1 /* $OpenBSD: trap.c,v 1.19 1998/09/30 12:40:41 pefo Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 1988 University of Utah.
7 * Copyright (c) 1992, 1993
8 * The Regents of the University of California. All rights reserved.
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department and Ralph Campbell.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: Utah Hdr: trap.c 1.32 91/04/06
40 * from: @(#)trap.c 8.5 (Berkeley) 1/11/94
41 * JNPR: trap.c,v 1.13.2.2 2007/08/29 10:03:49 girish
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
47 #include "opt_ktrace.h"
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/sysent.h>
53 #include <sys/kernel.h>
55 #include <sys/signalvar.h>
56 #include <sys/syscall.h>
59 #include <vm/vm_extern.h>
60 #include <vm/vm_kern.h>
61 #include <vm/vm_page.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_param.h>
64 #include <sys/vmmeter.h>
65 #include <sys/ptrace.h>
68 #include <sys/vnode.h>
69 #include <sys/pioctl.h>
70 #include <sys/sysctl.h>
71 #include <sys/syslog.h>
74 #include <sys/ktrace.h>
76 #include <net/netisr.h>
78 #include <machine/trap.h>
79 #include <machine/cpu.h>
80 #include <machine/cpuinfo.h>
81 #include <machine/pte.h>
82 #include <machine/pmap.h>
83 #include <machine/md_var.h>
84 #include <machine/mips_opcode.h>
85 #include <machine/frame.h>
86 #include <machine/regnum.h>
87 #include <machine/tls.h>
90 #include <machine/db_machdep.h>
91 #include <ddb/db_sym.h>
97 #include <sys/dtrace_bsd.h>
102 SYSCTL_INT(_machdep, OID_AUTO, trap_debug, CTLFLAG_RW,
103 &trap_debug, 0, "Debug information on all traps");
106 #define lbu_macro(data, addr) \
107 __asm __volatile ("lbu %0, 0x0(%1)" \
108 : "=r" (data) /* outputs */ \
109 : "r" (addr)); /* inputs */
111 #define lb_macro(data, addr) \
112 __asm __volatile ("lb %0, 0x0(%1)" \
113 : "=r" (data) /* outputs */ \
114 : "r" (addr)); /* inputs */
116 #define lwl_macro(data, addr) \
117 __asm __volatile ("lwl %0, 0x0(%1)" \
118 : "=r" (data) /* outputs */ \
119 : "r" (addr)); /* inputs */
121 #define lwr_macro(data, addr) \
122 __asm __volatile ("lwr %0, 0x0(%1)" \
123 : "=r" (data) /* outputs */ \
124 : "r" (addr)); /* inputs */
126 #define ldl_macro(data, addr) \
127 __asm __volatile ("ldl %0, 0x0(%1)" \
128 : "=r" (data) /* outputs */ \
129 : "r" (addr)); /* inputs */
131 #define ldr_macro(data, addr) \
132 __asm __volatile ("ldr %0, 0x0(%1)" \
133 : "=r" (data) /* outputs */ \
134 : "r" (addr)); /* inputs */
136 #define sb_macro(data, addr) \
137 __asm __volatile ("sb %0, 0x0(%1)" \
139 : "r" (data), "r" (addr)); /* inputs */
141 #define swl_macro(data, addr) \
142 __asm __volatile ("swl %0, 0x0(%1)" \
144 : "r" (data), "r" (addr)); /* inputs */
146 #define swr_macro(data, addr) \
147 __asm __volatile ("swr %0, 0x0(%1)" \
149 : "r" (data), "r" (addr)); /* inputs */
151 #define sdl_macro(data, addr) \
152 __asm __volatile ("sdl %0, 0x0(%1)" \
154 : "r" (data), "r" (addr)); /* inputs */
156 #define sdr_macro(data, addr) \
157 __asm __volatile ("sdr %0, 0x0(%1)" \
159 : "r" (data), "r" (addr)); /* inputs */
161 static void log_illegal_instruction(const char *, struct trapframe *);
162 static void log_bad_page_fault(char *, struct trapframe *, int);
163 static void log_frame_dump(struct trapframe *frame);
164 static void get_mapping_info(vm_offset_t, pd_entry_t **, pt_entry_t **);
166 int (*dtrace_invop_jump_addr)(struct trapframe *);
169 static void trap_frame_dump(struct trapframe *frame);
172 void (*machExceptionTable[]) (void)= {
174 * The kernel exception handlers.
176 MipsKernIntr, /* external interrupt */
177 MipsKernGenException, /* TLB modification */
178 MipsTLBInvalidException,/* TLB miss (load or instr. fetch) */
179 MipsTLBInvalidException,/* TLB miss (store) */
180 MipsKernGenException, /* address error (load or I-fetch) */
181 MipsKernGenException, /* address error (store) */
182 MipsKernGenException, /* bus error (I-fetch) */
183 MipsKernGenException, /* bus error (load or store) */
184 MipsKernGenException, /* system call */
185 MipsKernGenException, /* breakpoint */
186 MipsKernGenException, /* reserved instruction */
187 MipsKernGenException, /* coprocessor unusable */
188 MipsKernGenException, /* arithmetic overflow */
189 MipsKernGenException, /* trap exception */
190 MipsKernGenException, /* virtual coherence exception inst */
191 MipsKernGenException, /* floating point exception */
192 MipsKernGenException, /* reserved */
193 MipsKernGenException, /* reserved */
194 MipsKernGenException, /* reserved */
195 MipsKernGenException, /* reserved */
196 MipsKernGenException, /* reserved */
197 MipsKernGenException, /* reserved */
198 MipsKernGenException, /* reserved */
199 MipsKernGenException, /* watch exception */
200 MipsKernGenException, /* reserved */
201 MipsKernGenException, /* reserved */
202 MipsKernGenException, /* reserved */
203 MipsKernGenException, /* reserved */
204 MipsKernGenException, /* reserved */
205 MipsKernGenException, /* reserved */
206 MipsKernGenException, /* reserved */
207 MipsKernGenException, /* virtual coherence exception data */
209 * The user exception handlers.
