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    Subject[PATCH v12 08/21] h8300: Interrupt and exceptions
    Date
    Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
    ---
    arch/h8300/kernel/irq.c | 97 +++++++++++++++
    arch/h8300/kernel/signal.c | 289 +++++++++++++++++++++++++++++++++++++++++++++
    arch/h8300/kernel/traps.c | 161 +++++++++++++++++++++++++
    3 files changed, 547 insertions(+)
    create mode 100644 arch/h8300/kernel/irq.c
    create mode 100644 arch/h8300/kernel/signal.c
    create mode 100644 arch/h8300/kernel/traps.c

    diff --git a/arch/h8300/kernel/irq.c b/arch/h8300/kernel/irq.c
    new file mode 100644
    index 0000000..da79f95
    --- /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 0000000..380fffd
    --- /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 0000000..1b2d7cd
    --- /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);
    +}
    --
    2.1.4


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