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bfd: linker: merge .sframe sections

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The linker merges all the input .sframe sections.  When merging, the
linker verifies that all the input .sframe sections have the same
abi/arch.

The linker uses libsframe library to perform key actions on the
.sframe sections - decode, read, and create output data.  This
implies buildsystem changes to make and install libsframe before
libbfd.

The linker places the output .sframe section in a new segment of its
own: PT_GNU_SFRAME.  A new segment is not added, however, if the
generated .sframe section is empty.

When a section is discarded from the final link, the corresponding
entries in the .sframe section for those functions are also deleted.

The linker sorts the SFrame FDEs on start address by default and sets
the SFRAME_F_FDE_SORTED flag in the .sframe section.

This patch also adds support for generation of SFrame unwind
information for the .plt* sections on x86_64.  SFrame unwind info is
generated for IBT enabled PLT, lazy/non-lazy PLT.

The existing linker option --no-ld-generated-unwind-info has been
adapted to include the control of whether .sframe unwind information
will be generated for the linker generated sections like PLT.

Changes to the linker script have been made as necessary.

ChangeLog:

	* Makefile.def: Add install dependency on libsframe for libbfd.
	* Makefile.in: Regenerated.
	* bfd/Makefile.am: Add elf-sframe.c
	* bfd/Makefile.in: Regenerated.
	* bfd/bfd-in2.h (SEC_INFO_TYPE_SFRAME): Regenerated.
	* bfd/configure: Regenerate.
	* bfd/configure.ac: Add elf-sframe.lo.
	* bfd/elf-bfd.h (struct sframe_func_bfdinfo): New struct.
	(struct sframe_dec_info): Likewise.
	(struct sframe_enc_info): Likewise.
	(struct elf_link_hash_table): New member for encoded .sframe
	object.
	(struct output_elf_obj_tdata): New member.
	(elf_sframe): New access macro.
	(_bfd_elf_set_section_sframe): New declaration.
	* bfd/elf.c (get_segment_type): Handle new segment
	PT_GNU_SFRAME.
	(bfd_section_from_phdr): Likewise.
	(get_program_header_size): Likewise.
	(_bfd_elf_map_sections_to_segments): Likewise.
	* bfd/elf64-x86-64.c (elf_x86_64_link_setup_gnu_properties): Add
	contents to the .sframe sections or .plt* entries.
	* bfd/elflink.c (elf_section_ignore_discarded_relocs): Handle
	SEC_INFO_TYPE_SFRAME.
	(_bfd_elf_default_action_discarded): Handle .sframe section.
	(elf_link_input_bfd): Merge .sframe section.
	(bfd_elf_final_link): Write the output .sframe section.
	(bfd_elf_discard_info): Handle discarding .sframe section.
	* bfd/elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Create
	.sframe section for .plt and .plt.sec.
	(_bfd_x86_elf_finish_dynamic_sections): Handle .sframe from
	.plt* sections.
	* bfd/elfxx-x86.h (PLT_SFRAME_FDE_START_OFFSET): New
	definition.
	(SFRAME_PLT0_MAX_NUM_FRES): Likewise.
	(SFRAME_PLTN_MAX_NUM_FRES): Likewise.
	(struct elf_x86_sframe_plt): New structure.
	(struct elf_x86_link_hash_table): New member.
	(struct elf_x86_init_table): New members for .sframe
	creation.
	* bfd/section.c: Add new definition SEC_INFO_TYPE_SFRAME.
	* binutils/readelf.c (get_segment_type): Handle new segment
	PT_GNU_SFRAME.
	* ld/ld.texi: Update documentation for
	--no-ld-generated-unwind-info.
	* ld/scripttempl/elf.sc: Support .sframe sections.
	* ld/Makefile.am (TESTSFRAMELIB): Use it.
	(check-DEJAGNU): Likewise.
	* ld/Makefile.in: Regenerated.
	* ld/configure.ac (TESTSFRAMELIB): Set to the .so or .a like TESTBFDLIB.
	* ld/configure: Regenerated.
	* bfd/elf-sframe.c: New file.

include/ChangeLog:

	* elf/common.h (PT_GNU_SFRAME): New definition.
	* elf/internal.h (struct elf_segment_map): Handle new segment
	type PT_GNU_SFRAME.

ld/testsuite/ChangeLog:

	* ld/testsuite/ld-bootstrap/bootstrap.exp: Add SFRAMELIB.
	* ld/testsuite/ld-aarch64/aarch64-elf.exp: Add new test
	  sframe-simple-1.
	* ld/testsuite/ld-aarch64/sframe-bar.s: New file.
	* ld/testsuite/ld-aarch64/sframe-foo.s: Likewise.
	* ld/testsuite/ld-aarch64/sframe-simple-1.d: Likewise.
	* ld/testsuite/ld-sframe/sframe-empty.d: New test.
	* ld/testsuite/ld-sframe/sframe-empty.s: New file.
	* ld/testsuite/ld-sframe/sframe.exp: New testsuite.
	* ld/testsuite/ld-x86-64/sframe-bar.s: New file.
	* ld/testsuite/ld-x86-64/sframe-foo.s: Likewise.
	* ld/testsuite/ld-x86-64/sframe-simple-1.d: Likewise.
	* ld/testsuite/ld-x86-64/sframe-plt-1.d: Likewise.
	* ld/testsuite/ld-x86-64/sframe-simple-1.d: Likewise.
	* ld/testsuite/ld-x86-64/x86-64.exp: Add new tests -
	  sframe-simple-1, sframe-plt-1.
	* ld/testsuite/lib/ld-lib.exp: Add new proc to check if
	  assembler supports SFrame section.
	* ld/testsuite/ld-sframe/discard.d: New file.
	* ld/testsuite/ld-sframe/discard.ld: Likewise.
	* ld/testsuite/ld-sframe/discard.s: Likewise.
This commit is contained in:
Indu Bhagat 2022-11-15 15:07:04 -08:00
parent 19e559f1c9
commit cf0e0a0ba9
43 changed files with 1595 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Makefile.def
View File

@ -458,11 +458,14 @@ dependencies = { module=all-gdbsupport; on=all-gnulib; };
dependencies = { module=all-gdbsupport; on=all-intl; };
// Host modules specific to binutils.
// build libsframe before bfd for encoder/decoder support for linking
// SFrame sections
dependencies = { module=configure-bfd; on=configure-libiberty; hard=true; };
dependencies = { module=configure-bfd; on=configure-intl; };
dependencies = { module=all-bfd; on=all-libiberty; };
dependencies = { module=all-bfd; on=all-intl; };
dependencies = { module=all-bfd; on=all-zlib; };
dependencies = { module=all-bfd; on=all-libsframe; };
dependencies = { module=configure-opcodes; on=configure-libiberty; hard=true; };
dependencies = { module=all-opcodes; on=all-libiberty; };
@ -488,6 +491,7 @@ dependencies = { module=install-binutils; on=install-opcodes; };
dependencies = { module=install-strip-binutils; on=install-strip-opcodes; };
// Likewise for ld, libctf, and bfd.
dependencies = { module=install-bfd; on=install-libsframe; };
dependencies = { module=install-libctf; on=install-bfd; };
dependencies = { module=install-ld; on=install-bfd; };
dependencies = { module=install-ld; on=install-libctf; };

11
Makefile.in
View File

@ -64407,6 +64407,16 @@ all-stagetrain-bfd: maybe-all-stagetrain-zlib
all-stagefeedback-bfd: maybe-all-stagefeedback-zlib
all-stageautoprofile-bfd: maybe-all-stageautoprofile-zlib
all-stageautofeedback-bfd: maybe-all-stageautofeedback-zlib
all-bfd: maybe-all-libsframe
all-stage1-bfd: maybe-all-stage1-libsframe
all-stage2-bfd: maybe-all-stage2-libsframe
all-stage3-bfd: maybe-all-stage3-libsframe
all-stage4-bfd: maybe-all-stage4-libsframe
all-stageprofile-bfd: maybe-all-stageprofile-libsframe
all-stagetrain-bfd: maybe-all-stagetrain-libsframe
all-stagefeedback-bfd: maybe-all-stagefeedback-libsframe
all-stageautoprofile-bfd: maybe-all-stageautoprofile-libsframe
all-stageautofeedback-bfd: maybe-all-stageautofeedback-libsframe
configure-opcodes: configure-libiberty
configure-stage1-opcodes: configure-stage1-libiberty
configure-stage2-opcodes: configure-stage2-libiberty
@ -64539,6 +64549,7 @@ all-stageautoprofile-binutils: maybe-all-stageautoprofile-libsframe
all-stageautofeedback-binutils: maybe-all-stageautofeedback-libsframe
install-binutils: maybe-install-opcodes
install-strip-binutils: maybe-install-strip-opcodes
install-bfd: maybe-install-libsframe
install-libctf: maybe-install-bfd
install-ld: maybe-install-bfd
install-ld: maybe-install-libctf

6
bfd/Makefile.am
View File

@ -286,6 +286,7 @@ BFD32_BACKENDS = \
ecofflink.lo \
elf-attrs.lo \
elf-eh-frame.lo \
elf-sframe.lo \
elf-ifunc.lo \
elf-m10200.lo \
elf-m10300.lo \
@ -419,6 +420,7 @@ BFD32_BACKENDS_CFILES = \
ecofflink.c \
elf-attrs.c \
elf-eh-frame.c \
elf-sframe.c \
elf-ifunc.c \
elf-m10200.c \
elf-m10300.c \
@ -777,8 +779,8 @@ ofiles: stamp-ofiles ; @true
# dependency tracking fragments are picked up in the Makefile.
libbfd_la_SOURCES = $(BFD32_LIBS_CFILES)
EXTRA_libbfd_la_SOURCES = $(CFILES)
libbfd_la_DEPENDENCIES = $(OFILES) ofiles
libbfd_la_LIBADD = `cat ofiles` @SHARED_LIBADD@ $(LIBDL) $(ZLIB) $(ZSTD_LIBS)
libbfd_la_DEPENDENCIES = $(OFILES) ofiles ../libsframe/libsframe.la
libbfd_la_LIBADD = `cat ofiles` @SHARED_LIBADD@ $(LIBDL) $(ZLIB) $(ZSTD_LIBS) ../libsframe/libsframe.la
libbfd_la_LDFLAGS += -release `cat libtool-soversion` @SHARED_LDFLAGS@
# libtool will build .libs/libbfd.a. We create libbfd.a in the build

