The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/machdep.c

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    1 /*-
    2  * Copyright (c) 2001 Jake Burkholder.
    3  * Copyright (c) 1992 Terrence R. Lambert.
    4  * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)machdep.c     7.4 (Berkeley) 6/3/91
   35  *      from: FreeBSD: src/sys/i386/i386/machdep.c,v 1.477 2001/08/27
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_compat.h"
   42 #include "opt_ddb.h"
   43 #include "opt_kstack_pages.h"
   44 #include "opt_msgbuf.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/malloc.h>
   48 #include <sys/proc.h>
   49 #include <sys/systm.h>
   50 #include <sys/bio.h>
   51 #include <sys/buf.h>
   52 #include <sys/bus.h>
   53 #include <sys/cpu.h>
   54 #include <sys/cons.h>
   55 #include <sys/eventhandler.h>
   56 #include <sys/exec.h>
   57 #include <sys/imgact.h>
   58 #include <sys/interrupt.h>
   59 #include <sys/kdb.h>
   60 #include <sys/kernel.h>
   61 #include <sys/ktr.h>
   62 #include <sys/linker.h>
   63 #include <sys/lock.h>
   64 #include <sys/msgbuf.h>
   65 #include <sys/mutex.h>
   66 #include <sys/pcpu.h>
   67 #include <sys/ptrace.h>
   68 #include <sys/reboot.h>
   69 #include <sys/signalvar.h>
   70 #include <sys/smp.h>
   71 #include <sys/sysent.h>
   72 #include <sys/sysproto.h>
   73 #include <sys/timetc.h>
   74 #include <sys/ucontext.h>
   75 
   76 #include <dev/ofw/openfirm.h>
   77 
   78 #include <vm/vm.h>
   79 #include <vm/vm_extern.h>
   80 #include <vm/vm_kern.h>
   81 #include <vm/vm_page.h>
   82 #include <vm/vm_map.h>
   83 #include <vm/vm_object.h>
   84 #include <vm/vm_pager.h>
   85 #include <vm/vm_param.h>
   86 
   87 #include <ddb/ddb.h>
   88 
   89 #include <machine/bus.h>
   90 #include <machine/cache.h>
   91 #include <machine/clock.h>
   92 #include <machine/cpu.h>
   93 #include <machine/fp.h>
   94 #include <machine/fsr.h>
   95 #include <machine/intr_machdep.h>
   96 #include <machine/md_var.h>
   97 #include <machine/metadata.h>
   98 #include <machine/ofw_machdep.h>
   99 #include <machine/ofw_mem.h>
  100 #include <machine/pcb.h>
  101 #include <machine/pmap.h>
  102 #include <machine/pstate.h>
  103 #include <machine/reg.h>
  104 #include <machine/sigframe.h>
  105 #include <machine/smp.h>
  106 #include <machine/tick.h>
  107 #include <machine/tlb.h>
  108 #include <machine/tstate.h>
  109 #include <machine/upa.h>
  110 #include <machine/ver.h>
  111 
  112 typedef int ofw_vec_t(void *);
  113 
  114 #ifdef DDB
  115 extern vm_offset_t ksym_start, ksym_end;
  116 #endif
  117 
  118 struct tlb_entry *kernel_tlbs;
  119 int kernel_tlb_slots;
  120 
  121 int cold = 1;
  122 long Maxmem;
  123 long realmem;
  124 
  125 char pcpu0[PCPU_PAGES * PAGE_SIZE];
  126 struct trapframe frame0;
  127 
  128 vm_offset_t kstack0;
  129 vm_paddr_t kstack0_phys;
  130 
  131 struct kva_md_info kmi;
  132 
  133 u_long ofw_vec;
  134 u_long ofw_tba;
  135 
  136 /*
  137  * Note: timer quality for CPU's is set low to try and prevent them from
  138  * being chosen as the primary timecounter.  The CPU counters are not
  139  * synchronized among the CPU's so in MP machines this causes problems
  140  * when calculating the time.  With this value the CPU's should only be
  141  * chosen as the primary timecounter as a last resort.
