switch_riscv_unix.h

#define STACK_REFPLUS 1
 
#ifdef SLP_EVAL
#define STACK_MAGIC 0
 
#define REGS_TO_SAVE "s1", "s2", "s3", "s4", "s5", \
             "s6", "s7", "s8", "s9", "s10", "s11", "fs0", "fs1", \
             "fs2", "fs3", "fs4", "fs5", "fs6", "fs7", "fs8", "fs9", \
             "fs10", "fs11"
 
static int
slp_switch(void)
{
  int ret;
  long fp;
  long *stackref, stsizediff;
 
  __asm__ volatile ("" : : : REGS_TO_SAVE);
  __asm__ volatile ("mv %0, fp" : "=r" (fp) : );
  __asm__ volatile ("mv %0, sp" : "=r" (stackref) : );
  {
      SLP_SAVE_STATE(stackref, stsizediff);
      __asm__ volatile (
      "add sp, sp, %0\n\t"
      "add fp, fp, %0\n\t"
      : /* no outputs */
      : "r" (stsizediff)
      );
      SLP_RESTORE_STATE();
  }
  __asm__ volatile ("" : : : REGS_TO_SAVE);
#if __riscv_xlen == 32
  __asm__ volatile ("lw fp, %0" : : "m" (fp));
#else
  __asm__ volatile ("ld fp, %0" : : "m" (fp));
#endif
  __asm__ volatile ("mv %0, zero" : "=r" (ret) : );
  return ret;
}
 
#endif