// This function is used to check for the CPU's support for the sdiv
// instruction at runtime.  It will either return the value 1 or
// will cause an invalid instruction trap (SIGILL signal).  The
// caller must arrange for the signal handler to set the r0
// register to 0 and move the pc forward by 4 bytes (to skip
// the invalid instruction).


#include "asm_support_arm.S"

.section .text
ENTRY CheckForARMSDIVInstruction
  mov r1,#1
  // depending on the architecture, the assembler will not allow an
  // sdiv instruction, so we will have to output the bytes directly.

  // sdiv r0,r1,r1 is two words: 0xfb91 0xf1f0.  We need little endian.
  .byte 0x91,0xfb,0xf1,0xf0

  // if the divide worked, r0 will have the value #1 (result of sdiv).
  // It will have 0 otherwise (set by the signal handler)
  // the value is just returned from this function.
  bx lr
  END CheckForARMSDIVInstruction