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//------------------------------------------------------------------------
// This code tests amoswap.d instruction in multi-threading system.
// All threads execute a critical section LOOP_COUNT times. A thread
// gets into a critical section by acquiring a lock variable (i.e.,
// shared_var) and checking return value.
// 0 means the lock is not being locked. Each thread increments
// a variable (i.e., var) inside the critical section and releases the
// lock by swapping back 0 to the lock variable.
// The master thread (i.e., thread 0) waits for all threads to complete
// and compare the var's value to the expected result.
//------------------------------------------------------------------------
#include "riscv_test.h"
#include "test_macros.h"
#include "test_macros_mt_rv32.h"
RVTEST_RV32U
RVTEST_CODE_BEGIN
#define LOOP_COUNT 1000
#define RESULT NUM_THREADS * LOOP_COUNT
//------------------------------------------------------------------------
// Master thread creates new threads, waits for all threads to complete,
// deallocates threads and checks result
//------------------------------------------------------------------------
call _create_threads
call _join
call _delete_threads
call _check
RVTEST_CODE_END
//------------------------------------------------------------------------
// mt_test function executed in child threads
// A child thread signals its completion by atomicaly adding 1 to barrier
//------------------------------------------------------------------------
_mt_test:
li t0, 1 // initialize the swap value (1-locked)
li t1, LOOP_COUNT
la t2, var // load the var's address
la a0, shared_var
1:
amoswap.w.aq s2, t0, (a0) // try to swap t0 with the lock
bnez s2, 1b // retry if the lock is being held
lw t3, (t2) // load the var's value
addi t3, t3, 1 // add 1 to the value
sw t3, (t2) // store the new value to var
amoswap.w.rl zero, zero, (a0)// release the lock by swapping back 0
addi t1, t1, -1 // decrement the loop_count
bnez t1, 1b // repeat if not done yet
la a0, barrier
amoadd.w zero, t0, (a0) // signal this thread's completion
RVTEST_CODE_END
//------------------------------------------------------------------------
// Master thread checks result
//------------------------------------------------------------------------
_check:
la a0, var
li a1, RESULT
lw a0, (a0)
bne a0, a1, _fail
li a0, SUCCESS
ret
_fail:
li a0, FAILURE
ret
.data
MT_DATA
var: .word 0