[linux-2.6-block.git] / arch / sparc / kernel / traps_32.c

/*
 * arch/sparc/kernel/traps.c
 *
 * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
 * 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/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;
};

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 sun4d_nmi(struct pt_regs *regs)
{
	printk("Aieee: sun4d NMI received!\n");
	printk("you lose buddy boy...\n");
	show_regs(regs);
	prom_halt();
}

static 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]: %pS\n", rw->ins[7],
			       (void *) 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);

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.
	 */
}
Commit	Line	Data
88278ca2	1	/*
1da177e4 LT	2	* arch/sparc/kernel/traps.c
1da177e4 LT	3	*
4fe3ebec	4	* Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
1da177e4 LT	5	* Copyright 2000 Jakub Jelinek (jakub@redhat.com)
	6	*/
	7
	8	/*
	9	* I hate traps on the sparc, grrr...
	10	*/
	11
1da177e4 LT	12	#include <linux/sched.h> /* for jiffies */
1da177e4 LT	13	#include <linux/kernel.h>
1da177e4 LT	14	#include <linux/signal.h>
	15	#include <linux/smp.h>
	16	#include <linux/smp_lock.h>
1eeb66a1	17	#include <linux/kdebug.h>
1da177e4 LT	18
	19	#include <asm/delay.h>
	20	#include <asm/system.h>
	21	#include <asm/ptrace.h>
	22	#include <asm/oplib.h>
	23	#include <asm/page.h>
	24	#include <asm/pgtable.h>
1da177e4 LT	25	#include <asm/unistd.h>
	26	#include <asm/traps.h>
	27
	28	/* #define TRAP_DEBUG */
	29
	30	struct trap_trace_entry {
	31	unsigned long pc;
	32	unsigned long type;
	33	};
	34
1da177e4 LT	35	void syscall_trace_entry(struct pt_regs *regs)
1da177e4 LT	36	{
19c5870c	37	printk("%s[%d]: ", current->comm, task_pid_nr(current));
1da177e4 LT	38	printk("scall<%d> (could be %d)\n", (int) regs->u_regs[UREG_G1],
	39	(int) regs->u_regs[UREG_I0]);
	40	}
	41
	42	void syscall_trace_exit(struct pt_regs *regs)
	43	{
	44	}
	45
1da177e4 LT	46	void sun4d_nmi(struct pt_regs *regs)
	47	{
	48	printk("Aieee: sun4d NMI received!\n");
	49	printk("you lose buddy boy...\n");
	50	show_regs(regs);
	51	prom_halt();
	52	}
	53
c61c65cd	54	static void instruction_dump(unsigned long *pc)
1da177e4 LT	55	{
	56	int i;
	57
	58	if((((unsigned long) pc) & 3))
	59	return;
	60
	61	for(i = -3; i < 6; i++)
	62	printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
	63	printk("\n");
	64	}
	65
	66	#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
	67	#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
	68
	69	void die_if_kernel(char str, struct pt_regs regs)
	70	{
	71	static int die_counter;
	72	int count = 0;
	73
	74	/* Amuse the user. */
	75	printk(
	76	" \\\|/ ____ \\\|/\n"
	77	" \"@'/ ,. \\`@\"\n"
	78	" /_\| \\__/ \|_\\\n"
	79	" \\__U_/\n");
	80
19c5870c	81	printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
1da177e4	82	show_regs(regs);
bcdcd8e7	83	add_taint(TAINT_DIE);
1da177e4 LT	84
	85	__SAVE; __SAVE; __SAVE; __SAVE;
	86	__SAVE; __SAVE; __SAVE; __SAVE;
	87	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
	88	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
	89
	90	{
	91	struct reg_window rw = (struct reg_window )regs->u_regs[UREG_FP];
	92
	93	/* Stop the back trace when we hit userland or we
	94	* find some badly aligned kernel stack. Set an upper
	95	* bound in case our stack is trashed and we loop.
