## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
-## along with this program; if not, write to the Free Software
-## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
for i in range(8, 496):
exc_names.append('IRQ%d' % i)
-def parse_varint(bytes):
+def parse_varint(bytes_):
'''Parse an integer where the top bit is the continuation bit.
Returns value and number of parsed bytes.'''
v = 0
- for i, b in enumerate(bytes):
+ for i, b in enumerate(bytes_):
v |= (b & 0x7F) << (i * 7)
if b & 0x80 == 0:
return v, i+1
- return v, len(bytes)
+ return v, len(bytes_)
-def parse_uint(bytes):
+def parse_uint(bytes_):
'''Parse little-endian integer.'''
v = 0
- for i, b in enumerate(bytes):
+ for i, b in enumerate(bytes_):
v |= b << (i * 8)
return v
-def parse_exc_info(bytes):
+def parse_exc_info(bytes_):
'''Parse exception information bytes from a branch packet.'''
- if len(bytes) < 1:
+ if len(bytes_) < 1:
return None
- excv, exclen = parse_varint(bytes)
- if bytes[exclen - 1] & 0x80 != 0x00:
+ excv, exclen = parse_varint(bytes_)
+ if bytes_[exclen - 1] & 0x80 != 0x00:
return None # Exception info not complete.
if exclen == 2 and excv & (1 << 13):
resume = (excv >> 14) & 0x0F
return (ns, exc, cancel, altisa, hyp, resume)
-def parse_branch_addr(bytes, ref_addr, cpu_state, branch_enc):
+def parse_branch_addr(bytes_, ref_addr, cpu_state, branch_enc):
'''Parse encoded branch address.
Returns addr, addrlen, cpu_state, exc_info.
Returns None if packet is not yet complete'''
- addr, addrlen = parse_varint(bytes)
+ addr, addrlen = parse_varint(bytes_)
- if bytes[addrlen-1] & 0x80 != 0x00:
+ if bytes_[addrlen - 1] & 0x80 != 0x00:
return None # Branch address not complete.
addr_bits = 7 * addrlen
have_exc_info = False
if branch_enc == 'original':
- if addrlen == 5 and bytes[4] & 0x40:
+ if addrlen == 5 and bytes_[4] & 0x40:
have_exc_info = True
elif branch_enc == 'alternative':
addr_bits -= 1 # Top bit of address indicates exc_info.
exc_info = None
if have_exc_info:
- exc_info = parse_exc_info(bytes[addrlen:])
+ exc_info = parse_exc_info(bytes_[addrlen:])
if exc_info is None:
return None # Exception info not complete.
if addrlen == 5:
# Possible change in CPU state.
- if bytes[4] & 0xB8 == 0x08:
+ if bytes_[4] & 0xB8 == 0x08:
cpu_state = 'arm'
- elif bytes[4] & 0xB0 == 0x10:
+ elif bytes_[4] & 0xB0 == 0x10:
cpu_state = 'thumb'
- elif bytes[4] & 0xA0 == 0x20:
+ elif bytes_[4] & 0xA0 == 0x20:
cpu_state = 'jazelle'
else:
- raise NotImplementedError('Unhandled branch byte 4: 0x%02x' % bytes[4])
+ raise NotImplementedError('Unhandled branch byte 4: 0x%02x' % bytes_[4])
# Shift the address according to current CPU state.
if cpu_state == 'arm':
return addr, addrlen, cpu_state, exc_info
class Decoder(srd.Decoder):
- api_version = 2
+ api_version = 3
id = 'arm_etmv3'
name = 'ARM ETMv3'
- longname = 'ARM Embedded Trace Macroblock'
- desc = 'Decode ETM instruction trace packets.'
+ longname = 'ARM Embedded Trace Macroblock v3'
+ desc = 'ARM ETM v3 instruction trace protocol.'
license = 'gplv2+'
inputs = ['uart']
- outputs = ['arm_etmv3']
+ outputs = []
+ tags = ['Debug/trace']
annotations = (
('trace', 'Trace info'),
('branch', 'Branches'),
)
def __init__(self):
+ self.reset()
+
+ def reset(self):
self.buf = []
self.syncbuf = []
self.prevsample = 0