211 MipsUserIntr, /* 0 */
212 MipsUserGenException, /* 1 */
213 MipsTLBInvalidException,/* 2 */
214 MipsTLBInvalidException,/* 3 */
215 MipsUserGenException, /* 4 */
216 MipsUserGenException, /* 5 */
217 MipsUserGenException, /* 6 */
218 MipsUserGenException, /* 7 */
219 MipsUserGenException, /* 8 */
220 MipsUserGenException, /* 9 */
221 MipsUserGenException, /* 10 */
222 MipsUserGenException, /* 11 */
223 MipsUserGenException, /* 12 */
224 MipsUserGenException, /* 13 */
225 MipsUserGenException, /* 14 */
226 MipsUserGenException, /* 15 */
227 MipsUserGenException, /* 16 */
228 MipsUserGenException, /* 17 */
229 MipsUserGenException, /* 18 */
230 MipsUserGenException, /* 19 */
231 MipsUserGenException, /* 20 */
232 MipsUserGenException, /* 21 */
233 MipsUserGenException, /* 22 */
234 MipsUserGenException, /* 23 */
235 MipsUserGenException, /* 24 */
236 MipsUserGenException, /* 25 */
237 MipsUserGenException, /* 26 */
238 MipsUserGenException, /* 27 */
239 MipsUserGenException, /* 28 */
240 MipsUserGenException, /* 29 */
241 MipsUserGenException, /* 20 */
242 MipsUserGenException, /* 31 */
245 char *trap_type[] = {
246 "external interrupt",
248 "TLB miss (load or instr. fetch)",
250 "address error (load or I-fetch)",
251 "address error (store)",
252 "bus error (I-fetch)",
253 "bus error (load or store)",
256 "reserved instruction",
257 "coprocessor unusable",
258 "arithmetic overflow",
260 "virtual coherency instruction",
277 "virtual coherency data",
280 #if !defined(SMP) && (defined(DDB) || defined(DEBUG))
281 struct trapdebug trapdebug[TRAPSIZE], *trp = trapdebug;
284 #define KERNLAND(x) ((vm_offset_t)(x) >= VM_MIN_KERNEL_ADDRESS && (vm_offset_t)(x) < VM_MAX_KERNEL_ADDRESS)
285 #define DELAYBRANCH(x) ((x) & MIPS_CR_BR_DELAY)
288 * MIPS load/store access type
301 char *access_name[] = {
302 "Load Halfword Unsigned",
304 "Load Word Unsigned",
313 #include <machine/octeon_cop2.h>
316 static int allow_unaligned_acc = 1;
318 SYSCTL_INT(_vm, OID_AUTO, allow_unaligned_acc, CTLFLAG_RW,
319 &allow_unaligned_acc, 0, "Allow unaligned accesses");
322 * FP emulation is assumed to work on O32, but the code is outdated and crufty
323 * enough that it's a more sensible default to have it disabled when using
324 * other ABIs. At the very least, it needs a lot of help in using
325 * type-semantic ABI-oblivious macros for everything it does.
327 #if defined(__mips_o32)
328 static int emulate_fp = 1;
330 static int emulate_fp = 0;
332 SYSCTL_INT(_machdep, OID_AUTO, emulate_fp, CTLFLAG_RW,
333 &emulate_fp, 0, "Emulate unimplemented FPU instructions");
335 static int emulate_unaligned_access(struct trapframe *frame, int mode);
337 extern void fswintrberr(void); /* XXX */
340 cpu_fetch_syscall_args(struct thread *td)
342 struct trapframe *locr0;
343 struct sysentvec *se;
344 struct syscall_args *sa;
347 locr0 = td->td_frame;
350 bzero(sa->args, sizeof(sa->args));
352 /* compute next PC after syscall instruction */
353 td->td_pcb->pcb_tpc = sa->trapframe->pc; /* Remember if restart */
354 if (DELAYBRANCH(sa->trapframe->cause)) /* Check BD bit */
355 locr0->pc = MipsEmulateBranch(locr0, sa->trapframe->pc, 0, 0);
357 locr0->pc += sizeof(int);
358 sa->code = locr0->v0;
364 * This is an indirect syscall, in which the code is the first argument.
366 #if (!defined(__mips_n32) && !defined(__mips_n64)) || defined(COMPAT_FREEBSD32)
367 if (sa->code == SYS___syscall && SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
369 * Like syscall, but code is a quad, so as to maintain alignment
370 * for the rest of the arguments.
372 if (_QUAD_LOWWORD == 0)
373 sa->code = locr0->a0;
375 sa->code = locr0->a1;
376 sa->args[0] = locr0->a2;
377 sa->args[1] = locr0->a3;
383 * This is either not a quad syscall, or is a quad syscall with a
384 * new ABI in which quads fit in a single register.
386 sa->code = locr0->a0;
387 sa->args[0] = locr0->a1;
388 sa->args[1] = locr0->a2;
389 sa->args[2] = locr0->a3;
391 #if defined(__mips_n32) || defined(__mips_n64)
392 #ifdef COMPAT_FREEBSD32
393 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
396 * Non-o32 ABIs support more arguments in registers.
398 sa->args[3] = locr0->a4;
399 sa->args[4] = locr0->a5;
400 sa->args[5] = locr0->a6;
401 sa->args[6] = locr0->a7;
403 #ifdef COMPAT_FREEBSD32
410 * A direct syscall, arguments are just parameters to the syscall.
412 sa->args[0] = locr0->a0;
413 sa->args[1] = locr0->a1;
414 sa->args[2] = locr0->a2;
415 sa->args[3] = locr0->a3;
417 #if defined (__mips_n32) || defined(__mips_n64)
418 #ifdef COMPAT_FREEBSD32
419 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
422 * Non-o32 ABIs support more arguments in registers.
424 sa->args[4] = locr0->a4;
425 sa->args[5] = locr0->a5;
426 sa->args[6] = locr0->a6;
427 sa->args[7] = locr0->a7;
429 #ifdef COMPAT_FREEBSD32
438 printf("SYSCALL #%d pid:%u\n", sa->code, td->td_proc->p_pid);
441 se = td->td_proc->p_sysent;
444 * Shouldn't this go before switching on the code?
447 if (sa->code >= se->sv_size)
448 sa->callp = &se->sv_table[0];
450 sa->callp = &se->sv_table[sa->code];
452 sa->narg = sa->callp->sy_narg;
454 if (sa->narg > nsaved) {
455 #if defined(__mips_n32) || defined(__mips_n64)
458 * Is this right for new ABIs? I think the 4 there
459 * should be 8, size there are 8 registers to skip,
460 * not 4, but I'm not certain.
