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         phandle_t child;
  275         phandle_t root;
  276         struct pcpu *pc;
  277         vm_offset_t end;
  278         caddr_t kmdp;
  279         u_int clock;
  280         char *env;
  281         char type[8];
  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("Boot flags requested debugger");
  452 #endif
  453 }
  454 
  455 void
  456 set_openfirm_callback(ofw_vec_t *vec)
  457 {
  458         ofw_tba = rdpr(tba);
  459         ofw_vec = (u_long)vec;
  460 }
  461 
  462 void
  463 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  464 {
  465         struct trapframe *tf;
  466         struct sigframe *sfp;
  467         struct sigacts *psp;
  468         struct sigframe sf;
  469         struct thread *td;
  470         struct frame *fp;
  471         struct proc *p;
  472         int oonstack;
  473         u_long sp;
  474         int sig;
  475 
  476         oonstack = 0;
  477         td = curthread;
  478         p = td->td_proc;
  479         PROC_LOCK_ASSERT(p, MA_OWNED);
  480         sig = ksi->ksi_signo;
  481         psp = p->p_sigacts;
  482         mtx_assert(&psp->ps_mtx, MA_OWNED);
  483         tf = td->td_frame;
  484         sp = tf->tf_sp + SPOFF;
  485         oonstack = sigonstack(sp);
  486 
  487         CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
  488             catcher, sig);
  489 
  490         /* Make sure we have a signal trampoline to return to. */
  491         if (p->p_md.md_sigtramp == NULL) {
  492                 /*
  493                  * No signal trampoline... kill the process.
  494                  */
  495                 CTR0(KTR_SIG, "sendsig: no sigtramp");
  496                 printf("sendsig: %s is too old, rebuild it\n", p->p_comm);
  497                 sigexit(td, sig);
  498                 /* NOTREACHED */
  499         }
  500 
  501         /* Save user context. */
  502         bzero(&sf, sizeof(sf));
  503         get_mcontext(td, &sf.sf_uc.uc_mcontext, 0);
  504         sf.sf_uc.uc_sigmask = *mask;
  505         sf.sf_uc.uc_stack = td->td_sigstk;
  506         sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  507             ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
  508 
  509         /* Allocate and validate space for the signal handler context. */
  510         if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
  511             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  512                 sfp = (struct sigframe *)(td->td_sigstk.ss_sp +
  513                     td->td_sigstk.ss_size - sizeof(struct sigframe));
  514         } else
  515                 sfp = (struct sigframe *)sp - 1;
  516         mtx_unlock(&psp->ps_mtx);
  517         PROC_UNLOCK(p);
  518 
  519         fp = (struct frame *)sfp - 1;
  520 
  521         /* Translate the signal if appropriate. */
  522         if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
  523                 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
  524 
  525         /* Build the argument list for the signal handler. */
  526         tf->tf_out[0] = sig;
  527         tf->tf_out[2] = (register_t)&sfp->sf_uc;
  528         tf->tf_out[4] = (register_t)catcher;
  529         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  530                 /* Signal handler installed with SA_SIGINFO. */
  531                 tf->tf_out[1] = (register_t)&sfp->sf_si;
  532 
  533                 /* Fill in POSIX parts. */
  534                 sf.sf_si = ksi->ksi_info;
  535                 sf.sf_si.si_signo = sig; /* maybe a translated signal */
  536         } else {
  537                 /* Old FreeBSD-style arguments. */
  538                 tf->tf_out[1] = ksi->ksi_code;
  539                 tf->tf_out[3] = (register_t)ksi->ksi_addr;
  540         }
  541 
  542         /* Copy the sigframe out to the user's stack. */
  543         if (rwindow_save(td) != 0 || copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
  544             suword(&fp->fr_in[6], tf->tf_out[6]) != 0) {
  545                 /*
  546                  * Something is wrong with the stack pointer.
  547                  * ...Kill the process.
