Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* $Id: traps.c,v 1.64 2000/09/03 15:00:49 anton Exp $

 * arch/sparc/kernel/traps.c

 *

 * Copyright 1995 David S. Miller (davem@caip.rutgers.edu)

 * Copyright 2000 Jakub Jelinek (jakub@redhat.com)

 */

/*

 * I hate traps on the sparc, grrr...

 */

#include <linux/sched.h>  /* for jiffies */

#include <linux/kernel.h>

#include <linux/kallsyms.h>

#include <linux/signal.h>

#include <linux/smp.h>

#include <linux/smp_lock.h>

#include <linux/kdebug.h>

#include <asm/delay.h>

#include <asm/system.h>

#include <asm/ptrace.h>

#include <asm/oplib.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/unistd.h>

#include <asm/traps.h>

/* #define TRAP_DEBUG */

struct trap_trace_entry {

        unsigned long pc;

        unsigned long type;

};

int trap_curbuf = 0;

struct trap_trace_entry trapbuf[1024];

void syscall_trace_entry(struct pt_regs *regs)

{

        printk("%s[%d]: ", current->comm, task_pid_nr(current));

        printk("scall<%d> (could be %d)\n", (int) regs->u_regs[UREG_G1],

               (int) regs->u_regs[UREG_I0]);

}

void syscall_trace_exit(struct pt_regs *regs)

{

}

void sun4m_nmi(struct pt_regs *regs)

{

        unsigned long afsr, afar;

        printk("Aieee: sun4m NMI received!\n");

        /* XXX HyperSparc hack XXX */

        __asm__ __volatile__("mov 0x500, %%g1\n\t"

                             "lda [%%g1] 0x4, %0\n\t"

                             "mov 0x600, %%g1\n\t"

                             "lda [%%g1] 0x4, %1\n\t" :

                             "=r" (afsr), "=r" (afar));

        printk("afsr=%08lx afar=%08lx\n", afsr, afar);

        printk("you lose buddy boy...\n");

        show_regs(regs);

        prom_halt();

}

void sun4d_nmi(struct pt_regs *regs)

{

        printk("Aieee: sun4d NMI received!\n");

        printk("you lose buddy boy...\n");

        show_regs(regs);

        prom_halt();

}

void instruction_dump (unsigned long *pc)

{

        int i;

        if((((unsigned long) pc) & 3))

                return;

        for(i = -3; i < 6; i++)

                printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');

        printk("\n");

}

#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")

#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")

void die_if_kernel(char *str, struct pt_regs *regs)

{

        static int die_counter;

        int count = 0;

        /* Amuse the user. */

        printk(

"              \\|/ ____ \\|/\n"

"              \"@'/ ,. \\`@\"\n"

"              /_| \\__/ |_\\\n"

"                 \\__U_/\n");

        printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);

        show_regs(regs);

        add_taint(TAINT_DIE);

        __SAVE; __SAVE; __SAVE; __SAVE;

        __SAVE; __SAVE; __SAVE; __SAVE;

        __RESTORE; __RESTORE; __RESTORE; __RESTORE;

        __RESTORE; __RESTORE; __RESTORE; __RESTORE;

        {

                struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];

                /* Stop the back trace when we hit userland or we

                 * find some badly aligned kernel stack. Set an upper

                 * bound in case our stack is trashed and we loop.

                 */

                while(rw                                        &&

                      count++ < 30                              &&

                      (((unsigned long) rw) >= PAGE_OFFSET)     &&

                      !(((unsigned long) rw) & 0x7)) {

                        printk("Caller[%08lx]", rw->ins[7]);

                        print_symbol(": %s\n", rw->ins[7]);

                        rw = (struct reg_window *)rw->ins[6];

                }

        }

        printk("Instruction DUMP:");

        instruction_dump ((unsigned long *) regs->pc);

        if(regs->psr & PSR_PS)

                do_exit(SIGKILL);

        do_exit(SIGSEGV);

}

void do_hw_interrupt(struct pt_regs *regs, unsigned long type)

{

        siginfo_t info;

        if(type < 0x80) {

                /* Sun OS's puke from bad traps, Linux survives! */

                printk("Unimplemented Sparc TRAP, type = %02lx\n", type);

                die_if_kernel("Whee... Hello Mr. Penguin", regs);

        }

        if(regs->psr & PSR_PS)

                die_if_kernel("Kernel bad trap", regs);

        info.si_signo = SIGILL;

        info.si_errno = 0;

        info.si_code = ILL_ILLTRP;

        info.si_addr = (void __user *)regs->pc;

        info.si_trapno = type - 0x80;

        force_sig_info(SIGILL, &info, current);

}

void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                            unsigned long psr)

