/*
* kdb_trap - field a TRACE or BPT trap
*/
int
kdb_trap(int type, int code, struct i386_saved_state *regs)
{
volatile int ddb_mode = !(boothowto & RB_GDB);
/*
* XXX try to do nothing if the console is in graphics mode.
* Handle trace traps (and hardware breakpoints...) by ignoring
* them except for forgetting about them. Return 0 for other
* traps to say that we haven't done anything. The trap handler
* will usually panic. We should handle breakpoint traps for
* our breakpoints by disarming our breakpoints and fixing up
* %eip.
*/
if (cons_unavail && ddb_mode) {
if (type == T_TRCTRAP) {
regs->tf_eflags &= ~PSL_T;
return (1);
}
return (0);
}
switch (type) {
case T_BPTFLT: /* breakpoint */
case T_TRCTRAP: /* debug exception */
break;
default:
/*
* XXX this is almost useless now. In most cases,
* trap_fatal() has already printed a much more verbose
* message. However, it is dangerous to print things in
* trap_fatal() - kprintf() might be reentered and trap.
* The debugger should be given control first.
*/
if (ddb_mode)
db_printf("kernel: type %d trap, code=%x\n", type, code);
if (db_nofault) {
jmp_buf *no_fault = db_nofault;
db_nofault = NULL;
longjmp(*no_fault, 1);
}
}
/*
* This handles unexpected traps in ddb commands, including calls to
* non-ddb functions. db_nofault only applies to memory accesses by
* internal ddb commands.
*/
if (db_global_jmpbuf_valid)
longjmp(db_global_jmpbuf, 1);
/*
* XXX We really should switch to a local stack here.
*/
ddb_regs = *regs;
/*
* If in kernel mode, esp and ss are not saved, so dummy them up.
*/
if (ISPL(regs->tf_cs) == 0) {
ddb_regs.tf_esp = (int)®s->tf_esp;
ddb_regs.tf_ss = rss();
}
crit_enter();
#ifdef SMP
db_printf("\nCPU%d stopping CPUs: 0x%08x\n",
mycpu->gd_cpuid, mycpu->gd_other_cpus);
/* We stop all CPUs except ourselves (obviously) */
stop_cpus(mycpu->gd_other_cpus);
db_printf(" stopped\n");
#endif /* SMP */
setjmp(db_global_jmpbuf);
db_global_jmpbuf_valid = TRUE;
db_active++;
if (ddb_mode) {
cndbctl(TRUE);
db_trap(type, code);
cndbctl(FALSE);
} else
gdb_handle_exception(&ddb_regs, type, code);
db_active--;
db_global_jmpbuf_valid = FALSE;
#ifdef SMP
db_printf("\nCPU%d restarting CPUs: 0x%08x\n",
mycpu->gd_cpuid, stopped_cpus);
/* Restart all the CPUs we previously stopped */
if (stopped_cpus != mycpu->gd_other_cpus) {
db_printf("whoa, other_cpus: 0x%08x, stopped_cpus: 0x%08x\n",
mycpu->gd_other_cpus, stopped_cpus);
panic("stop_cpus() failed");
}
restart_cpus(stopped_cpus);
db_printf(" restarted\n");
#endif /* SMP */
crit_exit();
regs->tf_eip = ddb_regs.tf_eip;
regs->tf_eflags = ddb_regs.tf_eflags;
regs->tf_eax = ddb_regs.tf_eax;
regs->tf_ecx = ddb_regs.tf_ecx;
regs->tf_edx = ddb_regs.tf_edx;
regs->tf_ebx = ddb_regs.tf_ebx;
/*
* If in user mode, the saved ESP and SS were valid, restore them.
