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https://github.com/upx/upx
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work on stub for powerpc-darwin.dylib-entry.S
This commit is contained in:
John Reiser
parent
b89c0b35d1
commit
a187cb6c9c
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@ -473,7 +473,7 @@ void PackMachBase<T>::pack4dylib( // append PackHeader
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segcmdtmp.filesize = fo->getBytesWritten();
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segcmdtmp.maxprot |= Mach_segment_command::VM_PROT_WRITE;
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segcmdtmp.initprot |= Mach_segment_command::VM_PROT_WRITE;
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o_end_txt = segcmdtmp.filesize + segcmdtmp.fileoff;
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opos = o_end_txt = segcmdtmp.filesize + segcmdtmp.fileoff;
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}
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else {
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opos += ~PAGE_MASK & (0u - opos); // advance to PAGE_SIZE boundary
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@ -1,5 +1,5 @@
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/*
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* powerpc-darwin.dylib-entry.S -- program entry point & decompressor (PowerPC32 dylib)
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* powerpc-darwin.dylib-entry.S -- program entry point & decompress (PowerPC32 dylib)
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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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@ -41,7 +41,7 @@
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_start: .globl _start
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mflr r2
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call main # must be exactly 1 instruction; link_register= &decompress
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decompressor:
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decompress:
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section NRV_HEAD
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SZ_DLINE=128 # size of data cache line in Apple G5
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@ -110,10 +110,28 @@ cfl_ret:
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// IDENTSTR goes here
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section ELFMAINZ
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sz_l_info= 12
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sz_p_info= 12
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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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b_ftid= 9
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b_cto8= 10
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// register numbers during entry
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#define f_unc 31
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#define f_unf 30
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#define l_unm 29
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#define a_unm 28
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#define unc 27
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#define cpr 26
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#define unc2 25
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#define cpr2 24
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#define l_unc 23
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#define l_cpr 22
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#define f_uini 21
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#define t_h 20 /* temporary */
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PROT_NONE =0x00
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PROT_READ =0x01
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@ -125,21 +143,22 @@ MAP_PRIVATE =0x2
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MAP_ANON =0x1000
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SYS_mmap =197
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SYS_munmap= 73
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SYS_mprotect= 74
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main2:
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teq r0,r0 // debugging
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//teq r0,r0 // debugging
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stwu r2,-4*(1+ 32-a0)(sp) # retaddr
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stmw a0,4*1(sp)
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mflr r31 # r31= &decompressor
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lwz r29, -4*1(r31) # "call main" at _start
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lwz r30,-4*1+ _start - decompressor(r31) # 4+ offset(_start)
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rlwinm r29,r29,0,6,29 # 4+ main - decompressor
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add r30,r30,r29 # offset(main); ASSUMES (8+_start)==decompressor
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addi r29,r29,-4 # main - decompressor
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mflr f_unc # f_unc= &decompress
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lwz t_h, -4*1(f_unc) # "call main" at _start
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lwz l_unm,-4*1+ _start - decompress(f_unc) # 4+ offset(_start)
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rlwinm t_h,t_h,0,6,29 # 4+ main - decompress
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add l_unm,l_unm,t_h # offset(main); ASSUMES (8+_start)==decompress
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addi t_h,t_h,-4 # main - decompress
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li a0,0 # addr
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mr a1,r30 # length
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mr a1,l_unm # length for munmap
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li a2,PROT_READ|PROT_WRITE
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li a3,MAP_ANON|MAP_PRIVATE
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li a4,-1
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@ -148,19 +167,19 @@ main2:
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li 0,SYS_mmap
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sc
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li a0,-1 # failure
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teq r0,r0 // debugging
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mr a_unm,a0 # address for munmap
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li a2,main - movup2
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mtctr a2
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add a1,a0 ,r30 # lwa(dst); new_page + offset(main)
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add a0,r29,r31 # lwa(src); &main
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add a1,a0 ,l_unm # lwa(dst); new_page + offset(main)
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add a0,t_h,f_unc # lwa(src); &main
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movup1: # descending copy [moveup2, main)
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lbzu r0,-1(a0)
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stbu r0,-1(a1)
