diff options
Diffstat (limited to 'isa')
| -rw-r--r-- | isa/rv64si/csr.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/isa/rv64si/csr.S b/isa/rv64si/csr.S index 83e9cae..292e298 100644 --- a/isa/rv64si/csr.S +++ b/isa/rv64si/csr.S @@ -26,7 +26,23 @@ RVTEST_CODE_BEGIN # For RV64, make sure UXL encodes RV64. (UXL does not exist for RV32.) #if __riscv_xlen == 64 + # If running in M mode, read misa to check existence of U mode. + # Otherwise, if in S mode, then U mode must exist and we don't need to check. +#ifdef __MACHINE_MODE + csrr a0, misa + srli a0, a0, 'U' - 'A' + andi a0, a0, 1 + beqz a0, 1f +#endif + # If U mode is present, UXL should be 2 (XLEN = 64-bit) TEST_CASE(13, a0, SSTATUS_UXL & (SSTATUS_UXL << 1), csrr a0, sstatus; li a1, SSTATUS_UXL; and a0, a0, a1) +#ifdef __MACHINE_MODE + j 2f +1: + # If U mode is not present, UXL should be 0 + TEST_CASE(14, a0, 0, csrr a0, sstatus; li a1, SSTATUS_UXL; and a0, a0, a1) +2: +#endif #endif csrwi sscratch, 3 |