QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.8 KiB
103 lines
2.8 KiB
# SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
"""
|
|
DTrace/SystemTAP backend.
|
|
"""
|
|
|
|
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
|
|
__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
|
|
__license__ = "GPL version 2 or (at your option) any later version"
|
|
|
|
__maintainer__ = "Stefan Hajnoczi"
|
|
__email__ = "stefanha@redhat.com"
|
|
|
|
|
|
from tracetool import out
|
|
|
|
|
|
PUBLIC = True
|
|
|
|
|
|
PROBEPREFIX = None
|
|
|
|
def probeprefix():
|
|
if PROBEPREFIX is None:
|
|
raise ValueError("you must set PROBEPREFIX")
|
|
return PROBEPREFIX
|
|
|
|
|
|
BINARY = None
|
|
|
|
def binary():
|
|
if BINARY is None:
|
|
raise ValueError("you must set BINARY")
|
|
return BINARY
|
|
|
|
|
|
def generate_h_begin(events, group):
|
|
if group == "root":
|
|
header = "trace-dtrace-root.h"
|
|
else:
|
|
header = "trace-dtrace-%s.h" % group
|
|
|
|
# Workaround for ust backend, which also includes <sys/sdt.h> and may
|
|
# require SDT_USE_VARIADIC to be defined. If dtrace includes <sys/sdt.h>
|
|
# first without defining SDT_USE_VARIADIC then ust breaks because the
|
|
# STAP_PROBEV() macro is not defined.
|
|
out('#ifndef SDT_USE_VARIADIC')
|
|
out('#define SDT_USE_VARIADIC 1')
|
|
out('#endif')
|
|
|
|
out('#include "%s"' % header,
|
|
'')
|
|
|
|
out('#undef SDT_USE_VARIADIC')
|
|
|
|
# SystemTap defines <provider>_<name>_ENABLED() but other DTrace
|
|
# implementations might not.
|
|
for e in events:
|
|
out('#ifndef QEMU_%(uppername)s_ENABLED',
|
|
'#define QEMU_%(uppername)s_ENABLED() true',
|
|
'#endif',
|
|
uppername=e.name.upper())
|
|
|
|
def generate_h(event, group):
|
|
out(' QEMU_%(uppername)s(%(argnames)s);',
|
|
uppername=event.name.upper(),
|
|
argnames=", ".join(event.args.names()))
|
|
|
|
|
|
def generate_h_backend_dstate(event, group):
|
|
out(' QEMU_%(uppername)s_ENABLED() || \\',
|
|
uppername=event.name.upper())
|
|
|
|
|
|
def generate_rs_begin(events, group):
|
|
out('use std::cell::UnsafeCell;',
|
|
'',
|
|
'extern "C" {')
|
|
# These are the Rust declarations of the .probes section semaphores
|
|
# generated by dtrace(1) in its .o file output.
|
|
for e in events:
|
|
if 'disable' in e.properties:
|
|
continue
|
|
out(' #[allow(dead_code)]',
|
|
f' static qemu_{e.name}_semaphore: UnsafeCell<u16>;')
|
|
out('}',
|
|
'')
|
|
|
|
|
|
def generate_rs(event, group):
|
|
args = event.args.rust_call_extern()
|
|
if args:
|
|
args = ', ' + args
|
|
|
|
out(f' ::trace::probe!(qemu, {event.name}{args});')
|
|
|
|
|
|
def generate_rs_backend_dstate(event, group):
|
|
# Rust does not have access to the <provider>_<name>_ENABLED() macro from
|
|
# the dtrace(1) generated .h file. Use the matching semaphore declarations
|
|
# generated by generate_rs_begin() instead.
|
|
out(' (unsafe {qemu_%(n)s_semaphore.get().read_volatile()}) != 0 ||',
|
|
n=event.name)
|
|
|