Merge pull request #1678 from ibuclaw/testdataalign

Ensure that the writable data segment is aligned.
merged-on-behalf-of: Nathan Sashihara <n8sh@users.noreply.github.com>

Author: dlang-bot

src/rt/sections_elf_shared.d

@@ -676,7 +676,7 @@ version (Shared)
         {
             if (phdr.p_type == PT_DYNAMIC)
             {
-                auto p = cast(ElfW!"Dyn"*)(info.dlpi_addr + phdr.p_vaddr);
+                auto p = cast(ElfW!"Dyn"*)(info.dlpi_addr + (phdr.p_vaddr & ~(size_t.sizeof - 1)));
                 dyns = p[0 .. phdr.p_memsz / ElfW!"Dyn".sizeof];
                 break;
             }
@@ -745,12 +745,12 @@ void scanSegments(in ref dl_phdr_info info, DSO* pdso) nothrow @nogc
         case PT_LOAD:
             if (phdr.p_flags & PF_W) // writeable data segment
             {
-                auto beg = cast(void*)(info.dlpi_addr + phdr.p_vaddr);
+                auto beg = cast(void*)(info.dlpi_addr + (phdr.p_vaddr & ~(size_t.sizeof - 1)));
                 pdso._gcRanges.insertBack(beg[0 .. phdr.p_memsz]);
             }
             version (Shared) if (phdr.p_flags & PF_X) // code segment
             {
-                auto beg = cast(void*)(info.dlpi_addr + phdr.p_vaddr);
+                auto beg = cast(void*)(info.dlpi_addr + (phdr.p_vaddr & ~(size_t.sizeof - 1)));
                 pdso._codeSegments.insertBack(beg[0 .. phdr.p_memsz]);
             }
             break;