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/* lzo_asm.h -- LZO assembler stuff
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/***********************************************************************
// <asmconfig.h>
************************************************************************/
#if !defined(__i386__)
# error
#endif
#if !defined(IN_CONFIGURE)
#if defined(LZO_HAVE_CONFIG_H)
# include <config.h>
#else
/* manual configuration - see defaults below */
# if defined(__ELF__)
# define MFX_ASM_HAVE_TYPE 1
# define MFX_ASM_NAME_NO_UNDERSCORES 1
# elif defined(__linux__) /* Linux a.out */
# define MFX_ASM_ALIGN_PTWO 1
# elif defined(__DJGPP__)
# define MFX_ASM_ALIGN_PTWO 1
# elif defined(__GO32__) /* djgpp v1 */
# define MFX_ASM_CANNOT_USE_EBP 1
# elif defined(__EMX__)
# define MFX_ASM_ALIGN_PTWO 1
# define MFX_ASM_CANNOT_USE_EBP 1
# endif
#endif
#endif
#if 1 && defined(__ELF__)
.section .note.GNU-stack,"",@progbits
#endif
#if 0 && defined(__ELF__)
#undef i386
.arch i386
.code32
#endif
/***********************************************************************
// name always uses underscores
// [ OLD: name (default: with underscores) ]
************************************************************************/
#if !defined(LZO_ASM_NAME)
# define LZO_ASM_NAME(n) _ ## n
#if 0
# if defined(MFX_ASM_NAME_NO_UNDERSCORES)
# define LZO_ASM_NAME(n) n
# else
# define LZO_ASM_NAME(n) _ ## n
# endif
#endif
#endif
/***********************************************************************
// .type (default: do not use)
************************************************************************/
#if !defined(LZO_PUBLIC)
#if defined(__LZO_DB__)
# define LZO_PUBLIC(func) \
.p2align 4 ; .byte 0,0,0,0,0,0,0 ; .ascii "LZO_START"
# define LZO_PUBLIC_END(func) \
.p2align 4,0x90 ; .ascii "LZO_END"
#elif defined(MFX_ASM_HAVE_TYPE)
# define LZO_PUBLIC(func) \
ALIGN3 ; .type LZO_ASM_NAME(func),@function ; \
.globl LZO_ASM_NAME(func) ; LZO_ASM_NAME(func):
# define LZO_PUBLIC_END(func) \
.size LZO_ASM_NAME(func),.-LZO_ASM_NAME(func)
#else
# define LZO_PUBLIC(func) \
ALIGN3 ; .globl LZO_ASM_NAME(func) ; LZO_ASM_NAME(func):
# define LZO_PUBLIC_END(func)
#endif
#endif
/***********************************************************************
// .align (default: bytes)
************************************************************************/
#if !defined(MFX_ASM_ALIGN_BYTES) && !defined(MFX_ASM_ALIGN_PTWO)
# define MFX_ASM_ALIGN_BYTES 1
#endif
#if !defined(LZO_ASM_ALIGN)
# if defined(MFX_ASM_ALIGN_PTWO)
# define LZO_ASM_ALIGN(x) .align x
# else
# define LZO_ASM_ALIGN(x) .align (1 << (x))
# endif
#endif
#define ALIGN1 LZO_ASM_ALIGN(1)
#define ALIGN2 LZO_ASM_ALIGN(2)
#define ALIGN3 LZO_ASM_ALIGN(3)
/***********************************************************************
// ebp usage (default: can use)
************************************************************************/
#if !defined(MFX_ASM_CANNOT_USE_EBP)
# if 1 && !defined(N_3_EBP) && !defined(N_255_EBP)
# define N_3_EBP 1
# endif
# if 0 && !defined(N_3_EBP) && !defined(N_255_EBP)
# define N_255_EBP 1
# endif
#endif
