1 files changed, 77 insertions, 0 deletions
diff --git a/src/debug/createdump/dumpwriter.h b/src/debug/createdump/dumpwriter.h
new file mode 100644
index 0000000000..0b4f88cbd6
--- /dev/null
+++ b/src/debug/createdump/dumpwriter.h
@@ -0,0 +1,77 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#ifdef BIT64
+#define ELF_CLASS ELFCLASS64
+#else
+#define ELF_CLASS ELFCLASS32
+#endif
+
+#define Ehdr   ElfW(Ehdr)
+#define Phdr   ElfW(Phdr)
+#define Shdr   ElfW(Shdr)
+#define Nhdr   ElfW(Nhdr)
+#define auxv_t ElfW(auxv_t)
+
+#if defined(__x86_64__)
+#define ELF_ARCH  EM_X86_64
+#elif defined(__i386__)
+#define ELF_ARCH  EM_386
+#elif defined(__arm__)
+#define ELF_ARCH  EM_ARM
+#endif
+
+#define PH_HDR_CANARY 0xFFFF
+
+#ifndef NT_FILE
+#define NT_FILE		0x46494c45
+#endif
+
+class DumpWriter : IUnknown
+{
+private:
+    LONG m_ref;                         // reference count
+    int m_fd;
+    CrashInfo& m_crashInfo;
+    BYTE m_tempBuffer[0x4000];
+
+public:
+    DumpWriter(CrashInfo& crashInfo);
+    virtual ~DumpWriter();
+    bool OpenDump(const char* dumpFileName);
+    bool WriteDump();
+
+    // IUnknown
+    STDMETHOD(QueryInterface)(___in REFIID InterfaceId, ___out PVOID* Interface);
+    STDMETHOD_(ULONG, AddRef)();
+    STDMETHOD_(ULONG, Release)();
+
+private:
+    bool WriteProcessInfo();
+    bool WriteAuxv();
+    size_t GetNTFileInfoSize(size_t* alignmentBytes = nullptr);
+    bool WriteNTFileInfo();
+    bool WriteThread(const ThreadInfo& thread, int fatal_signal);
+    bool WriteData(const void* buffer, size_t length);
+
+    const size_t GetProcessInfoSize() const { return sizeof(Nhdr) + 8 + sizeof(prpsinfo_t); }
+    const size_t GetAuxvInfoSize() const { return sizeof(Nhdr) + 8 + m_crashInfo.GetAuxvSize(); }
+    const size_t GetThreadInfoSize() const 
+    {
+        return m_crashInfo.Threads().size() * ((sizeof(Nhdr) + 8 + sizeof(prstatus_t))
+#if defined(__i386__) || defined(__x86_64__)
+            + sizeof(Nhdr) + 8 + sizeof(user_fpregs_struct)
+#endif
+#if defined(__i386__)
+            + sizeof(Nhdr) + 8 + sizeof(user_fpxregs_struct)
+#endif
+        );
+    }
+};
+
+static inline int sex()
+{
+  int probe = 1;
+  return !*(char *)&probe;
+}