{

        extern int do_user_muldiv (struct pt_regs *, unsigned long);

        siginfo_t info;

        if(psr & PSR_PS)

                die_if_kernel("Kernel illegal instruction", regs);

#ifdef TRAP_DEBUG

        printk("Ill instr. at pc=%08lx instruction is %08lx\n",

               regs->pc, *(unsigned long *)regs->pc);

#endif

        if (!do_user_muldiv (regs, pc))

                return;

        info.si_signo = SIGILL;

        info.si_errno = 0;

        info.si_code = ILL_ILLOPC;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGILL, &info, current);

}

void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                         unsigned long psr)

{

        siginfo_t info;

        if(psr & PSR_PS)

                die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);

        info.si_signo = SIGILL;

        info.si_errno = 0;

        info.si_code = ILL_PRVOPC;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGILL, &info, current);

}

/* XXX User may want to be allowed to do this. XXX */

void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                            unsigned long psr)

{

        siginfo_t info;

        if(regs->psr & PSR_PS) {

                printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,

                       regs->u_regs[UREG_RETPC]);

                die_if_kernel("BOGUS", regs);

                /* die_if_kernel("Kernel MNA access", regs); */

        }

#if 0

        show_regs (regs);

        instruction_dump ((unsigned long *) regs->pc);

        printk ("do_MNA!\n");

#endif

        info.si_signo = SIGBUS;

        info.si_errno = 0;

        info.si_code = BUS_ADRALN;

        info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;

        info.si_trapno = 0;

        send_sig_info(SIGBUS, &info, current);

}

extern void fpsave(unsigned long *fpregs, unsigned long *fsr,

                   void *fpqueue, unsigned long *fpqdepth);

extern void fpload(unsigned long *fpregs, unsigned long *fsr);

static unsigned long init_fsr = 0x0UL;

static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =

                { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,

                  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,

                  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,

                  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };

void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                 unsigned long psr)

{

        /* Sanity check... */

        if(psr & PSR_PS)

                die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);

        put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */

        regs->psr |= PSR_EF;

#ifndef CONFIG_SMP

        if(last_task_used_math == current)

                return;

        if(last_task_used_math) {

                /* Other processes fpu state, save away */

                struct task_struct *fptask = last_task_used_math;

                fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,

                       &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);

        }

        last_task_used_math = current;

        if(used_math()) {

                fpload(&current->thread.float_regs[0], &current->thread.fsr);

        } else {

                /* Set initial sane state. */

                fpload(&init_fregs[0], &init_fsr);

                set_used_math();

        }

#else

        if(!used_math()) {

                fpload(&init_fregs[0], &init_fsr);

                set_used_math();

        } else {

                fpload(&current->thread.float_regs[0], &current->thread.fsr);

        }

        set_thread_flag(TIF_USEDFPU);

#endif

}

static unsigned long fake_regs[32] __attribute__ ((aligned (8)));

static unsigned long fake_fsr;

static unsigned long fake_queue[32] __attribute__ ((aligned (8)));

static unsigned long fake_depth;

extern int do_mathemu(struct pt_regs *, struct task_struct *);

void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                 unsigned long psr)

{

        static int calls;

        siginfo_t info;

        unsigned long fsr;

        int ret = 0;

#ifndef CONFIG_SMP

        struct task_struct *fpt = last_task_used_math;

#else

        struct task_struct *fpt = current;

#endif

        put_psr(get_psr() | PSR_EF);

        /* If nobody owns the fpu right now, just clear the

         * error into our fake static buffer and hope it don't

         * happen again.  Thank you crashme...

         */

#ifndef CONFIG_SMP

        if(!fpt) {

#else

        if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {

#endif

                fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);

                regs->psr &= ~PSR_EF;

                return;

        }

        fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,

               &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);

#ifdef DEBUG_FPU

        printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);

#endif

        switch ((fpt->thread.fsr & 0x1c000)) {

        /* switch on the contents of the ftt [floating point trap type] field */

#ifdef DEBUG_FPU

        case (1 << 14):

                printk("IEEE_754_exception\n");

                break;

#endif

        case (2 << 14):  /* unfinished_FPop (underflow & co) */

        case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */

                ret = do_mathemu(regs, fpt);

                break;

#ifdef DEBUG_FPU

        case (4 << 14):

                printk("sequence_error (OS bug...)\n");

                break;

        case (5 << 14):

                printk("hardware_error (uhoh!)\n");

                break;

        case (6 << 14):

                printk("invalid_fp_register (user error)\n");

                break;

#endif /* DEBUG_FPU */

        }

        /* If we successfully emulated the FPop, we pretend the trap never happened :-> */

        if (ret) {

                fpload(&current->thread.float_regs[0], &current->thread.fsr);

                return;

        }

        /* nope, better SIGFPE the offending process... */

#ifdef CONFIG_SMP

        clear_tsk_thread_flag(fpt, TIF_USEDFPU);

#endif

        if(psr & PSR_PS) {

                /* The first fsr store/load we tried trapped,

                 * the second one will not (we hope).

