Date: Thu, 18 Oct 2007 12:38:06 -0700 From: Yuri <yuri@rawbw.com> To: Derek Ragona <derek@computinginnovations.com> Cc: freebsd-questions@freebsd.org Subject: Re: Calling syscalls through int 0x80 documentation? Message-ID: <1192736286.4717b61e1dcc0@webmail.rawbw.com> In-Reply-To: <6.0.0.22.2.20071018141850.02482e78@mail.computinginnovations.com> References: <1192731161.4717a21980065@webmail.rawbw.com> <6.0.0.22.2.20071018132410.02311ad8@mail.computinginnovations.com> <1192733243.4717aa3b1843f@webmail.rawbw.com> <6.0.0.22.2.20071018141850.02482e78@mail.computinginnovations.com>
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By experimenting I found the working version now. I still don't understand why first element on stack while going into 'int 0x80' should be stack pointer. asm( ".text\n" "mysyscall:\n" " movl %esp,%eax\n" " push 28(%eax)\n" " push 24(%eax)\n" " push 20(%eax)\n" " push 16(%eax)\n" " push 12(%eax)\n" " push 8(%eax)\n" " push %eax\n" " movl 4(%eax), %eax\n" " int $0x80\n" " pop %ecx\n" " pop %ecx\n" " pop %ecx\n" " pop %ecx\n" " pop %ecx\n" " pop %ecx\n" " pop %ecx\n" " ret\n" ".previous\n" );
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