ELF раздел не связан - PullRequest
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ELF раздел не связан

1 голос
/ 22 января 2020

У меня проблемы с компоновщиком GNU.

Короче говоря, у меня есть один объект, который имеет секцию .yksir_ykpack ELF, которая связана с объектом, который имеет .yksir_yktrace ELF раздел. Желаемый результат - двоичный файл с обоими этими разделами.

Вот объект с разделом .yksir_ykpack: 

readelf --section-headers /home/vext01/research/yk/target/debug/deps/libykpack-2a9122d94a2f837e.rlib 2>/dev/null
...
File: /home/vext01/research/yk/target/debug/deps/libykpack-2a9122d94a2f837e.rlib(ykpack-2a9122d94a2f837e.4kxe4998mamwcrkf.rcgu.o)
There are 6 section headers, starting at offset 0xc25f8:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .strtab           STRTAB           0000000000000000  000c2580
       0000000000000074  0000000000000000           0     0     1
  [ 2] .text             PROGBITS         0000000000000000  00000040
       0000000000000000  0000000000000000  AX       0     0     4
  [ 3] .yksir_ykpack     PROGBITS         0000000000000000  00000040
       00000000000c24f5  0000000000000000           0     0     16
  [ 4] .note.GNU-stack   PROGBITS         0000000000000000  000c2535
       0000000000000000  0000000000000000           0     0     1
  [ 5] .symtab           SYMTAB           0000000000000000  000c2538
       0000000000000048  0000000000000018           1     2     8
...

Обратите внимание, что этот объект является Rust Rlib, но он совместим с ELF. .

Также обратите внимание, что в rlib есть и другие «подфайлы». Я удалил их.

Другой связанный объект (содержащий .yksir_yktrace) - это обычный .o файл.

И так как мои имена разделов не будут распознаваться сценарием компоновщика по умолчанию Я использовал директивы раздела (inline asm). Например, для .yksir_ykpack: 

.section .yksir_ykpack, "", @progbits

Теперь вот наша командная строка компоновщика (извините, она длинная - сложно сделать минимальный пример в моей настройке): 

