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In particular, 64-bit system call arguments use up two register_t arguments for 32-bit processes. They must also be aligned on a 64-bit boundary on 32-bit powerpc processes. This fixes the decoding of lseek(), procctl(), and wait6() arguments for 32-bit processes (both native and via freebsd32). Note that the ktrace system call return record only returns a single register, so the return value of lseek is always truncated to the low 32-bits for 32-bit processes.
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