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author | 2015-05-11 02:36:51 +0900 | |
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committer | 2015-06-23 13:35:50 +0900 | |
commit | 883251dd163c551abcb1031803e20e3ccd1f988c (patch) | |
tree | af689584f4ee082cf973df93ca7b2ce216429c19 /arch/h8300/kernel | |
parent | h8300: UAPI headers (diff) | |
download | linux-883251dd163c551abcb1031803e20e3ccd1f988c.tar.gz linux-883251dd163c551abcb1031803e20e3ccd1f988c.tar.bz2 linux-883251dd163c551abcb1031803e20e3ccd1f988c.zip |
h8300: Interrupt and exceptions
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/kernel')
-rw-r--r-- | arch/h8300/kernel/irq.c | 97 | ||||
-rw-r--r-- | arch/h8300/kernel/signal.c | 289 | ||||
-rw-r--r-- | arch/h8300/kernel/traps.c | 161 |
3 files changed, 547 insertions, 0 deletions
diff --git a/arch/h8300/kernel/irq.c b/arch/h8300/kernel/irq.c new file mode 100644 index 000000000000..da79f9521699 --- /dev/null +++ b/arch/h8300/kernel/irq.c @@ -0,0 +1,97 @@ +/* + * linux/arch/h8300/kernel/irq.c + * + * Copyright 2014-2015 Yoshinori Sato <ysato@users.sourceforge.jp> + */ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/of_irq.h> +#include <asm/traps.h> + +#ifdef CONFIG_RAMKERNEL +typedef void (*h8300_vector)(void); + +static const h8300_vector __initconst trap_table[] = { + 0, 0, 0, 0, + _trace_break, + 0, 0, + _nmi, + _system_call, + 0, 0, + _trace_break, +}; + +static unsigned long __init *get_vector_address(void) +{ + unsigned long *rom_vector = CPU_VECTOR; + unsigned long base, tmp; + int vec_no; + + base = rom_vector[EXT_IRQ0] & ADDR_MASK; + + /* check romvector format */ + for (vec_no = EXT_IRQ0 + 1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) { + if ((base+(vec_no - EXT_IRQ0)*4) != + (rom_vector[vec_no] & ADDR_MASK)) + return NULL; + } + + /* ramvector base address */ + base -= EXT_IRQ0*4; + + /* writerble? */ + tmp = ~(*(volatile unsigned long *)base); + (*(volatile unsigned long *)base) = tmp; + if ((*(volatile unsigned long *)base) != tmp) + return NULL; + return (unsigned long *)base; +} + +static void __init setup_vector(void) +{ + int i; + unsigned long *ramvec, *ramvec_p; + const h8300_vector *trap_entry; + + ramvec = get_vector_address(); + if (ramvec == NULL) + panic("interrupt vector serup failed."); + else + pr_debug("virtual vector at 0x%p\n", ramvec); + + /* create redirect table */ + ramvec_p = ramvec; + trap_entry = trap_table; + for (i = 0; i < NR_IRQS; i++) { + if (i < 12) { + if (*trap_entry) + *ramvec_p = VECTOR(*trap_entry); + ramvec_p++; + trap_entry++; + } else + *ramvec_p++ = REDIRECT(_interrupt_entry); + } + _interrupt_redirect_table = ramvec; +} +#else +void setup_vector(void) +{ + /* noting do */ +} +#endif + +void __init init_IRQ(void) +{ + setup_vector(); + irqchip_init(); +} + +asmlinkage void do_IRQ(int irq) +{ + irq_enter(); + generic_handle_irq(irq); + irq_exit(); +} diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c new file mode 100644 index 000000000000..380fffd081b2 --- /dev/null +++ b/arch/h8300/kernel/signal.c @@ -0,0 +1,289 @@ +/* + * linux/arch/h8300/kernel/signal.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +/* + * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp> + * and David McCullough <davidm@snapgear.com> + * + * Based on + * Linux/m68k by Hamish Macdonald + */ + +/* + * ++roman (07/09/96): implemented signal stacks (specially for tosemu on + * Atari :-) Current limitation: Only one sigstack can be active at one time. + * If a second signal with SA_ONSTACK set arrives while working on a sigstack, + * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested + * signal handlers! + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/syscalls.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/highuid.h> +#include <linux/personality.h> +#include <linux/tty.h> +#include <linux/binfmts.h> +#include <linux/tracehook.h> + +#include <asm/setup.