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Remove useless rax preserve across callq

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vaxerski
2023-02-27 19:47:42 +00:00
parent 03d7651916
commit 18229043fa
1 changed files with 2 additions and 4 deletions
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6
src/plugins/HookSystem.cpp
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@@ -82,15 +82,13 @@ bool CFunctionHook::hook() {
// nop // nop
static constexpr uint8_t NOP = 0x90; static constexpr uint8_t NOP = 0x90;
/* /*
pushq %rax
movabs $0,%rax movabs $0,%rax
callq *%rax callq *%rax
popq %rax
offset for addr: 3 offset for addr: 3
*/ */
static constexpr uint8_t CALL_WITH_RAX[] = {0x50, 0x48, 0xB8, 0xEF, 0xBE, 0xAD, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x10, 0x58}; static constexpr uint8_t CALL_WITH_RAX[] = {0x48, 0xB8, 0xEF, 0xBE, 0xAD, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x10};
static constexpr size_t CALL_WITH_RAX_ADDRESS_OFFSET = 3; static constexpr size_t CALL_WITH_RAX_ADDRESS_OFFSET = 2;
// get minimum size to overwrite // get minimum size to overwrite
const auto HOOKSIZE = probeMinimumJumpSize(m_pSource, sizeof(ABSOLUTE_JMP_ADDRESS) + sizeof(PUSH_RAX) + sizeof(POP_RAX)); const auto HOOKSIZE = probeMinimumJumpSize(m_pSource, sizeof(ABSOLUTE_JMP_ADDRESS) + sizeof(PUSH_RAX) + sizeof(POP_RAX));