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dwarves/CMakeLists.txt
Arnaldo Carvalho de Melo 472256d3c5 btf_loader: Introduce a loader for the BTF format 
Show 'struct list_head' from DWARF info:

  $ pahole -C list_head ~/git/build/v4.20-rc5+/net/ipv4/tcp.o
  struct list_head {
	  struct list_head *         next;                 /*     0     8 */
	  struct list_head *         prev;                 /*     8     8 */

	  /* size: 16, cachelines: 1, members: 2 */
	  /* last cacheline: 16 bytes */
  };

Try to show it from BTF, on a file without it:

  $ pahole -F btf -C list_head ~/git/build/v4.20-rc5+/net/ipv4/tcp.o
  pahole: /home/acme/git/build/v4.20-rc5+/net/ipv4/tcp.o: No debugging information found

Encode BTF from the DWARF info:

  $ pahole -J ~/git/build/v4.20-rc5+/net/ipv4/tcp.o

Check that it is there:
  $ readelf -SW ~/git/build/v4.20-rc5+/net/ipv4/tcp.o  | grep BTF
  readelf: /home/acme/git/build/v4.20-rc5+/net/ipv4/tcp.o: Warning: possibly corrupt ELF header - it has a non-zero program header offset, but no program headers
    [136] .BTF              PROGBITS        0000000000000000 101d0e 042edf 00      0   0  1

Now try again printing 'struct list_head' from the BTF info just
encoded:

  $ pahole -F btf -C list_head ~/git/build/v4.20-rc5+/net/ipv4/tcp.o  2> /dev/null
  struct list_head {
	  struct list_head *         next;                 /*     0     8 */
	  struct list_head *         prev;                 /*     8     8 */

	  /* size: 16, cachelines: 1, members: 2 */
	  /* last cacheline: 16 bytes */
  };
  $

There is the bitfields case that BTF desn't have the bit_size info for
bitfield members that makes the output from dwarf to be different than
the one from BTF:

  $ pahole -F btf -C sk_buff ~/git/build/v4.20-rc5+/net/ipv4/tcp.o > /tmp/sk_buff.btf
  $ pahole -F dwarf -C sk_buff ~/git/build/v4.20-rc5+/net/ipv4/tcp.o > /tmp/sk_buff.dwarf
  $ diff -u /tmp/sk_buff.dwarf /tmp/sk_buff.btf
  --- /tmp/sk_buff.dwarf	2018-12-20 14:50:51.428653046 -0300
  +++ /tmp/sk_buff.btf	2018-12-20 14:50:46.302601516 -0300
  @@ -38,45 +38,45 @@
   	__u16                      hdr_len;              /*   138     2 */
   	__u16                      queue_mapping;        /*   140     2 */
   	__u8                       __cloned_offset[0];   /*   142     0 */
  -	__u8                       cloned:1;             /*   142: 7  1 */
  -	__u8                       nohdr:1;              /*   142: 6  1 */
  -	__u8                       fclone:2;             /*   142: 4  1 */
  -	__u8                       peeked:1;             /*   142: 3  1 */
  -	__u8                       head_frag:1;          /*   142: 2  1 */
  -	__u8                       xmit_more:1;          /*   142: 1  1 */
  -	__u8                       pfmemalloc:1;         /*   142: 0  1 */
  +	__u8                       cloned;               /*   142     1 */
  +	__u8                       nohdr;                /*   142     1 */
  +	__u8                       fclone;               /*   142     1 */
  +	__u8                       peeked;               /*   142     1 */
  +	__u8                       head_frag;            /*   142     1 */
  +	__u8                       xmit_more;            /*   142     1 */
  +	__u8                       pfmemalloc;           /*   142     1 */

