The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/vm_machdep.c

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    1 /*-
    2  * Copyright (c) 1982, 1986 The Regents of the University of California.
    3  * Copyright (c) 1989, 1990 William Jolitz
    4  * Copyright (c) 1994 John Dyson
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * the Systems Programming Group of the University of Utah Computer
    9  * Science Department, and William Jolitz.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      from: @(#)vm_machdep.c  7.3 (Berkeley) 5/13/91
   36  *      Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
   37  *      from: src/sys/i386/i386/vm_machdep.c,v 1.132.2.2 2000/08/26 04:19:26 yokota
   38  *      JNPR: vm_machdep.c,v 1.8.2.2 2007/08/16 15:59:17 girish
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: stable/8/sys/mips/mips/vm_machdep.c 217816 2011-01-25 10:14:12Z kib $");
   43 
   44 #include "opt_cputype.h"
   45 #include "opt_ddb.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/malloc.h>
   50 #include <sys/proc.h>
   51 #include <sys/syscall.h>
   52 #include <sys/buf.h>
   53 #include <sys/vnode.h>
   54 #include <sys/vmmeter.h>
   55 #include <sys/kernel.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/unistd.h>
   58 
   59 #include <machine/asm.h>
   60 #include <machine/cache.h>
   61 #include <machine/clock.h>
   62 #include <machine/cpu.h>
   63 #include <machine/md_var.h>
   64 #include <machine/pcb.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/vm_extern.h>
   68 #include <vm/pmap.h>
   69 #include <vm/vm_kern.h>
   70 #include <vm/vm_map.h>
   71 #include <vm/vm_page.h>
   72 #include <vm/vm_pageout.h>
   73 #include <vm/vm_param.h>
   74 #include <vm/uma.h>
   75 #include <vm/uma_int.h>
   76 
   77 #include <sys/user.h>
   78 #include <sys/mbuf.h>
   79 #include <sys/sf_buf.h>
   80 
   81 #ifndef NSFBUFS
   82 #define NSFBUFS         (512 + maxusers * 16)
   83 #endif
   84 
   85 static void     sf_buf_init(void *arg);
   86 SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL);
   87 
   88 /*
   89  * Expanded sf_freelist head.  Really an SLIST_HEAD() in disguise, with the
   90  * sf_freelist head with the sf_lock mutex.
   91  */
   92 static struct {
   93         SLIST_HEAD(, sf_buf) sf_head;
   94         struct mtx sf_lock;
   95 } sf_freelist;
   96 
   97 static u_int    sf_buf_alloc_want;
   98 
   99 /*
  100  * Finish a fork operation, with process p2 nearly set up.
  101  * Copy and update the pcb, set up the stack so that the child
  102  * ready to run and return to user mode.
  103  */
  104 void
  105 cpu_fork(register struct thread *td1,register struct proc *p2,
  106     struct thread *td2,int flags)
  107 {
  108         register struct proc *p1;
  109         struct pcb *pcb2;
  110 
  111         p1 = td1->td_proc;
  112         if ((flags & RFPROC) == 0)
  113                 return;
  114         /* It is assumed that the vm_thread_alloc called
  115          * cpu_thread_alloc() before cpu_fork is called.
  116          */
  117 
  118         /* Point the pcb to the top of the stack */
  119         pcb2 = td2->td_pcb;
  120 
  121         /* Copy p1's pcb, note that in this case
  122          * our pcb also includes the td_frame being copied
  123          * too. The older mips2 code did an additional copy
  124          * of the td_frame, for us that's not needed any
  125          * longer (this copy does them both) 
  126          */
  127         bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
  128 
  129         /* Point mdproc and then copy over td1's contents
  130          * md_proc is empty for MIPS
  131          */
  132         td2->td_md.md_flags = td1->td_md.md_flags & MDTD_FPUSED;
  133 
  134         /*
  135          * Set up return-value registers as fork() libc stub expects.
