diff options
Diffstat (limited to 'arch/openrisc/kernel/signal.c')
| -rw-r--r-- | arch/openrisc/kernel/signal.c | 70 |
1 files changed, 54 insertions, 16 deletions
diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 4f0754874d78..f70a13ee0593 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -21,21 +21,56 @@ #include <linux/ptrace.h> #include <linux/unistd.h> #include <linux/stddef.h> -#include <linux/tracehook.h> +#include <linux/resume_user_mode.h> +#include <asm/fpu.h> #include <asm/processor.h> #include <asm/syscall.h> #include <asm/ucontext.h> #include <linux/uaccess.h> -#define DEBUG_SIG 0 - struct rt_sigframe { struct siginfo info; struct ucontext uc; unsigned char retcode[16]; /* trampoline code */ }; +asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs); + +asmlinkage int do_work_pending(struct pt_regs *regs, unsigned int thread_flags, + int syscall); + +#ifdef CONFIG_FPU +static long restore_fp_state(struct sigcontext __user *sc) +{ + long err; + + err = __copy_from_user(¤t->thread.fpcsr, &sc->fpcsr, sizeof(unsigned long)); + if (unlikely(err)) + return err; + + /* Restore the FPU state */ + restore_fpu(current); + + return 0; +} + +static long save_fp_state(struct sigcontext __user *sc) +{ + long err; + + /* Sync the user FPU state so we can copy to sigcontext */ + save_fpu(current); + + err = __copy_to_user(&sc->fpcsr, ¤t->thread.fpcsr, sizeof(unsigned long)); + + return err; +} +#else +#define save_fp_state(sc) (0) +#define restore_fp_state(sc) (0) +#endif + static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) { @@ -52,6 +87,7 @@ static int restore_sigcontext(struct pt_regs *regs, err |= __copy_from_user(regs, sc->regs.gpr, 32 * sizeof(unsigned long)); err |= __copy_from_user(®s->pc, &sc->regs.pc, sizeof(unsigned long)); err |= __copy_from_user(®s->sr, &sc->regs.sr, sizeof(unsigned long)); + err |= restore_fp_state(sc); /* make sure the SM-bit is cleared so user-mode cannot fool us */ regs->sr &= ~SPR_SR_SM; @@ -68,7 +104,7 @@ static int restore_sigcontext(struct pt_regs *regs, asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs) { - struct rt_sigframe *frame = (struct rt_sigframe __user *)regs->sp; + struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->sp; sigset_t set; /* @@ -76,7 +112,7 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs) * then frame should be dword aligned here. If it's * not, then the user is trying to mess with us. */ - if (((long)frame) & 3) + if (((unsigned long)frame) & 3) goto badframe; if (!access_ok(frame, sizeof(*frame))) @@ -114,6 +150,7 @@ static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) err |= __copy_to_user(sc->regs.gpr, regs, 32 * sizeof(unsigned long)); err |= __copy_to_user(&sc->regs.pc, ®s->pc, sizeof(unsigned long)); err |= __copy_to_user(&sc->regs.sr, ®s->sr, sizeof(unsigned long)); + err |= save_fp_state(sc); return err; } @@ -151,7 +188,7 @@ static inline void __user *get_sigframe(struct ksignal *ksig, static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { - struct rt_sigframe *frame; + struct rt_sigframe __user *frame; unsigned long return_ip; int err = 0; @@ -181,10 +218,10 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, l.ori r11,r0,__NR_sigreturn l.sys 1 */ - err |= __put_user(0xa960, (short *)(frame->retcode + 0)); - err |= __put_user(__NR_rt_sigreturn, (short *)(frame->retcode + 2)); - err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4)); - err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8)); + err |= __put_user(0xa960, (short __user *)(frame->retcode + 0)); + err |= __put_user(__NR_rt_sigreturn, (short __user *)(frame->retcode + 2)); + err |= __put_user(0x20000001, (unsigned long __user *)(frame->retcode + 4)); + err |= __put_user(0x15000000, (unsigned long __user *)(frame->retcode + 8)); if (err) return -EFAULT; @@ -207,6 +244,8 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs) { int ret; + rseq_signal_deliver(ksig, regs); + ret = setup_rt_frame(ksig, sigmask_to_save(), regs); signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); @@ -224,7 +263,7 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs) * mode below. */ -int do_signal(struct pt_regs *regs, int syscall) +static int do_signal(struct pt_regs *regs, int syscall) { struct ksignal ksig; unsigned long continue_addr = 0; @@ -244,7 +283,7 @@ int do_signal(struct pt_regs *regs, int syscall) switch (retval) { case -ERESTART_RESTARTBLOCK: restart = -2; - /* Fall through */ + fallthrough; case -ERESTARTNOHAND: case -ERESTARTSYS: case -ERESTARTNOINTR: @@ -299,7 +338,7 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) if (unlikely(!user_mode(regs))) return 0; local_irq_enable(); - if (thread_flags & _TIF_SIGPENDING) { + if (thread_flags & (_TIF_SIGPENDING|_TIF_NOTIFY_SIGNAL)) { int restart = do_signal(regs, syscall); if (unlikely(restart)) { /* @@ -311,12 +350,11 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) } syscall = 0; } else { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(regs); + resume_user_mode_work(regs); } } local_irq_disable(); - thread_flags = current_thread_info()->flags; + thread_flags = read_thread_flags(); } while (thread_flags & _TIF_WORK_MASK); return 0; } |