	96	*/
	97	while(rw &&
	98	count++ < 30 &&
	99	(((unsigned long) rw) >= PAGE_OFFSET) &&
	100	!(((unsigned long) rw) & 0x7)) {
4fe3ebec DM	101	printk("Caller[%08lx]: %pS\n", rw->ins[7],
4fe3ebec DM	102	(void *) rw->ins[7]);
1da177e4 LT	103	rw = (struct reg_window *)rw->ins[6];
	104	}
	105	}
	106	printk("Instruction DUMP:");
	107	instruction_dump ((unsigned long *) regs->pc);
	108	if(regs->psr & PSR_PS)
	109	do_exit(SIGKILL);
	110	do_exit(SIGSEGV);
	111	}
	112
	113	void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
	114	{
	115	siginfo_t info;
	116
	117	if(type < 0x80) {
	118	/* Sun OS's puke from bad traps, Linux survives! */
	119	printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
	120	die_if_kernel("Whee... Hello Mr. Penguin", regs);
	121	}
	122
	123	if(regs->psr & PSR_PS)
	124	die_if_kernel("Kernel bad trap", regs);
	125
	126	info.si_signo = SIGILL;
	127	info.si_errno = 0;
	128	info.si_code = ILL_ILLTRP;
	129	info.si_addr = (void __user *)regs->pc;
	130	info.si_trapno = type - 0x80;
	131	force_sig_info(SIGILL, &info, current);
	132	}
	133
	134	void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
	135	unsigned long psr)
	136	{
	137	extern int do_user_muldiv (struct pt_regs *, unsigned long);
	138	siginfo_t info;
	139
	140	if(psr & PSR_PS)
	141	die_if_kernel("Kernel illegal instruction", regs);
	142	#ifdef TRAP_DEBUG
	143	printk("Ill instr. at pc=%08lx instruction is %08lx\n",
	144	regs->pc, (unsigned long )regs->pc);
	145	#endif
	146	if (!do_user_muldiv (regs, pc))
	147	return;
	148
	149	info.si_signo = SIGILL;
	150	info.si_errno = 0;
	151	info.si_code = ILL_ILLOPC;
	152	info.si_addr = (void __user *)pc;
	153	info.si_trapno = 0;
	154	send_sig_info(SIGILL, &info, current);
	155	}
	156
	157	void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
	158	unsigned long psr)
	159	{
	160	siginfo_t info;
	161
	162	if(psr & PSR_PS)
	163	die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
	164	info.si_signo = SIGILL;
	165	info.si_errno = 0;
	166	info.si_code = ILL_PRVOPC;
167	info.si_addr = (void __user *)pc;
168	info.si_trapno = 0;
169	send_sig_info(SIGILL, &info, current);
170	}
171
172	/* XXX User may want to be allowed to do this. XXX */
173
174	void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
175	unsigned long psr)
176	{
177	siginfo_t info;
178
179	if(regs->psr & PSR_PS) {
180	printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
181	regs->u_regs[UREG_RETPC]);
182	die_if_kernel("BOGUS", regs);
183	/* die_if_kernel("Kernel MNA access", regs); */
184	}
185	#if 0
186	show_regs (regs);
187	instruction_dump ((unsigned long *) regs->pc);
188	printk ("do_MNA!\n");
189	#endif
190	info.si_signo = SIGBUS;
191	info.si_errno = 0;
192	info.si_code = BUS_ADRALN;
193	info.si_addr = /* FIXME: Should dig out mna address / (void )0;
194	info.si_trapno = 0;
195	send_sig_info(SIGBUS, &info, current);
196	}
197
198	extern void fpsave(unsigned long fpregs, unsigned long fsr,
199	void fpqueue, unsigned long fpqdepth);
200	extern void fpload(unsigned long fpregs, unsigned long fsr);
201
202	static unsigned long init_fsr = 0x0UL;
203	static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
204	{ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
205	~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
206	~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
207	~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
208
209	void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
210	unsigned long psr)
211	{
212	/* Sanity check... */
213	if(psr & PSR_PS)
214	die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
215
216	put_psr(get_psr() \| PSR_EF); /* Allow FPU ops. */
217	regs->psr \|= PSR_EF;
218	#ifndef CONFIG_SMP
219	if(last_task_used_math == current)
220	return;
221	if(last_task_used_math) {
222	/* Other processes fpu state, save away */
223	struct task_struct *fptask = last_task_used_math;
224	fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
225	&fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
226	}
227	last_task_used_math = current;
228	if(used_math()) {
229	fpload(&current->thread.float_regs[0], &current->thread.fsr);
230	} else {
231	/* Set initial sane state. */
232	fpload(&init_fregs[0], &init_fsr);
233	set_used_math();
234	}
235	#else
236	if(!used_math()) {
237	fpload(&init_fregs[0], &init_fsr);
238	set_used_math();
239	} else {
240	fpload(&current->thread.float_regs[0], &current->thread.fsr);
241	}
54f565ea	242	set_thread_flag(TIF_USEDFPU);
1da177e4 LT	243	#endif
	244	}
	245
	246	static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
	247	static unsigned long fake_fsr;
	248	static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
	249	static unsigned long fake_depth;
	250
	251	extern int do_mathemu(struct pt_regs , struct task_struct );
	252
	253	void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
	254	unsigned long psr)
	255	{
	256	static int calls;
	257	siginfo_t info;
	258	unsigned long fsr;
	259	int ret = 0;
	260	#ifndef CONFIG_SMP
	261	struct task_struct *fpt = last_task_used_math;
	262	#else
	263	struct task_struct *fpt = current;
	264	#endif
	265	put_psr(get_psr() \| PSR_EF);
	266	/* If nobody owns the fpu right now, just clear the
	267	* error into our fake static buffer and hope it don't
	268	* happen again. Thank you crashme...
