scall.S revision 12771:75508af5d8dc 
1# See LICENSE for license details.
2
3#*****************************************************************************
4# scall.S
5#-----------------------------------------------------------------------------
6#
7# Test syscall trap.
8#
9
10#include "riscv_test.h"
11#include "test_macros.h"
12
13RVTEST_RV64S
14RVTEST_CODE_BEGIN
15
16#ifdef __MACHINE_MODE
17  #define sscratch mscratch
18  #define sstatus mstatus
19  #define scause mcause
20  #define sepc mepc
21  #define sret mret
22  #define stvec_handler mtvec_handler
23  #undef SSTATUS_SPP
24  #define SSTATUS_SPP MSTATUS_MPP
25#endif
26
27  li TESTNUM, 2
28
29  # This is the expected trap code.
30  li t1, CAUSE_USER_ECALL
31
32#ifdef __MACHINE_MODE
33  # If running in M mode, use mstatus.MPP to check existence of U mode.
34  # Otherwise, if in S mode, then U mode must exist and we don't need to check.
35  li t0, MSTATUS_MPP
36  csrc mstatus, t0
37  csrr t1, mstatus
38  and t0, t0, t1
39  beqz t0, 1f
40
41  # If U mode doesn't exist, mcause should indicate ECALL from M mode.
42  li t1, CAUSE_MACHINE_ECALL
43#endif
44
451:
46  li t0, SSTATUS_SPP
47  csrc sstatus, t0
48  la t0, 1f
49  csrw sepc, t0
50  sret
511:
52
53  li TESTNUM, 1
54do_scall:
55  scall
56  j fail
57
58  TEST_PASSFAIL
59
60  .align 2
61  .global stvec_handler
62stvec_handler:
63  csrr t0, scause
64  bne t0, t1, fail
65  la t2, do_scall
66  csrr t0, sepc
67  bne t0, t2, fail
68  j pass
69
70RVTEST_CODE_END
71
72  .data
73RVTEST_DATA_BEGIN
74
75  TEST_DATA
76
77RVTEST_DATA_END
78