samples/kprobes: Add riscv support

Add riscv specific info dump in both handler_pre() and handler_post().

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

samples/kprobes/kprobe_example.c

@@ -47,6 +47,10 @@ static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs)
 	pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx, cpsr = 0x%lx\n",
 		p->symbol_name, p->addr, (long)regs->ARM_pc, (long)regs->ARM_cpsr);
 #endif
+#ifdef CONFIG_RISCV
+	pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx, status = 0x%lx\n",
+		p->symbol_name, p->addr, regs->epc, regs->status);
+#endif
 #ifdef CONFIG_S390
 	pr_info("<%s> pre_handler: p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n",
 		p->symbol_name, p->addr, regs->psw.addr, regs->flags);
@@ -80,6 +84,10 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
 	pr_info("<%s> post_handler: p->addr = 0x%p, cpsr = 0x%lx\n",
 		p->symbol_name, p->addr, (long)regs->ARM_cpsr);
 #endif
+#ifdef CONFIG_RISCV
+	pr_info("<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n",
+		p->symbol_name, p->addr, regs->status);
+#endif
 #ifdef CONFIG_S390
 	pr_info("<%s> pre_handler: p->addr, 0x%p, flags = 0x%lx\n",
 		p->symbol_name, p->addr, regs->flags);