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Groups > linux.kernel > #1522317
| From | Wang Nan <wangnan0@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 25/34] perf clang jit: Export functions for jitted code |
| Date | 2016-11-15 05:20 +0100 |
| Message-ID | <sDDnY-8py-37@gated-at.bofh.it> (permalink) |
| References | <sDDeh-8kE-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
After this patch functions attached on perf hooks is allowed to invoke
external functions. Add a testcase for this feature.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
tools/perf/tests/Build | 2 +-
tools/perf/tests/bpf-script-example.c | 4 ++++
tools/perf/util/c++/clang-c.h | 2 ++
tools/perf/util/c++/clang-test.cpp | 9 +++++++++
tools/perf/util/c++/clang.cpp | 17 ++++++++++++++++-
5 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6676c2d..d6e6e00 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -49,7 +49,7 @@ $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
$(call rule_mkdir)
$(Q)echo '#include <tests/llvm.h>' > $@
$(Q)echo 'const char test_llvm__bpf_base_prog[] =' >> $@
- $(Q)sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
+ $(Q)sed -e 's/\\/\\\\/g' -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
$(Q)echo ';' >> $@
$(OUTPUT)tests/llvm-src-kbuild.c: tests/bpf-script-test-kbuild.c tests/Build
diff --git a/tools/perf/tests/bpf-script-example.c b/tools/perf/tests/bpf-script-example.c
index 265036e..ccbc19c 100644
--- a/tools/perf/tests/bpf-script-example.c
+++ b/tools/perf/tests/bpf-script-example.c
@@ -48,9 +48,13 @@ char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
#ifdef TEST_PERF_HOOK
+extern int printf(const char *fmt, ...);
+extern void test__clang_callback(int x);
SEC("perfhook:test")
void hook_test(void)
{
+ printf("Hello, hook_test\n");
+ test__clang_callback(1234);
return;
}
#endif
diff --git a/tools/perf/util/c++/clang-c.h b/tools/perf/util/c++/clang-c.h
index 5ebcb41..9f75e41 100644
--- a/tools/perf/util/c++/clang-c.h
+++ b/tools/perf/util/c++/clang-c.h
@@ -16,6 +16,8 @@ extern int test__clang_to_IR(void);
extern int test__clang_to_obj(void);
extern int test__clang_jit(void);
+extern void test__clang_callback(int x);
+
extern int perf_clang__compile_bpf(const char *filename,
void **p_obj_buf,
size_t *p_obj_buf_sz);
diff --git a/tools/perf/util/c++/clang-test.cpp b/tools/perf/util/c++/clang-test.cpp
index 2b4aa8d..0bdb807 100644
--- a/tools/perf/util/c++/clang-test.cpp
+++ b/tools/perf/util/c++/clang-test.cpp
@@ -68,6 +68,13 @@ int test__clang_to_obj(void)
return 0;
}
+static int callback_flag;
+
+void test__clang_callback(int x)
+{
+ callback_flag = x;
+}
+
int test__clang_jit(void)
{
perf_clang_scope _scope;
@@ -84,6 +91,8 @@ int test__clang_jit(void)
perf_hooks__set_hook(i.first.c_str(), i.second, NULL);
perf_hooks__invoke_test();
+ if (callback_flag != 1234)
+ return -1;
return 0;
}
diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
index 03012b2..325fbe4 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -30,6 +30,8 @@
#include "llvm/Target/TargetOptions.h"
#include <memory>
#include <vector>
+#include <set>
+#include <tuple>
#include "clang.h"
#include "clang-c.h"
@@ -194,6 +196,15 @@ PerfModule::toBPFObject(void)
return std::move(Buffer);
}
+static std::map<const std::string, const void *> exported_funcs =
+{
+#define EXPORT(f) {#f, (const void *)&f}
+ EXPORT(test__clang_callback),
+ EXPORT(printf),
+ EXPORT(puts),
+#undef EXPORT
+};
+
/*
* Use a global memory manager so allocated code and data won't be released
* when object destroy.
@@ -220,7 +231,11 @@ int PerfModule::doJIT(void)
auto Resolver = createLambdaResolver(
[](const std::string &Name) {
- return RuntimeDyld::SymbolInfo(nullptr);
+ auto i = exported_funcs.find(Name);
+ if (i == exported_funcs.end())
+ return RuntimeDyld::SymbolInfo(nullptr);
+ return RuntimeDyld::SymbolInfo((uint64_t)(i->second),
+ JITSymbolFlags::Exported);
},
[](const std::string &Name) {
return RuntimeDyld::SymbolInfo(nullptr);
--
2.10.1
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[PATCH 00/34] perf clang: Builtin clang and perfhook support Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 21/34] perf clang: Pass CFLAGS to builtin clang Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 33/34] perf clang builtin: Define hook helpers by default Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 28/34] perf clang jit: Access BPF map Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 16/34] perf clang: Allow passing CFLAGS to builtin clang Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 23/34] perf clang jit: Insignt BPF and JIT functions in a Module Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 02/34] perf record: Fix segfault when running with suid and kptr_restrict is 1 Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 06/34] tools lib bpf: Add private field for bpf_object Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:10 +0100
[PATCH 03/34] tools perf: Add missing struct defeinition in probe_event.h Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 01/34] perf tools: Fix kernel version error in ubuntu Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 24/34] perf clang jit: add PerfModule::doJIT to JIT perfhook functions Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 30/34] perf clang: Link BPF functions declaration into perf Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 11/34] tools build: Add feature detection for LLVM Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 32/34] perf clang: Include helpers to BPF scripts Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 05/34] tools lib bpf: Add missing bpf map functions Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
Re: [PATCH 05/34] tools lib bpf: Add missing bpf map functions "Wangnan (F)" <wangnan0@huawei.com> - 2016-11-17 04:30 +0100
[PATCH 31/34] perf clang: Declare BPF functions for BPF scripts automatically Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 29/34] perf clang jit: Allow jitted perf hook access BPF maps Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 34/34] perf clang git: Export getpid() to perf hook Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 09/34] perf tools: Pass context to perf hook functions Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 22/34] perf clang jit: Wrap llvm::Module using PerfModule Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 25/34] perf clang jit: Export functions for jitted code Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 20/34] perf clang: Pass full path to builtin clang Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 18/34] perf clang: Support compile IR to BPF object and add testcase Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 15/34] perf clang: Use real file system for #include Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 27/34] perf clang jit: Collect the lowest address in maps section as map_base Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 17/34] perf clang: Update test case to use real BPF script Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 13/34] perf build: Add clang and llvm compile and linking support Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 12/34] tools build: Add feature detection for clang Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 08/34] perf tools: Introduce perf hooks Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 07/34] tools lib bpf: Retrive bpf_map through offset of bpf_map_def Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 26/34] perf clang jit: Actually JIT and hook in bpf loader Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 14/34] perf clang: Add builtin clang support ant test case Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 10/34] perf llvm: Extract helpers in llvm-utils.c Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
[PATCH 19/34] perf clang: Compile BPF script use builtin clang support Wang Nan <wangnan0@huawei.com> - 2016-11-15 05:20 +0100
Re: [PATCH 00/34] perf clang: Builtin clang and perfhook support "Wangnan (F)" <wangnan0@huawei.com> - 2016-11-15 05:40 +0100
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