  548                  */
  549                 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp);
  550                 PROC_LOCK(p);
  551                 sigexit(td, SIGILL);
  552                 /* NOTREACHED */
  553         }
  554 
  555         tf->tf_tpc = (u_long)p->p_md.md_sigtramp;
  556         tf->tf_tnpc = tf->tf_tpc + 4;
  557         tf->tf_sp = (u_long)fp - SPOFF;
  558 
  559         CTR3(KTR_SIG, "sendsig: return td=%p pc=%#lx sp=%#lx", td, tf->tf_tpc,
  560             tf->tf_sp);
  561 
  562         PROC_LOCK(p);
  563         mtx_lock(&psp->ps_mtx);
  564 }
  565 
  566 #ifndef _SYS_SYSPROTO_H_
  567 struct sigreturn_args {
  568         ucontext_t *ucp;
  569 };
  570 #endif
  571 
  572 /*
  573  * MPSAFE
  574  */
  575 int
  576 sigreturn(struct thread *td, struct sigreturn_args *uap)
  577 {
  578         struct proc *p;
  579         mcontext_t *mc;
  580         ucontext_t uc;
  581         int error;
  582 
  583         p = td->td_proc;
  584         if (rwindow_save(td)) {
  585                 PROC_LOCK(p);
  586                 sigexit(td, SIGILL);
  587         }
  588 
  589         CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
  590         if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
  591                 CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
  592                 return (EFAULT);
  593         }
  594 
  595         mc = &uc.uc_mcontext;
  596         error = set_mcontext(td, mc);
  597         if (error != 0)
  598                 return (error);
  599 
  600         PROC_LOCK(p);
  601         td->td_sigmask = uc.uc_sigmask;
  602         SIG_CANTMASK(td->td_sigmask);
  603         signotify(td);
  604         PROC_UNLOCK(p);
  605 
  606         CTR4(KTR_SIG, "sigreturn: return td=%p pc=%#lx sp=%#lx tstate=%#lx",
  607             td, mc->mc_tpc, mc->mc_sp, mc->mc_tstate);
  608         return (EJUSTRETURN);
  609 }
  610 
  611 #ifdef COMPAT_FREEBSD4
  612 int
  613 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
  614 {
  615 
  616         return sigreturn(td, (struct sigreturn_args *)uap);
  617 }
  618 #endif
  619 
  620 /*
  621  * Construct a PCB from a trapframe. This is called from kdb_trap() where
  622  * we want to start a backtrace from the function that caused us to enter
  623  * the debugger. We have the context in the trapframe, but base the trace
  624  * on the PCB. The PCB doesn't have to be perfect, as long as it contains
  625  * enough for a backtrace.
  626  */
  627 void
  628 makectx(struct trapframe *tf, struct pcb *pcb)
  629 {
  630 
  631         pcb->pcb_pc = tf->tf_tpc;
  632         pcb->pcb_sp = tf->tf_sp;
  633 }
  634 
  635 int
  636 get_mcontext(struct thread *td, mcontext_t *mc, int flags)
  637 {
  638         struct trapframe *tf;
  639         struct pcb *pcb;
  640 
  641         tf = td->td_frame;
  642         pcb = td->td_pcb;
  643         bcopy(tf, mc, sizeof(*tf));
  644         if (flags & GET_MC_CLEAR_RET) {
  645                 mc->mc_out[0] = 0;
  646                 mc->mc_out[1] = 0;
  647         }
  648         mc->mc_flags = _MC_VERSION;
  649         critical_enter();
  650         if ((tf->tf_fprs & FPRS_FEF) != 0) {
  651                 savefpctx(pcb->pcb_ufp);
  652                 tf->tf_fprs &= ~FPRS_FEF;
  653                 pcb->pcb_flags |= PCB_FEF;
  654         }
  655         if ((pcb->pcb_flags & PCB_FEF) != 0) {
  656                 bcopy(pcb->pcb_ufp, mc->mc_fp, sizeof(mc->mc_fp));
  657                 mc->mc_fprs |= FPRS_FEF;
  658         }
  659         critical_exit();
  660         return (0);
  661 }
  662 
  663 int
  664 set_mcontext(struct thread *td, const mcontext_t *mc)
  665 {
  666         struct trapframe *tf;
  667         struct pcb *pcb;
  668         uint64_t wstate;
  669 
  670         if (!TSTATE_SECURE(mc->mc_tstate) ||
  671             (mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
  672                 return (EINVAL);
  673         tf = td->td_frame;
  674         pcb = td->td_pcb;
  675         /* Make sure the windows are spilled first. */
  676         flushw();
  677         wstate = tf->tf_wstate;
  678         bcopy(mc, tf, sizeof(*tf));
  679         tf->tf_wstate = wstate;
  680         if ((mc->mc_fprs & FPRS_FEF) != 0) {
  681                 tf->tf_fprs = 0;
  682                 bcopy(mc->mc_fp, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  683                 pcb->pcb_flags |= PCB_FEF;
  684         }
  685         return (0);
  686 }
  687 
  688 /*
  689  * Exit the kernel and execute a firmware call that will not return, as
  690  * specified by the arguments.
