https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85379

--- Comment #1 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 15:22:27 2018
New Revision: 259497

URL: https://gcc.gnu.org/viewcvs?rev=259497&root=gcc&view=rev
Log:
libgcc/CET: Add _CET_ENDBR to __stack_split_initialize

Program received signal SIGSEGV, Segmentation fault.
__stack_split_initialize ()
    at /export/gnu/import/git/sources/gcc/libgcc/config/i386/morestack.S:751
751             leaq    -16000(%rsp),%rax       # We should have at least 16K.
Missing separate debuginfos, use: dnf debuginfo-install
libgcc-8.0.1-0.21.0.fc28.x86_64
(gdb) disass
Dump of assembler code for function __stack_split_initialize:
=> 0x0000000000402858 <+0>:     lea    -0x3e80(%rsp),%rax
   0x0000000000402860 <+8>:     mov    %rax,%fs:0x70
   0x0000000000402869 <+17>:    sub    $0x8,%rsp
   0x000000000040286d <+21>:    mov    %rsp,%rdi
   0x0000000000402870 <+24>:    mov    $0x3e80,%esi
   0x0000000000402875 <+29>:    callq  0x401810
<__generic_morestack_set_initial_sp>
   0x000000000040287a <+34>:    add    $0x8,%rsp
   0x000000000040287e <+38>:    retq
End of assembler dump.
(gdb)

This patch adds the missing ENDBR to __stack_split_initialize.

        PR libgcc/85379
        * config/i386/morestack.S (__stack_split_initialize): Add
        _CET_ENDBR.

Modified:
    trunk/libgcc/ChangeLog
    trunk/libgcc/config/i386/morestack.S

Reply via email to