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/* $Id: traps.c,v 1.1 2005-12-20 09:50:43 jcastillo Exp $

 * arch/sparc/kernel/traps.c

 *

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

 */

/*

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

 */

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

#include <linux/kernel.h>

#include <linux/config.h>

#include <linux/signal.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/kdebug.h>

#include <asm/unistd.h>

#include <asm/traps.h>

#include <asm/smp.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, current->pid);

        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 die_if_kernel(char *str, struct pt_regs *regs)

{

        unsigned long i;

        unsigned long *pc;

        /* Amuse the user. */

        printk(

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

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

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

"                 \\__U_/\n");

        printk("%s(%d): %s\n", current->comm, current->pid, str);

        show_regs(regs);

#if CONFIG_AP1000

        ap_panic();

#endif

        printk("Instruction DUMP:");

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

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

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

        printk("\n");

        if(regs->psr & PSR_PS)

                do_exit(SIGKILL);

        do_exit(SIGSEGV);

}

void do_hw_interrupt(unsigned long type, unsigned long psr, unsigned long pc)

{

        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", current->tss.kregs);

        }

        if(type == SP_TRAP_SBPT) {

                send_sig(SIGTRAP, current, 1);

                return;

        }

        current->tss.sig_desc = SUBSIG_BADTRAP(type - 0x80);

        current->tss.sig_address = pc;

        send_sig(SIGILL, current, 1);

}

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

                            unsigned long psr)

{

        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

        current->tss.sig_address = pc;

        current->tss.sig_desc = SUBSIG_ILLINST;

        send_sig(SIGILL, current, 1);

}

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

                         unsigned long psr)

{

        if(psr & PSR_PS)

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

        current->tss.sig_address = pc;

        current->tss.sig_desc = SUBSIG_PRIVINST;

        send_sig(SIGILL, current, 1);

}

/* 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)

{

        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); */

        }

        current->tss.sig_address = pc;

        current->tss.sig_desc = SUBSIG_PRIVINST;

        send_sig(SIGBUS, current, 1);

}

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 __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->tss.float_regs[0], &fptask->tss.fsr,

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

        }

        last_task_used_math = current;

        if(current->used_math) {

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

        } else {

                /* Set initial sane state. */

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

                current->used_math = 1;

        }

#else

        if(!current->used_math) {

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

                current->used_math = 1;

        } else {

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

        }

        current->flags |= PF_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;

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

                 unsigned long psr)

{

        static calls = 0;

#ifndef __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 __SMP__

        if(!fpt) {

#else

        if(!(fpt->flags & PF_USEDFPU)) {

#endif

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

                regs->psr &= ~PSR_EF;

                return;

        }

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

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

        fpt->tss.sig_address = pc;

        fpt->tss.sig_desc = SUBSIG_FPERROR; /* as good as any */

#ifdef __SMP__

        fpt->flags &= ~PF_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;

        }

        send_sig(SIGFPE, fpt, 1);

#ifndef __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)

{

        if(psr & PSR_PS)

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

        current->tss.sig_address = pc;

        current->tss.sig_desc = SUBSIG_TAG; /* as good as any */

        send_sig(SIGEMT, current, 1);

}

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)

{

#ifdef TRAP_DEBUG

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

               pc, npc, psr);

#endif

        send_sig(SIGILL, current, 1);

}

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

                        unsigned long psr)

{

        send_sig(SIGILL, current, 1);

}

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

                      unsigned long psr)

{

#ifdef TRAP_DEBUG

        printk("Unimplemented FLUSH Exception at PC %08lx NPC %08lx PSR %08lx\n",

               pc, npc, psr);

#endif

        printk("INSTRUCTION=%08lx\n", *((unsigned long *) regs->pc));

        send_sig(SIGILL, current, 1);

}

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

                         unsigned long psr)

{

#ifdef TRAP_DEBUG

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

               pc, npc, psr);

#endif

        send_sig(SIGILL, current, 1);

}

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

                       unsigned long psr)

{

        send_sig(SIGILL, current, 1);

}

/* 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);

extern int linux_num_cpus;

extern ctxd_t *srmmu_ctx_table_phys;

int linux_smp_still_initting;

unsigned int thiscpus_tbr;

int thiscpus_mid;

void trap_init(void)

{

}