Add remote unwinding support for macOS (#365)

* Add remote unwinding support for macOS
* Fix broken Win build by bumping minimum language requirement to C11
* Update license headers
* Rename remote_unwind to remote
* Revert Gparser.c

21 files changed, 146 insertions, 24 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc12eb7e..245a41bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,8 @@ project(libunwind)
 
 cmake_minimum_required(VERSION 3.16.1)
 
+set(CMAKE_C_STANDARD 11)
+
 set(PKG_MAJOR "1")
 set(PKG_MINOR "6")
 set(PKG_EXTRA "-rc1")
@@ -50,7 +52,8 @@ if ("${CMAKE_GENERATOR}" MATCHES "^Visual Studio.*$")
   add_compile_options(/permissive-)
 
   # files for cross os compilation
-  include_directories(include/win)
+  include_directories(include/remote)
+  include_directories(include/remote/win)
 
   # Warnings in release builds
   add_compile_options(-wd4068) # ignore unknown pragma warnings (gcc pragmas)
@@ -75,14 +78,14 @@ if ("${CMAKE_GENERATOR}" MATCHES "^Visual Studio.*$")
   # Fake it until support is added
   check_include_files(stdalign.h HAVE_STDALIGN_H)
   if (NOT HAVE_STDALIGN_H)
-    configure_file(include/win/fakestdalign.h.in ${CMAKE_CURRENT_BINARY_DIR}/include/stdalign.h)
+    configure_file(include/remote/win/fakestdalign.h.in ${CMAKE_CURRENT_BINARY_DIR}/include/stdalign.h)
   endif (NOT HAVE_STDALIGN_H)
 
   # MSVC compiler is currently missing C11 stdatomic.h header
   # Fake it until support is added
   check_include_files(stdatomic.h HAVE_STDATOMIC_H)
   if (NOT HAVE_STDATOMIC_H)
-    configure_file(include/win/fakestdatomic.h.in ${CMAKE_CURRENT_BINARY_DIR}/include/stdatomic.h)
+    configure_file(include/remote/win/fakestdatomic.h.in ${CMAKE_CURRENT_BINARY_DIR}/include/stdatomic.h)
   endif (NOT HAVE_STDATOMIC_H)
 
   # MSVC compiler is currently missing C11 _Thread_local
diff --git a/include/win/elf.h b/include/remote/elf.h
index 5089ff6b..79193ab4 100644
--- a/include/win/elf.h
+++ b/include/remote/elf.h
@@ -1,11 +1,8 @@
 // This is an incomplete & imprecice implementation
 // It defers to the open source freebsd-elf implementations.
 
-// Since this is only intended for VC++ compilers
-// use #pragma once instead of guard macros
-#pragma once
-
-#ifdef _MSC_VER // Only for cross compilation to windows
+#ifndef ELF_H
+#define ELF_H
 
 #include <inttypes.h>
 
@@ -13,4 +10,4 @@
 #include "freebsd-elf32.h"
 #include "freebsd-elf64.h"
 
-#endif // _MSC_VER
+#endif // ELF_H
diff --git a/include/win/endian.h b/include/remote/endian.h
index 56fb68a7..6aa6466d 100644
--- a/include/win/endian.h
+++ b/include/remote/endian.h
@@ -1,16 +1,12 @@
 // This is an incomplete & imprecice implementation of the
 // standard file by the same name
 
-
-// Since this is only intended for VC++ compilers
-// use #pragma once instead of guard macros
-#pragma once
-
-#ifdef _MSC_VER // Only for cross compilation to windows
+#ifndef ENDIAN_H
+#define ENDIAN_H
 