7
bfd/Makefile.in
View File

@ -755,6 +755,7 @@ BFD32_BACKENDS = \
ecofflink.lo \
elf-attrs.lo \
elf-eh-frame.lo \
elf-sframe.lo \
elf-ifunc.lo \
elf-m10200.lo \
elf-m10300.lo \
@ -888,6 +889,7 @@ BFD32_BACKENDS_CFILES = \
ecofflink.c \
elf-attrs.c \
elf-eh-frame.c \
elf-sframe.c \
elf-ifunc.c \
elf-m10200.c \
elf-m10300.c \
@ -1207,8 +1209,8 @@ OFILES = $(BFD_BACKENDS) $(BFD_MACHINES) @COREFILE@ @bfd64_libs@
# dependency tracking fragments are picked up in the Makefile.
libbfd_la_SOURCES = $(BFD32_LIBS_CFILES)
EXTRA_libbfd_la_SOURCES = $(CFILES)
libbfd_la_DEPENDENCIES = $(OFILES) ofiles
libbfd_la_LIBADD = `cat ofiles` @SHARED_LIBADD@ $(LIBDL) $(ZLIB) $(ZSTD_LIBS)
libbfd_la_DEPENDENCIES = $(OFILES) ofiles ../libsframe/libsframe.la
libbfd_la_LIBADD = `cat ofiles` @SHARED_LIBADD@ $(LIBDL) $(ZLIB) $(ZSTD_LIBS) ../libsframe/libsframe.la
# libtool will build .libs/libbfd.a. We create libbfd.a in the build
# directory so that we don't have to convert all the programs that use
@ -1574,6 +1576,7 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-m10300.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-nacl.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-properties.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-sframe.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-strtab.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf-vxworks.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf.Plo@am__quote@

1
bfd/bfd-in2.h
View File

@ -994,6 +994,7 @@ typedef struct bfd_section
#define SEC_INFO_TYPE_JUST_SYMS 4
#define SEC_INFO_TYPE_TARGET 5
#define SEC_INFO_TYPE_EH_FRAME_ENTRY 6
#define SEC_INFO_TYPE_SFRAME 7
/* Nonzero if this section uses RELA relocations, rather than REL. */
unsigned int use_rela_p:1;

2
bfd/configure vendored
View File

@ -13582,7 +13582,7 @@ selarchs="$f"
tb=
elf="elf.lo elflink.lo elf-attrs.lo elf-strtab.lo elf-eh-frame.lo
dwarf1.lo dwarf2.lo"
elf-sframe.lo dwarf1.lo dwarf2.lo"
coffgen="coffgen.lo dwarf2.lo"
coff="cofflink.lo $coffgen"
ecoff="ecofflink.lo $coffgen"

2
bfd/configure.ac
View File

@ -383,7 +383,7 @@ selarchs="$f"
tb=
elf="elf.lo elflink.lo elf-attrs.lo elf-strtab.lo elf-eh-frame.lo
dwarf1.lo dwarf2.lo"
elf-sframe.lo dwarf1.lo dwarf2.lo"
coffgen="coffgen.lo dwarf2.lo"
coff="cofflink.lo $coffgen"
ecoff="ecofflink.lo $coffgen"

54
bfd/elf-bfd.h
View File

@ -490,6 +490,40 @@ struct eh_frame_hdr_info
u;
};
/* Additional information for each function (used at link time). */
struct sframe_func_bfdinfo
{
/* Whether the function has been discarded from the final output. */
bool func_deleted_p;
/* Relocation offset. */
unsigned int func_r_offset;
/* Relocation index. */
unsigned int func_reloc_index;
};
/* SFrame decoder info.
Contains all information for a decoded .sframe section. */
struct sframe_dec_info
{
/* Decoder context. */
struct sframe_decoder_ctx *sfd_ctx;
/* Number of function descriptor entries in this .sframe. */
unsigned int sfd_fde_count;
/* Additional information for linking. */
struct sframe_func_bfdinfo *sfd_func_bfdinfo;
};
/* SFrame encoder info.
Contains all information for an encoded .sframe section to be
written out. */
struct sframe_enc_info
{
/* Encoder context. */
struct sframe_encoder_ctx *sfe_ctx;
/* Output section. */
asection *sframe_section;
};
/* Enum used to identify target specific extensions to the elf_obj_tdata
and elf_link_hash_table structures. Note the enums deliberately start
from 1 so that we can detect an uninitialized field. The generic value
@ -668,6 +702,9 @@ struct elf_link_hash_table
/* Used by eh_frame code when editing .eh_frame. */
struct eh_frame_hdr_info eh_info;
/* Used to link unwind data in .sframe sections. */
struct sframe_enc_info sfe_info;
/* A linked list of local symbols to be added to .dynsym. */
struct elf_link_local_dynamic_entry *dynlocal;
@ -1944,6 +1981,10 @@ struct output_elf_obj_tdata
/* Segment flags for the PT_GNU_STACK segment. */
unsigned int stack_flags;
/* Used to determine if PT_GNU_SFRAME segment header should be
created. */
asection *sframe;
/* Used to determine if the e_flags field has been initialized */
bool flags_init;
};
@ -2125,6 +2166,7 @@ struct elf_obj_tdata
#define elf_link_info(bfd) (elf_tdata(bfd) -> o->link_info)
#define elf_next_file_pos(bfd) (elf_tdata(bfd) -> o->next_file_pos)
#define elf_stack_flags(bfd) (elf_tdata(bfd) -> o->stack_flags)
#define elf_sframe(bfd) (elf_tdata(bfd) -> o->sframe)
#define elf_shstrtab(bfd) (elf_tdata(bfd) -> o->strtab_ptr)
#define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section)
#define elf_symtab_shndx_list(bfd) (elf_tdata(bfd) -> symtab_shndx_list)
@ -2439,6 +2481,18 @@ extern bool _bfd_elf_eh_frame_entry_present
extern bool _bfd_elf_maybe_strip_eh_frame_hdr
(struct bfd_link_info *);
extern bool _bfd_elf_sframe_present
(struct bfd_link_info *);
extern bool _bfd_elf_parse_sframe
(bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
extern bool _bfd_elf_discard_section_sframe
(asection *, bool (*) (bfd_vma, void *), struct elf_reloc_cookie *);
extern bool _bfd_elf_merge_section_sframe
(bfd *, struct bfd_link_info *, asection *, bfd_byte *);
extern bool _bfd_elf_write_section_sframe
(bfd *, struct bfd_link_info *);
extern bool _bfd_elf_set_section_sframe (bfd *, struct bfd_link_info *);
extern bool _bfd_elf_hash_symbol (struct elf_link_hash_entry *);
extern long _bfd_elf_link_lookup_local_dynindx

