https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78875
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Tue Jan 17 22:02:42 2017 New Revision: 244556 URL: https://gcc.gnu.org/viewcvs?rev=244556&root=gcc&view=rev Log: -mstack-protector-guard and friends (PR78875) Currently, on PowerPC, code compiled with -fstack-protector will load the canary from -0x7010(13) (for -m64) or from -0x7008(2) (for -m32) if GCC was compiled against GNU libc 2.4 or newer or some other libc that supports -fstack-protector, and from the global variable __stack_chk_guard otherwise. This does not work well for Linux and other OS kernels and similar. For such non-standard applications, this patch creates a few new command-line options. The relevant new use cases are: -mstack-protector-guard=global Use the __stack_chk_guard variable, no matter how this GCC was configured. -mstack-protector-guard=tls Use the canary from TLS. This will error out if this GCC was built with a C library that does not support it. -mstack-protector-guard=tls -mstack-protector-register=<reg> -mstack-protector-offset=<offset> Load the canary from offset <off> from base register <reg>. PR target/78875 * config/rs6000/rs6000-opts.h (stack_protector_guard): New enum. * config/rs6000/rs6000.c (rs6000_option_override_internal): Handle the new options. * config/rs6000/rs6000.md (stack_protect_set): Handle the new more flexible settings. (stack_protect_test): Ditto. * config/rs6000/rs6000.opt (mstack-protector-guard=, mstack-protector-guard-reg=, mstack-protector-guard-offset=): New options. * doc/invoke.texi (Option Summary) [RS/6000 and PowerPC Options]: Add -mstack-protector-guard=, -mstack-protector-guard-reg=, and -mstack-protector-guard-offset=. (RS/6000 and PowerPC Options): Ditto. gcc/testsuite/ * gcc.target/powerpc/ssp-1.c: New testcase. * gcc.target/powerpc/ssp-2.c: New testcase. Modified: trunk/gcc/ChangeLog trunk/gcc/config/rs6000/rs6000-opts.h trunk/gcc/config/rs6000/rs6000.c trunk/gcc/config/rs6000/rs6000.md trunk/gcc/config/rs6000/rs6000.opt trunk/gcc/doc/invoke.texi trunk/gcc/testsuite/ChangeLog