  136          */
  137         td2->td_frame->v0 = 0;
  138         td2->td_frame->v1 = 1;
  139         td2->td_frame->a3 = 0;
  140 
  141         if (td1 == PCPU_GET(fpcurthread))
  142                 MipsSaveCurFPState(td1);
  143 
  144         pcb2->pcb_context[PCB_REG_RA] = (register_t)(intptr_t)fork_trampoline;
  145         /* Make sp 64-bit aligned */
  146         pcb2->pcb_context[PCB_REG_SP] = (register_t)(((vm_offset_t)td2->td_pcb &
  147             ~(sizeof(__int64_t) - 1)) - CALLFRAME_SIZ);
  148         pcb2->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)fork_return;
  149         pcb2->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)td2;
  150         pcb2->pcb_context[PCB_REG_S2] = (register_t)(intptr_t)td2->td_frame;
  151         pcb2->pcb_context[PCB_REG_SR] = mips_rd_status() &
  152             (MIPS_SR_KX | MIPS_SR_UX | MIPS_SR_INT_MASK);
  153         /*
  154          * FREEBSD_DEVELOPERS_FIXME:
  155          * Setup any other CPU-Specific registers (Not MIPS Standard)
  156          * and/or bits in other standard MIPS registers (if CPU-Specific)
  157          *  that are needed.
  158          */
  159 
  160         td2->td_md.md_tls = td1->td_md.md_tls;
  161         td2->td_md.md_saved_intr = MIPS_SR_INT_IE;
  162         td2->td_md.md_spinlock_count = 1;
  163 #ifdef CPU_CNMIPS
  164         pcb2->pcb_context[PCB_REG_SR] |= MIPS_SR_COP_2_BIT | MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX;
  165 #endif
  166 }
  167 
  168 /*
  169  * Intercept the return address from a freshly forked process that has NOT
  170  * been scheduled yet.
  171  *
  172  * This is needed to make kernel threads stay in kernel mode.
  173  */
  174 void
  175 cpu_set_fork_handler(struct thread *td, void (*func) __P((void *)), void *arg)
  176 {
  177         /*
  178          * Note that the trap frame follows the args, so the function
  179          * is really called like this:  func(arg, frame);
  180          */
  181         td->td_pcb->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)func;
  182         td->td_pcb->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)arg;
  183 }
  184 
  185 void
  186 cpu_exit(struct thread *td)
  187 {
  188 }
  189 
  190 void
  191 cpu_thread_exit(struct thread *td)
  192 {
  193 
  194         if (PCPU_GET(fpcurthread) == td)
  195                 PCPU_GET(fpcurthread) = (struct thread *)0;
  196 }
  197 
  198 void
  199 cpu_thread_free(struct thread *td)
  200 {
  201 }
  202 
  203 void
  204 cpu_thread_clean(struct thread *td)
  205 {
  206 }
  207 
  208 void
  209 cpu_thread_swapin(struct thread *td)
  210 {
  211         pt_entry_t *pte;
  212         int i;
  213 
  214         /*
  215          * The kstack may be at a different physical address now.
  216          * Cache the PTEs for the Kernel stack in the machine dependent
  217          * part of the thread struct so cpu_switch() can quickly map in
  218          * the pcb struct and kernel stack.
