Add new plugin hooks to support querying section alignment and size.
include/ 2016-03-03 Than McIntosh <thanm@google.com> * plugin-api.h: Add new hooks to the plugin transfer vector to to support querying section alignment and section size. (ld_plugin_get_input_section_alignment): New hook. (ld_plugin_get_input_section_size): New hook. (ld_plugin_tag): Add LDPT_GET_INPUT_SECTION_ALIGNMENT and LDPT_GET_INPUT_SECTION_SIZE. (ld_plugin_tv): Add tv_get_input_section_alignment and tv_get_input_section_size. gold/ 2016-03-03 Than McIntosh <thanm@google.com> * plugin.cc (Plugin::load): Include hooks for get_input_section_size and get_input_section_alignment in transfer vector. (get_input_section_alignment): New function. (get_input_section_size): New function. * testsuite/Makefile.am: Add plugin_layout_with_alignment.sh test. * testsuite/Makefile.in: [Regenerate.] * testsuite/plugin_section_alignment.cc: New test file. * testsuite/plugin_layout_with_alignment.cc: New test file. * testsuite/plugin_layout_with_alignment.sh: New test file.
This commit is contained in:
Cary Coutant
parent
95ecdfbfcb
commit
82838bd626
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@ -158,6 +158,15 @@ unique_segment_for_sections(const char* segment_name,
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uint64_t align,
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const struct ld_plugin_section *section_list,
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unsigned int num_sections);
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static enum ld_plugin_status
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get_input_section_alignment(const struct ld_plugin_section section,
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unsigned int* addralign);
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static enum ld_plugin_status
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get_input_section_size(const struct ld_plugin_section section,
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uint64_t* secsize);
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};
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#endif // ENABLE_PLUGINS
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@ -202,7 +211,7 @@ Plugin::load()
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sscanf(ver, "%d.%d", &major, &minor);
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// Allocate and populate a transfer vector.
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const int tv_fixed_size = 27;
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const int tv_fixed_size = 29;
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int tv_size = this->args_.size() + tv_fixed_size;
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ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
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@ -328,6 +337,14 @@ Plugin::load()
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tv[i].tv_tag = LDPT_UNIQUE_SEGMENT_FOR_SECTIONS;
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tv[i].tv_u.tv_unique_segment_for_sections = unique_segment_for_sections;
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++i;
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tv[i].tv_tag = LDPT_GET_INPUT_SECTION_ALIGNMENT;
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tv[i].tv_u.tv_get_input_section_alignment = get_input_section_alignment;
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++i;
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tv[i].tv_tag = LDPT_GET_INPUT_SECTION_SIZE;
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tv[i].tv_u.tv_get_input_section_size = get_input_section_size;
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++i;
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tv[i].tv_tag = LDPT_NULL;
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tv[i].tv_u.tv_val = 0;
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@ -1730,6 +1747,53 @@ get_input_section_contents(const struct ld_plugin_section section,
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return LDPS_OK;
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}
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// Get the alignment of the specified section in the object corresponding
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// to the handle. This plugin interface can only be called in the
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// claim_file handler of the plugin.
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static enum ld_plugin_status
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get_input_section_alignment(const struct ld_plugin_section section,
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unsigned int* addralign)
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{
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gold_assert(parameters->options().has_plugins());
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if (!parameters->options().plugins()->in_claim_file_handler())
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return LDPS_ERR;
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Object* obj
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= parameters->options().plugins()->get_elf_object(section.handle);
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if (obj == NULL)
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return LDPS_BAD_HANDLE;
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*addralign = obj->section_addralign(section.shndx);
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return LDPS_OK;
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}
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// Get the size of the specified section in the object corresponding
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// to the handle. This plugin interface can only be called in the
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// claim_file handler of the plugin.
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static enum ld_plugin_status
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get_input_section_size(const struct ld_plugin_section section,
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uint64_t* secsize)
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{
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gold_assert(parameters->options().has_plugins());
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if (!parameters->options().plugins()->in_claim_file_handler())
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return LDPS_ERR;
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Object* obj
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= parameters->options().plugins()->get_elf_object(section.handle);
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if (obj == NULL)
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return LDPS_BAD_HANDLE;
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*secsize = obj->section_size(section.shndx);
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return LDPS_OK;
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}
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// Specify the ordering of sections in the final layout. The sections are
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// specified as (handle,shndx) pairs in the two arrays in the order in
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// which they should appear in the final layout.
