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SchrodingerZhupetrhosek
SchrodingerZhu
and
petrhosek
authored
Reland "[libc] build fix for sigsetjmp (#137047)" (#137214)
Reland `sigsetjmp` patches with build fixes. We wrap every target replying on the epilogue library into conditional checks. --------- Co-authored-by: Petr Hosek <phosek@google.com>
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19 files changed

+428
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lines changed

19 files changed

+428
-8
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‎libc/config/linux/x86_64/entrypoints.txt‎

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@@ -1060,6 +1060,8 @@ if(LLVM_LIBC_FULL_BUILD)
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# setjmp.h entrypoints
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libc.src.setjmp.longjmp
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libc.src.setjmp.setjmp
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libc.src.setjmp.siglongjmp
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libc.src.setjmp.sigsetjmp
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# stdio.h entrypoints
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libc.src.stdio.clearerr

‎libc/hdr/CMakeLists.txt‎

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@@ -223,5 +223,14 @@ add_proxy_header_library(
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libc.include.wchar
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)
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# offsetof is a macro inside compiler resource header stddef.h
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add_proxy_header_library(
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offsetof_macros
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HDRS
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offsetof_macros.h
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FULL_BUILD_DEPENDS
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libc.include.llvm-libc-macros.offsetof_macro
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)
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add_subdirectory(types)
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add_subdirectory(func)

‎libc/hdr/offsetof_macros.h‎

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@@ -0,0 +1,23 @@
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//===-- Definition of macros for offsetof ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_HDR_OFFSETOF_MACROS_H
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#define LLVM_LIBC_HDR_OFFSETOF_MACROS_H
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#ifdef LIBC_FULL_BUILD
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#include "include/llvm-libc-macros/offsetof-macro.h"
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#else // Overlay mode
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#define __need_offsetof
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#include <stddef.h>
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#endif // LLVM_LIBC_FULL_BUILD
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#endif // LLVM_LIBC_HDR_OFFSETOF_MACROS_H

‎libc/include/llvm-libc-types/CMakeLists.txt‎

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@@ -39,7 +39,6 @@ add_header(gid_t HDR gid_t.h)
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add_header(uid_t HDR uid_t.h)
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add_header(imaxdiv_t HDR imaxdiv_t.h)
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add_header(ino_t HDR ino_t.h)
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add_header(jmp_buf HDR jmp_buf.h)
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add_header(mbstate_t HDR mbstate_t.h)
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add_header(mode_t HDR mode_t.h)
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add_header(mtx_t HDR mtx_t.h DEPENDS .__futex_word .__mutex_type)
@@ -83,6 +82,7 @@ add_header(union_sigval HDR union_sigval.h)
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add_header(siginfo_t HDR siginfo_t.h DEPENDS .union_sigval .pid_t .uid_t .clock_t)
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add_header(sig_atomic_t HDR sig_atomic_t.h)
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add_header(sigset_t HDR sigset_t.h DEPENDS libc.include.llvm-libc-macros.signal_macros)
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add_header(jmp_buf HDR jmp_buf.h DEPENDS .sigset_t)
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add_header(struct_sigaction HDR struct_sigaction.h DEPENDS .sigset_t .siginfo_t)
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add_header(struct_timespec HDR struct_timespec.h DEPENDS .time_t)
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add_header(

‎libc/include/llvm-libc-types/jmp_buf.h‎

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@@ -9,6 +9,18 @@
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#ifndef LLVM_LIBC_TYPES_JMP_BUF_H
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#define LLVM_LIBC_TYPES_JMP_BUF_H
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// TODO: implement sigjmp_buf related functions for other architectures
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// Issue: https://github.com/llvm/llvm-project/issues/136358
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#if defined(__linux__)
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#if defined(__i386__) || defined(__x86_64__)
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#define __LIBC_HAS_SIGJMP_BUF
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#endif
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#endif
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#if defined(__LIBC_HAS_SIGJMP_BUF)
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#include "sigset_t.h"
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#endif
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typedef struct {
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#ifdef __x86_64__
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__UINT64_TYPE__ rbx;
@@ -50,8 +62,22 @@ typedef struct {
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#else
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#error "__jmp_buf not available for your target architecture."
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#endif
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#if defined(__LIBC_HAS_SIGJMP_BUF)
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// return address
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void *sig_retaddr;
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// extra register buffer to avoid indefinite stack growth in sigsetjmp
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void *sig_extra;
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// signal masks
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sigset_t sigmask;
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#endif
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} __jmp_buf;
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typedef __jmp_buf jmp_buf[1];
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#if defined(__LIBC_HAS_SIGJMP_BUF)
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typedef __jmp_buf sigjmp_buf[1];
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#endif
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#undef __LIBC_HAS_SIGJMP_BUF
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#endif // LLVM_LIBC_TYPES_JMP_BUF_H