462 #ifdef COMPAT_FREEBSD32
463 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32))
465 printf("SYSCALL #%u pid:%u, narg (%u) > nsaved (%u).\n",
466 sa->code, td->td_proc->p_pid, sa->narg, nsaved);
468 #if (defined(__mips_n32) || defined(__mips_n64)) && defined(COMPAT_FREEBSD32)
469 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
473 error = 0; /* XXX GCC is awful. */
474 for (i = nsaved; i < sa->narg; i++) {
475 error = copyin((caddr_t)(intptr_t)(locr0->sp +
476 (4 + (i - nsaved)) * sizeof(int32_t)),
477 (caddr_t)&arg, sizeof arg);
484 error = copyin((caddr_t)(intptr_t)(locr0->sp +
485 4 * sizeof(register_t)), (caddr_t)&sa->args[nsaved],
486 (u_int)(sa->narg - nsaved) * sizeof(register_t));
495 td->td_retval[0] = 0;
496 td->td_retval[1] = locr0->v1;
504 #include "../../kern/subr_syscall.c"
507 * Handle an exception.
508 * Called from MipsKernGenException() or MipsUserGenException()
509 * when a processor trap occurs.
510 * In the case of a kernel trap, we return the pc where to resume if
511 * p->p_addr->u_pcb.pcb_onfault is set, otherwise, return old pc.
514 trap(struct trapframe *trapframe)
519 struct thread *td = curthread;
520 struct proc *p = curproc;
529 register_t *frame_regs;
531 trapdebug_enter(trapframe, 0);
538 type = (trapframe->cause & MIPS_CR_EXC_CODE) >> MIPS_CR_EXC_CODE_SHIFT;
539 if (TRAPF_USERMODE(trapframe)) {
547 * Enable hardware interrupts if they were on before the trap. If it
548 * was off disable all so we don't accidently enable it when doing a
549 * return to userland.
551 if (trapframe->sr & MIPS_SR_INT_IE) {
552 set_intr_mask(trapframe->sr & MIPS_SR_INT_MASK);
560 static vm_offset_t last_badvaddr = 0;
561 static vm_offset_t this_badvaddr = 0;
562 static int count = 0;
565 printf("trap type %x (%s - ", type,
566 trap_type[type & (~T_USER)]);
569 printf("user mode)\n");
571 printf("kernel mode)\n");
574 printf("cpuid = %d\n", PCPU_GET(cpuid));
576 pid = mips_rd_entryhi() & TLBHI_ASID_MASK;
577 printf("badaddr = %#jx, pc = %#jx, ra = %#jx, sp = %#jx, sr = %jx, pid = %d, ASID = %u\n",
578 (intmax_t)trapframe->badvaddr, (intmax_t)trapframe->pc, (intmax_t)trapframe->ra,
579 (intmax_t)trapframe->sp, (intmax_t)trapframe->sr,
580 (curproc ? curproc->p_pid : -1), pid);
582 switch (type & ~T_USER) {
588 this_badvaddr = trapframe->badvaddr;
591 this_badvaddr = trapframe->ra;
594 this_badvaddr = trapframe->pc;
597 if ((last_badvaddr == this_badvaddr) &&
598 ((type & ~T_USER) != T_SYSCALL) &&
599 ((type & ~T_USER) != T_COP_UNUSABLE)) {
601 trap_frame_dump(trapframe);
602 panic("too many faults at %p\n", (void *)last_badvaddr);
605 last_badvaddr = this_badvaddr;
613 * A trap can occur while DTrace executes a probe. Before
614 * executing the probe, DTrace blocks re-scheduling and sets
615 * a flag in its per-cpu flags to indicate that it doesn't
616 * want to fault. On returning from the probe, the no-fault
617 * flag is cleared and finally re-scheduling is enabled.
619 * If the DTrace kernel module has registered a trap handler,
620 * call it and if it returns non-zero, assume that it has
621 * handled the trap and modified the trap frame so that this
622 * function can return normally.
625 * XXXDTRACE: add pid probe handler here (if ever)
628 if (dtrace_trap_func != NULL &&
629 (*dtrace_trap_func)(trapframe, type) != 0)
630 return (trapframe->pc);
637 kdb_trap(type, 0, trapframe);
642 /* check for kernel address */
643 if (KERNLAND(trapframe->badvaddr)) {
644 if (pmap_emulate_modified(kernel_pmap,
645 trapframe->badvaddr) != 0) {
646 ftype = VM_PROT_WRITE;
649 return (trapframe->pc);
653 case T_TLB_MOD + T_USER:
654 pmap = &p->p_vmspace->vm_pmap;
655 if (pmap_emulate_modified(pmap, trapframe->badvaddr) != 0) {
656 ftype = VM_PROT_WRITE;
660 return (trapframe->pc);
665 ftype = (type == T_TLB_ST_MISS) ? VM_PROT_WRITE : VM_PROT_READ;
666 /* check for kernel address */
667 if (KERNLAND(trapframe->badvaddr)) {
672 va = trunc_page((vm_offset_t)trapframe->badvaddr);
673 rv = vm_fault(kernel_map, va, ftype, VM_FAULT_NORMAL);
674 if (rv == KERN_SUCCESS)
675 return (trapframe->pc);
676 if (td->td_pcb->pcb_onfault != NULL) {
677 pc = (register_t)(intptr_t)td->td_pcb->pcb_onfault;
678 td->td_pcb->pcb_onfault = NULL;
685 * It is an error for the kernel to access user space except
686 * through the copyin/copyout routines.
688 if (td->td_pcb->pcb_onfault == NULL)
693 case T_TLB_LD_MISS + T_USER:
694 ftype = VM_PROT_READ;
697 case T_TLB_ST_MISS + T_USER:
698 ftype = VM_PROT_WRITE;
708 va = trunc_page((vm_offset_t)trapframe->badvaddr);
709 if (KERNLAND(trapframe->badvaddr)) {
711 * Don't allow user-mode faults in kernel
717 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
719 * XXXDTRACE: add dtrace_doubletrap_func here?