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@ -2101,6 +2101,21 @@ plugin_section_order.so: plugin_section_order.o
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plugin_section_order.o: plugin_section_order.c
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$(COMPILE) -O0 -c -fpic -o $@ $<
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check_SCRIPTS += plugin_layout_with_alignment.sh
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check_DATA += plugin_layout_with_alignment.stdout
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MOSTLYCLEANFILES += plugin_layout_with_alignment
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plugin_layout_with_alignment.o: plugin_layout_with_alignment.cc
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$(CXXCOMPILE) -O0 -c -ffunction-sections -fdata-sections -g -o $@ $<
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plugin_layout_with_alignment: plugin_layout_with_alignment.o plugin_section_alignment.so gcctestdir/ld
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$(CXXLINK) -Bgcctestdir/ -Wl,--plugin,"./plugin_section_alignment.so" plugin_layout_with_alignment.o
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plugin_layout_with_alignment.stdout: plugin_layout_with_alignment
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$(TEST_NM) -n --synthetic plugin_layout_with_alignment > plugin_layout_with_alignment.stdout
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plugin_section_alignment.so: plugin_section_alignment.o
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$(CXXLINK) -Bgcctestdir/ -shared plugin_section_alignment.o
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plugin_section_alignment.o: plugin_section_alignment.cc
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$(CXXCOMPILE) -O0 -c -fpic -o $@ $<
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endif PLUGINS
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check_PROGRAMS += exclude_libs_test
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@ -474,9 +474,13 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@@TLS_TRUE@am__append_43 = plugin_test_tls.err
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@@TLS_TRUE@am__append_44 = plugin_test_tls.err
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_45 = unused.c \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_final_layout
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_46 = plugin_final_layout.sh
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_47 = plugin_final_layout.stdout plugin_final_layout_readelf.stdout
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_final_layout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_46 = plugin_final_layout.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment.sh
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_47 = plugin_final_layout.stdout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_final_layout_readelf.stdout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment.stdout
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@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_48 = exclude_libs_test \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ local_labels_test \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ discard_locals_test
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@ -4561,6 +4565,8 @@ plugin_test_tls.sh.log: plugin_test_tls.sh
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@p='plugin_test_tls.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
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plugin_final_layout.sh.log: plugin_final_layout.sh
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@p='plugin_final_layout.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
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plugin_layout_with_alignment.sh.log: plugin_layout_with_alignment.sh
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@p='plugin_layout_with_alignment.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
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exclude_libs_test.sh.log: exclude_libs_test.sh
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@p='exclude_libs_test.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
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discard_locals_test.sh.log: discard_locals_test.sh
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@ -6131,6 +6137,17 @@ uninstall-am:
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(LINK) -Bgcctestdir/ -shared plugin_section_order.o
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_section_order.o: plugin_section_order.c
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(COMPILE) -O0 -c -fpic -o $@ $<
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_with_alignment.o: plugin_layout_with_alignment.cc
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(CXXCOMPILE) -O0 -c -ffunction-sections -fdata-sections -g -o $@ $<
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_with_alignment: plugin_layout_with_alignment.o plugin_section_alignment.so gcctestdir/ld
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--plugin,"./plugin_section_alignment.so" plugin_layout_with_alignment.o
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_with_alignment.stdout: plugin_layout_with_alignment
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(TEST_NM) -n --synthetic plugin_layout_with_alignment > plugin_layout_with_alignment.stdout
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_section_alignment.so: plugin_section_alignment.o
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(CXXLINK) -Bgcctestdir/ -shared plugin_section_alignment.o
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_section_alignment.o: plugin_section_alignment.cc
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@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(CXXCOMPILE) -O0 -c -fpic -o $@ $<
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@GCC_TRUE@@NATIVE_LINKER_TRUE@exclude_libs_test.syms: exclude_libs_test
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -sW $< >$@ 2>/dev/null
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@GCC_TRUE@@NATIVE_LINKER_TRUE@libexclude_libs_test_1.a: exclude_libs_test_1.o
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@ -0,0 +1,72 @@
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// plugin_layout_with_alignment.cc -- a test case for gold
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// Copyright (C) 2016 Free Software Foundation, Inc.