#if defined(N_3_EBP) && defined(N_255_EBP)
# error
#endif
#if defined(MFX_ASM_CANNOT_USE_EBP)
# if defined(N_3_EBP) || defined(N_255_EBP)
# error
# endif
#endif
#if !defined(N_3)
# if defined(N_3_EBP)
# define N_3 %ebp
# else
# define N_3 $3
# endif
#endif
#if !defined(N_255)
# if defined(N_255_EBP)
# define N_255 %ebp
# define NOTL_3(r) xorl %ebp,r
# else
# define N_255 $255
# endif
#endif
#if !defined(NOTL_3)
# define NOTL_3(r) xorl N_3,r
#endif
/***********************************************************************
//
************************************************************************/
#ifndef INP
#define INP 4+36(%esp)
#define INS 8+36(%esp)
#define OUTP 12+36(%esp)
#define OUTS 16+36(%esp)
#endif
#define INEND 4(%esp)
#define OUTEND (%esp)
#if defined(LZO_TEST_DECOMPRESS_OVERRUN_INPUT)
# define TEST_IP_R(r) cmpl r,INEND ; jb .L_input_overrun
# define TEST_IP(addr,r) leal addr,r ; TEST_IP_R(r)
#else
# define TEST_IP_R(r)
# define TEST_IP(addr,r)
#endif
#if defined(LZO_TEST_DECOMPRESS_OVERRUN_OUTPUT)
# define TEST_OP_R(r) cmpl r,OUTEND ; jb .L_output_overrun
# define TEST_OP(addr,r) leal addr,r ; TEST_OP_R(r)
#else
# define TEST_OP_R(r)
# define TEST_OP(addr,r)
#endif
#if defined(LZO_TEST_DECOMPRESS_OVERRUN_LOOKBEHIND)
# define TEST_LOOKBEHIND(r) cmpl OUTP,r ; jb .L_lookbehind_overrun
#else
# define TEST_LOOKBEHIND(r)
#endif
/***********************************************************************
//
************************************************************************/
#define LODSB movb (%esi),%al ; incl %esi
#define MOVSB(r1,r2,x) movb (r1),x ; incl r1 ; movb x,(r2) ; incl r2
#define MOVSW(r1,r2,x) movb (r1),x ; movb x,(r2) ; \
movb 1(r1),x ; addl $2,r1 ; \
movb x,1(r2) ; addl $2,r2
#define MOVSL(r1,r2,x) movl (r1),x ; addl $4,r1 ; movl x,(r2) ; addl $4,r2
#if defined(LZO_DEBUG)
#define COPYB_C(r1,r2,x,rc) \
cmpl $0,rc ; jz .L_assert_fail; \
9: MOVSB(r1,r2,x) ; decl rc ; jnz 9b
#define COPYL_C(r1,r2,x,rc) \
cmpl $0,rc ; jz .L_assert_fail; \
9: MOVSL(r1,r2,x) ; decl rc ; jnz 9b
#else
#define COPYB_C(r1,r2,x,rc) \
9: MOVSB(r1,r2,x) ; decl rc ; jnz 9b
#define COPYL_C(r1,r2,x,rc) \
9: MOVSL(r1,r2,x) ; decl rc ; jnz 9b
#endif
#define COPYB(r1,r2,x) COPYB_C(r1,r2,x,%ecx)
#define COPYL(r1,r2,x) COPYL_C(r1,r2,x,%ecx)
/***********************************************************************
// not used
************************************************************************/
#if 0
#if 0
#define REP_MOVSB(x) rep ; movsb
#define REP_MOVSL(x) shrl $2,%ecx ; rep ; movsl
#elif 1
#define REP_MOVSB(x) COPYB(%esi,%edi,x)
#define REP_MOVSL(x) shrl $2,%ecx ; COPYL(%esi,%edi,x)
#else
#define REP_MOVSB(x) rep ; movsb
#define REP_MOVSL(x) jmp 9f ; 8: movsb ; decl %ecx ; \
9: testl $3,%edi ; jnz 8b ; \
movl %ecx,x ; shrl $2,%ecx ; andl $3,x ; \
rep ; movsl ; movl x,%ecx ; rep ; movsb
#endif
#if 1
#define NEGL(x) negl x
#else
#define NEGL(x) xorl $-1,x ; incl x
#endif
#endif
/*
vi:ts=4
*/
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