/*
- * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* Hardware trap/fault handler.
*/
-#include <mach_kdb.h>
-#include <mach_kgdb.h>
#include <mach_kdp.h>
#include <mach_ldebug.h>
#include <kern/spl.h>
#include <kern/misc_protos.h>
#include <kern/debug.h>
-
+#if CONFIG_TELEMETRY
+#include <kern/telemetry.h>
+#endif
#include <sys/kdebug.h>
-
-#if MACH_KGDB
-#include <kgdb/kgdb_defs.h>
-#endif /* MACH_KGDB */
-
-#if MACH_KDB
-#include <debug.h>
-#include <ddb/db_watch.h>
-#include <ddb/db_run.h>
-#include <ddb/db_break.h>
-#include <ddb/db_trap.h>
-#endif /* MACH_KDB */
+#include <prng/random.h>
#include <string.h>
#include <mach/i386/syscall_sw.h>
#include <libkern/OSDebug.h>
-
+#include <i386/cpu_threads.h>
#include <machine/pal_routines.h>
extern void throttle_lowpri_io(int);
* Forward declarations
*/
static void user_page_fault_continue(kern_return_t kret);
-#ifdef __i386__
-static void panic_trap(x86_saved_state32_t *saved_state);
-static void set_recovery_ip(x86_saved_state32_t *saved_state, vm_offset_t ip);
-extern void panic_64(x86_saved_state_t *, int, const char *, boolean_t);
-#else
-static void panic_trap(x86_saved_state64_t *saved_state);
+static void panic_trap(x86_saved_state64_t *saved_state, uint32_t pl, kern_return_t fault_result);
static void set_recovery_ip(x86_saved_state64_t *saved_state, vm_offset_t ip);
-#endif
volatile perfCallback perfTrapHook = NULL; /* Pointer to CHUD trap hook routine */
extern boolean_t dtrace_tally_fault(user_addr_t);
#endif
+extern boolean_t pmap_smep_enabled;
+extern boolean_t pmap_smap_enabled;
+__attribute__((noreturn))
void
thread_syscall_return(
kern_return_t ret)
== (SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT);
if (kdebug_enable && is_mach) {
/* Mach trap */
- KERNEL_DEBUG_CONSTANT(
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC,code)|DBG_FUNC_END,
ret, 0, 0, 0, 0);
}
is_mach = (code < 0);
if (kdebug_enable && is_mach) {
/* Mach trap */
- KERNEL_DEBUG_CONSTANT(
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC,-code)|DBG_FUNC_END,
ret, 0, 0, 0, 0);
}
ret);
#endif
}
- throttle_lowpri_io(TRUE);
+ throttle_lowpri_io(1);
thread_exception_return();
/*NOTREACHED*/
}
-#if MACH_KDB
-boolean_t debug_all_traps_with_kdb = FALSE;
-extern struct db_watchpoint *db_watchpoint_list;
-extern boolean_t db_watchpoints_inserted;
-extern boolean_t db_breakpoints_inserted;
-
-void
-thread_kdb_return(void)
-{
- thread_t thr_act = current_thread();
- x86_saved_state_t *iss = USER_STATE(thr_act);
-
- pal_register_cache_state(thr_act, DIRTY);
-
- if (is_saved_state64(iss)) {
- x86_saved_state64_t *regs;
-
- regs = saved_state64(iss);
-
- if (kdb_trap(regs->isf.trapno, (int)regs->isf.err, (void *)regs)) {
- thread_exception_return();
- /*NOTREACHED*/
- }
-
- } else {
- x86_saved_state32_t *regs;
-
- regs = saved_state32(iss);
-
- if (kdb_trap(regs->trapno, regs->err, (void *)regs)) {
- thread_exception_return();
- /*NOTREACHED*/
- }
- }
-}
-
-#endif /* MACH_KDB */
-
static inline void
user_page_fault_continue(
kern_return_t kr)
thread_t thread = current_thread();
user_addr_t vaddr;
