FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/dtrace/riscv/dtrace_subr.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License, Version 1.0 only
      * (the "License").  You may not use this file except in compliance
      * with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     * or http://www.opensolaris.org/os/licensing.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     *
     * Portions Copyright 2016-2018 Ruslan Bukin <br@bsdpad.com>
     *
     * $FreeBSD$
     *
     */
    /*
     * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/kmem.h>
    #include <sys/proc.h>
    #include <sys/smp.h>
    #include <sys/dtrace_impl.h>
    #include <sys/dtrace_bsd.h>
    #include <cddl/dev/dtrace/dtrace_cddl.h>
    #include <machine/vmparam.h>
    #include <machine/encoding.h>
    #include <machine/riscvreg.h>
    #include <machine/clock.h>
    #include <machine/frame.h>
    #include <machine/trap.h>
    #include <vm/pmap.h>
    
    extern dtrace_id_t      dtrace_probeid_error;
    extern int (*dtrace_invop_jump_addr)(struct trapframe *);
    extern void dtrace_getnanotime(struct timespec *tsp);
    extern void dtrace_getnanouptime(struct timespec *tsp);
    
    int dtrace_invop(uintptr_t, struct trapframe *);
    void dtrace_invop_init(void);
    void dtrace_invop_uninit(void);
    
    typedef struct dtrace_invop_hdlr {
            int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t);
            struct dtrace_invop_hdlr *dtih_next;
    } dtrace_invop_hdlr_t;
    
    dtrace_invop_hdlr_t *dtrace_invop_hdlr;
    
    int
    dtrace_invop(uintptr_t addr, struct trapframe *frame)
    {
            struct thread *td;
            dtrace_invop_hdlr_t *hdlr;
            int rval;
    
            rval = 0;
            td = curthread;
            td->t_dtrace_trapframe = frame;
            for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
                    if ((rval = hdlr->dtih_func(addr, frame, 0)) != 0)
                            break;
            td->t_dtrace_trapframe = NULL;
            return (rval);
    }
    
    void
    dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
    {
            dtrace_invop_hdlr_t *hdlr;
    
            hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP);
            hdlr->dtih_func = func;
            hdlr->dtih_next = dtrace_invop_hdlr;
            dtrace_invop_hdlr = hdlr;
    }
    
    void
    dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
    {
            dtrace_invop_hdlr_t *hdlr, *prev;
    
            hdlr = dtrace_invop_hdlr;
           prev = NULL;
   
           for (;;) {
                   if (hdlr == NULL)
                           panic("attempt to remove non-existent invop handler");
   
                   if (hdlr->dtih_func == func)
                           break;
   
                   prev = hdlr;
                   hdlr = hdlr->dtih_next;
           }
   
           if (prev == NULL) {
                   ASSERT(dtrace_invop_hdlr == hdlr);
                   dtrace_invop_hdlr = hdlr->dtih_next;
           } else {
                   ASSERT(dtrace_invop_hdlr != hdlr);
                   prev->dtih_next = hdlr->dtih_next;
           }
   
           kmem_free(hdlr, 0);
   }
   
   /*ARGSUSED*/
   void
   dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
   {
   
           (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS);
   }
   
   void
   dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
   {
           cpuset_t cpus;
   
           if (cpu == DTRACE_CPUALL)
                   cpus = all_cpus;
           else
                   CPU_SETOF(cpu, &cpus);
   
           smp_rendezvous_cpus(cpus, smp_no_rendezvous_barrier, func,
               smp_no_rendezvous_barrier, arg);
   }
   
   static void
   dtrace_sync_func(void)
   {
   
   }
   
   void
   dtrace_sync(void)
   {
   
           dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
   }
   
   /*
    * DTrace needs a high resolution time function which can
    * be called from a probe context and guaranteed not to have
    * instrumented with probes itself.
    *
    * Returns nanoseconds since boot.
    */
   uint64_t
   dtrace_gethrtime(void)
   {
           struct timespec curtime;
   
           dtrace_getnanouptime(&curtime);
   
           return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
   
   }
   
   uint64_t
   dtrace_gethrestime(void)
   {
           struct timespec current_time;
   
           dtrace_getnanotime(&current_time);
   
