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ARM: Attempt to subtract with overflow error when object has no symbol at address 0 #176
Description
This object has its first function start at offset 0x68, but at offset 0 has a .text symbol. It has no $a/$t/$d mapping symbol for this .text symbol since it's not a function.
$ readelf -s secure_area.o --wide
Symbol table '.symtab' contains 38 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 NOTYPE LOCAL DEFAULT 1 .text
2: 00000068 0 NOTYPE LOCAL DEFAULT 1 $t
3: 000000d0 0 NOTYPE LOCAL DEFAULT 1 $t
4: 0000013e 0 NOTYPE LOCAL DEFAULT 1 $t
5: 000001ae 0 NOTYPE LOCAL DEFAULT 1 $t
6: 00000220 0 NOTYPE LOCAL DEFAULT 1 $t
7: 000002a0 0 NOTYPE LOCAL DEFAULT 1 $t
8: 00000304 0 NOTYPE LOCAL DEFAULT 1 $t
9: 00000368 0 NOTYPE LOCAL DEFAULT 1 $t
10: 000003e4 0 NOTYPE LOCAL DEFAULT 1 $t
11: 00000458 0 NOTYPE LOCAL DEFAULT 1 $t
12: 000004ba 0 NOTYPE LOCAL DEFAULT 1 $t
13: 00000520 0 NOTYPE LOCAL DEFAULT 1 $t
14: 00000594 0 NOTYPE LOCAL DEFAULT 1 $t
15: 000005f0 0 NOTYPE LOCAL DEFAULT 1 $t
16: 00000660 0 NOTYPE LOCAL DEFAULT 1 $t
17: 000006c8 0 NOTYPE LOCAL DEFAULT 1 $t
18: 00000732 0 NOTYPE LOCAL DEFAULT 1 $t
19: 000007a2 0 NOTYPE LOCAL DEFAULT 1 $t
20: 00000068 4 FUNC GLOBAL DEFAULT 1 RLUnCompReadNormalWrite8bit
21: 000000d0 4 FUNC GLOBAL DEFAULT 1 CpuSet
22: 0000013e 4 FUNC GLOBAL DEFAULT 1 Halt
23: 000001ae 4 FUNC GLOBAL DEFAULT 1 GetCRC16
24: 00000220 4 FUNC GLOBAL DEFAULT 1 BitUnPack
25: 000002a0 4 FUNC GLOBAL DEFAULT 1 CpuFastSet
26: 00000304 4 FUNC GLOBAL DEFAULT 1 VBlankIntrWait
27: 00000368 4 FUNC GLOBAL DEFAULT 1 LZ77UnCompReadByCallbackWrite16bit
28: 000003e4 4 FUNC GLOBAL DEFAULT 1 IntrWait
29: 00000458 4 FUNC GLOBAL DEFAULT 1 IsDebugger
30: 000004ba 4 FUNC GLOBAL DEFAULT 1 HuffUnCompReadByCallback
31: 00000520 4 FUNC GLOBAL DEFAULT 1 Sqrt
32: 00000594 6 FUNC GLOBAL DEFAULT 1 Mod
33: 000005f0 4 FUNC GLOBAL DEFAULT 1 LZ77UnCompReadNormalWrite8bit
34: 00000660 4 FUNC GLOBAL DEFAULT 1 SoftReset
35: 000006c8 4 FUNC GLOBAL DEFAULT 1 Div
36: 00000732 4 FUNC GLOBAL DEFAULT 1 WaitByLoop
37: 000007a2 4 FUNC GLOBAL DEFAULT 1 RLUnCompReadByCallbackWrite16bit
When trying to open this object, the following line:
objdiff/objdiff-core/src/arch/arm.rs
Line 202 in 311de88
Produces this error on latest commit:
index out of bounds: the len is 18 but the index is 18446744073709551615
I'm not sure if this object is even valid (it was produced by dsd not mwcc, and mwld also crashes on it, so it might be a dsd issue?), but objdiff 2.7 could display the object without erroring out.
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