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Fix trampoline on 32bit abi (#1494)

This commit is contained in:
LoveSy 2021-12-25 00:22:14 +08:00 committed by GitHub
parent ca1549c2d9
commit 946ff240a8
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 9 deletions
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16
core/src/main/cpp/external/yahfa/src/trampoline.cpp vendored
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@ -20,11 +20,8 @@
static_assert(std::endian::native == std::endian::little, "Unsupported architecture");
union Trampoline {
uintptr_t mixed;
struct {
unsigned count : 12;
uintptr_t addr : sizeof(uintptr_t) * CHAR_BIT - 12;
};
uintptr_t addr;
unsigned count : 12;
};
static_assert(sizeof(Trampoline) == sizeof(uintptr_t), "Unsupported architecture");
@ -58,7 +55,7 @@ unsigned char trampoline[] = "\x00\x00\x9f\xe5\x20\xf0\x90\xe5\x78\x56\x34\x12";
// 78 56 34 12 ; 0x1234567812345678 (addr of the hook method)
unsigned char trampoline[] = "\x60\x00\x00\x58\x10\x00\x40\xf8\x00\x02\x1f\xd6\x78\x56\x34\x12\x78\x56\x34\x12";
#endif
static std::atomic_uintptr_t trampoline_pool{Trampoline{.count = 0, .addr = 0}.mixed};
static std::atomic_uintptr_t trampoline_pool{0};
static std::atomic_flag trampoline_lock{false};
static constexpr size_t trampolineSize = roundUpToPtrSize(sizeof(trampoline));
static constexpr size_t pageSize = 4096;
@ -72,9 +69,9 @@ void *genTrampoline(void *hookMethod) {
unsigned count;
uintptr_t addr;
while (true) {
auto tl = Trampoline {.mixed = trampoline_pool.fetch_add(1, std::memory_order_release)};
auto tl = Trampoline {.addr = trampoline_pool.fetch_add(1, std::memory_order_release)};
count = tl.count;
addr = tl.addr;
addr = tl.addr & ~uintptr_t(0xfff);
if (addr == 0 || count >= trampolineNumPerPage) {
if (trampoline_lock.test_and_set(std::memory_order_acq_rel)) {
trampoline_lock.wait(true, std::memory_order_acquire);
@ -92,11 +89,12 @@ void *genTrampoline(void *hookMethod) {
count = 0;
tl.addr = addr;
tl.count = count + 1;
trampoline_pool.store(tl.mixed, std::memory_order_release);
trampoline_pool.store(tl.addr, std::memory_order_release);
trampoline_lock.clear(std::memory_order_release);
trampoline_lock.notify_all();
}
}
LOGI("trampoline: count = %u, addr = %zx, target = %zx", count, addr, addr + count * trampolineSize);
addr = addr + count * trampolineSize;
break;
}