  219          */
  220         for (i = 0; i < KSTACK_PAGES; i++) {
  221                 pte = pmap_pte(kernel_pmap, td->td_kstack + i * PAGE_SIZE);
  222                 td->td_md.md_upte[i] = *pte & ~TLBLO_SWBITS_MASK;
  223         }
  224 }
  225 
  226 void
  227 cpu_thread_swapout(struct thread *td)
  228 {
  229 }
  230 
  231 void
  232 cpu_thread_alloc(struct thread *td)
  233 {
  234         pt_entry_t *pte;
  235         int i;
  236 
  237         KASSERT((td->td_kstack & (1 << PAGE_SHIFT)) == 0, ("kernel stack must be aligned."));
  238         td->td_pcb = (struct pcb *)(td->td_kstack +
  239             td->td_kstack_pages * PAGE_SIZE) - 1;
  240         td->td_frame = &td->td_pcb->pcb_regs;
  241 
  242         for (i = 0; i < KSTACK_PAGES; i++) {
  243                 pte = pmap_pte(kernel_pmap, td->td_kstack + i * PAGE_SIZE);
  244                 td->td_md.md_upte[i] = *pte & ~TLBLO_SWBITS_MASK;
  245         }
  246 }
  247 
  248 void
  249 cpu_set_syscall_retval(struct thread *td, int error)
  250 {
  251         struct trapframe *locr0 = td->td_frame;
  252         unsigned int code;
  253         int quad_syscall;
  254 
  255         code = locr0->v0;
  256         quad_syscall = 0;
  257 #if defined(__mips_o32)
  258         if (code == SYS___syscall)
  259                 quad_syscall = 1;
  260 #endif
  261 
  262         if (code == SYS_syscall)
  263                 code = locr0->a0;
  264         else if (code == SYS___syscall) {
  265                 if (quad_syscall)
  266                         code = _QUAD_LOWWORD ? locr0->a1 : locr0->a0;
  267                 else
  268                         code = locr0->a0;
  269         }
  270 
  271         switch (error) {
  272         case 0:
  273                 if (quad_syscall && code != SYS_lseek) {
  274                         /*
  275                          * System call invoked through the
  276                          * SYS___syscall interface but the
  277                          * return value is really just 32
  278                          * bits.
  279                          */
  280                         locr0->v0 = td->td_retval[0];
  281                         if (_QUAD_LOWWORD)
  282                                 locr0->v1 = td->td_retval[0];
  283                         locr0->a3 = 0;
  284                 } else {
  285                         locr0->v0 = td->td_retval[0];
  286                         locr0->v1 = td->td_retval[1];
  287                         locr0->a3 = 0;
  288                 }
  289                 break;
  290 
  291         case ERESTART:
  292                 locr0->pc = td->td_pcb->pcb_tpc;
  293                 break;
  294 
  295         case EJUSTRETURN:
  296                 break;  /* nothing to do */
  297 
  298         default:
  299                 if (quad_syscall && code != SYS_lseek) {
  300                         locr0->v0 = error;
  301                         if (_QUAD_LOWWORD)
  302                                 locr0->v1 = error;
  303                         locr0->a3 = 1;
  304                 } else {
  305                         locr0->v0 = error;
  306                         locr0->a3 = 1;
  307                 }
  308         }
  309 }
  310 
  311 /*
  312  * Initialize machine state (pcb and trap frame) for a new thread about to
  313  * upcall. Put enough state in the new thread's PCB to get it to go back
  314  * userret(), where we can intercept it again to set the return (upcall)
  315  * Address and stack, along with those from upcalls that are from other sources
  316  * such as those generated in thread_userret() itself.
  317  */
  318 void
  319 cpu_set_upcall(struct thread *td, struct thread *td0)
  320 {
  321         struct pcb *pcb2;
  322 
  323         /* Point the pcb to the top of the stack. */
  324         pcb2 = td->td_pcb;
  325 
  326         /*
  327          * Copy the upcall pcb.  This loads kernel regs.
  328          * Those not loaded individually below get their default
  329          * values here.
  330          *
  331          * XXXKSE It might be a good idea to simply skip this as
  332          * the values of the other registers may be unimportant.
  333          * This would remove any requirement for knowing the KSE
  334          * at this time (see the matching comment below for
  335          * more analysis) (need a good safe default).
  336          * In MIPS, the trapframe is the first element of the PCB
  337          * and gets copied when we copy the PCB. No separate copy
  338          * is needed.
  339          */
  340         bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
  341 
  342         /*
  343          * Set registers for trampoline to user mode.