544
bfd/elf-sframe.c Normal file
View File

@ -0,0 +1,544 @@
/* .sframe section processing.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "sframe-api.h"
/* Return TRUE if the function has been marked for deletion during the linking
process. */
static bool
sframe_decoder_func_deleted_p (struct sframe_dec_info *sfd_info,
unsigned int func_idx)
{
if (func_idx < sfd_info->sfd_fde_count)
return sfd_info->sfd_func_bfdinfo[func_idx].func_deleted_p;
return false;
}
/* Mark the function in the decoder info for deletion. */
static void
sframe_decoder_mark_func_deleted (struct sframe_dec_info *sfd_info,
unsigned int func_idx)
{
if (func_idx < sfd_info->sfd_fde_count)
sfd_info->sfd_func_bfdinfo[func_idx].func_deleted_p = true;
}
/* Get the relocation offset from the decoder info for the given function. */
static unsigned int
sframe_decoder_get_func_r_offset (struct sframe_dec_info *sfd_info,
unsigned int func_idx)
{
BFD_ASSERT (func_idx < sfd_info->sfd_fde_count);
unsigned int func_r_offset
= sfd_info->sfd_func_bfdinfo[func_idx].func_r_offset;
/* There must have been a reloc. */
BFD_ASSERT (func_r_offset);
return func_r_offset;
}
/* Bookkeep the function relocation offset in the decoder info. */
static void
sframe_decoder_set_func_r_offset (struct sframe_dec_info *sfd_info,
unsigned int func_idx,
unsigned int r_offset)
{
if (func_idx < sfd_info->sfd_fde_count)
sfd_info->sfd_func_bfdinfo[func_idx].func_r_offset = r_offset;
}
/* Get the relocation index in the elf_reloc_cookie for the function. */
static unsigned int
sframe_decoder_get_func_reloc_index (struct sframe_dec_info *sfd_info,
unsigned int func_idx)
{
BFD_ASSERT (func_idx < sfd_info->sfd_fde_count);
return sfd_info->sfd_func_bfdinfo[func_idx].func_reloc_index;
}
/* Bookkeep the relocation index in the elf_reloc_cookie for the function. */
static void
sframe_decoder_set_func_reloc_index (struct sframe_dec_info *sfd_info,
unsigned int func_idx,
unsigned int reloc_index)
{
if (func_idx < sfd_info->sfd_fde_count)
sfd_info->sfd_func_bfdinfo[func_idx].func_reloc_index = reloc_index;
}
/* Initialize the set of additional information in CFD_INFO,
needed for linking SEC. Returns TRUE if setup is done successfully. */
static bool
sframe_decoder_init_func_bfdinfo (asection *sec,
struct sframe_dec_info *sfd_info,
struct elf_reloc_cookie *cookie)
{
unsigned int fde_count;
unsigned int func_bfdinfo_size, i;
fde_count = sframe_decoder_get_num_fidx (sfd_info->sfd_ctx);
sfd_info->sfd_fde_count = fde_count;
/* Allocate and clear the memory. */
func_bfdinfo_size = (sizeof (struct sframe_func_bfdinfo)) * fde_count;
sfd_info->sfd_func_bfdinfo
= (struct sframe_func_bfdinfo*) bfd_malloc (func_bfdinfo_size);
if (sfd_info->sfd_func_bfdinfo == NULL)
return false;
memset (sfd_info->sfd_func_bfdinfo, 0, func_bfdinfo_size);
/* For linker generated .sframe sections, we have no relocs. Skip. */
if ((sec->flags & SEC_LINKER_CREATED) && cookie->rels == NULL)
return true;
for (i = 0; i < fde_count; i++)
{
cookie->rel = cookie->rels + i;
BFD_ASSERT (cookie->rel < cookie->relend);
/* Bookkeep the relocation offset and relocation index of each function
for later use. */
sframe_decoder_set_func_r_offset (sfd_info, i, cookie->rel->r_offset);
sframe_decoder_set_func_reloc_index (sfd_info, i,
(cookie->rel - cookie->rels));
cookie->rel++;
}
BFD_ASSERT (cookie->rel == cookie->relend);
return true;
}
/* Read the value from CONTENTS at the specified OFFSET for the given ABFD. */
static bfd_vma
sframe_read_value (bfd *abfd, bfd_byte *contents, unsigned int offset,
unsigned int width)
{
BFD_ASSERT (contents && offset);
/* Supporting the usecase of reading only the 4-byte relocated
value (signed offset for func start addr) for now. */
BFD_ASSERT (width == 4);
/* FIXME endianness ?? */
unsigned char *buf = contents + offset;
bfd_vma value = bfd_get_signed_32 (abfd, buf);
return value;
}
/* Return true if there is at least one non-empty .sframe section in
input files. Can only be called after ld has mapped input to
output sections, and before sections are stripped. */
bool
_bfd_elf_sframe_present (struct bfd_link_info *info)
{
asection *sframe = bfd_get_section_by_name (info->output_bfd, ".sframe");
if (sframe == NULL)
return false;
/* Count only sections which have at least a single FDE. */
for (sframe = sframe->map_head.s; sframe != NULL; sframe = sframe->map_head.s)
/* Note that this may become an approximate check in the future when
some ABI/arch begin to use the sfh_auxhdr_len. When sfh_auxhdr_len has
non-zero value, it will need to be accounted for in the calculation of
the SFrame header size. */
if (sframe->size > sizeof (sframe_header))
return true;
return false;
}
/* Try to parse .sframe section SEC, which belongs to ABFD. Store the
information in the section's sec_info field on success. COOKIE
describes the relocations in SEC.
Returns TRUE if success, FALSE if any error or failure. */
bool
_bfd_elf_parse_sframe (bfd *abfd,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sec, struct elf_reloc_cookie *cookie)
{
bfd_byte *sfbuf = NULL;
struct sframe_dec_info *sfd_info;
sframe_decoder_ctx *sfd_ctx;
bfd_size_type sf_size;
int decerr = 0;
if (sec->size == 0
|| sec->sec_info_type != SEC_INFO_TYPE_NONE)
{
/* This file does not contain .sframe information. */
return false;
}
if (bfd_is_abs_section (sec->output_section))
{
/* At least one of the sections is being discarded from the
link, so we should just ignore them. */
return false;
}
/* Read the SFrame unwind information from abfd. */
if (!bfd_malloc_and_get_section (abfd, sec, &sfbuf))
goto fail_no_free;
/* Decode the buffer and keep decoded contents for later use.
Relocations are performed later, but are such that the section's
size is unaffected. */
sfd_info = bfd_malloc (sizeof (struct sframe_dec_info));
sf_size = sec->size;
sfd_info->sfd_ctx = sframe_decode ((const char*)sfbuf, sf_size, &decerr);
sfd_ctx = sfd_info->sfd_ctx;
if (!sfd_ctx)
/* Free'ing up any memory held by decoder context is done by
sframe_decode in case of error. */
goto fail_no_free;
if (!sframe_decoder_init_func_bfdinfo (sec, sfd_info, cookie))
{
sframe_decoder_free (&sfd_ctx);
goto fail_no_free;
}
elf_section_data (sec)->sec_info = sfd_info;
sec->sec_info_type = SEC_INFO_TYPE_SFRAME;
goto success;
fail_no_free:
_bfd_error_handler
(_("error in %pB(%pA); no .sframe will be created"),
abfd, sec);
return false;
success:
free (sfbuf);
return true;
}
/* This function is called for each input file before the .sframe section
is relocated. It marks the SFrame FDE for the discarded functions for
deletion.
The function returns TRUE iff any entries have been deleted. */
bool
_bfd_elf_discard_section_sframe
(asection *sec,
bool (*reloc_symbol_deleted_p) (bfd_vma, void *),
struct elf_reloc_cookie *cookie)
{
bool changed;
bool keep;
unsigned int i;
unsigned int func_desc_offset;
unsigned int num_fidx;
struct sframe_dec_info *sfd_info;
changed = false;
/* FIXME - if relocatable link and changed = true, how does the final
.rela.sframe get updated ?. */
keep = false;
sfd_info = (struct sframe_dec_info *) elf_section_data (sec)->sec_info;
/* Skip checking for the linker created .sframe sections
(for PLT sections). */
if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL)
{
num_fidx = sframe_decoder_get_num_fidx (sfd_info->sfd_ctx);
for (i = 0; i < num_fidx; i++)
{
func_desc_offset = sframe_decoder_get_func_r_offset (sfd_info, i);
cookie->rel = cookie->rels
+ sframe_decoder_get_func_reloc_index (sfd_info, i);
keep = !(*reloc_symbol_deleted_p) (func_desc_offset, cookie);
if (!keep)
{
sframe_decoder_mark_func_deleted (sfd_info, i);
changed = true;
}
}
}
return changed;
}
/* Update the reference to the output .sframe section in the output ELF
BFD ABFD. Returns true if no error. */
bool
_bfd_elf_set_section_sframe (bfd *abfd,
struct bfd_link_info *info)
{
asection *cfsec;
cfsec = bfd_get_section_by_name (info->output_bfd, ".sframe");
if (!cfsec)
return false;
elf_sframe (abfd) = cfsec;
return true;
}
/* Merge .sframe section SEC. This is called with the relocated
CONTENTS. */
bool
_bfd_elf_merge_section_sframe (bfd *abfd,
struct bfd_link_info *info,
asection *sec,
bfd_byte *contents)
{
struct sframe_dec_info *sfd_info;
struct sframe_enc_info *sfe_info;
sframe_decoder_ctx *sfd_ctx;
sframe_encoder_ctx *sfe_ctx;
unsigned char sfd_ctx_abi_arch;
int8_t sfd_ctx_fixed_fp_offset;
int8_t sfd_ctx_fixed_ra_offset;
int encerr = 0;
struct elf_link_hash_table *htab;
asection *cfsec;
/* Sanity check - handle SFrame sections only. */
if (sec->sec_info_type != SEC_INFO_TYPE_SFRAME)
return false;
sfd_info = (struct sframe_dec_info *) elf_section_data (sec)->sec_info;
sfd_ctx = sfd_info->sfd_ctx;
htab = elf_hash_table (info);
sfe_info = &(htab->sfe_info);
sfe_ctx = sfe_info->sfe_ctx;
/* All input bfds are expected to have a valid SFrame section. Even if
the SFrame section is empty with only a header, there must be a valid
SFrame decoder context by now. The SFrame encoder context, however,
will get set later here, if this is the first call to the function. */
if (sfd_ctx == NULL || sfe_info == NULL)
return false;
if (htab->sfe_info.sfe_ctx == NULL)
{
sfd_ctx_abi_arch = sframe_decoder_get_abi_arch (sfd_ctx);
sfd_ctx_fixed_fp_offset = sframe_decoder_get_fixed_fp_offset (sfd_ctx);
sfd_ctx_fixed_ra_offset = sframe_decoder_get_fixed_ra_offset (sfd_ctx);
/* Valid values are non-zero. */
if (!sfd_ctx_abi_arch)
return false;
htab->sfe_info.sfe_ctx = sframe_encode (SFRAME_VERSION_1,
0, /* SFrame flags. */
sfd_ctx_abi_arch,
sfd_ctx_fixed_fp_offset,
sfd_ctx_fixed_ra_offset,
&encerr);
/* Handle errors from sframe_encode. */
if (htab->sfe_info.sfe_ctx == NULL)
return false;
}
sfe_ctx = sfe_info->sfe_ctx;
if (sfe_info->sframe_section == NULL)
{
/* Make sure things are set for an eventual write.
Size of the output section is not known until
_bfd_elf_write_section_sframe is ready with the buffer
to write out. */
cfsec = bfd_get_section_by_name (info->output_bfd, ".sframe");
if (cfsec)
{
sfe_info->sframe_section = cfsec;
// elf_sframe (abfd) = cfsec;
}
else
return false;
}
/* Check that all .sframe sections being linked have the same
ABI/arch. */
if (sframe_decoder_get_abi_arch (sfd_ctx)
!= sframe_encoder_get_abi_arch (sfe_ctx))
{
_bfd_error_handler
(_("input SFrame sections with different abi prevent .sframe"
" generation"));
return false;
}
/* Iterate over the function descriptor entries and the FREs of the
function from the decoder context. Add each of them to the encoder
context, if suitable. */
unsigned int i = 0, j = 0, cur_fidx = 0;
unsigned int num_fidx = sframe_decoder_get_num_fidx (sfd_ctx);
unsigned int num_enc_fidx = sframe_encoder_get_num_fidx (sfe_ctx);
for (i = 0; i < num_fidx; i++)
{
unsigned int num_fres = 0;
int32_t func_start_address;
bfd_vma address;
uint32_t func_size = 0;
unsigned char func_info = 0;
unsigned int r_offset = 0;
bool pltn_reloc_by_hand = false;
unsigned int pltn_r_offset = 0;
if (!sframe_decoder_get_funcdesc (sfd_ctx, i, &num_fres, &func_size,
&func_start_address, &func_info))
{
/* If function belongs to a deleted section, skip editing the
function descriptor entry. */
if (sframe_decoder_func_deleted_p(sfd_info, i))
continue;
/* Don't edit function descriptor entries for relocatable link. */
if (!bfd_link_relocatable (info))
{
if (!(sec->flags & SEC_LINKER_CREATED))
{
/* Get relocated contents by reading the value of the
relocated function start address at the beginning of the
function descriptor entry. */
r_offset = sframe_decoder_get_func_r_offset (sfd_info, i);
}
else
{
/* Expected to land here for SFrame unwind info as created
for the .plt* sections. These sections can have upto two
FDE entries. Although the code should work for > 2,
leaving this assert here for safety. */
BFD_ASSERT (num_fidx <= 2);
/* For the first entry, we know the offset of the SFrame FDE's
sfde_func_start_address. Side note: see how the value
of PLT_SFRAME_FDE_START_OFFSET is also set to the
same. */
r_offset = sframe_decoder_get_hdr_size (sfd_ctx);
/* For any further SFrame FDEs, the generator has already put
in an offset in place of sfde_func_start_address of the
corresponding FDE. We will use it by hand to relocate. */
if (i > 0)
{
pltn_r_offset
= r_offset + (i * sizeof (sframe_func_desc_entry));
pltn_reloc_by_hand = true;
}
}
/* Get the SFrame FDE function start address after relocation. */
address = sframe_read_value (abfd, contents, r_offset, 4);
if (pltn_reloc_by_hand)
address += sframe_read_value (abfd, contents,
pltn_r_offset, 4);
address += (sec->output_offset + r_offset);
/* FIXME For testing only. Cleanup later. */
// address += (sec->output_section->vma);
func_start_address = address;
}
/* Update the encoder context with updated content. */
int err = sframe_encoder_add_funcdesc (sfe_ctx, func_start_address,
func_size, func_info,
num_fres);
cur_fidx++;
BFD_ASSERT (!err);
}
for (j = 0; j < num_fres; j++)
{
sframe_frame_row_entry fre;
if (!sframe_decoder_get_fre (sfd_ctx, i, j, &fre))
{
int err = sframe_encoder_add_fre (sfe_ctx,
cur_fidx-1+num_enc_fidx,
&fre);
BFD_ASSERT (!err);
}
}
}
/* Free the SFrame decoder context. */
sframe_decoder_free (&sfd_ctx);
return true;
}
/* Write out the .sframe section. This must be called after
_bfd_elf_merge_section_sframe has been called on all input
.sframe sections. */
bool
_bfd_elf_write_section_sframe (bfd *abfd, struct bfd_link_info *info)
{
bool retval = true;
struct elf_link_hash_table *htab;
struct sframe_enc_info *sfe_info;
sframe_encoder_ctx *sfe_ctx;
asection *sec;
void *contents;
size_t sec_size;
int err = 0;
htab = elf_hash_table (info);
sfe_info = &htab->sfe_info;
sec = sfe_info->sframe_section;
sfe_ctx = sfe_info->sfe_ctx;
if (sec == NULL)
return true;
contents = sframe_encoder_write (sfe_ctx, &sec_size, &err);
sec->size = (bfd_size_type) sec_size;
if (!bfd_set_section_contents (abfd, sec->output_section, contents,
(file_ptr) sec->output_offset,
sec->size))
retval = false;
else if (!bfd_link_relocatable (info))
{
Elf_Internal_Shdr *hdr = &elf_section_data (sec)->this_hdr;
hdr->sh_size = sec->size;
}
/* For relocatable links, do not update the section size as the section
contents have not been relocated. */
sframe_encoder_free (&sfe_ctx);
return retval;
}

