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The host syscall callback mechanism should take care of updating the errcode within the CB_SYSCALL struct, and we should not be adjusting the error code once the syscall has completed. We especially, should not be rewriting the syscall errcode based on the value of errno some time after running the host syscall, as there is no guarantee that errno has not be overwritten. To perform a syscall we call cb_syscall (in syscall.c). To return from cb_syscall control passes through one of two exit paths these are labeled FinishSyscall and ErrorFinish and are reached using goto statements scattered throughout the cb_syscall function. In FinishSyscall we store the syscall result in 'sc->result', and the error code is transated to target encoding, and stored in 'sc->errcode'. In ErrorFinish, we again store the syscall result in 'sc->result', and fill in 'sc->errcode' by fetching the actual errno from the host with the 'cb->get_errno' callback. In both cases 'sc->errcode' will have been filled in with an appropriate value. Further, if we look at a specific syscall example, CB_SYS_open, in this case the first thing we do is fetch the path to open from the target with 'get_path', if this fails then the errcode is returned, and we jump to FinishSyscall. Notice that in this case, no host syscall may have been performed, for example a failure to read the path to open out of simulated memory can return EINVAL without performing any host syscall. Given that no host syscall has been performed, reading the host errno makes absolutely no sense. This commit removes from sim_syscall_multi the rewriting of sc->errcode based on the value of errno, and instead relies on the value stored in the cb_syscall. sim/common/ChangeLog: * sim-syscall.c (sim_syscall_multi): Don't update sc->errcode at this point, it should have already been set in cb_syscall. |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
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.