/* $NetBSD: trap.c,v 1.96 2017/04/24 17:03:43 chs Exp $ */ /*- * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * the University of Utah, and William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)trap.c 7.4 (Berkeley) 5/13/91 */ /* * 386 Trap and System call handling */ #include __KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.96 2017/04/24 17:03:43 chs Exp $"); #include "opt_ddb.h" #include "opt_kgdb.h" #include "opt_xen.h" #include "opt_dtrace.h" #include "opt_compat_netbsd.h" #include "opt_compat_netbsd32.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef COMPAT_NETBSD32 #include #include #endif #include #include #include #include #include #include #include #include #ifndef XEN #include "isa.h" #endif #include #ifdef KDTRACE_HOOKS #include /* * This is a hook which is initialized by the dtrace module * to handle traps which might occur during DTrace probe * execution. */ dtrace_trap_func_t dtrace_trap_func = NULL; dtrace_doubletrap_func_t dtrace_doubletrap_func = NULL; #endif void trap(struct trapframe *); void trap_return_fault_return(struct trapframe *) __dead; const char * const trap_type[] = { "privileged instruction fault", /* 0 T_PRIVINFLT */ "breakpoint trap", /* 1 T_BPTFLT */ "arithmetic trap", /* 2 T_ARITHTRAP */ "asynchronous system trap", /* 3 T_ASTFLT */ "protection fault", /* 4 T_PROTFLT */ "trace trap", /* 5 T_TRCTRAP */ "page fault", /* 6 T_PAGEFLT */ "alignment fault", /* 7 T_ALIGNFLT */ "integer divide fault", /* 8 T_DIVIDE */ "non-maskable interrupt", /* 9 T_NMI */ "overflow trap", /* 10 T_OFLOW */ "bounds check fault", /* 11 T_BOUND */ "FPU not available fault", /* 12 T_DNA */ "double fault", /* 13 T_DOUBLEFLT */ "FPU operand fetch fault", /* 14 T_FPOPFLT */ "invalid TSS fault", /* 15 T_TSSFLT */ "segment not present fault", /* 16 T_SEGNPFLT */ "stack fault", /* 17 T_STKFLT */ "machine check fault", /* 18 T_MCA */ "SSE FP exception", /* 19 T_XMM */ "reserved trap", /* 20 T_RESERVED */ }; int trap_types = __arraycount(trap_type); #ifdef DEBUG int trapdebug = 0; #endif #define IDTVEC(name) __CONCAT(X, name) #ifdef TRAP_SIGDEBUG static void frame_dump(struct trapframe *, struct pcb *); #endif static void * onfault_handler(const struct pcb *pcb, const struct trapframe *tf) { struct onfault_table { uintptr_t start; uintptr_t end; void *handler; }; extern const struct onfault_table onfault_table[]; const struct onfault_table *p; uintptr_t pc; if (pcb->pcb_onfault != NULL) { return pcb->pcb_onfault; } pc = tf->tf_rip; for (p = onfault_table; p->start; p++) { if (p->start <= pc && pc < p->end) { return p->handler; } } return NULL; } static void trap_print(const struct trapframe *frame, const lwp_t *l) { const int type = frame->tf_trapno; if (frame->tf_trapno < trap_types) { printf("fatal %s", trap_type[type]); } else { printf("unknown trap %d", type); } printf(" in %s mode\n", (type & T_USER) ? "user" : "supervisor"); printf("trap type %d code %#lx rip %#lx cs %#lx rflags %#lx cr2 %#lx " "ilevel %#x rsp %#lx\n", type, frame->tf_err, (u_long)frame->tf_rip, frame->tf_cs, frame->tf_rflags, rcr2(), curcpu()->ci_ilevel, frame->tf_rsp); printf("curlwp %p pid %d.