invoke.texi (-fcheck-pointer-bounds): Copy-edit, add additional index entries and cross-references.
2015-03-21 Sandra Loosemore <sandra@codesourcery.com> gcc/ * doc/invoke.texi (-fcheck-pointer-bounds): Copy-edit, add additional index entries and cross-references. (-fchkp-check-incomplete-type): Likewise. (-fchkp-first-field-has-own-bounds): Likewise. (-fchkp-narrow-to-innermost-array): Likewise. (-fchkp-use-fast-string-functions): Likewise. (-fchkp-use-nochk-string-functions): Likewise. (-fchkp-use-static-const-bounds): Likewise. (-fchkp-treat-zero-dynamic-size-as-infinite): Likewise. (-fchkp-instrument-marked-only): Likewise. (-fchkp-use-wrappers): Likewise. (-static-libmpx): Likewise. (-static-libmpxwrappers): Likewise. * doc/extend.texi (bnd_legacy): Likewise. (bnd_instrument): Likewise. (bnd_variable_size): Likewise. (Pointer Bounds Checker builtins): Likewise. From-SVN: r221558
This commit is contained in:
Sandra Loosemore
Sandra Loosemore
parent
844d9a76bc
commit
7651042ec6
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@ -1,3 +1,23 @@
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2015-03-21 Sandra Loosemore <sandra@codesourcery.com>
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* doc/invoke.texi (-fcheck-pointer-bounds): Copy-edit, add
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additional index entries and cross-references.
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(-fchkp-check-incomplete-type): Likewise.
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(-fchkp-first-field-has-own-bounds): Likewise.
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(-fchkp-narrow-to-innermost-array): Likewise.
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(-fchkp-use-fast-string-functions): Likewise.
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(-fchkp-use-nochk-string-functions): Likewise.
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(-fchkp-use-static-const-bounds): Likewise.
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(-fchkp-treat-zero-dynamic-size-as-infinite): Likewise.
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(-fchkp-instrument-marked-only): Likewise.
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(-fchkp-use-wrappers): Likewise.
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(-static-libmpx): Likewise.
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(-static-libmpxwrappers): Likewise.
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* doc/extend.texi (bnd_legacy): Likewise.
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(bnd_instrument): Likewise.
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(bnd_variable_size): Likewise.
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(Pointer Bounds Checker builtins): Likewise.
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2015-03-21 Tom de Vries <tom@codesourcery.com>
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PR tree-optimization/65458
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@ -3688,15 +3688,16 @@ in the function when compiling with the @option{-fsanitize=undefined} option.
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@item bnd_legacy
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@cindex @code{bnd_legacy} function attribute
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The @code{bnd_legacy} attribute on functions is used to inform
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compiler that function should not be instrumented when compiled
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with @option{-fcheck-pointer-bounds} option.
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@cindex Pointer Bounds Checker attributes
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The @code{bnd_legacy} attribute on functions is used to inform the
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compiler that the function should not be instrumented when compiled
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with the @option{-fcheck-pointer-bounds} option.
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@item bnd_instrument
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@cindex @code{bnd_instrument} function attribute
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The @code{bnd_instrument} attribute on functions is used to inform
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compiler that function should be instrumented when compiled
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with @option{-fchkp-instrument-marked-only} option.
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The @code{bnd_instrument} attribute on functions is used to inform the
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compiler that the function should be instrumented when compiled
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with the @option{-fchkp-instrument-marked-only} option.
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@item regparm (@var{number})
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@cindex @code{regparm} attribute
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@ -5943,10 +5944,12 @@ GCC emits warnings based on this attribute by default; use
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@option{-Wno-designated-init} to suppress them.
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@item bnd_variable_size
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@cindex @code{bnd_variable_size} attribute
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@cindex Pointer Bounds Checker attributes
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When applied to a structure field, this attribute tells Pointer
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Bounds Checker that the size of this field should not be computed
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using static type information. It may be used to mark variable
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sized static array fields placed at the end of a structure.