   	/* XXX 1 byte hole, try to pack */

   	__u32                      headers_start[0];     /*   144     0 */
   	__u8                       __pkt_type_offset[0]; /*   144     0 */
  -	__u8                       pkt_type:3;           /*   144: 5  1 */
  -	__u8                       ignore_df:1;          /*   144: 4  1 */
  -	__u8                       nf_trace:1;           /*   144: 3  1 */
  -	__u8                       ip_summed:2;          /*   144: 1  1 */
  -	__u8                       ooo_okay:1;           /*   144: 0  1 */
  -	__u8                       l4_hash:1;            /*   145: 7  1 */
  -	__u8                       sw_hash:1;            /*   145: 6  1 */
  -	__u8                       wifi_acked_valid:1;   /*   145: 5  1 */
  -	__u8                       wifi_acked:1;         /*   145: 4  1 */
  -	__u8                       no_fcs:1;             /*   145: 3  1 */
  -	__u8                       encapsulation:1;      /*   145: 2  1 */
  -	__u8                       encap_hdr_csum:1;     /*   145: 1  1 */
  -	__u8                       csum_valid:1;         /*   145: 0  1 */
  -	__u8                       csum_complete_sw:1;   /*   146: 7  1 */
  -	__u8                       csum_level:2;         /*   146: 5  1 */
  -	__u8                       csum_not_inet:1;      /*   146: 4  1 */
  -	__u8                       dst_pending_confirm:1; /*   146: 3  1 */
  -	__u8                       ndisc_nodetype:2;     /*   146: 1  1 */
  -	__u8                       ipvs_property:1;      /*   146: 0  1 */
  -	__u8                       inner_protocol_type:1; /*   147: 7  1 */
  -	__u8                       remcsum_offload:1;    /*   147: 6  1 */
  -	__u8                       offload_fwd_mark:1;   /*   147: 5  1 */
  -	__u8                       offload_mr_fwd_mark:1; /*   147: 4  1 */
  -	__u8                       tc_skip_classify:1;   /*   147: 3  1 */
  -	__u8                       tc_at_ingress:1;      /*   147: 2  1 */
  -	__u8                       tc_redirected:1;      /*   147: 1  1 */
  -	__u8                       tc_from_ingress:1;    /*   147: 0  1 */
  +	__u8                       pkt_type;             /*   144     1 */
  +	__u8                       ignore_df;            /*   144     1 */
  +	__u8                       nf_trace;             /*   144     1 */
  +	__u8                       ip_summed;            /*   144     1 */
  +	__u8                       ooo_okay;             /*   144     1 */
  +	__u8                       l4_hash;              /*   145     1 */
  +	__u8                       sw_hash;              /*   145     1 */
  +	__u8                       wifi_acked_valid;     /*   145     1 */
  +	__u8                       wifi_acked;           /*   145     1 */
  +	__u8                       no_fcs;               /*   145     1 */
  +	__u8                       encapsulation;        /*   145     1 */
  +	__u8                       encap_hdr_csum;       /*   145     1 */
  +	__u8                       csum_valid;           /*   145     1 */
  +	__u8                       csum_complete_sw;     /*   146     1 */
  +	__u8                       csum_level;           /*   146     1 */
  +	__u8                       csum_not_inet;        /*   146     1 */
  +	__u8                       dst_pending_confirm;  /*   146     1 */
  +	__u8                       ndisc_nodetype;       /*   146     1 */
  +	__u8                       ipvs_property;        /*   146     1 */
  +	__u8                       inner_protocol_type;  /*   147     1 */
  +	__u8                       remcsum_offload;      /*   147     1 */
  +	__u8                       offload_fwd_mark;     /*   147     1 */
  +	__u8                       offload_mr_fwd_mark;  /*   147     1 */
  +	__u8                       tc_skip_classify;     /*   147     1 */
  +	__u8                       tc_at_ingress;        /*   147     1 */
  +	__u8                       tc_redirected;        /*   147     1 */
  +	__u8                       tc_from_ingress;      /*   147     1 */
   	__u16                      tc_index;             /*   148     2 */