-#if MACH_KDB
- x86_saved_state_t *regs = USER_STATE(thread);
- int err;
- int trapno;
-
- assert((is_saved_state32(regs) && !thread_is_64bit(thread)) ||
- (is_saved_state64(regs) && thread_is_64bit(thread)));
-#endif
-
- if (thread_is_64bit(thread)) {
- x86_saved_state64_t *uregs;
+ if (thread_is_64bit(thread)) {
+ x86_saved_state64_t *uregs;
uregs = USER_REGS64(thread);
-#if MACH_KDB
- trapno = uregs->isf.trapno;
- err = (int)uregs->isf.err;
-#endif
vaddr = (user_addr_t)uregs->cr2;
} else {
x86_saved_state32_t *uregs;
uregs = USER_REGS32(thread);
-#if MACH_KDB
- trapno = uregs->trapno;
- err = uregs->err;
-#endif
vaddr = uregs->cr2;
}
- if (__probable((kr == KERN_SUCCESS) || (kr == KERN_ABORTED))) {
-#if MACH_KDB
- if (!db_breakpoints_inserted) {
- db_set_breakpoints();
- }
- if (db_watchpoint_list &&
- db_watchpoints_inserted &&
- (err & T_PF_WRITE) &&
- db_find_watchpoint(thread->map,
- (vm_offset_t)vaddr,
- saved_state32(regs)))
- kdb_trap(T_WATCHPOINT, 0, saved_state32(regs));
-#endif /* MACH_KDB */
- thread_exception_return();
- /*NOTREACHED*/
- }
-
-#if MACH_KDB
- if (debug_all_traps_with_kdb &&
- kdb_trap(trapno, err, saved_state32(regs))) {
- thread_exception_return();
- /*NOTREACHED*/
- }
-#endif /* MACH_KDB */
/* PAL debug hook */
pal_dbg_page_fault( thread, vaddr, kr );
kprintf(" r10 0x%llx\n", saved_state->r10);
kprintf(" r8 0x%llx\n", saved_state->r8);
kprintf(" r9 0x%llx\n", saved_state->r9);
- kprintf(" v_arg6 0x%llx\n", saved_state->v_arg6);
- kprintf(" v_arg7 0x%llx\n", saved_state->v_arg7);
- kprintf(" v_arg8 0x%llx\n", saved_state->v_arg8);
kprintf(" cr2 0x%llx\n", saved_state->cr2);
kprintf("real cr2 0x%lx\n", get_cr2());
snprintf(buf, bufsize, "0x%x 0x%x 0x%llx", tcpu, cpu_data_ptr[tcpu]->cpu_max_observed_int_latency_vector, cpu_data_ptr[tcpu]->cpu_max_observed_int_latency);
}
+uint32_t interrupt_timer_coalescing_enabled = 1;
+uint64_t interrupt_coalesced_timers;
+
/*
* Handle interrupts:
* - local APIC interrupts (IPIs, timers, etc) are handled by the kernel,
boolean_t user_mode = FALSE;
int ipl;
int cnum = cpu_number();
+ cpu_data_t *cdp = cpu_data_ptr[cnum];
+ int itype = 0;
if (is_saved_state64(state) == TRUE) {
x86_saved_state64_t *state64;
interrupt_num = state32->trapno;
}
- KERNEL_DEBUG_CONSTANT(
+ if (cpu_data_ptr[cnum]->lcpu.package->num_idle == topoParms.nLThreadsPerPackage)
+ cpu_data_ptr[cnum]->cpu_hwIntpexits[interrupt_num]++;
+
+ if (interrupt_num == (LAPIC_DEFAULT_INTERRUPT_BASE + LAPIC_INTERPROCESSOR_INTERRUPT))
+ itype = 1;
+ else if (interrupt_num == (LAPIC_DEFAULT_INTERRUPT_BASE + LAPIC_TIMER_INTERRUPT))
+ itype = 2;
+ else
+ itype = 3;
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_START,
- interrupt_num, rip, user_mode, 0, 0);
+ interrupt_num,
+ (user_mode ? rip : VM_KERNEL_UNSLIDE(rip)),
+ user_mode, itype, 0);
SCHED_STATS_INTERRUPT(current_processor());
- ipl = get_preemption_level();
+#if CONFIG_TELEMETRY
+ if (telemetry_needs_record) {
+ telemetry_mark_curthread(user_mode);
+ }
+#endif
+ ipl = get_preemption_level();
+
/*
* Handle local APIC interrupts
* else call platform expert for devices.
