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| Current File : //usr/src/cddl/contrib/opensolaris/lib/libdtrace/sparc/dt_isadep.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
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <libgen.h>
#include <dt_impl.h>
#include <dt_pid.h>
#define OP(x) ((x) >> 30)
#define OP2(x) (((x) >> 22) & 0x07)
#define COND(x) (((x) >> 25) & 0x0f)
#define A(x) (((x) >> 29) & 0x01)
#define OP_BRANCH 0
#define OP2_BPcc 0x1
#define OP2_Bicc 0x2
#define OP2_BPr 0x3
#define OP2_FBPfcc 0x5
#define OP2_FBfcc 0x6
/*ARGSUSED*/
int
dt_pid_create_entry_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
fasttrap_probe_spec_t *ftp, const GElf_Sym *symp)
{
ftp->ftps_type = DTFTP_ENTRY;
ftp->ftps_pc = (uintptr_t)symp->st_value;
ftp->ftps_size = (size_t)symp->st_size;
ftp->ftps_noffs = 1;
ftp->ftps_offs[0] = 0;
if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
strerror(errno));
return (dt_set_errno(dtp, errno));
}
return (1);
}
int
dt_pid_create_return_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, uint64_t *stret)
{
uint32_t *text;
int i;
int srdepth = 0;
if ((text = malloc(symp->st_size + 4)) == NULL) {
dt_dprintf("mr sparkle: malloc() failed\n");
return (DT_PROC_ERR);
}
if (Pread(P, text, symp->st_size, symp->st_value) != symp->st_size) {
dt_dprintf("mr sparkle: Pread() failed\n");
free(text);
return (DT_PROC_ERR);
}
/*
* Leave a dummy instruction in the last slot to simplify edge
* conditions.
*/
text[symp->st_size / 4] = 0;
ftp->ftps_type = DTFTP_RETURN;
ftp->ftps_pc = symp->st_value;
ftp->ftps_size = symp->st_size;
ftp->ftps_noffs = 0;
for (i = 0; i < symp->st_size / 4; i++) {
/*
* If we encounter an existing tracepoint, query the
* kernel to find out the instruction that was
* replaced at this spot.
*/
while (text[i] == FASTTRAP_INSTR) {
fasttrap_instr_query_t instr;
instr.ftiq_pid = Pstatus(P)->pr_pid;
instr.ftiq_pc = symp->st_value + i * 4;
if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_GETINSTR,
&instr) != 0) {
if (errno == ESRCH || errno == ENOENT) {
if (Pread(P, &text[i], 4,
instr.ftiq_pc) != 4) {
dt_dprintf("mr sparkle: "
"Pread() failed\n");
free(text);
return (DT_PROC_ERR);
}
continue;
}
free(text);
dt_dprintf("mr sparkle: getinstr query "
"failed: %s\n", strerror(errno));
return (DT_PROC_ERR);
}
text[i] = instr.ftiq_instr;
break;
}
/* save */
if ((text[i] & 0xc1f80000) == 0x81e00000) {
srdepth++;
continue;
}
/* restore */
if ((text[i] & 0xc1f80000) == 0x81e80000) {
srdepth--;
continue;
}
if (srdepth > 0) {
/* ret */
if (text[i] == 0x81c7e008)
goto is_ret;
/* return */
if (text[i] == 0x81cfe008)
goto is_ret;
/* call or jmpl w/ restore in the slot */
if (((text[i] & 0xc0000000) == 0x40000000 ||
(text[i] & 0xc1f80000) == 0x81c00000) &&
(text[i + 1] & 0xc1f80000) == 0x81e80000)
goto is_ret;
/* call to one of the stret routines */
if ((text[i] & 0xc0000000) == 0x40000000) {
int32_t disp = text[i] << 2;
uint64_t dest = ftp->ftps_pc + i * 4 + disp;
dt_dprintf("dest = %llx\n", (u_longlong_t)dest);
if (dest == stret[0] || dest == stret[1] ||
