c.opt (fchkp-use-wrappers): New.

	* c-family/c.opt (fchkp-use-wrappers): New.
	* ipa-chkp.c (CHKP_WRAPPER_SYMBOL_PREFIX): New.
	(chkp_wrap_function): New.
	(chkp_build_instrumented_fndecl): Support wrapped
	functions.
	* doc/invoke.texi (-fcheck-pointer-bounds): New.
	(-fchkp-check-incomplete-type): New.
	(-fchkp-first-field-has-own-bounds): New.
	(-fchkp-narrow-bounds): New.
	(-fchkp-narrow-to-innermost-array): New.
	(-fchkp-optimize): New.
	(-fchkp-use-fast-string-functions): New.
	(-fchkp-use-nochk-string-functions): New.
	(-fchkp-use-static-bounds): New.
	(-fchkp-use-static-const-bounds): New.
	(-fchkp-treat-zero-dynamic-size-as-infinite): New.
	(-fchkp-check-read): New.
	(-fchkp-check-write): New.
	(-fchkp-store-bounds): New.
	(-fchkp-instrument-calls): New.
	(-fchkp-instrument-marked-only): New.
	(-fchkp-use-wrappers): New.
	(-static-libmpx): New.
	(-static-libmpxwrappers): New.

From-SVN: r221314

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 911c2ce7eee30075fb82bba76f8be32ae8d3b85c..422465646e1bef3895310ab7117aa07772e95c28 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,30 @@
+2015-03-10  Ilya Enkovich  <ilya.enkovich@intel.com>
+
+       * c-family/c.opt (fchkp-use-wrappers): New.
+       * ipa-chkp.c (CHKP_WRAPPER_SYMBOL_PREFIX): New.
+       (chkp_wrap_function): New.
+       (chkp_build_instrumented_fndecl): Support wrapped
+       functions.
+       * doc/invoke.texi (-fcheck-pointer-bounds): New.
+       (-fchkp-check-incomplete-type): New.
+       (-fchkp-first-field-has-own-bounds): New.
+       (-fchkp-narrow-bounds): New.
+       (-fchkp-narrow-to-innermost-array): New.
+       (-fchkp-optimize): New.
+       (-fchkp-use-fast-string-functions): New.
+       (-fchkp-use-nochk-string-functions): New.
+       (-fchkp-use-static-bounds): New.
+       (-fchkp-use-static-const-bounds): New.
+       (-fchkp-treat-zero-dynamic-size-as-infinite): New.
+       (-fchkp-check-read): New.
+       (-fchkp-check-write): New.
+       (-fchkp-store-bounds): New.
+       (-fchkp-instrument-calls): New.
+       (-fchkp-instrument-marked-only): New.
+       (-fchkp-use-wrappers): New.
+       (-static-libmpx): New.
+       (-static-libmpxwrappers): New.
+
 2015-03-10  Ilya Enkovich  <ilya.enkovich@intel.com>
 
        * config/i386/linux-common.h (LIBMPX_WRAPPERSSPEC): New.

diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 5354500977ad415e6a82eb7cff982652c04fa83f..2692fb50851922d2c613d750b3f2f1b2602c6b28 100644 (file)
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -1041,6 +1041,10 @@ fchkp-instrument-marked-only
 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
 Instrument only functions marked with bnd_instrument attribute.
 
+fchkp-use-wrappers
+C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_wrappers) Init(1)
+Transform instrumented builtin calls into calls to wrappers.
+
 static-libmpx
 Driver
 

