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#*****************************************************************************
# csr.S
#-----------------------------------------------------------------------------
#
# Test CSRRx and CSRRxI instructions.
#
#include "riscv_test.h"
#include "test_macros.h"
RVTEST_RV64S
RVTEST_CODE_BEGIN
# Set up evec in case we trap.
la t0, evec
csrw evec, t0
csrwi count, 0
csrwi sup0, 3
TEST_CASE( 2, a0, 3, csrr a0, sup0);
TEST_CASE( 3, a1, 3, csrrci a1, sup0, 1);
TEST_CASE( 4, a2, 2, csrrsi a2, sup0, 4);
TEST_CASE( 5, a3, 6, csrrwi a3, sup0, 2);
TEST_CASE( 6, a1, 2, li a0, 0xbad1dea; csrrw a1, sup0, a0);
TEST_CASE( 7, a0, 0xbad1dea, li a0, 0x0001dea; csrrc a0, sup0, a0);
TEST_CASE( 8, a0, 0xbad0000, li a0, 0x000beef; csrrs a0, sup0, a0);
TEST_CASE( 9, a0, 0xbadbeef, csrr a0, sup0);
# Make sure writing the cycle counter causes an exception.
TEST_CASE(10, a0, 255, li a0, 255; csrrw a0, cycle, x0);
# Make sure reading status in user mode causes an exception.
csrci status, SR_S|SR_PS
TEST_CASE(11, a0, 255, li a0, 255; csrr a0, status);
# Make sure rdcycle is legal in user mode.
TEST_CASE(12, x0, 0, rdcycle a0)
# Exit by doing a syscall.
TEST_CASE(13, x0, 1, scall)
# We should only fall through to this if scall failed.
TEST_PASSFAIL
evec:
# Trapping on tests 10, 11, and 13 is usually good news.
# Note that since the test didn't complete, TESTNUM is smaller by 1.
li t0, 9
beq TESTNUM, t0, privileged
li t0, 10
beq TESTNUM, t0, privileged
li t0, 12
beq TESTNUM, t0, syscall
# Trapping on other tests is bad news.
j fail
privileged:
# Make sure CAUSE indicates a lack of privilege.
csrr t0, cause
li t1, CAUSE_PRIVILEGED_INSTRUCTION
bne t0, t1, fail
# Return to user mode, but skip the trapping instruction.
csrr t0, epc
addi t0, t0, 4
csrw epc, t0
sret
syscall:
# Make sure CAUSE indicates a syscall.
csrr t0, cause
li t1, CAUSE_SYSCALL
bne t0, t1, fail
# We're done.
j pass
RVTEST_CODE_END
.data
RVTEST_DATA_BEGIN
TEST_DATA
RVTEST_DATA_END
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