722 printf("vm_fault(%p (pmap %p), %p (%p), %x, %d) -> %x at pc %p\n",
723 map, &vm->vm_pmap, (void *)va, (void *)(intptr_t)trapframe->badvaddr,
724 ftype, VM_FAULT_NORMAL, rv, (void *)(intptr_t)trapframe->pc);
727 if (rv == KERN_SUCCESS) {
729 return (trapframe->pc);
735 if (td->td_pcb->pcb_onfault != NULL) {
736 pc = (register_t)(intptr_t)td->td_pcb->pcb_onfault;
737 td->td_pcb->pcb_onfault = NULL;
743 if (rv == KERN_PROTECTION_FAILURE)
747 addr = trapframe->pc;
749 msg = "BAD_PAGE_FAULT";
750 log_bad_page_fault(msg, trapframe, type);
755 case T_ADDR_ERR_LD + T_USER: /* misaligned or kseg access */
756 case T_ADDR_ERR_ST + T_USER: /* misaligned or kseg access */
757 if (trapframe->badvaddr < 0 ||
758 trapframe->badvaddr >= VM_MAXUSER_ADDRESS) {
759 msg = "ADDRESS_SPACE_ERR";
760 } else if (allow_unaligned_acc) {
763 if (type == (T_ADDR_ERR_LD + T_USER))
766 mode = VM_PROT_WRITE;
768 access_type = emulate_unaligned_access(trapframe, mode);
769 if (access_type != 0)
771 msg = "ALIGNMENT_FIX_ERR";
778 case T_BUS_ERR_IFETCH + T_USER: /* BERR asserted to cpu */
779 case T_BUS_ERR_LD_ST + T_USER: /* BERR asserted to cpu */
780 ucode = 0; /* XXX should be VM_PROT_something */
782 addr = trapframe->pc;
785 log_bad_page_fault(msg, trapframe, type);
788 case T_SYSCALL + T_USER:
790 td->td_sa.trapframe = trapframe;
793 #if !defined(SMP) && (defined(DDB) || defined(DEBUG))
794 if (trp == trapdebug)
795 trapdebug[TRAPSIZE - 1].code = td->td_sa.code;
797 trp[-1].code = td->td_sa.code;
799 trapdebug_enter(td->td_frame, -td->td_sa.code);
802 * The sync'ing of I & D caches for SYS_ptrace() is
803 * done by procfs_domem() through procfs_rwmem()
804 * instead of being done here under a special check
808 return (trapframe->pc);
811 #if defined(KDTRACE_HOOKS) || defined(DDB)
814 if (!usermode && dtrace_invop_jump_addr != 0) {
815 dtrace_invop_jump_addr(trapframe);
816 return (trapframe->pc);
820 kdb_trap(type, 0, trapframe);
821 return (trapframe->pc);
825 case T_BREAK + T_USER:
832 addr = trapframe->pc;
834 /* compute address of break instruction */
836 if (DELAYBRANCH(trapframe->cause))
839 if (td->td_md.md_ss_addr != va)
842 /* read break instruction */
843 instr = fuword32((caddr_t)va);
845 if (instr != MIPS_BREAK_SSTEP)
849 "trap: tid %d, single step at %#lx: %#08x",
850 td->td_tid, va, instr);
853 error = ptrace_clear_single_step(td);
861 case T_IWATCH + T_USER:
862 case T_DWATCH + T_USER:
866 /* compute address of trapped instruction */
868 if (DELAYBRANCH(trapframe->cause))
870 printf("watch exception @ %p\n", (void *)va);
877 case T_TRAP + T_USER:
880 struct trapframe *locr0 = td->td_frame;
882 /* compute address of trap instruction */
884 if (DELAYBRANCH(trapframe->cause))
887 if (DELAYBRANCH(trapframe->cause)) { /* Check BD bit */
888 locr0->pc = MipsEmulateBranch(locr0, trapframe->pc, 0,
891 locr0->pc += sizeof(int);
894 i = SIGEMT; /* Stuff it with something for now */
898 case T_RES_INST + T_USER:
901 inst = *(InstFmt *)(intptr_t)trapframe->pc;
902 switch (inst.RType.op) {
904 switch (inst.RType.func) {
906 /* Register 29 used for TLS */
907 if (inst.RType.rd == 29) {
908 frame_regs = &(trapframe->zero);
909 frame_regs[inst.RType.rt] = (register_t)(intptr_t)td->td_md.md_tls;
910 frame_regs[inst.RType.rt] += td->td_md.md_tls_tcb_offset;
911 trapframe->pc += sizeof(int);
919 log_illegal_instruction("RES_INST", trapframe);
921 addr = trapframe->pc;
930 cop = (trapframe->cause & MIPS_CR_COP_ERR) >> MIPS_CR_COP_ERR_SHIFT;
931 /* Handle only COP2 exception */
935 addr = trapframe->pc;
936 /* save userland cop2 context if it has been touched */
937 if ((td->td_md.md_flags & MDTD_COP2USED) &&
938 (td->td_md.md_cop2owner == COP2_OWNER_USERLAND)) {
939 if (td->td_md.md_ucop2)
940 octeon_cop2_save(td->td_md.md_ucop2);
942 panic("COP2 was used in user mode but md_ucop2 is NULL");
945 if (td->td_md.md_cop2 == NULL) {
946 td->td_md.md_cop2 = octeon_cop2_alloc_ctx();
947 if (td->td_md.md_cop2 == NULL)
948 panic("Failed to allocate COP2 context");
949 memset(td->td_md.md_cop2, 0, sizeof(*td->td_md.md_cop2));
952 octeon_cop2_restore(td->td_md.md_cop2);
954 /* Make userland re-request its context */
955 td->td_frame->sr &= ~MIPS_SR_COP_2_BIT;
