fat.lst

au1200下的boot代码

 537              		.type	getNextCluster, @function
 538              	getNextCluster:
 539              	$LFB5:
 223:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 224:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** int getNextCluster(int currentCluster)
 225:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** {
 540              		.loc 1 225 0
 541              		.frame	$sp,48,$31		# vars= 0, regs= 7/0, args= 16, gp= 0
 542              		.mask	0x803f0000,-8
 543              		.fmask	0x00000000,0
 544              		.set	noreorder
 545              		.set	nomacro
 546              		
 547 036c D0FFBD27 		addiu	$sp,$sp,-48
 548              	$LCFI11:
 226:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	int FATOffset, ThisFATSecNum, ThisFATEntOffset, next;
 227:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	next = 0;
 228:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 229:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	switch(fat.type)
 549              		.loc 1 229 0
 550 0370 0000063C 		lui	$6,%hi(fat)
 551              		.loc 1 225 0
 552 0374 2400B5AF 		sw	$21,36($sp)
 553              	$LCFI12:
 554 0378 2000B4AF 		sw	$20,32($sp)
 555              	$LCFI13:
 556              		.loc 1 229 0
 557 037c 0000C224 		addiu	$2,$6,%lo(fat)
 558              		.loc 1 225 0
 559 0380 2800BFAF 		sw	$31,40($sp)
 560              	$LCFI14:
 561 0384 1C00B3AF 		sw	$19,28($sp)
 562              	$LCFI15:
 563 0388 1800B2AF 		sw	$18,24($sp)
 564              	$LCFI16:
 565 038c 1400B1AF 		sw	$17,20($sp)
 566              	$LCFI17:
 567 0390 1000B0AF 		sw	$16,16($sp)
 568              	$LCFI18:
 569              		.loc 1 229 0
 570 0394 3402438C 		lw	$3,564($2)
 571 0398 02000224 		li	$2,2			# 0x2
 572              		.loc 1 225 0
 573 039c 21A88000 		move	$21,$4
 574              		.loc 1 227 0
 575              		.loc 1 229 0
 576 03a0 52006210 		beq	$3,$2,$L36
 577 03a4 21A00000 		move	$20,$0
 578              	
 579 03a8 0300622C 		sltu	$2,$3,3
 580 03ac 2D004014 		bne	$2,$0,$L49
 581 03b0 01000224 		li	$2,1			# 0x1
 582              	
 583 03b4 03000224 		li	$2,3			# 0x3
GAS LISTING /tmp/ccZKkRKo.s 			page 17


 584 03b8 78006210 		beq	$3,$2,$L37
 585 03bc 00000000 		nop
 586              	
 587              	$L34:
 230:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	{
 231:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT12: FATOffset = currentCluster * 3 / 2; break;
 232:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT16: FATOffset = currentCluster * 2; break;
 233:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT32: FATOffset = currentCluster * 4; break;
 234:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	}
 235:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 236:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	ThisFATSecNum = fat.reservedSectorCount + (FATOffset / fat.bytesPerSector);
 588              		.loc 1 236 0
 589 03c0 0000D124 		addiu	$17,$6,%lo(fat)
 590              	$L52:
 591 03c4 0002228E 		lw	$2,512($17)
 592 03c8 0402238E 		lw	$3,516($17)
 237:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	ThisFATEntOffset = FATOffset % fat.bytesPerSector;
 238:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 239:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	if(fatCachedSector != ThisFATSecNum)	//is FAT sector cached?
 593              		.loc 1 239 0
 594 03cc 0000123C 		lui	$18,%hi(fatCachedSector)
 595              		.loc 1 236 0
 596 03d0 1A00A200 		div	$0,$5,$2
 597 03d4 02004014 		bne	$2,$0,1f
 598 03d8 00000000 		nop
 599 03dc 0D000700 		break	7
 600              	1:
 601              		.loc 1 239 0
 602 03e0 0000448E 		lw	$4,%lo(fatCachedSector)($18)
 603              		.loc 1 236 0
 604 03e4 12100000 		mflo	$2
 605 03e8 21806200 		addu	$16,$3,$2
 606 03ec 10980000 		mfhi	$19
 240:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	{		
 241:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		fatDiskFunctions.read(fat.rootSector + ThisFATSecNum, 1, (void*)fatTableCache);	//read FAT table 
 607              		.loc 1 241 0
 608              		.loc 1 239 0
 609 03f0 0A009010 		beq	$4,$16,$L39
 610 03f4 0000033C 		lui	$3,%hi(fatDiskFunctions+8)
 611              	
 612              		.loc 1 241 0
 613 03f8 3C02248E 		lw	$4,572($17)
 614 03fc 0800628C 		lw	$2,%lo(fatDiskFunctions+8)($3)
 615 0400 0000063C 		lui	$6,%hi(fatTableCache)
 616 0404 21209000 		addu	$4,$4,$16
 617 0408 0000C624 		addiu	$6,$6,%lo(fatTableCache)
 618 040c 09F84000 		jal	$2
 619 0410 01000524 		li	$5,1			# 0x1
 620              	
 242:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		fatCachedSector = ThisFATSecNum;
 621              		.loc 1 242 0
 622 0414 21200002 		move	$4,$16
 623 0418 000050AE 		sw	$16,%lo(fatCachedSector)($18)
 624              	$L39:
 243:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	}
 244:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 245:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	switch(fat.type)
GAS LISTING /tmp/ccZKkRKo.s 			page 18