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using static type information. It may be used to mark variably-sized
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static array fields placed at the end of a structure.
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@smallexample
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struct S
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@ -5958,8 +5961,9 @@ S *p = (S *)malloc (sizeof(S) + 100);
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p->data[10] = 0; //Bounds violation
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@end smallexample
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By using an attribute for a field we may avoid bound violation
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we most probably do not want to see:
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@noindent
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By using an attribute for the field we may avoid unwanted bound
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violation checks:
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@smallexample
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struct S
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@ -8731,6 +8735,7 @@ is called and the @var{flag} argument passed to it.
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@node Pointer Bounds Checker builtins
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@section Pointer Bounds Checker Built-in Functions
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@cindex Pointer Bounds Checker builtins
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@findex __builtin___bnd_set_ptr_bounds
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@findex __builtin___bnd_narrow_ptr_bounds
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@findex __builtin___bnd_copy_ptr_bounds
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@ -8744,15 +8749,16 @@ is called and the @var{flag} argument passed to it.
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@findex __builtin___bnd_get_ptr_ubound
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GCC provides a set of built-in functions to control Pointer Bounds Checker
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instrumentation. Note that all Pointer Bounds Checker builtins are allowed
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to use even if you compile with Pointer Bounds Checker off. The builtins
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behavior may differ in such case as documented below.
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instrumentation. Note that all Pointer Bounds Checker builtins can be used
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even if you compile with Pointer Bounds Checker off
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(@option{-fno-check-pointer-bounds}).
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The behavior may differ in such case as documented below.
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@deftypefn {Built-in Function} void * __builtin___bnd_set_ptr_bounds (const void * @var{q}, size_t @var{size})
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@deftypefn {Built-in Function} {void *} __builtin___bnd_set_ptr_bounds (const void *@var{q}, size_t @var{size})
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This built-in function returns a new pointer with the value of @var{q}, and
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associate it with the bounds [@var{q}, @var{q}+@var{size}-1]. With Pointer
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Bounds Checker off built-in function just returns the first argument.
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Bounds Checker off, the built-in function just returns the first argument.
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@smallexample
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extern void *__wrap_malloc (size_t n)
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@ -8765,72 +8771,75 @@ extern void *__wrap_malloc (size_t n)
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_narrow_ptr_bounds (const void * @var{p}, const void * @var{q}, size_t @var{size})
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@deftypefn {Built-in Function} {void *} __builtin___bnd_narrow_ptr_bounds (const void *@var{p}, const void *@var{q}, size_t @var{size})
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This built-in function returns a new pointer with the value of @var{p}
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and associate it with the narrowed bounds formed by the intersection
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of bounds associated with @var{q} and the [@var{p}, @var{p} + @var{size} - 1].
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With Pointer Bounds Checker off built-in function just returns the first
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and associates it with the narrowed bounds formed by the intersection
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of bounds associated with @var{q} and the bounds
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[@var{p}, @var{p} + @var{size} - 1].
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With Pointer Bounds Checker off, the built-in function just returns the first
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argument.
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@smallexample
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void init_objects (object *objs, size_t size)
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@{
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size_t i;
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/* Initialize objects one-by-one passing pointers with bounds of an object,
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not the full array of objects. */
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/* Initialize objects one-by-one passing pointers with bounds of
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an object, not the full array of objects. */
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for (i = 0; i < size; i++)
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init_object (__builtin___bnd_narrow_ptr_bounds (objs + i, objs, sizeof(object)));
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init_object (__builtin___bnd_narrow_ptr_bounds (objs + i, objs,
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sizeof(object)));
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@}
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@end smallexample
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_copy_ptr_bounds (const void * @var{q}, const void * @var{r})
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@deftypefn {Built-in Function} {void *} __builtin___bnd_copy_ptr_bounds (const void *@var{q}, const void *@var{r})
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This built-in function returns a new pointer with the value of @var{q},
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and associate it with the bounds already associated with pointer @var{r}.
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With Pointer Bounds Checker off built-in function just returns the first
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and associates it with the bounds already associated with pointer @var{r}.