956 td->td_md.md_flags |= MDTD_COP2USED;
957 td->td_md.md_cop2owner = COP2_OWNER_KERNEL;
958 /* Enable COP2, it will be disabled in cpu_switch */
959 mips_wr_status(mips_rd_status() | MIPS_SR_COP_2_BIT);
960 return (trapframe->pc);
966 case T_COP_UNUSABLE + T_USER:
967 cop = (trapframe->cause & MIPS_CR_COP_ERR) >> MIPS_CR_COP_ERR_SHIFT;
969 /* FP (COP1) instruction */
970 if (cpuinfo.fpu_id == 0) {
971 log_illegal_instruction("COP1_UNUSABLE",
976 addr = trapframe->pc;
977 MipsSwitchFPState(PCPU_GET(fpcurthread), td->td_frame);
978 PCPU_SET(fpcurthread, td);
979 #if defined(__mips_n32) || defined(__mips_n64)
980 td->td_frame->sr |= MIPS_SR_COP_1_BIT | MIPS_SR_FR;
982 td->td_frame->sr |= MIPS_SR_COP_1_BIT;
984 td->td_md.md_flags |= MDTD_FPUSED;
989 addr = trapframe->pc;
990 if ((td->td_md.md_flags & MDTD_COP2USED) &&
991 (td->td_md.md_cop2owner == COP2_OWNER_KERNEL)) {
992 if (td->td_md.md_cop2)
993 octeon_cop2_save(td->td_md.md_cop2);
995 panic("COP2 was used in kernel mode but md_cop2 is NULL");
998 if (td->td_md.md_ucop2 == NULL) {
999 td->td_md.md_ucop2 = octeon_cop2_alloc_ctx();
1000 if (td->td_md.md_ucop2 == NULL)
1001 panic("Failed to allocate userland COP2 context");
1002 memset(td->td_md.md_ucop2, 0, sizeof(*td->td_md.md_ucop2));
1005 octeon_cop2_restore(td->td_md.md_ucop2);
1007 td->td_frame->sr |= MIPS_SR_COP_2_BIT;
1008 td->td_md.md_flags |= MDTD_COP2USED;
1009 td->td_md.md_cop2owner = COP2_OWNER_USERLAND;
1014 log_illegal_instruction("COPn_UNUSABLE", trapframe);
1015 i = SIGILL; /* only FPU instructions allowed */
1020 #if !defined(SMP) && (defined(DDB) || defined(DEBUG))
1023 printf("FPU Trap: PC %#jx CR %x SR %x\n",
1024 (intmax_t)trapframe->pc, (unsigned)trapframe->cause, (unsigned)trapframe->sr);
1028 case T_FPE + T_USER:
1031 addr = trapframe->pc;
1034 MipsFPTrap(trapframe->sr, trapframe->cause, trapframe->pc);
1037 case T_OVFLOW + T_USER:
1039 addr = trapframe->pc;
1042 case T_ADDR_ERR_LD: /* misaligned access */
1043 case T_ADDR_ERR_ST: /* misaligned access */
1046 printf("+++ ADDR_ERR: type = %d, badvaddr = %#jx\n", type,
1047 (intmax_t)trapframe->badvaddr);
1050 /* Only allow emulation on a user address */
1051 if (allow_unaligned_acc &&
1052 ((vm_offset_t)trapframe->badvaddr < VM_MAXUSER_ADDRESS)) {
1055 if (type == T_ADDR_ERR_LD)
1056 mode = VM_PROT_READ;
1058 mode = VM_PROT_WRITE;
1060 access_type = emulate_unaligned_access(trapframe, mode);
1061 if (access_type != 0)
1062 return (trapframe->pc);
1066 case T_BUS_ERR_LD_ST: /* BERR asserted to cpu */
1067 if (td->td_pcb->pcb_onfault != NULL) {
1068 pc = (register_t)(intptr_t)td->td_pcb->pcb_onfault;
1069 td->td_pcb->pcb_onfault = NULL;
1078 #if !defined(SMP) && defined(DEBUG)
1082 printf("cpu:%d-", PCPU_GET(cpuid));
1084 printf("Trap cause = %d (%s - ", type,
1085 trap_type[type & (~T_USER)]);
1088 printf("user mode)\n");
1090 printf("kernel mode)\n");
1094 printf("badvaddr = %#jx, pc = %#jx, ra = %#jx, sr = %#jxx\n",
1095 (intmax_t)trapframe->badvaddr, (intmax_t)trapframe->pc, (intmax_t)trapframe->ra,
1096 (intmax_t)trapframe->sr);
1100 if (debugger_on_trap) {
1101 kdb_why = KDB_WHY_TRAP;
1102 kdb_trap(type, 0, trapframe);
1103 kdb_why = KDB_WHY_UNSET;
1108 td->td_frame->pc = trapframe->pc;
1109 td->td_frame->cause = trapframe->cause;
1110 td->td_frame->badvaddr = trapframe->badvaddr;
1111 ksiginfo_init_trap(&ksi);
1113 ksi.ksi_code = ucode;
1114 ksi.ksi_addr = (void *)addr;
1115 ksi.ksi_trapno = type;
1116 trapsignal(td, &ksi);
1120 * Note: we should only get here if returning to user mode.
1122 userret(td, trapframe);
1123 return (trapframe->pc);
1126 #if !defined(SMP) && (defined(DDB) || defined(DEBUG))
1134 printf("trapDump(%s)\n", msg);
1135 for (i = 0; i < TRAPSIZE; i++) {
1136 if (trp == trapdebug) {
1137 trp = &trapdebug[TRAPSIZE - 1];
1142 if (trp->cause == 0)
1145 printf("%s: ADR %jx PC %jx CR %jx SR %jx\n",
1146 trap_type[(trp->cause & MIPS_CR_EXC_CODE) >>
1147 MIPS_CR_EXC_CODE_SHIFT],
1148 (intmax_t)trp->vadr, (intmax_t)trp->pc,
1149 (intmax_t)trp->cause, (intmax_t)trp->status);
1151 printf(" RA %jx SP %jx code %d\n", (intmax_t)trp->ra,
1152 (intmax_t)trp->sp, (int)trp->code);
1160 * Return the resulting PC as if the branch was executed.
