From 17aa7971da2396b8ec489c7f9c3fd975bce743eb Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Wed, 15 Nov 2017 19:30:24 +0000
Subject: [PATCH] JIT: use MAP_32BIT on Linux and FreeBSD

Unless RLIMIT_DATA is low enough FreeBSD by default reserves lower 2Gb
for brk(2) style heap, ignoring mmap(2) address hint requested by RPCS3.
Passing MAP_32BIT fixes the following crash

Assertion failed: ((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) || (Type == ELF::R_X86_64_32S && ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN))), function resolveX86_64Relocation, file /usr/ports/devel/llvm40/work/llvm-4.0.1.src/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp, line 287.
---
 Utilities/JIT.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Utilities/JIT.cpp b/Utilities/JIT.cpp
index f9bfd7d390..7e3bd23f5b 100644
--- a/Utilities/JIT.cpp
+++ b/Utilities/JIT.cpp
@@ -30,6 +30,8 @@
 
 #ifdef _WIN32
 #include <Windows.h>
+#else
+#include <sys/mman.h>
 #endif
 
 #include "JIT.h"
@@ -47,6 +49,11 @@ static void* const s_memory = []() -> void*
 	llvm::InitializeNativeTargetAsmPrinter();
 	LLVMLinkInMCJIT();
 
+#ifdef MAP_32BIT
+	auto ptr = ::mmap(nullptr, s_memory_size, PROT_NONE, MAP_ANON | MAP_PRIVATE | MAP_32BIT, -1, 0);
+	if (ptr != MAP_FAILED)
+		return ptr;
+#else
 	for (u64 addr = 0x10000000; addr <= 0x80000000 - s_memory_size; addr += 0x1000000)
 	{
 		if (auto ptr = utils::memory_reserve(s_memory_size, (void*)addr))
@@ -54,6 +61,7 @@ static void* const s_memory = []() -> void*
 			return ptr;
 		}
 	}
+#endif
 
 	return utils::memory_reserve(s_memory_size);
 }();