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// Written by Than McIntosh <thanm@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// Verify that plugin interfaces for section size and alignment work
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// correctly, and that section ordering via plugins is working
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// for .bss/.rodata/.data sections.
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// --- Initialized .rodata items
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__attribute__ ((section(".rodata.v1_a2")))
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const short rodata_item1 = 101;
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__attribute__ ((section(".rodata.v2_a1")))
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const char rodata_item2 = 'a';
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__attribute__ ((section(".rodata.v3_a8")))
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const double rodata_item3 = 777.777;
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__attribute__ ((section(".rodata.v4_a1")))
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const char rodata_item4[7] = {'1', '2', '3', '4', '5', '6', '7'};
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// --- Initialized .data items
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__attribute__ ((section(".data.v1_a2")))
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short rwdata_item1 = 101;
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__attribute__ ((section(".data.v2_a1")))
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char rwdata_item2 = 'a';
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__attribute__ ((section(".data.v3_a8")))
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double rwdata_item3 = 'b';
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__attribute__ ((section(".data.v4_a1")))
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char rwdata_item4[3] = {'a', 'b', 'c'};
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// --- Uninitialized .data items
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__attribute__ ((section(".bss.v1_a2")))
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short bss_item1;
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__attribute__ ((section(".bss.v2_a1")))
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char bss_item2;
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__attribute__ ((section(".bss.v3_a8")))
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struct blah { union { double d; char c; } u; } bss_item3;
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__attribute__ ((section(".bss.v4_a1")))
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char bss_item4[3];
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int main ()
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{
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return 0;
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}
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@ -0,0 +1,66 @@
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#!/bin/sh
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# plugin_layout_with_alignment.sh -- test
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# Copyright (C) 2016 Free Software Foundation, Inc.
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# Written by Than McIntosh <thanm@google.com>.
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# This file is part of gold.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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# The goal of this program is to verify plugin alignment and size
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# interfaces and working correctly in combination with section ordering.
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# intended. File plugin_layout_with_alignment.cc is in this test.
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set -e
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check()
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{
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awk "
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BEGIN { saw1 = 0; saw2 = 0; saw3 = 0; saw4 = 0; counter = 1; err = 0; ord = \"\"; }
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/.*$2\$/ { saw1 = counter; counter = counter + 1; ord = ord \" $2\"; }
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/.*$3\$/ { saw2 = counter; counter = counter + 1; ord = ord \" $3\"; }
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/.*$4\$/ { saw3 = counter; counter = counter + 1; ord = ord \" $4\"; }
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/.*$5\$/ { saw4 = counter; counter = counter + 1; ord = ord \" $5\"; }
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END {
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if (!saw1) {
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printf \"did not see $2\\n\";
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exit 1;
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}
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if (!saw2) {
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printf \"did not see $3\\n\";
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exit 1;
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}
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if (!saw3) {
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printf \"did not see $4\\n\";
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exit 1;
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}
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if (!saw4) {
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printf \"did not see $5\\n\";
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exit 1;
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}
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if (saw1 != 1 || saw2 != 2 || saw3 != 3 || saw4 != 4) {
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printf \"incorrect ordering:\\nwas:%s\\nshould have been: $2 $3 $4 $5\\n\", ord;
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exit 1;
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}
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}" $1
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}
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check plugin_layout_with_alignment.stdout "bss_item3" "bss_item1" "bss_item4" "bss_item2"
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check plugin_layout_with_alignment.stdout "rwdata_item2" "rwdata_item4" "rwdata_item1" "rwdata_item3"
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check plugin_layout_with_alignment.stdout "rodata_item3" "rodata_item1" "rodata_item2" "rodata_item4"
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@ -0,0 +1,267 @@
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// plugin_section_alignment.cc -- plugins to test ordering with {size,alignment}
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//
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// Copyright (C) 2016 Free Software Foundation, Inc.