  691  */
  692 void
  693 cpu_shutdown(void *args)
  694 {
  695 
  696 #ifdef SMP
  697         cpu_mp_shutdown();
  698 #endif
  699         openfirmware_exit(args);
  700 }
  701 
  702 /* Get current clock frequency for the given cpu id. */
  703 int
  704 cpu_est_clockrate(int cpu_id, uint64_t *rate)
  705 {
  706 
  707         return (ENXIO);
  708 }
  709 
  710 /*
  711  * Duplicate OF_exit() with a different firmware call function that restores
  712  * the trap table, otherwise a RED state exception is triggered in at least
  713  * some firmware versions.
  714  */
  715 void
  716 cpu_halt(void)
  717 {
  718         static struct {
  719                 cell_t name;
  720                 cell_t nargs;
  721                 cell_t nreturns;
  722         } args = {
  723                 (cell_t)"exit",
  724                 0,
  725                 0
  726         };
  727 
  728         cpu_shutdown(&args);
  729 }
  730 
  731 void
  732 sparc64_shutdown_final(void *dummy, int howto)
  733 {
  734         static struct {
  735                 cell_t name;
  736                 cell_t nargs;
  737                 cell_t nreturns;
  738         } args = {
  739                 (cell_t)"SUNW,power-off",
  740                 0,
  741                 0
  742         };
  743 
  744         /* Turn the power off? */
  745         if ((howto & RB_POWEROFF) != 0)
  746                 cpu_shutdown(&args);
  747         /* In case of halt, return to the firmware */
  748         if ((howto & RB_HALT) != 0)
  749                 cpu_halt();
  750 }
  751 
  752 void
  753 cpu_idle(void)
  754 {
  755         /* Insert code to halt (until next interrupt) for the idle loop */
  756 }
  757 
  758 int
  759 ptrace_set_pc(struct thread *td, u_long addr)
  760 {
  761 
  762         td->td_frame->tf_tpc = addr;
  763         td->td_frame->tf_tnpc = addr + 4;
  764         return (0);
  765 }
  766 
  767 int
  768 ptrace_single_step(struct thread *td)
  769 {
  770         /* TODO; */
  771         return (0);
  772 }
  773 
  774 int
  775 ptrace_clear_single_step(struct thread *td)
  776 {
  777         /* TODO; */
  778         return (0);
  779 }
  780 
  781 void
  782 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
  783 {
  784         struct trapframe *tf;
  785         struct pcb *pcb;
  786         struct proc *p;
  787         u_long sp;
  788 
  789         /* XXX no cpu_exec */
  790         p = td->td_proc;
  791         p->p_md.md_sigtramp = NULL;
  792         if (p->p_md.md_utrap != NULL) {
  793                 utrap_free(p->p_md.md_utrap);
  794                 p->p_md.md_utrap = NULL;
  795         }
  796 
  797         pcb = td->td_pcb;
  798         tf = td->td_frame;
  799         sp = rounddown(stack, 16);
  800         bzero(pcb, sizeof(*pcb));
  801         bzero(tf, sizeof(*tf));
  802         tf->tf_out[0] = stack;
  803         tf->tf_out[3] = p->p_sysent->sv_psstrings;
  804         tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