  344          */
  345 
  346         pcb2->pcb_context[PCB_REG_RA] = (register_t)(intptr_t)fork_trampoline;
  347         /* Make sp 64-bit aligned */
  348         pcb2->pcb_context[PCB_REG_SP] = (register_t)(((vm_offset_t)td->td_pcb &
  349             ~(sizeof(__int64_t) - 1)) - CALLFRAME_SIZ);
  350         pcb2->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)fork_return;
  351         pcb2->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)td;
  352         pcb2->pcb_context[PCB_REG_S2] = (register_t)(intptr_t)td->td_frame;
  353         /* Dont set IE bit in SR. sched lock release will take care of it */
  354         pcb2->pcb_context[PCB_REG_SR] = mips_rd_status() &
  355             (MIPS_SR_KX | MIPS_SR_UX | MIPS_SR_INT_MASK);
  356 
  357 #ifdef CPU_CNMIPS
  358         pcb2->pcb_context[PCB_REG_SR] |= MIPS_SR_COP_2_BIT | MIPS_SR_COP_0_BIT |
  359           MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX;
  360 #endif
  361 
  362         /*
  363          * FREEBSD_DEVELOPERS_FIXME:
  364          * Setup any other CPU-Specific registers (Not MIPS Standard)
  365          * that are needed.
  366          */
  367 
  368         /* SMP Setup to release sched_lock in fork_exit(). */
  369         td->td_md.md_spinlock_count = 1;
  370         td->td_md.md_saved_intr = MIPS_SR_INT_IE;
  371 #if 0
  372             /* Maybe we need to fix this? */
  373         td->td_md.md_saved_sr = ( (MIPS_SR_COP_2_BIT | MIPS_SR_COP_0_BIT) |
  374                                   (MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX) |
  375                                   (MIPS_SR_INT_IE | MIPS_HARD_INT_MASK));
  376 #endif
  377 }
  378 
  379 /*
  380  * Set that machine state for performing an upcall that has to
  381  * be done in thread_userret() so that those upcalls generated
  382  * in thread_userret() itself can be done as well.
  383  */
  384 void
  385 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
  386     stack_t *stack)
  387 {
  388         struct trapframe *tf;
  389         register_t sp;
  390 
  391         /*
  392         * At the point where a function is called, sp must be 8
  393         * byte aligned[for compatibility with 64-bit CPUs]
  394         * in ``See MIPS Run'' by D. Sweetman, p. 269
  395         * align stack */
  396         sp = ((register_t)(intptr_t)(stack->ss_sp + stack->ss_size) & ~0x7) -
  397             CALLFRAME_SIZ;
  398 
  399         /*
  400          * Set the trap frame to point at the beginning of the uts
  401          * function.
  402          */
  403         tf = td->td_frame;
  404         bzero(tf, sizeof(struct trapframe));
  405         tf->sp = sp;
  406         tf->pc = (register_t)(intptr_t)entry;
  407         /* 
  408          * MIPS ABI requires T9 to be the same as PC 
  409          * in subroutine entry point
  410          */
  411         tf->t9 = (register_t)(intptr_t)entry; 
  412         tf->a0 = (register_t)(intptr_t)arg;
  413 
  414         /*
  415          * Keep interrupt mask
  416          */
  417         td->td_frame->sr = MIPS_SR_KSU_USER | MIPS_SR_EXL | MIPS_SR_INT_IE |
  418             (mips_rd_status() & MIPS_SR_INT_MASK);
  419 #if defined(__mips_n32) 
  420         td->td_frame->sr |= MIPS_SR_PX;
  421 #elif  defined(__mips_n64)
  422         td->td_frame->sr |= MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX;
  423 #endif
  424 #ifdef CPU_CNMIPS
  425         tf->sr |=  MIPS_SR_INT_IE | MIPS_SR_COP_0_BIT | MIPS_SR_PX | MIPS_SR_UX |
  426           MIPS_SR_KX;
  427 #endif
  428 /*      tf->sr |= (ALL_INT_MASK & idle_mask) | SR_INT_ENAB; */
  429         /**XXX the above may now be wrong -- mips2 implements this as panic */
  430         /*
  431          * FREEBSD_DEVELOPERS_FIXME:
  432          * Setup any other CPU-Specific registers (Not MIPS Standard)
  433          * that are needed.