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 67814d40d5fd8f33cbc96a04ef519ad832e3de0c..b18669cce8d86282c5d850d2ab37648e6808f8cf 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -302,6 +302,15 @@ Objective-C and Objective-C++ Dialects}.
 @gccoptlist{-d@var{letters}  -dumpspecs  -dumpmachine  -dumpversion @gol
 -fsanitize=@var{style} -fsanitize-recover -fsanitize-recover=@var{style} @gol
 -fasan-shadow-offset=@var{number} -fsanitize-undefined-trap-on-error @gol
+-fcheck-pointer-bounds -fchkp-check-incomplete-type @gol
+-fchkp-first-field-has-own-bounds -fchkp-narrow-bounds @gol
+-fchkp-narrow-to-innermost-array -fchkp-optimize @gol
+-fchkp-use-fast-string-functions -fchkp-use-nochk-string-functions @gol
+-fchkp-use-static-bounds -fchkp-use-static-const-bounds @gol
+-fchkp-treat-zero-dynamic-size-as-infinite -fchkp-check-read @gol
+-fchkp-check-read -fchkp-check-write -fchkp-store-bounds @gol
+-fchkp-instrument-calls -fchkp-instrument-marked-only @gol
+-fchkp-use-wrappers @gol
 -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
 -fdisable-ipa-@var{pass_name} @gol
 -fdisable-rtl-@var{pass_name} @gol
@@ -477,6 +486,7 @@ Objective-C and Objective-C++ Dialects}.
 -nostartfiles  -nodefaultlibs  -nostdlib -pie -rdynamic @gol
 -s  -static -static-libgcc -static-libstdc++ @gol
 -static-libasan -static-libtsan -static-liblsan -static-libubsan @gol
+-static-libmpx -static-libmpxwrappers @gol
 -shared -shared-libgcc  -symbolic @gol
 -T @var{script}  -Wl,@var{option}  -Xlinker @var{option} @gol
 -u @var{symbol} -z @var{keyword}}
@@ -5827,6 +5837,135 @@ a @code{libubsan} library routine.  The advantage of this is that the
 @code{libubsan} library is not needed and is not linked in, so this
 is usable even in freestanding environments.
 
