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[zbin] Remove now-unused unnrv2b.S decompressor

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 9 år sedan
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2 ändrade filer med 0 tillägg och 193 borttagningar
  1. 0
    184
      src/arch/i386/prefix/unnrv2b.S
  2. 0
    9
      src/arch/i386/prefix/unnrv2b16.S

+ 0
- 184
src/arch/i386/prefix/unnrv2b.S Visa fil

@@ -1,184 +0,0 @@
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-/* 
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- * Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
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- *
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- * This file is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License as
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- * published by the Free Software Foundation; either version 2 of
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- * the License, or (at your option) any later version.
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- *
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- * Originally this code was part of ucl the data compression library
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- * for upx the ``Ultimate Packer of eXecutables''.
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- *
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- * - Converted to gas assembly, and refitted to work with etherboot.
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- *   Eric Biederman 20 Aug 2002
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- *
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- * - Structure modified to be a subroutine call rather than an
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- *   executable prefix.
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- *   Michael Brown 30 Mar 2004
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- *
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- * - Modified to be compilable as either 16-bit or 32-bit code.
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- *   Michael Brown 9 Mar 2005
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- */
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-
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-FILE_LICENCE ( GPL2_OR_LATER )
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-
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-/****************************************************************************
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- * This file provides the decompress() and decompress16() functions
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- * which can be called in order to decompress an image compressed with
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- * the nrv2b utility in src/util.
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- *
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- * These functions are designed to be called by the prefix.  They are
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- * position-independent code.
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- *
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- * The same basic assembly code is used to compile both
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- * decompress() and decompress16().
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- ****************************************************************************
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- */
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-
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-	.text
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-	.arch i386
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-	.section ".prefix.lib", "ax", @progbits
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-
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-#ifdef CODE16
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-/****************************************************************************
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- * decompress16 (real-mode near call, position independent)
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- *
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- * Decompress data in 16-bit mode
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- *
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- * Parameters (passed via registers):
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- *   %ds:%esi - Start of compressed input data
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- *   %es:%edi - Start of output buffer
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- * Returns:
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- *   %ds:%esi - End of compressed input data
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- *   %es:%edi - End of decompressed output data
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- *   All other registers are preserved
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- *
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- * NOTE: It would be possible to build a smaller version of the
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- * decompression code for -DKEEP_IT_REAL by using
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- *    #define REG(x) x
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- * to use 16-bit registers where possible.  This would impose limits
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- * that the compressed data size must be in the range [1,65533-%si]
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- * and the uncompressed data size must be in the range [1,65536-%di]
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- * (where %si and %di are the input values for those registers).  Note
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- * particularly that the lower limit is 1, not 0, and that the upper
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- * limit on the input (compressed) data really is 65533, since the
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- * algorithm may read up to three bytes beyond the end of the input
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- * data, since it reads dwords.
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- ****************************************************************************
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- */
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-
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-#define REG(x) e ## x
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-#define ADDR32 addr32
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-
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-	.code16
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-	.globl	decompress16
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-decompress16:
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-	
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-#else /* CODE16 */
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-
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-/****************************************************************************
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- * decompress (32-bit protected-mode near call, position independent)
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- *
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- * Parameters (passed via registers):
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- *   %ds:%esi - Start of compressed input data
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- *   %es:%edi - Start of output buffer
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- * Returns:
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- *   %ds:%esi - End of compressed input data
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- *   %es:%edi - End of decompressed output data
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- *   All other registers are preserved
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- ****************************************************************************
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- */
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-
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-#define REG(x) e ## x
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-#define ADDR32
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-	
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-	.code32
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-	.globl	decompress
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-decompress:
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-
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-#endif /* CODE16 */
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-
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-#define xAX	REG(ax)
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-#define xCX	REG(cx)
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-#define xBP	REG(bp)
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-#define xSI	REG(si)
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-#define xDI	REG(di)
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-
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-	/* Save registers */
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-	push	%xAX
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-	pushl	%ebx
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-	push	%xCX
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-	push	%xBP
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-	/* Do the decompression */
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-	cld
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-	xor	%xBP, %xBP
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-	dec	%xBP		/* last_m_off = -1 */
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-	jmp	dcl1_n2b
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-	
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-decompr_literals_n2b:
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-	ADDR32 movsb
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-decompr_loop_n2b:
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-	addl	%ebx, %ebx
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-	jnz	dcl2_n2b
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-dcl1_n2b:
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-	call	getbit32
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-dcl2_n2b:
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-	jc	decompr_literals_n2b
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-	xor	%xAX, %xAX
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-	inc	%xAX		/* m_off = 1 */
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-loop1_n2b:
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-	call	getbit1
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-	adc	%xAX, %xAX	/* m_off = m_off*2 + getbit() */
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-	call	getbit1
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-	jnc	loop1_n2b	/* while(!getbit()) */
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-	sub	$3, %xAX
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-	jb	decompr_ebpeax_n2b	/* if (m_off == 2) goto decompr_ebpeax_n2b ? */
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-	shl	$8, %xAX	
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-	ADDR32 movb (%xSI), %al	/* m_off = (m_off - 3)*256 + src[ilen++] */
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-	inc	%xSI
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-	xor	$-1, %xAX
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-	jz	decompr_end_n2b	/* if (m_off == 0xffffffff) goto decomp_end_n2b */
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-	mov	%xAX, %xBP	/* last_m_off = m_off ?*/
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-decompr_ebpeax_n2b:
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-	xor	%xCX, %xCX
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-	call	getbit1
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-	adc	%xCX, %xCX	/* m_len = getbit() */
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-	call	getbit1
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-	adc	%xCX, %xCX	/* m_len = m_len*2 + getbit()) */
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-	jnz	decompr_got_mlen_n2b	/* if (m_len == 0) goto decompr_got_mlen_n2b */
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-	inc	%xCX		/* m_len++ */
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-loop2_n2b:
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-	call	getbit1	
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-	adc	%xCX, %xCX	/* m_len = m_len*2 + getbit() */
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-	call	getbit1
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-	jnc	loop2_n2b	/* while(!getbit()) */
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-	inc	%xCX
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-	inc	%xCX		/* m_len += 2 */
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-decompr_got_mlen_n2b:
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-	cmp	$-0xd00, %xBP
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-	adc	$1, %xCX	/* m_len = m_len + 1 + (last_m_off > 0xd00) */
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-	push	%xSI
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-	ADDR32 lea (%xBP,%xDI), %xSI	/* m_pos = dst + olen + -m_off  */
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-	rep
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-	es ADDR32 movsb		/* dst[olen++] = *m_pos++ while(m_len > 0) */
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-	pop	%xSI
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-	jmp	decompr_loop_n2b
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-
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-
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-getbit1:
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-	addl	%ebx, %ebx
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-	jnz	1f
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-getbit32:
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-	ADDR32 movl (%xSI), %ebx
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-	sub	$-4, %xSI	/* sets carry flag */
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-	adcl	%ebx, %ebx
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-1:
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-	ret
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-
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-decompr_end_n2b:
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-	/* Restore registers and return */
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-	pop	%xBP
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-	pop	%xCX
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-	popl	%ebx
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-	pop	%xAX
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-	ret

+ 0
- 9
src/arch/i386/prefix/unnrv2b16.S Visa fil

@@ -1,9 +0,0 @@
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-/*
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- * 16-bit version of the decompressor
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- *
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- */
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-
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-FILE_LICENCE ( GPL2_OR_LATER )
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-
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-#define CODE16
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-#include "unnrv2b.S"

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