X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/7ddcb079202367355dddccdfa4318e57d50318be..cb3231590a3c94ab4375e2228bd5e86b0cf1ad7e:/osfmk/i386/trap.c diff --git a/osfmk/i386/trap.c b/osfmk/i386/trap.c index a07b1b8cb..bfc24c4aa 100644 --- a/osfmk/i386/trap.c +++ b/osfmk/i386/trap.c @@ -1,8 +1,8 @@ /* - * Copyright (c) 2000-2010 Apple Inc. All rights reserved. + * Copyright (c) 2000-2018 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ - * + * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in @@ -11,10 +11,10 @@ * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. - * + * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. - * + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -22,46 +22,44 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * + * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* -* @OSF_COPYRIGHT@ -*/ -/* -* Mach Operating System -* Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University -* All Rights Reserved. -* -* Permission to use, copy, modify and distribute this software and its -* documentation is hereby granted, provided that both the copyright -* notice and this permission notice appear in all copies of the -* software, derivative works or modified versions, and any portions -* thereof, and that both notices appear in supporting documentation. -* -* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" -* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR -* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. -* -* Carnegie Mellon requests users of this software to return to -* -* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU -* School of Computer Science -* Carnegie Mellon University -* Pittsburgh PA 15213-3890 -* -* any improvements or extensions that they make and grant Carnegie Mellon -* the rights to redistribute these changes. -*/ + * @OSF_COPYRIGHT@ + */ +/* + * Mach Operating System + * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ /* -*/ + */ /* -* Hardware trap/fault handler. + * Hardware trap/fault handler. */ -#include -#include #include #include @@ -91,20 +89,12 @@ #include #include #include - +#if CONFIG_TELEMETRY +#include +#endif #include - -#if MACH_KGDB -#include -#endif /* MACH_KGDB */ - -#if MACH_KDB -#include -#include -#include -#include -#include -#endif /* MACH_KDB */ +#include +#include #include @@ -117,7 +107,7 @@ #include #include - +#include #include extern void throttle_lowpri_io(int); @@ -127,16 +117,8 @@ extern void kprint_state(x86_saved_state64_t *saved_state); * 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) __dead2; 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 */ #if CONFIG_DTRACE /* See */ @@ -145,174 +127,107 @@ perfCallback tempDTraceTrapHook = NULL; /* Pointer to DTrace fbt trap hook routi 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) + kern_return_t ret) { - thread_t thr_act = current_thread(); - boolean_t is_mach; - int code; + thread_t thr_act = current_thread(); + boolean_t is_mach; + int code; pal_register_cache_state(thr_act, DIRTY); - if (thread_is_64bit(thr_act)) { - x86_saved_state64_t *regs; - + if (thread_is_64bit_addr(thr_act)) { + x86_saved_state64_t *regs; + regs = USER_REGS64(thr_act); code = (int) (regs->rax & SYSCALL_NUMBER_MASK); is_mach = (regs->rax & SYSCALL_CLASS_MASK) - == (SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT); + == (SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT); if (kdebug_enable && is_mach) { - /* Mach trap */ - KERNEL_DEBUG_CONSTANT( - MACHDBG_CODE(DBG_MACH_EXCP_SC,code)|DBG_FUNC_END, - ret, 0, 0, 0, 0); + /* Mach trap */ + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_EXCP_SC, code) | DBG_FUNC_END, + ret, 0, 0, 0, 0); } regs->rax = ret; #if DEBUG - if (is_mach) + if (is_mach) { DEBUG_KPRINT_SYSCALL_MACH( "thread_syscall_return: 64-bit mach ret=%u\n", ret); - else + } else { DEBUG_KPRINT_SYSCALL_UNIX( "thread_syscall_return: 64-bit unix ret=%u\n", ret); + } #endif } else { - x86_saved_state32_t *regs; - + x86_saved_state32_t *regs; + regs = USER_REGS32(thr_act); code = ((int) regs->eax); is_mach = (code < 0); if (kdebug_enable && is_mach) { - /* Mach trap */ - KERNEL_DEBUG_CONSTANT( - MACHDBG_CODE(DBG_MACH_EXCP_SC,-code)|DBG_FUNC_END, - ret, 0, 0, 0, 0); + /* Mach trap */ + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_EXCP_SC, -code) | DBG_FUNC_END, + ret, 0, 0, 0, 0); } regs->eax = ret; #if DEBUG - if (is_mach) + if (is_mach) { DEBUG_KPRINT_SYSCALL_MACH( "thread_syscall_return: 32-bit mach ret=%u\n", ret); - else + } else { DEBUG_KPRINT_SYSCALL_UNIX( "thread_syscall_return: 32-bit unix ret=%u\n", ret); + } #endif } - throttle_lowpri_io(TRUE); - - 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 DEBUG || DEVELOPMENT + kern_allocation_name_t + prior __assert_only = thread_get_kernel_state(thr_act)->allocation_name; + assertf(prior == NULL, "thread_set_allocation_name(\"%s\") not cleared", kern_allocation_get_name(prior)); +#endif /* DEBUG || DEVELOPMENT */ - 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); + throttle_lowpri_io(1); - if (kdb_trap(regs->trapno, regs->err, (void *)regs)) { - thread_exception_return(); - /*NOTREACHED*/ - } - } + thread_exception_return(); + /*NOTREACHED*/ } -#endif /* MACH_KDB */ static inline void user_page_fault_continue( - kern_return_t kr) + 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; + thread_t thread = current_thread(); + user_addr_t vaddr; - 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_addr(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; + 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 ); @@ -325,36 +240,33 @@ user_page_fault_continue( * Fault recovery in copyin/copyout routines. */ struct recovery { - uintptr_t fault_addr; - uintptr_t recover_addr; + uintptr_t fault_addr; + uintptr_t recover_addr; }; -extern struct recovery recover_table[]; -extern struct recovery recover_table_end[]; +extern struct recovery recover_table[]; +extern struct recovery recover_table_end[]; -const char * trap_type[] = {TRAP_NAMES}; -unsigned TRAP_TYPES = sizeof(trap_type)/sizeof(trap_type[0]); +const char * trap_type[] = {TRAP_NAMES}; +unsigned TRAP_TYPES = sizeof(trap_type) / sizeof(trap_type[0]); -extern void PE_incoming_interrupt(int interrupt); +extern void PE_incoming_interrupt(int interrupt); #if defined(__x86_64__) && DEBUG void -kprint_state(x86_saved_state64_t *saved_state) +kprint_state(x86_saved_state64_t *saved_state) { kprintf("current_cpu_datap() 0x%lx\n", (uintptr_t)current_cpu_datap()); kprintf("Current GS base MSR 0x%llx\n", rdmsr64(MSR_IA32_GS_BASE)); kprintf("Kernel GS base MSR 0x%llx\n", rdmsr64(MSR_IA32_KERNEL_GS_BASE)); kprintf("state at 0x%lx:\n", (uintptr_t) saved_state); - kprintf(" rdi 0x%llx\n", saved_state->rdi); - kprintf(" rsi 0x%llx\n", saved_state->rsi); + kprintf(" rdi 0x%llx\n", saved_state->rdi); + kprintf(" rsi 0x%llx\n", saved_state->rsi); kprintf(" rdx 0x%llx\n", saved_state->rdx); 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(" r9 0x%llx\n", saved_state->r9); kprintf(" cr2 0x%llx\n", saved_state->cr2); kprintf("real cr2 0x%lx\n", get_cr2()); @@ -388,12 +300,13 @@ kprint_state(x86_saved_state64_t *saved_state) * Non-zero indicates latency assert is enabled and capped at valued * absolute time units. */ - + uint64_t interrupt_latency_cap = 0; boolean_t ilat_assert = FALSE; void -interrupt_latency_tracker_setup(void) { +interrupt_latency_tracker_setup(void) +{ uint32_t ilat_cap_us; if (PE_parse_boot_argn("interrupt_latency_cap_us", &ilat_cap_us, sizeof(ilat_cap_us))) { interrupt_latency_cap = ilat_cap_us * NSEC_PER_USEC; @@ -404,7 +317,9 @@ interrupt_latency_tracker_setup(void) { PE_parse_boot_argn("-interrupt_latency_assert_enable", &ilat_assert, sizeof(ilat_assert)); } -void interrupt_reset_latency_stats(void) { +void +interrupt_reset_latency_stats(void) +{ uint32_t i; for (i = 0; i < real_ncpus; i++) { cpu_data_ptr[i]->cpu_max_observed_int_latency = @@ -412,7 +327,9 @@ void interrupt_reset_latency_stats(void) { } } -void interrupt_populate_latency_stats(char *buf, unsigned bufsize) { +void +interrupt_populate_latency_stats(char *buf, unsigned bufsize) +{ uint32_t i, tcpu = ~0; uint64_t cur_max = 0; @@ -423,10 +340,14 @@ void interrupt_populate_latency_stats(char *buf, unsigned bufsize) { } } - if (tcpu < real_ncpus) + if (tcpu < real_ncpus) { 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, @@ -435,69 +356,111 @@ void interrupt_populate_latency_stats(char *buf, unsigned bufsize) { void interrupt(x86_saved_state_t *state) { - uint64_t rip; - uint64_t rsp; - int interrupt_num; - boolean_t user_mode = FALSE; - int ipl; - int cnum = cpu_number(); - - if (is_saved_state64(state) == TRUE) { - x86_saved_state64_t *state64; - - state64 = saved_state64(state); - rip = state64->isf.rip; - rsp = state64->isf.rsp; - interrupt_num = state64->isf.trapno; -#ifdef __x86_64__ - if(state64->isf.cs & 0x03) -#endif - user_mode = TRUE; + uint64_t rip; + uint64_t rsp; + int interrupt_num; + boolean_t user_mode = FALSE; + int ipl; + int cnum = cpu_number(); + cpu_data_t *cdp = cpu_data_ptr[cnum]; + int itype = DBG_INTR_TYPE_UNKNOWN; + int handled; + + x86_saved_state64_t *state64 = saved_state64(state); + rip = state64->isf.rip; + rsp = state64->isf.rsp; + interrupt_num = state64->isf.trapno; + if (state64->isf.cs & 0x03) { + user_mode = TRUE; + } + + 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 = DBG_INTR_TYPE_IPI; + } else if (interrupt_num == (LAPIC_DEFAULT_INTERRUPT_BASE + LAPIC_TIMER_INTERRUPT)) { + itype = DBG_INTR_TYPE_TIMER; } else { - x86_saved_state32_t *state32; - - state32 = saved_state32(state); - if (state32->cs & 0x03) - user_mode = TRUE; - rip = state32->eip; - rsp = state32->uesp; - interrupt_num = state32->trapno; + itype = DBG_INTR_TYPE_OTHER; } - KERNEL_DEBUG_CONSTANT( - MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_START, - interrupt_num, rip, user_mode, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_START, + interrupt_num, + (user_mode ? rip : VM_KERNEL_UNSLIDE(rip)), + user_mode, itype, 0); SCHED_STATS_INTERRUPT(current_processor()); +#if CONFIG_TELEMETRY + if (telemetry_needs_record) { + telemetry_mark_curthread(user_mode, FALSE); + } +#endif + ipl = get_preemption_level(); /* * Handle local APIC interrupts * else call platform expert for devices. */ - if (!lapic_interrupt(interrupt_num, state)) - PE_incoming_interrupt(interrupt_num); + handled = lapic_interrupt(interrupt_num, state); + + if (!handled) { + if (interrupt_num == (LAPIC_DEFAULT_INTERRUPT_BASE + LAPIC_CMCI_INTERRUPT)) { + /* + * CMCI can be signalled on any logical processor, and the kexts + * that implement handling CMCI use IOKit to register handlers for + * the CMCI vector, so if we see a CMCI, do not encode a CPU + * number in bits 8:31 (since the vector is the same regardless of + * the handling CPU). + */ + PE_incoming_interrupt(interrupt_num); + } else if (cnum <= lapic_max_interrupt_cpunum) { + PE_incoming_interrupt((cnum << 8) | 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++; - } - 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); + + if (__improbable(cdp->cpu_nested_istack)) { + cdp->cpu_nested_istack_events++; + } else { + 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 (__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 (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(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; } } @@ -505,24 +468,37 @@ interrupt(x86_saved_state_t *state) * Having serviced the interrupt first, look at the interrupted stack depth. */ if (!user_mode) { - uint64_t depth = cpu_data_ptr[cnum]->cpu_kernel_stack - + sizeof(struct x86_kernel_state) - + sizeof(struct i386_exception_link *) - - rsp; - if (depth > kernel_stack_depth_max) { + uint64_t depth = cdp->cpu_kernel_stack + + sizeof(struct thread_kernel_state) + + sizeof(struct i386_exception_link *) + - rsp; + 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(); + } + +#if KPERF + kperf_interrupt(); +#endif /* KPERF */ + + KDBG_RELEASE(MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_END, + interrupt_num); + + assert(ml_get_interrupts_enabled() == FALSE); } static inline void reset_dr7(void) { long dr7 = 0x400; /* magic dr7 reset value; 32 bit on i386, 