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// Written by Than McIntosh <thanm@google.com>.
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//
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// This file is part of gold.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string>
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#include <vector>
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#include <algorithm>
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#include "plugin-api.h"
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static ld_plugin_get_input_section_count get_input_section_count = NULL;
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static ld_plugin_get_input_section_alignment get_input_section_alignment = NULL;
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static ld_plugin_get_input_section_size get_input_section_size = NULL;
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static ld_plugin_get_input_section_name get_input_section_name = NULL;
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static ld_plugin_update_section_order update_section_order = NULL;
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static ld_plugin_allow_section_ordering allow_section_ordering = NULL;
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extern "C" {
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enum ld_plugin_status onload(struct ld_plugin_tv *tv);
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enum ld_plugin_status claim_file_hook(const struct ld_plugin_input_file *file,
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int *claimed);
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enum ld_plugin_status all_symbols_read_hook(void);
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}
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typedef enum { FL_BSS, FL_DATA, FL_RODATA, FL_UNKNOWN } sec_flavor;
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inline static int is_prefix_of(const char *prefix, const char *str)
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{
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return strncmp(prefix, str, strlen(prefix)) == 0;
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}
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inline static sec_flavor flavor_from_name(const char *secname)
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{
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if (is_prefix_of(".data.v", secname)) {
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return FL_DATA;
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} else if (is_prefix_of(".bss.v", secname)) {
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return FL_BSS;
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} else if (is_prefix_of(".rodata.v", secname)) {
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return FL_RODATA;
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} else {
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return FL_UNKNOWN;
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}
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}
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struct SectionInfo {
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ld_plugin_section plugin_section;
|
||||
std::string name;
|
||||
uint64_t size;
|
||||
sec_flavor flavor;
|
||||
unsigned align;
|
||||
|
||||
static bool SectionInfoLt(const SectionInfo &i1,
|
||||
const SectionInfo &i2)
|
||||
{
|
||||
if (i1.flavor != i2.flavor) {
|
||||
return ((unsigned) i1.flavor) < ((unsigned) i2.flavor);
|
||||
}
|
||||
switch (i1.flavor) {
|
||||
case FL_DATA:
|
||||
// Sort data items by increasing alignment then increasing size
|
||||
if (i1.align != i2.align) {
|
||||
return ((unsigned) i1.align) < ((unsigned) i2.align);
|
||||
}
|
||||
if (i1.size != i2.size) {
|
||||
return ((unsigned) i1.size) < ((unsigned) i2.size);
|
||||
}
|
||||
break;
|
||||
case FL_BSS:
|
||||
// Sort bss items by decreasing alignment then decreasing size
|
||||
if (i1.align != i2.align) {
|
||||
return ((unsigned) i2.align) < ((unsigned) i1.align);
|
||||
}
|
||||
if (i1.size != i2.size) {
|
||||
return ((unsigned) i2.size) < ((unsigned) i1.size);
|
||||
}
|
||||
break;
|
||||
case FL_RODATA:
|
||||
// Sort rodata items by decreasing alignment then increasing size
|
||||
if (i1.align != i2.align) {
|
||||
return ((unsigned) i2.align) < ((unsigned) i1.align);
|
||||
}
|
||||
if (i1.size != i2.size) {
|
||||
return ((unsigned) i1.size) < ((unsigned) i2.size);
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
// Break ties by name
|
||||
return i1.name.compare(i2.name) < 0;
|
||||
}
|
||||
|
||||
};
|
||||
typedef std::vector<SectionInfo> section_info_vector;
|
||||
section_info_vector raw_sections;
|
||||
|
||||
// Set to 1 for debugging output
|
||||
unsigned trace = 0;
|
||||
|
||||
extern "C" {
|
||||
|
||||
// Plugin entry point.