  805         tf->tf_tnpc = entry + 4;
  806         tf->tf_tpc = entry;
  807         tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
  808 
  809         td->td_retval[0] = tf->tf_out[0];
  810         td->td_retval[1] = tf->tf_out[1];
  811 }
  812 
  813 int
  814 fill_regs(struct thread *td, struct reg *regs)
  815 {
  816 
  817         bcopy(td->td_frame, regs, sizeof(*regs));
  818         return (0);
  819 }
  820 
  821 int
  822 set_regs(struct thread *td, struct reg *regs)
  823 {
  824         struct trapframe *tf;
  825 
  826         if (!TSTATE_SECURE(regs->r_tstate))
  827                 return (EINVAL);
  828         tf = td->td_frame;
  829         regs->r_wstate = tf->tf_wstate;
  830         bcopy(regs, tf, sizeof(*regs));
  831         return (0);
  832 }
  833 
  834 int
  835 fill_dbregs(struct thread *td, struct dbreg *dbregs)
  836 {
  837 
  838         return (ENOSYS);
  839 }
  840 
  841 int
  842 set_dbregs(struct thread *td, struct dbreg *dbregs)
  843 {
  844 
  845         return (ENOSYS);
  846 }
  847 
  848 int
  849 fill_fpregs(struct thread *td, struct fpreg *fpregs)
  850 {
  851         struct trapframe *tf;
  852         struct pcb *pcb;
  853 
  854         pcb = td->td_pcb;
  855         tf = td->td_frame;
  856         bcopy(pcb->pcb_ufp, fpregs->fr_regs, sizeof(fpregs->fr_regs));
  857         fpregs->fr_fsr = tf->tf_fsr;
  858         fpregs->fr_gsr = tf->tf_gsr;
  859         return (0);
  860 }
  861 
  862 int
  863 set_fpregs(struct thread *td, struct fpreg *fpregs)
  864 {
  865         struct trapframe *tf;
  866         struct pcb *pcb;
  867 
  868         pcb = td->td_pcb;
  869         tf = td->td_frame;
  870         tf->tf_fprs &= ~FPRS_FEF;
  871         bcopy(fpregs->fr_regs, pcb->pcb_ufp, sizeof(pcb->pcb_ufp));
  872         tf->tf_fsr = fpregs->fr_fsr;
  873         tf->tf_gsr = fpregs->fr_gsr;
  874         return (0);
  875 }
  876 
  877 struct md_utrap *
  878 utrap_alloc(void)
  879 {
  880         struct md_utrap *ut;
  881 
  882         ut = malloc(sizeof(struct md_utrap), M_SUBPROC, M_WAITOK | M_ZERO);
  883         ut->ut_refcnt = 1;
  884         return (ut);
  885 }
  886 
  887 void
  888 utrap_free(struct md_utrap *ut)
  889 {
  890         int refcnt;
  891 
  892         if (ut == NULL)
  893                 return;
  894         mtx_pool_lock(mtxpool_sleep, ut);
  895         ut->ut_refcnt--;
  896         refcnt = ut->ut_refcnt;
  897         mtx_pool_unlock(mtxpool_sleep, ut);
  898         if (refcnt == 0)
  899                 free(ut, M_SUBPROC);
  900 }
  901 
  902 struct md_utrap *
  903 utrap_hold(struct md_utrap *ut)
  904 {
  905 
  906         if (ut == NULL)
  907                 return (NULL);
  908         mtx_pool_lock(mtxpool_sleep, ut);
  909         ut->ut_refcnt++;
  910         mtx_pool_unlock(mtxpool_sleep, ut);
  911         return (ut);
  912 }
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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/machdep.c