cc \
-Wl,--as-needed \
-Wl,-z,noexecstack \
-m64 \
-L \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.10c166lfq64r2e3y.rcgu.o \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.10qcnu2sbqobows0.rcgu.o \
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/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.14rek8asgh23tnza.rcgu.o \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.154hfu34te2ge40t.rcgu.o \
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/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.s6ldoaew31npivj.rcgu.o \
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/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.xp7r6sx9ppyf9t0.rcgu.o \
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/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.zwjbkly56hl6j7y.rcgu.o \
-o \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8 \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.3qhbgyy4j5mr4hcm.rcgu.o \
-pie \
-Wl,-zrelro \
-Wl,-znow \
-nodefaultlibs \
-L \
/home/vext01/research/yk/target/debug/deps \
-L \
/home/vext01/research/yk/target/debug/build/hwtracer-928324455c3b5b0d/out \
-L \
/home/vext01/.cargo/git/checkouts/hwtracer-07feaf5fa95de145/fdce391/c_deps/inst/lib \
-L \
/home/vext01/research/yk/target/debug/build/hwtracer-928324455c3b5b0d/out \
-L \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib \
-Wl,-Bstatic \
/home/vext01/research/yk/target/debug/deps/libmemmap-5f23cb5259f61858.rlib \
/home/vext01/research/yk/target/debug/deps/libgimli-d46f6b1d6250e62c.rlib \
/home/vext01/research/yk/target/debug/deps/libindexmap-a7445e071182095b.rlib \
/home/vext01/research/yk/target/debug/deps/libarrayvec-4d4c4abac05eec7a.rlib \
/home/vext01/research/yk/target/debug/deps/libnodrop-3da1b04b3cad85a5.rlib \
/home/vext01/research/yk/target/debug/deps/libstable_deref_trait-7630eaff18b8ab57.rlib \
/home/vext01/research/yk/target/debug/deps/libelf-97ced5ab8064f12b.rlib \
/home/vext01/research/yk/target/debug/deps/libbyteorder-a1ca60651d3abac3.rlib \
/home/vext01/research/yk/target/debug/deps/libphdrs-b9f0bd244ef345ca.rlib \
/home/vext01/research/yk/target/debug/deps/libobject-78dffdc0007e71b6.rlib \
/home/vext01/research/yk/target/debug/deps/libparity_wasm-6e118c1ea26bb0ca.rlib \
/home/vext01/research/yk/target/debug/deps/libflate2-a0dbcb32ab5b92bb.rlib \
/home/vext01/research/yk/target/debug/deps/libminiz_oxide-feee87a1e827d34e.rlib \
/home/vext01/research/yk/target/debug/deps/libadler32-df5c7e6116a31c83.rlib \
/home/vext01/research/yk/target/debug/deps/libcrc32fast-e74dc8ce28b7f377.rlib \
/home/vext01/research/yk/target/debug/deps/libgoblin-31c3e1931784d72b.rlib \
/home/vext01/research/yk/target/debug/deps/liblog-6bd6a1a9417c9b44.rlib \
/home/vext01/research/yk/target/debug/deps/libplain-815d5b934f3c458c.rlib \
/home/vext01/research/yk/target/debug/deps/libscroll-57c304c9c9aa4f19.rlib \
/home/vext01/research/yk/target/debug/deps/libuuid-d9fa09a0ac505087.rlib \
/home/vext01/research/yk/target/debug/deps/libtarget_lexicon-bd6c9c95040de744.rlib \
/home/vext01/research/yk/target/debug/deps/libfailure-883b6313101c519f.rlib \
/home/vext01/research/yk/target/debug/deps/libhwtracer-4a7fcfc6cdb25d08.rlib \
/home/vext01/research/yk/target/debug/deps/libtempfile-f73c3fca6b62eb80.rlib \
/home/vext01/research/yk/target/debug/deps/librand-df0ca11adb03b8e3.rlib \
/home/vext01/research/yk/target/debug/deps/librand_chacha-276a59e9166a9193.rlib \
/home/vext01/research/yk/target/debug/deps/libc2_chacha-170e0ce215266f6e.rlib \
/home/vext01/research/yk/target/debug/deps/libppv_lite86-8dd4ff65271756be.rlib \
/home/vext01/research/yk/target/debug/deps/librand_core-4c118f0513457ff6.rlib \
/home/vext01/research/yk/target/debug/deps/libgetrandom-a724117bf2304247.rlib \
/home/vext01/research/yk/target/debug/deps/libremove_dir_all-635dd99a7c406912.rlib \
/home/vext01/research/yk/target/debug/deps/libcfg_if-6454a07998dfdf77.rlib \
/home/vext01/research/yk/target/debug/deps/libtime-de6100a3b17d5591.rlib \
/home/vext01/research/yk/target/debug/deps/liblibc-7376e8de49ab6c4d.rlib \
/home/vext01/research/yk/target/debug/deps/libykpack-2a9122d94a2f837e.rlib \
/home/vext01/research/yk/target/debug/deps/librmp_serde-337cde3a4d7cf067.rlib \
/home/vext01/research/yk/target/debug/deps/libserde-af0b54eec19c1f21.rlib \
/home/vext01/research/yk/target/debug/deps/librmp-3e2e145986c5b5a2.rlib \
/home/vext01/research/yk/target/debug/deps/libnum_traits-e132ced7a5978735.rlib \
/home/vext01/research/yk/target/debug/deps/libbyteorder-06c02cccfe57c005.rlib \
/home/vext01/research/yk/target/debug/deps/libfallible_iterator-72f65c2f6c00d6f7.rlib \
/home/vext01/research/yk/target/debug/deps/liblazy_static-40baa21fb02fe58c.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-fa7c5db992c603ae.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-677b7a33a112844b.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-3823ca10bcc34fef.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-b085949ade5be118.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-937f89c7b4331592.rlib \
-Wl,--start-group \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-d5a0f5d9c2ecbc13.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-6214af4642f83019.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-d853b38ef82d1b80.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-b5c8492ce140f2f4.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-4f884e18d6db8201.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-55bf2675880f6c0f.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-e80dead6761c88af.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-a0079eacbe814aa8.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-eaebc19628616584.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-041597c76bfe99c8.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-4f9776276b6dc54c.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-f0c8c9c0de0535e4.rlib \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-cf28f55e983f3931.rlib \
-Wl,--end-group \
/home/vext01/research/ykrustc/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-f4dd3b487c184fe0.rlib \
-Wl,-Bdynamic \
-lipt \
-lutil \
-lutil \
-ldl \
-lrt \
-lpthread \
-lgcc_s \
-lc \
-lm \
-lrt \
-lpthread \
-lutil \
-lutil \
-Wl,--no-gc-sections \
/home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8.2qajgdgxxha7pskm.rcgu.o