%d lowest kstack %p\n", l, l->l_proc->p_pid, l->l_lid, KSTACK_LOWEST_ADDR(l)); } /* * trap(frame): exception, fault, and trap interface to BSD kernel. * * This common code is called from assembly language IDT gate entry routines * that prepare a suitable stack frame, and restore this frame after the * exception has been processed. Note that the effect is as if the arguments * were passed call by reference. * * Note that the fpu traps (07 T_DNA, 10 T_ARITHTRAP and 13 T_XMM) * jump directly into the code in x86/fpu.c so they get processed * without interrupts being enabled. */ void trap(struct trapframe *frame) { struct lwp *l = curlwp; struct proc *p; struct pcb *pcb; extern char fusuintrfailure[], kcopy_fault[]; extern char IDTVEC(osyscall)[]; extern char IDTVEC(syscall32)[]; #ifndef XEN struct trapframe *vframe; #endif ksiginfo_t ksi; void *onfault; int type, error; uint64_t cr2; bool pfail; if (__predict_true(l != NULL)) { pcb = lwp_getpcb(l); p = l->l_proc; } else { /* * this can happen eg. on break points in early on boot. */ pcb = NULL; p = NULL; } type = frame->tf_trapno; #ifdef DEBUG if (trapdebug) { trap_print(frame, l); } #endif if (type != T_NMI && !KERNELMODE(frame->tf_cs, frame->tf_rflags)) { type |= T_USER; l->l_md.md_regs = frame; LWP_CACHE_CREDS(l, p); } #ifdef KDTRACE_HOOKS /* * A trap can occur while DTrace executes a probe. Before * executing the probe, DTrace blocks re-scheduling and sets * a flag in its per-cpu flags to indicate that it doesn't * want to fault. On returning from the the probe, the no-fault * flag is cleared and finally re-scheduling is enabled. * * If the DTrace kernel module has registered a trap handler, * call it and if it returns non-zero, assume that it has * handled the trap and modified the trap frame so that this * function can return normally. */ if ((type == T_PROTFLT || type == T_PAGEFLT) && dtrace_trap_func != NULL) { if ((*dtrace_trap_func)(frame, type)) { return; } } #endif switch (type) { default: we_re_toast: trap_print(frame, l); if (kdb_trap(type, 0, frame)) return; if (kgdb_trap(type, frame)) return; /* * If this is a breakpoint, don't panic if we're not connected. */ if (type == T_BPTFLT && kgdb_disconnected()) { printf("kgdb: ignored %s\n", trap_type[type]); return; } panic("trap"); /*NOTREACHED*/ case T_PROTFLT: case T_SEGNPFLT: case T_ALIGNFLT: case T_STKFLT: case T_TSSFLT: if (p == NULL) goto we_re_toast; /* Check for copyin/copyout fault. */ onfault = onfault_handler(pcb, frame); if (onfault != NULL) { copyefault: error = EFAULT; copyfault: frame->tf_rip = (uintptr_t)onfault; frame->tf_rax = error; return; } /* * Check for failure during return to user mode. * This can happen loading invalid values into the segment * registers, or during the 'iret' itself. * * We do this by looking at the instruction we faulted on. * The specific instructions we recognize only happen when * returning from a trap, syscall, or interrupt. */ kernelfault: #ifdef XEN /* * XXX: there has to be an equivalent 'problem' * but I (dsl) don't know exactly what happens! * For now panic the kernel. */ goto we_re_toast; #else KSI_INIT_TRAP(&ksi); ksi.ksi_signo = SIGSEGV; ksi.ksi_code = SEGV_ACCERR; ksi.ksi_trap = type; /* Get %rsp value before fault - there may be a pad word * below the trap frame. */ vframe = (void *)frame->tf_rsp; if (frame->tf_rip == 0) { /* * Assume that if we jumped to null we * probably did it via a null function * pointer, so print the return address. */ printf("kernel jumped to null; return addr was %p\n", *(void **)frame->tf_rsp); goto we_re_toast; } switch (*(uint16_t *)frame->tf_rip) { case 0xcf48: /* iretq */ /* * The 'iretq' instruction faulted, so we have the * 'user' registers saved after the kernel * %rip:%cs:%fl:%rsp:%ss of the iret, and below that * the user %rip:%cs:%fl:%rsp:%ss the 'iret' was * processing. * We must copy the user register back over the * kernel