‎libc/include/setjmp.yaml‎

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@@ -21,3 +21,19 @@ functions:
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- _Returns_twice
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arguments:
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- type: jmp_buf
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- name: sigsetjmp
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standards:
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- POSIX
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return_type: int
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attributes:
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- _Returns_twice
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arguments:
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- type: sigjmp_buf
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- type: int
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- name: siglongjmp
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standards:
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- POSIX
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return_type: _Noreturn void
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arguments:
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- type: sigjmp_buf
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- type: int

‎libc/src/setjmp/CMakeLists.txt‎

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@@ -1,3 +1,13 @@
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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
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add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
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add_object_library(
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sigsetjmp_epilogue
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ALIAS
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DEPENDS
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.${LIBC_TARGET_OS}.sigsetjmp_epilogue
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)
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endif()
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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
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add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
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endif()
@@ -15,3 +25,22 @@ add_entrypoint_object(
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DEPENDS
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.${LIBC_TARGET_ARCHITECTURE}.longjmp
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)
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if (TARGET libc.src.setjmp.sigsetjmp_epilogue)
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add_entrypoint_object(
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siglongjmp
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SRCS
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siglongjmp.cpp
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HDRS
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siglongjmp.h
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DEPENDS
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.longjmp
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)
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add_entrypoint_object(
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sigsetjmp
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ALIAS
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DEPENDS
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.${LIBC_TARGET_ARCHITECTURE}.sigsetjmp
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)
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endif()

‎libc/src/setjmp/linux/CMakeLists.txt‎

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@@ -0,0 +1,12 @@
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add_object_library(
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sigsetjmp_epilogue
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HDRS
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../sigsetjmp_epilogue.h
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SRCS
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sigsetjmp_epilogue.cpp
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DEPENDS
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libc.src.__support.common
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libc.src.__support.OSUtil.osutil
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libc.hdr.types.jmp_buf
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libc.hdr.types.sigset_t
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)

‎libc/src/setjmp/linux/sigsetjmp_epilogue.cpp‎

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@@ -0,0 +1,25 @@
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//===-- Implementation of sigsetjmp_epilogue ------------------------------===//
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//
3+
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
5+
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/setjmp/sigsetjmp_epilogue.h"
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#include "src/__support/OSUtil/syscall.h"
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#include "src/__support/common.h"
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#include <sys/syscall.h> // For syscall numbers.
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namespace LIBC_NAMESPACE_DECL {
15+
[[gnu::returns_twice]] int sigsetjmp_epilogue(jmp_buf buffer, int retval) {
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// If set is NULL, then the signal mask is unchanged (i.e., how is
17+
// ignored), but the current value of the signal mask is nevertheless
18+
// returned in oldset (if it is not NULL).
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syscall_impl<long>(SYS_rt_sigprocmask, SIG_SETMASK,
20+
/* set= */ retval ? &buffer->sigmask : nullptr,
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/* old_set= */ retval ? nullptr : &buffer->sigmask,
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sizeof(sigset_t));
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return retval;
24+
}
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} // namespace LIBC_NAMESPACE_DECL

‎libc/src/setjmp/setjmp_impl.h‎

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@@ -29,7 +29,8 @@ namespace LIBC_NAMESPACE_DECL {
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#ifdef LIBC_COMPILER_IS_GCC
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[[gnu::nothrow]]
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#endif
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__attribute__((returns_twice)) int setjmp(jmp_buf buf);
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[[gnu::returns_twice]] int
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setjmp(jmp_buf buf);
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} // namespace LIBC_NAMESPACE_DECL
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