  142  */
  143 
  144 #define UP_TICK_QUALITY 1000
  145 #define MP_TICK_QUALITY -100
  146 static struct timecounter tick_tc;
  147 
  148 char sparc64_model[32];
  149 
  150 static int cpu_use_vis = 1;
  151 
  152 cpu_block_copy_t *cpu_block_copy;
  153 cpu_block_zero_t *cpu_block_zero;
  154 
  155 static timecounter_get_t tick_get_timecount;
  156 void sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3,
  157     ofw_vec_t *vec);
  158 void sparc64_shutdown_final(void *dummy, int howto);
  159 
  160 static void cpu_startup(void *);
  161 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
  162 
  163 CTASSERT((1 << INT_SHIFT) == sizeof(int));
  164 CTASSERT((1 << PTR_SHIFT) == sizeof(char *));
  165 
  166 CTASSERT(sizeof(struct reg) == 256);
  167 CTASSERT(sizeof(struct fpreg) == 272);
  168 CTASSERT(sizeof(struct __mcontext) == 512);
  169 
  170 CTASSERT((sizeof(struct pcb) & (64 - 1)) == 0);
  171 CTASSERT((offsetof(struct pcb, pcb_kfp) & (64 - 1)) == 0);
  172 CTASSERT((offsetof(struct pcb, pcb_ufp) & (64 - 1)) == 0);
  173 CTASSERT(sizeof(struct pcb) <= ((KSTACK_PAGES * PAGE_SIZE) / 8));
  174 
  175 CTASSERT(sizeof(struct pcpu) <= ((PCPU_PAGES * PAGE_SIZE) / 2));
  176 
  177 static void
  178 cpu_startup(void *arg)
  179 {
  180         vm_paddr_t physsz;
  181         int i;
  182 
  183         tick_tc.tc_get_timecount = tick_get_timecount;
  184         tick_tc.tc_poll_pps = NULL;
  185         tick_tc.tc_counter_mask = ~0u;
  186         tick_tc.tc_frequency = tick_freq;
  187         tick_tc.tc_name = "tick";
  188         tick_tc.tc_quality = UP_TICK_QUALITY;
  189 #ifdef SMP
  190         /*
  191          * We do not know if each CPU's tick counter is synchronized.
  192          */
  193         if (cpu_mp_probe())
  194                 tick_tc.tc_quality = MP_TICK_QUALITY;
  195 #endif
  196 
  197         tc_init(&tick_tc);
  198 
  199         physsz = 0;
  200         for (i = 0; i < sparc64_nmemreg; i++)
  201                 physsz += sparc64_memreg[i].mr_size;
  202         printf("real memory  = %lu (%lu MB)\n", physsz,
  203             physsz / (1024 * 1024));
  204         realmem = (long)physsz / PAGE_SIZE;
  205 
  206         vm_ksubmap_init(&kmi);
  207 
  208         bufinit();
  209         vm_pager_bufferinit();
  210 
  211         EVENTHANDLER_REGISTER(shutdown_final, sparc64_shutdown_final, NULL,
  212             SHUTDOWN_PRI_LAST);
  213 
  214         printf("avail memory = %lu (%lu MB)\n", cnt.v_free_count * PAGE_SIZE,
  215             cnt.v_free_count / ((1024 * 1024) / PAGE_SIZE));
  216 
  217         if (bootverbose)
  218                 printf("machine: %s\n", sparc64_model);
  219 
  220         cpu_identify(rdpr(ver), tick_freq, PCPU_GET(cpuid));
  221 }
  222 
  223 void
  224 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
  225 {
  226         struct intr_request *ir;
  227         int i;
  228 
  229         pcpu->pc_irtail = &pcpu->pc_irhead;
  230         for (i = 0; i < IR_FREE; i++) {
  231                 ir = &pcpu->pc_irpool[i];
  232                 ir->ir_next = pcpu->pc_irfree;
  233                 pcpu->pc_irfree = ir;
  234         }
  235 }
  236 
  237 void
  238 spinlock_enter(void)
  239 {
  240         struct thread *td;
  241         register_t pil;
  242 
  243         td = curthread;
  244         if (td->td_md.md_spinlock_count == 0) {
  245                 pil = rdpr(pil);
  246                 wrpr(pil, 0, PIL_TICK);
  247                 td->td_md.md_saved_pil = pil;
  248         }