*/
- if (!lapic_interrupt(interrupt_num, state))
+ if (!lapic_interrupt(interrupt_num, state)) {
PE_incoming_interrupt(interrupt_num);
+ }
if (__improbable(get_preemption_level() != ipl)) {
panic("Preemption level altered by interrupt vector 0x%x: initial 0x%x, final: 0x%x\n", interrupt_num, ipl, get_preemption_level());
}
- KERNEL_DEBUG_CONSTANT(
- MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_END,
- interrupt_num, 0, 0, 0, 0);
- if (cpu_data_ptr[cnum]->cpu_nested_istack) {
- cpu_data_ptr[cnum]->cpu_nested_istack_events++;
+ if (__improbable(cdp->cpu_nested_istack)) {
+ cdp->cpu_nested_istack_events++;
}
else {
- uint64_t int_latency = mach_absolute_time() - cpu_data_ptr[cnum]->cpu_int_event_time;
- if (ilat_assert && (int_latency > interrupt_latency_cap) && !machine_timeout_suspended()) {
- panic("Interrupt vector 0x%x exceeded interrupt latency threshold, 0x%llx absolute time delta, prior signals: 0x%x, current signals: 0x%x", interrupt_num, int_latency, cpu_data_ptr[cnum]->cpu_prior_signals, cpu_data_ptr[cnum]->cpu_signals);
+ uint64_t ctime = mach_absolute_time();
+ uint64_t int_latency = ctime - cdp->cpu_int_event_time;
+ uint64_t esdeadline, ehdeadline;
+ /* Attempt to process deferred timers in the context of
+ * this interrupt, unless interrupt time has already exceeded
+ * TCOAL_ILAT_THRESHOLD.
+ */
+#define TCOAL_ILAT_THRESHOLD (30000ULL)
+
+ if ((int_latency < TCOAL_ILAT_THRESHOLD) &&
+ interrupt_timer_coalescing_enabled) {
+ esdeadline = cdp->rtclock_timer.queue.earliest_soft_deadline;
+ ehdeadline = cdp->rtclock_timer.deadline;
+ if ((ctime >= esdeadline) && (ctime < ehdeadline)) {
+ interrupt_coalesced_timers++;
+ TCOAL_DEBUG(0x88880000 | DBG_FUNC_START, ctime, esdeadline, ehdeadline, interrupt_coalesced_timers, 0);
+ rtclock_intr(state);
+ TCOAL_DEBUG(0x88880000 | DBG_FUNC_END, ctime, esdeadline, interrupt_coalesced_timers, 0, 0);
+ } else {
+ TCOAL_DEBUG(0x77770000, ctime, cdp->rtclock_timer.queue.earliest_soft_deadline, cdp->rtclock_timer.deadline, interrupt_coalesced_timers, 0);
+ }
}
- if (int_latency > cpu_data_ptr[cnum]->cpu_max_observed_int_latency) {
- cpu_data_ptr[cnum]->cpu_max_observed_int_latency = int_latency;
- cpu_data_ptr[cnum]->cpu_max_observed_int_latency_vector = interrupt_num;
+
+ if (__improbable(ilat_assert && (int_latency > interrupt_latency_cap) && !machine_timeout_suspended())) {
+ panic("Interrupt vector 0x%x exceeded interrupt latency threshold, 0x%llx absolute time delta, prior signals: 0x%x, current signals: 0x%x", interrupt_num, int_latency, cdp->cpu_prior_signals, cdp->cpu_signals);
+ }
+
+ if (__improbable(int_latency > cdp->cpu_max_observed_int_latency)) {
+ cdp->cpu_max_observed_int_latency = int_latency;
+ cdp->cpu_max_observed_int_latency_vector = interrupt_num;
}
}
* Having serviced the interrupt first, look at the interrupted stack depth.
*/
if (!user_mode) {
- uint64_t depth = cpu_data_ptr[cnum]->cpu_kernel_stack
+ uint64_t depth = cdp->cpu_kernel_stack
+ sizeof(struct x86_kernel_state)
+ sizeof(struct i386_exception_link *)
- rsp;
- if (depth > kernel_stack_depth_max) {
+ if (__improbable(depth > kernel_stack_depth_max)) {
kernel_stack_depth_max = (vm_offset_t)depth;
KERNEL_DEBUG_CONSTANT(
MACHDBG_CODE(DBG_MACH_SCHED, MACH_STACK_DEPTH),
- (long) depth, (long) rip, 0, 0, 0);
+ (long) depth, (long) VM_KERNEL_UNSLIDE(rip), 0, 0, 0);
}
}
+
+ if (cnum == master_cpu)
+ ml_entropy_collect();
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_END,
+ interrupt_num, 0, 0, 0, 0);
+
