166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* Portions Copyright 2006-2008 John Birrell jb@freebsd.org
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* Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org
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* Portions Copyright 2013 Howard Su howardsu@freebsd.org
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* Portions Copyright 2016 Ruslan Bukin <br@bsdpad.com>
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*
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* $FreeBSD$
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/dtrace.h>
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#include <machine/riscvreg.h>
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#include "fbt.h"
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#define FBT_PATCHVAL (RISCV_INSN_BREAK)
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#define FBT_ENTRY "entry"
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#define FBT_RETURN "return"
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int
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fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval)
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{
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solaris_cpu_t *cpu;
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fbt_probe_t *fbt;
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cpu = &solaris_cpu[curcpu];
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fbt = fbt_probetab[FBT_ADDR2NDX(addr)];
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for (; fbt != NULL; fbt = fbt->fbtp_hashnext) {
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if ((uintptr_t)fbt->fbtp_patchpoint == addr) {
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cpu->cpu_dtrace_caller = addr;
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dtrace_probe(fbt->fbtp_id, frame->tf_a[0],
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frame->tf_a[1], frame->tf_a[2],
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frame->tf_a[3], frame->tf_a[4]);
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cpu->cpu_dtrace_caller = 0;
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return (fbt->fbtp_savedval);
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}
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}
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return (0);
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}
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void
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fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val)
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{
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*fbt->fbtp_patchpoint = val;
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cpu_icache_sync_range((vm_offset_t)fbt->fbtp_patchpoint, 4);
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}
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int
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fbt_provide_module_function(linker_file_t lf, int symindx,
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linker_symval_t *symval, void *opaque)
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{
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fbt_probe_t *fbt, *retfbt;
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uint32_t *target, *start;
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uint32_t *instr, *limit;
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const char *name;
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char *modname;
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int offs;
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modname = opaque;
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name = symval->name;
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/* Check if function is excluded from instrumentation */
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if (fbt_excluded(name))
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return (0);
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instr = (uint32_t *)(symval->value);
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limit = (uint32_t *)(symval->value + symval->size);
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/* Look for sd operation */
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for (; instr < limit; instr++) {
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if ((*instr & SD_RA_SP_MASK) == SD_RA_SP)
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break;
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}
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if (instr >= limit)
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return (0);
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fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
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fbt->fbtp_name = name;
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fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
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name, FBT_ENTRY, 3, fbt);
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fbt->fbtp_patchpoint = instr;
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fbt->fbtp_ctl = lf;
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fbt->fbtp_loadcnt = lf->loadcnt;
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fbt->fbtp_savedval = *instr;
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fbt->fbtp_patchval = FBT_PATCHVAL;
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fbt->fbtp_rval = DTRACE_INVOP_SD;
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fbt->fbtp_symindx = symindx;
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fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
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fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
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lf->fbt_nentries++;
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retfbt = NULL;
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again:
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for (; instr < limit; instr++) {
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if (*instr == RISCV_INSN_RET)
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break;
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}
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if (instr >= limit)
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return (0);
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/*
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* We have a winner!
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*/
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fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
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fbt->fbtp_name = name;
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if (retfbt == NULL) {
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fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
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name, FBT_RETURN, 3, fbt);
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} else {
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retfbt->fbtp_next = fbt;
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fbt->fbtp_id = retfbt->fbtp_id;
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}
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retfbt = fbt;
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fbt->fbtp_patchpoint = instr;
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fbt->fbtp_ctl = lf;
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fbt->fbtp_loadcnt = lf->loadcnt;
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fbt->fbtp_symindx = symindx;
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fbt->fbtp_rval = DTRACE_INVOP_RET;
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fbt->fbtp_savedval = *instr;
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fbt->fbtp_patchval = FBT_PATCHVAL;
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fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
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fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
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lf->fbt_nentries++;
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instr++;
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goto again;
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}
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