  249         td->td_md.md_spinlock_count++;
  250         critical_enter();
  251 }
  252 
  253 void
  254 spinlock_exit(void)
  255 {
  256         struct thread *td;
  257 
  258         td = curthread;
  259         critical_exit();
  260         td->td_md.md_spinlock_count--;
  261         if (td->td_md.md_spinlock_count == 0)
  262                 wrpr(pil, td->td_md.md_saved_pil, 0);
  263 }
  264 
  265 unsigned
  266 tick_get_timecount(struct timecounter *tc)
  267 {
  268         return ((unsigned)rd(tick));
  269 }
  270 
  271 void
  272 sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3, ofw_vec_t *vec)
  273 {
  274         char type[8];
  275         char *env;
  276         struct pcpu *pc;
  277         vm_offset_t end;
  278         caddr_t kmdp;
  279         phandle_t child;
  280         phandle_t root;
  281         u_int clock;
  282 
  283         end = 0;
  284         kmdp = NULL;
  285 
  286         /*
  287          * Find out what kind of CPU we have first, for anything that changes
  288          * behaviour.
  289          */
  290         cpu_impl = VER_IMPL(rdpr(ver));
  291 
  292         /*
  293          * Initialize Open Firmware (needed for console).
  294          */
  295         OF_init(vec);
  296 
  297         /*
  298          * Parse metadata if present and fetch parameters.  Must be before the
  299          * console is inited so cninit gets the right value of boothowto.
  300          */
  301         if (mdp != NULL) {
  302                 preload_metadata = mdp;
  303                 kmdp = preload_search_by_type("elf kernel");
  304                 if (kmdp != NULL) {
  305                         boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
  306                         kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
  307                         end = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
  308                         kernel_tlb_slots = MD_FETCH(kmdp, MODINFOMD_DTLB_SLOTS,
  309                             int);
  310                         kernel_tlbs = (void *)preload_search_info(kmdp,
  311                             MODINFO_METADATA | MODINFOMD_DTLB);
  312                 }
  313         }
  314 
  315         init_param1();
  316 
  317         root = OF_peer(0);
  318         for (child = OF_child(root); child != 0; child = OF_peer(child)) {
  319                 OF_getprop(child, "device_type", type, sizeof(type));
  320                 if (strcmp(type, "cpu") == 0)
  321                         break;
  322         }
  323 
  324         /*
  325          * Initialize the tick counter.  Must be before the console is inited
  326          * in order to provide the low-level console drivers with a working
  327          * DELAY().
  328          */
  329         OF_getprop(child, "clock-frequency", &clock, sizeof(clock));
  330         tick_init(clock);
  331 
  332         /*
  333          * Initialize the console before printing anything.
  334          */
  335         cninit();
  336 
  337         /*
  338          * Panic if there is no metadata.  Most likely the kernel was booted
  339          * directly, instead of through loader(8).
  340          */
  341         if (mdp == NULL || kmdp == NULL) {
  342                 printf("sparc64_init: no loader metadata.\n"
  343                     "This probably means you are not using loader(8).\n");
  344                 panic("sparc64_init");
  345         }
  346 
  347         /*
  348          * Sanity check the kernel end, which is important.
  349          */
  350         if (end == 0) {
  351                 printf("sparc64_init: warning, kernel end not specified.\n"
  352                     "Attempting to continue anyway.\n");
  353                 end = (vm_offset_t)_end;
  354         }
  355 
  356         cache_init(child);
  357         uma_set_align(cache.dc_linesize - 1);
  358 
  359         cpu_block_copy = bcopy;
  360         cpu_block_zero = bzero;
  361         getenv_int("machdep.use_vis", &cpu_use_vis);
  362         if (cpu_use_vis) {
  363                 switch (cpu_impl) {
  364                 case CPU_IMPL_SPARC64:
  365                 case CPU_IMPL_ULTRASPARCI:
  366                 case CPU_IMPL_ULTRASPARCII:
  367                 case CPU_IMPL_ULTRASPARCIIi:
  368                 case CPU_IMPL_ULTRASPARCIIe:
  369                         cpu_block_copy = spitfire_block_copy;
  370                         cpu_block_zero = spitfire_block_zero;
  371                         break;
  372                 }
  373         }
  374 
  375 #ifdef SMP
  376         mp_init();
  377 #endif
  378 
  379         /*
  380          * Initialize virtual memory and calculate physmem.
  381          */
  382         pmap_bootstrap(end);
  383 
  384         /*
  385          * Initialize tunables.
  386          */
  387         init_param2(physmem);
  388         env = getenv("kernelname");
  389         if (env != NULL) {
  390                 strlcpy(kernelname, env, sizeof(kernelname));
  391                 freeenv(env);
  392         }
  393 
  394         /*
  395          * Initialize the interrupt tables.
  396          */
  397         intr_init1();
  398 
  399         /*
  400          * Initialize proc0 stuff (p_contested needs to be done early).
  401          */
  402         proc_linkup0(&proc0, &thread0);
  403         proc0.p_md.md_sigtramp = NULL;
  404         proc0.p_md.md_utrap = NULL;
  405         thread0.td_kstack = kstack0;
  406         thread0.td_pcb = (struct pcb *)
  407             (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
  408         frame0.tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_PRIV;
  409         thread0.td_frame = &frame0;
  410 
  411         /*
  412          * Prime our per-cpu data page for use.  Note, we are using it for our
  413          * stack, so don't pass the real size (PAGE_SIZE) to pcpu_init or
  414          * it'll zero it out from under us.
  415          */
  416         pc = (struct pcpu *)(pcpu0 + (PCPU_PAGES * PAGE_SIZE)) - 1;
  417         pcpu_init(pc, 0, sizeof(struct pcpu));
  418         pc->pc_curthread = &thread0;
  419         pc->pc_curpcb = thread0.td_pcb;
  420         pc->pc_mid = UPA_CR_GET_MID(ldxa(0, ASI_UPA_CONFIG_REG));
  421         pc->pc_addr = (vm_offset_t)pcpu0;
  422         pc->pc_node = child;
  423         pc->pc_tlb_ctx = TLB_CTX_USER_MIN;
  424         pc->pc_tlb_ctx_min = TLB_CTX_USER_MIN;
  425         pc->pc_tlb_ctx_max = TLB_CTX_USER_MAX;
  426 
  427         /*
  428          * Initialize global registers.
  429          */
  430         cpu_setregs(pc);
  431 
  432         /*
  433          * Initialize the message buffer (after setting trap table).
  434          */
  435         msgbufinit(msgbufp, MSGBUF_SIZE);
  436 
  437         mutex_init();
  438         intr_init2();
  439 
  440         /*
  441          * Finish pmap initialization now that we're ready for mutexes.
