1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
# See LICENSE for license details.
#*****************************************************************************
# csr.S
#-----------------------------------------------------------------------------
#
# Test CSRRx and CSRRxI instructions.
#
#include "riscv_test.h"
#include "test_macros.h"
RVTEST_RV64S
RVTEST_CODE_BEGIN
#ifdef __MACHINE_MODE
#define sscratch mscratch
#define sstatus mstatus
#define scause mcause
#define sepc mepc
#define stvec_handler mtvec_handler
#undef SSTATUS_SPP
#define SSTATUS_SPP MSTATUS_MPP
#endif
csrwi sscratch, 3
TEST_CASE( 2, a0, 3, csrr a0, sscratch);
TEST_CASE( 3, a1, 3, csrrci a1, sscratch, 1);
TEST_CASE( 4, a2, 2, csrrsi a2, sscratch, 4);
TEST_CASE( 5, a3, 6, csrrwi a3, sscratch, 2);
TEST_CASE( 6, a1, 2, li a0, 0xbad1dea; csrrw a1, sscratch, a0);
TEST_CASE( 7, a0, 0xbad1dea, li a0, 0x0001dea; csrrc a0, sscratch, a0);
TEST_CASE( 8, a0, 0xbad0000, li a0, 0x000beef; csrrs a0, sscratch, a0);
TEST_CASE( 9, a0, 0xbadbeef, csrr a0, sscratch);
# Make sure writing the cycle counter causes an exception.
TEST_CASE(10, a0, 255, li a0, 255; csrrw a0, cycle, x0);
# jump to user land
li t0, SSTATUS_SPP
csrc sstatus, t0
la t0, 1f
csrw sepc, t0
sret
1:
# Make sure reading status in user mode causes an exception.
TEST_CASE(11, a0, 255, li a0, 255; csrr a0, sstatus);
# Exit by doing a syscall.
TEST_CASE(12, x0, 1, scall)
# We should only fall through to this if scall failed.
TEST_PASSFAIL
stvec_handler:
# Trapping on tests 11 and 12 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, 11
beq TESTNUM, t0, syscall
# Trapping on other tests is bad news.
j fail
privileged:
# Make sure scause indicates a lack of privilege.
csrr t0, scause
li t1, CAUSE_ILLEGAL_INSTRUCTION
bne t0, t1, fail
# Return to user mode, but skip the trapping instruction.
csrr t0, sepc
addi t0, t0, 4
csrw sepc, t0
sret
syscall:
# Make sure scause indicates a syscall.
csrr t0, scause
li t1, CAUSE_USER_ECALL
bne t0, t1, fail
# We're done.
j pass
RVTEST_CODE_END
.data
RVTEST_DATA_BEGIN
TEST_DATA
RVTEST_DATA_END
|