64 bit on x86_64 */ - __asm__ volatile("mov %0,%%dr7" : : "r" (dr7)); + __asm__ volatile ("mov %0,%%dr7" : : "r" (dr7)); } #if MACH_KDP unsigned kdp_has_active_watchpoints = 0; @@ -538,53 +514,32 @@ unsigned kdp_has_active_watchpoints = 0; void kernel_trap( - x86_saved_state_t *state, + 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; - thread_t thread; - ast_t *myast; + x86_saved_state64_t *saved_state; + 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; boolean_t intr; - vm_prot_t prot; - struct recovery *rp; - vm_offset_t kern_ip; + vm_prot_t prot; + struct recovery *rp; + vm_offset_t kern_ip; #if NCOPY_WINDOWS > 0 - int fault_in_copy_window = -1; + 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))) + if (__improbable(is_saved_state32(state))) { panic("kernel_trap(%p) with 32-bit state", state); + } saved_state = saved_state64(state); /* Record cpu where state was captured */ @@ -593,33 +548,15 @@ kernel_trap( vaddr = (user_addr_t)saved_state->cr2; type = saved_state->isf.trapno; code = (int)(saved_state->isf.err & 0xffff); - intr = (saved_state->isf.rflags & EFL_IF) != 0; /* state of ints at trap */ + 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(); - perfASTCallback astfn = perfASTHook; - if (__improbable(astfn != NULL)) { - if (*myast & AST_CHUD_ALL) - astfn(AST_CHUD_ALL, myast); - } else - *myast &= ~AST_CHUD_ALL; + is_user = (vaddr < VM_MAX_USER_PAGE_ADDRESS); +#if CONFIG_DTRACE /* - * Is there a hook? + * Is there a DTrace 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 if (__improbable(tempDTraceTrapHook != NULL)) { if (tempDTraceTrapHook(type, state, lo_spp, 0) == KERN_SUCCESS) { /* @@ -636,13 +573,21 @@ kernel_trap( * as soon we possibly can to hold latency down */ if (__improbable(T_PREEMPT == type)) { - ast_taken(AST_PREEMPTION, FALSE); + ast_taken_kernel(); - 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 @@ -651,9 +596,9 @@ kernel_trap( if (__probable(thread != THREAD_NULL && thread->map != kernel_map)) { #if NCOPY_WINDOWS > 0 - vm_offset_t copy_window_base; - vm_offset_t kvaddr; - int window_index; + vm_offset_t copy_window_base; + vm_offset_t kvaddr; + int window_index; kvaddr = (vm_offset_t)vaddr; /* @@ -665,25 +610,44 @@ kernel_trap( */ copy_window_base = current_cpu_datap()->cpu_copywindow_base; - if (kvaddr >= copy_window_base && kvaddr < (copy_window_base + (NBPDE * NCOPY_WINDOWS)) ) { - + if (kvaddr >= copy_window_base && kvaddr < (copy_window_base + (NBPDE * NCOPY_WINDOWS))) { window_index = (int)((kvaddr - copy_window_base) / NBPDE); if (thread->machine.copy_window[window_index].user_base != (user_addr_t)-1) { - - kvaddr -= (copy_window_base + (NBPDE * window_index)); - vaddr = thread->machine.copy_window[window_index].user_base + kvaddr; + kvaddr -= (copy_window_base + (NBPDE * window_index)); + vaddr = thread->machine.copy_window[window_index].user_base + kvaddr; 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 @@ -691,128 +655,93 @@ kernel_trap( * then switch cr3 here and dismiss the fault. */ if (no_shared_cr3 && - (thread->machine.specFlags&CopyIOActive) && + (thread->machine.specFlags & CopyIOActive) && map->pmap->pm_cr3 != get_cr3_base()) { pmap_assert(current_cpu_datap()->cpu_pmap_pcid_enabled == FALSE); 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) { - - case T_NO_FPU: + case T_NO_FPU: fpnoextflt(); return; - case T_FPU_FAULT: + case T_FPU_FAULT: fpextovrflt(); return; - case T_FLOATING_POINT_ERROR: + case T_FLOATING_POINT_ERROR: fpexterrflt(); return; - case T_SSE_FLOAT_ERROR: - fpSSEexterrflt(); + case T_SSE_FLOAT_ERROR: + 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 - * to the kernel debugger. - * This isn't supposed to happen. - */ - reset_dr7(); - return; - } - goto debugger_entry; -#ifdef __x86_64__ - case T_INT3: - goto debugger_entry; -#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; + case T_INVALID_OPCODE: + fpUDflt(kern_ip); + goto debugger_entry; + + case T_DEBUG: + if ((saved_state->isf.rflags & EFL_TF) == 0 && NO_WATCHPOINTS) { + /* We've somehow encountered a debug + * register match that