diff options
Diffstat (limited to 'arch/nds32/kernel/signal.c')
| -rw-r--r-- | arch/nds32/kernel/signal.c | 384 |
1 files changed, 0 insertions, 384 deletions
diff --git a/arch/nds32/kernel/signal.c b/arch/nds32/kernel/signal.c deleted file mode 100644 index 7e3ca430a223..000000000000 --- a/arch/nds32/kernel/signal.c +++ /dev/null @@ -1,384 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 2005-2017 Andes Technology Corporation - -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/ptrace.h> -#include <linux/personality.h> -#include <linux/freezer.h> -#include <linux/tracehook.h> -#include <linux/uaccess.h> - -#include <asm/cacheflush.h> -#include <asm/ucontext.h> -#include <asm/unistd.h> -#include <asm/fpu.h> - -#include <asm/ptrace.h> -#include <asm/vdso.h> - -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) -{ - sigset_t set; - int err; - - err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); - if (err == 0) { - set_current_blocked(&set); - } - - __get_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err); - __get_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err); - __get_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err); - __get_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err); - __get_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err); - __get_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err); - __get_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err); - __get_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err); - __get_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err); - __get_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err); - __get_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err); - __get_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err); - __get_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err); - __get_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err); - __get_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err); - __get_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err); - __get_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err); - __get_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err); - __get_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err); - __get_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err); - __get_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err); - __get_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err); - __get_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err); - __get_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err); - __get_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err); - __get_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err); - - __get_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err); - __get_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err); - __get_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err); - __get_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err); - __get_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err); -#if defined(CONFIG_HWZOL) - __get_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err); - __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. - */ - forget_syscall(regs); - return err; -} - -asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) -{ - struct rt_sigframe __user *frame; - - /* Always make any pending restarted system calls return -EINTR */ - current->restart_block.fn = do_no_restart_syscall; - - /* - * Since we stacked the signal on a 64-bit boundary, - * then 'sp' should be two-word aligned here. If it's - * not, then the user is trying to mess with us. - */ - if (regs->sp & 7) - goto badframe; - - frame = (struct rt_sigframe __user *)regs->sp; - - if (!access_ok(frame, sizeof(*frame))) - goto badframe; - - if (restore_sigframe(regs, frame)) - goto badframe; - - if (restore_altstack(&frame->uc.uc_stack)) - goto badframe; - - return regs->uregs[0]; - -badframe: - force_sig(SIGSEGV); - return 0; -} - -static int -setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs, - sigset_t * set) -{ - int err = 0; - - __put_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err); - __put_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err); - __put_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err); - __put_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err); - __put_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err); - __put_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err); - __put_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err); - __put_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err); - __put_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err); - __put_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err); - __put_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err); - __put_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err); - __put_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err); - __put_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err); - __put_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err); - __put_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err); - __put_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err); - __put_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err); - __put_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err); - __put_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err); - __put_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err); - - __put_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err); - __put_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err); - __put_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err); - __put_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err); - __put_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err); - __put_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err); - __put_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err); - __put_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err); - __put_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err); - __put_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err); -#if defined(CONFIG_HWZOL) - __put_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err); - __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); - __put_user_error(current->thread.error_code, - &sf->uc.uc_mcontext.error_code, err); - __put_user_error(current->thread.address, - &sf->uc.uc_mcontext.fault_address, err); - __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); - - err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); - - return err; -} - -static inline void __user *get_sigframe(struct ksignal *ksig, - struct pt_regs *regs, int framesize) -{ - unsigned long sp; - - /* Default to using normal stack */ - sp = regs->sp; - - /* - * If we are on the alternate signal stack and would overflow it, don't. - * Return an always-bogus address instead so we will die with SIGSEGV. - */ - if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) - return (void __user __force *)(-1UL); - - /* This is the X/Open sanctioned signal stack switching. */ - sp = (sigsp(sp, ksig) - framesize); - - /* - * nds32 mandates 8-byte alignment - */ - sp &= ~0x7UL; - - return (void __user *)sp; -} - -static int -setup_return(struct pt_regs *regs, struct ksignal *ksig, void __user * frame) -{ - unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler; - unsigned long retcode; - - retcode = VDSO_SYMBOL(current->mm->context.vdso, rt_sigtramp); - regs->uregs[0] = ksig->sig; - regs->sp = (unsigned long)frame; - regs->lp = retcode; - regs->ipc = handler; - - return 0; -} - -static int -setup_rt_frame(struct ksignal *ksig, sigset_t * set, struct pt_regs *regs) -{ - struct rt_sigframe __user *frame = - get_sigframe(ksig, regs, sizeof(*frame)); - int err = 0; - - if (!access_ok(frame, sizeof(*frame))) - return -EFAULT; - - __put_user_error(0, &frame->uc.uc_flags, err); - __put_user_error(NULL, &frame->uc.uc_link, err); - - err |= __save_altstack(&frame->uc.uc_stack, regs->sp); - err |= setup_sigframe(frame, regs, set); - if (err == 0) { - setup_return(regs, ksig, frame); - if (ksig->ka.sa.sa_flags & SA_SIGINFO) { - err |= copy_siginfo_to_user(&frame->info, &ksig->info); - regs->uregs[1] = (unsigned long)&frame->info; - regs->uregs[2] = (unsigned long)&frame->uc; - } - } - return err; -} - -/* - * OK, we're invoking a handler - */ -static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) -{ - int ret; - sigset_t *oldset = sigmask_to_save(); - - if (in_syscall(regs)) { - /* Avoid additional syscall restarting via ret_slow_syscall. */ - forget_syscall(regs); - - switch (regs->uregs[0]) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - regs->uregs[0] = -EINTR; - break; - case -ERESTARTSYS: - if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { - regs->uregs[0] = -EINTR; - break; - } - fallthrough; - case -ERESTARTNOINTR: - regs->uregs[0] = regs->orig_r0; - regs->ipc -= 4; - break; - } - } - /* - * Set up the stack frame - */ - ret = setup_rt_frame(ksig, oldset, regs); - - signal_setup_done(ret, ksig, 0); -} - -/* - * Note that 'init' is a special process: it doesn't get signals it doesn't - * want to handle. Thus you cannot kill init even with a SIGKILL even by - * mistake. - * - * Note that we go through the signals twice: once to check the signals that - * the kernel can handle, and then we build all the user-level signal handling - * stack-frames in one go after that. - */ -static void do_signal(struct pt_regs *regs) -{ - struct ksignal ksig; - - if (get_signal(&ksig)) { - handle_signal(&ksig, regs); - return; - } - - /* - * If we were from a system call, check for system call restarting... - */ - if (in_syscall(regs)) { - /* Restart the system call - no handlers present */ - - /* Avoid additional syscall restarting via ret_slow_syscall. */ - forget_syscall(regs); - - switch (regs->uregs[0]) { - case -ERESTART_RESTARTBLOCK: - regs->uregs[15] = __NR_restart_syscall; - fallthrough; - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - regs->uregs[0] = regs->orig_r0; - regs->ipc -= 0x4; - break; - } - } - restore_saved_sigmask(); -} - -asmlinkage void -do_notify_resume(struct pt_regs *regs, unsigned int thread_flags) -{ - if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) - do_signal(regs); - - if (thread_flags & _TIF_NOTIFY_RESUME) - tracehook_notify_resume(regs); -} |