32
bfd/elf.c
View File

@ -1673,6 +1673,7 @@ get_segment_type (unsigned int p_type)
case PT_GNU_EH_FRAME: pt = "EH_FRAME"; break;
case PT_GNU_STACK: pt = "STACK"; break;
case PT_GNU_RELRO: pt = "RELRO"; break;
case PT_GNU_SFRAME: pt = "SFRAME"; break;
default: pt = NULL; break;
}
return pt;
@ -3081,6 +3082,10 @@ bfd_section_from_phdr (bfd *abfd, Elf_Internal_Phdr *hdr, int hdr_index)
case PT_GNU_RELRO:
return _bfd_elf_make_section_from_phdr (abfd, hdr, hdr_index, "relro");
case PT_GNU_SFRAME:
return _bfd_elf_make_section_from_phdr (abfd, hdr, hdr_index,
"sframe");
default:
/* Check for any processor-specific program segment types. */
bed = get_elf_backend_data (abfd);
@ -4450,6 +4455,12 @@ get_program_header_size (bfd *abfd, struct bfd_link_info *info)
++segs;
}
if (elf_sframe (abfd))
{
/* We need a PT_GNU_SFRAME segment. */
++segs;
}
s = bfd_get_section_by_name (abfd,
NOTE_GNU_PROPERTY_SECTION_NAME);
if (s != NULL && s->size != 0)
@ -4715,6 +4726,7 @@ _bfd_elf_map_sections_to_segments (bfd *abfd,
asection *first_tls = NULL;
asection *first_mbind = NULL;
asection *dynsec, *eh_frame_hdr;
asection *sframe;
size_t amt;
bfd_vma addr_mask, wrap_to = 0; /* Bytes. */
bfd_size_type phdr_size; /* Octets/bytes. */
@ -5210,6 +5222,26 @@ _bfd_elf_map_sections_to_segments (bfd *abfd,
pm = &m->next;
}
/* If there is a .sframe section, throw in a PT_GNU_SFRAME
segment. */
sframe = elf_sframe (abfd);
if (sframe != NULL
&& (sframe->output_section->flags & SEC_LOAD) != 0
&& sframe->size != 0)
{
amt = sizeof (struct elf_segment_map);
m = (struct elf_segment_map *) bfd_zalloc (abfd, amt);
if (m == NULL)
goto error_return;
m->next = NULL;
m->p_type = PT_GNU_SFRAME;
m->count = 1;
m->sections[0] = sframe->output_section;
*pm = m;
pm = &m->next;
}
if (elf_stack_flags (abfd))
{
amt = sizeof (struct elf_segment_map);

97
bfd/elf64-x86-64.c
View File

@ -22,6 +22,7 @@
#include "elfxx-x86.h"
#include "dwarf2.h"
#include "libiberty.h"
#include "sframe.h"
#include "opcode/i386.h"
@ -818,6 +819,87 @@ static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
};
static const sframe_frame_row_entry elf_x86_64_sframe_null_fre =
{
0,
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* .sframe FRE covering the .plt section entry. */
static const sframe_frame_row_entry elf_x86_64_sframe_plt0_fre1 =
{
0, /* SFrame FRE start address. */
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* .sframe FRE covering the .plt section entry. */
static const sframe_frame_row_entry elf_x86_64_sframe_plt0_fre2 =
{
6, /* SFrame FRE start address. */
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* .sframe FRE covering the .plt section entry. */
static const sframe_frame_row_entry elf_x86_64_sframe_pltn_fre1 =
{
0, /* SFrame FRE start address. */
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* .sframe FRE covering the .plt section entry. */
static const sframe_frame_row_entry elf_x86_64_sframe_pltn_fre2 =
{
11, /* SFrame FRE start address. */
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* .sframe FRE covering the second .plt section entry. */
static const sframe_frame_row_entry elf_x86_64_sframe_sec_pltn_fre1 =
{
0, /* SFrame FRE start address. */
SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B), /* FRE info. */
{8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* 12 bytes. */
};
/* SFrame helper object for non-lazy PLT. Also used for IBT enabled PLT. */
static const struct elf_x86_sframe_plt elf_x86_64_sframe_non_lazy_plt =
{
LAZY_PLT_ENTRY_SIZE,
2, /* Number of FREs for PLT0. */
/* Array of SFrame FREs for plt0. */
{ &elf_x86_64_sframe_plt0_fre1, &elf_x86_64_sframe_plt0_fre2 },
LAZY_PLT_ENTRY_SIZE,
1, /* Number of FREs for PLTn. */
/* Array of SFrame FREs for plt. */
{ &elf_x86_64_sframe_sec_pltn_fre1, &elf_x86_64_sframe_null_fre },
0,
0, /* There is no second PLT necessary. */
{ &elf_x86_64_sframe_null_fre }
};
/* SFrame helper object for lazy PLT. Also used for IBT enabled PLT. */
static const struct elf_x86_sframe_plt elf_x86_64_sframe_plt =
{
LAZY_PLT_ENTRY_SIZE,
2, /* Number of FREs for PLT0. */
/* Array of SFrame FREs for plt0. */
{ &elf_x86_64_sframe_plt0_fre1, &elf_x86_64_sframe_plt0_fre2 },
LAZY_PLT_ENTRY_SIZE,
2, /* Number of FREs for PLTn. */
/* Array of SFrame FREs for plt. */
{ &elf_x86_64_sframe_pltn_fre1, &elf_x86_64_sframe_pltn_fre2 },
NON_LAZY_PLT_ENTRY_SIZE,
1, /* Number of FREs for PLTn for second PLT. */
/* FREs for second plt ( unwind info for .plt.got is
identical). Used when IBT or non-lazy PLT is in effect. */
{ &elf_x86_64_sframe_sec_pltn_fre1 }
};
/* These are the standard parameters. */
static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
{
@ -971,7 +1053,6 @@ static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
};
static bool
elf64_x86_64_elf_object_p (bfd *abfd)
{
@ -5228,6 +5309,20 @@ elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
}
if (ABI_64_P (info->output_bfd))
{
init_table.sframe_lazy_plt = &elf_x86_64_sframe_plt;
init_table.sframe_non_lazy_plt = &elf_x86_64_sframe_non_lazy_plt;
init_table.sframe_lazy_ibt_plt = &elf_x86_64_sframe_plt;
init_table.sframe_non_lazy_ibt_plt = &elf_x86_64_sframe_non_lazy_plt;
}
else
{
/* SFrame is not supported for non AMD64. */
init_table.sframe_lazy_plt = NULL;
init_table.sframe_non_lazy_plt = NULL;
}
if (ABI_64_P (info->output_bfd))
{
init_table.r_info = elf64_r_info;

