void
gdb_arch_read_reg(unsigned long regnum, struct cpu_user_regs *regs,
struct gdb_context *ctx)
{
struct gdb_callback_arg arg;
unsigned long reg;
struct pt_fpreg freg;
char buf[16 * 2 + 1];
if (regnum >= NUM_REGS) {
dbg_printk("%s: regnum %ld\n", __func__, regnum);
goto out_err;
}
arg.regs = regs;
arg.regnum = regnum;
arg.reg = ®
arg.freg = &freg;
arg.error = 0;
unw_init_running(&gdb_get_reg_callback, (void*)&arg);
if (arg.error < 0) {
dbg_printk("%s: gdb_get_reg_callback failed\n", __func__);
goto out_err;
}
if (arg.error > 0) {
// notify gdb that this register is not supported.
// see fetch_register_using_p() in gdb/remote.c.
safe_strcpy(buf, "x");
} else if (IA64_FR0_REGNUM <= regnum && regnum <= IA64_FR0_REGNUM + 127) {
snprintf(buf, sizeof(buf), "%.016lx", swab64(freg.u.bits[0]));
snprintf(buf + 16, sizeof(buf) - 16, "%.016lx", swab64(freg.u.bits[1]));
} else {
snprintf(buf, sizeof(buf), "%.016lx", swab64(reg));
}
out:
return gdb_send_reply(buf, ctx);
out_err:
dbg_printk("Register read unsupported regnum = 0x%lx\n", regnum);
safe_strcpy(buf, "E0");
goto out;
}
irqreturn_t
handle_IPI (int irq, void *dev_id)
{
int this_cpu = get_cpu();
unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);
unsigned long ops;
mb(); /* */
while ((ops = xchg(pending_ipis, 0)) != 0) {
mb(); /* */
do {
unsigned long which;
which = ffz(~ops);
ops &= ~(1 << which);
switch (which) {
case IPI_CPU_STOP:
stop_this_cpu();
break;
case IPI_CALL_FUNC:
generic_smp_call_function_interrupt();
break;
case IPI_CALL_FUNC_SINGLE:
generic_smp_call_function_single_interrupt();
break;
#ifdef CONFIG_KEXEC
case IPI_KDUMP_CPU_STOP:
unw_init_running(kdump_cpu_freeze, NULL);
break;
#endif
default:
printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
this_cpu, which);
break;
}
} while (ops);
mb(); /* */
}
put_cpu();
return IRQ_HANDLED;
}
void
ia64_backtrace(struct pt_regs * const regs, unsigned int depth)
{
ia64_backtrace_t bt;
unsigned long flags;
/*
*/
if (user_mode(regs))
return;
bt.depth = depth;
bt.regs = regs;
bt.prev_pfs_loc = NULL;
local_irq_save(flags);
unw_init_running(do_ia64_backtrace, &bt);
local_irq_restore(flags);
}
void
ia64_backtrace(struct pt_regs * const regs, unsigned int depth)
{
ia64_backtrace_t bt;
unsigned long flags;
/*
* On IA64 there is little hope of getting backtraces from
* user space programs -- the problems of getting the unwind
* information from arbitrary user programs are extreme.
*/
if (user_mode(regs))
return;
bt.depth = depth;
bt.regs = regs;
bt.prev_pfs_loc = NULL;
local_irq_save(flags);
unw_init_running(do_ia64_backtrace, &bt);
local_irq_restore(flags);
}
void machine_kexec(struct kimage *image)
{
BUG_ON(!image);
unw_init_running(ia64_machine_kexec, image);
for(;;);
}
/*
* Save stack-backtrace addresses into a stack_trace buffer.
*/
void save_stack_trace(struct stack_trace *trace)
{
unw_init_running(ia64_do_save_stack, trace);
}
void machine_kexec(xen_kexec_image_t *image)
{
machine_shutdown();
unw_init_running(ia64_machine_kexec, image);
for(;;);
}