Using the larger vgtrace.rar (871KB) from a message that was posted just a few
minutes
before the smaller version (22.3KB), then the interesting part is near the end
***** line 358098
==== SB 4145 (evchecks 744961) [tid 1] 0x4002995
__dl__ZL24debuggerd_signal_handleriP7siginfoPv+584 /system_O/bin/linker+0x2995
------------------------ Front end ------------------------
(thumb) 0x4002994: mov r1, r0
------ IMark(0x4002994, 2, 1) ------
t0 = 0x0:I32
PUT(392) = t0
t1 = 0x1:I32
t2 = GET:I32(8)
PUT(12) = ITE(CmpNE32(t1,0x0:I32),t2,GET:I32(12))
PUT(68) = 0x4002997:I32
[[snip]]
(thumb) 0x40029A0: blx 0x4039678 (switch to ARM mode)
------ IMark(0x40029A0, 4, 1) ------
t13 = 0x0:I32
PUT(392) = t13
t14 = 0x1:I32
PUT(392) = t13
t15 = Shr32(t13,0x8:I8)
if (CmpNE32(t15,0x0:I32)) { PUT(68) = 0x40029A1:I32;
exit-NoDecode }
PUT(392) = t13
if (Not1(32to1(t14))) { PUT(68) = 0x40029A5:I32; exit-Boring }
PUT(64) = 0x40029A5:I32
PUT(68) = 0x4039678:I32
PUT(68) = GET:I32(68); exit-Call
GuestBytes 4002995 16 46 40 F2 6B 10 52 46 5B 46 00 95 36 F0 6A EE 00 002ADA34
VexExpansionRatio 16 208 130 :10
--28961-- VALGRIND INTERNAL ERROR: Valgrind received a signal 4 (SIGILL) -
exiting
--28961-- si_code=1; Faulting address: 0x0; sp: 0x831d9d94
*****
and the earlier translation for the subroutine at 0x4039678:
***** line 61104
==== SB 693 (evchecks 3967) [tid 1] 0x4039678 __dl_syscall
/system_O/bin/linker+0x39678
------------------------ Front end ------------------------
(arm) 0x4039678: mov r12, r13 // no registers saved at entry
------ IMark(0x4039678, 4, 0) ------
t1 = GET:I32(60)
t0 = t1
t2 = t0
PUT(56) = t2
PUT(68) = 0x403967C:I32
(arm) 0x403967C: stmdb r13!, {0x00F0}
------ IMark(0x403967C, 4, 0) ------
t3 = GET:I32(60)
t4 = t3
PUT(60) = Sub32(t3,0x10:I32)
STle(Sub32(t4,0x4:I32)) = GET:I32(36)
STle(Sub32(t4,0x8:I32)) = GET:I32(32)
STle(Sub32(t4,0xC:I32)) = GET:I32(28)
STle(Sub32(t4,0x10:I32)) = GET:I32(24)
PUT(68) = 0x4039680:I32
[[snip]]
(arm) 0x4039690: ldmia r12, {0x0078}
------ IMark(0x4039690, 4, 0) ------
t17 = GET:I32(56)
t18 = t17
PUT(20) = LDle:I32(Add32(t18,0x0:I32))
PUT(24) = LDle:I32(Add32(t18,0x4:I32))
PUT(28) = LDle:I32(Add32(t18,0x8:I32))
PUT(32) = LDle:I32(Add32(t18,0xC:I32))
PUT(68) = 0x4039694:I32
(arm) 0x4039694: svc #0x00000000
------ IMark(0x4039694, 4, 0) ------
PUT(68) = 0x4039698:I32
PUT(68) = GET:I32(68); exit-Sys_syscall
(arm) 0x4039698: ldmia r13!, {0x00F0}
------ IMark(0x4039698, 4, 0) ------
t0 = GET:I32(60)
t1 = t0
PUT(24) = LDle:I32(Add32(t1,0x0:I32))
PUT(28) = LDle:I32(Add32(t1,0x4:I32))
PUT(32) = LDle:I32(Add32(t1,0x8:I32))
PUT(36) = LDle:I32(Add32(t1,0xC:I32))
PUT(60) = Add32(t0,0x10:I32)
PUT(68) = 0x403969C:I32
[[snip]]
(arm) 0x40396A0: bx{ls} r14 // conditional return; is taken to
(thumb) 0x4008B8E [not shown]
------ IMark(0x40396A0, 4, 0) ------
t5 =
armg_calculate_condition[mcx=0x9]{0x5815eb7c}(Or32(GET:I32(72),0x90:I32),GET:I32(76),GET:I32(80),GET:I32(84)):I32
if (Not1(32to1(t5))) { PUT(68) = 0x40396A4:I32; exit-Boring }
t6 = GET:I32(64)
PUT(68) = t6
PUT(68) = GET:I32(68); exit-Return
[[snip; note change to (thumb) mode]]
(thumb) 0x40423E6: add sp, #16 // THIS LOOKS VERY STRANGE; What is
going on with the stack pointer?
------ IMark(0x40423E6, 2, 1) ------
t26 = GET:I32(392)
t27 = Shr32(t26,0x8:I8)
PUT(392) = t27
t28 =
armg_calculate_condition[mcx=0x9]{0x5815eb7c}(Or32(GET:I32(72),Xor32(And32(t26,0xF0:I32),0xE0:I32)),GET:I32(76),GET:I32(80),GET:I32(84)):I32
t29 = ITE(CmpNE32(And32(t26,0xF0:I32),0x0:I32),t28,0x1:I32)
t30 = Xor32(And32(t26,0x1:I32),0x1:I32)
t31 = And32(t30,t29)
PUT(60) =
ITE(CmpNE32(t29,0x0:I32),Add32(GET:I32(60),0x10:I32),GET:I32(60))
PUT(68) = 0x40423E9:I32
(thumb) 0x40423E8: ldmia r13!, {0x81F0} // unconditional return
------ IMark(0x40423E8, 4, 1) ------
t32 = 0x0:I32
PUT(392) = t32
t33 = 0x1:I32
PUT(392) = t32
t34 = Shr32(t32,0x8:I8)
if (CmpNE32(t34,0x0:I32)) { PUT(68) = 0x40423E9:I32;
exit-NoDecode }
PUT(392) = t32
if (Not1(32to1(t33))) { PUT(68) = 0x40423ED:I32; exit-Boring }
t35 = GET:I32(60)
t36 = t35
PUT(24) = LDle:I32(Add32(t36,0x0:I32))
PUT(28) = LDle:I32(Add32(t36,0x4:I32))
PUT(32) = LDle:I32(Add32(t36,0x8:I32))
PUT(36) = LDle:I32(Add32(t36,0xC:I32))
PUT(40) = LDle:I32(Add32(t36,0x10:I32))
PUT(68) = LDle:I32(Add32(t36,0x14:I32))
PUT(60) = Add32(t35,0x18:I32)
PUT(68) = GET:I32(68)
PUT(68) = GET:I32(68); exit-Return
*****
I'm very unsure of what is happening.
--
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