52
bfd/elflink.c
View File

@ -10900,6 +10900,7 @@ elf_section_ignore_discarded_relocs (asection *sec)
case SEC_INFO_TYPE_STABS:
case SEC_INFO_TYPE_EH_FRAME:
case SEC_INFO_TYPE_EH_FRAME_ENTRY:
case SEC_INFO_TYPE_SFRAME:
return true;
default:
break;
@ -10938,6 +10939,9 @@ _bfd_elf_default_action_discarded (asection *sec)
&& strncmp (sec->name, ".eh_frame.", 10) == 0)
return 0;
if (strcmp (".sframe", sec->name) == 0)
return 0;
if (strcmp (".gcc_except_table", sec->name) == 0)
return 0;
@ -11871,6 +11875,16 @@ elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
return false;
}
break;
case SEC_INFO_TYPE_SFRAME:
{
/* Merge .sframe sections into the ctf frame encoder
context of the output_bfd's section. The final .sframe
output section will be written out later. */
if (!_bfd_elf_merge_section_sframe (output_bfd, flinfo->info,
o, contents))
return false;
}
break;
default:
{
if (! (o->flags & SEC_EXCLUDE))
@ -13454,6 +13468,9 @@ bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
goto error_return;
if (! _bfd_elf_write_section_sframe (abfd, info))
goto error_return;
if (info->callbacks->emit_ctf)
info->callbacks->emit_ctf ();
@ -14909,6 +14926,41 @@ bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
_bfd_elf_adjust_eh_frame_global_symbol, NULL);
}
o = bfd_get_section_by_name (output_bfd, ".sframe");
if (o != NULL)
{
asection *i;
for (i = o->map_head.s; i != NULL; i = i->map_head.s)
{
if (i->size == 0)
continue;
abfd = i->owner;
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
continue;
if (!init_reloc_cookie_for_section (&cookie, info, i))
return -1;
if (_bfd_elf_parse_sframe (abfd, info, i, &cookie))
{
if (_bfd_elf_discard_section_sframe (i,
bfd_elf_reloc_symbol_deleted_p,
&cookie))
{
if (i->size != i->rawsize)
changed = 1;
}
}
fini_reloc_cookie_for_section (&cookie, i);
}
/* Update the reference to the output .sframe section. Used to
determine later if PT_GNU_SFRAME segment is to be generated. */
if (!_bfd_elf_set_section_sframe (output_bfd, info))
return -1;
}
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
{
const struct elf_backend_data *bed;

375
bfd/elfxx-x86.c
View File

@ -1777,6 +1777,191 @@ elf_x86_relative_reloc_compare (const void *pa, const void *pb)
return 0;
}
enum dynobj_sframe_plt_type
{
SFRAME_PLT = 1,
SFRAME_PLT_SEC = 2
};
/* Create SFrame unwind info for the plt entries in the .plt section
of type PLT_SEC_TYPE. */
static bool
_bfd_x86_elf_create_sframe_plt (bfd *output_bfd,
struct bfd_link_info *info,
unsigned int plt_sec_type)
{
struct elf_x86_link_hash_table *htab;
const struct elf_backend_data *bed;
bool plt0_generated_p;
unsigned int plt0_entry_size;
unsigned char func_info;
unsigned int fre_type;
/* The dynamic plt section for which .sframe unwind information is being
created. */
asection *dpltsec;
int err = 0;
sframe_encoder_ctx **ectx = NULL;
unsigned plt_entry_size = 0;
unsigned int num_pltn_fres = 0;
unsigned int num_pltn_entries = 0;
bed = get_elf_backend_data (output_bfd);
htab = elf_x86_hash_table (info, bed->target_id);
/* Whether SFrame unwind info for plt0 is to be generated. */
plt0_generated_p = htab->plt.has_plt0;
plt0_entry_size
= (plt0_generated_p) ? htab->sframe_plt->plt0_entry_size : 0;
switch (plt_sec_type)
{
case SFRAME_PLT:
{
ectx = &htab->plt_cfe_ctx;
dpltsec = htab->elf.splt;
plt_entry_size = htab->plt.plt_entry_size;
num_pltn_fres = htab->sframe_plt->pltn_num_fres;
num_pltn_entries
= (htab->elf.splt->size - plt0_entry_size) / plt_entry_size;
break;
}
case SFRAME_PLT_SEC:
{
ectx = &htab->plt_second_cfe_ctx;
/* FIXME - this or htab->plt_second_sframe ? */
dpltsec = htab->plt_second_eh_frame;
plt_entry_size = htab->sframe_plt->sec_pltn_entry_size;
num_pltn_fres = htab->sframe_plt->sec_pltn_num_fres;
num_pltn_entries
= htab->plt_second_eh_frame->size / plt_entry_size;
break;
}
default:
/* No other value is possible. */
return false;
break;
}
*ectx = sframe_encode (SFRAME_VERSION_1,
0,
SFRAME_ABI_AMD64_ENDIAN_LITTLE,
SFRAME_CFA_FIXED_FP_INVALID,
-8, /* Fixed RA offset. */
&err);
/* FRE type is dependent on the size of the function. */
fre_type = sframe_calc_fre_type (dpltsec->size);
func_info = sframe_fde_func_info (fre_type,
SFRAME_FDE_TYPE_PCINC);
/* Add SFrame FDE and the associated FREs for plt0 if plt0 has been
generated. */
if (plt0_generated_p)
{
/* Add SFrame FDE for plt0, the function start address is updated later
at _bfd_elf_merge_section_sframe time. */
sframe_encoder_add_funcdesc (*ectx,
0, /* func start addr. */
plt0_entry_size,
func_info,
0 /* Num FREs. */);
sframe_frame_row_entry plt0_fre;
unsigned int num_plt0_fres = htab->sframe_plt->plt0_num_fres;
for (unsigned int j = 0; j < num_plt0_fres; j++)
{
plt0_fre = *(htab->sframe_plt->plt0_fres[j]);
sframe_encoder_add_fre (*ectx, 0, &plt0_fre);
}
}
if (num_pltn_entries)
{
/* pltn entries use an SFrame FDE of type
SFRAME_FDE_TYPE_PCMASK to exploit the repetitive
pattern of the instructions in these entries. Using this SFrame FDE
type helps in keeping the unwind information for pltn entries
compact. */
func_info = sframe_fde_func_info (fre_type, SFRAME_FDE_TYPE_PCMASK);
/* Add the SFrame FDE for all PCs starting at the first pltn entry (hence,
function start address = plt0_entry_size. As usual, this will be
updated later at _bfd_elf_merge_section_sframe, by when the
sections are relocated. */
sframe_encoder_add_funcdesc (*ectx,
plt0_entry_size, /* func start addr. */
dpltsec->size - plt0_entry_size,
func_info,
0 /* Num FREs. */);
sframe_frame_row_entry pltn_fre;
/* Now add the FREs for pltn. Simply adding the two FREs suffices due
to the usage of SFRAME_FDE_TYPE_PCMASK above. */
for (unsigned int j = 0; j < num_pltn_fres; j++)
{
pltn_fre = *(htab->sframe_plt->pltn_fres[j]);
sframe_encoder_add_fre (*ectx, 1, &pltn_fre);
}
}
return true;
}
/* Put contents of the .sframe section corresponding to the specified
PLT_SEC_TYPE. */
static bool
_bfd_x86_elf_write_sframe_plt (bfd *output_bfd,
struct bfd_link_info *info,
unsigned int plt_sec_type)
{
struct elf_x86_link_hash_table *htab;
const struct elf_backend_data *bed;
sframe_encoder_ctx *ectx;
size_t sec_size;
asection *sec;
bfd *dynobj;
int err = 0;
bed = get_elf_backend_data (output_bfd);
htab = elf_x86_hash_table (info, bed->target_id);
dynobj = htab->elf.dynobj;
switch (plt_sec_type)
{
case SFRAME_PLT:
ectx = htab->plt_cfe_ctx;
sec = htab->plt_sframe;
break;
case SFRAME_PLT_SEC:
ectx = htab->plt_second_cfe_ctx;
sec = htab->plt_second_sframe;
break;
default:
/* No other value is possible. */
return false;
break;
}
BFD_ASSERT (ectx);
void *contents = sframe_encoder_write (ectx, &sec_size, &err);
sec->size = (bfd_size_type) sec_size;
sec->contents = (unsigned char *) bfd_zalloc (dynobj, sec->size);
memcpy (sec->contents, contents, sec_size);
sframe_encoder_free (&ectx);
return true;
}
bool
_bfd_elf_x86_size_relative_relocs (struct bfd_link_info *info,
bool *need_layout)
@ -2267,6 +2452,42 @@ _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
= htab->non_lazy_plt->eh_frame_plt_size;
}
/* No need to size the .sframe section explicitly because the write-out
mechanism is different. Simply prep up the FDE/FRE for the
.plt section. */
if (_bfd_elf_sframe_present (info))
{
if (htab->plt_sframe != NULL
&& htab->elf.splt != NULL
&& htab->elf.splt->size != 0
&& !bfd_is_abs_section (htab->elf.splt->output_section))
{
_bfd_x86_elf_create_sframe_plt (output_bfd, info, SFRAME_PLT);
/* FIXME - Dirty Hack. Set the size to something non-zero for now,
so that the section does not get stripped out below. The precise
size of this section is known only when the contents are
serialized in _bfd_x86_elf_write_sframe_plt. */
htab->plt_sframe->size = sizeof (sframe_header) + 1;
}
/* FIXME - generate for .got.plt ? */
/* Unwind info for the second PLT. */
if (htab->plt_second_sframe != NULL
&& htab->plt_second != NULL
&& htab->plt_second->size != 0
&& !bfd_is_abs_section (htab->plt_second->output_section))
{
_bfd_x86_elf_create_sframe_plt (output_bfd, info,
SFRAME_PLT_SEC);
/* FIXME - Dirty Hack. Set the size to something non-zero for now,
so that the section does not get stripped out below. The precise
size of this section is known only when the contents are
serialized in _bfd_x86_elf_write_sframe_plt. */
htab->plt_second_sframe->size = sizeof (sframe_header) + 1;
}
}
/* We now have determined the sizes of the various dynamic sections.
Allocate memory for them. */
relocs = false;
@ -2302,6 +2523,8 @@ _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
|| s == htab->plt_eh_frame
|| s == htab->plt_got_eh_frame
|| s == htab->plt_second_eh_frame
|| s == htab->plt_sframe
|| s == htab->plt_second_sframe
|| s == htab->elf.sdynbss
|| s == htab->elf.sdynrelro)
{
@ -2344,6 +2567,11 @@ _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
if ((s->flags & SEC_HAS_CONTENTS) == 0)
continue;
/* Skip allocating contents for .sframe section as it is written
out differently. See below. */
if ((s == htab->plt_sframe) || (s == htab->plt_second_sframe))
continue;
/* NB: Initially, the iplt section has minimal alignment to
avoid moving dot of the following section backwards when
it is empty. Update its section alignment now since it
@ -2393,6 +2621,21 @@ _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
+ PLT_FDE_LEN_OFFSET));
}
if (_bfd_elf_sframe_present (info))
{
if (htab->plt_sframe != NULL
&& htab->elf.splt != NULL
&& htab->elf.splt->size != 0
&& htab->plt_sframe->contents == NULL)
_bfd_x86_elf_write_sframe_plt (output_bfd, info, SFRAME_PLT);
if (htab->plt_second_sframe != NULL
&& htab->elf.splt != NULL
&& htab->elf.splt->size != 0
&& htab->plt_second_sframe->contents == NULL)
_bfd_x86_elf_write_sframe_plt (output_bfd, info, SFRAME_PLT_SEC);
}
return _bfd_elf_maybe_vxworks_add_dynamic_tags (output_bfd, info,
relocs);
}
@ -2607,6 +2850,74 @@ _bfd_x86_elf_finish_dynamic_sections (bfd *output_bfd,
}
}
/* Make any adjustment if necessary and merge .sframe section to
create the final .sframe section for output_bfd. */
if (htab->plt_sframe != NULL
&& htab->plt_sframe->contents != NULL)
{
if (htab->elf.splt != NULL
&& htab->elf.splt->size != 0
&& (htab->elf.splt->flags & SEC_EXCLUDE) == 0
&& htab->elf.splt->output_section != NULL
&& htab->plt_sframe->output_section != NULL)
{
bfd_vma plt_start = htab->elf.splt->output_section->vma;
bfd_vma sframe_start = htab->plt_sframe->output_section->vma
+ htab->plt_sframe->output_offset
+ PLT_SFRAME_FDE_START_OFFSET;
#if 0 /* FIXME Testing only. Remove before review. */
bfd_vma test_value = (plt_start - sframe_start)
+ htab->plt_sframe->output_section->vma
+ htab->plt_sframe->output_offset
+ PLT_SFRAME_FDE_START_OFFSET;
bfd_put_signed_32 (dynobj, test_value,
#endif
bfd_put_signed_32 (dynobj, plt_start - sframe_start,
htab->plt_sframe->contents
+ PLT_SFRAME_FDE_START_OFFSET);
}
if (htab->plt_sframe->sec_info_type == SEC_INFO_TYPE_SFRAME)
{
if (! _bfd_elf_merge_section_sframe (output_bfd, info,
htab->plt_sframe,
htab->plt_sframe->contents))
return NULL;
}
}
if (htab->plt_second_sframe != NULL
&& htab->plt_second_sframe->contents != NULL)
{
if (htab->plt_second != NULL
&& htab->plt_second->size != 0
&& (htab->plt_second->flags & SEC_EXCLUDE) == 0
&& htab->plt_second->output_section != NULL
&& htab->plt_second_sframe->output_section != NULL)
{
bfd_vma plt_start = htab->plt_second->output_section->vma;
bfd_vma sframe_start
= (htab->plt_second_sframe->output_section->vma
+ htab->plt_second_sframe->output_offset
+ PLT_SFRAME_FDE_START_OFFSET);
#if 0 /* FIXME Testing only. Remove before review. */
bfd_vma test_value = (plt_start - sframe_start)
+ htab->plt_second_sframe->output_section->vma
+ htab->plt_second_sframe->output_offset
+ PLT_SFRAME_FDE_START_OFFSET;
bfd_put_signed_32 (dynobj, test_value,
#endif
bfd_put_signed_32 (dynobj, plt_start - sframe_start,
htab->plt_second_sframe->contents
+ PLT_SFRAME_FDE_START_OFFSET);
}
if (htab->plt_second_sframe->sec_info_type == SEC_INFO_TYPE_SFRAME)
{
if (! _bfd_elf_merge_section_sframe (output_bfd, info,
htab->plt_second_sframe,
htab->plt_second_sframe->contents))
return NULL;
}
}
if (htab->elf.sgot && htab->elf.sgot->size > 0)
elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
= htab->got_entry_size;
@ -3949,12 +4260,36 @@ _bfd_x86_elf_link_setup_gnu_properties
pltsec = htab->elf.splt;
/* If the non-lazy PLT is available, use it for all PLT entries if
there are no PLT0 or no .plt section. */
if (htab->non_lazy_plt != NULL
&& (!htab->plt.has_plt0 || pltsec == NULL))
lazy_plt = false;
else
lazy_plt = true;
if (normal_target)
{
if (use_ibt_plt)
{
if (lazy_plt)
htab->sframe_plt = init_table->sframe_lazy_ibt_plt;
else
htab->sframe_plt = init_table->sframe_non_lazy_ibt_plt;
}
else
{
if (lazy_plt)
htab->sframe_plt = init_table->sframe_lazy_plt;
else
htab->sframe_plt = init_table->sframe_non_lazy_plt;
}
}
else
htab->sframe_plt = NULL;
/* If the non-lazy PLT is available, use it for all PLT entries if
there are no PLT0 or no .plt section. */
if (!lazy_plt)
{
lazy_plt = false;
if (bfd_link_pic (info))
htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry;
else
@ -3969,7 +4304,6 @@ _bfd_x86_elf_link_setup_gnu_properties
}
else
{
lazy_plt = true;
if (bfd_link_pic (info))
{
htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry;
@ -4145,6 +4479,39 @@ _bfd_x86_elf_link_setup_gnu_properties
htab->plt_second_eh_frame = sec;
}
}
/* .sframe sections are emitted for AMD64 ABI only. */
if (ABI_64_P (info->output_bfd) && !info->no_ld_generated_unwind_info)
{
flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
| SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
sec = bfd_make_section_anyway_with_flags (dynobj,
".sframe",
flags);
if (sec == NULL)
info->callbacks->einfo (_("%F%P: failed to create PLT .sframe section\n"));
// FIXME check this
// if (!bfd_set_section_alignment (sec, class_align))
// goto error_alignment;
htab->plt_sframe = sec;
/* Second PLT is generated for Intel IBT / MPX Support + lazy plt. */
if (htab->plt_second != NULL)
{
sec = bfd_make_section_anyway_with_flags (dynobj,
".sframe",
flags);
if (sec == NULL)
info->callbacks->einfo (_("%F%P: failed to create second PLT .sframe section\n"));
htab->plt_second_sframe = sec;
}
/* FIXME - add later for plt_got. */
}
}
/* The .iplt section is used for IFUNC symbols in static