+@item -fcheck-pointer-bounds
+@opindex fcheck-pointer-bounds
+@opindex fno-check-pointer-bounds
+Enable Pointer Bounds Checker instrumentation.  Each memory reference
+is instrumented with checks of pointer used for memory access against
+bounds associated with that pointer.  Generated instrumentation may
+be controlled by various @option{-fchkp-*} options.  Currently there
+is only Intel MPX based implementation available, thus i386 target
+and @option{-mmpx} are required.  MPX based instrumentation requires
+a runtime library to enable MPX in a hardware and handle bounds
+violation signals.  By default when @option{-fcheck-pointer-bounds}
+and @option{-mmpx} options are used to link a program, the GCC driver
+links against @option{libmpx} runtime library.  MPX based instrumentation
+may be used for a debugging and also it may be included into a release
+version to increase program security.  Depending on usage you may
+put different requirements to runtime library.  Current version
+ of MPX runtime library is more oriented to be used as a debugging
+tool.  MPX runtime library usage implies @option{-lpthread}.  See
+also @option{-static-libmpx}.  The runtime library  behavior can be
+influenced using various @env{CHKP_RT_*} environment variables.  See
+@uref{https://gcc.gnu.org/wiki/Intel%20MPX%20support%20in%20the%20GCC%20compiler}
+for more details.
+
+@item -fchkp-check-incomplete-type
+@opindex fchkp-check-incomplete-type
+@opindex fno-chkp-check-incomplete-type
+Generate pointer bounds checks for variables with incomplete type.
+Enabled by default
+
+@item -fchkp-narrow-bounds
+@opindex fchkp-narrow-bounds
+@opindex fno-chkp-narrow-bounds
+Controls bounds used by Pointer Bounds Checker for pointers to object
+fields.  If narrowing is enabled then field bounds are used.  Otherwise
+object bounds are used.  See also @option{-fchkp-narrow-to-innermost-array}
+and @option{-fchkp-first-field-has-own-bounds}.  Enabled by default.
+
+@item -fchkp-first-field-has-own-bounds
+@opindex fchkp-first-field-has-own-bounds
+@opindex fno-chkp-first-field-has-own-bounds
+Forces Pointer Bounds Checker to use narrowed bounds for address of the
+first field in the structure.  By default pointer to the first field has
+the same bounds as pointer to the whole structure.
+
+@item -fchkp-narrow-to-innermost-array
+@opindex fchkp-narrow-to-innermost-array
+@opindex fno-chkp-narrow-to-innermost-array
+Forces Pointer Bounds Checker to use bounds of the innermost arrays in
+case of nested static arryas access.  By default it is disabled and
+bounds of the outermost array are used.
+
+@item -fchkp-optimize
+@opindex fchkp-optimize
+@opindex fno-chkp-optimize
+Enables Pointer Bounds Checker optimizations.  Enabled by default at
+optimization levels @option{-O}, @option{-O2}, @option{-O3}.
+
+@item -fchkp-use-fast-string-functions
+@opindex fchkp-use-fast-string-functions
+@opindex fno-chkp-use-fast-string-functions
+Allow to use @code{*_nobnd} versions of string functions (not copying bounds)
+by Pointer Bounds Checker.  Disabled by default.
+
+@item -fchkp-use-nochk-string-functions
+@opindex fchkp-use-nochk-string-functions
+@opindex fno-chkp-use-nochk-string-functions
+Allow to use @code{*_nochk} versions of string functions (not checking bounds)
+by Pointer Bounds Checker.  Disabled by default.
+
+@item -fchkp-use-static-bounds
+@opindex fchkp-use-static-bounds
+@opindex fno-chkp-use-static-bounds
+Allow Pointer Bounds Checker to generate static bounds holding
+bounds of static variables.  Enabled by default.
+
+@item -fchkp-use-static-const-bounds
+@opindex fchkp-use-static-const-bounds
+@opindex fno-chkp-use-static-const-bounds
+Use statically initialized bounds for constant bounds instead of
+generating them each time it is required.  By default enabled when
+@option{-fchkp-use-static-bounds} is enabled.
+
+@item -fchkp-treat-zero-dynamic-size-as-infinite
+@opindex fchkp-treat-zero-dynamic-size-as-infinite
+@opindex fno-chkp-treat-zero-dynamic-size-as-infinite
+With this option zero size obtained dynamically for objects with
+incomplete type will be treated as infinite by Pointer Bounds
+Checker.  It may be helpful if program is linked with a library
+missing size information for some symbols.  Disabled by default.
+
+@item -fchkp-check-read
+@opindex fchkp-check-read
+@opindex fno-chkp-check-read
+Instructs Pointer Bounds Checker to generate checks for all read
+accesses to memory.  Enabled by default.
+
+@item -fchkp-check-write
+@opindex fchkp-check-write
+@opindex fno-chkp-check-write
+Instructs Pointer Bounds Checker to generate checks for all write
+accesses to memory.  Enabled by default.
+
+@item -fchkp-store-bounds
+@opindex fchkp-store-bounds
+@opindex fno-chkp-store-bounds
+Instructs Pointer Bounds Checker to generate bounds stores for
+pointer writes.  Enabled by default.
+
+@item -fchkp-instrument-calls
+@opindex fchkp-instrument-calls
+@opindex fno-chkp-instrument-calls
+Instructs Pointer Bounds Checker to pass pointer bounds to calls.
+Enabled by default.
+
+@item -fchkp-instrument-marked-only
+@opindex fchkp-instrument-marked-only
+@opindex fno-chkp-instrument-marked-only
+Instructs Pointer Bounds Checker to instrument only functions
+marked with @code{bnd_instrument} attribute.  Disabled by default.
+
+@item -fchkp-use-wrappers
+@opindex fchkp-use-wrappers
+@opindex fno-chkp-use-wrappers
+Allows Pointer Bounds Checker to replace calls to built-in function
+with calls to wrapper functions.  When the @option{-fchkp-use-wrappers}
+is used to link a program, the GCC driver automatically links
+agains @option{libmpxwrappers}.  See also @option{-static-libmpxwrappers}.
+Enabled by default.
+
 @item -fdump-final-insns@r{[}=@var{file}@r{]}
 @opindex fdump-final-insns
 Dump the final internal representation (RTL) to @var{file}.  If the
@@ -11136,6 +11275,27 @@ option is not used, then this links against the shared version of
 driver to link @file{libubsan} statically, without necessarily linking
 other libraries statically.
 