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With Pointer Bounds Checker off, the built-in function just returns the first
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argument.
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@smallexample
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/* Here is a way to get pointer to object's field but
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still with the full object's bounds. */
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int *field_ptr = __builtin___bnd_copy_ptr_bounds (&objptr->int_filed, objptr);
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int *field_ptr = __builtin___bnd_copy_ptr_bounds (&objptr->int_field,
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objptr);
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@end smallexample
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_init_ptr_bounds (const void * @var{q})
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@deftypefn {Built-in Function} {void *} __builtin___bnd_init_ptr_bounds (const void *@var{q})
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This built-in function returns a new pointer with the value of @var{q}, and
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associate it with INIT (allowing full memory access) bounds. With Pointer
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Bounds Checker off built-in function just returns the first argument.
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associates it with INIT (allowing full memory access) bounds. With Pointer
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Bounds Checker off, the built-in function just returns the first argument.
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@end deftypefn
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@deftypefn {Built-in Function} void * __builtin___bnd_null_ptr_bounds (const void * @var{q})
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@deftypefn {Built-in Function} {void *} __builtin___bnd_null_ptr_bounds (const void *@var{q})
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This built-in function returns a new pointer with the value of @var{q}, and
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associate it with NULL (allowing no memory access) bounds. With Pointer
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Bounds Checker off built-in function just returns the first argument.
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associates it with NULL (allowing no memory access) bounds. With Pointer
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Bounds Checker off, the built-in function just returns the first argument.
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@end deftypefn
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@deftypefn {Built-in Function} void __builtin___bnd_store_ptr_bounds (const void ** @var{ptr_addr}, const void * @var{ptr_val})
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@deftypefn {Built-in Function} void __builtin___bnd_store_ptr_bounds (const void **@var{ptr_addr}, const void *@var{ptr_val})
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This built-in function stores the bounds associated with pointer @var{ptr_val}
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and location @var{ptr_addr} into Bounds Table. This can be useful to propagate
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bounds from legacy code without touching the associated pointer's memory when
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pointers were copied as integers. With Pointer Bounds Checker off built-in
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pointers are copied as integers. With Pointer Bounds Checker off, the built-in
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function call is ignored.
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@end deftypefn
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_lbounds (const void * @var{q})
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_lbounds (const void *@var{q})
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This built-in function checks if the pointer @var{q} is within the lower
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bound of its associated bounds. With Pointer Bounds Checker off built-in
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bound of its associated bounds. With Pointer Bounds Checker off, the built-in
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function call is ignored.
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@smallexample
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@ -8848,19 +8857,19 @@ extern void *__wrap_memset (void *dst, int c, size_t len)
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@end deftypefn
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_ubounds (const void * @var{q})
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_ubounds (const void *@var{q})
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This built-in function checks if the pointer @var{q} is within the upper
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bound of its associated bounds. With Pointer Bounds Checker off built-in
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bound of its associated bounds. With Pointer Bounds Checker off, the built-in
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function call is ignored.
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@end deftypefn
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_bounds (const void * @var{q}, size_t @var{size})
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@deftypefn {Built-in Function} void __builtin___bnd_chk_ptr_bounds (const void *@var{q}, size_t @var{size})
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This built-in function checks if [@var{q}, @var{q} + @var{size} - 1] is within
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the lower and upper bounds associated with @var{q}. With Pointer Bounds Checker
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off built-in function call is ignored.
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off, the built-in function call is ignored.
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@smallexample
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extern void *__wrap_memcpy (void *dst, const void *src, size_t n)
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@ -8877,11 +8886,12 @@ extern void *__wrap_memcpy (void *dst, const void *src, size_t n)
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@end deftypefn
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@deftypefn {Built-in Function} const void * __builtin___bnd_get_ptr_lbound (const void * @var{q})
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@deftypefn {Built-in Function} {const void *} __builtin___bnd_get_ptr_lbound (const void *@var{q})
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This built-in function returns the lower bound (which is a pointer) associated
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with the pointer @var{q}. This is at least useful for debugging using printf.