+ assert(ml_get_interrupts_enabled() == FALSE);
}
static inline void
x86_saved_state_t *state,
uintptr_t *lo_spp)
{
-#ifdef __i386__
- x86_saved_state32_t *saved_state;
-#else
x86_saved_state64_t *saved_state;
-#endif
int code;
user_addr_t vaddr;
int type;
vm_map_t map = 0; /* protected by T_PAGE_FAULT */
kern_return_t result = KERN_FAILURE;
+ kern_return_t fault_result = KERN_SUCCESS;
thread_t thread;
ast_t *myast;
boolean_t intr;
#if NCOPY_WINDOWS > 0
int fault_in_copy_window = -1;
#endif
- int is_user = 0;
-#if MACH_KDB
- pt_entry_t *pte;
-#endif /* MACH_KDB */
-
- thread = current_thread();
-
-#ifdef __i386__
- if (__improbable(is_saved_state64(state))) {
- panic_64(state, 0, "Kernel trap with 64-bit state", FALSE);
- }
-
- saved_state = saved_state32(state);
+ int is_user;
+ int trap_pl = get_preemption_level();
- /* Record cpu where state was captured (trampolines don't set this) */
- saved_state->cpu = cpu_number();
+ thread = current_thread();
- vaddr = (user_addr_t)saved_state->cr2;
- type = saved_state->trapno;
- code = saved_state->err & 0xffff;
- intr = (saved_state->efl & EFL_IF) != 0; /* state of ints at trap */
- kern_ip = (vm_offset_t)saved_state->eip;
-#else
if (__improbable(is_saved_state32(state)))
panic("kernel_trap(%p) with 32-bit state", state);
saved_state = saved_state64(state);
code = (int)(saved_state->isf.err & 0xffff);
intr = (saved_state->isf.rflags & EFL_IF) != 0; /* state of ints at trap */
kern_ip = (vm_offset_t)saved_state->isf.rip;
-#endif
myast = ast_pending();
+ is_user = (vaddr < VM_MAX_USER_PAGE_ADDRESS);
+
perfASTCallback astfn = perfASTHook;
if (__improbable(astfn != NULL)) {
if (*myast & AST_CHUD_ALL)
} else
*myast &= ~AST_CHUD_ALL;
- /*
- * Is there a hook?
- */
- perfCallback fn = perfTrapHook;
- if (__improbable(fn != NULL)) {
- if (fn(type, NULL, 0, 0) == KERN_SUCCESS) {
- /*
- * If it succeeds, we are done...
- */
- return;
- }
- }
#if CONFIG_DTRACE
+ /*
+ * Is there a DTrace hook?
+ */
if (__improbable(tempDTraceTrapHook != NULL)) {
if (tempDTraceTrapHook(type, state, lo_spp, 0) == KERN_SUCCESS) {
/*
if (__improbable(T_PREEMPT == type)) {
ast_taken(AST_PREEMPTION, FALSE);
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_EXCP_KTRAP_x86, type)) | DBG_FUNC_NONE,
- 0, 0, 0, kern_ip, 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_EXCP_KTRAP_x86, type)) | DBG_FUNC_NONE,
+ 0, 0, 0, VM_KERNEL_UNSLIDE(kern_ip), 0);
return;
}
-
+
+ user_addr_t kd_vaddr = is_user ? vaddr : VM_KERNEL_UNSLIDE(vaddr);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_EXCP_KTRAP_x86, type)) | DBG_FUNC_NONE,
+ (unsigned)(kd_vaddr >> 32), (unsigned)kd_vaddr, is_user,
+ VM_KERNEL_UNSLIDE(kern_ip), 0);
+
+
if (T_PAGE_FAULT == type) {
/*
* assume we're faulting in the kernel map
map = thread->map;
fault_in_copy_window = window_index;
}
- is_user = -1;
}
#else
if (__probable(vaddr < VM_MAX_USER_PAGE_ADDRESS)) {
/* fault occurred in userspace */
map = thread->map;
- is_user = -1;
+
+ /* Intercept a potential Supervisor Mode Execute
+ * Protection fault. These criteria identify
+ * both NX faults and SMEP faults, but both
+ * are fatal. We avoid checking PTEs (racy).
+ * (The VM could just redrive a SMEP fault, hence
+ * the intercept).
+ */
+ if (__improbable((code == (T_PF_PROT | T_PF_EXECUTE)) &&
+ (pmap_smep_enabled) && (saved_state->isf.rip == vaddr))) {
+ goto debugger_entry;
+ }
+
+ /*
+ * Additionally check for SMAP faults...
+ * which are characterized by page-present and
+ * the AC bit unset (i.e. not from copyin/out path).