+@item -static-libmpx
+@opindex static-libmpx
+When @option{-fcheck-pointer bounds} and @option{-mmpx} options are
+used to link a program, the GCC driver automatically links against
+@option{libmpx}.  If @file{libmpx} is available as a shared library,
+and the @option{-static} option is not used, then this links against
+the shared version of @file{libmpx}.  The @option{-static-libmpx}
+option directs the GCC driver to link @file{libmpx} statically,
+without necessarily linking other libraries statically.
+
+@item -static-libmpxwrappers
+@opindex static-libmpxwrappers
+When @option{-fcheck-pointer bounds}, @option{-mmpx} options are used and
+@option{-fno-chkp-use-wrappers} option is not used to link a program, the
+GCC driver automatically links against @option{libmpxwrappers}.  If
+@file{libmpxwrappers} is available as a shared library, and the
+@option{-static} option is not used, then this links against the shared
+version of @file{libmpxwrappers}.  The @option{-static-libmpxwrappers}
+option directs the GCC driver to link @file{libmpxwrappers} statically,
+without necessarily linking other libraries statically.
+
 @item -static-libstdc++
 @opindex static-libstdc++
 When the @command{g++} program is used to link a C++ program, it

diff --git a/gcc/ipa-chkp.c b/gcc/ipa-chkp.c
index 0b857ffb8a05098f0a5b54329981fea96fcdff1b..3bea06ab75087e7b630744eb51af8da57680f360 100644 (file)
--- a/gcc/ipa-chkp.c
+++ b/gcc/ipa-chkp.c
@@ -100,6 +100,44 @@ along with GCC; see the file COPYING3.  If not see
     removed.  */
 
 #define CHKP_BOUNDS_OF_SYMBOL_PREFIX "__chkp_bounds_of_"
+#define CHKP_WRAPPER_SYMBOL_PREFIX "__mpx_wrapper_"
+
+/* Return 1 calls to FNDECL should be replaced with
+   a call to wrapper function.  */
+static bool
+chkp_wrap_function (tree fndecl)
+{
+  if (!flag_chkp_use_wrappers)
+    return false;
+
+  if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL)
+    {
+      switch (DECL_FUNCTION_CODE (fndecl))
+       {
+       case BUILT_IN_STRLEN:
+       case BUILT_IN_STRCPY:
+       case BUILT_IN_STRNCPY:
+       case BUILT_IN_STPCPY:
+       case BUILT_IN_STPNCPY:
+       case BUILT_IN_STRCAT:
+       case BUILT_IN_STRNCAT:
+       case BUILT_IN_MEMCPY:
+       case BUILT_IN_MEMPCPY:
+       case BUILT_IN_MEMSET:
+       case BUILT_IN_MEMMOVE:
+       case BUILT_IN_BZERO:
+       case BUILT_IN_MALLOC:
+       case BUILT_IN_CALLOC:
+       case BUILT_IN_REALLOC:
+         return 1;
+
+       default:
+         return 0;
+       }
+    }
+
+  return false;
+}
 
 /* Build a clone of FNDECL with a modified name.  */
 
@@ -124,11 +162,20 @@ chkp_build_instrumented_fndecl (tree fndecl)
      because it conflicts with decl merging algorithms in LTO.
      Achieve the result by using transparent alias name for the
      instrumented version.  */
-  s = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));
-  s += ".chkp";
-  new_name = get_identifier (s.c_str ());
-  IDENTIFIER_TRANSPARENT_ALIAS (new_name) = 1;
-  TREE_CHAIN (new_name) = DECL_ASSEMBLER_NAME (fndecl);
+  if (chkp_wrap_function(fndecl))
+    {
+      s = CHKP_WRAPPER_SYMBOL_PREFIX;
+      s += IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));
+      new_name = get_identifier (s.c_str ());
+    }
+  else
+    {
+      s = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));
+      s += ".chkp";
+      new_name = get_identifier (s.c_str ());
+      IDENTIFIER_TRANSPARENT_ALIAS (new_name) = 1;
+      TREE_CHAIN (new_name) = DECL_ASSEMBLER_NAME (fndecl);
+    }
   SET_DECL_ASSEMBLER_NAME (new_decl, new_name);
 
   /* For functions with body versioning will make a copy of arguments.