+// Memory map parameters used in application-to-shadow address calculation.
+// Offset = (Addr & ~AndMask) ^ XorMask
+// Shadow = ShadowBase + Offset
+// Origin = OriginBase + Offset
+struct MemoryMapParams {
+ uint64_t AndMask;
+ uint64_t XorMask;
+ uint64_t ShadowBase;
+ uint64_t OriginBase;
+};
+
+struct PlatformMemoryMapParams {
+ const MemoryMapParams *bits32;
+ const MemoryMapParams *bits64;
+};
+
+// i386 Linux
+static const MemoryMapParams LinuxMemoryMapParams32 = {
+ 0x000080000000, // AndMask
+ 0, // XorMask (not used)
+ 0, // ShadowBase (not used)
+ 0x000040000000, // OriginBase
+};
+
+// x86_64 Linux
+static const MemoryMapParams LinuxMemoryMapParams64 = {
+ 0x400000000000, // AndMask
+ 0, // XorMask (not used)
+ 0, // ShadowBase (not used)
+ 0x200000000000, // OriginBase
+};
+
+// i386 FreeBSD
+static const MemoryMapParams FreeBSDMemoryMapParams32 = {
+ 0x000180000000, // AndMask
+ 0x000040000000, // XorMask
+ 0x000020000000, // ShadowBase
+ 0x000700000000, // OriginBase
+};
+
+// x86_64 FreeBSD
+static const MemoryMapParams FreeBSDMemoryMapParams64 = {
+ 0xc00000000000, // AndMask
+ 0x200000000000, // XorMask
+ 0x100000000000, // ShadowBase
+ 0x380000000000, // OriginBase
+};
+
+static const PlatformMemoryMapParams LinuxMemoryMapParams = {
+ &LinuxMemoryMapParams32,
+ &LinuxMemoryMapParams64,
+};
+
+static const PlatformMemoryMapParams FreeBSDMemoryMapParams = {
+ &FreeBSDMemoryMapParams32,
+ &FreeBSDMemoryMapParams64,
+};
+