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With Pointer Bounds Checker off built-in function returns 0.
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This built-in function returns the lower bound associated
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with the pointer @var{q}, as a pointer value.
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This is useful for debugging using @code{printf}.
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With Pointer Bounds Checker off, the built-in function returns 0.
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@smallexample
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void *lb = __builtin___bnd_get_ptr_lbound (q);
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@ -8891,11 +8901,11 @@ printf ("q = %p lb(q) = %p ub(q) = %p", q, lb, ub);
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@end deftypefn
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@deftypefn {Built-in Function} const void * __builtin___bnd_get_ptr_ubound (const void * @var{q})
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@deftypefn {Built-in Function} {const void *} __builtin___bnd_get_ptr_ubound (const void *@var{q})
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This built-in function returns the upper bound (which is a pointer) associated
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with the pointer @var{q}. With Pointer Bounds Checker off built-in function
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returns -1.
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with the pointer @var{q}. With Pointer Bounds Checker off,
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the built-in function returns -1.
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@end deftypefn
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@ -5843,31 +5843,42 @@ is usable even in freestanding environments.
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@item -fcheck-pointer-bounds
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@opindex fcheck-pointer-bounds
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@opindex fno-check-pointer-bounds
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@cindex Pointer Bounds Checker options
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Enable Pointer Bounds Checker instrumentation. Each memory reference
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is instrumented with checks of pointer used for memory access against
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bounds associated with that pointer. Generated instrumentation may
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be controlled by various @option{-fchkp-*} options. Currently there
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is only Intel MPX based implementation available, thus i386 target
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and @option{-mmpx} are required. MPX based instrumentation requires
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a runtime library to enable MPX in a hardware and handle bounds
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is instrumented with checks of the pointer used for memory access against
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bounds associated with that pointer.
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Currently there
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is only an implementation for Intel MPX available, thus x86 target
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and @option{-mmpx} are required to enable this feature.
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MPX-based instrumentation requires
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a runtime library to enable MPX in hardware and handle bounds
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violation signals. By default when @option{-fcheck-pointer-bounds}
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and @option{-mmpx} options are used to link a program, the GCC driver
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links against @option{libmpx} runtime library. MPX based instrumentation
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may be used for a debugging and also it may be included into a release
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version to increase program security. Depending on usage you may
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put different requirements to runtime library. Current version
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of MPX runtime library is more oriented to be used as a debugging
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links against the @file{libmpx} runtime library. MPX-based instrumentation
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may be used for debugging and also may be included in production code
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to increase program security. Depending on usage, you may
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have different requirements for the runtime library. The current version
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of the MPX runtime library is more oriented for use as a debugging
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tool. MPX runtime library usage implies @option{-lpthread}. See
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also @option{-static-libmpx}. The runtime library behavior can be
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influenced using various @env{CHKP_RT_*} environment variables. See
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@uref{https://gcc.gnu.org/wiki/Intel%20MPX%20support%20in%20the%20GCC%20compiler}
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for more details.
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Generated instrumentation may be controlled by various
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@option{-fchkp-*} options and by the @code{bnd_variable_size}
|
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structure field attribute (@pxref{Type Attributes}) and
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@code{bnd_legacy}, and @code{bnd_instrument} function attributes
|
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(@pxref{Function Attributes}). GCC also provides a number of built-in
|
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functions for controlling the Pointer Bounds Checker. @xref{Pointer
|
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Bounds Checker builtins}, for more information.
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@item -fchkp-check-incomplete-type
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@opindex fchkp-check-incomplete-type
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@opindex fno-chkp-check-incomplete-type
|
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Generate pointer bounds checks for variables with incomplete type.
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Enabled by default
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Enabled by default.
|
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|
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@item -fchkp-narrow-bounds
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@opindex fchkp-narrow-bounds
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|
|
@ -5880,15 +5891,15 @@ and @option{-fchkp-first-field-has-own-bounds}. Enabled by default.
