MoonchildProductions#1251 - Part 23: Allow AMD64 build to work.

https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Compiling_32-bit_Firefox_on_a_Linux_64-bit_OS

Setting this up turned out to be easier than I thought it would be. All I had to do was apply these instructions in reverse and add the following to my .mozconfig file:

CC="gcc -m64"
CXX="g++ -m64"
AS="gas --64"
ac_add_options --target=x86_64-pc-solaris2.11
export PKG_CONFIG_PATH=/usr/lib/amd64/pkgconfig
ac_add_options --libdir=/usr/lib/amd64
ac_add_options --x-libraries=/usr/lib/amd64

Most of these changes were fairly trivial, just requiring me to make a few of the changes I made earlier conditional on a 32-bit build. The biggest challenge was figuring out why the JavaScript engine triggered a segfault everytime it tried to allocate memory. But this patch fixes it:

https://github.com/OpenIndiana/oi-userland/blob/oi/hipster/components/web/firefox/patches/patch-js_src_gc_Memory.cpp.patch

Turns out that Solaris on AMD64 handles memory management in a fairly unusual way with a segmented memory model, but it's not that different from what we see on other 64-bit processors. In fact, I saw a SPARC crash for a similar reason, and noticed that it looked just like mine except the numbers in the first segment were reversed. Having played around with hex editors before, I had a feeling I might be dealing with a little-endian version of a big-endian problem, but I didn't expect that knowledge to actually yield an easy solution.

https://bugzilla.mozilla.org/show_bug.cgi?id=577056

https://www.oracle.com/technetwork/server-storage/solaris10/solaris-memory-135224.html

As far as I can tell, this was the last barrier to an AMD64 Solaris build of Pale Moon.

config/external/ffi/moz.build

@@ -64,13 +64,20 @@ else:
     if CONFIG['INTEL_ARCHITECTURE'] and CONFIG['OS_TARGET'] != 'SunOS':
         DEFINES['HAVE_AS_X86_PCREL'] = True
 
+# Which is why they apparently don't do this anymore on amd64.
+
+    if CONFIG['FFI_TARGET'] == 'X86_64' and CONFIG['OS_TARGET'] == 'SunOS':
+        DEFINES['HAVE_AS_X86_PCREL'] = True
+
     # Don't bother setting EH_FRAME_FLAGS on Windows.
     # Quoted defines confuse msvcc.sh, and the value isn't used there.
     if CONFIG['OS_TARGET'] != 'WINNT':
         # Solaris seems to require EH_FRAME to be writable even on x86.
         # It works fine most of the time and there's no rule against it, 
         # but it causes a lot of weird problems.
-        if CONFIG['FFI_TARGET'] == 'ARM' or CONFIG['OS_ARCH'] == 'SunOS':
+        if CONFIG['FFI_TARGET'] == 'ARM':
+            DEFINES['EH_FRAME_FLAGS'] = '"aw"'
+        elif CONFIG['FFI_TARGET'] == 'X86' and CONFIG['OS_TARGET'] == 'SunOS':
             DEFINES['EH_FRAME_FLAGS'] = '"aw"'
         else:
             DEFINES['EH_FRAME_FLAGS'] = '"a"'

config/external/nspr/pr/moz.build

@@ -62,6 +62,7 @@ elif CONFIG['OS_TARGET'] == 'SunOS':
     SOURCES += ['/nsprpub/pr/src/md/unix/solaris.c']
     if CONFIG['CPU_ARCH'] == 'x86_64':
         SOURCES += ['/nsprpub/pr/src/md/unix/os_SunOS_x86_64.s']
+        DEFINES['USE_64'] = True
     elif CONFIG['CPU_ARCH'] == 'x86':
         SOURCES += ['/nsprpub/pr/src/md/unix/os_SunOS_x86.s']
 elif CONFIG['OS_TARGET'] == 'WINNT':

ipc/chromium/src/base/message_pump_libevent.cc

@@ -24,7 +24,7 @@
 #include "mozilla/UniquePtr.h"
 
 // This macro checks that the _EVENT_SIZEOF_* constants defined in
-// ipc/chromiume/src/third_party/<platform>/event2/event-config.h are correct.
+// ipc/chromium/src/third_party/<platform>/event2/event-config.h are correct.
 #if defined(_EVENT_SIZEOF_SHORT)
 #define CHECK_EVENT_SIZEOF(TYPE, type) \
     static_assert(_EVENT_SIZEOF_##TYPE == sizeof(type), \

ipc/chromium/src/third_party/libevent/solaris/event2/event-config.h

@@ -417,11 +417,7 @@
 #define _EVENT_SIZEOF_LONG_LONG 8
 
 /* The size of `pthread_t', as computed by sizeof. */
-#ifdef __LP64__
-#define _EVENT_SIZEOF_PTHREAD_T 8
-#else
 #define _EVENT_SIZEOF_PTHREAD_T 4
-#endif
 
