isa/rv64si/csr.S

   1 #*****************************************************************************
   2 # csr.S
   3 #-----------------------------------------------------------------------------
   4 #
   5 # Test CSRRx and CSRRxI instructions.
   6 #
   7
   8 #include "riscv_test.h"
   9 #include "test_macros.h"
  10
  11 RVTEST_RV64S
  12 RVTEST_CODE_BEGIN
  13
  14   # Set up evec in case we trap.
  15   la t0, evec
  16   csrw evec, t0
  17   csrwi count, 0
  18
  19   csrwi sup0, 3
  20   TEST_CASE( 2, a0,         3, csrr a0, sup0);
  21   TEST_CASE( 3, a1,         3, csrrci a1, sup0, 1);
  22   TEST_CASE( 4, a2,         2, csrrsi a2, sup0, 4);
  23   TEST_CASE( 5, a3,         6, csrrwi a3, sup0, 2);
  24   TEST_CASE( 6, a1,         2, li a0, 0xbad1dea; csrrw a1, sup0, a0);
  25   TEST_CASE( 7, a0, 0xbad1dea, li a0, 0x0001dea; csrrc a0, sup0, a0);
  26   TEST_CASE( 8, a0, 0xbad0000, li a0, 0x000beef; csrrs a0, sup0, a0);
  27   TEST_CASE( 9, a0, 0xbadbeef, csrr a0, sup0);
  28
  29   # Make sure writing the cycle counter causes an exception.
  30   TEST_CASE(10, a0, 255, li a0, 255; csrrw a0, cycle, x0);
  31
  32   # Make sure reading status in user mode causes an exception.
  33   csrci status, SR_S|SR_PS
  34   TEST_CASE(11, a0, 255, li a0, 255; csrr a0, status);
  35
  36   # Make sure rdcycle is legal in user mode.
  37   TEST_CASE(12, x0, 0, rdcycle a0)
  38
  39   # Exit by doing a syscall.
  40   TEST_CASE(13, x0, 1, scall)
  41
  42   # We should only fall through to this if scall failed.
  43   TEST_PASSFAIL
  44
  45 evec:
  46   # Trapping on tests 10, 11, and 13 is usually good news.
  47   # Note that since the test didn't complete, TESTNUM is smaller by 1.
  48   li t0, 9
  49   beq TESTNUM, t0, privileged
  50   li t0, 10
  51   beq TESTNUM, t0, privileged
  52   li t0, 12
  53   beq TESTNUM, t0, syscall
  54
  55   # Trapping on other tests is bad news.
  56   j fail
  57
  58 privileged:
  59   # Make sure CAUSE indicates a lack of privilege.
  60   csrr t0, cause
  61   li t1, CAUSE_PRIVILEGED_INSTRUCTION
  62   bne t0, t1, fail
  63   # Return to user mode, but skip the trapping instruction.
  64   csrr t0, epc
  65   addi t0, t0, 4
  66   csrw epc, t0
  67   sret
  68
  69 syscall:
  70   # Make sure CAUSE indicates a syscall.
  71   csrr t0, cause
  72   li t1, CAUSE_SYSCALL
  73   bne t0, t1, fail
  74
  75   # We're done.
  76   j pass
  77
  78 RVTEST_CODE_END
  79
  80   .data
  81 RVTEST_DATA_BEGIN
  82
  83   TEST_DATA
  84
  85 RVTEST_DATA_END