   	/* XXX 2 bytes hole, try to pack */
  $

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-12-20 15:23:35 -03:00

107 lines
4.1 KiB
CMake
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project(pahole C)
cmake_minimum_required(VERSION 2.4.8)
cmake_policy(SET CMP0005 NEW)
INCLUDE_DIRECTORIES( ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR} )
# Try to parse this later, Helio just showed me a KDE4 example to support
# x86-64 builds.
# the following are directories where stuff will be installed to
set(__LIB "" CACHE STRING "Define suffix of directory name (32/64)" )
macro(_set_fancy _var _value _comment)
if (NOT DEFINED ${_var})
set(${_var} ${_value})
else (NOT DEFINED ${_var})
set(${_var} "${${_var}}" CACHE PATH "${_comment}")
endif (NOT DEFINED ${_var})
endmacro(_set_fancy)
# where to look first for cmake modules,
# before ${CMAKE_ROOT}/Modules/ is checked
set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
if (NOT CMAKE_BUILD_TYPE)
set (CMAKE_BUILD_TYPE Debug CACHE STRING
"Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel."
FORCE)
endif (NOT CMAKE_BUILD_TYPE)
add_definitions(-D_GNU_SOURCE -DDWARVES_VERSION="v1.12")
find_package(DWARF REQUIRED)
find_package(ZLIB REQUIRED)
_set_fancy(LIB_INSTALL_DIR "${EXEC_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${__LIB}" "libdir")
set(dwarves_LIB_SRCS dwarves.c dwarves_fprintf.c gobuffer strings
ctf_encoder.c ctf_loader.c libctf.c btf_encoder.c btf_loader.c libbtf.c
dwarf_loader.c dutil.c elf_symtab.c rbtree.c)
add_library(dwarves SHARED ${dwarves_LIB_SRCS})
set_target_properties(dwarves PROPERTIES VERSION 1.0.0 SOVERSION 1)
set_target_properties(dwarves PROPERTIES INTERFACE_LINK_LIBRARIES "")
target_link_libraries(dwarves ${DWARF_LIBRARIES} ${ZLIB_LIBRARIES})
set(dwarves_emit_LIB_SRCS dwarves_emit.c)
add_library(dwarves_emit SHARED ${dwarves_emit_LIB_SRCS})
set_target_properties(dwarves_emit PROPERTIES VERSION 1.0.0 SOVERSION 1)
target_link_libraries(dwarves_emit dwarves)
set(dwarves_reorganize_LIB_SRCS dwarves_reorganize.c)
add_library(dwarves_reorganize SHARED ${dwarves_reorganize_LIB_SRCS})
set_target_properties(dwarves_reorganize PROPERTIES VERSION 1.0.0 SOVERSION 1)
target_link_libraries(dwarves_reorganize dwarves)
set(codiff_SRCS codiff.c)
add_executable(codiff ${codiff_SRCS})
target_link_libraries(codiff dwarves)
set(ctracer_SRCS ctracer.c)
add_executable(ctracer ${ctracer_SRCS})
target_link_libraries(ctracer dwarves dwarves_emit dwarves_reorganize ${ELF_LIBRARY})
set(dtagnames_SRCS dtagnames.c)
add_executable(dtagnames ${dtagnames_SRCS})
target_link_libraries(dtagnames dwarves)
set(pahole_SRCS pahole.c)
add_executable(pahole ${pahole_SRCS})
target_link_libraries(pahole dwarves dwarves_reorganize)
set(pdwtags_SRCS pdwtags.c)
add_executable(pdwtags ${pdwtags_SRCS})
target_link_libraries(pdwtags dwarves)
set(pglobal_SRCS pglobal.c)
add_executable(pglobal ${pglobal_SRCS})
target_link_libraries(pglobal dwarves)
set(pfunct_SRCS pfunct.c )
add_executable(pfunct ${pfunct_SRCS})
target_link_libraries(pfunct dwarves dwarves_emit ${ELF_LIBRARY})
set(prefcnt_SRCS prefcnt.c)
add_executable(prefcnt ${prefcnt_SRCS})
target_link_libraries(prefcnt dwarves)
set(scncopy_SRCS scncopy.c elfcreator.c)
add_executable(scncopy ${scncopy_SRCS})
target_link_libraries(scncopy dwarves ${ELF_LIBRARY})
set(syscse_SRCS syscse.c)
add_executable(syscse ${syscse_SRCS})
target_link_libraries(syscse dwarves)
install(TARGETS codiff ctracer dtagnames pahole pdwtags
pfunct pglobal prefcnt scncopy syscse RUNTIME DESTINATION
${CMAKE_INSTALL_PREFIX}/bin)
install(TARGETS dwarves LIBRARY DESTINATION ${LIB_INSTALL_DIR})
install(TARGETS dwarves dwarves_emit dwarves_reorganize LIBRARY DESTINATION ${LIB_INSTALL_DIR})
install(FILES dwarves.h dwarves_emit.h dwarves_reorganize.h
dutil.h gobuffer.h list.h rbtree.h strings.h
DESTINATION ${CMAKE_INSTALL_PREFIX}/include/dwarves/)
install(FILES man-pages/pahole.1 DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1/)
install(PROGRAMS ostra/ostra-cg DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
install(FILES ostra/python/ostra.py DESTINATION ${CMAKE_INSTALL_PREFIX}/share/dwarves/runtime/python)
install(FILES lib/Makefile lib/ctracer_relay.c lib/ctracer_relay.h lib/linux.blacklist.cu
DESTINATION ${CMAKE_INSTALL_PREFIX}/share/dwarves/runtime)
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