	269	*/
	270	#ifndef CONFIG_SMP
	271	if(!fpt) {
	272	#else
54f565ea	273	if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
1da177e4 LT	274	#endif
	275	fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
	276	regs->psr &= ~PSR_EF;
	277	return;
	278	}
	279	fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
	280	&fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
	281	#ifdef DEBUG_FPU
	282	printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
	283	#endif
	284
	285	switch ((fpt->thread.fsr & 0x1c000)) {
	286	/* switch on the contents of the ftt [floating point trap type] field */
	287	#ifdef DEBUG_FPU
	288	case (1 << 14):
	289	printk("IEEE_754_exception\n");
	290	break;
	291	#endif
	292	case (2 << 14): /* unfinished_FPop (underflow & co) */
	293	case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
	294	ret = do_mathemu(regs, fpt);
	295	break;
	296	#ifdef DEBUG_FPU
	297	case (4 << 14):
	298	printk("sequence_error (OS bug...)\n");
	299	break;
	300	case (5 << 14):
	301	printk("hardware_error (uhoh!)\n");
	302	break;
	303	case (6 << 14):
	304	printk("invalid_fp_register (user error)\n");
	305	break;
	306	#endif /* DEBUG_FPU */
	307	}
	308	/* If we successfully emulated the FPop, we pretend the trap never happened :-> */
	309	if (ret) {
	310	fpload(&current->thread.float_regs[0], &current->thread.fsr);
	311	return;
	312	}
	313	/* nope, better SIGFPE the offending process... */
	314
	315	#ifdef CONFIG_SMP
54f565ea	316	clear_tsk_thread_flag(fpt, TIF_USEDFPU);
1da177e4 LT	317	#endif
	318	if(psr & PSR_PS) {
	319	/* The first fsr store/load we tried trapped,
	320	* the second one will not (we hope).
	321	*/
	322	printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
	323	regs->pc);
	324	regs->pc = regs->npc;
	325	regs->npc += 4;
	326	calls++;
	327	if(calls > 2)
	328	die_if_kernel("Too many Penguin-FPU traps from kernel mode",
	329	regs);
	330	return;
	331	}
	332
	333	fsr = fpt->thread.fsr;
	334	info.si_signo = SIGFPE;
	335	info.si_errno = 0;
	336	info.si_addr = (void __user *)pc;
	337	info.si_trapno = 0;
	338	info.si_code = __SI_FAULT;
	339	if ((fsr & 0x1c000) == (1 << 14)) {
	340	if (fsr & 0x10)
	341	info.si_code = FPE_FLTINV;
	342	else if (fsr & 0x08)
	343	info.si_code = FPE_FLTOVF;
	344	else if (fsr & 0x04)
	345	info.si_code = FPE_FLTUND;
	346	else if (fsr & 0x02)
	347	info.si_code = FPE_FLTDIV;
	348	else if (fsr & 0x01)
	349	info.si_code = FPE_FLTRES;
	350	}
	351	send_sig_info(SIGFPE, &info, fpt);
	352	#ifndef CONFIG_SMP
	353	last_task_used_math = NULL;
	354	#endif
	355	regs->psr &= ~PSR_EF;
	356	if(calls > 0)
	357	calls=0;
	358	}
	359
	360	void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
	361	unsigned long psr)
	362	{
	363	siginfo_t info;
	364
	365	if(psr & PSR_PS)
	366	die_if_kernel("Penguin overflow trap from kernel mode", regs);
	367	info.si_signo = SIGEMT;
	368	info.si_errno = 0;
	369	info.si_code = EMT_TAGOVF;
	370	info.si_addr = (void __user *)pc;
	371	info.si_trapno = 0;
	372	send_sig_info(SIGEMT, &info, current);
	373	}
	374
	375	void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
	376	unsigned long psr)
	377	{
	378	#ifdef TRAP_DEBUG
	379	printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
	380	pc, npc, psr);
381	#endif
382	if(psr & PSR_PS)
383	panic("Tell me what a watchpoint trap is, and I'll then deal "
