From: "±θΗΠΑΦ" <kimguy00 AT orgio DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: problem in inline assembler
Date: Tue, 28 Aug 2001 16:56:41 +0900
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello !
I need a somebody's help.
Now I'm studing inline asm.
and I thought %0, %1, %2.. are just a kind of a mapping sequencely.
So I thought %0 is gate_addr, %1 is dpl, %2 is type
but I think it's doesn't work.

please help me
How can I understand a source stuff below.


#define _set_gate(gate_addr,type,dpl,addr) \
__asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
 "movw %2,%%dx\n\t" \
 "movl %%eax,%0\n\t" \
 "movl %%edx,%1" \
 :"=m" (*((long *) (gate_addr))), \
  "=m" (*(1+(long *) (gate_addr))) \
 :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
  "d" ((char *) (addr)),"a" (KERNEL_CS << 16) \
 :"ax","dx")