           return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec);
   }
   
   /* Function to handle DTrace traps during probes. See riscv/riscv/trap.c */
   int
   dtrace_trap(struct trapframe *frame, u_int type)
   {
           /*
            * A trap can occur while DTrace executes a probe. Before
            * executing the probe, DTrace blocks re-scheduling and sets
            * a flag in its per-cpu flags to indicate that it doesn't
            * want to fault. On returning from the probe, the no-fault
            * flag is cleared and finally re-scheduling is enabled.
            *
            * Check if DTrace has enabled 'no-fault' mode:
            *
            */
   
           if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) {
                   /*
                    * There are only a couple of trap types that are expected.
                    * All the rest will be handled in the usual way.
                    */
                   switch (type) {
                   case SCAUSE_LOAD_ACCESS_FAULT:
                   case SCAUSE_STORE_ACCESS_FAULT:
                   case SCAUSE_INST_ACCESS_FAULT:
                           /* Flag a bad address. */
                           cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
                           cpu_core[curcpu].cpuc_dtrace_illval = 0;
   
                           /*
                            * Offset the instruction pointer to the instruction
                            * following the one causing the fault.
                            */
                           frame->tf_sepc += 4;
   
                           return (1);
                   default:
                           /* Handle all other traps in the usual way. */
                           break;
                   }
           }
   
           /* Handle the trap in the usual way. */
           return (0);
   }
   
   void
   dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
       int fault, int fltoffs, uintptr_t illval)
   {
   
           dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
               (uintptr_t)epid,
               (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
   }
   
   static int
   match_opcode(uint32_t insn, int match, int mask)  
   {
   
           if (((insn ^ match) & mask) == 0)
                   return (1);
   
           return (0);
   }
   
   static int
   dtrace_invop_start(struct trapframe *frame)
   {
           register_t *sp;
           uint32_t uimm;
           uint32_t imm;
           int invop;
   
           invop = dtrace_invop(frame->tf_sepc, frame);
           if (invop == 0)
                   return (-1);
   
           if (match_opcode(invop, (MATCH_SD | RS2_RA | RS1_SP),
               (MASK_SD | RS2_MASK | RS1_MASK))) {
                   /* Non-compressed store of ra to sp */
                   imm = (invop >> 7) & 0x1f;
                   imm |= ((invop >> 25) & 0x7f) << 5;
                   sp = (register_t *)((uint8_t *)frame->tf_sp + imm);
                   *sp = frame->tf_ra;
                   frame->tf_sepc += INSN_SIZE;
                   return (0);
           }
   
           if (match_opcode(invop, (MATCH_JALR | (X_RA << RS1_SHIFT)),
               (MASK_JALR | RD_MASK | RS1_MASK | IMM_MASK))) {
                   /* Non-compressed ret */
                   frame->tf_sepc = frame->tf_ra;
                   return (0);
           }
   
           if (match_opcode(invop, (MATCH_C_SDSP | RS2_C_RA),
               (MASK_C_SDSP | RS2_C_MASK))) {
                   /* 'C'-compressed store of ra to sp */
                   uimm = ((invop >> 10) & 0x7) << 3;
                   uimm |= ((invop >> 7) & 0x7) << 6;
                   sp = (register_t *)((uint8_t *)frame->tf_sp + uimm);
                   *sp = frame->tf_ra;
                   frame->tf_sepc += INSN_C_SIZE;
                   return (0);
           }
   
           if (match_opcode(invop, (MATCH_C_JR | (X_RA << RD_SHIFT)),
               (MASK_C_JR | RD_MASK))) {
                   /* 'C'-compressed ret */
                   frame->tf_sepc = frame->tf_ra;
                   return (0);
           }
   
   #ifdef INVARIANTS
           panic("Instruction %x doesn't match any opcode.", invop);
   #endif
   
           return (-1);
   }
   
   void
   dtrace_invop_init(void)
   {
   
           dtrace_invop_jump_addr = dtrace_invop_start;
   }
   
   void
   dtrace_invop_uninit(void)
   {
   
           dtrace_invop_jump_addr = 0;
   }

Cache object: 78bc9320fe7b80e8b97992b10333f083