// This is NEW CODE to implement the sync operations supported by other C compilers

#include "sync.h"

#ifdef _ZCC

void __naked __sync_synchronize() __asm {
	//fence
	fence rw,rw
	ret
}
unsigned int __naked __sync_lock_test_and_set(unsigned int* p, unsigned int v) __asm {
	amoswap.w.aq a1, a1, (a0)
	mv a0, a1
	ret
	//   a5 = 1
  //   s1 = &lk->locked
  //   amoswap.w.aq a5, a5, (s1)
	//uint old = *p;
	// *p = v;
	//return old;
}
void __naked __sync_lock_release(unsigned int* p) __asm {
	amoswap.w zero, zero, (a0)
	ret
	// *p = 0;
}
/*
void __naked __sync_synchronize() __asm {
	addi	sp,sp,-16
	sd	s0,8(sp)
	addi	s0,sp,16
	fence	rw,rw
	nop
	ld	s0,8(sp)
	addi	sp,sp,16
	jr	ra
}
uint __naked __sync_lock_test_and_set(uint*p, uint v) __asm {
	addi	sp,sp,-32
	sd	s0,24(sp)
	addi	s0,sp,32
	sd	a0,-24(s0)
	mv	a5,a1
	sw	a5,-28(s0)
	ld	a5,-24(s0)
	lw	a4,-28(s0)
	amoswap.w.aq	a4,a4,0(a5)
	sext.w	a5,a4
	mv	a0,a5
	ld	s0,24(sp)
	addi	sp,sp,32
	jr	ra
}
void __naked __sync_lock_release(uint* p) __asm {
	addi	sp,sp,-32
	sd	s0,24(sp)
	addi	s0,sp,32
	sd	a0,-24(s0)
	ld	a5,-24(s0)
	fence	rw,w
	sw	zero,0(a5)
	nop
	ld	s0,24(sp)
	addi	sp,sp,32
	jr	ra
}
*/
#endif