From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/arch/riscv/kernel/signal.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/kernel/arch/riscv/kernel/signal.c b/kernel/arch/riscv/kernel/signal.c
index 50a8225..dd63407 100644
--- a/kernel/arch/riscv/kernel/signal.c
+++ b/kernel/arch/riscv/kernel/signal.c
@@ -16,6 +16,7 @@
#include <asm/vdso.h>
#include <asm/switch_to.h>
#include <asm/csr.h>
+#include <asm/cacheflush.h>
extern u32 __user_rt_sigreturn[2];
@@ -178,6 +179,7 @@
{
struct rt_sigframe __user *frame;
long err = 0;
+ unsigned long __maybe_unused addr;
frame = get_sigframe(ksig, regs, sizeof(*frame));
if (!access_ok(frame, sizeof(*frame)))
@@ -206,7 +208,12 @@
if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
sizeof(frame->sigreturn_code)))
return -EFAULT;
- regs->ra = (unsigned long)&frame->sigreturn_code;
+
+ addr = (unsigned long)&frame->sigreturn_code;
+ /* Make sure the two instructions are pushed to icache. */
+ flush_icache_range(addr, addr + sizeof(frame->sigreturn_code));
+
+ regs->ra = addr;
#endif /* CONFIG_MMU */
/*
--
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