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| author | Uros Bizjak <ubizjak@gmail.com> | 2017-08-10 22:59:10 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2017-08-10 22:59:10 +0200 |
| commit | e1769bdd4cef522ada32aec863feba41116b183a (patch) | |
| tree | bfa44ea06ab428cb984cd7189bf283a48a7726bf /gcc/doc/invoke.texi | |
| parent | f18f68226c2abb77008da7bd0aef5d7ee905c4c6 (diff) | |
| download | gcc-e1769bdd4cef522ada32aec863feba41116b183a.zip gcc-e1769bdd4cef522ada32aec863feba41116b183a.tar.gz gcc-e1769bdd4cef522ada32aec863feba41116b183a.tar.bz2 | |
re PR target/81708 (The x86 stack canary location should be customizable)
PR target/81708
* config/i386/i386.opt (mstack-protector-guard-symbol=): New option
* config/i386/i386.c (ix86_stack_protect_guard): Use
ix86_stack_protect_guard_symbol_str to generate varible declaration.
* doc/invoke.texi (x86 Options): Document
-mstack-protector-guard-symbol= option.
testsuite/ChangeLog:
PR target/81708
* gcc.target/i386/stack-prot-sym.c: New test.
From-SVN: r251040
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 3753d8a..ec29f1d 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1216,7 +1216,8 @@ See RS/6000 and PowerPC Options. -mavx256-split-unaligned-load -mavx256-split-unaligned-store @gol -malign-data=@var{type} -mstack-protector-guard=@var{guard} @gol -mstack-protector-guard-reg=@var{reg} @gol --mstack-protector-guard-offset=@var{offset} -mmitigate-rop @gol +-mstack-protector-guard-offset=@var{offset} @gol +-mstack-protector-guard-symbol=@var{symbol} -mmitigate-rop @gol -mgeneral-regs-only -mcall-ms2sysv-xlogues} @emph{x86 Windows Options} @@ -22757,9 +22758,11 @@ The @option{-mno-compat-align-parm} option is the default. @item -mstack-protector-guard=@var{guard} @itemx -mstack-protector-guard-reg=@var{reg} @itemx -mstack-protector-guard-offset=@var{offset} +@itemx -mstack-protector-guard-symbol=@var{symbol} @opindex mstack-protector-guard @opindex mstack-protector-guard-reg @opindex mstack-protector-guard-offset +@opindex mstack-protector-guard-symbol Generate stack protection code using canary at @var{guard}. Supported locations are @samp{global} for global canary or @samp{tls} for per-thread canary in the TLS block (the default with GNU libc version 2.4 or later). @@ -22769,7 +22772,8 @@ With the latter choice the options @option{-mstack-protector-guard-offset=@var{offset}} furthermore specify which register to use as base register for reading the canary, and from what offset from that base register. The default for those is as specified in the -relevant ABI. +relevant ABI. @option{-mstack-protector-guard-symbol=@var{symbol}} overrides +the offset with a symbol reference to a canary in the TLS block. @end table @node RX Options |