1163 MipsEmulateBranch(struct trapframe *framePtr, uintptr_t instPC, int fpcCSR,
1167 register_t *regsPtr = (register_t *) framePtr;
1168 uintptr_t retAddr = 0;
1171 #define GetBranchDest(InstPtr, inst) \
1172 (InstPtr + 4 + ((short)inst.IType.imm << 2))
1176 if (instptr < MIPS_KSEG0_START)
1177 inst.word = fuword32((void *)instptr);
1179 inst = *(InstFmt *) instptr;
1181 if ((vm_offset_t)instPC < MIPS_KSEG0_START)
1182 inst.word = fuword32((void *)instPC);
1184 inst = *(InstFmt *) instPC;
1187 switch ((int)inst.JType.op) {
1189 switch ((int)inst.RType.func) {
1192 retAddr = regsPtr[inst.RType.rs];
1196 retAddr = instPC + 4;
1202 switch ((int)inst.IType.rt) {
1207 if ((int)(regsPtr[inst.RType.rs]) < 0)
1208 retAddr = GetBranchDest(instPC, inst);
1210 retAddr = instPC + 8;
1217 if ((int)(regsPtr[inst.RType.rs]) >= 0)
1218 retAddr = GetBranchDest(instPC, inst);
1220 retAddr = instPC + 8;
1229 retAddr = instPC + 4; /* Like syscall... */
1233 panic("MipsEmulateBranch: Bad branch cond");
1239 retAddr = (inst.JType.target << 2) |
1240 ((unsigned)(instPC + 4) & 0xF0000000);
1245 if (regsPtr[inst.RType.rs] == regsPtr[inst.RType.rt])
1246 retAddr = GetBranchDest(instPC, inst);
1248 retAddr = instPC + 8;
1253 if (regsPtr[inst.RType.rs] != regsPtr[inst.RType.rt])
1254 retAddr = GetBranchDest(instPC, inst);
1256 retAddr = instPC + 8;
1261 if ((int)(regsPtr[inst.RType.rs]) <= 0)
1262 retAddr = GetBranchDest(instPC, inst);
1264 retAddr = instPC + 8;
1269 if ((int)(regsPtr[inst.RType.rs]) > 0)
1270 retAddr = GetBranchDest(instPC, inst);
1272 retAddr = instPC + 8;
1276 switch (inst.RType.rs) {
1279 if ((inst.RType.rt & COPz_BC_TF_MASK) == COPz_BC_TRUE)
1280 condition = fpcCSR & MIPS_FPU_COND_BIT;
1282 condition = !(fpcCSR & MIPS_FPU_COND_BIT);
1284 retAddr = GetBranchDest(instPC, inst);
1286 retAddr = instPC + 8;
1290 retAddr = instPC + 4;
1295 retAddr = instPC + 4;
1301 log_frame_dump(struct trapframe *frame)
1303 log(LOG_ERR, "Trapframe Register Dump:\n");
1304 log(LOG_ERR, "\tzero: %#jx\tat: %#jx\tv0: %#jx\tv1: %#jx\n",
1305 (intmax_t)0, (intmax_t)frame->ast, (intmax_t)frame->v0, (intmax_t)frame->v1);
1307 log(LOG_ERR, "\ta0: %#jx\ta1: %#jx\ta2: %#jx\ta3: %#jx\n",
1308 (intmax_t)frame->a0, (intmax_t)frame->a1, (intmax_t)frame->a2, (intmax_t)frame->a3);
1310 #if defined(__mips_n32) || defined(__mips_n64)
1311 log(LOG_ERR, "\ta4: %#jx\ta5: %#jx\ta6: %#jx\ta6: %#jx\n",
1312 (intmax_t)frame->a4, (intmax_t)frame->a5, (intmax_t)frame->a6, (intmax_t)frame->a7);
1314 log(LOG_ERR, "\tt0: %#jx\tt1: %#jx\tt2: %#jx\tt3: %#jx\n",
1315 (intmax_t)frame->t0, (intmax_t)frame->t1, (intmax_t)frame->t2, (intmax_t)frame->t3);
1317 log(LOG_ERR, "\tt0: %#jx\tt1: %#jx\tt2: %#jx\tt3: %#jx\n",
1318 (intmax_t)frame->t0, (intmax_t)frame->t1, (intmax_t)frame->t2, (intmax_t)frame->t3);
1320 log(LOG_ERR, "\tt4: %#jx\tt5: %#jx\tt6: %#jx\tt7: %#jx\n",
1321 (intmax_t)frame->t4, (intmax_t)frame->t5, (intmax_t)frame->t6, (intmax_t)frame->t7);
1323 log(LOG_ERR, "\tt8: %#jx\tt9: %#jx\ts0: %#jx\ts1: %#jx\n",
1324 (intmax_t)frame->t8, (intmax_t)frame->t9, (intmax_t)frame->s0, (intmax_t)frame->s1);
1326 log(LOG_ERR, "\ts2: %#jx\ts3: %#jx\ts4: %#jx\ts5: %#jx\n",
1327 (intmax_t)frame->s2, (intmax_t)frame->s3, (intmax_t)frame->s4, (intmax_t)frame->s5);
1329 log(LOG_ERR, "\ts6: %#jx\ts7: %#jx\tk0: %#jx\tk1: %#jx\n",
1330 (intmax_t)frame->s6, (intmax_t)frame->s7, (intmax_t)frame->k0, (intmax_t)frame->k1);
1332 log(LOG_ERR, "\tgp: %#jx\tsp: %#jx\ts8: %#jx\tra: %#jx\n",
1333 (intmax_t)frame->gp, (intmax_t)frame->sp, (intmax_t)frame->s8, (intmax_t)frame->ra);
1335 log(LOG_ERR, "\tsr: %#jx\tmullo: %#jx\tmulhi: %#jx\tbadvaddr: %#jx\n",
1336 (intmax_t)frame->sr, (intmax_t)frame->mullo, (intmax_t)frame->mulhi, (intmax_t)frame->badvaddr);
1338 log(LOG_ERR, "\tcause: %#jx\tpc: %#jx\n",
1339 (intmax_t)frame->cause, (intmax_t)frame->pc);
1344 trap_frame_dump(struct trapframe *frame)
1346 printf("Trapframe Register Dump:\n");
1347 printf("\tzero: %#jx\tat: %#jx\tv0: %#jx\tv1: %#jx\n",
1348 (intmax_t)0, (intmax_t)frame->ast, (intmax_t)frame->v0, (intmax_t)frame->v1);
1350 printf("\ta0: %#jx\ta1: %#jx\ta2: %#jx\ta3: %#jx\n",
1351 (intmax_t)frame->a0, (intmax_t)frame->a1, (intmax_t)frame->a2, (intmax_t)frame->a3);
1352 #if defined(__mips_n32) || defined(__mips_n64)
1353 printf("\ta4: %#jx\ta5: %#jx\ta6: %#jx\ta7: %#jx\n",
1354 (intmax_t)frame->a4, (intmax_t)frame->a5, (intmax_t)frame->a6, (intmax_t)frame->a7);
1356 printf("\tt0: %#jx\tt1: %#jx\tt2: %#jx\tt3: %#jx\n",
1357 (intmax_t)frame->t0, (intmax_t)frame->t1, (intmax_t)frame->t2, (intmax_t)frame->t3);
1359 printf("\tt0: %#jx\tt1: %#jx\tt2: %#jx\tt3: %#jx\n",
1360 (intmax_t)frame->t0, (intmax_t)frame->t1, (intmax_t)frame->t2, (intmax_t)frame->t3);
