To: djgpp AT delorie DOT com
Date: Sat, 25 Jan 1997 18:10:51 c:\
Subject: AT&T assembly code won't compile
Message-ID: <19970125.171134.4439.2.aclemmer@juno.com>
From: aclemmer AT juno DOT com (Aaron M Clemmer)

When I try to compile this code, it tells me "not a known 386
instruction".  I don't know which two lines they are (I'm using RHIDE),
but that the error messages were for two adjacent lines of code.  Why it
doesn't work, I don't know, it seems to be valid assembly code...

As I am no longer subscribing to the mailing list (my email is long
distance now...),  please reply to my email address, or I will never see
any replies.  =)

Thanks,
Aaron (aclemmer AT juno DOT com)


void flipBanked(unsigned char *bufPtr, unsigned long numBanks, unsigned
long lastBytes)
	// As you may have guessed, this *should* copy a buffer to a
banked video 	// card.
	// ES:DI -> vga
	// DS:SI -> memory block to Blt
	// DH = number of full banks to fill
	// ECX = lastBytes
	__asm__ __volatile__ (
	"pusha			\n"
	"movl %%ebx, %%ds	\n" // load up the values in the
	"movl %%eax, %%es	\n" // segment regs.
	"xor %%edi, %%edi	 	\n" // clear edi
	"xor %%dl, %%dl 		\n" // and dl.
	"or %%dh, %%dh 		\n" // see if the is
	"jz DoPartial 		\n" // only a single bank to
handle.
"OuterLoop: nop			\n" // Move all of the full 64k
banks first.
	"movb %%dl, %%al 		\n"
	"call setBank 		\n"
	"movl $0x4000, %%ecx	\n" // Need to set 4000h DWORDS per
bank
	"rep			\n" // I know the above line causes
	"movsl			\n" // DoPartial to not work, but I
was
	"xor %%di, %%di		\n" // planning on fixing it when
this
	"incb %%dl		\n" // compiles
	"decb %%dh		\n"
	"jnz OuterLoop 		\n"
"DoPartial: nop			\n" // Now fill the last partial
bank
	"movb %%dl, %%al		\n"
	"call setBank 		\n"
	"shrw $2, %%cx 		\n"
	"rep			\n"
	"movsl			\n"
	"popa 			   "
	:
	: "a" ( 0xA0000 ), // AX
	"b" ( RM_SEGMENT( (unsigned long)bufPtr) ), // BX
 	"S" ( RM_OFFSET ( (unsigned long)bufPtr) ), // SI
	"d" ( numBanks ), // DX
 	"c" ( lastBytes ) // CX
	);
}