 /* The size of `short', as computed by sizeof. */
 #define _EVENT_SIZEOF_SHORT 2

js/src/gc/Memory.cpp

@@ -415,8 +415,15 @@ InitMemorySubsystem()
 static inline void*
 MapMemoryAt(void* desired, size_t length, int prot = PROT_READ | PROT_WRITE,
             int flags = MAP_PRIVATE | MAP_ANON, int fd = -1, off_t offset = 0)
+
+// Solaris manages 64-bit address space in a different manner from every other
+// AMD64 operating system, but fortunately the fix is the same one 
+// required for every operating system on 64-bit SPARC, Itanium, and ARM. 
+// Most people's intuition failed them here and they thought this couldn't
+// possibly be correct on AMD64, but for Solaris/illumos it is.	
+	
 {
-#if defined(__ia64__) || (defined(__sparc64__) && defined(__NetBSD__)) || defined(__aarch64__)
+#if defined(__ia64__) || (defined(__sparc64__) && defined(__NetBSD__)) || defined(__aarch64__) || (defined(__sun) && defined(__x86_64__))
     MOZ_ASSERT((0xffff800000000000ULL & (uintptr_t(desired) + length - 1)) == 0);
 #endif
     void* region = mmap(desired, length, prot, flags, fd, offset);
@@ -466,7 +473,7 @@ MapMemory(size_t length, int prot = PROT_READ | PROT_WRITE,
         return nullptr;
     }
     return region;
-#elif defined(__aarch64__)
+#elif defined(__aarch64__) || (defined(__sun) && defined(__x86_64__))
    /*
     * There might be similar virtual address issue on arm64 which depends on
     * hardware and kernel configurations. But the work around is slightly

xpcom/reflect/xptcall/md/unix/moz.build

@@ -53,7 +53,7 @@ if CONFIG['OS_ARCH'] == 'SunOS':
     if CONFIG['OS_TEST'] == 'x86_64':
             SOURCES += [
                 'xptcinvoke_asm_x86_64_unix.S',
-                'xptcinvoke_x86_64_unix.cpp',
+                'xptcinvoke_x86_64_solaris.cpp',
                 'xptcstubs_x86_64_linux.cpp'
             ]
     elif '86' in CONFIG['OS_TEST']:

xpcom/reflect/xptcall/md/unix/xptcinvoke_x86_64_solaris.cpp

@@ -0,0 +1,75 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Platform specific code to invoke XPCOM methods on native objects
+
+#include "xptcprivate.h"
+
+// 6 integral parameters are passed in registers, but 1 is |this| which isn't
+// considered here.
+const uint32_t GPR_COUNT = 5;
+
+// 8 floating point parameters are passed in SSE registers
+const uint32_t FPR_COUNT = 8;
+
+extern "C" void
+InvokeCopyToStack(uint64_t * gpregs, double * fpregs,
+                     uint32_t paramCount, nsXPTCVariant * s,
+                     uint64_t* d)
+{
+    uint32_t nr_gpr = 0u; // skip one GP register for 'that'
+    uint32_t nr_fpr = 0u;
+    uint64_t value = 0u;
+
+    for (uint32_t i = 0; i < paramCount; i++, s++) {
+        if (s->IsPtrData())
+            value = (uint64_t) s->ptr;
+        else {
+            switch (s->type) {
+            case nsXPTType::T_FLOAT:                                break;
+            case nsXPTType::T_DOUBLE:                               break;
+            case nsXPTType::T_I8:     value = s->val.i8;            break;
+            case nsXPTType::T_I16:    value = s->val.i16;           break;
+            case nsXPTType::T_I32:    value = s->val.i32;           break;
+            case nsXPTType::T_I64:    value = s->val.i64;           break;
+            case nsXPTType::T_U8:     value = s->val.u8;            break;
+            case nsXPTType::T_U16:    value = s->val.u16;           break;
+            case nsXPTType::T_U32:    value = s->val.u32;           break;
+            case nsXPTType::T_U64:    value = s->val.u64;           break;
+            case nsXPTType::T_BOOL:   value = s->val.b;             break;
+            case nsXPTType::T_CHAR:   value = s->val.c;             break;
+            case nsXPTType::T_WCHAR:  value = s->val.wc;            break;
+            default:                  value = (uint64_t) s->val.p;  break;
+            }
+        }
+
+        if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
+            if (nr_fpr < FPR_COUNT)
+                fpregs[nr_fpr++] = s->val.d;
+            else {
+                *((double *)d) = s->val.d;
+                d++;
+            }
+        }
+        else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
+            if (nr_fpr < FPR_COUNT)
+                // The value in %xmm register is already prepared to
+                // be retrieved as a float. Therefore, we pass the
+                // value verbatim, as a double without conversion.
+                fpregs[nr_fpr++] = s->val.d;
+            else {
+                *((float *)d) = s->val.f;
+                d++;
+            }
+        }
+        else {
+            if (nr_gpr < GPR_COUNT)
+                gpregs[nr_gpr++] = value;
+            else
+                *d++ = value;
+        }
+    }
+}

xpcom/string/nsTSubstring.h

@@ -9,7 +9,12 @@
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/IntegerTypeTraits.h"
 #include "mozilla/Span.h"
-#ifdef XP_SOLARIS
+
+// Solaris defines pid_t to be long on ILP32 and int on LP64. I checked in 
+// sys/types.h. AMD64 and SPARC64 builds don't need this fix at all, 
+// while all 32-bit builds do.
+
+#if defined(XP_SOLARIS) && !defined(__LP64__)
 #include <unistd.h>
 #endif
 
@@ -590,7 +595,7 @@ public:
     const char* fmt = aRadix == 10 ? "%d" : aRadix == 8 ? "%o" : "%x";
     AppendPrintf(fmt, aInteger);
   }
-#ifdef XP_SOLARIS
+#if defined(XP_SOLARIS) && !defined(__LP64__)
   void AppendInt(pid_t aInteger)
   { 
    AppendPrintf("%lu", aInteger);