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> +#include <asm/traps.h> +#include <asm/ucontext.h> + +/* + * Do a signal return; undo the signal stack. + * + * Keep the return code on the stack quadword aligned! + * That makes the cache flush below easier. + */ + +struct rt_sigframe { + long dummy_er0; + long dummy_vector; +#if defined(CONFIG_CPU_H8S) + short dummy_exr; +#endif + long dummy_pc; + char *pretcode; + struct siginfo *pinfo; + void *puc; + unsigned char retcode[8]; + struct siginfo info; + struct ucontext uc; + int sig; +} __packed __aligned(2); + +static inline int +restore_sigcontext(struct sigcontext *usc, int *pd0) +{ + struct pt_regs *regs = current_pt_regs(); + int err = 0; + unsigned int ccr; + unsigned int usp; + unsigned int er0; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + /* restore passed registers */ +#define COPY(r) do { err |= get_user(regs->r, &usc->sc_##r); } while (0) + COPY(er1); + COPY(er2); + COPY(er3); + COPY(er5); + COPY(pc); + ccr = regs->ccr & 0x10; + COPY(ccr); +#undef COPY + regs->ccr &= 0xef; + regs->ccr |= ccr; + regs->orig_er0 = -1; /* disable syscall checks */ + err |= __get_user(usp, &usc->sc_usp); + wrusp(usp); + + err |= __get_user(er0, &usc->sc_er0); + *pd0 = er0; + return err; +} + +asmlinkage int sys_rt_sigreturn(void) +{ + unsigned long usp = rdusp(); + struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); + sigset_t set; + int er0; + + if (!access_ok(VERIFY_READ, 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(&frame->uc.uc_mcontext, &er0)) + goto badframe; + + if (restore_altstack(&frame->uc.uc_stack)) + goto badframe; + + return er0; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, + unsigned long mask) +{ + int err = 0; + + err |= __put_user(regs->er0, &sc->sc_er0); + err |= __put_user(regs->er1, &sc->sc_er1); + err |= __put_user(regs->er2, &sc->sc_er2); + err |= __put_user(regs->er3, &sc->sc_er3); + err |= __put_user(regs->er4, &sc->sc_er4); + err |= __put_user(regs->er5, &sc->sc_er5); + err |= __put_user(regs->er6, &sc->sc_er6); + err |= __put_user(rdusp(), &sc->sc_usp); + err |= __put_user(regs->pc, &sc->sc_pc); + err |= __put_user(regs->ccr, &sc->sc_ccr); + err |= __put_user(mask, &sc->sc_mask); + + return err; +} + +static inline void __user * +get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size) +{ + return (void __user *)((sigsp(rdusp(), ksig) - frame_size) & -8UL); +} + +static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, + struct pt_regs *regs) +{ + struct rt_sigframe *frame; + int err = 0; + unsigned char *ret; + + frame = get_sigframe(ksig, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + return -EFAULT; + + if (ksig->ka.sa.sa_flags & SA_SIGINFO) + err |= copy_siginfo_to_user(&frame->info, &ksig->info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(0, &frame->uc.uc_link); + err |= __save_altstack(&frame->uc.uc_stack, rdusp()); + err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); + err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + if (err) + return -EFAULT; + + /* Set up to return from userspace. */ + ret = frame->retcode; + if (ksig->ka.sa.sa_flags & SA_RESTORER) + ret = (unsigned char *)(ksig->ka.sa.sa_restorer); + else { + /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */ + err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff), + (unsigned long *)(frame->retcode + 0)); + err |= __put_user(0x5700, + (unsigned short *)(frame->retcode + 4)); + } + err |= __put_user(ret, &frame->pretcode); + + if (err) + return -EFAULT; + + /* Set up registers for signal handler */ + wrusp((unsigned long) frame); + regs->pc = (unsigned long) ksig->ka.sa.sa_handler; + regs->er0 = ksig->sig; + regs->er1 = (unsigned long)&(frame->info); + regs->er2 = (unsigned long)&frame->uc; + regs->er5 = current->mm->start_data; /* GOT base */ + + return 0; +} + +static void +handle_restart(struct pt_regs *regs, struct k_sigaction *ka) +{ + switch (regs->er0) { + case -ERESTARTNOHAND: + if (!ka) + goto do_restart; + regs->er0 = -EINTR; + break; + case -ERESTART_RESTARTBLOCK: + if (!ka) { + regs->er0 = __NR_restart_syscall; + regs->pc -= 2; + } else + regs->er0 = -EINTR; + break; + case -ERESTARTSYS: + if (!