Date: Wed, 17 Aug 2005 21:14:15 +0530 From: Joseph Koshy <joseph.koshy@gmail.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: hackers@freebsd.org Subject: Re: hello world but not in 32bit x86 but in amd64 for amd64 platform Message-ID: <84dead7205081708447a981452@mail.gmail.com> In-Reply-To: <20050817145510.GD26422@dan.emsphone.com> References: <20050817122049.29529.qmail@web52009.mail.yahoo.com> <20050817145510.GD26422@dan.emsphone.com>
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av> "Hello World" assembly program written in 64bit assembly
av> which I can compile and run on my FreeBSD,AMD64 platform
You could also look at "src/lib/libc/amd64/SYS.h" for how
system calls are implemented. In particular,
#define KERNCALL movq %rcx, %r10; syscall
A system call transfers control to:=20
"src/sys/amd46/amd64/exception.S":
... snip ...
IDTVEC(fast_syscall)
swapgs
movq %rsp,PCPU(SCRATCH_RSP)
movq PCPU(RSP0),%rsp
... etc ...
The x86-64 ABI is defined in:
http://x86-64.org/documentation/abi.pdf
--=20
FreeBSD Volunteer, http://people.freebsd.org/~jkoshy
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