/* $Id: traps.c,v 1.43 1996/04/24 09:09:42 davem 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(¤t->tss.float_regs[0], ¤t->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(¤t->tss.float_regs[0], ¤t->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)
{
}
