X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=isa%2Frv64si%2Fcsr.S;h=292e298608b8816def05c98ff14a46c898811c4e;hb=bb14a75c0b938dcbb308a5304ea0c3f30c3fceef;hp=2a326a6cc807a0de79b11190651859328f25c02c;hpb=7864b6441aad0bca337eb70fcd12394cc68bddc6;p=riscv-tests.git

diff --git a/isa/rv64si/csr.S b/isa/rv64si/csr.S
index 2a326a6..292e298 100644
--- a/isa/rv64si/csr.S
+++ b/isa/rv64si/csr.S
@@ -13,10 +13,37 @@
 RVTEST_RV64S
 RVTEST_CODE_BEGIN
 
-  # Set up stvec in case we trap.
-  la t0, stvec
-  csrw stvec, t0
-  csrwi scycle, 0
+#ifdef __MACHINE_MODE
+  #define sscratch mscratch
+  #define sstatus mstatus
+  #define scause mcause
+  #define sepc mepc
+  #define sret mret
+  #define stvec_handler mtvec_handler
+  #undef SSTATUS_SPP
+  #define SSTATUS_SPP MSTATUS_MPP
+#endif
+
+  # 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
   TEST_CASE( 2, a0,         3, csrr a0, sscratch);
@@ -28,44 +55,78 @@ RVTEST_CODE_BEGIN
   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);
-
-  # Enter user mode
-  li t0, SSTATUS_PS
+#ifdef __MACHINE_MODE
+  # Is F extension present?
+  csrr a0, misa
+  andi a0, a0, (1 << ('F' - 'A'))
+  beqz a0, 1f
+  # If so, make sure FP stores have no effect when mstatus.FS is off.
+  li a1, MSTATUS_FS
+  csrs mstatus, a1
+#ifdef __riscv_flen
+  fmv.s.x f0, x0
+  csrc mstatus, a1
+  la a1, fsw_data
+  TEST_CASE(10, a0, 1, fsw f0, (a1); lw a0, (a1));
+#else
+  # Fail if this test is compiled without F but executed on a core with F.
+  TEST_CASE(10, zero, 1)
+#endif
+1:
+
+  # Figure out if 'U' is set in misa
+  csrr a0, misa   # a0 = csr(misa)
+  srli a0, a0, 20 # a0 = a0 >> 20
+  andi a0, a0, 1  # a0 = a0 & 1
+  beqz a0, finish # if no user mode, skip the rest of these checks
+#endif /* __MACHINE_MODE */
+
+  # 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);
+  # Make sure writing the cycle counter causes an exception.
+  # Don't run in supervisor, as we don't delegate illegal instruction traps.
+#ifdef __MACHINE_MODE
+  TEST_CASE(11, a0, 255, li a0, 255; csrrw a0, cycle, x0);
+#endif
 
-  # Make sure rdcycle is legal in user mode.
-  TEST_CASE(12, x0, 0, rdcycle a0)
+  # Make sure reading status in user mode causes an exception.
+  # Don't run in supervisor, as we don't delegate illegal instruction traps.
+#ifdef __MACHINE_MODE
+  TEST_CASE(12, a0, 255, li a0, 255; csrr a0, sstatus)
+#else
+  TEST_CASE(12, x0, 0, nop)
+#endif
 
-  # Exit by doing a syscall.
-  TEST_CASE(13, x0, 1, scall)
+finish:
+  RVTEST_PASS
 
   # We should only fall through to this if scall failed.
   TEST_PASSFAIL
 
-stvec:
-  # Trapping on tests 10, 11, and 13 is usually good news.
+  .align 2
+stvec_handler:
+  # Trapping on tests 10-12 is 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, 12
-  beq TESTNUM, t0, syscall
+  bltu TESTNUM, t0, 1f
+  li t0, 11
+  bleu TESTNUM, t0, privileged
+1:
 
-  # Trapping on other tests is bad news.
-  j fail
+  # catch RVTEST_PASS and kick it up to M-mode
+  csrr t0, scause
+  li t1, CAUSE_USER_ECALL
+  bne t0, t1, fail
+  RVTEST_PASS
 
 privileged:
-  # Make sure CAUSE indicates a lack of privilege.
+  # Make sure scause indicates a lack of privilege.
   csrr t0, scause
   li t1, CAUSE_ILLEGAL_INSTRUCTION
   bne t0, t1, fail
@@ -75,20 +136,11 @@ privileged:
   csrw sepc, t0
   sret
 
-syscall:
-  # Make sure CAUSE indicates a syscall.
-  csrr t0, scause
-  li t1, CAUSE_SCALL
-  bne t0, t1, fail
-
-  # We're done.
-  j pass
-
 RVTEST_CODE_END
 
   .data
 RVTEST_DATA_BEGIN
 
-  TEST_DATA
+fsw_data: .word 1
 
 RVTEST_DATA_END