does not belong + * to the kernel debugger. + * This isn't supposed to happen. + */ + reset_dr7(); + return; } -#endif /* MACH_KDB */ + goto debugger_entry; + case T_INT3: + goto debugger_entry; + case T_PAGE_FAULT: #if CONFIG_DTRACE - if (thread != THREAD_NULL && thread->options & TH_OPT_DTRACE) { /* Executing under dtrace_probe? */ + if (thread != THREAD_NULL && thread->t_dtrace_inprobe) { /* Executing under dtrace_probe? */ if (dtrace_tally_fault(vaddr)) { /* Should a fault under dtrace be ignored? */ /* * DTrace has "anticipated" the possibility of this fault, and has * established the suitable recovery state. Drop down now into the - * recovery handling code in "case T_GENERAL_PROTECTION:". + * recovery handling code in "case T_GENERAL_PROTECTION:". */ goto FALL_THROUGH; } } #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), - 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); + if (code & T_PF_WRITE) { + prot |= VM_PROT_WRITE; + } + if (code & T_PF_EXECUTE) { + prot |= VM_PROT_EXECUTE; } -#endif /* MACH_KDB */ + + fault_result = result = vm_fault(map, + vaddr, + prot, + FALSE, VM_KERN_MEMORY_NONE, + THREAD_UNINT, NULL, 0); if (result == KERN_SUCCESS) { #if NCOPY_WINDOWS > 0 if (fault_in_copy_window != -1) { ml_set_interrupts_enabled(FALSE); copy_window_fault(thread, map, - fault_in_copy_window); + fault_in_copy_window); (void) ml_set_interrupts_enabled(intr); } #endif /* NCOPY_WINDOWS > 0 */ @@ -825,14 +754,14 @@ look_for_watchpoints: FALL_THROUGH: #endif /* CONFIG_DTRACE */ - case T_GENERAL_PROTECTION: + case T_GENERAL_PROTECTION: /* * If there is a failure recovery address * for this fault, go there. */ - for (rp = recover_table; rp < recover_table_end; rp++) { - if (kern_ip == rp->fault_addr) { - set_recovery_ip(saved_state, rp->recover_addr); + for (rp = recover_table; rp < recover_table_end; rp++) { + if (kern_ip == rp->fault_addr) { + set_recovery_ip(saved_state, rp->recover_addr); return; } } @@ -845,19 +774,19 @@ FALL_THROUGH: thread->recover = 0; return; } - /* - * Unanticipated page-fault errors in kernel - * should not happen. - * - * fall through... - */ - default: + /* + * Unanticipated page-fault errors in kernel + * should not happen. + * + * fall through... + */ + default: /* * Exception 15 is reserved but some chips may generate it * spuriously. Seen at startup on AMD Athlon-64. */ - if (type == 15) { - kprintf("kernel_trap() ignoring spurious trap 15\n"); + if (type == 15) { + kprintf("kernel_trap() ignoring spurious trap 15\n"); return; } debugger_entry: @@ -867,99 +796,32 @@ debugger_entry: * 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; + saved_state->isf.rip = ip; } -#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; + 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); @@ -970,45 +832,63 @@ panic_trap(x86_saved_state64_t *regs) */ panic_io_port_read(); - kprintf("panic trap number 0x%x, rip 0x%016llx\n", - regs->isf.trapno, regs->isf.rip); + kprintf("CPU %d panic trap number 0x%x, rip 0x%016llx\n", + cpu_number(), regs->isf.trapno, regs->isf.rip); kprintf("cr0 0x%016llx cr2 0x%016llx cr3 0x%016llx cr4 0x%016llx\n", - cr0, cr2, cr3, cr4); + cr0, cr2, cr3, cr4); - if (regs->isf.trapno < TRAP_TYPES) - trapname = trap_type[regs->isf.trapno]; + 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" - "RAX: 0x%016llx, RBX: 0x%016llx, RCX: 0x%016llx, RDX: 0x%016llx\n" - "RSP: 0x%016llx, RBP: 0x%016llx, RSI: 0x%016llx, RDI: 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", - regs->isf.rip, regs->isf.trapno, trapname, - cr0, cr2, cr3, cr4, - regs->rax, regs->rbx, regs->rcx, regs->rdx, - regs->isf.rsp, regs->rbp, regs->rsi, regs->rdi, - regs->r8, regs->r9, regs->r10, regs->r11, - 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, - ""); - /* - * 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; + "CR0: 0x%016llx, CR2: 0x%016llx, CR3: 0x%016llx, CR4: 0x%016llx\n" + "RAX: 0x%016llx, RBX: 0x%016llx, RCX: 0x%016llx, RDX: 0x%016llx\n" + "RSP: 0x%016llx, RBP: 0x%016llx, RSI: 0x%016llx, RDI: 