384	"with such a beast...");
385	}
386
387	void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
388	unsigned long psr)
389	{
390	siginfo_t info;
391
392	#ifdef TRAP_DEBUG
393	printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
394	pc, npc, psr);
395	#endif
396	info.si_signo = SIGBUS;
397	info.si_errno = 0;
398	info.si_code = BUS_OBJERR;
399	info.si_addr = (void __user *)pc;
400	info.si_trapno = 0;
401	force_sig_info(SIGBUS, &info, current);
402	}
403
404	void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
405	unsigned long psr)
406	{
407	siginfo_t info;
408
409	info.si_signo = SIGILL;
410	info.si_errno = 0;
411	info.si_code = ILL_COPROC;
412	info.si_addr = (void __user *)pc;
413	info.si_trapno = 0;
414	send_sig_info(SIGILL, &info, current);
415	}
416
417	void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
418	unsigned long psr)
419	{
420	siginfo_t info;
421
422	#ifdef TRAP_DEBUG
423	printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
424	pc, npc, psr);
425	#endif
426	info.si_signo = SIGILL;
427	info.si_errno = 0;
428	info.si_code = ILL_COPROC;
429	info.si_addr = (void __user *)pc;
430	info.si_trapno = 0;
431	send_sig_info(SIGILL, &info, current);
432	}
433
434	void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
435	unsigned long psr)
436	{
437	siginfo_t info;
438
439	info.si_signo = SIGFPE;
440	info.si_errno = 0;
441	info.si_code = FPE_INTDIV;
442	info.si_addr = (void __user *)pc;
443	info.si_trapno = 0;
444	send_sig_info(SIGFPE, &info, current);
445	}
446
447	#ifdef CONFIG_DEBUG_BUGVERBOSE
448	void do_BUG(const char *file, int line)
449	{
450	// bust_spinlocks(1); XXX Not in our original BUG()
451	printk("kernel BUG at %s:%d!\n", file, line);
452	}
453	#endif
454
455	/* Since we have our mappings set up, on multiprocessors we can spin them
456	* up here so that timer interrupts work during initialization.
457	*/
458
459	extern void sparc_cpu_startup(void);
460
1da177e4 LT	461	void trap_init(void)
	462	{
	463	extern void thread_info_offsets_are_bolixed_pete(void);
	464
	465	/* Force linker to barf if mismatched */
	466	if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) \|\|
	467	TI_TASK != offsetof(struct thread_info, task) \|\|
	468	TI_EXECDOMAIN != offsetof(struct thread_info, exec_domain) \|\|
	469	TI_FLAGS != offsetof(struct thread_info, flags) \|\|
	470	TI_CPU != offsetof(struct thread_info, cpu) \|\|
	471	TI_PREEMPT != offsetof(struct thread_info, preempt_count) \|\|
	472	TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) \|\|
	473	TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) \|\|
	474	TI_KSP != offsetof(struct thread_info, ksp) \|\|
	475	TI_KPC != offsetof(struct thread_info, kpc) \|\|
	476	TI_KPSR != offsetof(struct thread_info, kpsr) \|\|
	477	TI_KWIM != offsetof(struct thread_info, kwim) \|\|
	478	TI_REG_WINDOW != offsetof(struct thread_info, reg_window) \|\|
	479	TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) \|\|
	480	TI_W_SAVED != offsetof(struct thread_info, w_saved))
	481	thread_info_offsets_are_bolixed_pete();
	482
	483	/* Attach to the address space of init_task. */
	484	atomic_inc(&init_mm.mm_count);
	485	current->active_mm = &init_mm;
	486
	487	/* NOTE: Other cpus have this done as they are started
	488	* up on SMP.
	489	*/
	490	}