Rim/iw7-mod
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jump hook working, but asm bad?

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m
2024-01-05 21:32:57 -06:00
parent 8f72a0d870
commit 5bda17ffbf
5 changed files with 97 additions and 4 deletions
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14
src/client/component/gsc/script_extension.cpp
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@ -89,7 +89,7 @@ namespace gsc
}
}
void vm_call_builtin_function_internal(builtin_function func)
void vm_call_builtin_function_internal(int specific_function_id)
{
const auto function_id = get_function_id();
const auto custom = functions.contains(static_cast<std::uint16_t>(function_id));
@ -99,6 +99,7 @@ namespace gsc
return;
}
builtin_function func = func_table[specific_function_id];
if (func == nullptr)
{
scr_error(utils::string::va("builtin function \"%s\" doesn't exist", gsc_ctx->func_name(function_id).data()), true);
@ -110,8 +111,13 @@ namespace gsc
void vm_call_builtin_function_stub(utils::hook::assembler& a)
{
a.mov(rax, qword_ptr(0x6B22918_b)); // 7
a.mov(qword_ptr(0x6B183D0_b), rax); // 7
a.lea(eax, dword_ptr(rcx, -1)); // 3
a.mov(qword_ptr(0x6B22908_b), rsi); // 7
a.pushad64();
a.mov(rbx, qword_ptr(rdx, rax, 3));
a.mov(rcx, rax); // TODO: pass builtin_function or id, but is this the right ID???
a.call_aligned(vm_call_builtin_function_internal); // call with builtin_function
a.popad64();
@ -348,8 +354,8 @@ namespace gsc
utils::hook::set<uint32_t>(0xC0E5CE_b + 3,
static_cast<uint32_t>(reverse_b((&func_table))));
*/
utils::hook::nop(0xC0E5CE_b, 12);
utils::hook::jump(0xC0E5CE_b, utils::hook::assemble(vm_call_builtin_function_stub), true);
utils::hook::nop(0xC0E5BD_b, 24); // nop everything from the lea instruction to the jmp
utils::hook::far_jump<0x140000000>(0xC0E5BD_b, utils::hook::assemble(vm_call_builtin_function_stub));
utils::hook::inject(0xBFD5A1_b + 3, &func_table);
utils::hook::set<uint32_t>(0xBFD595_b + 2, sizeof(func_table));