1362 printf("\tt4: %#jx\tt5: %#jx\tt6: %#jx\tt7: %#jx\n",
1363 (intmax_t)frame->t4, (intmax_t)frame->t5, (intmax_t)frame->t6, (intmax_t)frame->t7);
1365 printf("\tt8: %#jx\tt9: %#jx\ts0: %#jx\ts1: %#jx\n",
1366 (intmax_t)frame->t8, (intmax_t)frame->t9, (intmax_t)frame->s0, (intmax_t)frame->s1);
1368 printf("\ts2: %#jx\ts3: %#jx\ts4: %#jx\ts5: %#jx\n",
1369 (intmax_t)frame->s2, (intmax_t)frame->s3, (intmax_t)frame->s4, (intmax_t)frame->s5);
1371 printf("\ts6: %#jx\ts7: %#jx\tk0: %#jx\tk1: %#jx\n",
1372 (intmax_t)frame->s6, (intmax_t)frame->s7, (intmax_t)frame->k0, (intmax_t)frame->k1);
1374 printf("\tgp: %#jx\tsp: %#jx\ts8: %#jx\tra: %#jx\n",
1375 (intmax_t)frame->gp, (intmax_t)frame->sp, (intmax_t)frame->s8, (intmax_t)frame->ra);
1377 printf("\tsr: %#jx\tmullo: %#jx\tmulhi: %#jx\tbadvaddr: %#jx\n",
1378 (intmax_t)frame->sr, (intmax_t)frame->mullo, (intmax_t)frame->mulhi, (intmax_t)frame->badvaddr);
1380 printf("\tcause: %#jx\tpc: %#jx\n",
1381 (intmax_t)frame->cause, (intmax_t)frame->pc);
1388 get_mapping_info(vm_offset_t va, pd_entry_t **pdepp, pt_entry_t **ptepp)
1392 struct proc *p = curproc;
1394 pdep = (&(p->p_vmspace->vm_pmap.pm_segtab[(va >> SEGSHIFT) & (NPDEPG - 1)]));
1396 ptep = pmap_pte(&p->p_vmspace->vm_pmap, va);
1398 ptep = (pt_entry_t *)0;
1405 log_illegal_instruction(const char *msg, struct trapframe *frame)
1418 printf("cpuid = %d\n", PCPU_GET(cpuid));
1420 pc = frame->pc + (DELAYBRANCH(frame->cause) ? 4 : 0);
1421 log(LOG_ERR, "%s: pid %d tid %ld (%s), uid %d: pc %#jx ra %#jx\n",
1422 msg, p->p_pid, (long)td->td_tid, p->p_comm,
1423 p->p_ucred ? p->p_ucred->cr_uid : -1,
1425 (intmax_t)frame->ra);
1427 /* log registers in trap frame */
1428 log_frame_dump(frame);
1430 get_mapping_info((vm_offset_t)pc, &pdep, &ptep);
1433 * Dump a few words around faulting instruction, if the addres is
1437 useracc((caddr_t)(intptr_t)pc, sizeof(int) * 4, VM_PROT_READ)) {
1438 /* dump page table entry for faulting instruction */
1439 log(LOG_ERR, "Page table info for pc address %#jx: pde = %p, pte = %#jx\n",
1440 (intmax_t)pc, (void *)(intptr_t)*pdep, (uintmax_t)(ptep ? *ptep : 0));
1442 addr = (unsigned int *)(intptr_t)pc;
1443 log(LOG_ERR, "Dumping 4 words starting at pc address %p: \n",
1445 log(LOG_ERR, "%08x %08x %08x %08x\n",
1446 addr[0], addr[1], addr[2], addr[3]);
1448 log(LOG_ERR, "pc address %#jx is inaccessible, pde = %p, pte = %#jx\n",
1449 (intmax_t)pc, (void *)(intptr_t)*pdep, (uintmax_t)(ptep ? *ptep : 0));
1454 log_bad_page_fault(char *msg, struct trapframe *frame, int trap_type)
1461 char *read_or_write;
1464 trap_type &= ~T_USER;
1470 printf("cpuid = %d\n", PCPU_GET(cpuid));
1472 switch (trap_type) {
1476 read_or_write = "write";
1480 case T_BUS_ERR_IFETCH:
1481 read_or_write = "read";
1484 read_or_write = "unknown";
1487 pc = frame->pc + (DELAYBRANCH(frame->cause) ? 4 : 0);
1488 log(LOG_ERR, "%s: pid %d tid %ld (%s), uid %d: pc %#jx got a %s fault "
1489 "(type %#x) at %#jx\n",
1490 msg, p->p_pid, (long)td->td_tid, p->p_comm,
1491 p->p_ucred ? p->p_ucred->cr_uid : -1,
1495 (intmax_t)frame->badvaddr);
1497 /* log registers in trap frame */
1498 log_frame_dump(frame);
1500 get_mapping_info((vm_offset_t)pc, &pdep, &ptep);
1503 * Dump a few words around faulting instruction, if the addres is
1506 if (!(pc & 3) && (pc != frame->badvaddr) &&
1507 (trap_type != T_BUS_ERR_IFETCH) &&
1508 useracc((caddr_t)(intptr_t)pc, sizeof(int) * 4, VM_PROT_READ)) {
1509 /* dump page table entry for faulting instruction */
1510 log(LOG_ERR, "Page table info for pc address %#jx: pde = %p, pte = %#jx\n",
1511 (intmax_t)pc, (void *)(intptr_t)*pdep, (uintmax_t)(ptep ? *ptep : 0));
1513 addr = (unsigned int *)(intptr_t)pc;
1514 log(LOG_ERR, "Dumping 4 words starting at pc address %p: \n",
1516 log(LOG_ERR, "%08x %08x %08x %08x\n",
1517 addr[0], addr[1], addr[2], addr[3]);
1519 log(LOG_ERR, "pc address %#jx is inaccessible, pde = %p, pte = %#jx\n",
1520 (intmax_t)pc, (void *)(intptr_t)*pdep, (uintmax_t)(ptep ? *ptep : 0));
1523 get_mapping_info((vm_offset_t)frame->badvaddr, &pdep, &ptep);
1524 log(LOG_ERR, "Page table info for bad address %#jx: pde = %p, pte = %#jx\n",
1525 (intmax_t)frame->badvaddr, (void *)(intptr_t)*pdep, (uintmax_t)(ptep ? *ptep : 0));
1530 * Unaligned load/store emulation
1533 mips_unaligned_load_store(struct trapframe *frame, int mode, register_t addr, register_t pc)
1535 register_t *reg = (register_t *) frame;
1536 u_int32_t inst = *((u_int32_t *)(intptr_t)pc);
1537 register_t value_msb, value;
1541 * ADDR_ERR faults have higher priority than TLB
1542 * Miss faults. Therefore, it is necessary to
1543 * verify that the faulting address is a valid
1544 * virtual address within the process' address space
1545 * before trying to emulate the unaligned access.
