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/* $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/config.h>
#include <linux/sched.h> /* for jiffies */
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/smp_lock.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>
/* #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 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)
{
int count = 0;
/* Amuse the user. */
printk(
" \\|/ ____ \\|/\n"
" \"@'/ ,. \\`@\"\n"
" /_| \\__/ |_\\\n"
" \\__U_/\n");
printk("%s(%d): %s\n", current->comm, current->pid, str);
show_regs(regs);
__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]\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(unsigned long type, unsigned long psr, unsigned long pc)
{
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", current->thread.kregs);
}
if(psr & PSR_PS)
die_if_kernel("Kernel bad trap", current->thread.kregs);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void *)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)
{
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 (sparc_cpu_model == sun4c || sparc_cpu_model == sun4) {
extern int do_user_muldiv (struct pt_regs *, unsigned long);
if (!do_user_muldiv (regs, pc))
return;
}
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void *)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 *)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(current->used_math) {
fpload(¤t->thread.float_regs[0], ¤t->thread.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(¤t->thread.float_regs[0], ¤t->thread.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;
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 = 0;
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(!(fpt->flags & PF_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(¤t->thread.float_regs[0], ¤t->thread.fsr);
return;
}
/* nope, better SIGFPE the offending process... */
#ifdef CONFIG_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;
}
fsr = fpt->thread.fsr;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void *)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 *)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 *)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 *)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 *)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 *)pc;
info.si_trapno = 0;
send_sig_info(SIGFPE, &info, current);
}
/* 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)
{
/* 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.
*/
}
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