import preliminary ppc work by rdp.

[musl] / src / internal / ppc / syscall.S

diff --git a/src/internal/ppc/syscall.S b/src/internal/ppc/syscall.S
new file mode 100644 (file)
index 0000000..e56abc6
--- /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