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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2006-2008 John Birrell jb@freebsd.org
* Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org
* Portions Copyright 2013 Howard Su howardsu@freebsd.org
* Portions Copyright 2016-2018 Ruslan Bukin <br@bsdpad.com>
*
* $FreeBSD$
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/dtrace.h>
#include <machine/riscvreg.h>
#include <machine/encoding.h>
#include "fbt.h"
#define FBT_C_PATCHVAL MATCH_C_EBREAK
#define FBT_PATCHVAL MATCH_EBREAK
#define FBT_ENTRY "entry"
#define FBT_RETURN "return"
int
fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval)
{
solaris_cpu_t *cpu;
fbt_probe_t *fbt;
cpu = &solaris_cpu[curcpu];
fbt = fbt_probetab[FBT_ADDR2NDX(addr)];
for (; fbt != NULL; fbt = fbt->fbtp_hashnext) {
if ((uintptr_t)fbt->fbtp_patchpoint == addr) {
cpu->cpu_dtrace_caller = addr;
dtrace_probe(fbt->fbtp_id, frame->tf_a[0],
frame->tf_a[1], frame->tf_a[2],
frame->tf_a[3], frame->tf_a[4]);
cpu->cpu_dtrace_caller = 0;
return (fbt->fbtp_savedval);
}
}
return (0);
}
void
fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val)
{
switch(fbt->fbtp_patchval) {
case FBT_C_PATCHVAL:
*(uint16_t *)fbt->fbtp_patchpoint = (uint16_t)val;
fence_i();
break;
case FBT_PATCHVAL:
*fbt->fbtp_patchpoint = val;
fence_i();
break;
};
}
static int
match_opcode(uint32_t insn, int match, int mask)
{
if (((insn ^ match) & mask) == 0)
return (1);
return (0);
}
static int
check_c_ret(uint32_t **instr)
{
uint16_t *instr1;
int i;
for (i = 0; i < 2; i++) {
instr1 = (uint16_t *)(*instr) + i;
if (match_opcode(*instr1, (MATCH_C_JR | (X_RA << RD_SHIFT)),
(MASK_C_JR | RD_MASK))) {
*instr = (uint32_t *)instr1;
return (1);
}
}
return (0);
}
static int
check_c_sdsp(uint32_t **instr)
{
uint16_t *instr1;
int i;
for (i = 0; i < 2; i++) {
instr1 = (uint16_t *)(*instr) + i;
if (match_opcode(*instr1, (MATCH_C_SDSP | RS2_C_RA),
(MASK_C_SDSP | RS2_C_MASK))) {
*instr = (uint32_t *)instr1;
return (1);
}
}
return (0);
}
int
fbt_provide_module_function(linker_file_t lf, int symindx,
linker_symval_t *symval, void *opaque)
{
fbt_probe_t *fbt, *retfbt;
uint32_t *instr, *limit;
const char *name;
char *modname;
int patchval;
int rval;
modname = opaque;
name = symval->name;
/* Check if function is excluded from instrumentation */
if (fbt_excluded(name))
return (0);
instr = (uint32_t *)(symval->value);
limit = (uint32_t *)(symval->value + symval->size);
/* Look for sd operation */
for (; instr < limit; instr++) {
/* Look for a non-compressed store of ra to sp */
if (match_opcode(*instr, (MATCH_SD | RS2_RA | RS1_SP),
(MASK_SD | RS2_MASK | RS1_MASK))) {
rval = DTRACE_INVOP_SD;
patchval = FBT_PATCHVAL;
break;
}
/* Look for a 'C'-compressed store of ra to sp. */
if (check_c_sdsp(&instr)) {
rval = DTRACE_INVOP_C_SDSP;
patchval = FBT_C_PATCHVAL;
break;
}
}
if (instr >= limit)
return (0);
fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
fbt->fbtp_name = name;
fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
name, FBT_ENTRY, 3, fbt);
fbt->fbtp_patchpoint = instr;
fbt->fbtp_ctl = lf;
fbt->fbtp_loadcnt = lf->loadcnt;
fbt->fbtp_savedval = *instr;
fbt->fbtp_patchval = patchval;
fbt->fbtp_rval = rval;
fbt->fbtp_symindx = symindx;
fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
lf->fbt_nentries++;
retfbt = NULL;
again:
for (; instr < limit; instr++) {
/* Look for non-compressed return */
if (match_opcode(*instr, (MATCH_JALR | (X_RA << RS1_SHIFT)),
(MASK_JALR | RD_MASK | RS1_MASK | IMM_MASK))) {
rval = DTRACE_INVOP_RET;
patchval = FBT_PATCHVAL;
break;
}
/* Look for 'C'-compressed return */
if (check_c_ret(&instr)) {
rval = DTRACE_INVOP_C_RET;
patchval = FBT_C_PATCHVAL;
break;
}
}
if (instr >= limit)
return (0);
/*
* We have a winner!
*/
fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
fbt->fbtp_name = name;
if (retfbt == NULL) {
fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
name, FBT_RETURN, 3, fbt);
} else {
retfbt->fbtp_probenext = fbt;
fbt->fbtp_id = retfbt->fbtp_id;
}
retfbt = fbt;
fbt->fbtp_patchpoint = instr;
fbt->fbtp_ctl = lf;
fbt->fbtp_loadcnt = lf->loadcnt;
fbt->fbtp_symindx = symindx;
fbt->fbtp_rval = rval;
fbt->fbtp_savedval = *instr;
fbt->fbtp_patchval = patchval;
fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
lf->fbt_nentries++;
instr++;
goto again;
}
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