From cade3c669933278d78d5a8900458324aadd68b14 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sat, 20 Dec 2014 05:45:51 -0800
Subject: [PATCH] Treat .eh_frame section before crtbeginT as normal input
Force the exception frame section from input files before the crtbeginT
file to be handled as an ordinary input section if we aren't creating
the exception frame header. If we don't do this, we won't correctly
handle the special marker symbol in the exception frame section in the
crtbeginT file.
PR gold/14675
* ehframe.cc (Eh_frame::add_ehframe_input_section): Force the
exception frame section from input files if it can't be
optimized.
(Eh_frame::add_ehframe_input_section<32, false>): Updated.
(Eh_frame::add_ehframe_input_section<32, true>): Likewise.
(Eh_frame::add_ehframe_input_section<64, false>): Likewise.
(Eh_frame::add_ehframe_input_section<64, true>): Likewise.
* ehframe.h (Eh_frame::add_ehframe_input_section): Add a
bool parameter to indicate if the exception frame section
can be optimized.
* layout.cc (Layout::Layout): Initialize optimize_ehframe_ to
!has_crtbeginT.
(Layout::layout_eh_frame): Pass this->optimize_ehframe_ to
Eh_frame::add_ehframe_input_section.
(Layout::make_eh_frame_section): Set this->optimize_ehframe_
to true when processing the crtbeginT file if it is on command
line.
(Layout::match_file_name (const char*, const char*)): New.
(Layout::match_file_name(const Relobj*, const char*): Use it.
* layout.h (Layout::Layout): Add has_crtbeginT.
(Layout::match_file_name (const char*, const char*)): New.
(Layout): Add an optimize_ehframe_ member.
* main.cc (main): Update layout.
* options.cc: Include "layout.h".
(Input_arguments::add_file): Set this->has_crtbeginT_ to true
if there is a crtbeginT file.
* options.h (Input_arguments::Input_arguments): Initialize
has_crtbeginT_ to false.
(Input_arguments::has_crtbeginT): New function.
(Input_arguments::has_crtbeginT_): New bool member.
(Command_line::crtbeginT): New function.
---
gold/ChangeLog | 35 +++++++++++++++++++++++++++++++++++
gold/ehframe.cc | 31 +++++++++++++++++++++----------
gold/ehframe.h | 6 ++++--
gold/layout.cc | 37 +++++++++++++++++++++++++++++--------
gold/layout.h | 10 +++++++++-
gold/main.cc | 3 ++-
gold/options.cc | 4 ++++
gold/options.h | 15 ++++++++++++++-
8 files changed, 118 insertions(+), 23 deletions(-)
@@ -1,3 +1,38 @@
+2014-12-22 H.J. Lu <hongjiu.lu@intel.com>
+
+ PR gold/14675
+ * ehframe.cc (Eh_frame::add_ehframe_input_section): Force the
+ exception frame section from input files if it can't be
+ optimized.
+ (Eh_frame::add_ehframe_input_section<32, false>): Updated.
+ (Eh_frame::add_ehframe_input_section<32, true>): Likewise.
+ (Eh_frame::add_ehframe_input_section<64, false>): Likewise.
+ (Eh_frame::add_ehframe_input_section<64, true>): Likewise.
+ * ehframe.h (Eh_frame::add_ehframe_input_section): Add a
+ bool parameter to indicate if the exception frame section
+ can be optimized.
+ * layout.cc (Layout::Layout): Initialize optimize_ehframe_ to
+ !has_crtbeginT.
+ (Layout::layout_eh_frame): Pass this->optimize_ehframe_ to
+ Eh_frame::add_ehframe_input_section.
+ (Layout::make_eh_frame_section): Set this->optimize_ehframe_
+ to true when processing the crtbeginT file if it is on command
+ line.
+ (Layout::match_file_name (const char*, const char*)): New.
+ (Layout::match_file_name(const Relobj*, const char*): Use it.
+ * layout.h (Layout::Layout): Add has_crtbeginT.
+ (Layout::match_file_name (const char*, const char*)): New.
+ (Layout): Add an optimize_ehframe_ member.
+ * main.cc (main): Update layout.
+ * options.cc: Include "layout.h".
+ (Input_arguments::add_file): Set this->has_crtbeginT_ to true
+ if there is a crtbeginT file.
+ * options.h (Input_arguments::Input_arguments): Initialize
+ has_crtbeginT_ to false.
+ (Input_arguments::has_crtbeginT): New function.
+ (Input_arguments::has_crtbeginT_): New bool member.
+ (Command_line::crtbeginT): New function.
+
2014-12-22 Cary Coutant <ccoutant@google.com>
* powerpc.cc (Target_powerpc::relocate): Fix overflow check.
