Fixes for aarch64/i386

Author: peadar

libpstack/arch.h

@@ -120,9 +120,7 @@ using DwarfNames = std::vector<std::pair<int, std::string_view>>;
 // "general" registers.
 using ArchRegs = std::unordered_map<std::string_view, DwarfNames>;
 
-#ifndef __aarch64__
 void gregset2user(user_regs_struct &core, const gregset_t greg);
-#endif
 
 struct Get {
    template <typename T> using Val  = T;

process.cc

@@ -8,7 +8,7 @@
 #include <iostream>
 #include <limits>
 #include <set>
-#include <sys/ucontext.h>
+#include <ucontext.h>
 #include <sys/wait.h>
 #include <csignal>
 #include <sys/signal.h>

reader.cc

@@ -69,7 +69,7 @@ AbstractMemReader::read(Off off, size_t count, char *ptr) const
 {
     if (off > Off(size()))
         throw (Exception() << "read past end of memory");
-    size_t rc = std::min(count, size() - size_t(off));
+    size_t rc = std::min(count, size_t(size()) - size_t(off));
     memcpy(ptr, ptroff(data(), off), rc);
     return rc;
 }