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bdnz+ movup1
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subf a2,a2,r30 # offset(movup2)
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subf a2,a2,l_unm # offset(movup2)
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mtlr a1 # &copied movup2
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mtctr a2 # offset(movup2)
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blr # goto the copied code
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@ -169,11 +188,77 @@ movup2: # descending copy [base, movup2)
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lbzu r0,-1(a0)
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stbu r0,-1(a1)
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bdnz+ movup2
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subf f_unc,a0,f_unc
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add f_unc,a1,f_unc # relocated decompress
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subf r31,a0,r31
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add r31,a1,r31 # relocated decompressor
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lwz t0,-4*3+ _start - decompress(f_unc) # offset(b_info)
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add cpr,a1,t0 # &b_info
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add unc,a0,t0 # &b_info
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addi unc,unc,-sz_l_info -sz_p_info
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teq r0,r0
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// skip compressed Mach headers
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lwz t0,sz_cpr(cpr)
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addi cpr,cpr,sz_b_info
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add cpr,cpr,t0
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dy_uncpr:
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mr cpr2,cpr
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mr unc2,unc
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addi a0,cpr,sz_unc; call get4; beq dy_done; add unc,unc,a0; mr l_unc,a0
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addi a0,cpr,sz_cpr; call get4; add cpr,cpr,a0; mr l_cpr,a0
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addi cpr,cpr,sz_b_info
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stwu l_unc,-4(sp)
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mtlr f_unc
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addi a0,cpr2,sz_b_info # src
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mr a1,l_cpr
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mr a2,unc2 # dst
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mr a3,sp # &l_dst
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lbz a4,b_method(cpr2)
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blrl # uncompress
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addi sp,sp,4
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// FIXME: check status
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lbz a3,b_ftid(cpr2); cmpli cr0,a3,0; beq dy_uncpr
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lbz a2,b_cto8(cpr2)
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lwz a1,sz_unc(cpr2)
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mr a0,unc2
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bl unfilter
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b dy_uncpr
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dy_done:
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bl dy_done2
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dy_done1: # escape hatch
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sc # munmap
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li a0,~0 # failure
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lmw t0,0(sp); addi sp,sp,4*(32-t0)
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mtlr t0 # &continuation in dyld
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bctr # goto user_init_function
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dy_done2:
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li t0,(dy_done2 - dy_done1)/4
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mflr a0; la a0,dy_done2 - dy_done1(a0)
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mtctr t0
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dy_done3:
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lwzu t0,-4(a0)
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stwu t0,-4(unc2)
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bdnz+ dy_done3
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mtlr unc2
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mtctr f_uini # user_init_function
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mr a0,a_unm
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mr a1,l_unm
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li 0,SYS_munmap
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blr # goto relocted dy_done1
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get4:
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lbz t0,3(a0)
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lbz t1,2(a0); rlwimi t0,t1, 8,16,23
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lbz t1,1(a0); rlwimi t0,t1,16, 8,15
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lbz t1,0(a0); rlwimi t0,t1,24, 0, 7
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mr. a0,t0 # set condition codes
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blr
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unfilter: # FIXME
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ret
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main:
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b main2
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dy_top:
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@ -14,7 +14,7 @@ Idx Name Size VMA LMA File off Algn Flags
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9 NRV_TAIL 0000001c 00000000 00000000 00001784 2**0 CONTENTS, READONLY
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10 CFLUSH 00000024 00000000 00000000 000017a0 2**0 CONTENTS, READONLY
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11 ELFMAINY 00000000 00000000 00000000 000017c4 2**0 CONTENTS, READONLY
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12 ELFMAINZ 00000098 00000000 00000000 000017c4 2**0 CONTENTS, READONLY
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12 ELFMAINZ 0000019c 00000000 00000000 000017c4 2**0 CONTENTS, READONLY
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SYMBOL TABLE:
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00000000 l d LZMA_DEC30 00000000 LZMA_DEC30
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00000000 l d NRV_TAIL 00000000 NRV_TAIL
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@ -33,7 +33,7 @@ SYMBOL TABLE:
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RELOCATION RECORDS FOR [MACOS000]:
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OFFSET TYPE VALUE
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00000004 R_PPC_REL24 ELFMAINZ+0x00000094
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00000004 R_PPC_REL24 ELFMAINZ+0x00000198
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RELOCATION RECORDS FOR [NRV2E]:
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OFFSET TYPE VALUE
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