add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/kernel/signal.c
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@@ -16,6 +16,7 @@
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 #include <asm/vdso.h>
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 #include <asm/switch_to.h>
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 #include <asm/csr.h>
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+#include <asm/cacheflush.h>
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 extern u32 __user_rt_sigreturn[2];
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@@ -178,6 +179,7 @@
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 {
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 	struct rt_sigframe __user *frame;
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 	long err = 0;
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+	unsigned long __maybe_unused addr;
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 	frame = get_sigframe(ksig, regs, sizeof(*frame));
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 	if (!access_ok(frame, sizeof(*frame)))
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@@ -206,7 +208,12 @@
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 	if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
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 			 sizeof(frame->sigreturn_code)))
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 		return -EFAULT;
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-	regs->ra = (unsigned long)&frame->sigreturn_code;
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+
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+	addr = (unsigned long)&frame->sigreturn_code;
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+	/* Make sure the two instructions are pushed to icache. */
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+	flush_icache_range(addr, addr + sizeof(frame->sigreturn_code));
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+
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+	regs->ra = addr;
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 #endif /* CONFIG_MMU */
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 	/*