syscall
+        .size   __syscall, .-__syscall
-- 
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