  434          */
  435 }
  436 /*
  437  * Convert kernel VA to physical address
  438  */
  439 u_long
  440 kvtop(void *addr)
  441 {
  442         vm_offset_t va;
  443 
  444         va = pmap_kextract((vm_offset_t)addr);
  445         if (va == 0)
  446                 panic("kvtop: zero page frame");
  447         return((intptr_t)va);
  448 }
  449 
  450 /*
  451  * Implement the pre-zeroed page mechanism.
  452  * This routine is called from the idle loop.
  453  */
  454 
  455 #define ZIDLE_LO(v)     ((v) * 2 / 3)
  456 #define ZIDLE_HI(v)     ((v) * 4 / 5)
  457 
  458 /*
  459  * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
  460  */
  461 static void
  462 sf_buf_init(void *arg)
  463 {
  464         struct sf_buf *sf_bufs;
  465         vm_offset_t sf_base;
  466         int i;
  467 
  468         nsfbufs = NSFBUFS;
  469         TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs);
  470 
  471         mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
  472         SLIST_INIT(&sf_freelist.sf_head);
  473         sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
  474         sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
  475             M_NOWAIT | M_ZERO);
  476         for (i = 0; i < nsfbufs; i++) {
  477                 sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
  478                 SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
  479         }
  480         sf_buf_alloc_want = 0;
  481 }
  482 
  483 /*
  484  * Get an sf_buf from the freelist.  Will block if none are available.
  485  */
  486 struct sf_buf *
  487 sf_buf_alloc(struct vm_page *m, int flags)
  488 {
  489         struct sf_buf *sf;
  490         int error;
  491 
  492         mtx_lock(&sf_freelist.sf_lock);
  493         while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
  494                 if (flags & SFB_NOWAIT)
  495                         break;
  496                 sf_buf_alloc_want++;
  497                 mbstat.sf_allocwait++;
  498                 error = msleep(&sf_freelist, &sf_freelist.sf_lock,
  499                     (flags & SFB_CATCH) ? PCATCH | PVM : PVM, "sfbufa", 0);
  500                 sf_buf_alloc_want--;
  501 
  502                 /*
  503                  * If we got a signal, don't risk going back to sleep.
  504                  */
  505                 if (error)
  506                         break;
  507         }
  508         if (sf != NULL) {
  509                 SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
  510                 sf->m = m;
  511                 nsfbufsused++;
  512                 nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
  513                 pmap_qenter(sf->kva, &sf->m, 1);
  514         }
  515         mtx_unlock(&sf_freelist.sf_lock);
  516         return (sf);
  517 }
  518 
  519 /*
  520  * Release resources back to the system.
  521  */
  522 void
  523 sf_buf_free(struct sf_buf *sf)
  524 {
  525 
  526         pmap_qremove(sf->kva, 1);
  527         mtx_lock(&sf_freelist.sf_lock);
  528         SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
  529         nsfbufsused--;
  530         if (sf_buf_alloc_want > 0)
  531                 wakeup(&sf_freelist);
  532         mtx_unlock(&sf_freelist.sf_lock);
  533 }
  534 
  535 /*
  536  * Software interrupt handler for queued VM system processing.