@@ -576,7 +576,8 @@ Eh_frame::add_ehframe_input_section(
section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
- unsigned int reloc_type)
+ unsigned int reloc_type,
+ bool optimize_ehframe)
{
// Get the section contents.
section_size_type contents_len;
@@ -595,15 +596,21 @@ Eh_frame::add_ehframe_input_section(
return false;
New_cies new_cies;
- if (!this->do_add_ehframe_input_section(object, symbols, symbols_size,
+ bool recognized_eh_frame_section
+ = this->do_add_ehframe_input_section(object, symbols, symbols_size,
symbol_names, symbol_names_size,
shndx, reloc_shndx,
reloc_type, pcontents,
- contents_len, &new_cies))
+ contents_len, &new_cies);
+ if (!recognized_eh_frame_section && this->eh_frame_hdr_ != NULL)
+ this->eh_frame_hdr_->found_unrecognized_eh_frame_section();
+
+ // If we don't unrecognize the exception frame section or it can't
+ // be optimized, then return false to force it to be handled as an
+ // ordinary input section.
+ if (!recognized_eh_frame_section
+ || (this->eh_frame_hdr_ == NULL && !optimize_ehframe))
{
- if (this->eh_frame_hdr_ != NULL)
- this->eh_frame_hdr_->found_unrecognized_eh_frame_section();
-
for (New_cies::iterator p = new_cies.begin();
p != new_cies.end();
++p)
@@ -1224,7 +1231,8 @@ Eh_frame::add_ehframe_input_section<32, false>(
section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
- unsigned int reloc_type);
+ unsigned int reloc_type,
+ bool optimize_ehframe);
#endif
#ifdef HAVE_TARGET_32_BIG
@@ -1238,7 +1246,8 @@ Eh_frame::add_ehframe_input_section<32, true>(
section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
- unsigned int reloc_type);
+ unsigned int reloc_type,
+ bool optimize_ehframe);
#endif
#ifdef HAVE_TARGET_64_LITTLE
@@ -1252,7 +1261,8 @@ Eh_frame::add_ehframe_input_section<64, false>(
section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
- unsigned int reloc_type);
+ unsigned int reloc_type,
+ bool optimize_ehframe);
#endif
#ifdef HAVE_TARGET_64_BIG
@@ -1266,7 +1276,8 @@ Eh_frame::add_ehframe_input_section<64, true>(
section_size_type symbol_names_size,
unsigned int shndx,
unsigned int reloc_shndx,
- unsigned int reloc_type);
+ unsigned int reloc_type,
+ bool optimize_ehframe);
#endif
} // End namespace gold.
@@ -371,7 +371,8 @@ class Eh_frame : public Output_section_data
// is the relocation section if any (0 for none, -1U for multiple).
// RELOC_TYPE is the type of the relocation section if any. This
// returns whether the section was incorporated into the .eh_frame
- // data.
+ // data. OPTIMIZE_EHFRAME is true if the exception frame section
+ // can be optimized.
template<int size, bool big_endian>
bool
add_ehframe_input_section(Sized_relobj_file<size, big_endian>* object,
@@ -380,7 +381,8 @@ class Eh_frame : public Output_section_data
const unsigned char* symbol_names,
section_size_type symbol_names_size,
unsigned int shndx, unsigned int reloc_shndx,
- unsigned int reloc_type);
+ unsigned int reloc_type,
+ bool optimize_ehframe);
// Add a CIE and an FDE for a PLT section, to permit unwinding
// through a PLT. The FDE data should start with 8 bytes of zero,
@@ -418,7 +418,8 @@ Layout_task_runner::run(Workqueue* workqueue, const Task* task)
// Layout methods.
-Layout::Layout(int number_of_input_files, Script_options* script_options)
+Layout::Layout(int number_of_input_files, Script_options* script_options,
+ bool has_crtbeginT)
: number_of_input_files_(number_of_input_files),
script_options_(script_options),
namepool_(),
@@ -469,6 +470,7 @@ Layout::Layout(int number_of_input_files, Script_options* script_options)
unique_segment_for_sections_specified_(false),
incremental_inputs_(NULL),
record_output_section_data_from_script_(false),
+ optimize_ehframe_(!has_crtbeginT),
script_output_section_data_list_(),
segment_states_(NULL),
relaxation_debug_check_(NULL),
@@ -1428,7 +1430,8 @@ Layout::layout_eh_frame(Sized_relobj_file<size, big_endian>* object,
symbol_names_size,
shndx,
reloc_shndx,
- reloc_type))
+ reloc_type,
+ this->optimize_ehframe_))
{
os->update_flags_for_input_section(shdr.get_sh_flags());
@@ -1485,6 +1488,14 @@ Layout::make_eh_frame_section(const Relobj* object)
if (os == NULL)
return NULL;
+ // optimize_ehframe_ is false only if there is a crtbeginT file on
+ // command line. We can't optimize the exception frame section
+ // until we have seen the crtbeginT file.