Это успешно, но когда мы проверяем получившийся двоичный файл, .yksir_ykpack отсутствует: 

$ readelf --section-headers /home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8 2>/dev/null | grep 'yksir_ykpack'
$

Секция .yksir_yktrace - это в двоичном файле, хотя: 

$ readelf --section-headers /home/vext01/research/yk/target/debug/deps/yktrace-191ae338a3a7cbe8 2>/dev/null | grep 'yksir_yktrace'
...
  [31] .yksir_yktrace    PROGBITS         0000000000000000  009ba0e0
       0000000000078ed3  0000000000000000           0     0     16

Кто-нибудь знает, почему это так? Откуда .yksir_ykpack go?

Я пытался удалить -Wl,--as-needed и продвинуться вверх -Wl,--no-gc-sections. Никакой радости.

Спасибо!

1 Ответ

0 голосов
/ 24 января 2020

Я понял это.

Важная деталь здесь заключается в том, что файлы Rust .rlib являются stati c библиотеками. В отличие от объектных файлов .o, при связывании библиотеки stati c (обычно это файл .a) компоновщик использует шаг разрешения для извлечения только пока еще неопределенных символов и ничего больше.

Это может можно увидеть, используя этот минимальный пример: 

all: main_a main_o main_a_whole dump

# Generate text files to use as the contents of the sections.
my_section1.raw:
    echo "mydata1" > $@

my_section2.raw:
    echo "mydata2" > $@

# Generate object files for the sections.
my_section1.o: my_section1.raw
    objcopy --input-target binary \
        --output-target=elf64-x86-64 \
        --binary-architecture i386:x86-64 \
        --rename-section .data=.my_section1 \
        my_section1.raw $@

my_section2.o: my_section2.raw
    objcopy --input-target binary \
        --output-target=elf64-x86-64 \
        --binary-architecture i386:x86-64 \
        --rename-section .data=.my_section2 \
        my_section2.raw $@

# And for section1 only, we will make a static lib.
my_section1.a: my_section1.o
    ar rcs $@ my_section1.o

# A "main" stub to link our objects to.
main.c:
    echo "void main(void) {}" > main.c

# Now make some binaries using varying linkage configurations.
# main_o is made from the object files.
main_o: main.o my_section1.a my_section2.o
    ${CC} -o $@ my_section1.o my_section2.o main.o

# main_a uses the static lib for section1 and the object file for section2.
main_a: main.o my_section1.a my_section2.o
    ${CC} -o $@ my_section1.a my_section2.o main.o

# main_a_whole is the same as main_a, but uses --whole-archive when linking section1.
main_a_whole: main.o my_section1.a my_section2.o
    ${CC} -o $@ -Wl,--whole-archive my_section1.a -Wl,--no-whole-archive my_section2.o main.o

# Print the sections of interest from the resulting binaries.
dump:
    @echo "\n>>> main_o sections"
    objdump -h main_o | grep my_section

    @echo "\n>>> main_a sections"
    objdump -h main_a | grep my_section

    @echo "\n>>> main_a_whole sections"
    objdump -h main_a_whole | grep my_section

clean:
    rm -f *.o *.a main_a main_o main_a_whole *.raw main.c

При запуске мы получаем: 

>>> main_o sections
objdump -h main_o | grep my_section
 23 .my_section1  00000008  0000000000004028  0000000000004028  00003028  2**0
 24 .my_section2  00000008  0000000000004030  0000000000004030  00003030  2**0

>>> main_a sections
objdump -h main_a | grep my_section
 23 .my_section2  00000008  0000000000004028  0000000000004028  00003028  2**0

>>> main_a_whole sections
objdump -h main_a_whole | grep my_section
 23 .my_section1  00000008  0000000000004028  0000000000004028  00003028  2**0
 24 .my_section2  00000008  0000000000004030  0000000000004030  00003030  2**0

Обратите внимание на использование --whole-archive для принудительной загрузки всей таблицы * stati c lib , Это может быть нежелательно, так как вы можете sh полностью связать только один раздел, что нельзя сделать напрямую AFAICS. В таком случае вы можете извлечь раздел, используя ar или objcopy и связать его вместо этого.

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