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# See LICENSE for license details.

#*****************************************************************************

# scall.S

#-----------------------------------------------------------------------------

#

# Test syscall trap.

#

#include "riscv_test.h"

#include "compliance_test.h"

#include "compliance_io.h"

#include "aw_test_macros.h"

RVTEST_RV64S

RVTEST_CODE_BEGIN

#ifdef __MACHINE_MODE

  #define sscratch mscratch

  #define sstatus mstatus

  #define scause mcause

  #define sepc mepc

  #define sret mret

  #define stvec_handler mtvec_handler

  #undef SSTATUS_SPP

  #define SSTATUS_SPP MSTATUS_MPP

#endif

  li TESTNUM, 2

  SWSIG(2, TESTNUM)

  # This is the expected trap code.

  li t1, CAUSE_USER_ECALL

#ifdef __MACHINE_MODE

  # If running in M mode, use mstatus.MPP to check existence of U mode.

  # Otherwise, if in S mode, then U mode must exist and we don't need to check.

  li t0, MSTATUS_MPP

  csrc mstatus, t0

  csrr t2, mstatus

  and t0, t0, t2

  beqz t0, 1f

  # If U mode doesn't exist, mcause should indicate ECALL from M mode.

  li t1, CAUSE_MACHINE_ECALL

#endif

1:

  li t0, SSTATUS_SPP

  csrc sstatus, t0

  la t0, 1f

  csrw sepc, t0

  sret

1:

  li TESTNUM, 1

  SWSIG(1, TESTNUM)

do_scall:

  scall

  j fail

  TEST_PASSFAIL

  .align 2

  .global stvec_handler

stvec_handler:

  csrr t0, scause

  bne t0, t1, fail

  la t2, do_scall

  csrr t0, sepc

  bne t0, t2, fail

  j pass

RVTEST_CODE_END

  .data

RV_COMPLIANCE_DATA_BEGIN

test_res:

    .fill 40, 4, -1

RV_COMPLIANCE_DATA_END