|
||||
enum ld_plugin_status onload(struct ld_plugin_tv *tv)
|
||||
{
|
||||
struct ld_plugin_tv *entry;
|
||||
for (entry = tv; entry->tv_tag != LDPT_NULL; ++entry)
|
||||
{
|
||||
switch (entry->tv_tag)
|
||||
{
|
||||
case LDPT_OPTION:
|
||||
if (!strcmp(entry->tv_u.tv_string,"-trace")) {
|
||||
fprintf(stderr, "enabling tracing\n");
|
||||
trace += 1;
|
||||
} else {
|
||||
fprintf(stderr, "unknown plugin option %s", entry->tv_u.tv_string);
|
||||
}
|
||||
break;
|
||||
case LDPT_REGISTER_CLAIM_FILE_HOOK:
|
||||
assert((*entry->tv_u.tv_register_claim_file)(claim_file_hook) ==
|
||||
LDPS_OK);
|
||||
break;
|
||||
case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
|
||||
assert((*entry->tv_u.tv_register_all_symbols_read)(
|
||||
all_symbols_read_hook) == LDPS_OK);
|
||||
break;
|
||||
case LDPT_GET_INPUT_SECTION_COUNT:
|
||||
get_input_section_count = *entry->tv_u.tv_get_input_section_count;
|
||||
break;
|
||||
case LDPT_GET_INPUT_SECTION_NAME:
|
||||
get_input_section_name = *entry->tv_u.tv_get_input_section_name;
|
||||
break;
|
||||
case LDPT_GET_INPUT_SECTION_ALIGNMENT:
|
||||
get_input_section_alignment =
|
||||
*entry->tv_u.tv_get_input_section_alignment;
|
||||
break;
|
||||
case LDPT_GET_INPUT_SECTION_SIZE:
|
||||
get_input_section_size = *entry->tv_u.tv_get_input_section_size;
|
||||
break;
|
||||
case LDPT_UPDATE_SECTION_ORDER:
|
||||
update_section_order = *entry->tv_u.tv_update_section_order;
|
||||
break;
|
||||
case LDPT_ALLOW_SECTION_ORDERING:
|
||||
allow_section_ordering = *entry->tv_u.tv_allow_section_ordering;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (get_input_section_count == NULL || get_input_section_alignment == NULL ||
|
||||
get_input_section_size == NULL || get_input_section_name == NULL ||
|
||||
update_section_order == NULL || allow_section_ordering == NULL) {
|
||||
fprintf(stderr, "Some interfaces are missing\n");
|
||||
return LDPS_ERR;
|
||||
}
|
||||
|
||||
return LDPS_OK;
|
||||
}
|
||||
|
||||
// This function is called by the linker for every new object it encounters.
|
||||
enum ld_plugin_status claim_file_hook(const struct ld_plugin_input_file *file,
|
||||
int *claimed)
|
||||
{
|
||||
static bool is_ordering_specified = false;
|
||||
struct ld_plugin_section section;
|
||||
unsigned count = 0;
|
||||
unsigned shndx;
|
||||
|
||||
*claimed = 0;
|
||||
if (!is_ordering_specified) {
|
||||
// Inform the linker to prepare for section reordering.
|
||||
(*allow_section_ordering)();
|
||||
is_ordering_specified = true;
|
||||
}
|
||||
|
||||
(*get_input_section_count)(file->handle, &count);
|
||||
|
||||
for (shndx = 0; shndx < count; ++shndx) {
|
||||
char *name = NULL;
|
||||
|
||||
section.handle = file->handle;
|
||||
section.shndx = shndx;
|
||||
(*get_input_section_name)(section, &name);
|
||||
if (is_prefix_of(".data.v", name) ||
|
||||
is_prefix_of(".bss.v", name) ||
|
||||
is_prefix_of(".rodata.v", name)) {
|
||||
SectionInfo si;
|
||||
si.plugin_section.handle = file->handle;
|
||||
si.plugin_section.shndx = shndx;
|
||||
(*get_input_section_size)(section, &si.size);
|
||||
(*get_input_section_alignment)(section, &si.align);
|
||||
si.name = name;
|
||||
si.flavor = flavor_from_name(name);
|
||||
raw_sections.push_back(si);
|
||||
}
|
||||
}
|
||||
|
||||
return LDPS_OK;
|
||||
}
|
||||
|
||||
// This function is called by the linker after all the symbols have been read.