+ */
+ if (__improbable(code & T_PF_PROT &&
+ pmap_smap_enabled &&
+ (saved_state->isf.rflags & EFL_AC) == 0)) {
+ goto debugger_entry;
+ }
/*
* If we're not sharing cr3 with the user
set_cr3_raw(map->pmap->pm_cr3);
return;
}
+ if (__improbable(vaddr < PAGE_SIZE) &&
+ ((thread->machine.specFlags & CopyIOActive) == 0)) {
+ goto debugger_entry;
+ }
}
#endif
}
}
- KERNEL_DEBUG_CONSTANT(
- (MACHDBG_CODE(DBG_MACH_EXCP_KTRAP_x86, type)) | DBG_FUNC_NONE,
- (unsigned)(vaddr >> 32), (unsigned)vaddr, is_user, kern_ip, 0);
-
-
(void) ml_set_interrupts_enabled(intr);
switch (type) {
fpSSEexterrflt();
return;
case T_DEBUG:
-#ifdef __i386__
- if ((saved_state->efl & EFL_TF) == 0 && NO_WATCHPOINTS)
-#else
if ((saved_state->isf.rflags & EFL_TF) == 0 && NO_WATCHPOINTS)
-#endif
{
/* We've somehow encountered a debug
* register match that does not belong
#endif
case T_PAGE_FAULT:
-#if MACH_KDB
- /*
- * Check for watchpoint on kernel static data.
- * vm_fault would fail in this case
- */
- if (map == kernel_map && db_watchpoint_list && db_watchpoints_inserted &&
- (code & T_PF_WRITE) && vaddr < vm_map_max(map) &&
- ((*(pte = pmap_pte(kernel_pmap, (vm_map_offset_t)vaddr))) & INTEL_PTE_WRITE) == 0) {
- pmap_store_pte(
- pte,
- *pte | INTEL_PTE_VALID | INTEL_PTE_WRITE);
- /* XXX need invltlb here? */
-
- result = KERN_SUCCESS;
- goto look_for_watchpoints;
- }
-#endif /* MACH_KDB */
-
#if CONFIG_DTRACE
if (thread != THREAD_NULL && thread->options & TH_OPT_DTRACE) { /* Executing under dtrace_probe? */
if (dtrace_tally_fault(vaddr)) { /* Should a fault under dtrace be ignored? */
}
}
#endif /* CONFIG_DTRACE */
-
prot = VM_PROT_READ;
if (code & T_PF_WRITE)
prot |= VM_PROT_WRITE;
-#if PAE
if (code & T_PF_EXECUTE)
prot |= VM_PROT_EXECUTE;
-#endif
- result = vm_fault(map,
- vm_map_trunc_page(vaddr),
+ fault_result = result = vm_fault(map,
+ vaddr,
prot,
FALSE,
THREAD_UNINT, NULL, 0);
-#if MACH_KDB
- if (result == KERN_SUCCESS) {
- /*
- * Look for watchpoints
- */
-look_for_watchpoints:
- if (map == kernel_map && db_watchpoint_list && db_watchpoints_inserted && (code & T_PF_WRITE) &&
- db_find_watchpoint(map, vaddr, saved_state))
- kdb_trap(T_WATCHPOINT, 0, saved_state);
- }
-#endif /* MACH_KDB */
-
if (result == KERN_SUCCESS) {
#if NCOPY_WINDOWS > 0
if (fault_in_copy_window != -1) {
* access through the debugger.
*/
sync_iss_to_iks(state);
-#if MACH_KDB
-restart_debugger:
-#endif /* MACH_KDB */
#if MACH_KDP
- if (current_debugger != KDB_CUR_DB) {
- if (kdp_i386_trap(type, saved_state, result, (vm_offset_t)vaddr))
- return;
- } else {
-#endif /* MACH_KDP */
-#if MACH_KDB
- if (kdb_trap(type, code, saved_state)) {
- if (switch_debugger) {
- current_debugger = KDP_CUR_DB;
- switch_debugger = 0;
- goto restart_debugger;
- }
- return;
- }
-#endif /* MACH_KDB */
-#if MACH_KDP
- }
+ if (kdp_i386_trap(type, saved_state, result, (vm_offset_t)vaddr))
+ return;
#endif
}
- __asm__ volatile("cli":::"cc");
- panic_trap(saved_state);
+ pal_cli();
+ panic_trap(saved_state, trap_pl, fault_result);
/*
* NO RETURN
*/
}
-#ifdef __i386__
-static void
-set_recovery_ip(x86_saved_state32_t *saved_state, vm_offset_t ip)
-{
- saved_state->eip = ip;
-}
-#else
static void
set_recovery_ip(x86_saved_state64_t *saved_state, vm_offset_t ip)
{
saved_state->isf.rip = ip;
}
-#endif
-
-
-#ifdef __i386__
-static void
-panic_trap(x86_saved_state32_t *regs)
-{
- const char *trapname = "Unknown";
- pal_cr_t cr0, cr2, cr3, cr4;
-
- pal_get_control_registers( &cr0, &cr2, &cr3, &cr4 );
-
- /*
- * Issue an I/O port read if one has been requested - this is an
- * event logic analyzers can use as a trigger point.