fault frame to generate a normal stack * frame (eg for sending a SIGSEGV). */ vframe = (void *)((char *)vframe - offsetof(struct trapframe, tf_rip)); memmove(vframe, frame, offsetof(struct trapframe, tf_rip)); /* Set the faulting address to the user %eip */ ksi.ksi_addr = (void *)vframe->tf_rip; break; case 0x848e: /* mov 0xa8(%rsp),%es (8e 84 24 a8 00 00 00) */ case 0x9c8e: /* mov 0xb0(%rsp),%ds (8e 9c 24 b0 00 00 00) */ #ifdef USER_LDT case 0xa48e: /* mov 0xa0(%rsp),%fs (8e a4 24 a0 00 00 00) */ case 0xac8e: /* mov 0x98(%rsp),%gs (8e ac 24 98 00 00 00) */ #endif /* * We faulted loading one of the user segment registers. * The stack frame containing the user registers is * still valid and pointed to by tf_rsp. * Maybe we should check the iretq follows. */ if (KERNELMODE(vframe->tf_cs, vframe->tf_eflags)) goto we_re_toast; /* There is no valid address for the fault */ break; default: goto we_re_toast; } /* XXX: worry about on-stack trampolines for nested * handlers?? */ /* Save outer frame for any signal return */ l->l_md.md_regs = vframe; (*p->p_emul->e_trapsignal)(l, &ksi); /* Return to user by reloading the user frame */ trap_return_fault_return(vframe); /* NOTREACHED */ #endif case T_PROTFLT|T_USER: /* protection fault */ #if defined(COMPAT_NETBSD32) && defined(COMPAT_10) { static const char lcall[7] = { 0x9a, 0, 0, 0, 0, 7, 0 }; const size_t sz = sizeof(lcall); char tmp[sz]; /* Check for the oosyscall lcall instruction. */ if (p->p_emul == &emul_netbsd32 && frame->tf_rip < VM_MAXUSER_ADDRESS32 - sz && copyin((void *)frame->tf_rip, tmp, sz) == 0 && memcmp(tmp, lcall, sz) == 0) { /* Advance past the lcall. */ frame->tf_rip += sz; /* Do the syscall. */ p->p_md.md_syscall(frame); goto out; } } #endif case T_TSSFLT|T_USER: case T_SEGNPFLT|T_USER: case T_STKFLT|T_USER: case T_ALIGNFLT|T_USER: #ifdef TRAP_SIGDEBUG printf("pid %d.%d (%s): BUS/SEGV (%#x) at rip %#lx addr %#lx\n", p->p_pid, l->l_lid, p->p_comm, type, frame->tf_rip, rcr2()); frame_dump(frame, pcb); #endif KSI_INIT_TRAP(&ksi); ksi.ksi_trap = type & ~T_USER; ksi.ksi_addr = (void *)rcr2(); switch (type) { case T_SEGNPFLT|T_USER: case T_STKFLT|T_USER: ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_ADRERR; break; case T_TSSFLT|T_USER: ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_OBJERR; break; case T_ALIGNFLT|T_USER: ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_ADRALN; break; case T_PROTFLT|T_USER: ksi.ksi_signo = SIGSEGV; ksi.ksi_code = SEGV_ACCERR; break; default: KASSERT(0); break; } goto trapsignal; case T_PRIVINFLT|T_USER: /* privileged instruction fault */ case T_FPOPFLT|T_USER: /* coprocessor operand fault */ #ifdef TRAP_SIGDEBUG printf("pid %d.%d (%s): ILL at rip %#lx addr %#lx\n", p->p_pid, l->l_lid, p->p_comm, frame->tf_rip, rcr2()); frame_dump(frame, pcb); #endif KSI_INIT_TRAP(&ksi); ksi.ksi_signo = SIGILL; ksi.ksi_trap = type & ~T_USER; ksi.ksi_addr = (void *) frame->tf_rip; switch (type) { case T_PRIVINFLT|T_USER: ksi.ksi_code = ILL_PRVOPC; break; case T_FPOPFLT|T_USER: ksi.ksi_code = ILL_COPROC; break; default: KASSERT(0); break; } goto trapsignal; case T_ASTFLT|T_USER: /* Allow process switch. */ //curcpu()->ci_data.cpu_nast++; if (l->l_pflag & LP_OWEUPC) { l->l_pflag &= ~LP_OWEUPC; ADDUPROF(l); } /* Allow a forced task switch. */ if (curcpu()->ci_want_resched) { preempt(); } goto out; case T_BOUND|T_USER: case T_OFLOW|T_USER: case T_DIVIDE|T_USER: KSI_INIT_TRAP(&ksi); ksi.ksi_signo = SIGFPE; ksi.ksi_trap = type & ~T_USER; ksi.ksi_addr = (void *)frame->tf_rip; switch (type) { case T_BOUND|T_USER: ksi.ksi_code = FPE_FLTSUB; break; case T_OFLOW|T_USER: ksi.ksi_code = FPE_INTOVF; break; case T_DIVIDE|T_USER: ksi.ksi_code = FPE_INTDIV; break; default: #ifdef DIAGNOSTIC panic("unhandled type %x\n", type); #endif break; } goto trapsignal; case T_PAGEFLT: /* Allow page faults in kernel mode. */ if (__predict_false(l == NULL)) goto we_re_toast; /* * fusuintrfailure is used by [fs]uswintr() to prevent * page faulting from inside the profiling interrupt. */ onfault = pcb->pcb_onfault; if (onfault == fusuintrfailure) { goto copyefault; } if (cpu_intr_p() || (l->l_pflag & LP_INTR) != 0) { goto we_re_toast; } cr2 = rcr2(); if (frame->tf_err & PGEX_X) { /* SMEP might have brought us here */ if (cr2 > VM_MIN_ADDRESS && cr2 <= VM_MAXUSER_ADDRESS) panic("prevented execution of %p (SMEP)", (void *)cr2); } goto faultcommon; case T_PAGEFLT|T_USER: { /* page fault */ register vaddr_t va; register struct vmspace *vm; register struct vm_map *map; vm_prot_t ftype; extern struct vm_map *kernel_map; cr2 = rcr2(); if (p->p_emul->e_usertrap != NULL && (*p->p_emul->e_usertrap)(l, cr2, frame) != 0) return; faultcommon: vm = p->p_vmspace; if (__predict_false(vm == NULL)) { goto we_re_toast; } pcb->pcb_cr2 = cr2; va = trunc_page((vaddr_t)cr2); /* * It is only a kernel address space fault iff: * 1. (type & T_USER) == 0 and * 2. pcb_onfault not set or * 3. pcb_onfault set but supervisor space fault * The last can occur during an exec() copyin where the * argument space is lazy-allocated. */ if (type == T_PAGEFLT && va >= VM_MIN_KERNEL_ADDRESS) map = kernel_map; else map = &vm->vm_map; if (frame->tf_err & PGEX_W) ftype = VM_PROT_WRITE; else if (frame->tf_err & PGEX_X) ftype = VM_PROT_EXECUTE; else ftype = VM_PROT_READ; #ifdef DIAGNOSTIC if (map == kernel_map && va == 0) { printf("trap: bad kernel access at %lx\n", va); goto we_re_toast; } #endif /* Fault the original page in. */ onfault = pcb->pcb_onfault; pcb->pcb_onfault = NULL; error = uvm_fault(map, va, ftype); pcb->pcb_onfault = onfault; if (error == 0) { if (map != kernel_map && (void *)va >= vm->vm_maxsaddr) uvm_grow(p, va); pfail = false; while (type == T_PAGEFLT) { /* * we need to switch pmap now if we're in * the middle of copyin/out. * * but we don't need to do so for kcopy as * it never touch userspace. */ kpreempt_disable(); if (curcpu()->ci_want_pmapload) { onfault = onfault_handler(pcb, frame); if (onfault != kcopy_fault) { pmap_load(); } } /* * We need to keep the pmap loaded and * so avoid being preempted until back * into the copy functions. Disable * interrupts at the hardware level before * re-enabling preemption. Interrupts * will be re-enabled by 'iret' when * returning back out of the trap stub. * They'll only be re-enabled when the * program counter is once again in * the copy functions, and so visible * to cpu_kpreempt_exit(). */ #ifndef XEN x86_disable_intr(); #endif l->l_nopreempt--; if (l->l_nopreempt > 0 || !l->l_dopreempt || pfail) { return; } #ifndef XEN x86_enable_intr(); #endif /* * If preemption fails for some reason, * don't retry it. The conditions won't * change under our nose. */ pfail = kpreempt(0); } goto out; } if (type == T_PAGEFLT) { onfault = onfault_handler(pcb, frame); if (onfault != NULL) goto copyfault; printf("uvm_fault(%p, 0x%lx, %d) -> %x\n", map, va, ftype, error); goto kernelfault; } KSI_INIT_TRAP(&ksi); ksi.ksi_trap = type & ~T_USER; ksi.ksi_addr = (void *)cr2; switch (error) { case EINVAL: ksi.ksi_signo = SIGBUS; ksi.ksi_code = BUS_ADRERR; break; case EACCES: ksi.ksi_signo = SIGSEGV; ksi.ksi_code = SEGV_ACCERR; error = EFAULT; break; case ENOMEM: ksi.ksi_signo = SIGKILL; printf("UVM: pid %d.