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processor-trace/libipt/src/pt_sync.c at master · dkirat/processor-trace · GitHub
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pt_sync.c
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processor-trace
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libipt
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src
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pt_sync.c
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/*
* Copyright (c) 2013-2015, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include
"pt_sync.h"
#include
"pt_packet.h"
#include
"intel-pt.h"
/* A psb packet contains a unique 2-byte repeating pattern.
*
* There are only two ways to fill up a 64bit work with such a pattern.
*/
const
uint64_t
psb_pattern
[]
=
{
((
uint64_t
)
pt_psb_lohi
| (
uint64_t
)
pt_psb_lohi
<<
16
|
(
uint64_t
)
pt_psb_lohi
<<
32
| (
uint64_t
)
pt_psb_lohi
<<
48
),
((
uint64_t
)
pt_psb_hilo
| (
uint64_t
)
pt_psb_hilo
<<
16
|
(
uint64_t
)
pt_psb_hilo
<<
32
| (
uint64_t
)
pt_psb_hilo
<<
48
)
};
static
const
uint8_t
*
truncate
(
const
uint8_t
*
pointer
,
size_t
alignment
)
{
uintptr_t
raw
=
(
uintptr_t
)
pointer
;
raw
/=
alignment
;
raw
*=
alignment
;
return
(
const
uint8_t
*
)
raw
;
}
static
const
uint8_t
*
align
(
const
uint8_t
*
pointer
,
size_t
alignment
)
{
return
truncate
(
pointer
+
alignment
-
1
,
alignment
);
}
/* Find a psb packet given a position somewhere in the payload.
*
* Return the position of the psb packet.
* Return NULL, if this is not a psb packet.
*/
static
const
uint8_t
*
pt_find_psb
(
const
uint8_t
*
pos
,
const
struct
pt_config
*
config
)
{
const
uint8_t
*
begin
,
*
end
;
int
errcode
;
if
(!
pos
||
!
config
)
return
NULL
;
begin
=
config
->
begin
;
end
=
config
->
end
;
/* Navigate to the end of the psb payload pattern.
*
* Beware that PSB is an extended opcode. We must not confuse the extend
* opcode of the following packet as belonging to the PSB.
*/
if
(
*
pos
!=
pt_psb_hi
)
pos
++
;
for
(; (
pos
+
1
)
<
end
;
pos
+=
2
) {
uint8_t
hi
,
lo
;
hi
=
pos
[
0
];
lo
=
pos
[
1
];
if
(
hi
!=
pt_psb_hi
)
break
;
if
(
lo
!=
pt_psb_lo
)
break
;
}
/*
* We're right after the psb payload and within the buffer.
* Navigate to the expected beginning of the psb packet.
*/
pos
-=
ptps_psb
;
/* Check if we're still inside the buffer. */
if
(
pos
<
begin
)
return
NULL
;
/* Check that this is indeed a psb packet we're at. */
if
(
pos
[
0
]
!=
pt_opc_psb
||
pos
[
1
]
!=
pt_ext_psb
)
return
NULL
;
errcode
=
pt_pkt_read_psb
(
pos
,
config
);
if
(
errcode
<
0
)
return
NULL
;
return
pos
;
}
static
int
pt_sync_within_bounds
(
const
uint8_t
*
pos
,
const
uint8_t
*
begin
,
const
uint8_t
*
end
)
{
/* We allow @pos == @end representing the very end of the trace.
*
* This will result in -pte_eos when we actually try to read from @pos.
*/
return
(
begin
<=
pos
)
&&
(
pos
<=
end
);
}
int
pt_sync_set
(
const
uint8_t
*
*
sync
,
const
uint8_t
*
pos
,
const
struct
pt_config
*
config
)
{
const
uint8_t
*
begin
,
*
end
;
int
errcode
;
if
(!
sync
||
!
pos
||
!
config
)
return
-
pte_internal
;
begin
=
config
->
begin
;
end
=
config
->
end
;
if
(!
pt_sync_within_bounds
(
pos
,
begin
,
end
))
return
-
pte_eos
;
if
(
end
<
pos
+
2
)
return
-
pte_eos
;
/* Check that this is indeed a psb packet we're at. */
if
(
pos
[
0
]
!=
pt_opc_psb
||
pos
[
1
]
!=
pt_ext_psb
)
return
-
pte_nosync
;
errcode
=
pt_pkt_read_psb
(
pos
,
config
);
if
(
errcode
<
0
)
return
errcode
;
*
sync
=
pos
;
return
0
;
}
int
pt_sync_forward
(
const
uint8_t
*
*
sync
,
const
uint8_t
*
pos
,
const
struct
pt_config
*
config
)
{
const
uint8_t
*
begin
,
*
end
;
if
(!
sync
||
!
pos
||
!
config
)
return
-
pte_internal
;
begin
=
config
->
begin
;
end
=
config
->
end
;
if
(!
pt_sync_within_bounds
(
pos
,
begin
,
end
))
return
-
pte_internal
;
/* We search for a full 64bit word. It's OK to skip the current one. */
pos
=
align
(
pos
,
sizeof
(
*
psb_pattern
));
/* Search for the psb payload pattern in the buffer. */
for
(;;) {
const
uint8_t
*
current
=
pos
;
uint64_t
val
;
pos
+=
sizeof
(
uint64_t
);
if
(
end
<
pos
)
return
-
pte_eos
;
val
=
*
(
const
uint64_t
*
)
current
;
if
((
val
!=
psb_pattern
[
0
])
&&
(
val
!=
psb_pattern
[
1
]))
continue
;
/* We found a 64bit word's worth of psb payload pattern. */
current
=
pt_find_psb
(
pos
,
config
);
if
(!
current
)
continue
;
*
sync
=
current
;
return
0
;
}
}
int
pt_sync_backward
(
const
uint8_t
*
*
sync
,
const
uint8_t
*
pos
,
const
struct
pt_config
*
config
)
{
const
uint8_t
*
begin
,
*
end
;
if
(!
sync
||
!
pos
||
!
config
)
return
-
pte_internal
;
begin
=
config
->
begin
;
end
=
config
->
end
;
if
(!
pt_sync_within_bounds
(
pos
,
begin
,
end
))
return
-
pte_internal
;
/* We search for a full 64bit word. It's OK to skip the current one. */
pos
=
truncate
(
pos
,
sizeof
(
*
psb_pattern
));
/* Search for the psb payload pattern in the buffer. */
for
(;;) {
const
uint8_t
*
next
=
pos
;
uint64_t
val
;
pos
-=
sizeof
(
uint64_t
);
if
(
pos
<
begin
)
return
-
pte_eos
;
val
=
*
(
const
uint64_t
*
)
pos
;
if
((
val
!=
psb_pattern
[
0
])
&&
(
val
!=
psb_pattern
[
1
]))
continue
;
/* We found a 64bit word's worth of psb payload pattern. */
next
=
pt_find_psb
(
next
,
config
);
if
(!
next
)
continue
;
*
sync
=
next
;
return
0
;
}
}
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