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Patch adds support to allow plugins to map selected subset of sections to unique

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segments.


2012-08-24  Sriraman Tallam  <tmsriram@google.com>

	* gold.cc (queue_middle_tasks): Call layout again when unique
	segments for sections is desired.
	* layout.cc (Layout::Layout): Initialize new members.
	(Layout::get_output_section_flags): New function.
	(Layout::choose_output_section): Call get_output_section_flags.
	(Layout::layout): Make output section for mapping to a unique segment.
	(Layout::insert_section_segment_map): New function.
	(Layout::attach_allocated_section_to_segment): Make unique segment for
	output sections marked so.
	(Layout::segment_precedes): Check for unique segments when sorting.
	* layout.h (Layout::Unique_segment_info): New struct.
	(Layout::Section_segment_map): New typedef.
	(Layout::insert_section_segment_map): New function.
	(Layout::get_output_section_flags): New function.
	(Layout::is_unique_segment_for_sections_specified): New function.
	(Layout::set_unique_segment_for_sections_specified): New function.
	(Layout::unique_segment_for_sections_specified_): New member.
	(Layout::section_segment_map_): New member.
	* object.cc (Sized_relobj_file<size, big_endian>::do_layout):
	Rename is_gc_pass_one to is_pass_one.
	Rename is_gc_pass_two to is_pass_two.
	Rename is_gc_or_icf to is_two_pass.
	Check for which pass based on whether symbols data is present.
	Make it two pass when unique segments for sections is desired.
	* output.cc (Output_section::Output_section): Initialize new
	members.
	* output.h (Output_section::is_unique_segment): New function.
	(Output_section::set_is_unique_segment): New function.
	(Output_section::is_unique_segment_): New member.
	(Output_section::extra_segment_flags): New function.
	(Output_section::set_extra_segment_flags): New function.
	(Output_section::extra_segment_flags_): New member.
	(Output_section::segment_alignment): New function.
	(Output_section::set_segment_alignment): New function.
	(Output_section::segment_alignment_): New member.
	(Output_segment::Output_segment): Initialize is_unique_segment_.
	(Output_segment::is_unique_segment): New function.
	(Output_segment::set_is_unique_segment): New function.
	(Output_segment::is_unique_segment_): New member.
	* plugin.cc (allow_unique_segment_for_sections): New function.
	(unique_segment_for_sections): New function.
	(Plugin::load): Add new functions to transfer vector.
	* Makefile.am (plugin_final_layout.readelf.stdout): Add readelf output.
	* Makefile.in: Regenerate.
	* testsuite/plugin_final_layout.sh: Check if unique segment
	functionality works.
	* testsuite/plugin_section_order.c (onload): Check if new interfaces
	are available.
	(allow_unique_segment_for_sections): New global.
	(unique_segment_for_sections): New global.
	(claim_file_hook): Call allow_unique_segment_for_sections.
	(all_symbols_read_hook): Call unique_segment_for_sections.


2012-08-24  Sriraman Tallam  <tmsriram@google.com>

	* plugin-api.h (ld_plugin_allow_unique_segment_for_sections):
	New interface.
	(ld_plugin_unique_segment_for_sections): New interface.
	(LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
	(LDPT_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
	(tv_allow_unique_segment_for_sections): New member.
	(tv_unique_segment_for_sections): New member.
This commit is contained in:
Sriraman Tallam 2012-08-24 18:35:35 +00:00
parent c79316b3f1
commit 3883a0743b
2 changed files with 42 additions and 1 deletions
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10
include/ChangeLog
View File

@ -1,3 +1,13 @@
2012-08-24 Sriraman Tallam <tmsriram@google.com>
* plugin-api.h (ld_plugin_allow_unique_segment_for_sections):
New interface.
(ld_plugin_unique_segment_for_sections): New interface.
(LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
(LDPT_UNIQUE_SEGMENT_FOR_SECTIONS): New enum val.
(tv_allow_unique_segment_for_sections): New member.
(tv_unique_segment_for_sections): New member.
2012-08-24 Matthew Gretton-Dann <matthew.gretton-dann@arm.com>
* opcode/arm.h (ARM_CPU_IS_ANY): New define.

33
include/plugin-api.h
View File

@ -318,6 +318,33 @@ typedef
enum ld_plugin_status
(*ld_plugin_allow_section_ordering) (void);
/* The linker's interface for specifying that a subset of sections is
to be mapped to a unique segment. If the plugin wants to call
unique_segment_for_sections, it must call this function from a
claim_file_handler or when it is first loaded. */
typedef
enum ld_plugin_status
(*ld_plugin_allow_unique_segment_for_sections) (void);
/* The linker's interface for specifying that a specific set of sections
must be mapped to a unique segment. ELF segments do not have names
and the NAME is used as the name of the newly created output section
that is then placed in the unique PT_LOAD segment. FLAGS is used to
specify if any additional segment flags need to be set. For instance,
a specific segment flag can be set to identify this segment. Unsetting
segment flags that would be set by default is not possible. The
parameter SEGMENT_ALIGNMENT when non-zero will override the default. */
typedef
enum ld_plugin_status
(*ld_plugin_unique_segment_for_sections) (
const char* segment_name,
uint64_t segment_flags,
uint64_t segment_alignment,
const struct ld_plugin_section * section_list,
unsigned int num_sections);
enum ld_plugin_level
{
LDPL_INFO,
@ -355,7 +382,9 @@ enum ld_plugin_tag
LDPT_GET_INPUT_SECTION_CONTENTS,
LDPT_UPDATE_SECTION_ORDER,
LDPT_ALLOW_SECTION_ORDERING,
LDPT_GET_SYMBOLS_V2
LDPT_GET_SYMBOLS_V2,
LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS,
LDPT_UNIQUE_SEGMENT_FOR_SECTIONS
};
/* The plugin transfer vector. */
@ -385,6 +414,8 @@ struct ld_plugin_tv
ld_plugin_get_input_section_contents tv_get_input_section_contents;
ld_plugin_update_section_order tv_update_section_order;
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;
} tv_u;
};