49
bfd/elfxx-x86.h
View File

@ -30,6 +30,7 @@
#include "elf-linker-x86.h"
#include "elf/i386.h"
#include "elf/x86-64.h"
#include "sframe-api.h"
#define X86_64_PCREL_TYPE_P(TYPE) \
((TYPE) == R_X86_64_PC8 \
@ -105,6 +106,11 @@
|| (TYPE) == R_X86_64_PC32_BND \
|| (TYPE) == R_X86_64_PC64)
/* This must be the same as sframe_get_hdr_size (sfh). For x86-64, this value
is the same as sizeof (sframe_header) because there is no SFrame auxilliary
header. */
#define PLT_SFRAME_FDE_START_OFFSET sizeof (sframe_header)
#define ABI_64_P(abfd) \
(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
@ -388,6 +394,24 @@ struct elf_x86_link_hash_entry
bfd_vma tlsdesc_got;
};
#define SFRAME_PLT0_MAX_NUM_FRES 2
#define SFRAME_PLTN_MAX_NUM_FRES 2
struct elf_x86_sframe_plt
{
unsigned int plt0_entry_size;
unsigned int plt0_num_fres;
const sframe_frame_row_entry *plt0_fres[SFRAME_PLT0_MAX_NUM_FRES];
unsigned int pltn_entry_size;
unsigned int pltn_num_fres;
const sframe_frame_row_entry *pltn_fres[SFRAME_PLTN_MAX_NUM_FRES];
unsigned int sec_pltn_entry_size;
unsigned int sec_pltn_num_fres;
const sframe_frame_row_entry *sec_pltn_fres[SFRAME_PLTN_MAX_NUM_FRES];
};
struct elf_x86_lazy_plt_layout
{
/* The first entry in a lazy procedure linkage table looks like this. */
@ -584,6 +608,11 @@ struct elf_x86_link_hash_table
asection *plt_got;
asection *plt_got_eh_frame;
sframe_encoder_ctx *plt_cfe_ctx;
asection *plt_sframe;
sframe_encoder_ctx *plt_second_cfe_ctx;
asection *plt_second_sframe;
/* Parameters describing PLT generation, lazy or non-lazy. */
struct elf_x86_plt_layout plt;
@ -593,6 +622,10 @@ struct elf_x86_link_hash_table
/* Parameters describing non-lazy PLT generation. */
const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
/* The .sframe helper object for .plt section.
This is used for x86-64 only. */
const struct elf_x86_sframe_plt *sframe_plt;
union
{
bfd_signed_vma refcount;
@ -682,6 +715,22 @@ struct elf_x86_init_table
/* The non-lazy PLT layout for IBT. */
const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
/* The .sframe helper object for lazy .plt section.
This is used for x86-64 only. */
const struct elf_x86_sframe_plt *sframe_lazy_plt;
/* The .sframe helper object for non-lazy .plt section.
This is used for x86-64 only. */
const struct elf_x86_sframe_plt *sframe_non_lazy_plt;
/* The .sframe helper object for lazy IBT .plt section.
This is used for x86-64 only. */
const struct elf_x86_sframe_plt *sframe_lazy_ibt_plt;
/* The .sframe helper object for non-lazy IBT .plt section.
This is used for x86-64 only. */
const struct elf_x86_sframe_plt *sframe_non_lazy_ibt_plt;
bfd_byte plt0_pad_byte;
bfd_vma (*r_info) (bfd_vma, bfd_vma);

1
bfd/section.c
View File

@ -409,6 +409,7 @@ CODE_FRAGMENT
.#define SEC_INFO_TYPE_JUST_SYMS 4
.#define SEC_INFO_TYPE_TARGET 5
.#define SEC_INFO_TYPE_EH_FRAME_ENTRY 6
.#define SEC_INFO_TYPE_SFRAME 7
.
. {* Nonzero if this section uses RELA relocations, rather than REL. *}
. unsigned int use_rela_p:1;

1
binutils/readelf.c
View File

@ -4604,6 +4604,7 @@ get_segment_type (Filedata * filedata, unsigned long p_type)
case PT_GNU_STACK: return "GNU_STACK";
case PT_GNU_RELRO: return "GNU_RELRO";
case PT_GNU_PROPERTY: return "GNU_PROPERTY";
case PT_GNU_SFRAME: return "GNU_SFRAME";
case PT_OPENBSD_RANDOMIZE: return "OPENBSD_RANDOMIZE";
case PT_OPENBSD_WXNEEDED: return "OPENBSD_WXNEEDED";

