508 lines
13 KiB
C
508 lines
13 KiB
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 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();
|
|
}
|
|
|
|
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(¤t->thread.float_regs[0], ¤t->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(¤t->thread.float_regs[0], ¤t->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(¤t->thread.float_regs[0], ¤t->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.
|
|
*/
|
|
}
|