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https://github.com/upx/upx
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eabi-linux.shlib unfilter in thumb mode
This commit is contained in:
John Reiser
parent
eeae73296e
commit
ee1a8e6a32
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@ -158,13 +158,11 @@ p_mprot=_ // 15
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lsr tmp,tmp,#2; push_ tmp // w_fragment
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o_wfrag=_ // 16
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.balign 4
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call4 L610
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.arm
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f_unfilter: // (char *ptr, uint len, uint cto, uint fid)
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#define ptr r0
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#define len r1
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#define cto r2
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#define cto r2 /* FIXME: unused */
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#define fid r3
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#define t1 r2
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@ -173,27 +171,26 @@ f_unfilter: // (char *ptr, uint len, uint cto, uint fid)
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#ifndef FILTER_ID /*{*/
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#define FILTER_ID 0x50 /* little-endian */
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#endif /*}*/
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and fid,fid,#0xff
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cmp fid,#FILTER_ID // last use of fid
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bxne lr // no-op if not filter 0x50
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movs len,len,lsr #2 // word count
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cmpne ptr,#0
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bxeq lr // no-op if either len or ptr is 0
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lsl fid,fid,#24; tst len,len; beq unf_done
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lsr fid,fid,#24; tst ptr,ptr; beq unf_done
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cmp fid,#FILTER_ID; bne unf_done // last use of fid
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b tst_unf
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top_unf:
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sub len,len,#1
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ldr t1,[ptr,len,lsl #2]
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and t2,t1,#0x0f<<24
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cmp t2, #0x0b<<24; bne tst_unf // not 'bl' subroutine call
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and t2,t1,#0xff<<24 // all the non-displacement bits
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sub t1,t1,len // convert to word-relative displacement
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bic t1,t1,#0xff<<24 // restrict to displacement field
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sub len,len,#4
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ldr t1,[ptr,len]
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lsl t2,t1,#4
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lsr t2,t2,#4+24 // bits 27..24
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cmp t2,#0x0b; bne tst_unf // not 'bl' subroutine call
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lsr len,len,#2; sub t2,t1,len // convert to word-relative displacement
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lsl len,len,#2
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lsr t1,t1,#24; lsl t2,t2,#8
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lsl t1,t1,#24; lsr t2,t2,#8
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orr t1,t1,t2 // re-combine
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str t1,[ptr,len,lsl #2]
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str t1,[ptr,len]
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tst_unf:
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cmp len,#0
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bne top_unf
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unf_done:
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ret
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#undef ptr
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@ -204,10 +201,9 @@ tst_unf:
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#undef t1
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#undef t2
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.thumb
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.thumb_func
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L610:
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mov tmp,lr; sub tmp,#1; push_ tmp // &f_unfilter (ARM mode)
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push_ lr // &f_unfilter (thumb mode)
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o_unflt=_ // 17
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ldrb tmp,[esi,#b_method-4+1]; push_ tmp // ftid
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ldrb tmp,[esi,#b_method-4+2]; push_ tmp // cto8
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@ -330,13 +326,11 @@ _=-5+_ // 22
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pop_ tmp // toss arg5
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//p_unflt // 21
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pop {arg1,arg2,arg3,arg4, eax}
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_=-5+_ // 16
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pop {arg1,arg2,arg3,arg4, eax, r5} // r5= w_fragment [discard]
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_=-6+_ // 15
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tst arg4,arg4; beq 0f // 0==ftid ==> no filter
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blx eax // unfilter
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blx eax // f_unfilter
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0:
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add sp,#4 // toss w_fragment
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_=-1+_ // 15
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ldr arg1,[sp,#0*4] // lo(dst)
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ldr arg2,[sp,#1*4] // len
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add arg2,arg1 // hi(dst)
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@ -365,6 +359,8 @@ _=-3+_ // 9
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.thumb_func
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movsl_subr:
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.real_start_ofmovsl_subr:
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lsr esi,esi,#2
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lsl esi,esi,#2 // word align [corrects for thumb-mode]
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push {lr}; mov tmp,esi; bl wlen_subr
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pop {tmp}; mov lr,tmp
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// FALL THROUGH to the part of 'movsl' that trims to a multiple of 8 words.