  442          */
  443         PMAP_LOCK_INIT(kernel_pmap);
  444 
  445         OF_getprop(root, "name", sparc64_model, sizeof(sparc64_model) - 1);
  446 
  447         kdb_init();
  448 
  449 #ifdef KDB
  450         if (boothowto & RB_KDB)
  451                 kdb_enter_why(KDB_WHY_BOOTFLAGS,
  452                     "Boot flags requested debugger");
  453 #endif
  454 }
  455 
  456 void
  457 set_openfirm_callback(ofw_vec_t *vec)
  458 {
  459 
  460         ofw_tba = rdpr(tba);
  461         ofw_vec = (u_long)vec;
  462 }
  463 
  464 void
  465 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  466 {
  467         struct trapframe *tf;
  468         struct sigframe *sfp;
  469         struct sigacts *psp;
  470         struct sigframe sf;
  471         struct thread *td;
  472         struct frame *fp;
  473         struct proc *p;
  474         u_long sp;
  475         int oonstack;
  476         int sig;
  477 
  478         oonstack = 0;
  479         td = curthread;
  480         p = td->td_proc;
  481         PROC_LOCK_ASSERT(p, MA_OWNED);
  482         sig = ksi->ksi_signo;
  483         psp = p->p_sigacts;
  484         mtx_assert(&psp->ps_mtx, MA_OWNED);
  485         tf = td->td_frame;
  486         sp = tf->tf_sp + SPOFF;
  487         oonstack = sigonstack(sp);
  488 
  489         CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
  490             catcher, sig);
  491 
  492         /* Make sure we have a signal trampoline to return to. */
  493         if (p->p_md.md_sigtramp == NULL) {
  494                 /*
  495                  * No signal trampoline... kill the process.
  496                  */
  497                 CTR0(KTR_SIG, "sendsig: no sigtramp");
  498                 printf("sendsig: %s is too old, rebuild it\n", p->p_comm);
  499                 sigexit(td, sig);
  500                 /* NOTREACHED */
  501         }
  502 
  503         /* Save user context. */
  504         bzero(&sf, sizeof(sf));
  505         get_mcontext(td, &sf.sf_uc.uc_mcontext, 0);
  506         sf.sf_uc.uc_sigmask = *mask;
  507         sf.sf_uc.uc_stack = td->td_sigstk;
  508         sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ?
  509             ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
  510 
  511         /* Allocate and validate space for the signal handler context. */
  512         if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
  513             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  514                 sfp = (struct sigframe *)(td->td_sigstk.ss_sp +
  515                     td->td_sigstk.ss_size - sizeof(struct sigframe));
  516         } else
  517                 sfp = (struct sigframe *)sp - 1;
  518         mtx_unlock(&psp->ps_mtx);
  519         PROC_UNLOCK(p);
  520 
  521         fp = (struct frame *)sfp - 1;
  522 
  523         /* Translate the signal if appropriate. */
  524         if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
  525                 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
  526 
  527         /* Build the argument list for the signal handler. */
  528         tf->tf_out[0] = sig;
  529         tf->tf_out[2] = (register_t)&sfp->sf_uc;
  530         tf->tf_out[4] = (register_t)catcher;
  531         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  532                 /* Signal handler installed with SA_SIGINFO. */
  533                 tf->tf_out[1] = (register_t)&sfp->sf_si;
  534 
  535                 /* Fill in POSIX parts. */
  536                 sf.sf_si = ksi->ksi_info;
  537                 sf.sf_si.si_signo = sig; /* maybe a translated signal */
  538         } else {
  539                 /* Old FreeBSD-style arguments. */
  540                 tf->tf_out[1] = ksi->ksi_code;
  541                 tf->tf_out[3] = (register_t)ksi->ksi_addr;
  542         }
  543 
  544         /* Copy the sigframe out to the user's stack. */
  545         if (rwindow_save(td) != 0 || copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
  546             suword(&fp->fr_in[6], tf->tf_out[6]) != 0) {
  547                 /*
  548                  * Something is wrong with the stack pointer.
  549                  * ...Kill the process.
