SliTaz Repositories

     1.1 --- a/syslinux/stuff/iso2exe/lzcom.S	Thu Dec 13 14:33:27 2012 +0100
     1.2 +++ b/syslinux/stuff/iso2exe/lzcom.S	Tue Feb 26 08:20:18 2019 +0100
     1.3 @@ -3,33 +3,78 @@
     1.4  	
     1.5  ORGCOM	=	0x100
     1.6  STKSZ	=	0x4000			// unlzma needs 16Kb
     1.7 -CODESZ	=	(0x10000-STKSZ)/2	//  max < 16 sectors = 32Kb
     1.8  
     1.9 +#undef	USE_CX_LOADER			// CX should be set by loader
    1.10 +#undef	SETUP_SS			// extends max code size from 47k to 63k
    1.11 +
    1.12 +#ifdef SETUP_SS
    1.13 +STKROOM = 256
    1.14 +#else
    1.15 +STKROOM = STKSZ
    1.16 +#endif
    1.17 +
    1.18 +CODESZ	=	(0x10000-STKROOM)/2	//  max < 16 sectors = 32Kb
    1.19  	.org	0
    1.20  
    1.21  	.globl	_start
    1.22  _start:
    1.23 -	cld
    1.24 -	movw	$packedcode-unpack, %ax
    1.25 -	movw	$packedcode+ORGCOM, %si
    1.26 -	movw	$-STKSZ-CODESZ, %di
    1.27 -	subw	%ax, %di
    1.28 -	pushw	%di
    1.29 -	movw	$CODESZ/2, %cx
    1.30 -	rep
    1.31 -	  movsw				// packed code
    1.32 -	movw	$unpack+ORGCOM, %si
    1.33 -	movw	%di, %bx
    1.34 -	xchgw	%ax, %cx
    1.35 +	movw	$ORGCOM, %ax
    1.36 +	pushw	%ax
    1.37 +	movw	$packedcode+ORGCOM-1, %si
    1.38 +#ifdef USE_CX_LOADER
    1.39 +	pushw	%cx
    1.40 +#endif
    1.41 +	movw	$-STKROOM-1, %di
    1.42 +	movw	$packedcode-unpack-1, %cx
    1.43 +	std
    1.44 +// *               max ~47k                  |     17k
    1.45 +// oouuuuppppppppppppppppppppp-------------------S---16k----
    1.46  	rep
    1.47  	  movsb				// decompressor
    1.48 -	movw	$ORGCOM, %di
    1.49 -	popw	%si
    1.50 +// oo----ppppppppppppppppppppp---------------uuuuS---16k----
    1.51 +#ifdef USE_CX_LOADER
    1.52 +	popw	%cx
    1.53  	pushw	%di
    1.54 -	pushw	%bx
    1.55 +	movsb
    1.56 +	movw	$packedcode+ORGCOM-1, %si
    1.57 +	addw	%cx, %si
    1.58 +#else
    1.59 +	pushw	%di
    1.60 +	movsb
    1.61 +#if (CODESZ % 256) == 0
    1.62 +	movb	$CODESZ/256, %ch
    1.63 +#else
    1.64 +	movw	$CODESZ, %cx		// the loader should update CX ...
    1.65 +#endif
    1.66 +	movw	$packedcode+ORGCOM+CODESZ-1, %si
    1.67 +//	unsigned char *code;		// But we can patch later:
    1.68 +//	size -= * (unsigned short *) (code + 19);
    1.69 +//	* (unsigned short *) (code + 19) += size;
    1.70 +//	* (unsigned short *) (code + 22) += size;
    1.71 +#endif
    1.72 +	rep
    1.73 +	  movsb				// packed code
    1.74 +// oo--------------------ppppppppppppppppppppuuuuS---16k----
    1.75 +//                                           *
    1.76 +	cld
    1.77 +	incw	%di
    1.78 +	xchgw	%ax, %di
    1.79 +	xchgw	%ax, %si
    1.80  	ret
    1.81 +// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx------uuuuS---16k----
    1.82 +// *               max ~47k                  |     17k
    1.83  
    1.84  unpack:
    1.85 +#ifdef	SETUP_SS
    1.86 +	movw	%ss, %bx
    1.87 +	leaw	STKSZ/16(%bx), %ax
    1.88 +	movw	%ax, %ss
    1.89 +	pushw	%bx
    1.90 +	call	dounpack
    1.91 +	popw	%ss
    1.92 +	ret
    1.93 +dounpack:
    1.94 +#endif
    1.95  #define FLAT16
    1.96  #include "unlzma.S"
    1.97