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" + "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->isf.rsp, regs->rbp, regs->rsi, regs->rdi, + regs->r8, regs->r9, regs->r10, regs->r11, + 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); } -#endif #if CONFIG_DTRACE extern kern_return_t dtrace_user_probe(x86_saved_state_t *); #endif +#if DEBUG +uint32_t fsigs[2]; +uint32_t fsigns, fsigcs; +#endif + /* * Trap from user mode. */ @@ -1016,24 +896,23 @@ void user_trap( x86_saved_state_t *saved_state) { - int exc; - int err; - mach_exception_code_t code; + int exc; + int err; + mach_exception_code_t code; mach_exception_subcode_t subcode; - int type; - user_addr_t vaddr; - vm_prot_t prot; - thread_t thread = current_thread(); - ast_t *myast; - kern_return_t kret; - user_addr_t rip; - unsigned long dr6 = 0; /* 32 bit for i386, 64 bit for x86_64 */ - - assert((is_saved_state32(saved_state) && !thread_is_64bit(thread)) || - (is_saved_state64(saved_state) && thread_is_64bit(thread))); + int type; + user_addr_t vaddr; + vm_prot_t prot; + thread_t thread = current_thread(); + kern_return_t kret; + user_addr_t rip; + unsigned long dr6 = 0; /* 32 bit for i386, 64 bit for x86_64 */ + + assert((is_saved_state32(saved_state) && !thread_is_64bit_addr(thread)) || + (is_saved_state64(saved_state) && thread_is_64bit_addr(thread))); if (is_saved_state64(saved_state)) { - x86_saved_state64_t *regs; + x86_saved_state64_t *regs; regs = saved_state64(saved_state); @@ -1045,7 +924,7 @@ user_trap( vaddr = (user_addr_t)regs->cr2; rip = (user_addr_t)regs->isf.rip; } else { - x86_saved_state32_t *regs; + x86_saved_state32_t *regs; regs = saved_state32(saved_state); @@ -1063,135 +942,121 @@ user_trap( /* Stash and clear this processor's DR6 value, in the event * this was a debug register match */ - __asm__ volatile ("mov %%db6, %0" : "=r" (dr6)); + __asm__ volatile ("mov %%db6, %0" : "=r" (dr6)); __asm__ volatile ("mov %0, %%db6" : : "r" (clear)); } pal_sti(); - KERNEL_DEBUG_CONSTANT( - (MACHDBG_CODE(DBG_MACH_EXCP_UTRAP_x86, type)) | DBG_FUNC_NONE, - (unsigned)(vaddr>>32), (unsigned)vaddr, - (unsigned)(rip>>32), (unsigned)rip, 0); + 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); code = 0; subcode = 0; exc = 0; -#if DEBUG_TRACE - kprintf("user_trap(0x%08x) type=%d vaddr=0x%016llx\n", - saved_state, type, vaddr); -#endif - - perfASTCallback astfn = perfASTHook; - if (__improbable(astfn != NULL)) { - myast = ast_pending(); - if (*myast & AST_CHUD_ALL) { - astfn(AST_CHUD_ALL, myast); - } - } - - /* Is there a hook? */ - perfCallback fn = perfTrapHook; - if (__improbable(fn != NULL)) { - if (fn(type, saved_state, 0, 0) == KERN_SUCCESS) - 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); - - switch (type) { + "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); - case T_DIVIDE_ERROR: + switch (type) { + case T_DIVIDE_ERROR: exc = EXC_ARITHMETIC; code = EXC_I386_DIV; break; - case T_DEBUG: - { - pcb_t pcb; + case T_DEBUG: + { + pcb_t pcb; + /* + * Update the PCB with this processor's DR6 value + * in the event this was a debug register match. + */ + pcb = THREAD_TO_PCB(thread); + if (pcb->ids) { /* - * Update the PCB with this processor's DR6 value - * in the event this was a debug register match. + * We can get and set the status register + * in 32-bit mode even on a 64-bit thread + * because the high order bits are not + * used on x86_64 */ - pcb = THREAD_TO_PCB(thread); - if (pcb->ids) { - /* - * We can get and set the status register - * in 32-bit mode even on a 64-bit thread - * because the high order bits are not - * used on x86_64 - */ - if (thread_is_64bit(thread)) { - x86_debug_state64_t *ids = pcb->ids; - ids->dr6 = dr6; - } else { /* 32 bit thread */ - x86_debug_state32_t *ids = pcb->ids; - ids->dr6 = (uint32_t) dr6; - } + if (thread_is_64bit_addr(thread)) { + x86_debug_state64_t *ids = pcb->ids; + ids->dr6 = dr6; + } else { /* 32 bit thread */ + x86_debug_state32_t *ids = pcb->ids; + ids->dr6 = (uint32_t) dr6; } - exc = EXC_BREAKPOINT; - code = EXC_I386_SGL; - break; } - case T_INT3: + exc = EXC_BREAKPOINT; + code = EXC_I386_SGL; + break; + } + case