add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nds32/kernel/signal.c
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@@ -12,6 +12,7 @@
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 #include <asm/cacheflush.h>
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 #include <asm/ucontext.h>
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 #include <asm/unistd.h>
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+#include <asm/fpu.h>
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 #include <asm/ptrace.h>
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 #include <asm/vdso.h>
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@@ -20,6 +21,60 @@
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 	struct siginfo info;
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 	struct ucontext uc;
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 };
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+#if IS_ENABLED(CONFIG_FPU)
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+static inline int restore_sigcontext_fpu(struct pt_regs *regs,
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+					 struct sigcontext __user *sc)
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+{
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+	struct task_struct *tsk = current;
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+	unsigned long used_math_flag;
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+	int ret = 0;
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+
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+	clear_used_math();
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+	__get_user_error(used_math_flag, &sc->used_math_flag, ret);
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+
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+	if (!used_math_flag)
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+		return 0;
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+	set_used_math();
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+
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+#if IS_ENABLED(CONFIG_LAZY_FPU)
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+	preempt_disable();
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+	if (current == last_task_used_math) {
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+		last_task_used_math = NULL;
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+		disable_ptreg_fpu(regs);
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+	}
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+	preempt_enable();
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+#else
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+	clear_fpu(regs);
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+#endif
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+
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+	return __copy_from_user(&tsk->thread.fpu, &sc->fpu,
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+				sizeof(struct fpu_struct));
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+}
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+
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+static inline int setup_sigcontext_fpu(struct pt_regs *regs,
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+				       struct sigcontext __user *sc)
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+{
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+	struct task_struct *tsk = current;
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+	int ret = 0;
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+
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+	__put_user_error(used_math(), &sc->used_math_flag, ret);
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+
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+	if (!used_math())
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+		return ret;
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+
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+	preempt_disable();
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+#if IS_ENABLED(CONFIG_LAZY_FPU)
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+	if (last_task_used_math == tsk)
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+		save_fpu(last_task_used_math);
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+#else
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+	unlazy_fpu(tsk);
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+#endif
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+	ret = __copy_to_user(&sc->fpu, &tsk->thread.fpu,
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+			     sizeof(struct fpu_struct));
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+	preempt_enable();
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+	return ret;
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+}
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+#endif
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 static int restore_sigframe(struct pt_regs *regs,
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 			    struct rt_sigframe __user * sf)
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@@ -69,7 +124,9 @@
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 	__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
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 	__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
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 #endif
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-
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+#if IS_ENABLED(CONFIG_FPU)
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+	err |= restore_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
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+#endif
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 	/*
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 	 * Avoid sys_rt_sigreturn() restarting.
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 	 */
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@@ -94,7 +151,7 @@
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 	frame = (struct rt_sigframe __user *)regs->sp;
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-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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+	if (!access_ok(frame, sizeof(*frame)))
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 		goto badframe;
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 	if (restore_sigframe(regs, frame))
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@@ -106,7 +163,7 @@
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 	return regs->uregs[0];
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 badframe:
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-	force_sig(SIGSEGV, current);
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+	force_sig(SIGSEGV);
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 	return 0;
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 }
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@@ -152,6 +209,9 @@
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 	__put_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err);
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 	__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
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 	__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
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+#endif
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+#if IS_ENABLED(CONFIG_FPU)
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+	err |= setup_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
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 #endif
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 	__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no,
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@@ -215,7 +275,7 @@
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 	    get_sigframe(ksig, regs, sizeof(*frame));
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 	int err = 0;
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-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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+	if (!access_ok(frame, sizeof(*frame)))
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 		return -EFAULT;
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 	__put_user_error(0, &frame->uc.uc_flags, err);
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@@ -256,6 +316,7 @@
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 				regs->uregs[0] = -EINTR;
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 				break;
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 			}
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+			fallthrough;
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 		case -ERESTARTNOINTR:
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 			regs->uregs[0] = regs->orig_r0;
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 			regs->ipc -= 4;
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@@ -300,6 +361,7 @@
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 		switch (regs->uregs[0]) {
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 		case -ERESTART_RESTARTBLOCK:
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 			regs->uregs[15] = __NR_restart_syscall;
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+			fallthrough;
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 		case -ERESTARTNOHAND:
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 		case -ERESTARTSYS:
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 		case -ERESTARTNOINTR:
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@@ -314,11 +376,9 @@
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 asmlinkage void
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 do_notify_resume(struct pt_regs *regs, unsigned int thread_flags)
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 {
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-	if (thread_flags & _TIF_SIGPENDING)
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+	if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
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 		do_signal(regs);
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-	if (thread_flags & _TIF_NOTIFY_RESUME) {
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-		clear_thread_flag(TIF_NOTIFY_RESUME);
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+	if (thread_flags & _TIF_NOTIFY_RESUME)
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 		tracehook_notify_resume(regs);
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-	}
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 }