(ka->sa.sa_flags & SA_RESTART)) { + regs->er0 = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: +do_restart: + regs->er0 = regs->orig_er0; + regs->pc -= 2; + break; + } +} + +/* + * OK, we're invoking a handler + */ +static void +handle_signal(struct ksignal *ksig, struct pt_regs *regs) +{ + sigset_t *oldset = sigmask_to_save(); + int ret; + /* are we from a system call? */ + if (regs->orig_er0 >= 0) + handle_restart(regs, &ksig->ka); + + 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. + */ +static void do_signal(struct pt_regs *regs) +{ + struct ksignal ksig; + + current->thread.esp0 = (unsigned long) regs; + + if (get_signal(&ksig)) { + /* Whee! Actually deliver the signal. */ + handle_signal(&ksig, regs); + return; + } + /* Did we come from a system call? */ + if (regs->orig_er0 >= 0) + handle_restart(regs, NULL); + + /* If there's no signal to deliver, we just restore the saved mask. */ + restore_saved_sigmask(); +} + +asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) +{ + if (thread_info_flags & _TIF_SIGPENDING) + do_signal(regs); + + if (thread_info_flags & _TIF_NOTIFY_RESUME) { + clear_thread_flag(TIF_NOTIFY_RESUME); + tracehook_notify_resume(regs); + } +} diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c new file mode 100644 index 000000000000..1b2d7cdd6591 --- /dev/null +++ b/arch/h8300/kernel/traps.c @@ -0,0 +1,161 @@ +/* + * linux/arch/h8300/boot/traps.c -- general exception handling code + * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp> + * + * Cloned from Linux/m68k. + * + * No original Copyright holder listed, + * Probable original (C) Roman Zippel (assigned DJD, 1999) + * + * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/bug.h> + +#include <asm/irq.h> +#include <asm/traps.h> +#include <asm/page.h> + +static DEFINE_SPINLOCK(die_lock); + +/* + * this must be called very early as the kernel might + * use some instruction that are emulated on the 060 + */ + +void __init base_trap_init(void) +{ +} + +void __init trap_init(void) +{ +} + +asmlinkage void set_esp0(unsigned long ssp) +{ + current->thread.esp0 = ssp; +} + +/* + * Generic dumping code. Used for panic and debug. + */ + +static void dump(struct pt_regs *fp) +{ + unsigned long *sp; + unsigned char *tp; + int i; + + pr_info("\nCURRENT PROCESS:\n\n"); + pr_info("COMM=%s PID=%d\n", current->comm, current->pid); + if (current->mm) { + pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n", + (int) current->mm->start_code, + (int) current->mm->end_code, + (int) current->mm->start_data, + (int) current->mm->end_data, + (int) current->mm->end_data, + (int) current->mm->brk); + pr_info("USER-STACK=%08x KERNEL-STACK=%08lx\n\n", + (int) current->mm->start_stack, + (int) PAGE_SIZE+(unsigned long)current); + } + + show_regs(fp); + pr_info("\nCODE:"); + tp = ((unsigned char *) fp->pc) - 0x20; + for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { + if ((i % 0x10) == 0) + pr_info("\n%08x: ", (int) (tp + i)); + pr_info("%08x ", (int) *sp++); + } + pr_info("\n"); + + pr_info("\nKERNEL STACK:"); + tp = ((unsigned char *) fp) - 0x40; + for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { + if ((i % 0x10) == 0) + pr_info("\n%08x: ", (int) (tp + i)); + pr_info("%08x ", (int) *sp++); + } + pr_info("\n"); + if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE)) + pr_info("(Possibly corrupted stack page??)\n"); + + pr_info("\n\n"); +} + +void die(const char *str, struct pt_regs *fp, unsigned long err) +{ + static int diecount; + + oops_enter(); + + console_verbose(); + spin_lock_irq(&die_lock); + report_bug(fp->pc, fp); + pr_crit("%s: %04lx [#%d] ", str, err & 0xffff, ++diecount); + dump(fp); + + spin_unlock_irq(&die_lock); + do_exit(SIGSEGV); +} + +static int kstack_depth_to_print = 24; + +void show_stack(struct task_struct *task, unsigned long *esp) +{ + unsigned long *stack, addr; + int i; + + if (esp == NULL) + esp = (unsigned long *) &esp; + + stack = esp; + + pr_info("Stack from %08lx:", (unsigned long)stack); + for (i = 0; i < kstack_depth_to_print; i++) { + if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0) + break; + if (i % 8 == 0) + pr_info("\n "); + pr_info(" %08lx", *stack++); + } + + pr_info("\nCall Trace:"); + i = 0; + stack = esp; + while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) { + addr = *stack++; + /* + * If the address is either in the text segment of the + * kernel, or in the region which contains vmalloc'ed + * memory, it *may* be the address of a calling + * routine; if so, print it so that someone tracing + * down the cause of the crash will be able to figure + * out the call path that was taken. + */ + if (check_kernel_text(addr)) { + if (i % 4 == 0) + pr_info("\n "); + pr_info(" [<%08lx>]", addr); + i++; + } + } + pr_info("\n"); +} + +void show_trace_task(struct task_struct *tsk) +{ + show_stack(tsk, (unsigned long *)tsk->thread.esp0); +} |