 625              		.loc 1 245 0
 626 041c 3402238E 		lw	$3,564($17)
 627 0420 02000224 		li	$2,2			# 0x2
 628 0424 33006210 		beq	$3,$2,$L46
 629 0428 0300622C 		sltu	$2,$3,3
 630              	
 631 042c 15004010 		beq	$2,$0,$L48
 632 0430 03000224 		li	$2,3			# 0x3
 633              	
 634 0434 01000224 		li	$2,1			# 0x1
 246:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	{
 247:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT12:
 248:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			if(ThisFATEntOffset == (fat.bytesPerSector - 1))
 249:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			{
 250:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				next = fatTableCache[ThisFATEntOffset] & 0x0ff;
 251:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				fatCachedSector++;
 252:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				fatDiskFunctions.read(fat.rootSector + fatCachedSector, 1, (void*)fatTableCache);
 253:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				next |= (fatTableCache[0] & 0x0ff) << 8;
 254:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			}
 255:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			else
 256:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			{
 257:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				next = ((fatTableCache[ThisFATEntOffset+1] & 0x0ff) << 8) | (fatTableCache[ThisFATEntOffset] & 
 258:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			}
 259:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			if(currentCluster & 1)
 260:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				next >>= 4;
 261:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			else
 262:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 				next &= 0x0fff;
 263:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			break;
 264:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT16:
 265:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			next = ((fatTableCache[ThisFATEntOffset+1] & 0x0ff) << 8) | (fatTableCache[ThisFATEntOffset] & 0
 266:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			break;
 267:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 		case FAT32:
 268:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			next = ((fatTableCache[ThisFATEntOffset+3] & 0x00f) << 24) | ((fatTableCache[ThisFATEntOffset+2]
 269:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 			break;
 270:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	}
 271:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 
 272:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** 	return next;
 273:/mnt/hgfs/boot/booter/source/applications/booter/fat.c **** }
 635              		.loc 1 273 0
 636              		.loc 1 245 0
 637 0438 3F006210 		beq	$3,$2,$L41
 638 043c 21108002 		move	$2,$20
 639              	
 640              	$L53:
 641              		.loc 1 273 0
 642 0440 2800BF8F 		lw	$31,40($sp)
 643 0444 2400B58F 		lw	$21,36($sp)
 644 0448 2000B48F 		lw	$20,32($sp)
 645 044c 1C00B38F 		lw	$19,28($sp)
 646 0450 1800B28F 		lw	$18,24($sp)
 647 0454 1400B18F 		lw	$17,20($sp)
 648 0458 1000B08F 		lw	$16,16($sp)
 649 045c 0800E003 		j	$31
 650 0460 3000BD27 		addiu	$sp,$sp,48
 651              	
 652              	$L49:
 653              		.loc 1 236 0
GAS LISTING /tmp/ccZKkRKo.s 			page 19


