isa/rv64si/csr.S

   1 # See LICENSE for license details.
   2
   3 #*****************************************************************************
   4 # csr.S
   5 #-----------------------------------------------------------------------------
   6 #
   7 # Test CSRRx and CSRRxI instructions.
   8 #
   9
  10 #include "riscv_test.h"
  11 #include "test_macros.h"
  12
  13 RVTEST_RV64S
  14 RVTEST_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 stvec_handler mtvec_handler
  22   #undef SSTATUS_PS
  23   #define SSTATUS_PS MSTATUS_PRV1
  24 #endif
  25
  26   csrwi cyclew, 0
  27
  28   csrwi sscratch, 3
  29   TEST_CASE( 2, a0,         3, csrr a0, sscratch);
  30   TEST_CASE( 3, a1,         3, csrrci a1, sscratch, 1);
  31   TEST_CASE( 4, a2,         2, csrrsi a2, sscratch, 4);
  32   TEST_CASE( 5, a3,         6, csrrwi a3, sscratch, 2);
  33   TEST_CASE( 6, a1,         2, li a0, 0xbad1dea; csrrw a1, sscratch, a0);
  34   TEST_CASE( 7, a0, 0xbad1dea, li a0, 0x0001dea; csrrc a0, sscratch, a0);
  35   TEST_CASE( 8, a0, 0xbad0000, li a0, 0x000beef; csrrs a0, sscratch, a0);
  36   TEST_CASE( 9, a0, 0xbadbeef, csrr a0, sscratch);
  37
  38   # Make sure writing the cycle counter causes an exception.
  39   TEST_CASE(10, a0, 255, li a0, 255; csrrw a0, cycle, x0);
  40
  41   # jump to user land
  42   li t0, SSTATUS_PS
  43   csrc sstatus, t0
  44   la t0, 1f
  45   csrw sepc, t0
  46   sret
  47   1:
  48
  49   # Make sure reading status in user mode causes an exception.
  50   TEST_CASE(11, a0, 255, li a0, 255; csrr a0, sstatus);
  51
  52   # Make sure rdcycle is legal in user mode.
  53   TEST_CASE(12, x0, 0, rdcycle a0)
  54
  55   # Exit by doing a syscall.
  56   TEST_CASE(13, x0, 1, scall)
  57
  58   # We should only fall through to this if scall failed.
  59   TEST_PASSFAIL
  60
  61 stvec_handler:
  62   # Trapping on tests 10, 11, and 13 is usually good news.
  63   # Note that since the test didn't complete, TESTNUM is smaller by 1.
  64   li t0, 9
  65   beq TESTNUM, t0, privileged
  66   li t0, 10
  67   beq TESTNUM, t0, privileged
  68   li t0, 12
  69   beq TESTNUM, t0, syscall
  70
  71   # Trapping on other tests is bad news.
  72   j fail
  73
  74 privileged:
  75   # Make sure scause indicates a lack of privilege.
  76   csrr t0, scause
  77   li t1, CAUSE_ILLEGAL_INSTRUCTION
  78   bne t0, t1, fail
  79   # Return to user mode, but skip the trapping instruction.
  80   csrr t0, sepc
  81   addi t0, t0, 4
  82   csrw sepc, t0
  83   sret
  84
  85 syscall:
  86   # Make sure scause indicates a syscall.
  87   csrr t0, scause
  88   li t1, CAUSE_USER_ECALL
  89   bne t0, t1, fail
  90
  91   # We're done.
  92   j pass
  93
  94 RVTEST_CODE_END
  95
  96   .data
  97 RVTEST_DATA_BEGIN
  98
  99   TEST_DATA
 100
 101 RVTEST_DATA_END