Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Linus Torvalds (pre-git) | 1653 | 59.59% | 7 | 12.28% |
Paul Mundt | 522 | 18.82% | 23 | 40.35% |
Andrew Morton | 341 | 12.29% | 2 | 3.51% |
Richard Weinberger | 94 | 3.39% | 2 | 3.51% |
Al Viro | 47 | 1.69% | 5 | 8.77% |
Stuart Menefy | 32 | 1.15% | 2 | 3.51% |
Yoshinori Sato | 18 | 0.65% | 1 | 1.75% |
Kaz Kojima | 12 | 0.43% | 1 | 1.75% |
Matt Fleming | 10 | 0.36% | 2 | 3.51% |
Carl Shaw | 9 | 0.32% | 1 | 1.75% |
Andrea Arcangeli | 7 | 0.25% | 1 | 1.75% |
Bobby Bingham | 6 | 0.22% | 1 | 1.75% |
Alexey Dobriyan | 6 | 0.22% | 1 | 1.75% |
Linus Torvalds | 6 | 0.22% | 3 | 5.26% |
Jesper Juhl | 4 | 0.14% | 1 | 1.75% |
Ingo Molnar | 3 | 0.11% | 1 | 1.75% |
Andrew Lutomirski | 2 | 0.07% | 1 | 1.75% |
Ryusuke Sakato | 1 | 0.04% | 1 | 1.75% |
Greg Kroah-Hartman | 1 | 0.04% | 1 | 1.75% |
Total | 2774 | 57 |
// SPDX-License-Identifier: GPL-2.0 /* * linux/arch/sh/kernel/signal.c * * Copyright (C) 1991, 1992 Linus Torvalds * * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson * * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima * */ #include <linux/sched.h> #include <linux/sched/task_stack.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/kernel.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/wait.h> #include <linux/ptrace.h> #include <linux/unistd.h> #include <linux/stddef.h> #include <linux/tty.h> #include <linux/elf.h> #include <linux/personality.h> #include <linux/binfmts.h> #include <linux/io.h> #include <linux/tracehook.h> #include <asm/ucontext.h> #include <linux/uaccess.h> #include <asm/pgtable.h> #include <asm/cacheflush.h> #include <asm/syscalls.h> #include <asm/fpu.h> struct fdpic_func_descriptor { unsigned long text; unsigned long GOT; }; /* * The following define adds a 64 byte gap between the signal * stack frame and previous contents of the stack. This allows * frame unwinding in a function epilogue but only if a frame * pointer is used in the function. This is necessary because * current gcc compilers (<4.3) do not generate unwind info on * SH for function epilogues. */ #define UNWINDGUARD 64 /* * Do a signal return; undo the signal stack. */ #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ #if defined(CONFIG_CPU_SH2) #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ #else #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ #endif #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ struct sigframe { struct sigcontext sc; unsigned long extramask[_NSIG_WORDS-1]; u16 retcode[8]; }; struct rt_sigframe { struct siginfo info; struct ucontext uc; u16 retcode[8]; }; #ifdef CONFIG_SH_FPU static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) { struct task_struct *tsk = current; if (!(boot_cpu_data.flags & CPU_HAS_FPU)) return 0; set_used_math(); return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0], sizeof(long)*(16*2+2)); } static inline int save_sigcontext_fpu(struct sigcontext __user *sc, struct pt_regs *regs) { struct task_struct *tsk = current; if (!(boot_cpu_data.flags & CPU_HAS_FPU)) return 0; if (!used_math()) return __put_user(0, &sc->sc_ownedfp); if (__put_user(1, &sc->sc_ownedfp)) return -EFAULT; /* This will cause a "finit" to be triggered by the next attempted FPU operation by the 'current' process. */ clear_used_math(); unlazy_fpu(tsk, regs); return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu, sizeof(long)*(16*2+2)); } #endif /* CONFIG_SH_FPU */ static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) { unsigned int err = 0; #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); COPY(gbr); COPY(mach); COPY(macl); COPY(pr); COPY(sr); COPY(pc); #undef COPY #ifdef CONFIG_SH_FPU if (boot_cpu_data.flags & CPU_HAS_FPU) { int owned_fp; struct task_struct *tsk = current; regs->sr |= SR_FD; /* Release FPU */ clear_fpu(tsk, regs); clear_used_math(); err |= __get_user (owned_fp, &sc->sc_ownedfp); if (owned_fp) err |= restore_sigcontext_fpu(sc); } #endif regs->tra = -1; /* disable syscall checks */ err |= __get_user(*r0_p, &sc->sc_regs[0]); return err; } asmlinkage int sys_sigreturn(void) { struct