 #define __LITTLE_ENDIAN        1234
 #define __BIG_ENDIAN           4321
 
 #define __BYTE_ORDER __LITTLE_ENDIAN
 
-#endif // _MSC_VER
+#endif // ENDIAN_H
diff --git a/include/win/freebsd-elf32.h b/include/remote/freebsd-elf32.h
index b4c0d942..b4c0d942 100644
--- a/include/win/freebsd-elf32.h
+++ b/include/remote/freebsd-elf32.h
diff --git a/include/win/freebsd-elf64.h b/include/remote/freebsd-elf64.h
index 0991fe35..0991fe35 100644
--- a/include/win/freebsd-elf64.h
+++ b/include/remote/freebsd-elf64.h
diff --git a/include/win/freebsd-elf_common.h b/include/remote/freebsd-elf_common.h
index 7aef2d49..cc780208 100644
--- a/include/win/freebsd-elf_common.h
+++ b/include/remote/freebsd-elf_common.h
@@ -195,12 +195,12 @@ typedef struct {
 #define SHT_STRTAB		3	/* string table section */
 #define SHT_RELA		4	/* relocation section with addends */
 #define SHT_HASH		5	/* symbol hash table section */
-#define SHT_DYNAMIC		6	/* dynamic section */ 
+#define SHT_DYNAMIC		6	/* dynamic section */
 #define SHT_NOTE		7	/* note section */
 #define SHT_NOBITS		8	/* no space section */
 #define SHT_REL			9	/* relocation section - no addends */
 #define SHT_SHLIB		10	/* reserved - purpose unknown */
-#define SHT_DYNSYM		11	/* dynamic symbol table section */ 
+#define SHT_DYNSYM		11	/* dynamic symbol table section */
 #define SHT_INIT_ARRAY		14	/* Initialization function pointers. */
 #define SHT_FINI_ARRAY		15	/* Termination function pointers. */
 #define SHT_PREINIT_ARRAY	16	/* Pre-initialization function ptrs. */
diff --git a/include/remote/mac/ucontext.h b/include/remote/mac/ucontext.h
new file mode 100644
index 00000000..bb09f9cc
--- /dev/null
+++ b/include/remote/mac/ucontext.h
@@ -0,0 +1,47 @@
+/* Copyright (C) 2022 Hewlett-Packard Co.
+     Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#define UC_MCONTEXT_GREGS_R8    0x28
+#define UC_MCONTEXT_GREGS_R9    0x30
+#define UC_MCONTEXT_GREGS_R10   0x38
+#define UC_MCONTEXT_GREGS_R11   0x40
+#define UC_MCONTEXT_GREGS_R12   0x48
+#define UC_MCONTEXT_GREGS_R13   0x50
+#define UC_MCONTEXT_GREGS_R14   0x58
+#define UC_MCONTEXT_GREGS_R15   0x60
+#define UC_MCONTEXT_GREGS_RDI   0x68
+#define UC_MCONTEXT_GREGS_RSI   0x70
+#define UC_MCONTEXT_GREGS_RBP   0x78
+#define UC_MCONTEXT_GREGS_RBX   0x80
+#define UC_MCONTEXT_GREGS_RDX   0x88
+#define UC_MCONTEXT_GREGS_RAX   0x90
+#define UC_MCONTEXT_GREGS_RCX   0x98
+#define UC_MCONTEXT_GREGS_RSP   0xa0
+#define UC_MCONTEXT_GREGS_RIP   0xa8
+#define UC_MCONTEXT_FPREGS_PTR  0x1a8
+#define UC_MCONTEXT_FPREGS_MEM  0xe0
+#define UC_SIGMASK              0x128
+#define FPREGS_OFFSET_MXCSR     0x18
+
+#include <sys/ucontext.h>
diff --git a/include/win/fakestdalign.h.in b/include/remote/win/fakestdalign.h.in
index 6eb292c9..3baf6268 100644
--- a/include/win/fakestdalign.h.in
+++ b/include/remote/win/fakestdalign.h.in
@@ -4,6 +4,6 @@
 #ifndef FAKE_STD_ALIGN_H
 #define FAKE_STD_ALIGN_H
 
-#define alignas(x) 
+#define alignas(x)
 
 #endif // FAKE_STD_ALIGN_H
diff --git a/include/win/fakestdatomic.h.in b/include/remote/win/fakestdatomic.h.in
index 48cde832..799770e8 100644
--- a/include/win/fakestdatomic.h.in
+++ b/include/remote/win/fakestdatomic.h.in
@@ -15,7 +15,7 @@ typedef uint8_t atomic_flag;
 
 #define atomic_compare_and_exchange_strong(x, y, z) return ((*(x) == *(y)) ? ((*(x) = z), true) : ((*(y) = *(x)),false))
 
