Targets may have various requirements on the required location of the jump pad area. Currently IPA allocates it at the lowest possible address, so that it is reachable by branches from the executable. However, this fails on powerpc, which has executable link address (0x10000000) much larger than branch reach (+/- 32MiB). This makes jump pad buffer allocation a target hook instead. The current implementations are as follows: - i386 and s390: Branches can reach anywhere, so just mmap it. This avoids the linear search dance. - x86_64: Branches have +/-2GiB of reach, and executable is loaded low, so just call mmap with MAP_32BIT. Likewise avoids the linear search. - aarch64: Branches have +-128MiB of reach, executable loaded at 4MiB. Do a linear search from 4MiB-size downwards to page_size. - s390x: Branches have +-4GiB of reach, executable loaded at 2GiB. Do like on aarch64. gdb/gdbserver/ChangeLog: * linux-aarch64-ipa.c: Add <sys/mman.h> and <sys/auxv.h> includes. (alloc_jump_pad_buffer): New function. * linux-amd64-ipa.c: Add <sys/mman.h> include. (alloc_jump_pad_buffer): New function. * linux-i386-ipa.c (alloc_jump_pad_buffer): New function. * linux-s390-ipa.c: Add <sys/mman.h> and <sys/auxv.h> includes. (alloc_jump_pad_buffer): New function. * tracepoint.c (getauxval) [!HAVE_GETAUXVAL]: New function. (initialize_tracepoint): Delegate to alloc_jump_pad_buffer. * tracepoint.h (alloc_jump_pad_buffer): New prototype. (getauxval) [!HAVE_GETAUXVAL]: New prototype. |
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bfd | ||
binutils | ||
config | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
libdecnumber | ||
libiberty | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.gitattributes | ||
.gitignore | ||
COPYING | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
COPYING3 | ||
COPYING3.LIB | ||
ChangeLog | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
README | ||
README-maintainer-mode | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
lt~obsolete.m4 | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
ylwrap |
README
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.