Binutils with MCST patches
40eadf04ff
GDB is not able to execute "step" command on function calls of Armv8-M cmse secure entry functions. Everytime GNU linker come across definition of any cmse secure entry function in object file(s), it creates two new instructions secure gateway (sg) and original branch destination (b.w), place those two instructions in ".gnu.sgstubs" section of executable. Any function calls to these cmse secure entry functions is re-directed through secure gateway (sg) present in ".gnu.sgstubs" section. Example: Following is a function call to cmse secure entry function "foo": ... bl xxxx <foo> --->(a) ... <foo> xxxx: push {r7, lr} GNU linker on finding out "foo" is a cmse secure entry function, created sg and b.w instructions and place them in ".gnu.sgstubs" section (marked by c). The "bl" instruction (marked by a) which is a call to cmse secure entry function is modified by GNU linker (as marked by b) and call flow is re-directly through secure gateway (sg) in ".gnu.sgstubs" section. ... bl yyyy <foo> ---> (b) ... section .gnu.sgstubs: ---> (c) yyyy <foo> yyyy: sg // secure gateway b.w xxxx <__acle_se_foo> // original_branch_dest ... 0000xxxx <__acle_se_foo> xxxx: push {r7, lr} ---> (d) On invoking GDB, when the control is at "b" and we pass "step" command, the pc returns "yyyy" (sg address) which is a trampoline and which does not exist in source code. So GDB jumps to next line without jumping to "__acle_se_foo" (marked by d). The above details are published on the Arm website [1], please refer to section 5.4 (Entry functions) and section 3.4.4 (C level development flow of secure code). [1] https://developer.arm.com/architectures/cpu-architecture/m-profile/docs/ecm0359818/latest/armv8-m-security-extensions-requirements-on-development-tools-engineering-specification This patch fixes above problem by returning target pc "xxxx" to GDB on executing "step" command at "b", so that the control jumps to "__acle_se_foo" (marked by d). gdb/ChangeLog: * arm-tdep.c (arm_skip_cmse_entry): New function. (arm_is_sgstubs_section): New function. (arm_skip_stub): Add call to arm_skip_cmse_entry function. gdb/testsuite/ChangeLog: * gdb.arch/arm-cmse-sgstubs.c: New test. * gdb.arch/arm-cmse-sgstubs.exp: New file. |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gnulib | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
libctf | ||
libdecnumber | ||
libiberty | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.gitattributes | ||
.gitignore | ||
ar-lib | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING3 | ||
COPYING3.LIB | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
lt~obsolete.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
multilib.am | ||
README | ||
README-maintainer-mode | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
test-driver | ||
ylwrap |
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.