  550                  */
  551                 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp);
  552                 PROC_LOCK(p);
  553                 sigexit(td, SIGILL);
  554                 /* NOTREACHED */
  555         }
  556 
  557         tf->tf_tpc = (u_long)p->p_md.md_sigtramp;
  558         tf->tf_tnpc = tf->tf_tpc + 4;
  559         tf->tf_sp = (u_long)fp - SPOFF;
  560 
  561         CTR3(KTR_SIG, "sendsig: return td=%p pc=%#lx sp=%#lx", td, tf->tf_tpc,
  562             tf->tf_sp);
  563 
  564         PROC_LOCK(p);
  565         mtx_lock(&psp->ps_mtx);
  566 }
  567 
  568 #ifndef _SYS_SYSPROTO_H_
  569 struct sigreturn_args {
  570         ucontext_t *ucp;
  571 };
  572 #endif
  573 
  574 /*
  575  * MPSAFE
  576  */
  577 int
  578 sigreturn(struct thread *td, struct sigreturn_args *uap)
  579 {
  580         struct proc *p;
  581         mcontext_t *mc;
  582         ucontext_t uc;
  583         int error;
  584 
  585         p = td->td_proc;
  586         if (rwindow_save(td)) {
  587                 PROC_LOCK(p);
  588                 sigexit(td, SIGILL);
  589         }
  590 
  591         CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
  592         if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
  593                 CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
  594                 return (EFAULT);
  595         }
  596 
  597         mc = &uc.uc_mcontext;
  598         error = set_mcontext(td, mc);
  599         if (error != 0)
  600                 return (error);
  601 
  602         PROC_LOCK(p);
  603         td->td_sigmask = uc.uc_sigmask;
  604         SIG_CANTMASK(td->td_sigmask);
  605         signotify(td);
  606         PROC_UNLOCK(p);
  607 
  608         CTR4(KTR_SIG, "sigreturn: return td=%p pc=%#lx sp=%#lx tstate=%#lx",
  609             td, mc->mc_tpc, mc->mc_sp, mc->mc_tstate);
  610         return (EJUSTRETURN);
  611 }
  612 
  613 #ifdef COMPAT_FREEBSD4
  614 int
  615 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
  616 {
  617 
  618         return sigreturn(td, (struct sigreturn_args *)uap);
  619 }
  620 #endif
  621 
  622 /*
  623  * Construct a PCB from a trapframe. This is called from kdb_trap() where
  624  * we want to start a backtrace from the function that caused us to enter
  625  * the debugger. We have the context in the trapframe, but base the trace
  626  * on the PCB. The PCB doesn't have to be perfect, as long as it contains
  627  * enough for a backtrace.
  628  */
  629 void
  630 makectx(struct trapframe *tf, struct pcb *pcb)
  631 {
  632 
  633         pcb->pcb_pc = tf->tf_tpc;
  634         pcb->pcb_sp = tf->tf_sp;
  635 }
  636 
  637 int
  638 get_mcontext(struct thread *td, mcontext_t *mc, int flags)
  639 {
  640         struct trapframe *tf;
  641         struct pcb *pcb;
  642 
  643         tf = td->td_frame;
  644         pcb = td->td_pcb;
  645         bcopy(tf, mc, sizeof(*tf));
  646         if (flags & GET_MC_CLEAR_RET) {
  647                 mc->mc_out[0] = 0;
  648                 mc->mc_out[1] = 0;
  649         }
  650         mc->mc_flags = _MC_VERSION;
  651         critical_enter();
  652         if ((tf->tf_fprs & FPRS_FEF) != 0) {
  653                 savefpctx(pcb->pcb_ufp);
  654                 tf->tf_fprs &= ~FPRS_FEF;
  655                 pcb->pcb_flags |= PCB_FEF;
  656         }
  657         if ((pcb->pcb_flags & PCB_FEF) != 0) {
  658                 bcopy(pcb->pcb_ufp, mc->mc_fp, sizeof(mc->mc_fp));
  659                 mc->mc_fprs |= FPRS_FEF;
  660         }
  661         critical_exit();
  662         return (0);
  663 }
  664 
  665 int
  666 set_mcontext(struct thread *td, const mcontext_t *mc)
  667 {
  668         struct trapframe *tf;
  669         struct pcb *pcb;
  670         uint64_t wstate;
  671 
  672         if (!TSTATE_SECURE(mc->mc_tstate) ||
  673             (mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
  674                 return (EINVAL);
  675         tf = td->td_frame;
  676         pcb = td->td_pcb;
  677         /* Make sure the windows are spilled first. */
  678         flushw();
  679         wstate = tf->tf_wstate;
  680         bcopy(mc, tf, sizeof(*tf));
  681         tf->tf_wstate = wstate;
  682         if ((mc->mc_fprs & FPRS_FEF) != 0) {
  683                 tf->tf_fprs = 0;
  684                 bcopy(mc->mc_fp, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  685                 pcb->pcb_flags |= PCB_FEF;
  686         }
  687         return (0);
  688 }
  689 
  690 /*
  691  * Exit the kernel and execute a firmware call that will not return, as
  692  * specified by the arguments.
