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[PATCH 32/39] perf tools: Add BPF_PROLOGUE config options for further patches

From Wang Nan <wangnan0@huawei.com>
Newsgroups linux.kernel
Subject [PATCH 32/39] perf tools: Add BPF_PROLOGUE config options for further patches
Date 2015-07-09 14:50 +0200
Message-ID <pKjr5-dD-33@gated-at.bofh.it> (permalink)
References <pKjhn-9T-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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If both LIBBPF and DWARF is detected, it is possible to create prologue
for eBPF programs to help them accessing kernel data. HAVE_BPF_PROLOGUE
and CONFIG_BPF_PROLOGUE is added as flags for this feature.

PERF_HAVE_ARCH_GET_REG_OFFSET indicates an architecture supports
converting name of a register to its offset in 'struct pt_regs'.
Without this support, BPF_PROLOGUE should be turned off.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
---
 tools/perf/config/Makefile           | 12 ++++++++++++
 tools/perf/util/include/dwarf-regs.h |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 52722cf..d776f32 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -310,6 +310,18 @@ ifndef NO_LIBELF
       CFLAGS += -DHAVE_LIBBPF_SUPPORT
       $(call detected,CONFIG_LIBBPF)
     endif
+
+    ifndef NO_DWARF
+      ifneq ($(origin PERF_HAVE_ARCH_GET_REG_INFO), undefined)
+        CFLAGS += -DHAVE_BPF_PROLOGUE
+        $(call detected,CONFIG_BPF_PROLOGUE)
+      else
+        msg := $(warning BPF prologue is not supported by architecture $(ARCH));
+      endif
+    else
+      msg := $(warning DWARF support is off, BPF prologue is disabled);
+    endif
+
   endif # NO_LIBBPF
 endif # NO_LIBELF
 
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 8f14965..3dda083 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -5,4 +5,11 @@
 const char *get_arch_regstr(unsigned int n);
 #endif
 
+#ifdef HAVE_BPF_PROLOGUE
+/*
+ * Arch should support fetching the offset of a register in pt_regs
+ * by its name.
+ */
+int arch_get_reg_info(const char *name, int *offset);
+#endif
 #endif
-- 
1.8.3.4

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Thread

[GIT PULL 00/39] perf tools: filtering events using eBPF programs Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:40 +0200
  [PATCH 36/39] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 25/39] perf tools: Attach eBPF program to perf event Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 27/39] perf record: Add clang options for compiling BPF scripts Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 34/39] perf tools: Add prologue for BPF programs for fetching arguments Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 31/39] perf tools: Move linux/filter.h to tools/include Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 26/39] perf tools: Suppress probing messages when probing by BPF loading Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 28/39] bpf tools: Load a program with different instances using preprocessor Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
    Re: [PATCH 28/39] bpf tools: Load a program with different instances  using preprocessor "Wangnan (F)" <wangnan0@huawei.com> - 2015-07-13 08:00 +0200
  [PATCH 13/39] perf tools: Call clang to compile C source to object code Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 32/39] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 06/39] bpf tools: Create eBPF maps defined in an object file Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
    Re: [PATCH 06/39] bpf tools: Create eBPF maps defined in an object  file "Wangnan (F)" <wangnan0@huawei.com> - 2015-07-14 06:10 +0200
  [PATCH 35/39] perf tools: Generate prologue for BPF programs Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 30/39] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 18/39] perf record: Enable passing bpf object file to --event Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 14/39] perf tools: Auto detecting kernel build directory Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 23/39] perf record: Load all eBPF object into kernel Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 24/39] perf tools: Add bpf_fd field to evsel and config it Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 22/39] perf record: Probe at kprobe points Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 15/39] perf tools: Auto detecting kernel include options Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 29/39] perf tools: Fix probe-event.h include Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 02/39] bpf tools: Collect eBPF programs from their own sections Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
    Re: [PATCH 02/39] bpf tools: Collect eBPF programs from their own  sections "Wangnan (F)" <wangnan0@huawei.com> - 2015-07-10 05:20 +0200
      Re: [PATCH 02/39] bpf tools: Collect eBPF programs from their own  sections "Wangnan (F)" <wangnan0@huawei.com> - 2015-07-14 06:10 +0200
  [PATCH 21/39] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 09/39] bpf tools: Load eBPF programs in object files into kernel Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  [PATCH 37/39] perf record: Support custom vmlinux path Wang Nan <wangnan0@huawei.com> - 2015-07-09 14:50 +0200
  perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering  events using eBPF programs Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-07-14 17:40 +0200
    Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering  events using eBPF programs "Wangnan (F)" <wangnan0@huawei.com> - 2015-07-15 13:10 +0200
      Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering  events using eBPF programs Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-07-15 13:30 +0200

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