%d (%s), uid %d killed: " "out of swap\n", p->p_pid, l->l_lid, p->p_comm, l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1); break; default: ksi.ksi_signo = SIGSEGV; ksi.ksi_code = SEGV_MAPERR; break; } #ifdef TRAP_SIGDEBUG printf("pid %d.%d (%s): signal %d at rip %#lx addr %#lx " "error %d trap %d cr2 %p\n", p->p_pid, l->l_lid, p->p_comm, ksi.ksi_signo, frame->tf_rip, va, error, ksi.ksi_trap, ksi.ksi_addr); frame_dump(frame, pcb); #endif (*p->p_emul->e_trapsignal)(l, &ksi); break; } case T_TRCTRAP: /* * Ignore debug register trace traps due to * accesses in the user's address space, which * can happen under several conditions such as * if a user sets a watchpoint on a buffer and * then passes that buffer to a system call. * We still want to get TRCTRAPS for addresses * in kernel space because that is useful when * debugging the kernel. */ if (x86_dbregs_user_trap()) break; /* Check whether they single-stepped into a lcall. */ if (frame->tf_rip == (uint64_t)IDTVEC(osyscall) || frame->tf_rip == (uint64_t)IDTVEC(syscall32)) { frame->tf_rflags &= ~PSL_T; return; } goto we_re_toast; case T_BPTFLT|T_USER: /* bpt instruction fault */ case T_TRCTRAP|T_USER: /* trace trap */ /* * Don't go single-stepping into a RAS. */ if (p->p_raslist == NULL || (ras_lookup(p, (void *)frame->tf_rip) == (void *)-1)) { KSI_INIT_TRAP(&ksi); ksi.ksi_signo = SIGTRAP; ksi.ksi_trap = type & ~T_USER; if (x86_dbregs_user_trap()) { x86_dbregs_store_dr6(l); ksi.ksi_code = TRAP_DBREG; } else if (type == (T_BPTFLT|T_USER)) ksi.ksi_code = TRAP_BRKPT; else ksi.ksi_code = TRAP_TRACE; (*p->p_emul->e_trapsignal)(l, &ksi); } break; case T_NMI: if (nmi_dispatch(frame)) return; /* NMI can be hooked up to a pushbutton for debugging */ if (kgdb_trap(type, frame)) return; if (kdb_trap(type, 0, frame)) return; /* machine/parity/power fail/"kitchen sink" faults */ x86_nmi(); return; } if ((type & T_USER) == 0) return; out: userret(l); return; trapsignal: (*p->p_emul->e_trapsignal)(l, &ksi); userret(l); } /* * startlwp: start of a new LWP. */ void startlwp(void *arg) { ucontext_t *uc = arg; lwp_t *l = curlwp; int error __diagused; error = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); KASSERT(error == 0); kmem_free(uc, sizeof(ucontext_t)); userret(l); } #ifdef TRAP_SIGDEBUG void frame_dump(struct trapframe *tf, struct pcb *pcb) { int i; unsigned long *p; printf("trapframe %p\n", tf); printf("rip 0x%016lx rsp 0x%016lx rfl 0x%016lx\n", tf->tf_rip, tf->tf_rsp, tf->tf_rflags); printf("rdi 0x%016lx rsi 0x%016lx rdx 0x%016lx\n", tf->tf_rdi, tf->tf_rsi, tf->tf_rdx); printf("rcx 0x%016lx r8 0x%016lx r9 0x%016lx\n", tf->tf_rcx, tf->tf_r8, tf->tf_r9); printf("r10 0x%016lx r11 0x%016lx r12 0x%016lx\n", tf->tf_r10, tf->tf_r11, tf->tf_r12); printf("r13 0x%016lx r14 0x%016lx r15 0x%016lx\n", tf->tf_r13, tf->tf_r14, tf->tf_r15); printf("rbp 0x%016lx rbx 0x%016lx rax 0x%016lx\n", tf->tf_rbp, tf->tf_rbx, tf->tf_rax); printf("cs 0x%04lx ds 0x%04lx es 0x%04lx " "fs 0x%04lx gs 0x%04lx ss 0x%04lx\n", tf->tf_cs & 0xffff, tf->tf_ds & 0xffff, tf->tf_es & 0xffff, tf->tf_fs & 0xffff, tf->tf_gs & 0xffff, tf->tf_ss & 0xffff); printf("fsbase 0x%016lx gsbase 0x%016lx\n", pcb->pcb_fs, pcb->pcb_gs); printf("\n"); printf("Stack dump:\n"); for (i = 0, p = (unsigned long *) tf; i < 20; i ++, p += 4) printf(" 0x%.16lx 0x%.16lx 0x%.16lx 0x%.16lx\n", p[0], p[1], p[2], p[3]); printf("\n"); } #endif