-#define atomic_fetch_add(x, y) *(x) += (y), (*(x) - (y))  
+#define atomic_fetch_add(x, y) *(x) += (y), (*(x) - (y))
 
 static inline void atomic_flag_clear(volatile atomic_flag* flag)
 {
diff --git a/include/win/pthread.h b/include/remote/win/pthread.h
index 8a0b0a18..8a0b0a18 100644
--- a/include/win/pthread.h
+++ b/include/remote/win/pthread.h
diff --git a/include/win/signal.h b/include/remote/win/signal.h
index 48e8e3f9..48e8e3f9 100644
--- a/include/win/signal.h
+++ b/include/remote/win/signal.h
diff --git a/include/win/sys/mman.h b/include/remote/win/sys/mman.h
index 0a3f6f93..0a3f6f93 100644
--- a/include/win/sys/mman.h
+++ b/include/remote/win/sys/mman.h
diff --git a/include/win/sys/stat.h b/include/remote/win/sys/stat.h
index a5b54dea..a5b54dea 100644
--- a/include/win/sys/stat.h
+++ b/include/remote/win/sys/stat.h
diff --git a/include/win/sys/syscall.h b/include/remote/win/sys/syscall.h
index d655d1a8..d655d1a8 100644
--- a/include/win/sys/syscall.h
+++ b/include/remote/win/sys/syscall.h
diff --git a/include/win/sys/types.h b/include/remote/win/sys/types.h
index 7b131f6e..7b131f6e 100644
--- a/include/win/sys/types.h
+++ b/include/remote/win/sys/types.h
diff --git a/include/win/sys/ucontext.h b/include/remote/win/sys/ucontext.h
index c37c3aba..c37c3aba 100644
--- a/include/win/sys/ucontext.h
+++ b/include/remote/win/sys/ucontext.h
diff --git a/include/win/ucontext.h b/include/remote/win/ucontext.h
index fb5aaf73..fb5aaf73 100644
--- a/include/win/ucontext.h
+++ b/include/remote/win/ucontext.h
diff --git a/include/win/unistd.h b/include/remote/win/unistd.h
index d4ff2278..d4ff2278 100644
--- a/include/win/unistd.h
+++ b/include/remote/win/unistd.h
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 82ef68a9..7b7d1446 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -351,7 +351,7 @@ endif()
 
 add_library(libunwind
   OBJECT
-  win/pal-single-threaded.c
+  remote/win/missing-functions.c
   # ${libunwind_la_SOURCES}  Local...
   ${libunwind_remote_la_SOURCES}
     # Commented out above for LOCAL + REMOTE runtime build
diff --git a/src/remote/mac/missing-functions.c b/src/remote/mac/missing-functions.c
new file mode 100644
index 00000000..f0a7b3f5
--- /dev/null
+++ b/src/remote/mac/missing-functions.c
@@ -0,0 +1,76 @@
+/* Copyright (C) 2022 Hewlett-Packard Co.
+     Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+// This is minimal implementation functions files required to cross compile
+// libunwind on MacOS for UNW_REMOTE_ONLY application.
+
+#include <pthread.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdatomic.h>
+#include "libunwind_i.h"
+#include "compiler.h"
+
+unw_addr_space_t UNW_OBJ(local_addr_space);
+
+unw_accessors_t *
+unw_get_accessors (unw_addr_space_t as)
+{
+  if (!atomic_load(&tdep_init_done))
+    tdep_init ();
+  return &as->acc;
+}
+
+unw_accessors_t *
+unw_get_accessors_int (unw_addr_space_t as)
+{
+  return unw_get_accessors(as);
+}
+
+#if defined(TARGET_AMD64) && !defined(HOST_AMD64)
+#define X86_64_SCF_NONE 0
+#endif
+
+#if defined(TARGET_ARM64) && !defined(HOST_ARM64)
+#define AARCH64_SCF_NONE 0
+#endif
+
+int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+#ifdef TARGET_AMD64
+  return c->sigcontext_format != X86_64_SCF_NONE;
+#elif defined(TARGET_ARM64)
+  return c->sigcontext_format != AARCH64_SCF_NONE;
+#else
+  #error Unexpected target
+#endif
+}
+
+int
+UNW_OBJ(handle_signal_frame) (unw_cursor_t *cursor)
+{
+  return -UNW_EBADFRAME;
+}
diff --git a/src/win/pal-single-threaded.c b/src/remote/win/missing-functions.c
index acaa4659..8bd362a1 100644
--- a/src/win/pal-single-threaded.c
+++ b/src/remote/win/missing-functions.c
@@ -1,7 +1,8 @@
-/* libunwind - a platform-independent unwind library
-   Copyright (c) 2003-2005 Hewlett-Packard Development Company, L.P.
-        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+/* Copyright (C) 2022 Hewlett-Packard Co.
+     Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
+
 This file is part of libunwind.
+
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
@@ -9,8 +10,10 @@ without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
+
 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.
+
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND