To start with the FPC port for x86-64, I've objdumped an empty C prg on an x86-64, and read the abi document on x86-64.org, but don't understand the move rcx,r10 before each syscall.
Why is this done? What is exactly saved? If it is a save, where is it restored from r10? E.g. 0000000000402094 <__sys_sigaction>: 402094: 48 c7 c0 a0 01 00 00 mov $0x1a0,%rax 40209b: 49 89 ca mov %rcx,%r10 <- This one 40209e: 0f 05 syscall 4020a0: 72 01 jb 4020a3 <__sys_sigaction+0xf> 4020a2: c3 retq I did notice that the x86-64 linux abi mentions rcx as being destroyed by the kernel. _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