1
include/elf/common.h
View File

@ -489,6 +489,7 @@
#define PT_GNU_STACK (PT_LOOS + 0x474e551) /* Stack flags */
#define PT_GNU_RELRO (PT_LOOS + 0x474e552) /* Read-only after relocation */
#define PT_GNU_PROPERTY (PT_LOOS + 0x474e553) /* GNU property */
#define PT_GNU_SFRAME (PT_LOOS + 0x474e554) /* SFrame unwind information */
/* OpenBSD segment types. */
#define PT_OPENBSD_RANDOMIZE (PT_LOOS + 0x5a3dbe6) /* Fill with random data. */

1
include/elf/internal.h
View File

@ -339,6 +339,7 @@ struct elf_segment_map
|| (segment)->p_type == PT_GNU_EH_FRAME \
|| (segment)->p_type == PT_GNU_STACK \
|| (segment)->p_type == PT_GNU_RELRO \
|| (segment)->p_type == PT_GNU_SFRAME \
|| ((segment)->p_type >= PT_GNU_MBIND_LO \
&& (segment)->p_type <= PT_GNU_MBIND_HI))) \
/* Any section besides one of type SHT_NOBITS must have file \

2
include/sframe-api.h
View File

@ -187,7 +187,7 @@ sframe_encode (unsigned char ver, unsigned char flags, int abi,
/* Free the encoder context. */
extern void
sframe_free_encoder (sframe_encoder_ctx *encoder);
sframe_encoder_free (sframe_encoder_ctx **encoder);
/* Get the size of the SFrame header from the encoder ctx ENCODER. */
extern unsigned int

2
ld/Makefile.am
View File

@ -972,6 +972,7 @@ EXTRA_ld_new_SOURCES += $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES)
# This is the real libbfd.a and libctf.a created by libtool.
TESTBFDLIB = @TESTBFDLIB@
TESTCTFLIB = @TESTCTFLIB@
TESTSFRAMELIB = @TESTSFRAMELIB@
check-DEJAGNU: site.exp
(cd .libs; test -e ldscripts || test ! -e ld-new || $(LN_S) ../ldscripts .)
@ -989,6 +990,7 @@ check-DEJAGNU: site.exp
CXX_FOR_TARGET="$(CXX_FOR_TARGET)" \
CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
SFRAMELIB="$(TESTSFRAMELIB)" \
LIBIBERTY="$(LIBIBERTY) $(LIBINTL)" LIBS="$(LIBS)" \
DO_COMPARE="`echo '$(do_compare)' | sed -e 's,\\$$,,g'`" \
$(RUNTESTFLAGS); \

2
ld/Makefile.in
View File

@ -470,6 +470,7 @@ TARGET_SYSTEM_ROOT_DEFINE = @TARGET_SYSTEM_ROOT_DEFINE@
# This is the real libbfd.a and libctf.a created by libtool.
TESTBFDLIB = @TESTBFDLIB@
TESTCTFLIB = @TESTCTFLIB@
TESTSFRAMELIB = @TESTSFRAMELIB@
USE_NLS = @USE_NLS@
VERSION = @VERSION@
WARN_CFLAGS = @WARN_CFLAGS@
@ -2642,6 +2643,7 @@ check-DEJAGNU: site.exp
CXX_FOR_TARGET="$(CXX_FOR_TARGET)" \
CXXFLAGS_FOR_TARGET="$(CXXFLAGS_FOR_TARGET)" \
OFILES="$(OFILES)" BFDLIB="$(TESTBFDLIB)" CTFLIB="$(TESTCTFLIB) $(ZLIB)" \
SFRAMELIB="$(TESTSFRAMELIB)" \
LIBIBERTY="$(LIBIBERTY) $(LIBINTL)" LIBS="$(LIBS)" \
DO_COMPARE="`echo '$(do_compare)' | sed -e 's,\\$$,,g'`" \
$(RUNTESTFLAGS); \

8
ld/configure vendored
View File

@ -634,6 +634,7 @@ ac_subst_vars='am__EXEEXT_FALSE
am__EXEEXT_TRUE
LTLIBOBJS
LIBOBJS
TESTSFRAMELIB
TESTCTFLIB
TESTBFDLIB
EMULATION_LIBPATH
@ -11624,7 +11625,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 11627 "configure"
#line 11628 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -11730,7 +11731,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 11733 "configure"
#line 11734 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -17487,9 +17488,11 @@ EMULATION_LIBPATH=$all_libpath
if test x${enable_static} = xno; then
TESTBFDLIB="-Wl,--rpath,../bfd/.libs ../bfd/.libs/libbfd.so"
TESTCTFLIB="-Wl,--rpath,../libctf/.libs ../libctf/.libs/libctf.so"
TESTSFRAMELIB="-Wl,--rpath,../libsframe/.libs ../libsframe/.libs/libsframe.so"
else
TESTBFDLIB="../bfd/.libs/libbfd.a"
TESTCTFLIB="../libctf/.libs/libctf.a"
TESTSFRAMELIB="../libsframe/.libs/libsframe.a"
fi
if test "${enable_libctf}" = no; then
TESTCTFLIB=
@ -17497,6 +17500,7 @@ fi
target_vendor=${target_vendor=$host_vendor}
case "$target_vendor" in
hp) EXTRA_SHLIB_EXTENSION=".sl" ;;

3
ld/configure.ac
View File

@ -628,15 +628,18 @@ AC_SUBST(EMULATION_LIBPATH)
if test x${enable_static} = xno; then
TESTBFDLIB="-Wl,--rpath,../bfd/.libs ../bfd/.libs/libbfd.so"
TESTCTFLIB="-Wl,--rpath,../libctf/.libs ../libctf/.libs/libctf.so"
TESTSFRAMELIB="-Wl,--rpath,../libsframe/.libs ../libsframe/.libs/libsframe.so"
else
TESTBFDLIB="../bfd/.libs/libbfd.a"
TESTCTFLIB="../libctf/.libs/libctf.a"
TESTSFRAMELIB="../libsframe/.libs/libsframe.a"
fi
if test "${enable_libctf}" = no; then
TESTCTFLIB=
fi
AC_SUBST(TESTBFDLIB)
AC_SUBST(TESTCTFLIB)
AC_SUBST(TESTSFRAMELIB)
target_vendor=${target_vendor=$host_vendor}
case "$target_vendor" in

4
ld/ld.texi
View File

@ -2837,7 +2837,9 @@ section and ELF @code{PT_GNU_EH_FRAME} segment header.
@item --no-ld-generated-unwind-info
Request creation of @code{.eh_frame} unwind info for linker
generated code sections like PLT. This option is on by default
if linker generated unwind info is supported.
if linker generated unwind info is supported. This option also
controls the generation of @code{.sframe} unwind info for linker
generated code sections like PLT.
@kindex --enable-new-dtags
@kindex --disable-new-dtags

2
ld/scripttempl/elf.sc
View File

@ -601,6 +601,7 @@ cat <<EOF
${OTHER_READONLY_SECTIONS}
.eh_frame_hdr ${RELOCATING-0} : { *(.eh_frame_hdr)${RELOCATING+ *(.eh_frame_entry .eh_frame_entry.*)} }
.eh_frame ${RELOCATING-0} : ONLY_IF_RO { KEEP (*(.eh_frame))${RELOCATING+ *(.eh_frame.*)} }
.sframe ${RELOCATING-0} : ONLY_IF_RO { *(.sframe)${RELOCATING+ *(.sframe.*)} }
.gcc_except_table ${RELOCATING-0} : ONLY_IF_RO { *(.gcc_except_table${RELOCATING+ .gcc_except_table.*}) }
.gnu_extab ${RELOCATING-0} : ONLY_IF_RO { *(.gnu_extab*) }
/* These sections are generated by the Sun/Oracle C++ compiler. */
@ -619,6 +620,7 @@ cat <<EOF
/* Exception handling */
.eh_frame ${RELOCATING-0} : ONLY_IF_RW { KEEP (*(.eh_frame))${RELOCATING+ *(.eh_frame.*)} }
.sframe ${RELOCATING-0} : ONLY_IF_RW { *(.sframe)${RELOCATING+ *(.sframe.*)} }
.gnu_extab ${RELOCATING-0} : ONLY_IF_RW { *(.gnu_extab) }
.gcc_except_table ${RELOCATING-0} : ONLY_IF_RW { *(.gcc_except_table${RELOCATING+ .gcc_except_table.*}) }
.exception_ranges ${RELOCATING-0} : ONLY_IF_RW { *(.exception_ranges${RELOCATING+*}) }

4
ld/testsuite/ld-aarch64/aarch64-elf.exp
View File

@ -457,3 +457,7 @@ run_dump_test "bti-pac-plt-2"
run_dump_test "bti-warn"
run_dump_test "weak-tls"
run_dump_test "undef-tls"
if { ![skip_sframe_tests] } {
run_dump_test "sframe-simple-1"
}

7
ld/testsuite/ld-aarch64/sframe-bar.s Normal file
View File

@ -0,0 +1,7 @@
.cfi_startproc
cmp w0, 1000
bgt .L4
ret
.L4:
b foo
.cfi_endproc

10
ld/testsuite/ld-aarch64/sframe-foo.s Normal file
View File

@ -0,0 +1,10 @@
.cfi_startproc
mov w1, 26215
movk w1, 0x6666, lsl 16
smull x1, w0, w1
asr x1, x1, 34
sub w1, w1, w0, asr 31
add w1, w1, w1, lsl 2
sub w0, w0, w1, lsl 1
ret
.cfi_endproc

26
ld/testsuite/ld-aarch64/sframe-simple-1.d Normal file
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@ -0,0 +1,26 @@
#as: --gsframe
#source: sframe-foo.s
#source: sframe-bar.s
#objdump: --sframe=.sframe
#ld: -shared
#name: SFrame Simple link
.*: file format .*
Contents of the SFrame section .sframe:
Header :
Version: SFRAME_VERSION_1
Flags: SFRAME_F_FDE_SORTED
Num FDEs: 2
Num FREs: 2
Function Index :
#...
STARTPC +CFA +FP +RA +
0+[0-9a-f]+ +sp\+0 +u +u +
#...
STARTPC +CFA +FP +RA +
0+[0-9a-f]+ +sp\+0 +u +u +