                 */

                printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",

                       regs->pc);

                regs->pc = regs->npc;

                regs->npc += 4;

                calls++;

                if(calls > 2)

                        die_if_kernel("Too many Penguin-FPU traps from kernel mode",

                                      regs);

                return;

        }

        fsr = fpt->thread.fsr;

        info.si_signo = SIGFPE;

        info.si_errno = 0;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        info.si_code = __SI_FAULT;

        if ((fsr & 0x1c000) == (1 << 14)) {

                if (fsr & 0x10)

                        info.si_code = FPE_FLTINV;

                else if (fsr & 0x08)

                        info.si_code = FPE_FLTOVF;

                else if (fsr & 0x04)

                        info.si_code = FPE_FLTUND;

                else if (fsr & 0x02)

                        info.si_code = FPE_FLTDIV;

                else if (fsr & 0x01)

                        info.si_code = FPE_FLTRES;

        }

        send_sig_info(SIGFPE, &info, fpt);

#ifndef CONFIG_SMP

        last_task_used_math = NULL;

#endif

        regs->psr &= ~PSR_EF;

        if(calls > 0)

                calls=0;

}

void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                         unsigned long psr)

{

        siginfo_t info;

        if(psr & PSR_PS)

                die_if_kernel("Penguin overflow trap from kernel mode", regs);

        info.si_signo = SIGEMT;

        info.si_errno = 0;

        info.si_code = EMT_TAGOVF;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGEMT, &info, current);

}

void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                       unsigned long psr)

{

#ifdef TRAP_DEBUG

        printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",

               pc, npc, psr);

#endif

        if(psr & PSR_PS)

                panic("Tell me what a watchpoint trap is, and I'll then deal "

                      "with such a beast...");

}

void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                       unsigned long psr)

{

        siginfo_t info;

#ifdef TRAP_DEBUG

        printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",

               pc, npc, psr);

#endif

        info.si_signo = SIGBUS;

        info.si_errno = 0;

        info.si_code = BUS_OBJERR;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        force_sig_info(SIGBUS, &info, current);

}

void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                        unsigned long psr)

{

        siginfo_t info;

        info.si_signo = SIGILL;

        info.si_errno = 0;

        info.si_code = ILL_COPROC;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGILL, &info, current);

}

void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                         unsigned long psr)

{

        siginfo_t info;

#ifdef TRAP_DEBUG

        printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",

               pc, npc, psr);

#endif

        info.si_signo = SIGILL;

        info.si_errno = 0;

        info.si_code = ILL_COPROC;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGILL, &info, current);

}

void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,

                       unsigned long psr)

{

        siginfo_t info;

        info.si_signo = SIGFPE;

        info.si_errno = 0;

        info.si_code = FPE_INTDIV;

        info.si_addr = (void __user *)pc;

        info.si_trapno = 0;

        send_sig_info(SIGFPE, &info, current);

}

#ifdef CONFIG_DEBUG_BUGVERBOSE

void do_BUG(const char *file, int line)

{

        // bust_spinlocks(1);   XXX Not in our original BUG()

        printk("kernel BUG at %s:%d!\n", file, line);

}

#endif

/* Since we have our mappings set up, on multiprocessors we can spin them

 * up here so that timer interrupts work during initialization.

 */

extern void sparc_cpu_startup(void);

int linux_smp_still_initting;

unsigned int thiscpus_tbr;

int thiscpus_mid;

void trap_init(void)

{

        extern void thread_info_offsets_are_bolixed_pete(void);

        /* Force linker to barf if mismatched */

        if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||

            TI_TASK        != offsetof(struct thread_info, task) ||

            TI_EXECDOMAIN  != offsetof(struct thread_info, exec_domain) ||

            TI_FLAGS       != offsetof(struct thread_info, flags) ||

            TI_CPU         != offsetof(struct thread_info, cpu) ||

            TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||

            TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||

            TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||

            TI_KSP         != offsetof(struct thread_info, ksp) ||

            TI_KPC         != offsetof(struct thread_info, kpc) ||

            TI_KPSR        != offsetof(struct thread_info, kpsr) ||

            TI_KWIM        != offsetof(struct thread_info, kwim) ||

            TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||

            TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||

            TI_W_SAVED     != offsetof(struct thread_info, w_saved))

                thread_info_offsets_are_bolixed_pete();

        /* Attach to the address space of init_task. */

        atomic_inc(&init_mm.mm_count);

        current->active_mm = &init_mm;

        /* NOTE: Other cpus have this done as they are started

         *       up on SMP.

         */

}