forked from Imagelibrary/binutils-gdb
9e65917652
Since the BND PLT has 230: 68 00 00 00 00 pushq $0x0 235: f2 e9 e5 ff ff ff bnd jmpq 220 <.plt> 23b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) instead of 230: ff 25 e2 0d 20 00 jmpq *0x200de2(%rip) # 201018 <func> 236: 68 00 00 00 00 pushq $0x0 23b: e9 e0 ff ff ff jmpq 220 <.plt> its unwind info should be DW_CFA_def_cfa_expression (DW_OP_breg7 (rsp): 8; DW_OP_breg16 (rip): 0; DW_OP_lit15; DW_OP_and; DW_OP_lit5; DW_OP_ge; DW_OP_lit3; DW_OP_shl; DW_OP_plus) bfd/ PR ld/21038 * elf64-x86-64.c (elf_x86_64_eh_frame_bnd_plt): New. (elf_x86_64_bnd_arch_bed): Use elf_x86_64_eh_frame_bnd_plt and elf_x86_64_eh_frame_plt_got. (elf_x86_64_size_dynamic_sections): Get unwind info from elf_x86_64_bnd_arch_bed for the BND PLT. ld/ PR ld/21038 * testsuite/ld-x86-64/pr21038a.d: New file. * testsuite/ld-x86-64/pr21038a.s: Likewise. * testsuite/ld-x86-64/pr21038b.d: Likewise. * testsuite/ld-x86-64/pr21038b.s: Likewise. * testsuite/ld-x86-64/x86-64.exp: Run pr21038a and pr21038b.
README for LD
This is the GNU linker. It is distributed with other "binary
utilities" which should be in ../binutils. See ../binutils/README for
more general notes, including where to send bug reports.
There are many features of the linker:
* The linker uses a Binary File Descriptor library (../bfd)
that it uses to read and write object files. This helps
insulate the linker itself from the format of object files.
* The linker supports a number of different object file
formats. It can even handle multiple formats at once:
Read two input formats and write a third.
* The linker can be configured for cross-linking.
* The linker supports a control language.
* There is a user manual (ld.texinfo), as well as the
beginnings of an internals manual (ldint.texinfo).
Installation
============
See ../binutils/README.
If you want to make a cross-linker, you may want to specify
a different search path of -lfoo libraries than the default.
You can do this by setting the LIB_PATH variable in ./Makefile
or using the --with-lib-path configure switch.
To build just the linker, make the target all-ld from the top level
directory (one directory above this one).
Porting to a new target
=======================
See the ldint.texinfo manual.
Reporting bugs etc
===========================
See ../binutils/README.
Known problems
==============
The Solaris linker normally exports all dynamic symbols from an
executable. The GNU linker does not do this by default. This is
because the GNU linker tries to present the same interface for all
similar targets (in this case, all native ELF targets). This does not
matter for normal programs, but it can make a difference for programs
which try to dlopen an executable, such as PERL or Tcl. You can make
the GNU linker export all dynamic symbols with the -E or
--export-dynamic command line option.
HP/UX 9.01 has a shell bug that causes the linker scripts to be
generated incorrectly. The symptom of this appears to be "fatal error
- scanner input buffer overflow" error messages. There are various
workarounds to this:
* Build and install bash, and build with "make SHELL=bash".
* Update to a version of HP/UX with a working shell (e.g., 9.05).
* Replace "(. ${srcdir}/scripttempl/${SCRIPT_NAME}.sc)" in
genscripts.sh with "sh ${srcdir}..." (no parens) and make sure the
emulparams script used exports any shell variables it sets.
Copyright (C) 2012-2017 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.