head	1.4;
access;
symbols
	netbsd-11-0-RC4:1.3
	netbsd-11-0-RC3:1.3
	netbsd-11-0-RC2:1.3
	netbsd-11-0-RC1:1.3
	gcc-14-3-0:1.1.1.3
	perseant-exfatfs-base-20250801:1.3
	netbsd-11:1.3.0.4
	netbsd-11-base:1.3
	gcc-12-5-0:1.1.1.2
	perseant-exfatfs-base-20240630:1.3
	gcc-12-4-0:1.1.1.2
	perseant-exfatfs:1.3.0.2
	perseant-exfatfs-base:1.3
	gcc-12-3-0:1.1.1.2
	gcc-10-5-0:1.1.1.1
	gcc-10-4-0:1.1.1.1
	cjep_sun2x:1.2.0.4
	cjep_sun2x-base:1.2
	cjep_staticlib_x-base1:1.2
	cjep_staticlib_x:1.2.0.2
	cjep_staticlib_x-base:1.2
	gcc-10-3-0:1.1.1.1
	FSF:1.1.1;
locks; strict;
comment	@// @;


1.4
date	2025.09.14.00.08.55;	author mrg;	state Exp;
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1.3
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1.2
date	2021.04.11.23.54.25;	author mrg;	state dead;
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1.1
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1.1.1.1
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1.1.1.2
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1.1.1.3
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desc
@@


1.4
log
@merge GCC 14.3.0.
@
text
@//===-- asan_premap_shadow.cpp --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Reserve shadow memory with an ifunc resolver.
//===----------------------------------------------------------------------===//

#include "asan_mapping.h"

#if ASAN_PREMAP_SHADOW

#include "asan_premap_shadow.h"
#include "sanitizer_common/sanitizer_posix.h"

namespace __asan {

// The code in this file needs to run in an unrelocated binary. It may not
// access any external symbol, including its own non-hidden globals.

// Conservative upper limit.
uptr PremapShadowSize() {
  uptr granularity = GetMmapGranularity();
  return RoundUpTo(GetMaxVirtualAddress() >> ASAN_SHADOW_SCALE, granularity);
}

// Returns an address aligned to 8 pages, such that one page on the left and
// PremapShadowSize() bytes on the right of it are mapped r/o.
uptr PremapShadow() {
  return MapDynamicShadow(PremapShadowSize(), /*mmap_alignment_scale*/ 3,
                          /*min_shadow_base_alignment*/ 0, kHighMemEnd);
}

bool PremapShadowFailed() {
  uptr shadow = reinterpret_cast<uptr>(&__asan_shadow);
  uptr resolver = reinterpret_cast<uptr>(&__asan_premap_shadow);
  // shadow == resolver is how Android KitKat and older handles ifunc.
  // shadow == 0 just in case.
  if (shadow == 0 || shadow == resolver)
    return true;
  return false;
}
} // namespace __asan

extern "C" {
decltype(__asan_shadow)* __asan_premap_shadow() {
  // The resolver may be called multiple times. Map the shadow just once.
  static uptr premapped_shadow = 0;
  if (!premapped_shadow) premapped_shadow = __asan::PremapShadow();
  return reinterpret_cast<decltype(__asan_shadow)*>(premapped_shadow);
}

// __asan_shadow is a "function" that has the same address as the first byte of
// the shadow mapping.
INTERFACE_ATTRIBUTE __attribute__((ifunc("__asan_premap_shadow"))) void
__asan_shadow();
}

#endif // ASAN_PREMAP_SHADOW
@


1.3
log
@make this actually be GCC 12.3.0's libsanitizer.

the libsanitizer we used with GCC 9 and GCC 10 was significantly
ahead of the GCC 9 and GCC 10 provided versions.
@
text
@d29 1
a29 1
  return RoundUpTo(GetMaxVirtualAddress() >> SHADOW_SCALE, granularity);
@


1.2
log
@revert sanitizer back to the version we were using with GCC 9, since
that one was already newer than the GCC 10 version.
@
text
@d35 2
a36 16
  uptr granularity = GetMmapGranularity();
  uptr alignment = granularity * 8;
  uptr left_padding = granularity;
  uptr shadow_size = PremapShadowSize();
  uptr map_size = shadow_size + left_padding + alignment;

  uptr map_start = (uptr)MmapNoAccess(map_size);
  CHECK_NE(map_start, ~(uptr)0);

  uptr shadow_start = RoundUpTo(map_start + left_padding, alignment);
  uptr shadow_end = shadow_start + shadow_size;
  internal_munmap(reinterpret_cast<void *>(map_start),
                  shadow_start - left_padding - map_start);
  internal_munmap(reinterpret_cast<void *>(shadow_end),
                  map_start + map_size - shadow_end);
  return shadow_start;
@


1.1
log
@Initial revision
@
text
@@


1.1.1.1
log
@initial import of GCC 10.3.0.  main changes include:

caveats:
- ABI issue between c++14 and c++17 fixed
- profile mode is removed from libstdc++
- -fno-common is now the default

new features:
- new flags -fallocation-dce, -fprofile-partial-training,
  -fprofile-reproducible, -fprofile-prefix-path, and -fanalyzer
- many new compile and link time optimisations
- enhanced drive optimisations
- openacc 2.6 support
- openmp 5.0 features
- new warnings: -Wstring-compare and -Wzero-length-bounds
- extended warnings: -Warray-bounds, -Wformat-overflow,
  -Wrestrict, -Wreturn-local-addr, -Wstringop-overflow,
  -Warith-conversion, -Wmismatched-tags, and -Wredundant-tags
- some likely C2X features implemented
- more C++20 implemented
- many new arm & intel CPUs known

hundreds of reported bugs are fixed.  full list of changes
can be found at:

   https://gcc.gnu.org/gcc-10/changes.html
@
text
@@


1.1.1.2
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@d35 16
a50 2
  return MapDynamicShadow(PremapShadowSize(), /*mmap_alignment_scale*/ 3,
                          /*min_shadow_base_alignment*/ 0, kHighMemEnd);
@


1.1.1.3
log
@initial import of GCC 14.3.0.

major changes in GCC 13:
- improved sanitizer
- zstd debug info compression
- LTO improvements
- SARIF based diagnostic support
- new warnings: -Wxor-used-as-pow, -Wenum-int-mismatch, -Wself-move,
  -Wdangling-reference
- many new -Wanalyzer* specific warnings
- enhanced warnings: -Wpessimizing-move, -Wredundant-move
- new attributes to mark file descriptors, c++23 "assume"
- several C23 features added
- several C++23 features added
- many new features for Arm, x86, RISC-V

major changes in GCC 14:
- more strict C99 or newer support
- ia64* marked deprecated (but seemingly still in GCC 15.)
- several new hardening features
- support for "hardbool", which can have user supplied values of true/false
- explicit support for stack scrubbing upon function exit
- better auto-vectorisation support
- added clang-compatible __has_feature and __has_extension
- more C23, including -std=c23
- several C++26 features added
- better diagnostics in C++ templates
- new warnings: -Wnrvo, Welaborated-enum-base
- many new features for Arm, x86, RISC-V
- possible ABI breaking change for SPARC64 and small structures with arrays
  of floats.
@
text
@d29 1
a29 1
  return RoundUpTo(GetMaxVirtualAddress() >> ASAN_SHADOW_SCALE, granularity);
@