riscv: kprobes: allow writing to x0

Instructions can write to x0, so we should simulate these instructions
normally.

Currently, the kernel hangs if an instruction who writes to x0 is
simulated.

Fixes: c22b0bc ("riscv: Add kprobes supported")
Cc: [email protected]
Signed-off-by: Nam Cao <[email protected]>
Reviewed-by: Charlie Jenkins <[email protected]>
Acked-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: covanam

arch/riscv/kernel/probes/simulate-insn.c

@@ -24,7 +24,7 @@ static inline bool rv_insn_reg_set_val(struct pt_regs *regs, u32 index,
 				       unsigned long val)
 {
 	if (index == 0)
-		return false;
+		return true;
 	else if (index <= 31)
 		*((unsigned long *)regs + index) = val;
 	else