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LibC: Communicate malloc() and free() operations to UserspaceEmulator
Use the sneaky SALC secret mechanism of UserspaceEmulator to inform it about malloc operations.
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2 changed files with 24 additions and 0 deletions
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@ -70,4 +70,21 @@ int perf_event(int type, uintptr_t arg1, uintptr_t arg2);
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int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size);
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ALWAYS_INLINE void send_secret_data_to_userspace_emulator(uintptr_t data1, uintptr_t data2, uintptr_t data3)
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{
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asm volatile(
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".byte 0xd6\n"
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".byte 0xd6\n" ::
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: "eax");
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asm volatile(
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"push %%eax\n"
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"push %%ecx\n"
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"push %%edx\n"
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"pop %%edx\n"
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"pop %%ecx\n"
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"pop %%eax\n" ::"a"(data1),
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"c"(data2), "d"(data3)
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: "memory");
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}
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__END_DECLS
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