T_INT3: #if CONFIG_DTRACE - if (dtrace_user_probe(saved_state) == KERN_SUCCESS) + if (dtrace_user_probe(saved_state) == KERN_SUCCESS) { return; /* If it succeeds, we are done... */ + } #endif exc = EXC_BREAKPOINT; code = EXC_I386_BPT; break; - case T_OVERFLOW: + case T_OVERFLOW: exc = EXC_ARITHMETIC; code = EXC_I386_INTO; break; - case T_OUT_OF_BOUNDS: + case T_OUT_OF_BOUNDS: exc = EXC_SOFTWARE; code = EXC_I386_BOUND; break; - case T_INVALID_OPCODE: + case T_INVALID_OPCODE: +#if !defined(RC_HIDE_XNU_J137) + fpUDflt(rip); /* May return from exception directly */ +#endif exc = EXC_BAD_INSTRUCTION; code = EXC_I386_INVOP; break; - case T_NO_FPU: + case T_NO_FPU: fpnoextflt(); return; - case T_FPU_FAULT: + case T_FPU_FAULT: fpextovrflt(); /* Propagates exception directly, doesn't return */ return; - case T_INVALID_TSS: /* invalid TSS == iret with NT flag set */ + case T_INVALID_TSS: /* invalid TSS == iret with NT flag set */ exc = EXC_BAD_INSTRUCTION; code = EXC_I386_INVTSSFLT; subcode = err; break; - case T_SEGMENT_NOT_PRESENT: + case T_SEGMENT_NOT_PRESENT: exc = EXC_BAD_INSTRUCTION; code = EXC_I386_SEGNPFLT; subcode = err; break; - case T_STACK_FAULT: + case T_STACK_FAULT: exc = EXC_BAD_INSTRUCTION; code = EXC_I386_STKFLT; subcode = err; break; - case T_GENERAL_PROTECTION: + case T_GENERAL_PROTECTION: /* * There's a wide range of circumstances which generate this * class of exception. From user-space, many involve bad @@ -1205,43 +1070,80 @@ user_trap( * to EXC_BAD_ACCESS (and thence SIGSEGV) also - rather than * EXC_BAD_INSTRUCTION which is more accurate. We just can't * win! - */ + */ exc = EXC_BAD_ACCESS; code = EXC_I386_GPFLT; subcode = err; break; - case T_PAGE_FAULT: + case T_PAGE_FAULT: + { 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; + if (err & T_PF_WRITE) { + prot |= VM_PROT_WRITE; + } + if (__improbable(err & T_PF_EXECUTE)) { + prot |= VM_PROT_EXECUTE; + } +#if DEVELOPMENT || DEBUG + uint32_t fsig = 0; + fsig = thread_fpsimd_hash(thread); +#if DEBUG + fsigs[0] = fsig; #endif - kret = vm_fault(thread->map, vm_map_trunc_page(vaddr), - prot, FALSE, - THREAD_ABORTSAFE, NULL, 0); +#endif + kret = vm_fault(thread->map, + vaddr, + prot, FALSE, VM_KERN_MEMORY_NONE, + THREAD_ABORTSAFE, NULL, 0); +#if DEVELOPMENT || DEBUG + if (fsig) { + uint32_t fsig2 = thread_fpsimd_hash(thread); +#if DEBUG + fsigcs++; + fsigs[1] = fsig2; +#endif + if (fsig != fsig2) { + panic("FP/SIMD state hash mismatch across fault thread: %p 0x%x->0x%x", thread, fsig, fsig2); + } + } else { +#if DEBUG + fsigns++; +#endif + } +#endif + if (__probable((kret == KERN_SUCCESS) || (kret == KERN_ABORTED))) { + thread_exception_return(); + /*NOTREACHED*/ + } - user_page_fault_continue(kret); - - /* NOTREACHED */ - break; + /* + * For a user trap, vm_fault() should never return KERN_FAILURE. + * If it does, we're leaking preemption disables somewhere in the kernel. + */ + if (__improbable(kret == KERN_FAILURE)) { + panic("vm_fault() KERN_FAILURE from user fault on thread %p", thread); + } + + user_page_fault_continue(kret); + } /* NOTREACHED */ + break; - case T_SSE_FLOAT_ERROR: + case T_SSE_FLOAT_ERROR: fpSSEexterrflt(); /* Propagates exception directly, doesn't return */ return; - case T_FLOATING_POINT_ERROR: + case T_FLOATING_POINT_ERROR: fpexterrflt(); /* Propagates exception directly, doesn't return */ return; - case T_DTRACE_RET: + case T_DTRACE_RET: #if CONFIG_DTRACE - if (dtrace_user_probe(saved_state) == KERN_SUCCESS) + if (dtrace_user_probe(saved_state) == KERN_SUCCESS) { return; /* If it succeeds, we are done... */ + } #endif /* * If we get an INT 0x7f when we do not expect to, @@ -1251,17 +1153,8 @@ user_trap( code = EXC_I386_INVOP; 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 */ + default: panic("Unexpected user trap, type %d", type); - return; } /* Note: Codepaths that directly return from user_trap() have pending * ASTs processed in locore @@ -1270,29 +1163,6 @@ user_trap( /* NOTREACHED */ } - -/* - * Handle AST traps for i386. - */ - -extern void log_thread_action (thread_t, char *); - -void -i386_astintr(int preemption) -{ - ast_t mask = AST_ALL; - spl_t s; - - if (preemption) - mask = AST_PREEMPTION; - - s = splsched(); - - ast_taken(mask, s); - - splx(s); -} - /* * Handle exceptions for i386. * @@ -1305,96 +1175,51 @@ i386_astintr(int preemption) */ void i386_exception( - int exc, + int exc, mach_exception_code_t code, mach_exception_subcode_t subcode) { mach_exception_data_type_t codes[EXCEPTION_CODE_MAX]; DEBUG_KPRINT_SYSCALL_MACH("i386_exception: exc=%d code=0x%llx subcode=0x%llx\n", - exc, code, subcode); - codes[0] = code; /* new exception interface */ + exc, code, subcode); + codes[0] = code; /* new exception interface */ codes[1] = subcode; exception_triage(exc, codes, 2); /*NOTREACHED*/ } -#if MACH_KDB - -extern void db_i386_state(x86_saved_state32_t *regs); - -#include - -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 sync_iss_to_iks(x86_saved_state_t *saved_state) { - struct x86_kernel_state *iks; + struct x86_kernel_state *iks = NULL; vm_offset_t kstack; 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 + if (current_thread() != NULL && + (kstack = current_thread()->kernel_stack) != 0) { + x86_saved_state64_t *regs = saved_state64(saved_state); 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())) - record_active_regs = TRUE; - else { + 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_rsp = regs->isf.rsp; iks->k_rbp = regs->rbp; @@ -1404,34 +1229,22 @@ sync_iss_to_iks(x86_saved_state_t *saved_state) 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)); + __asm__ volatile ("movq %%rbx, %0" : "=m" (iks->k_rbx)); + __asm__ volatile ("movq %%rsp, %0" : "=m" (iks->k_rsp)); + __asm__ volatile ("movq %%rbp, %0" : "=m" (iks->k_rbp)); + __asm__ volatile ("movq %%r12, %0" : "=m" (iks->k_r12)); + __asm__ volatile ("movq %%r13, %0" : "=m" (iks->k_r13)); + __asm__ volatile ("movq %%r14, %0" : "=m" (iks->k_r14)); + __asm__ volatile ("movq %%r15, %0" : "=m" (iks->k_r15)); /* "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)); - __asm__ volatile("movq %%rbp, %0" : "=m" (iks->k_rbp)); - __asm__ volatile("movq %%r12, %0" : "=m" (iks->k_r12)); - __asm__ volatile("movq %%r13, %0" : "=m" (iks->k_r13)); - __asm__ volatile("movq %%r14, %0" : "=m" (iks->k_r14)); - __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 + __asm__ volatile ("leaq 1f(%%rip), %%rax; mov %%rax, %0\n1:" + : "=m" (iks->k_rip) + : + : "rax"); } } @@ -1442,32 +1255,52 @@ sync_iss_to_iks(x86_saved_state_t *saved_state) * or user space. */ void -sync_iss_to_iks_unconditionally(__unused x86_saved_state_t *saved_state) { +sync_iss_to_iks_unconditionally(__unused x86_saved_state_t *saved_state) +{ struct x86_kernel_state *iks; vm_offset_t kstack; 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)); + __asm__ volatile ("movq %%rbx, %0" : "=m" (iks->k_rbx)); + __asm__ volatile ("movq %%rsp, %0" : "=m" (iks->k_rsp)); + __asm__ volatile ("movq %%rbp, %0" : "=m" (iks->k_rbp)); + __asm__ volatile ("movq %%r12, %0" : "=m" (iks->k_r12)); + __asm__ volatile ("movq %%r13, %0" : "=m" (iks->k_r13)); + __asm__ volatile ("movq %%r14, %0" : "=m" (iks->k_r14)); + __asm__ volatile ("movq %%r15, %0" : "=m" (iks->k_r15)); /* "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 %%rbp, %0" : "=m" (iks->k_rbp)); - __asm__ volatile("movq %%r12, %0" : "=m" (iks->k_r12)); - __asm__ volatile("movq %%r13, %0" : "=m" (iks->k_r13)); - __asm__ volatile("movq %%r14, %0" : "=m" (iks->k_r14)); - __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"); + __asm__ volatile ("leaq 1f(%%rip), %%rax; mov %%rax, %0\n1:" : "=m" (iks->k_rip)::"rax"); + } +} + +#if DEBUG +#define TERI 1 #endif + +#if TERI +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_addr(thread) != task_has_64Bit_addr(thread->task)) { + panic("Task/thread bitness mismatch %p %p, task: %d, thread: %d", thread, thread->task, thread_is_64bit_addr(thread), task_has_64Bit_addr(thread->task)); + } + + if (thread_is_64bit_addr(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)); + } } + assert(get_preemption_level() == 0); + thread_exception_return_internal(); } +#endif