hi,
the latest information,
by add printk to the do_ri function in traps.c, I found that the
kernel panic after execute he simulate_sync function, the do_ri
function was called more than seven hundreds of times.
asmlinkage void do_ri(struct pt_regs *regs)
{
unsigned int __user *epc = (unsigned int __user
*)exception_epc(regs);
unsigned long old_epc = regs->cp0_epc;
unsigned int opcode = 0;
int status = -1;
static int count = 0;
printk("%d:do_ri called** ", count++);
if (notify_die(DIE_RI, "RI Fault", regs, SIGSEGV, 0, 0)
== NOTIFY_STOP)
{
printk("notify_die");
return;
}
die_if_kernel("Reserved instruction in kernel code", regs);
if (unlikely(compute_return_epc(regs) < 0))
{
printk("unlikely(compute_return_epc(regs) < 0)");
return;
}
if (unlikely(get_user(opcode, epc) < 0))
{
printk("unlikely(get_user(opcode, epc) < 0)");
status = SIGSEGV;
}
if (!cpu_has_llsc && status < 0)
{
printk("status = simulate_llsc(regs, %d)", opcode);
status = simulate_llsc(regs, opcode);
}
if (status < 0)
{
printk("status = simulate_rdhwr(regs, %d)", opcode); /
*******************print this message and the kernel
panic********************/
status = simulate_rdhwr(regs, opcode);
}
if (status < 0)
{
printk("status = simulate_sync(regs, %d)", opcode);
status = simulate_sync(regs, opcode);
}
if (status < 0)
{
printk("status = SIGILL");
status = SIGILL;
}
if (unlikely(status > 0)) {
printk("unlikely(status > 0)");
regs->cp0_epc = old_epc; /* Undo skip-over. */
force_sig(status, current);
printk("force_sig(status, current)");
}
the out put of "printk("status = simulate_rdhwr(regs, %d)", opcode);
" is status = simulate_rdhwr(regs, 2080565307), I don't known what the
mean of opcode, if it is the machine code of instruction, can anyone
tips me?
today, i also did another experiments, with the help of busybox, I
made a root file system, by using which I enter the shell in the
android linux kernel, and I execute the init program of the android
file system, the result is as follows:
1 do_ri called** status = simulate_rdhwr(regs, 2080565307)2 do_ri
called** status = simulate_rdhwr(regs, 2080565307)3 do_ri called**
status = simulate_rdhwr(regs, 2080565307)
.........
700 do_ri called** status = simulate_rdhwr(regs, 2080565307)701 do_ri
called** status = simulate_rdhwr(regs, 2080565307)
A N D R O I D Segmentation failure.
any suggestion?
andy
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