Markus F.X.J. Oberhumer
160 lines
4.2 KiB
ArmAsm
160 lines
4.2 KiB
ArmAsm
/* arm64-darwin.macho-entry.S -- iPhone program entry point & decompressor (Elf binary)
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*
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* This file is part of the UPX executable compressor.
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*
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* Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
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* Copyright (C) 1996-2015 Laszlo Molnar
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* Copyright (C) 2000-2015 John F. Reiser
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* All Rights Reserved.
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*
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* UPX and the UCL library are free software; you can redistribute them
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* and/or modify them 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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING.
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* If not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Markus F.X.J. Oberhumer Laszlo Molnar
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* <markus@oberhumer.com> <ml1050@users.sourceforge.net>
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*
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* John F. Reiser
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* <jreiser@users.sourceforge.net>
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*/
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//#define SIMULATE_ON_DEBIAN_EABI4 1
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#undef SIMULATE_ON_DEBIAN_EABI4
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#ifdef SIMULATE_ON_DEBIAN_EABI4 /*{*/
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#define LINUX_ARM_CACHEFLUSH 1 /* SIMULATE_ON_DEBIAN_EABI4 */
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#define ARMEL_EABI4 1 /* SIMULATE_ON_DEBIAN_EABI4 */
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#else /*}{ usual case */
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#define DARWIN_ARM_CACHEFLUSH 1
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#define ARMEL_DARWIN 1
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#endif /*}*/
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#define lr x30
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#include "arch/arm64/v8/macros.S"
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sz_b_info= 12
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sz_unc= 0
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sz_cpr= 4
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b_method= 8
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sz_l_info= 12
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sz_p_info= 12
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PROT_READ= 1
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PROT_WRITE= 2
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PROT_EXEC= 4
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MAP_PRIVATE= 2
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MAP_FIXED= 0x10
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MAP_ANONYMOUS= 0x20
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PAGE_SHIFT= 12
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PAGE_SIZE = -(~0<<PAGE_SHIFT)
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__NR_exit = 1 + __NR_SYSCALL_BASE
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__NR_write = 4 + __NR_SYSCALL_BASE
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__NR_mmap = 197 + __NR_SYSCALL_BASE
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// DEBUG ONLY:
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__ARM_NR_BASE = 0xf0000 + __NR_SYSCALL_BASE
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__ARM_NR_cacheflush = 2 + __ARM_NR_BASE
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//.long sz_pack2 // placed there by ::pack3()
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section MACHMAINX
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_start: .globl _start
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sub sp,sp,#4 // space for mhdrp
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stp x0,x1,[sp,#-30*8]! // paranoia; omit r30(lr), r31(sp)
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stp x2,x3,[sp,#2*8]
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stp x4,x5,[sp,#4*8]
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stp x6,x7,[sp,#6*8]
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stp x8,x9,[sp,#8*8]
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stp x10,x11,[sp,#10*8]
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stp x12,x13,[sp,#12*8]
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stp x14,x15,[sp,#14*8]
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stp x16,x17,[sp,#16*8]
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stp x18,x19,[sp,#18*8]
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stp x20,x21,[sp,#20*8]
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stp x22,x23,[sp,#22*8]
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stp x24,x25,[sp,#24*8]
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stp x26,x27,[sp,#26*8]
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stp x28,x29,[sp,#28*8]
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bl main
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L20:
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f_decompress:
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section NRV_HEAD
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// empty
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section NRV2E
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#include "arch/arm64/v8/nrv2e_d8.S"
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section NRV2D
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#include "arch/arm64/v8/nrv2d_d8.S"
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section NRV2B
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#include "arch/arm64/v8/nrv2b_d8.S"
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section NRV_TAIL
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// empty
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#include "arch/arm64/v8/lzma_d.S"
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section MACHMAINY
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end_decompress: .globl end_decompress
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/* IDENTSTR goes here */
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section MACHMAINZ
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#define lsrc w1
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#define ldst w3
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#define ldstx x3
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unfold: // lr= &L100
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ldr ldst,[lr,#sz_unc]
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ldr lsrc,[lr,#sz_cpr]
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add dst,lr,lsrc,uxtw; add dst,dst,#sz_b_info
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add src,lr,ldst,uxtw; add src,src,#GAP+NO_LAP // defend against prefetch and overlap
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mov w4,lsrc // loop count
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#define t0 w9
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movup: // descending copy folded_loader to higher address
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ldr t0,[dst,#-4]!; sub w4,w4,#4
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str t0,[src,#-4]!; cbnz w4,movup
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ldr w4, [lr,#b_method] // 5th param to decompressor
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add lr,lr,#GAP
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PUSH1(ldst); mov ldstx,sp // LZMA needs for EOF
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mov dst,lr // unfolded result
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sub x11,x5,#4+ L20 - _start // &sz_pack2 param to unfolded loader
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mov x10,lr // DEBUG ONLY
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blr x5 // br r5
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br x10 // DEBUG ONLY
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main:
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mov x5,lr // &f_decompress
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bl unfold
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L100:
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/* { b_info={sz_unc, sz_cpr, {4 char}}, folded_loader...} */
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GAP= 128 // > farthest prefetch; must match ../../p_mach.cpp
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NO_LAP= 64 // avoid overlap for folded loader; must match ../../p_mach.cpp
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#undef ldstx
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#undef ldst
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/*
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vi:ts=8:et:nowrap
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*/
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