 654              		.loc 1 229 0
 655 0464 D7FF6214 		bne	$3,$2,$L52
 656 0468 0000D124 		addiu	$17,$6,%lo(fat)
 657              	
 658              		.loc 1 231 0
 659 046c 40100400 		sll	$2,$4,1
 660 0470 21104400 		addu	$2,$2,$4
 661 0474 C21F0200 		srl	$3,$2,31
 662 0478 21104300 		addu	$2,$2,$3
 663 047c F1000008 		j	$L52
 664 0480 43280200 		sra	$5,$2,1
 665              	
 666              	$L48:
 667              		.loc 1 273 0
 668              		.loc 1 245 0
 669 0484 EEFF6214 		bne	$3,$2,$L53
 670 0488 21108002 		move	$2,$20
 671              	
 672              		.loc 1 268 0
 673 048c 0000023C 		lui	$2,%hi(fatTableCache)
 674 0490 00004224 		addiu	$2,$2,%lo(fatTableCache)
 675 0494 21106202 		addu	$2,$19,$2
 676 0498 03004390 		lbu	$3,3($2)
 677 049c 02004490 		lbu	$4,2($2)
 678 04a0 01004590 		lbu	$5,1($2)
 679 04a4 0F006330 		andi	$3,$3,0xf
 680 04a8 00004690 		lbu	$6,0($2)
 681 04ac 001E0300 		sll	$3,$3,24
 682 04b0 00240400 		sll	$4,$4,16
 683 04b4 25186400 		or	$3,$3,$4
 684 04b8 002A0500 		sll	$5,$5,8
 685 04bc 25186500 		or	$3,$3,$5
 686 04c0 25A06600 		or	$20,$3,$6
 687              		.loc 1 273 0
 688 04c4 21108002 		move	$2,$20
 689 04c8 2800BF8F 		lw	$31,40($sp)
 690 04cc 2400B58F 		lw	$21,36($sp)
 691 04d0 2000B48F 		lw	$20,32($sp)
 692 04d4 1C00B38F 		lw	$19,28($sp)
 693 04d8 1800B28F 		lw	$18,24($sp)
 694 04dc 1400B18F 		lw	$17,20($sp)
 695 04e0 1000B08F 		lw	$16,16($sp)
 696 04e4 0800E003 		j	$31
 697 04e8 3000BD27 		addiu	$sp,$sp,48
 698              	
 699              	$L36:
 700              		.loc 1 232 0
 701 04ec F0000008 		j	$L34
 702 04f0 40280400 		sll	$5,$4,1
 703              	
 704              	$L46:
 705              		.loc 1 265 0
 706 04f4 0000023C 		lui	$2,%hi(fatTableCache)
 707 04f8 00004224 		addiu	$2,$2,%lo(fatTableCache)
 708 04fc 21106202 		addu	$2,$19,$2
 709 0500 01004390 		lbu	$3,1($2)
 710 0504 00004490 		lbu	$4,0($2)
GAS LISTING /tmp/ccZKkRKo.s 			page 20


 711              		.loc 1 273 0
 712 0508 2800BF8F 		lw	$31,40($sp)
 713              		.loc 1 265 0
 714 050c 001A0300 		sll	$3,$3,8
 715 0510 25A06400 		or	$20,$3,$4
 716              		.loc 1 273 0
 717 0514 21108002 		move	$2,$20
 718 0518 2400B58F 		lw	$21,36($sp)
 719 051c 2000B48F 		lw	$20,32($sp)
 720 0520 1C00B38F 		lw	$19,28($sp)
 721 0524 1800B28F 		lw	$18,24($sp)
 722 0528 1400B18F 		lw	$17,20($sp)
 723 052c 1000B08F 		lw	$16,16($sp)
 724 0530 0800E003 		j	$31
 725 0534 3000BD27 		addiu	$sp,$sp,48
 726              	
 727              	$L41:
 728              		.loc 1 248 0
 729 0538 0002228E 		lw	$2,512($17)
 730 053c FFFF4224 		addiu	$2,$2,-1
 731              		.loc 1 257 0
 732              		.loc 1 248 0
 733 0540 18005310 		beq	$2,$19,$L50
 734 0544 0000023C 		lui	$2,%hi(fatTableCache)
 735              	
 736              		.loc 1 257 0
 737 0548 00004224 		addiu	$2,$2,%lo(fatTableCache)
 738 054c 21106202 		addu	$2,$19,$2
 739 0550 01004390 		lbu	$3,1($2)
 740 0554 00004490 		lbu	$4,0($2)
 741 0558 001A0300 		sll	$3,$3,8
 742 055c 25A06400 		or	$20,$3,$4
 743              		.loc 1 260 0
 744 0560 03111400 		sra	$2,$20,4
 745 0564 FF0F8332 		andi	$3,$20,0xfff
 746              		.loc 1 259 0
 747 0568 0100A432 		andi	$4,$21,0x1
 748              		.loc 1 260 0
 749 056c 21A04000 		move	$20,$2
 750 0570 0AA06400 		movz	$20,$3,$4
 751              	$L51:
 752              		.loc 1 273 0
 753 0574 21108002 		move	$2,$20
 754 0578 2800BF8F 		lw	$31,40($sp)
 755 057c 2400B58F 		lw	$21,36($sp)
 756 0580 2000B48F 		lw	$20,32($sp)
 757 0584 1C00B38F 		lw	$19,28($sp)
 758 0588 1800B28F 		lw	$18,24($sp)
 759 058c 1400B18F 		lw	$17,20($sp)
 760 0590 1000B08F 		lw	$16,16($sp)
 761 0594 0800E003 		j	$31
 762 0598 3000BD27 		addiu	$sp,$sp,48
 763              	
 764              	$L37:
 765              		.loc 1 233 0
 766 059c F0000008 		j	$L34
 767 05a0 80280400 		sll	$5,$4,2
GAS LISTING /tmp/ccZKkRKo.s 			page 21


 768              	
 769              	$L50:
 770              		.loc 1 252 0
 771 05a4 3C02258E 		lw	$5,572($17)
 772 05a8 0000033C 		lui	$3,%hi(fatDiskFunctions+8)