  693  */
  694 void
  695 cpu_shutdown(void *args)
  696 {
  697 
  698 #ifdef SMP
  699         cpu_mp_shutdown();
  700 #endif
  701         openfirmware_exit(args);
  702 }
  703 
  704 /* Get current clock frequency for the given CPU ID. */
  705 int
  706 cpu_est_clockrate(int cpu_id, uint64_t *rate)
  707 {
  708 
  709         return (ENXIO);
  710 }
  711 
  712 /*
  713  * Duplicate OF_exit() with a different firmware call function that restores
  714  * the trap table, otherwise a RED state exception is triggered in at least
  715  * some firmware versions.
  716  */
  717 void
  718 cpu_halt(void)
  719 {
  720         static struct {
  721                 cell_t name;
  722                 cell_t nargs;
  723                 cell_t nreturns;
  724         } args = {
  725                 (cell_t)"exit",
  726                 0,
  727                 0
  728         };
  729 
  730         cpu_shutdown(&args);
  731 }
  732 
  733 void
  734 sparc64_shutdown_final(void *dummy, int howto)
  735 {
  736         static struct {
  737                 cell_t name;
  738                 cell_t nargs;
  739                 cell_t nreturns;
  740         } args = {
  741                 (cell_t)"SUNW,power-off",
  742                 0,
  743                 0
  744         };
  745 
  746         /* Turn the power off? */
  747         if ((howto & RB_POWEROFF) != 0)
  748                 cpu_shutdown(&args);
  749         /* In case of halt, return to the firmware */
  750         if ((howto & RB_HALT) != 0)
  751                 cpu_halt();
  752 }
  753 
  754 void
  755 cpu_idle(void)
  756 {
  757 
  758         /* Insert code to halt (until next interrupt) for the idle loop. */
  759 }
  760 
  761 int
  762 ptrace_set_pc(struct thread *td, u_long addr)
  763 {
  764 
  765         td->td_frame->tf_tpc = addr;
  766         td->td_frame->tf_tnpc = addr + 4;
  767         return (0);
  768 }
  769 
  770 int
  771 ptrace_single_step(struct thread *td)
  772 {
  773 
  774         /* TODO; */
  775         return (0);
  776 }
  777 
  778 int
  779 ptrace_clear_single_step(struct thread *td)
  780 {
  781 
  782         /* TODO; */
  783         return (0);
  784 }
  785 
  786 void
  787 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
  788 {
  789         struct trapframe *tf;
  790         struct pcb *pcb;
  791         struct proc *p;
  792         u_long sp;
  793 
  794         /* XXX no cpu_exec */
  795         p = td->td_proc;
  796         p->p_md.md_sigtramp = NULL;
  797         if (p->p_md.md_utrap != NULL) {
  798                 utrap_free(p->p_md.md_utrap);
  799                 p->p_md.md_utrap = NULL;
  800         }
  801 
  802         pcb = td->td_pcb;
  803         tf = td->td_frame;
  804         sp = rounddown(stack, 16);
  805         bzero(pcb, sizeof(*pcb));
  806         bzero(tf, sizeof(*tf));
  807         tf->tf_out[0] = stack;
  808         tf->tf_out[3] = p->p_sysent->sv_psstrings;