- */
- panic_io_port_read();
-
- kprintf("panic trap number 0x%x, eip 0x%x\n", regs->trapno, regs->eip);
- kprintf("cr0 0x%08x cr2 0x%08x cr3 0x%08x cr4 0x%08x\n",
- cr0, cr2, cr3, cr4);
-
- if (regs->trapno < TRAP_TYPES)
- trapname = trap_type[regs->trapno];
-#undef panic
- panic("Kernel trap at 0x%08x, type %d=%s, registers:\n"
- "CR0: 0x%08x, CR2: 0x%08x, CR3: 0x%08x, CR4: 0x%08x\n"
- "EAX: 0x%08x, EBX: 0x%08x, ECX: 0x%08x, EDX: 0x%08x\n"
- "CR2: 0x%08x, EBP: 0x%08x, ESI: 0x%08x, EDI: 0x%08x\n"
- "EFL: 0x%08x, EIP: 0x%08x, CS: 0x%08x, DS: 0x%08x\n"
- "Error code: 0x%08x\n",
- regs->eip, regs->trapno, trapname, cr0, cr2, cr3, cr4,
- regs->eax,regs->ebx,regs->ecx,regs->edx,
- regs->cr2,regs->ebp,regs->esi,regs->edi,
- regs->efl,regs->eip,regs->cs & 0xFFFF, regs->ds & 0xFFFF, regs->err);
- /*
- * This next statement is not executed,
- * but it's needed to stop the compiler using tail call optimization
- * for the panic call - which confuses the subsequent backtrace.
- */
- cr0 = 0;
-}
-#else
-
static void
-panic_trap(x86_saved_state64_t *regs)
+panic_trap(x86_saved_state64_t *regs, uint32_t pl, kern_return_t fault_result)
{
const char *trapname = "Unknown";
pal_cr_t cr0, cr2, cr3, cr4;
+ boolean_t potential_smep_fault = FALSE, potential_kernel_NX_fault = FALSE;
+ boolean_t potential_smap_fault = FALSE;
pal_get_control_registers( &cr0, &cr2, &cr3, &cr4 );
assert(ml_get_interrupts_enabled() == FALSE);
if (regs->isf.trapno < TRAP_TYPES)
trapname = trap_type[regs->isf.trapno];
+ if ((regs->isf.trapno == T_PAGE_FAULT) && (regs->isf.err == (T_PF_PROT | T_PF_EXECUTE)) && (regs->isf.rip == regs->cr2)) {
+ if (pmap_smep_enabled && (regs->isf.rip < VM_MAX_USER_PAGE_ADDRESS)) {
+ potential_smep_fault = TRUE;
+ } else if (regs->isf.rip >= VM_MIN_KERNEL_AND_KEXT_ADDRESS) {
+ potential_kernel_NX_fault = TRUE;
+ }
+ } else if (pmap_smap_enabled &&
+ regs->isf.trapno == T_PAGE_FAULT &&
+ regs->isf.err & T_PF_PROT &&
+ regs->cr2 < VM_MAX_USER_PAGE_ADDRESS &&
+ regs->isf.rip >= VM_MIN_KERNEL_AND_KEXT_ADDRESS) {
+ potential_smap_fault = TRUE;
+ }
+
#undef panic
panic("Kernel trap at 0x%016llx, type %d=%s, registers:\n"
"CR0: 0x%016llx, CR2: 0x%016llx, CR3: 0x%016llx, CR4: 0x%016llx\n"
"R8: 0x%016llx, R9: 0x%016llx, R10: 0x%016llx, R11: 0x%016llx\n"
"R12: 0x%016llx, R13: 0x%016llx, R14: 0x%016llx, R15: 0x%016llx\n"
"RFL: 0x%016llx, RIP: 0x%016llx, CS: 0x%016llx, SS: 0x%016llx\n"
- "CR2: 0x%016llx, Error code: 0x%016llx, Faulting CPU: 0x%x%s\n",
+ "Fault CR2: 0x%016llx, Error code: 0x%016llx, Fault CPU: 0x%x%s%s%s%s, PL: %d, VF: %d\n",
regs->isf.rip, regs->isf.trapno, trapname,
cr0, cr2, cr3, cr4,
regs->rax, regs->rbx, regs->rcx, regs->rdx,
regs->r12, regs->r13, regs->r14, regs->r15,
regs->isf.rflags, regs->isf.rip, regs->isf.cs & 0xFFFF,
regs->isf.ss & 0xFFFF,regs->cr2, regs->isf.err, regs->isf.cpu,
- "");
+ virtualized ? " VMM" : "",
+ potential_kernel_NX_fault ? " Kernel NX fault" : "",
+ potential_smep_fault ? " SMEP/User NX fault" : "",
+ potential_smap_fault ? " SMAP fault" : "",
+ pl,
+ fault_result);
/*
* This next statement is not executed,
* but it's needed to stop the compiler using tail call optimization
*/
cr0 = 0;
}
-#endif
#if CONFIG_DTRACE
extern kern_return_t dtrace_user_probe(x86_saved_state_t *);
pal_sti();
- KERNEL_DEBUG_CONSTANT(
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
(MACHDBG_CODE(DBG_MACH_EXCP_UTRAP_x86, type)) | DBG_FUNC_NONE,
(unsigned)(vaddr>>32), (unsigned)vaddr,
(unsigned)(rip>>32), (unsigned)rip, 0);
return; /* If it succeeds, we are done... */
}
+#if CONFIG_DTRACE
/*
* DTrace does not consume all user traps, only INT_3's for now.