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@item -fchkp-first-field-has-own-bounds
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@opindex fchkp-first-field-has-own-bounds
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@opindex fno-chkp-first-field-has-own-bounds
|
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Forces Pointer Bounds Checker to use narrowed bounds for address of the
|
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first field in the structure. By default pointer to the first field has
|
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the same bounds as pointer to the whole structure.
|
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Forces Pointer Bounds Checker to use narrowed bounds for the address of the
|
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first field in the structure. By default a pointer to the first field has
|
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the same bounds as a pointer to the whole structure.
|
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|
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@item -fchkp-narrow-to-innermost-array
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@opindex fchkp-narrow-to-innermost-array
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@opindex fno-chkp-narrow-to-innermost-array
|
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Forces Pointer Bounds Checker to use bounds of the innermost arrays in
|
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case of nested static arryas access. By default it is disabled and
|
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case of nested static array access. By default this option is disabled and
|
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bounds of the outermost array are used.
|
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|
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@item -fchkp-optimize
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|
|
@ -5900,13 +5911,13 @@ optimization levels @option{-O}, @option{-O2}, @option{-O3}.
|
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@item -fchkp-use-fast-string-functions
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@opindex fchkp-use-fast-string-functions
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@opindex fno-chkp-use-fast-string-functions
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Allow to use @code{*_nobnd} versions of string functions (not copying bounds)
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Enables use of @code{*_nobnd} versions of string functions (not copying bounds)
|
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by Pointer Bounds Checker. Disabled by default.
|
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|
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@item -fchkp-use-nochk-string-functions
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@opindex fchkp-use-nochk-string-functions
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@opindex fno-chkp-use-nochk-string-functions
|
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Allow to use @code{*_nochk} versions of string functions (not checking bounds)
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Enables use of @code{*_nochk} versions of string functions (not checking bounds)
|
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by Pointer Bounds Checker. Disabled by default.
|
||||
|
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@item -fchkp-use-static-bounds
|
||||
|
|
@ -5918,16 +5929,17 @@ 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
|
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generating them each time it is required. By default enabled when
|
||||
Use statically-initialized bounds for constant bounds instead of
|
||||
generating them each time they are 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
|
||||
With this option, objects with incomplete type whose
|
||||
dynamically-obtained size is zero are treated as having infinite size
|
||||
instead by Pointer Bounds
|
||||
Checker. This option may be helpful if a program is linked with a library
|
||||
missing size information for some symbols. Disabled by default.
|
||||
|
||||
@item -fchkp-check-read
|
||||
|
|
@ -5958,15 +5970,16 @@ Enabled by default.
|
|||
@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.
|
||||
marked with the @code{bnd_instrument} attribute
|
||||
(@pxref{Function Attributes}). 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}
|
||||
Allows Pointer Bounds Checker to replace calls to built-in functions
|
||||
with calls to wrapper functions. When @option{-fchkp-use-wrappers}
|
||||
is used to link a program, the GCC driver automatically links
|
||||
agains @option{libmpxwrappers}. See also @option{-static-libmpxwrappers}.
|
||||
against @file{libmpxwrappers}. See also @option{-static-libmpxwrappers}.
|
||||
Enabled by default.
|
||||
|
||||
@item -fdump-final-insns@r{[}=@var{file}@r{]}
|
||||
|
|
@ -11278,9 +11291,9 @@ other libraries statically.
|
|||
|
||||
@item -static-libmpx
|
||||
@opindex static-libmpx
|
||||
When @option{-fcheck-pointer bounds} and @option{-mmpx} options are
|
||||
When the @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,
|
||||
@file{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,
|
||||
|
|
@ -11288,9 +11301,9 @@ 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
|
||||
When the @option{-fcheck-pointer bounds} and @option{-mmpx} options are used
|
||||
to link a program without also using @option{-fno-chkp-use-wrappers}, the
|
||||
GCC driver automatically links against @file{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}
|
||||
|
|
|
|||
Loading…
Reference in New Issue