  537  */
  538 void
  539 swi_vm(void *dummy)
  540 {
  541 }
  542 
  543 int
  544 cpu_set_user_tls(struct thread *td, void *tls_base)
  545 {
  546 
  547         td->td_md.md_tls = tls_base;
  548         return (0);
  549 }
  550 
  551 #ifdef DDB
  552 #include <ddb/ddb.h>
  553 
  554 #define DB_PRINT_REG(ptr, regname)                      \
  555         db_printf("  %-12s %p\n", #regname, (void *)(intptr_t)((ptr)->regname))
  556 
  557 #define DB_PRINT_REG_ARRAY(ptr, arrname, regname)       \
  558         db_printf("  %-12s %p\n", #regname, (void *)(intptr_t)((ptr)->arrname[regname]))
  559 
  560 static void
  561 dump_trapframe(struct trapframe *trapframe)
  562 {
  563 
  564         db_printf("Trapframe at %p\n", trapframe);
  565 
  566         DB_PRINT_REG(trapframe, zero);
  567         DB_PRINT_REG(trapframe, ast);
  568         DB_PRINT_REG(trapframe, v0);
  569         DB_PRINT_REG(trapframe, v1);
  570         DB_PRINT_REG(trapframe, a0);
  571         DB_PRINT_REG(trapframe, a1);
  572         DB_PRINT_REG(trapframe, a2);
  573         DB_PRINT_REG(trapframe, a3);
  574         DB_PRINT_REG(trapframe, t0);
  575         DB_PRINT_REG(trapframe, t1);
  576         DB_PRINT_REG(trapframe, t2);
  577         DB_PRINT_REG(trapframe, t3);
  578         DB_PRINT_REG(trapframe, t4);
  579         DB_PRINT_REG(trapframe, t5);
  580         DB_PRINT_REG(trapframe, t6);
  581         DB_PRINT_REG(trapframe, t7);
  582         DB_PRINT_REG(trapframe, s0);
  583         DB_PRINT_REG(trapframe, s1);
  584         DB_PRINT_REG(trapframe, s2);
  585         DB_PRINT_REG(trapframe, s3);
  586         DB_PRINT_REG(trapframe, s4);
  587         DB_PRINT_REG(trapframe, s5);
  588         DB_PRINT_REG(trapframe, s6);
  589         DB_PRINT_REG(trapframe, s7);
  590         DB_PRINT_REG(trapframe, t8);
  591         DB_PRINT_REG(trapframe, t9);
  592         DB_PRINT_REG(trapframe, k0);
  593         DB_PRINT_REG(trapframe, k1);
  594         DB_PRINT_REG(trapframe, gp);
  595         DB_PRINT_REG(trapframe, sp);
  596         DB_PRINT_REG(trapframe, s8);
  597         DB_PRINT_REG(trapframe, ra);
  598         DB_PRINT_REG(trapframe, sr);
  599         DB_PRINT_REG(trapframe, mullo);
  600         DB_PRINT_REG(trapframe, mulhi);
  601         DB_PRINT_REG(trapframe, badvaddr);
  602         DB_PRINT_REG(trapframe, cause);
  603         DB_PRINT_REG(trapframe, pc);
  604 }
  605 
  606 DB_SHOW_COMMAND(pcb, ddb_dump_pcb)
  607 {
  608         struct thread *td;
  609         struct pcb *pcb;
  610         struct trapframe *trapframe;
  611 
  612         /* Determine which thread to examine. */
  613         if (have_addr)
  614                 td = db_lookup_thread(addr, TRUE);
  615         else
  616                 td = curthread;
  617         
  618         pcb = td->td_pcb;
  619 
  620         db_printf("Thread %d at %p\n", td->td_tid, td);
  621 
  622         db_printf("PCB at %p\n", pcb);
  623 
  624         trapframe = &pcb->pcb_regs;
  625         dump_trapframe(trapframe);
  626 
  627         db_printf("PCB Context:\n");
  628         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S0);
  629         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S1);
  630         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S2);
  631         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S3);
  632         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S4);
  633         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S5);
  634         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S6);
  635         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S7);
  636         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_SP);
  637         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S8);
  638         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_RA);
  639         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_SR);
  640         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_GP);
  641         DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_PC);
  642 
  643         db_printf("PCB onfault = %p\n", pcb->pcb_onfault);
  644         db_printf("md_saved_intr = 0x%0lx\n", (long)td->td_md.md_saved_intr);
  645         db_printf("md_spinlock_count = %d\n", td->td_md.md_spinlock_count);
  646 
  647         if (td->td_frame != trapframe) {
  648                 db_printf("td->td_frame %p is not the same as pcb_regs %p\n",
  649                           td->td_frame, trapframe);
  650         }
  651 }
  652 
  653 /*
  654  * Dump the trapframe beginning at address specified by first argument.
  655  */
  656 DB_SHOW_COMMAND(trapframe, ddb_dump_trapframe)
  657 {
  658         
  659         if (!have_addr)
  660                 return;
  661 
  662         dump_trapframe((struct trapframe *)addr);
  663 }
  664 
  665 #endif  /* DDB */

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