aboutsummaryrefslogtreecommitdiff
path: root/gold/layout.h
diff options
context:
space:
mode:
Diffstat (limited to 'gold/layout.h')
-rw-r--r--gold/layout.h133
1 files changed, 115 insertions, 18 deletions
diff --git a/gold/layout.h b/gold/layout.h
index 60ae114..b5b266c 100644
--- a/gold/layout.h
+++ b/gold/layout.h
@@ -286,6 +286,107 @@ class Kept_section
} u_;
};
+// The ordering for output sections. This controls how output
+// sections are ordered within a PT_LOAD output segment.
+
+enum Output_section_order
+{
+ // Unspecified. Used for non-load segments. Also used for the file
+ // and segment headers.
+ ORDER_INVALID,
+
+ // The PT_INTERP section should come first, so that the dynamic
+ // linker can pick it up quickly.
+ ORDER_INTERP,
+
+ // Loadable read-only note sections come next so that the PT_NOTE
+ // segment is on the first page of the executable.
+ ORDER_RO_NOTE,
+
+ // Put read-only sections used by the dynamic linker early in the
+ // executable to minimize paging.
+ ORDER_DYNAMIC_LINKER,
+
+ // Put reloc sections used by the dynamic linker after other
+ // sections used by the dynamic linker; otherwise, objcopy and strip
+ // get confused.
+ ORDER_DYNAMIC_RELOCS,
+
+ // Put the PLT reloc section after the other dynamic relocs;
+ // otherwise, prelink gets foncused.
+ ORDER_DYNAMIC_PLT_RELOCS,
+
+ // The .init section.
+ ORDER_INIT,
+
+ // The PLT.
+ ORDER_PLT,
+
+ // The regular text sections.
+ ORDER_TEXT,
+
+ // The .fini section.
+ ORDER_FINI,
+
+ // The read-only sections.
+ ORDER_READONLY,
+
+ // The exception frame sections.
+ ORDER_EHFRAME,
+
+ // The TLS sections come first in the data section.
+ ORDER_TLS_DATA,
+ ORDER_TLS_BSS,
+
+ // Local RELRO (read-only after relocation) sections come before
+ // non-local RELRO sections. This data will be fully resolved by
+ // the prelinker.
+ ORDER_RELRO_LOCAL,
+
+ // Non-local RELRO sections are grouped together after local RELRO
+ // sections. All RELRO sections must be adjacent so that they can
+ // all be put into a PT_GNU_RELRO segment.
+ ORDER_RELRO,
+
+ // We permit marking exactly one output section as the last RELRO
+ // section. We do this so that the read-only GOT can be adjacent to
+ // the writable GOT.
+ ORDER_RELRO_LAST,
+
+ // Similarly, we permit marking exactly one output section as the
+ // first non-RELRO section.
+ ORDER_NON_RELRO_FIRST,
+
+ // The regular data sections come after the RELRO sections.
+ ORDER_DATA,
+
+ // Large data sections normally go in large data segments.
+ ORDER_LARGE_DATA,
+
+ // Group writable notes so that we can have a single PT_NOTE
+ // segment.
+ ORDER_RW_NOTE,
+
+ // The small data sections must be at the end of the data sections,
+ // so that they can be adjacent to the small BSS sections.
+ ORDER_SMALL_DATA,
+
+ // The BSS sections start here.
+
+ // The small BSS sections must be at the start of the BSS sections,
+ // so that they can be adjacent to the small data sections.
+ ORDER_SMALL_BSS,
+
+ // The regular BSS sections.
+ ORDER_BSS,
+
+ // The large BSS sections come after the other BSS sections.
+ ORDER_LARGE_BSS,
+
+ // Maximum value.
+ ORDER_MAX
+};
+
// This class handles the details of laying out input sections.
class Layout
@@ -371,18 +472,14 @@ class Layout
layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
// Add an Output_section_data to the layout. This is used for
- // special sections like the GOT section. IS_DYNAMIC_LINKER_SECTION
- // is true for sections which are used by the dynamic linker, such
- // as dynamic reloc sections. IS_RELRO is true for relro sections.
- // IS_LAST_RELRO is true for the last relro section.
- // IS_FIRST_NON_RELRO is true for the first section after the relro
- // sections.
+ // special sections like the GOT section. ORDER is where the
+ // section should wind up in the output segment. IS_RELRO is true
+ // for relro sections.
Output_section*
add_output_section_data(const char* name, elfcpp::Elf_Word type,
elfcpp::Elf_Xword flags,
- Output_section_data*, bool is_dynamic_linker_section,
- bool is_relro, bool is_last_relro,
- bool is_first_non_relro);
+ Output_section_data*, Output_section_order order,
+ bool is_relro);
// Increase the size of the relro segment by this much.
void
@@ -788,29 +885,29 @@ class Layout
Output_section*
get_output_section(const char* name, Stringpool::Key name_key,
elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
- bool is_interp, bool is_dynamic_linker_section,
- bool is_relro, bool is_last_relro,
- bool is_first_non_relro);
+ Output_section_order order, bool is_relro);
// Choose the output section for NAME in RELOBJ.
Output_section*
choose_output_section(const Relobj* relobj, const char* name,
elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
- bool is_input_section, bool is_interp,
- bool is_dynamic_linker_section, bool is_relro,
- bool is_last_relro, bool is_first_non_relro);
+ bool is_input_section, Output_section_order order,
+ bool is_relro);
// Create a new Output_section.
Output_section*
make_output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags, bool is_interp,
- bool is_dynamic_linker_section, bool is_relro,
- bool is_last_relro, bool is_first_non_relro);
+ elfcpp::Elf_Xword flags, Output_section_order order,
+ bool is_relro);
// Attach a section to a segment.
void
attach_section_to_segment(Output_section*);
+ // Get section order.
+ Output_section_order
+ default_section_order(Output_section*, bool is_relro_local);
+
// Attach an allocated section to a segment.
void
attach_allocated_section_to_segment(Output_section*);