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Remove ARMv7 A32 reliance on ELF global offset table

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This commit is contained in:
Katy Coe
2019-10-26 13:56:19 +02:00
parent 2236764715
commit 3a66e59447
1 changed files with 20 additions and 17 deletions
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37
Il2CppInspector/Il2CppBinaryARM.cs
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@@ -19,27 +19,30 @@ namespace Il2CppInspector
protected override (ulong, ulong) ConsiderCode(IFileFormatReader image, uint loc) {
// Assembly bytes to search for at start of each function
ulong metadataRegistration, codeRegistration;
byte[] buff;
// ARMv7
// void Il2CppCodegenRegistration() (not available in the symbol table of later versions)
var bytes = new byte[] { 0x1c, 0x0, 0x9f, 0xe5, 0x1c, 0x10, 0x9f, 0xe5, 0x1c, 0x20, 0x9f, 0xe5 };
// ARMv7 based on ELF GOT
// Il2CppCodeRegistration.cpp initializer
image.Position = loc;
buff = image.ReadBytes(12);
if (bytes.SequenceEqual(buff)) {
image.Position = loc + 0x2c;
var subaddr = image.ReadUInt32() + image.GlobalOffset;
image.Position = (uint) (subaddr + 0x28);
codeRegistration = image.ReadUInt32() + image.GlobalOffset;
image.Position = (uint) (subaddr + 0x2C);
var ptr = image.ReadUInt32() + image.GlobalOffset;
image.Position = image.MapVATR(ptr);
metadataRegistration = image.ReadUInt32();
var buff = image.ReadBytes(0xc);
// LDR R0, [PC, #0x1C]; LDR R1, [PC, #0x1C]; LDR R2, [PC, #0x1C]
if (new byte[] { 0x1c, 0x0, 0x9f, 0xe5, 0x1c, 0x10, 0x9f, 0xe5, 0x1c, 0x20, 0x9f, 0xe5 }.SequenceEqual(buff)) {
// Get offset to all addresses
var offset = image.ReadUInt32(loc + 0x24) + loc + 0xc + 8;
// Get pointer to Il2CppCodegenRegistration(void)
var pCgr = image.ReadUInt32(loc + 0x2C) + offset;
// Read pointer table at end of function
codeRegistration = image.ReadUInt32(pCgr + 0x28) + offset;
var pMetadataRegistration = image.ReadUInt32(pCgr + 0x2C) + offset;
metadataRegistration = image.ReadUInt32(pMetadataRegistration);
return (codeRegistration, metadataRegistration);
}
// ARMv7 metadata v24
// void Il2CppCodeRegistration()
// ARMv7
// Il2CppCodeRegistration.cpp initializer
image.Position = loc;
buff = image.ReadBytes(0x18);
@@ -90,7 +93,7 @@ namespace Il2CppInspector
// ARMv7 Thumb (T1)
// http://liris.cnrs.fr/~mmrissa/lib/exe/fetch.php?media=armv7-a-r-manual.pdf - A8.8.106
// http://armconverter.com/hextoarm/
bytes = new byte[] { 0x2d, 0xe9, 0x00, 0x48, 0xeb, 0x46 };
var bytes = new byte[] { 0x2d, 0xe9, 0x00, 0x48, 0xeb, 0x46 };
image.Position = loc;
buff = image.ReadBytes(6);
if (!bytes.SequenceEqual(buff))