* Avoid needlessly calling tempDTraceTrapHook here, and let the
* INT_3 case handle them.
*/
+#endif
+
DEBUG_KPRINT_SYSCALL_MASK(1,
"user_trap: type=0x%x(%s) err=0x%x cr2=%p rip=%p\n",
type, trap_type[type], err, (void *)(long) vaddr, (void *)(long) rip);
break;
case T_PAGE_FAULT:
- prot = VM_PROT_READ;
+ {
+ prot = VM_PROT_READ;
if (err & T_PF_WRITE)
prot |= VM_PROT_WRITE;
-#if PAE
if (__improbable(err & T_PF_EXECUTE))
prot |= VM_PROT_EXECUTE;
-#endif
- kret = vm_fault(thread->map, vm_map_trunc_page(vaddr),
- prot, FALSE,
- THREAD_ABORTSAFE, NULL, 0);
+ kret = vm_fault(thread->map,
+ vaddr,
+ prot, FALSE,
+ THREAD_ABORTSAFE, NULL, 0);
+
+ if (__probable((kret == KERN_SUCCESS) || (kret == KERN_ABORTED))) {
+ thread_exception_return();
+ /*NOTREACHED*/
+ }
user_page_fault_continue(kret);
-
- /* NOTREACHED */
+ } /* NOTREACHED */
break;
case T_SSE_FLOAT_ERROR:
break;
default:
-#if MACH_KGDB
- Debugger("Unanticipated user trap");
- return;
-#endif /* MACH_KGDB */
-#if MACH_KDB
- if (kdb_trap(type, err, saved_state32(saved_state)))
- return;
-#endif /* MACH_KDB */
panic("Unexpected user trap, type %d", type);
return;
}
}
-#if MACH_KDB
-
-extern void db_i386_state(x86_saved_state32_t *regs);
-
-#include <ddb/db_output.h>
-
-void
-db_i386_state(
- x86_saved_state32_t *regs)
-{
- db_printf("eip %8x\n", regs->eip);
- db_printf("trap %8x\n", regs->trapno);
- db_printf("err %8x\n", regs->err);
- db_printf("efl %8x\n", regs->efl);
- db_printf("ebp %8x\n", regs->ebp);
- db_printf("esp %8x\n", regs->cr2);
- db_printf("uesp %8x\n", regs->uesp);
- db_printf("cs %8x\n", regs->cs & 0xff);
- db_printf("ds %8x\n", regs->ds & 0xff);
- db_printf("es %8x\n", regs->es & 0xff);
- db_printf("fs %8x\n", regs->fs & 0xff);
- db_printf("gs %8x\n", regs->gs & 0xff);
- db_printf("ss %8x\n", regs->ss & 0xff);
- db_printf("eax %8x\n", regs->eax);
- db_printf("ebx %8x\n", regs->ebx);
- db_printf("ecx %8x\n", regs->ecx);
- db_printf("edx %8x\n", regs->edx);
- db_printf("esi %8x\n", regs->esi);
- db_printf("edi %8x\n", regs->edi);
-}
-
-#endif /* MACH_KDB */
-
-/* Synchronize a thread's i386_kernel_state (if any) with the given
- * i386_saved_state_t obtained from the trap/IPI handler; called in
+/* Synchronize a thread's x86_kernel_state (if any) with the given
+ * x86_saved_state_t obtained from the trap/IPI handler; called in
* kernel_trap() prior to entering the debugger, and when receiving
- * an "MP_KDP" IPI.
+ * an "MP_KDP" IPI. Called with null saved_state if an incoming IPI
+ * was detected from the kernel while spinning with interrupts masked.