|
||||
// At this stage, it is fine to tell the linker the desired function order.
|
||||
|
||||
enum ld_plugin_status all_symbols_read_hook(void)
|
||||
{
|
||||
// We expect to see a total of twelve sections -- if this is not the case
|
||||
// then something went wrong somewhere along the way.
|
||||
if (raw_sections.size() != 12) {
|
||||
fprintf(stderr, "Expected 12 sections, found %u sections",
|
||||
(unsigned) raw_sections.size());
|
||||
return LDPS_ERR;
|
||||
}
|
||||
|
||||
std::sort(raw_sections.begin(), raw_sections.end(),
|
||||
SectionInfo::SectionInfoLt);
|
||||
|
||||
struct ld_plugin_section section_list[12];
|
||||
for (unsigned ii = 0; ii < 12; ++ii) {
|
||||
section_list[ii] = raw_sections[ii].plugin_section;
|
||||
}
|
||||
|
||||
if (trace) {
|
||||
fprintf(stderr, "Specified section order is:\n");
|
||||
for (section_info_vector::iterator it = raw_sections.begin();
|
||||
it != raw_sections.end();
|
||||
++it) {
|
||||
const SectionInfo &si = (*it);
|
||||
fprintf(stderr, "Idx=%u Name=%s Align=%u Size=%u\n",
|
||||
si.plugin_section.shndx, si.name.c_str(), si.align,
|
||||
(unsigned) si.size);
|
||||
}
|
||||
}
|
||||
|
||||
update_section_order(section_list, 12);
|
||||
|
||||
return LDPS_OK;
|
||||
}
|
||||
|
||||
} // end extern "C"
|
||||
|
|
@ -345,6 +345,26 @@ enum ld_plugin_status
|
|||
const struct ld_plugin_section * section_list,
|
||||
unsigned int num_sections);
|
||||
|
||||
/* The linker's interface for retrieving the section alignment requirement
|
||||
of a specific section in an object. This interface should only be invoked in the
|
||||
claim_file handler. This function sets *ADDRALIGN to the ELF sh_addralign
|
||||
value of the input section. */
|
||||
|
||||
typedef
|
||||
enum ld_plugin_status
|
||||
(*ld_plugin_get_input_section_alignment) (const struct ld_plugin_section section,
|
||||
unsigned int *addralign);
|
||||
|
||||
/* The linker's interface for retrieving the section size of a specific section
|
||||
in an object. This interface should only be invoked in the claim_file handler.
|
||||
This function sets *SECSIZE to the ELF sh_size
|
||||
value of the input section. */
|
||||
|
||||
typedef
|
||||
enum ld_plugin_status
|
||||
(*ld_plugin_get_input_section_size) (const struct ld_plugin_section section,
|
||||
uint64_t *secsize);
|
||||
|
||||
enum ld_plugin_level
|
||||
{
|
||||
LDPL_INFO,
|
||||
|
|
@ -385,7 +405,9 @@ enum ld_plugin_tag
|
|||
LDPT_GET_SYMBOLS_V2 = 25,
|
||||
LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS = 26,
|
||||
LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27,
|
||||
LDPT_GET_SYMBOLS_V3 = 28
|
||||
LDPT_GET_SYMBOLS_V3 = 28,
|
||||
LDPT_GET_INPUT_SECTION_ALIGNMENT = 29,
|
||||
LDPT_GET_INPUT_SECTION_SIZE = 30
|
||||
};
|
||||
|
||||
/* The plugin transfer vector. */
|
||||
|
|
@ -417,6 +439,8 @@ struct ld_plugin_tv
|
|||
ld_plugin_allow_section_ordering tv_allow_section_ordering;
|
||||
ld_plugin_allow_unique_segment_for_sections tv_allow_unique_segment_for_sections;
|
||||
ld_plugin_unique_segment_for_sections tv_unique_segment_for_sections;
|
||||
ld_plugin_get_input_section_alignment tv_get_input_section_alignment;
|
||||
ld_plugin_get_input_section_size tv_get_input_section_size;
|
||||
} tv_u;
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue