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loader: consolidate eager symbol resolution and remove dead PLT machinery

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This commit is contained in:
nmzik
2026-09-25 20:25:34 +04:00
parent 1371219f5c
commit e056d55dd5
3 changed files with 59 additions and 391 deletions
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src/loader/jit.h
-47
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@@ -7,53 +7,6 @@ namespace Loader::Jit {
#pragma pack(1)
struct JmpWithIndex {
void SetIndex(uint32_t index) { *reinterpret_cast<uint32_t*>(&code[1]) = index; }
void SetFunc(void* handler) {
auto func_addr = reinterpret_cast<int64_t>(handler);
auto rip_addr = reinterpret_cast<int64_t>(&code[10]);
auto offset64 = func_addr - rip_addr;
auto offset32 = static_cast<uint32_t>(static_cast<uint64_t>(offset64) & 0xffffffffu);
*reinterpret_cast<uint32_t*>(&code[6]) = offset32;
}
static uint64_t GetSize() { return 16; }
// 68 00 00 00 00 push <index>
// E9 E0 FF FF FF jmp <handler>
uint8_t code[16] = {0x68, 0x00, 0x00, 0x00, 0x00, 0xE9, 0x00, 0x00,
0x00, 0x00, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90};
};
struct CallPlt {
explicit CallPlt(uint32_t table_size) {
for (uint32_t index = 0; index < table_size; index++) {
auto* c = new (&code[32] + JmpWithIndex::GetSize() * index) JmpWithIndex;
c->SetIndex(index);
c->SetFunc(this);
}
}
void SetPltGot(uint64_t vaddr) { *reinterpret_cast<uint64_t*>(&code[2]) = vaddr; }
uint64_t GetAddr(uint32_t index) {
return reinterpret_cast<uint64_t>(&code[32] + JmpWithIndex::GetSize() * index);
}
static uint64_t GetSize(uint32_t table_size) {
return 32 + JmpWithIndex::GetSize() * table_size;
}
// 0: 49 bb 88 77 66 55 44 movabs r11,0x1122334455667788
// 7: 33 22 11
// a: 41 ff 73 08 push QWORD PTR [r11+0x8]
// e: 41 ff 63 10 jmp QWORD PTR [r11+0x10]
uint8_t code[32] = {0x49, 0xBB, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x41, 0xFF,
0x73, 0x08, 0x41, 0xFF, 0x63, 0x10, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90};
};
struct JmpRax {
template <class Handler>
void SetFunc(Handler func) {