*/
if (ISPL(regs->tf_cs)) {
regs->tf_esp = ddb_regs.tf_esp;
regs->tf_ss = ddb_regs.tf_ss & 0xffff;
}
regs->tf_ebp = ddb_regs.tf_ebp;
regs->tf_esi = ddb_regs.tf_esi;
regs->tf_edi = ddb_regs.tf_edi;
regs->tf_es = ddb_regs.tf_es & 0xffff;
regs->tf_fs = ddb_regs.tf_fs & 0xffff;
regs->tf_gs = ddb_regs.tf_gs & 0xffff;
regs->tf_cs = ddb_regs.tf_cs & 0xffff;
regs->tf_ds = ddb_regs.tf_ds & 0xffff;
return (1);
}
/*
* kdb_trap - field a TRACE or BPT trap
*/
int
kdb_trap(int type, int code, struct x86_64_saved_state *regs)
{
volatile int ddb_mode = !(boothowto & RB_GDB);
/*
* XXX try to do nothing if the console is in graphics mode.
* Handle trace traps (and hardware breakpoints...) by ignoring
* them except for forgetting about them. Return 0 for other
* traps to say that we haven't done anything. The trap handler
* will usually panic. We should handle breakpoint traps for
* our breakpoints by disarming our breakpoints and fixing up
* %eip.
*/
if (cons_unavail && ddb_mode) {
if (type == T_TRCTRAP) {
regs->tf_rflags &= ~PSL_T;
return (1);
}
return (0);
}
switch (type) {
case T_BPTFLT: /* breakpoint */
case T_TRCTRAP: /* debug exception */
break;
default:
/*
* XXX this is almost useless now. In most cases,
* trap_fatal() has already printed a much more verbose
* message. However, it is dangerous to print things in
* trap_fatal() - kprintf() might be reentered and trap.
* The debugger should be given control first.
*/
if (ddb_mode)
db_printf("kernel: type %d trap, code=%x\n", type, code);
if (db_nofault) {
jmp_buf *no_fault = db_nofault;
db_nofault = NULL;
longjmp(*no_fault, 1);
}
}
/*
* This handles unexpected traps in ddb commands, including calls to
* non-ddb functions. db_nofault only applies to memory accesses by
* internal ddb commands.
*/
if (db_global_jmpbuf_valid)
longjmp(db_global_jmpbuf, 1);
/*
* XXX We really should switch to a local stack here.
*/
ddb_regs = *regs;
crit_enter();
db_printf("\nCPU%d stopping CPUs: 0x%016jx\n",
mycpu->gd_cpuid, (uintmax_t)CPUMASK_LOWMASK(mycpu->gd_other_cpus));
/* We stop all CPUs except ourselves (obviously) */
stop_cpus(mycpu->gd_other_cpus);
db_printf(" stopped\n");
setjmp(db_global_jmpbuf);
db_global_jmpbuf_valid = TRUE;
db_active++;
vcons_set_mode(1);
if (ddb_mode) {
cndbctl(TRUE);
db_trap(type, code);
cndbctl(FALSE);
} else
gdb_handle_exception(&ddb_regs, type, code);
db_active--;
vcons_set_mode(0);
db_global_jmpbuf_valid = FALSE;
db_printf("\nCPU%d restarting CPUs: 0x%016jx\n",
mycpu->gd_cpuid, (uintmax_t)CPUMASK_LOWMASK(stopped_cpus));
/* Restart all the CPUs we previously stopped */
if (CPUMASK_CMPMASKNEQ(stopped_cpus, mycpu->gd_other_cpus)) {
db_printf("whoa, other_cpus: 0x%016jx, "
"stopped_cpus: 0x%016jx\n",
(uintmax_t)CPUMASK_LOWMASK(mycpu->gd_other_cpus),
(uintmax_t)CPUMASK_LOWMASK(stopped_cpus));
panic("stop_cpus() failed");
}
restart_cpus(stopped_cpus);
db_printf(" restarted\n");
crit_exit();
regs->tf_rip = ddb_regs.tf_rip;
regs->tf_rflags = ddb_regs.tf_rflags;
regs->tf_rax = ddb_regs.tf_rax;
regs->tf_rcx = ddb_regs.tf_rcx;
regs->tf_rdx = ddb_regs.tf_rdx;
regs->tf_rbx = ddb_regs.tf_rbx;
regs->tf_rsp = ddb_regs.tf_rsp;
