1 files changed, 163 insertions, 0 deletions
diff --git a/src/remote/win/missing-functions.c b/src/remote/win/missing-functions.c
new file mode 100644
index 00000000..8bd362a1
--- /dev/null
+++ b/src/remote/win/missing-functions.c
@@ -0,0 +1,163 @@
+/* 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 of posix functions files required to cross compile
+// libunwind on a Windows host for UNW_REMOTE_ONLY application.
+
+// This a completely thread unsafe implementation
+// It is likely sufficient for a single thread's usage of UNW_REMOTE_ONLY debugging of
+// a read-only dump.
+
+#include <pthread.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include "libunwind_i.h"
+#include "compiler.h"
+
+int getpagesize(void)
+{
+    // 4096 is truth for most targets
+    // Unlikely to matter in dump debugging
+    return 4096;
+}
+
+long sysconf(int name)
+{
+    if (name == _SC_PAGESIZE)
+    {
+        return getpagesize();
+    }
+
+    errno = EINVAL;
+    return -1;
+}
+
+void* mmap(void *addr, size_t length, int prot, int flags, int fd, size_t offset)
+{
+    // We shouldn't be doing anything other than anonymous mappings
+    if ((flags & MAP_ANONYMOUS) == 0)
+        return MAP_FAILED;
+
+    return calloc(1, length);
+}
+
+int munmap(void *addr, size_t length)
+{
+    free(addr);
+    return 0;
+}
+
+int pthread_key_create(pthread_key_t *key, void (*destroy)(void*))
+{
+    // We are not implementing pthread_getspecific so this sholdn't matter much
+    return 0;
+}
+
+int pthread_setspecific(pthread_key_t key, const void *value)
+{
+    // We are not implementing pthread_getspecific so this sholdn't matter much
+    return 0;
+}
+
+int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
+{
+    // For dump debugging we don't need locking
+    // We expect to run in a single thread
+    return 0;
+}
+
+int pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+    // For dump debugging we don't need locking
+    // We expect to run in a single thread
+    return 0;
+}
+
+int pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+    // For dump debugging we don't need locking
+    // We expect to run in a single thread
+    return 0;
+}
+
+int pthread_once(pthread_once_t *control, void (*init)(void))
+{
+    if (control == 0)
+        return -1;
+
+    // We expect to run in a single thread
+    // We don't need atomics here
+    if (*control != PTHREAD_ONCE_INIT)
+    {
+        (*init)();
+        *control = ~PTHREAD_ONCE_INIT;
+    }
+    return 0;
+}
+
+int sigfillset(sigset_t *set)
+{
+    return 0;
+}
+
+ssize_t read(int fd, void *buf, size_t count)
+{
+    // For dump debugging we shouldn't need to open files
+    // Especially since we didn't implement open()
+    return -1;
+}
+
+ssize_t write(int fd, const void *buf, size_t nbyte)
+{
+    // For dump debugging we shouldn't need to open files
+    // Especially since we didn't implement open()
+    return -1;
+}
+
+int close(int fd)
+{
+    // For dump debugging we shouldn't need to open files
+    // Especially since we didn't implement open()
+    return -1;
+}
+
+// ALIAS(x) is nop.  We need this alias to link properly
+unw_accessors_t * unw_get_accessors_int (unw_addr_space_t as)
+{
+    return unw_get_accessors(as);
+}
+
+int stat(const char *path, struct stat *buf)
+{
+    return 0;
+}
+
+int fstat(int fd, struct stat *buf)
+{
+    return 0;
+}