1547 switch (MIPS_INST_OPCODE(inst)) {
1548 case OP_LHU: case OP_LH:
1552 case OP_LWU: case OP_LW:
1561 printf("%s: unhandled opcode in address error: %#x\n", __func__, MIPS_INST_OPCODE(inst));
1565 if (!useracc((void *)rounddown2((vm_offset_t)addr, size), size * 2, mode))
1570 * Handle LL/SC LLD/SCD.
1572 switch (MIPS_INST_OPCODE(inst)) {
1574 KASSERT(mode == VM_PROT_READ, ("access mode must be read for load instruction."));
1575 lbu_macro(value_msb, addr);
1577 lbu_macro(value, addr);
1578 value |= value_msb << 8;
1579 reg[MIPS_INST_RT(inst)] = value;
1580 return (MIPS_LHU_ACCESS);
1583 KASSERT(mode == VM_PROT_READ, ("access mode must be read for load instruction."));
1584 lb_macro(value_msb, addr);
1586 lbu_macro(value, addr);
1587 value |= value_msb << 8;
1588 reg[MIPS_INST_RT(inst)] = value;
1589 return (MIPS_LH_ACCESS);
1592 KASSERT(mode == VM_PROT_READ, ("access mode must be read for load instruction."));
1593 lwl_macro(value, addr);
1595 lwr_macro(value, addr);
1596 value &= 0xffffffff;
1597 reg[MIPS_INST_RT(inst)] = value;
1598 return (MIPS_LWU_ACCESS);
1601 KASSERT(mode == VM_PROT_READ, ("access mode must be read for load instruction."));
1602 lwl_macro(value, addr);
1604 lwr_macro(value, addr);
1605 reg[MIPS_INST_RT(inst)] = value;
1606 return (MIPS_LW_ACCESS);
1608 #if defined(__mips_n32) || defined(__mips_n64)
1610 KASSERT(mode == VM_PROT_READ, ("access mode must be read for load instruction."));
1611 ldl_macro(value, addr);
1613 ldr_macro(value, addr);
1614 reg[MIPS_INST_RT(inst)] = value;
1615 return (MIPS_LD_ACCESS);
1619 KASSERT(mode == VM_PROT_WRITE, ("access mode must be write for store instruction."));
1620 value = reg[MIPS_INST_RT(inst)];
1621 value_msb = value >> 8;
1622 sb_macro(value_msb, addr);
1624 sb_macro(value, addr);
1625 return (MIPS_SH_ACCESS);
1628 KASSERT(mode == VM_PROT_WRITE, ("access mode must be write for store instruction."));
1629 value = reg[MIPS_INST_RT(inst)];
1630 swl_macro(value, addr);
1632 swr_macro(value, addr);
1633 return (MIPS_SW_ACCESS);
1635 #if defined(__mips_n32) || defined(__mips_n64)
1637 KASSERT(mode == VM_PROT_WRITE, ("access mode must be write for store instruction."));
1638 value = reg[MIPS_INST_RT(inst)];
1639 sdl_macro(value, addr);
1641 sdr_macro(value, addr);
1642 return (MIPS_SD_ACCESS);
1645 panic("%s: should not be reached.", __func__);
1652 static struct timeval unaligned_lasterr;
1653 static int unaligned_curerr;
1655 static int unaligned_pps_log_limit = 4;
1657 SYSCTL_INT(_machdep, OID_AUTO, unaligned_log_pps_limit, CTLFLAG_RWTUN,
1658 &unaligned_pps_log_limit, 0,
1659 "limit number of userland unaligned log messages per second");
1662 emulate_unaligned_access(struct trapframe *frame, int mode)
1665 int access_type = 0;
1666 struct thread *td = curthread;
1667 struct proc *p = curproc;
1669 pc = frame->pc + (DELAYBRANCH(frame->cause) ? 4 : 0);
1672 * Fall through if it's instruction fetch exception
1674 if (!((pc & 3) || (pc == frame->badvaddr))) {
1677 * Handle unaligned load and store
1681 * Return access type if the instruction was emulated.
1682 * Otherwise restore pc and fall through.
1684 access_type = mips_unaligned_load_store(frame,
1685 mode, frame->badvaddr, pc);
1688 if (DELAYBRANCH(frame->cause))
1689 frame->pc = MipsEmulateBranch(frame, frame->pc,
1694 if (ppsratecheck(&unaligned_lasterr,
1695 &unaligned_curerr, unaligned_pps_log_limit)) {
1696 /* XXX TODO: keep global/tid/pid counters? */
1698 "Unaligned %s: pid=%ld (%s), tid=%ld, "
1699 "pc=%#jx, badvaddr=%#jx\n",
1700 access_name[access_type - 1],
1705 (intmax_t)frame->badvaddr);