pt_regs *regs = current_pt_regs(); struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; sigset_t set; int r0; /* Always make any pending restarted system calls return -EINTR */ current->restart_block.fn = do_no_restart_syscall; if (!access_ok(frame, sizeof(*frame))) goto badframe; if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 && __copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask)))) goto badframe; set_current_blocked(&set); if (restore_sigcontext(regs, &frame->sc, &r0)) goto badframe; return r0; badframe: force_sig(SIGSEGV); return 0; } asmlinkage int sys_rt_sigreturn(void) { struct pt_regs *regs = current_pt_regs(); struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; sigset_t set; int r0; /* Always make any pending restarted system calls return -EINTR */ current->restart_block.fn = do_no_restart_syscall; if (!access_ok(frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) goto badframe; set_current_blocked(&set); if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) goto badframe; if (restore_altstack(&frame->uc.uc_stack)) goto badframe; return r0; badframe: force_sig(SIGSEGV); return 0; } /* * Set up a signal frame. */ static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask) { int err = 0; #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); COPY(gbr); COPY(mach); COPY(macl); COPY(pr); COPY(sr); COPY(pc); #undef COPY #ifdef CONFIG_SH_FPU err |= save_sigcontext_fpu(sc, regs); #endif /* non-iBCS2 extensions.. */ err |= __put_user(mask, &sc->oldmask); return err; } /* * Determine which stack to use.. */ static inline void __user * get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) { if (ka->sa.sa_flags & SA_ONSTACK) { if (sas_ss_flags(sp) == 0) sp = current->sas_ss_sp + current->sas_ss_size; } return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul); } /* These symbols are defined with the addresses in the vsyscall page. See vsyscall-trapa.S. */ extern void __kernel_sigreturn(void); extern void __kernel_rt_sigreturn(void); static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { struct sigframe __user *frame; int err = 0, sig = ksig->sig; frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame)); if (!access_ok(frame, sizeof(*frame))) return -EFAULT; err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); if (_NSIG_WORDS > 1) err |= __copy_to_user(frame->extramask, &set->sig[1], sizeof(frame->extramask)); /* Set up to return from userspace. If provided, use a stub already in userspace. */ if (ksig->ka.sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ksig->ka.sa.sa_restorer; #ifdef CONFIG_VSYSCALL } else if (likely(current->mm->context.vdso)) { regs->pr = VDSO_SYM(&__kernel_sigreturn); #endif } else { /* Generate return code (system call to sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); err |= __put_user(TRAP_NOARG, &frame->retcode[1]); err |= __put_user(OR_R0_R0, &frame->retcode[2]); err |= __put_user(OR_R0_R0, &frame->retcode[3]); err |= __put_user(OR_R0_R0, &frame->retcode[4]); err |= __put_user(OR_R0_R0, &frame->retcode[5]); err |= __put_user(OR_R0_R0, &frame->retcode[6]); err |= __put_user((__NR_sigreturn), &frame->retcode[7]); regs->pr = (unsigned long) frame->retcode; flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); } if (err) return -EFAULT; /* Set up registers for signal handler */ regs->regs[15] = (unsigned long) frame; regs->regs[4] = sig; /* Arg for signal handler */ regs->regs[5] = 0; regs->regs[6] = (unsigned long) &frame->sc; if (current->personality & FDPIC_FUNCPTRS) { struct fdpic_func_descriptor __user *funcptr = (struct fdpic_func_descriptor __user *)ksig->ka.sa.sa_handler; err |= __get_user(regs->pc, &funcptr->text); err |= __get_user(regs->regs[12], &funcptr->GOT); } else regs->pc = (unsigned long)ksig->ka.sa.sa_handler; if (err) return -EFAULT; pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); return 0; } static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { struct rt_sigframe __user *frame; int err = 0, sig = ksig->sig; frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame)); if (!access_ok(frame, sizeof(*frame))) return -EFAULT; err |= copy_siginfo_to_user(&frame->info, &ksig->info); /* Create the ucontext. */ err |= __put_user(0, &frame->uc.uc_flags); err |= __put_user(NULL, &frame->uc.uc_link); err |= __save_altstack(&frame->uc.uc_stack, regs->regs[15]); err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); /* Set up to return from userspace. If provided, use a stub already in userspace. */ if (ksig->ka.sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ksig->ka.sa.sa_restorer; #ifdef CONFIG_VSYSCALL } else if (likely(current->mm->context.vdso)) { regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); #endif } else { /* Generate return code (system call to rt_sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); err |= __put_user(TRAP_NOARG, &frame->retcode[1]); err |= __put_user(OR_R0_R0, &frame->retcode[2]); err |= __put_user(OR_R0_R0, &frame->retcode[3]); err |= __put_user(OR_R0_R0, &frame->retcode[4]); err |= __put_user(OR_R0_R0, &frame->retcode[5]); err |= __put_user(OR_R0_R0, &frame->retcode[6]); err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); regs->pr = (unsigned long) frame->retcode; flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); } if (err) return -EFAULT; /* Set up registers for signal handler */ regs->regs[15] = (unsigned long) frame; regs->regs[4] = sig; /* Arg for signal handler */ regs->regs[5] = (unsigned long) &frame->info; regs->regs[6] = (unsigned long) &frame->uc; if (current->personality & FDPIC_FUNCPTRS) { struct fdpic_func_descriptor __user *funcptr = (struct fdpic_func_descriptor __user *)ksig->ka.sa.sa_handler; err |= __get_user(regs->pc, &funcptr->text); err |= __get_user(regs->regs[12], &funcptr->GOT); } else regs->pc = (unsigned long)ksig->ka.sa.sa_handler; if (err) return -EFAULT; pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); return 0; } static inline void handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs, struct sigaction *sa) { /* If we're not from a syscall, bail out */ if (regs->tra < 0) return; /* check for system call restart.. */ switch (regs->regs[0]) { case -ERESTART_RESTARTBLOCK: case -ERESTARTNOHAND: no_system_call_restart: regs->regs[0] = -EINTR; break; case -ERESTARTSYS: if (!(sa->sa_flags & SA_RESTART)) goto no_system_call_restart; /* fallthrough */ case -ERESTARTNOINTR: regs->regs[0] = save_r0; regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); break; } } /* * OK, we're invoking a handler */ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs, unsigned int save_r0) { sigset_t *oldset = sigmask_to_save(); int ret; /* Set up the stack frame */ if (ksig->ka.sa.sa_flags & SA_SIGINFO) ret = setup_rt_frame(ksig, oldset, regs); else ret = setup_frame(ksig, oldset, regs); signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); } /* * 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, unsigned int save_r0) { struct ksignal ksig; /* * We want the common case to go fast, which * is why we may in certain cases get here from * kernel mode. Just return without doing anything * if so. */ if (!user_mode(regs)) return; if (get_signal(&ksig)) { handle_syscall_restart(save_r0, regs, &ksig.ka.sa); /* Whee! Actually deliver the signal. */ handle_signal(&ksig, regs, save_r0); return; } /* Did we come from a system call? */ if (regs->tra >= 0) { /* Restart the system call - no handlers present */ if (regs->regs[0] == -ERESTARTNOHAND || regs->regs[0] == -ERESTARTSYS || regs->regs[0] == -ERESTARTNOINTR) { regs->regs[0] = save_r0; regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); regs->regs[3] = __NR_restart_syscall; } } /* * If there's no signal to deliver, we just put the saved sigmask * back. */ restore_saved_sigmask(); } asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, unsigned long thread_info_flags) { /* deal with pending signal delivery */ if (thread_info_flags & _TIF_SIGPENDING) do_signal(regs, save_r0); if (thread_info_flags & _TIF_NOTIFY_RESUME) { clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); } }
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