  809         tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
  810         tf->tf_tnpc = entry + 4;
  811         tf->tf_tpc = entry;
  812         tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
  813 
  814         td->td_retval[0] = tf->tf_out[0];
  815         td->td_retval[1] = tf->tf_out[1];
  816 }
  817 
  818 int
  819 fill_regs(struct thread *td, struct reg *regs)
  820 {
  821 
  822         bcopy(td->td_frame, regs, sizeof(*regs));
  823         return (0);
  824 }
  825 
  826 int
  827 set_regs(struct thread *td, struct reg *regs)
  828 {
  829         struct trapframe *tf;
  830 
  831         if (!TSTATE_SECURE(regs->r_tstate))
  832                 return (EINVAL);
  833         tf = td->td_frame;
  834         regs->r_wstate = tf->tf_wstate;
  835         bcopy(regs, tf, sizeof(*regs));
  836         return (0);
  837 }
  838 
  839 int
  840 fill_dbregs(struct thread *td, struct dbreg *dbregs)
  841 {
  842 
  843         return (ENOSYS);
  844 }
  845 
  846 int
  847 set_dbregs(struct thread *td, struct dbreg *dbregs)
  848 {
  849 
  850         return (ENOSYS);
  851 }
  852 
  853 int
  854 fill_fpregs(struct thread *td, struct fpreg *fpregs)
  855 {
  856         struct trapframe *tf;
  857         struct pcb *pcb;
  858 
  859         pcb = td->td_pcb;
  860         tf = td->td_frame;
  861         bcopy(pcb->pcb_ufp, fpregs->fr_regs, sizeof(fpregs->fr_regs));
  862         fpregs->fr_fsr = tf->tf_fsr;
  863         fpregs->fr_gsr = tf->tf_gsr;
  864         return (0);
  865 }
  866 
  867 int
  868 set_fpregs(struct thread *td, struct fpreg *fpregs)
  869 {
  870         struct trapframe *tf;
  871         struct pcb *pcb;
  872 
  873         pcb = td->td_pcb;
  874         tf = td->td_frame;
  875         tf->tf_fprs &= ~FPRS_FEF;
  876         bcopy(fpregs->fr_regs, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  877         tf->tf_fsr = fpregs->fr_fsr;
  878         tf->tf_gsr = fpregs->fr_gsr;
  879         return (0);
  880 }
  881 
  882 struct md_utrap *
  883 utrap_alloc(void)
  884 {
  885         struct md_utrap *ut;
  886 
  887         ut = malloc(sizeof(struct md_utrap), M_SUBPROC, M_WAITOK | M_ZERO);
  888         ut->ut_refcnt = 1;
  889         return (ut);
  890 }
  891 
  892 void
  893 utrap_free(struct md_utrap *ut)
  894 {
  895         int refcnt;
  896 
  897         if (ut == NULL)
  898                 return;
  899         mtx_pool_lock(mtxpool_sleep, ut);
  900         ut->ut_refcnt--;
  901         refcnt = ut->ut_refcnt;
  902         mtx_pool_unlock(mtxpool_sleep, ut);
  903         if (refcnt == 0)
  904                 free(ut, M_SUBPROC);
  905 }
  906 
  907 struct md_utrap *
  908 utrap_hold(struct md_utrap *ut)
  909 {
  910 
  911         if (ut == NULL)
  912                 return (NULL);
  913         mtx_pool_lock(mtxpool_sleep, ut);
  914         ut->ut_refcnt++;
  915         mtx_pool_unlock(mtxpool_sleep, ut);
  916         return (ut);
  917 }

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