nsz Git - musl/blob - src/internal/ppc/syscall.S

   1 #include <bits/asm.h>
   2         .global __syscall
   3         .type   __syscall,@function
   4 __syscall:
   5         mflr    r0
   6         stw     r0, -4(r1)              // Save the return address.
   7         mr      r0, r3                  // Save the system call number
   8         mr      r3, r4                  // Shift the arguments: arg1
   9         mr      r4, r5                  // arg2
  10         mr      r5, r6                  // arg3
  11         mr      r6, r7                  // arg4
  12         mr      r7, r8                  // arg5
  13         mr      r8, r9                  // arg6
  14         sc
  15         mfcr    r0                      // Check for an error
  16         rlwinm  r4, r0, r0, 3, 3        // by checking for bit 28.
  17         cmplwi  r0, r4, 0               // It is an error if non-zero.
  18         beq     r0, 1f                  // Jump if not an error.
  19         neg     r3, r3                  // Negate the error number.
  20 1:      lwz     r0, -4(r1)              // Restore the return address.
  21         mtlr    r0
  22         blr
  23         .end    __syscall
  24         .size   __syscall, .-__syscall