dest == stret[2] || dest == stret[3])
goto is_ret;
}
} else {
/* external call */
if ((text[i] & 0xc0000000) == 0x40000000) {
int32_t dst = text[i] << 2;
dst += i * 4;
if ((uintptr_t)dst >= (uintptr_t)symp->st_size)
goto is_ret;
}
/* jmpl into %g0 -- this includes the retl pseudo op */
if ((text[i] & 0xfff80000) == 0x81c00000)
goto is_ret;
/* external branch -- possible return site */
if (OP(text[i]) == OP_BRANCH) {
int32_t dst;
int baa;
switch (OP2(text[i])) {
case OP2_BPcc:
dst = text[i] & 0x7ffff;
dst <<= 13;
dst >>= 11;
baa = COND(text[i]) == 8 && A(text[i]);
break;
case OP2_Bicc:
dst = text[i] & 0x3fffff;
dst <<= 10;
dst >>= 8;
baa = COND(text[i]) == 8 && A(text[i]);
break;
case OP2_BPr:
dst = (((text[i]) >> 6) & 0xc000) |
((text[i]) & 0x3fff);
dst <<= 16;
dst >>= 14;
baa = 0;
break;
case OP2_FBPfcc:
dst = text[i] & 0x7ffff;
dst <<= 13;
dst >>= 11;
baa = COND(text[i]) == 8 && A(text[i]);
break;
case OP2_FBfcc:
dst = text[i] & 0x3fffff;
dst <<= 10;
dst >>= 8;
baa = COND(text[i]) == 8 && A(text[i]);
break;
default:
continue;
}
dst += i * 4;
/*
* Interpret branches outside of the function's
* bounds as potential return sites. If the
* branch is a ba,a don't skip the instruction
* in the delay slot.
*/
if ((uintptr_t)dst >=
(uintptr_t)symp->st_size) {
if (baa)
goto is_ret_baa;
else
goto is_ret;
}
}
}
continue;
is_ret:
i++;
is_ret_baa:
dt_dprintf("return at offset %x\n", i * 4);
ftp->ftps_offs[ftp->ftps_noffs++] = i * 4;
}
free(text);
if (ftp->ftps_noffs > 0) {
if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
strerror(errno));
return (dt_set_errno(dtp, errno));
}
}
return (ftp->ftps_noffs);
}
/*ARGSUSED*/
int
dt_pid_create_offset_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, ulong_t off)
{
if (off & 0x3)
return (DT_PROC_ALIGN);
ftp->ftps_type = DTFTP_OFFSETS;
ftp->ftps_pc = (uintptr_t)symp->st_value;
ftp->ftps_size = (size_t)symp->st_size;
ftp->ftps_noffs = 1;
ftp->ftps_offs[0] = off;
if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
strerror(errno));
return (dt_set_errno(dtp, errno));
}
return (1);
}
/*ARGSUSED*/
int
dt_pid_create_glob_offset_probes(struct ps_prochandle *P, dtrace_hdl_t *dtp,
fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, const char *pattern)
{
ulong_t i;
ftp->ftps_type = DTFTP_OFFSETS;
ftp->ftps_pc = (uintptr_t)symp->st_value;
ftp->ftps_size = (size_t)symp->st_size;
ftp->ftps_noffs = 0;
/*
* If we're matching against everything, just iterate through each
* instruction in the function, otherwise look for matching offset
* names by constructing the string and comparing it against the
* pattern.
*/
if (strcmp("*", pattern) == 0) {
for (i = 0; i < symp->st_size; i += 4) {
ftp->ftps_offs[ftp->ftps_noffs++] = i;
}
} else {
char name[sizeof (i) * 2 + 1];
for (i = 0; i < symp->st_size; i += 4) {
(void) sprintf(name, "%lx", i);
if (gmatch(name, pattern))
ftp->ftps_offs[ftp->ftps_noffs++] = i;
}
}
if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
strerror(errno));
return (dt_set_errno(dtp, errno));
}
return (ftp->ftps_noffs);
}