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@ -374,17 +370,17 @@ movsl_subr:
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str tmp,[edi,#0]; add edi,#4
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sub ecx,#1
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.thumb_func
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movsl:
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movsl: // In: edi= 4-byte aligned dst; esi= 4-byte aligned src; ecx= word count
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.real_start_ofmovsl:
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mov tmp,#7; tst ecx,tmp; bne 9b
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lsr ecx,#3; beq 9f
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.balign 4; bx pc; nop // enter ARM mode
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.arm
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stmdb sp!,{r2,r4,r6, r7,r8,r9} // tmp===r3, ecx===r5
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stmdb sp!,{r2, r4,r6, r7,r8,r9} // tmp===r3, ecx===r5
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7:
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ldmia esi!,{r2,r3,r4,r6, r7,r8,r9,r12}; subs ecx,ecx,#1
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stmia edi!,{r2,r3,r4,r6, r7,r8,r9,r12}; bne 7b
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ldmia sp!,{r2,r4,r6, r7,r8,r9}
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ldmia sp!,{r2, r4,r6, r7,r8,r9}
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9:
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ret
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@ -452,11 +448,12 @@ o_super=_ // 28
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ldr esi,[SP(o_uncpr)]
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str edi,[SP(o_uncpr)]
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bl movsl_subr // copy decompressor (FIXME: must be ARM mode)
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bl movsl_subr // copy decompressor
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add tmp,edi,#1 // dst f_unfilter thumb mode
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ldr esi,[SP(o_unflt)]
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str edi,[SP(o_unflt)]
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bl movsl_subr // copy unfilter (FIXME: must be ARM mode)
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str tmp,[SP(o_unflt)]
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bl movsl_subr // copy f_unfilter
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pop_ esi // &supervise
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add r7,edi,#1 // &copied (thumb mode)
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@ -476,6 +473,8 @@ get4u:
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ret
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wlen_subr: // Out: ecx= nwords of inline subr at *tmp
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lsr tmp,tmp,#2
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lsl tmp,tmp,#2 // word align (correct for thumb mode)
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sub tmp,#4
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ldrh ecx,[tmp,#0]; lsl ecx,#32-11; lsr ecx,#32-11-11 // hi(disp)
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ldrh tmp,[tmp,#2]; lsl tmp,#32-11; lsr tmp,#32-11- 0 // lo(disp)
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File diff suppressed because it is too large
Load Diff
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@ -2,20 +2,19 @@ file format elf32-littlearm
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Sections:
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Idx Name Size VMA LMA File off Algn Flags
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0 ELFMAINX 000000bc 00000000 00000000 00000034 2**2 CONTENTS, RELOC, READONLY
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1 NRV_HEAD 00000000 00000000 00000000 000000f0 2**0 CONTENTS, READONLY
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2 NRV_TAIL 00000000 00000000 00000000 000000f0 2**0 CONTENTS, READONLY
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3 NRV2E 0000013c 00000000 00000000 000000f0 2**0 CONTENTS, RELOC, READONLY
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4 NRV2D 00000128 00000000 00000000 0000022c 2**0 CONTENTS, RELOC, READONLY
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5 NRV2B 000000ec 00000000 00000000 00000354 2**0 CONTENTS, RELOC, READONLY
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6 LZMA_ELF00 000000b8 00000000 00000000 00000440 2**0 CONTENTS, RELOC, READONLY
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7 LZMA_DEC20 00000938 00000000 00000000 000004f8 2**0 CONTENTS, RELOC, READONLY
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8 LZMA_DEC10 00000478 00000000 00000000 00000e30 2**0 CONTENTS, RELOC, READONLY
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9 LZMA_DEC30 00000000 00000000 00000000 000012a8 2**0 CONTENTS, READONLY
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10 ELFMAINY 0000003e 00000000 00000000 000012a8 2**0 CONTENTS, READONLY
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11 ELFMAINZ 00000160 00000000 00000000 000012e8 2**2 CONTENTS, RELOC, READONLY
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0 ELFMAINX 000000a0 00000000 00000000 00000034 2**2 CONTENTS, RELOC, READONLY
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1 NRV_HEAD 00000000 00000000 00000000 000000d4 2**0 CONTENTS, READONLY
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2 NRV_TAIL 00000000 00000000 00000000 000000d4 2**0 CONTENTS, READONLY
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3 NRV2E 0000013c 00000000 00000000 000000d4 2**0 CONTENTS, RELOC, READONLY
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4 NRV2D 00000128 00000000 00000000 00000210 2**0 CONTENTS, RELOC, READONLY
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5 NRV2B 000000ec 00000000 00000000 00000338 2**0 CONTENTS, RELOC, READONLY
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6 LZMA_ELF00 000000b8 00000000 00000000 00000424 2**0 CONTENTS, RELOC, READONLY
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7 LZMA_DEC20 00000938 00000000 00000000 000004dc 2**0 CONTENTS, RELOC, READONLY
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8 LZMA_DEC10 00000478 00000000 00000000 00000e14 2**0 CONTENTS, RELOC, READONLY
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9 LZMA_DEC30 00000000 00000000 00000000 0000128c 2**0 CONTENTS, READONLY
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10 ELFMAINY 0000003e 00000000 00000000 0000128c 2**0 CONTENTS, READONLY
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11 ELFMAINZ 0000016c 00000000 00000000 000012cc 2**2 CONTENTS, RELOC, READONLY
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SYMBOL TABLE:
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00000000 l d ELFMAINX 00000000 ELFMAINX
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00000000 l ELFMAINX 00000000 .real_start_ofELFMAINX
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00000000 l d NRV2E 00000000 NRV2E
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00000000 l d NRV2D 00000000 NRV2D
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@ -26,6 +25,7 @@ SYMBOL TABLE:
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00000000 l d LZMA_DEC30 00000000 LZMA_DEC30
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00000000 l d ELFMAINZ 00000000 ELFMAINZ
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00000000 l ELFMAINZ 00000000 .real_start_ofELFMAINZ
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00000000 l d ELFMAINX 00000000 ELFMAINX
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00000000 l d NRV_HEAD 00000000 NRV_HEAD
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00000000 l d NRV_TAIL 00000000 NRV_TAIL
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00000000 l d ELFMAINY 00000000 ELFMAINY
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@ -40,11 +40,9 @@ RELOCATION RECORDS FOR [ELFMAINX]:
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OFFSET TYPE VALUE
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00000030 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000048 R_ARM_THM_CALL .real_start_ofELFMAINX
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00000074 R_ARM_PC24 ELFMAINX
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00000090 R_ARM_PC24 ELFMAINX
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000000aa R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000b0 R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000b8 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000090 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000096 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000009c R_ARM_THM_CALL .real_start_ofELFMAINZ
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RELOCATION RECORDS FOR [NRV2E]:
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OFFSET TYPE VALUE
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@ -257,12 +255,12 @@ OFFSET TYPE VALUE
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00000028 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000030 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000050 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000006a R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000080 R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000b0 R_ARM_PC24 ELFMAINZ
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000000ce R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000f4 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000010c R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000116 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000011e R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000126 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000068 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000082 R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000b4 R_ARM_PC24 ELFMAINZ
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000000d2 R_ARM_THM_CALL .real_start_ofELFMAINZ
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000000f8 R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000110 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000011a R_ARM_THM_CALL .real_start_ofELFMAINZ
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00000124 R_ARM_THM_CALL .real_start_ofELFMAINZ
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0000012c R_ARM_THM_CALL .real_start_ofELFMAINZ
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