hack1.c

#include "../../skse64_common/Relocation.h"
#include "../../skse64_common/SafeWrite.h"
#include "../../skse64_common/BranchTrampoline.h"
#include "../../xbyak/xbyak.h"

#include "../config.h"
#include "../../skse64/GameSettings.h"


namespace Hack0
{


    
#if 0
   SSE v1.5.62 Crash on loading prior save with Riverside Lodge
   To check [rsi+10h] is 0 or not
   
.text:0000000140429421 C3                             retn
.text:0000000140429422                ; ---------------------------------------------------------------------------
.text:0000000140429422
.text:0000000140429422                loc_140429422:                          ; CODE XREF: crash_sub_1404293C0+4Aj
.text:0000000140429422                                                        ; crash_sub_1404293C0+4Ej
.text:0000000140429422 48 85 DB                       test    rbx, rbx
.text:0000000140429425 74 26                          jz      short loc_14042944D

.text:0000000140429427 8B C8                          mov     ecx, eax
.text:0000000140429429 48 8B D3                       mov     rdx, rbx
.text:000000014042942C 48 8B 46 10                    mov     rax, [rsi+10h]
.text:0000000140429430 48 8B 0C C8                    mov     rcx, [rax+rcx*8]
.text:0000000140429434 48 8B 01                       mov     rax, [rcx]

.text:0000000140429437 48 8B 5C 24 30                 mov     rbx, [rsp+28h+arg_0]
.text:000000014042943C 48 8B 74 24 38                 mov     rsi, [rsp+28h+arg_8]
.text:0000000140429441 48 83 C4 20                    add     rsp, 20h
.text:0000000140429445 5F                             pop     rdi
.text:0000000140429446 48 FF A0 80 00+                jmp     qword ptr [rax+80h]
.text:000000014042944D                ; ---------------------------------------------------------------------------
.text:000000014042944D
.text:000000014042944D                loc_14042944D:                          ; CODE XREF: crash_sub_1404293C0+65j
.text:000000014042944D B0 01                          mov     al, 1
.text:000000014042944F
.text:000000014042944F                loc_14042944F:                          ; CODE XREF: crash_sub_1404293C0+36j
.text:000000014042944F 48 8B 5C 24 30                 mov     rbx, [rsp+28h+arg_0]
.text:0000000140429454 48 8B 74 24 38                 mov     rsi, [rsp+28h+arg_8]
.text:0000000140429459 48 83 C4 20                    add     rsp, 20h
.text:000000014042945D 5F                             pop     rdi
.text:000000014042945E C3                             retn

#endif

RelocAddr<uintptr_t> crashed_sub_loc1(0x00429427);
RelocAddr<uintptr_t> crashed_sub_loc2(0x0042944D);
    

    bool Patch()
    {
        _MESSAGE("- hack0 patches -");

        if (config::patch_hack0)
        {
        
                _MESSAGE("patch_hack0 enabled");
                struct Check_zero_code : Xbyak::CodeGenerator
                {
                    Check_zero_code(void * buf) : Xbyak::CodeGenerator(4096, buf)
                    {
                        mov(ecx, eax);
                        mov(rdx, rbx);
                        mov(rax, ptr[rsi+0x10]);
                        //
                        test(rax, rax);
                        jz("L_zero");
                        jmp(ptr[rip]);
                        dq(crashed_sub_loc1.GetUIntPtr() + 9);

                        L("L_zero");         
                        // return 1 (not eq)
                        jmp(ptr[rip]);
                        dq(crashed_sub_loc2.GetUIntPtr());
                    }
                };

                void *codeBuf = g_localTrampoline.StartAlloc();
                Check_zero_code code(codeBuf);
                g_localTrampoline.EndAlloc(code.getCurr());

                g_branchTrampoline.Write6Branch(crashed_sub_loc1.GetUIntPtr(), uintptr_t(code.getCode()));

            
            
        }

        _MESSAGE("success");
        return true;
    }
}