8
ld/testsuite/ld-bootstrap/bootstrap.exp
View File

@ -184,7 +184,7 @@ foreach flags $test_flags {
setup_xfail "mips*-*-irix5*"
}
if ![ld_link $CC tmpdir/ld1 "$CFLAGS $flags tmpdir/ld-partial.o $CTFLIB $BFDLIB $LIBIBERTY $extralibs"] {
if ![ld_link $CC tmpdir/ld1 "$CFLAGS $flags tmpdir/ld-partial.o $CTFLIB $BFDLIB $LIBIBERTY $SFRAMELIB $extralibs"] {
fail $testname
continue
}
@ -201,13 +201,13 @@ foreach flags $test_flags {
}
regsub /tmpdir/ld/ $gcc_B_opt_save /tmpdir/gccld1/ gcc_B_opt
if ![ld_link $CC tmpdir/ld2 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $extralibs"] {
if ![ld_link $CC tmpdir/ld2 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $SFRAMELIB $extralibs"] {
fail $testname
continue
}
regsub /tmpdir/ld/ $gcc_B_opt_save /tmpdir/gccld2/ gcc_B_opt
if ![ld_link $CC tmpdir/ld3 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $extralibs"] {
if ![ld_link $CC tmpdir/ld3 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $SFRAMELIB $extralibs"] {
fail $testname
continue
}
@ -220,7 +220,7 @@ foreach flags $test_flags {
# generated by different linkers, tmpdir/ld1 and tmpdir/ld2.
# So we rebuild tmpdir/ld2 with tmpdir/ld3.
regsub /tmpdir/ld/ $gcc_B_opt_save /tmpdir/gccld3/ gcc_B_opt
if ![ld_link $CC tmpdir/ld2 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $extralibs"] {
if ![ld_link $CC tmpdir/ld2 "$CFLAGS $flags $OFILES $CTFLIB $BFDLIB $LIBIBERTY $SFRAMELIB $extralibs"] {
fail $testname
continue
}

10
ld/testsuite/ld-sframe/discard.d Normal file
View File

@ -0,0 +1,10 @@
#as:
#source: discard.s
#ld: -T discard.ld
#objdump: -hw
#name: Check that SFrame section can be discarded
#failif
#...
[0-9] .sframe .*
#...

9
ld/testsuite/ld-sframe/discard.ld Normal file
View File

@ -0,0 +1,9 @@
ENTRY(_start)
SECTIONS
{
. = SIZEOF_HEADERS;
/* Sections to be discarded */
/DISCARD/ : {
*(.sframe)
}
}

13
ld/testsuite/ld-sframe/discard.s Normal file
View File

@ -0,0 +1,13 @@
.text
.cfi_sections .sframe
.globl foo
.type foo, @function
foo:
.cfi_startproc
.cfi_def_cfa_offset 16
.cfi_def_cfa 7, 8
.cfi_endproc
.globl _start
_start:
.long foo

10
ld/testsuite/ld-sframe/sframe-empty.d Normal file
View File

@ -0,0 +1,10 @@
#as:
#source: sframe-empty.s
#objdump: -hw
#ld: -shared
#name: Empty SFrame section
#failif
#...
[0-9] .sframe .*
#...

2
ld/testsuite/ld-sframe/sframe-empty.s Normal file
View File

@ -0,0 +1,2 @@
.cfi_startproc
.cfi_endproc

47
ld/testsuite/ld-sframe/sframe.exp Normal file
View File

@ -0,0 +1,47 @@
# Copyright (C) 2022 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
#
if [skip_sframe_tests] {
unsupported "no SFrame format support in the assembler, or SFrame disabled"
return 0
}
if ![is_elf_format] {
unsupported "SFrame not supported"
return 0
}
if {[info exists env(LC_ALL)]} {
set old_lc_all $env(LC_ALL)
}
set env(LC_ALL) "C"
set sframe_test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
foreach sframe_test $sframe_test_list {
verbose [file rootname $sframe_test]
run_dump_test [file rootname $sframe_test]
}
if {[info exists old_lc_all]} {
set env(LC_ALL) $old_lc_all
} else {
unset env(LC_ALL)
}

31
ld/testsuite/ld-x86-64/sframe-bar.s Normal file
View File

@ -0,0 +1,31 @@
.file "sframe-bar.c"
.text
.globl bar
.type bar, @function
bar:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
movl %edi, -4(%rbp)
cmpl $1000, -4(%rbp)
jle .L2
movl -4(%rbp), %eax
movl %eax, %edi
call foo
jmp .L3
.L2:
movl -4(%rbp), %eax
.L3:
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size bar, .-bar
.ident "GCC: (GNU) 13.0.0 20220519 (experimental)"
.section .note.GNU-stack,"",@progbits

37
ld/testsuite/ld-x86-64/sframe-foo.s Normal file
View File

@ -0,0 +1,37 @@
.file "sframe-foo.c"
.text
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl %edi, -4(%rbp)
movl -4(%rbp), %ecx
movslq %ecx, %rax
imulq $1717986919, %rax, %rax
shrq $32, %rax
movl %eax, %edx
sarl $2, %edx
movl %ecx, %eax
sarl $31, %eax
subl %eax, %edx
movl %edx, %eax
sall $2, %eax
addl %edx, %eax
addl %eax, %eax
subl %eax, %ecx
movl %ecx, %edx
movl %edx, %eax
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 13.0.0 20220519 (experimental)"
.section .note.GNU-stack,"",@progbits

29
ld/testsuite/ld-x86-64/sframe-plt-1.d Normal file
View File

@ -0,0 +1,29 @@
#as: --gsframe
#source: sframe-foo.s
#source: sframe-bar.s
#objdump: --sframe=.sframe
#ld: -shared
#name: SFrame for plt0 and pltN
.*: +file format .*
Contents of the SFrame section .sframe:
Header :
Version: SFRAME_VERSION_1
Flags: SFRAME_F_FDE_SORTED
#...
Function Index :
func idx \[0\]: pc = 0x1000, size = 16 bytes
STARTPC +CFA +FP +RA +
0+1000 +sp\+16 +u +u +
0+1006 +sp\+24 +u +u +
func idx \[1\]: pc = 0x1010, size = 16 bytes
STARTPC\[m\] +CFA +FP +RA +
0+0000 +sp\+8 +u +u +
0+000b +sp\+16 +u +u +
#...

35
ld/testsuite/ld-x86-64/sframe-simple-1.d Normal file
View File

@ -0,0 +1,35 @@
#as: --gsframe
#source: sframe-foo.s
#source: sframe-bar.s
#objdump: --sframe=.sframe
#ld: -shared
#name: SFrame Simple link
.*: +file format .*
Contents of the SFrame section .sframe:
Header :
Version: SFRAME_VERSION_1
Flags: SFRAME_F_FDE_SORTED
#...
Function Index :
#...
#...
func idx \[2\]: pc = 0x1020, size = 53 bytes
STARTPC +CFA +FP +RA +
0+1020 +sp\+8 +u +u +
0+1021 +sp\+16 +c-16 +u +
0+1024 +fp\+16 +c-16 +u +
0+1054 +sp\+8 +c-16 +u +
func idx \[3\]: pc = 0x1055, size = 37 bytes
STARTPC +CFA +FP +RA +
0+1055 +sp\+8 +u +u +
0+1056 +sp\+16 +c-16 +u +
0+1059 +fp\+16 +c-16 +u +
0+1079 +sp\+8 +c-16 +u +

5
ld/testsuite/ld-x86-64/x86-64.exp
View File

@ -506,6 +506,11 @@ run_dump_test "dt-relr-1a-x32"
run_dump_test "dt-relr-1b"
run_dump_test "dt-relr-1b-x32"
if { ![skip_sframe_tests] } {
run_dump_test "sframe-simple-1"
run_dump_test "sframe-plt-1"
}
if ![istarget "x86_64-*-linux*"] {
return
}

45
ld/testsuite/lib/ld-lib.exp
View File

@ -1690,3 +1690,48 @@ proc skip_ctf_tests { } {
return 1
}
# Check if the assembler supports SFrame.
proc check_as_sframe { } {
global check_as_sframe_result
global as
if [info exists check_as_sframe_result] {
return $check_as_sframe_result
}
# SFrame generation needs CFI support
if { ![check_as_cfi] } {
set check_as_sframe_result 0;
return 0
}
set as_file "tmpdir/check_as_sframe.s"
set as_fh [open $as_file w 0666]
puts $as_fh "# Generated file. DO NOT EDIT"
puts $as_fh "\t.cfi_sections \".sframe\""
puts $as_fh "\t.cfi_startproc"
puts $as_fh "\t.cfi_endproc"
close $as_fh
remote_download host $as_file
verbose -log "Checking SFrame:"
set success [ld_assemble $as $as_file "/dev/null"]
#remote_file host delete $as_file
set check_as_sframe_result $success
return $success
}
proc skip_sframe_tests { } {
# FIXME TODO
# global enable_libsframe
#
# if {$enable_libsframe eq "no"} {
# return 1
# }
if [check_as_sframe] {
return 0
}
return 1
}

28
libsframe/sframe.c
View File

@ -1202,14 +1202,32 @@ sframe_encode (unsigned char ver, unsigned char flags, int abi_arch,
/* Free the encoder context. */
void
sframe_free_encoder (sframe_encoder_ctx *encoder)
sframe_encoder_free (sframe_encoder_ctx **encoder)
{
if (encoder != NULL)
{
free (encoder->sfe_funcdesc);
free (encoder->sfe_fres);
free (encoder->sfe_data);
free (encoder);
sframe_encoder_ctx *ectx = *encoder;
if (ectx == NULL)
return;
if (ectx->sfe_funcdesc != NULL)
{
free (ectx->sfe_funcdesc);
ectx->sfe_funcdesc = NULL;
}
if (ectx->sfe_fres != NULL)
{
free (ectx->sfe_fres);
ectx->sfe_fres = NULL;
}
if (ectx->sfe_data != NULL)
{
free (ectx->sfe_data);
ectx->sfe_data = NULL;
}
free (*encoder);
*encoder = NULL;
}
}