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Diffstat (limited to 'arch/nds32/kernel/signal.c')
-rw-r--r--arch/nds32/kernel/signal.c62
1 files changed, 61 insertions, 1 deletions
diff --git a/arch/nds32/kernel/signal.c b/arch/nds32/kernel/signal.c
index 5d01f6e33cb8..5b5be082cfa4 100644
--- a/arch/nds32/kernel/signal.c
+++ b/arch/nds32/kernel/signal.c
@@ -12,6 +12,7 @@
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
#include <asm/unistd.h>
+#include <asm/fpu.h>
#include <asm/ptrace.h>
#include <asm/vdso.h>
@@ -20,6 +21,60 @@ struct rt_sigframe {
struct siginfo info;
struct ucontext uc;
};
+#if IS_ENABLED(CONFIG_FPU)
+static inline int restore_sigcontext_fpu(struct pt_regs *regs,
+ struct sigcontext __user *sc)
+{
+ struct task_struct *tsk = current;
+ unsigned long used_math_flag;
+ int ret = 0;
+
+ clear_used_math();
+ __get_user_error(used_math_flag, &sc->used_math_flag, ret);
+
+ if (!used_math_flag)
+ return 0;
+ set_used_math();
+
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+ preempt_disable();
+ if (current == last_task_used_math) {
+ last_task_used_math = NULL;
+ disable_ptreg_fpu(regs);
+ }
+ preempt_enable();
+#else
+ clear_fpu(regs);
+#endif
+
+ return __copy_from_user(&tsk->thread.fpu, &sc->fpu,
+ sizeof(struct fpu_struct));
+}
+
+static inline int setup_sigcontext_fpu(struct pt_regs *regs,
+ struct sigcontext __user *sc)
+{
+ struct task_struct *tsk = current;
+ int ret = 0;
+
+ __put_user_error(used_math(), &sc->used_math_flag, ret);
+
+ if (!used_math())
+ return ret;
+
+ preempt_disable();
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+ if (last_task_used_math == tsk)
+ save_fpu(last_task_used_math);
+#else
+ unlazy_fpu(tsk);
+#endif
+ ret = __copy_to_user(&sc->fpu, &tsk->thread.fpu,
+ sizeof(struct fpu_struct));
+ preempt_enable();
+ return ret;
+}
+#endif
static int restore_sigframe(struct pt_regs *regs,
struct rt_sigframe __user * sf)
@@ -69,7 +124,9 @@ static int restore_sigframe(struct pt_regs *regs,
__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
#endif
-
+#if IS_ENABLED(CONFIG_FPU)
+ err |= restore_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
+#endif
/*
* Avoid sys_rt_sigreturn() restarting.
*/
@@ -153,6 +210,9 @@ setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs,
__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
#endif
+#if IS_ENABLED(CONFIG_FPU)
+ err |= setup_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
+#endif
__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no,
err);