+ if (!this->optimize_ehframe_
+ && object != NULL
+ && Layout::match_file_name(object, "crtbeginT"))
+ this->optimize_ehframe_ = true;
+
if (this->eh_frame_section_ == NULL)
{
this->eh_frame_section_ = os;
@@ -5092,19 +5103,18 @@ Layout::output_section_name(const Relobj* relobj, const char* name,
return name;
}
-// Return true if RELOBJ is an input file whose base name matches
-// FILE_NAME. The base name must have an extension of ".o", and must
-// be exactly FILE_NAME.o or FILE_NAME, one character, ".o". This is
+// Return true if FILE is an input file whose base name matches
+// MATCH. The base name must have an extension of ".o", and must
+// be exactly MATCH.o or MATCH, one character, ".o". This is
// to match crtbegin.o as well as crtbeginS.o without getting confused
// by other possibilities. Overall matching the file name this way is
// a dreadful hack, but the GNU linker does it in order to better
// support gcc, and we need to be compatible.
bool
-Layout::match_file_name(const Relobj* relobj, const char* match)
+Layout::match_file_name(const char* file, const char* match)
{
- const std::string& file_name(relobj->name());
- const char* base_name = lbasename(file_name.c_str());
+ const char* base_name = lbasename(file);
size_t match_len = strlen(match);
if (strncmp(base_name, match, match_len) != 0)
return false;
@@ -5114,6 +5124,17 @@ Layout::match_file_name(const Relobj* relobj, const char* match)
return memcmp(base_name + base_len - 2, ".o", 2) == 0;
}
+// Return true if FILE is an input file whose base name matches
+// MATCH. The base name must have an extension of ".o", and must
+// be exactly MATCH.o or MATCH, one character, ".o".
+
+bool
+Layout::match_file_name(const Relobj* relobj, const char* match)
+{
+ const std::string& file_name(relobj->name());
+ return Layout::match_file_name(file_name.c_str(), match);
+}
+
// Check if a comdat group or .gnu.linkonce section with the given
// NAME is selected for the link. If there is already a section,
// *KEPT_SECTION is set to point to the existing section and the
@@ -488,7 +488,7 @@ enum Output_section_order
class Layout
{
public:
- Layout(int number_of_input_files, Script_options*);
+ Layout(int number_of_input_files, Script_options*, bool has_crtbeginT);
~Layout()
{
@@ -757,6 +757,12 @@ class Layout
|| strncmp(name, ".stab", sizeof(".stab") - 1) == 0);
}
+ // Return true if FILE is an input file whose base name matches
+ // FILE_NAME. The base name must have an extension of ".o", and
+ // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o".
+ static bool
+ match_file_name(const char* file, const char* file_name);
+
// Return true if RELOBJ is an input file whose base name matches
// FILE_NAME. The base name must have an extension of ".o", and
// must be exactly FILE_NAME.o or FILE_NAME, one character, ".o".
@@ -1420,6 +1426,8 @@ class Layout
Incremental_inputs* incremental_inputs_;
// Whether we record output section data created in script
bool record_output_section_data_from_script_;
+ // Whether to optimize the exception frame section.
+ bool optimize_ehframe_;
// List of output data that needs to be removed at relaxation clean up.
Output_section_data_list script_output_section_data_list_;
// Structure to save segment states before entering the relaxation loop.
@@ -227,7 +227,8 @@ main(int argc, char** argv)
// The layout object.
Layout layout(command_line.number_of_input_files(),
- &command_line.script_options());
+ &command_line.script_options(),
+ command_line.crtbeginT());
if (layout.incremental_inputs() != NULL)
layout.incremental_inputs()->report_command_line(argc, argv);
@@ -38,6 +38,7 @@
#include "script.h"
#include "target-select.h"
#include "options.h"
+#include "layout.h"
#include "plugin.h"
namespace gold
@@ -1346,6 +1347,9 @@ Input_arguments::add_file(Input_file_argument& file)
return this->input_argument_list_.back().lib()->add_file(file);
}
this->input_argument_list_.push_back(Input_argument(file));
+ if (!this->has_crtbeginT_
+ && Layout::match_file_name(file.name(), "crtbeginT"))
+ this->has_crtbeginT_ = true;
return this->input_argument_list_.back();
}
@@ -1970,7 +1970,8 @@ class Input_arguments
typedef Input_argument_list::const_iterator const_iterator;
Input_arguments()
- : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0)
+ : input_argument_list_(), in_group_(false), in_lib_(false),
+ file_count_(0), has_crtbeginT_(false)
{ }
// Add a file.
@@ -2030,11 +2031,18 @@ class Input_arguments
number_of_input_files() const
{ return this->file_count_; }
+ // Return whether there is a crtbeginT file.
+ bool
+ has_crtbeginT() const
+ { return this->has_crtbeginT_; }
+
private:
Input_argument_list input_argument_list_;
bool in_group_;
bool in_lib_;
unsigned int file_count_;
+ // Whether there is a crtbeginT file.
+ bool has_crtbeginT_;
};
@@ -2103,6 +2111,11 @@ class Command_line
end() const
{ return this->inputs_.end(); }
+ // Whether there is a crtbeginT file.
+ bool
+ crtbeginT() const
+ { return this->inputs_.has_crtbeginT(); }
+
private:
Command_line(const Command_line&);
Command_line& operator=(const Command_line&);
--
1.9.3