*/
void
boolean_t record_active_regs = FALSE;
/* The PAL may have a special way to sync registers */
- if( saved_state->flavor == THREAD_STATE_NONE )
+ if (saved_state && saved_state->flavor == THREAD_STATE_NONE)
pal_get_kern_regs( saved_state );
if ((kstack = current_thread()->kernel_stack) != 0) {
-#ifdef __i386__
- x86_saved_state32_t *regs = saved_state32(saved_state);
-#else
x86_saved_state64_t *regs = saved_state64(saved_state);
-#endif
iks = STACK_IKS(kstack);
/* Did we take the trap/interrupt in kernel mode? */
-#ifdef __i386__
- if (regs == USER_REGS32(current_thread()))
- record_active_regs = TRUE;
- else {
- iks->k_ebx = regs->ebx;
- iks->k_esp = (int)regs;
- iks->k_ebp = regs->ebp;
- iks->k_edi = regs->edi;
- iks->k_esi = regs->esi;
- iks->k_eip = regs->eip;
- }
-#else
- if (regs == USER_REGS64(current_thread()))
+ if (saved_state == NULL || /* NULL => polling in kernel */
+ regs == USER_REGS64(current_thread()))
record_active_regs = TRUE;
else {
iks->k_rbx = regs->rbx;
iks->k_r15 = regs->r15;
iks->k_rip = regs->isf.rip;
}
-#endif
}
if (record_active_regs == TRUE) {
-#ifdef __i386__
- /* Show the trap handler path */
- __asm__ volatile("movl %%ebx, %0" : "=m" (iks->k_ebx));
- __asm__ volatile("movl %%esp, %0" : "=m" (iks->k_esp));
- __asm__ volatile("movl %%ebp, %0" : "=m" (iks->k_ebp));
- __asm__ volatile("movl %%edi, %0" : "=m" (iks->k_edi));
- __asm__ volatile("movl %%esi, %0" : "=m" (iks->k_esi));
- /* "Current" instruction pointer */
- __asm__ volatile("movl $1f, %0\n1:" : "=m" (iks->k_eip));
-#else
/* Show the trap handler path */
__asm__ volatile("movq %%rbx, %0" : "=m" (iks->k_rbx));
__asm__ volatile("movq %%rsp, %0" : "=m" (iks->k_rsp));
: "=m" (iks->k_rip)
:
: "rax");
-#endif
}
}
if ((kstack = current_thread()->kernel_stack) != 0) {
iks = STACK_IKS(kstack);
-#ifdef __i386__
- /* Display the trap handler path */
- __asm__ volatile("movl %%ebx, %0" : "=m" (iks->k_ebx));
- __asm__ volatile("movl %%esp, %0" : "=m" (iks->k_esp));
- __asm__ volatile("movl %%ebp, %0" : "=m" (iks->k_ebp));
- __asm__ volatile("movl %%edi, %0" : "=m" (iks->k_edi));
- __asm__ volatile("movl %%esi, %0" : "=m" (iks->k_esi));
- /* "Current" instruction pointer */
- __asm__ volatile("movl $1f, %0\n1:" : "=m" (iks->k_eip));
-#else
/* Display the trap handler path */
__asm__ volatile("movq %%rbx, %0" : "=m" (iks->k_rbx));
__asm__ volatile("movq %%rsp, %0" : "=m" (iks->k_rsp));
__asm__ volatile("movq %%r15, %0" : "=m" (iks->k_r15));
/* "Current" instruction pointer */
__asm__ volatile("leaq 1f(%%rip), %%rax; mov %%rax, %0\n1:" : "=m" (iks->k_rip)::"rax");
-#endif
}
}
+
+#if DEBUG
+extern void thread_exception_return_internal(void) __dead2;
+
+void thread_exception_return(void) {
+ thread_t thread = current_thread();
+ ml_set_interrupts_enabled(FALSE);
+ if (thread_is_64bit(thread) != task_has_64BitAddr(thread->task)) {
+ panic("Task/thread bitness mismatch %p %p, task: %d, thread: %d", thread, thread->task, thread_is_64bit(thread), task_has_64BitAddr(thread->task));
+ }
+
+ if (thread_is_64bit(thread)) {
+ if ((gdt_desc_p(USER64_CS)->access & ACC_PL_U) == 0) {
+ panic("64-GDT mismatch %p, descriptor: %p", thread, gdt_desc_p(USER64_CS));
+ }
+ } else {
+ if ((gdt_desc_p(USER_CS)->access & ACC_PL_U) == 0) {
+ panic("32-GDT mismatch %p, descriptor: %p", thread, gdt_desc_p(USER_CS));
+
+ }
+ }
+ thread_exception_return_internal();
+}
+#endif
projects / apple / xnu.git / blobdiff