v/entry.S: replace sbadaddr with stval

The RISC-V Privileged ISA v1.10 uses stval instead of
sbadaddr. Although GCC can cope with sbadaddr, clang cannot. It fails
with:

  error: operand must be a valid system register name or an integer in
  the range [0, 4095]

1 files changed, 1 insertions, 1 deletions

diff --git a/v/entry.S b/v/entry.S
index fa492e6..49b2d3e 100644
--- a/v/entry.S
+++ b/v/entry.S
@@ -153,7 +153,7 @@ trap_entry:
   STORE  t0,32*REGBYTES(sp)
   csrr   t0,sepc
   STORE  t0,33*REGBYTES(sp)
-  csrr   t0,sbadaddr
+  csrr   t0,stval
   STORE  t0,34*REGBYTES(sp)
   csrr   t0,scause
   STORE  t0,35*REGBYTES(sp)