[PATCH v1] lib: sbi_illegal_insn: Fix FENCE.TSO emulation infinite trap loop

[Rahul Pathak]

In case of missing "FENCE.TSO" instruction implementation,
opensbi can emulate the "FENCE.TSO" with "FENCE RW,RW", but
mepc was not incremented to continue from the next instruction
causing infinite trap.

Fixes: cb8271c8 ("lib: sbi_illegal_insn: Add emulation for fence.tso")
Signed-off-by: Rahul Pathak <rpathak at ventanamicro.com>
Reviewed-by: Andrew Jones <ajones at ventanamicro.com>
---
 lib/sbi/sbi_illegal_insn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/sbi/sbi_illegal_insn.c b/lib/sbi/sbi_illegal_insn.c
index 84c04f8..53e9320 100644
--- a/lib/sbi/sbi_illegal_insn.c
+++ b/lib/sbi/sbi_illegal_insn.c
@@ -39,6 +39,7 @@ static int misc_mem_opcode_insn(ulong insn, struct sbi_trap_regs *regs)
 	/* Errata workaround: emulate `fence.tso` as `fence rw, rw`. */
 	if ((insn & INSN_MASK_FENCE_TSO) == INSN_MATCH_FENCE_TSO) {
 		smp_mb();
+		regs->mepc += 4;
 		return 0;
 	}
 
-- 
2.34.1