regs->tf_ss = ddb_regs.tf_ss & 0xffff;
regs->tf_rbp = ddb_regs.tf_rbp;
regs->tf_rsi = ddb_regs.tf_rsi;
regs->tf_rdi = ddb_regs.tf_rdi;
regs->tf_r8 = ddb_regs.tf_r8;
regs->tf_r9 = ddb_regs.tf_r9;
regs->tf_r10 = ddb_regs.tf_r10;
regs->tf_r11 = ddb_regs.tf_r11;
regs->tf_r12 = ddb_regs.tf_r12;
regs->tf_r13 = ddb_regs.tf_r13;
regs->tf_r14 = ddb_regs.tf_r14;
regs->tf_r15 = ddb_regs.tf_r15;
/* regs->tf_es = ddb_regs.tf_es & 0xffff; */
/* regs->tf_fs = ddb_regs.tf_fs & 0xffff; */
/* regs->tf_gs = ddb_regs.tf_gs & 0xffff; */
regs->tf_cs = ddb_regs.tf_cs & 0xffff;
/* regs->tf_ds = ddb_regs.tf_ds & 0xffff; */
return (1);
}
/*
* ddb_trap - field a kernel trap
*/
int
kdb_trap(int vector, struct trapframe *regs)
{
int ddb_mode = !(boothowto & RB_GDB);
register_t s;
/*
* Don't bother checking for usermode, since a benign entry
* by the kernel (call to Debugger() or a breakpoint) has
* already checked for usermode. If neither of those
* conditions exist, something Bad has happened.
*/
if (vector != IA64_VEC_BREAK
&& vector != IA64_VEC_SINGLE_STEP_TRAP) {
#if 0
if (ddb_mode) {
db_printf("ddbprinttrap from 0x%lx\n", /* XXX */
regs->tf_regs[FRAME_PC]);
ddbprinttrap(a0, a1, a2, entry);
/*
* Tell caller "We did NOT handle the trap."
* Caller should panic, or whatever.
*/
return (0);
}
#endif
if (db_nofault) {
jmp_buf *no_fault = db_nofault;
db_nofault = 0;
longjmp(*no_fault, 1);
}
}
/*
* XXX Should switch to DDB's own stack, here.
*/
s = intr_disable();
#ifdef SMP
#ifdef CPUSTOP_ON_DDBBREAK
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf("CPU%d stopping CPUs: 0x%08x...", PCPU_GET(cpuid),
PCPU_GET(other_cpus));
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
/* We stop all CPUs except ourselves (obviously) */
stop_cpus(PCPU_GET(other_cpus));
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf(" stopped.\n");
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
#endif /* CPUSTOP_ON_DDBBREAK */
#endif /* SMP */
ddb_regs = *regs;
/*
* XXX pretend that registers outside the current frame don't exist.
*/
db_eregs = db_regs + DB_MISC_REGS + 8 + 32
+ (ddb_regs.tf_cr_ifs & 0x7f);
__asm __volatile("flushrs"); /* so we can look at them */
db_active++;
if (ddb_mode) {
cndbctl(TRUE); /* DDB active, unblank video */
db_trap(vector, 0); /* Where the work happens */
cndbctl(FALSE); /* DDB inactive */
} else
gdb_handle_exception(&ddb_regs, vector);
db_active--;
#ifdef SMP
#ifdef CPUSTOP_ON_DDBBREAK
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf("CPU%d restarting CPUs: 0x%08x...", PCPU_GET(cpuid),
stopped_cpus);
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
/* Restart all the CPUs we previously stopped */
if (stopped_cpus != PCPU_GET(other_cpus) && smp_started != 0) {
db_printf("whoa, other_cpus: 0x%08x, stopped_cpus: 0x%08x\n",
PCPU_GET(other_cpus), stopped_cpus);
panic("stop_cpus() failed");
}
restart_cpus(stopped_cpus);
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf(" restarted.\n");
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
#endif /* CPUSTOP_ON_DDBBREAK */
#endif /* SMP */
*regs = ddb_regs;
intr_restore(s);
/*
* Tell caller "We HAVE handled the trap."
*/
return (1);
}
