Tamanho incorreto da função no objeto ARM ELF
readelf output do arquivo de objeto:
Symbol table '.symtab' contains 15 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 FILE LOCAL DEFAULT ABS fp16.c
2: 00000000 0 SECTION LOCAL DEFAULT 1
3: 00000000 0 SECTION LOCAL DEFAULT 3
4: 00000000 0 SECTION LOCAL DEFAULT 4
5: 00000000 0 NOTYPE LOCAL DEFAULT 1 $t
6: 00000001 194 FUNC LOCAL DEFAULT 1 __gnu_f2h_internal
7: 00000010 0 NOTYPE LOCAL DEFAULT 5 $d
8: 00000000 0 SECTION LOCAL DEFAULT 5
9: 00000000 0 SECTION LOCAL DEFAULT 7
10: 000000c5 78 FUNC GLOBAL HIDDEN 1 __gnu_h2f_internal
11: 00000115 4 FUNC GLOBAL HIDDEN 1 __gnu_f2h_ieee
12: 00000119 4 FUNC GLOBAL HIDDEN 1 __gnu_h2f_ieee
13: 0000011d 4 FUNC GLOBAL HIDDEN 1 __gnu_f2h_alternative
14: 00000121 4 FUNC GLOBAL HIDDEN 1 __gnu_h2f_alternative
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00000000 000034 000124 00 AX 0 0 4
[ 2] .rel.text REL 00000000 00058c 000010 08 9 1 4
[ 3] .data PROGBITS 00000000 000158 000000 00 WA 0 0 1
[ 4] .bss NOBITS 00000000 000158 000000 00 WA 0 0 1
[ 5] .debug_frame PROGBITS 00000000 000158 00008c 00 0 0 4
[ 6] .rel.debug_frame REL 00000000 00059c 000060 08 9 5 4
[ 7] .ARM.attributes ARM_ATTRIBUTES 00000000 0001e4 00002f 00 0 0 1
[ 8] .shstrtab STRTAB 00000000 000213 000051 00 0 0 1
[ 9] .symtab SYMTAB 00000000 00041c 0000f0 10 10 10 4
[10] .strtab STRTAB 00000000 00050c 00007e 00 0 0 1
Relocation section '.rel.text' at offset 0x58c contains 2 entries:
Offset Info Type Sym.Value Sym. Name
0000011a 00000a66 R_ARM_THM_JUMP11 000000c5 __gnu_h2f_internal
00000122 00000a66 R_ARM_THM_JUMP11 000000c5 __gnu_h2f_internal
Relocation section '.rel.debug_frame' at offset 0x59c contains 12 entries:
Offset Info Type Sym.Value Sym. Name
00000014 00000802 R_ARM_ABS32 00000000 .debug_frame
00000018 00000202 R_ARM_ABS32 00000000 .text
00000040 00000802 R_ARM_ABS32 00000000 .debug_frame
00000044 00000202 R_ARM_ABS32 00000000 .text
00000050 00000802 R_ARM_ABS32 00000000 .debug_frame
00000054 00000202 R_ARM_ABS32 00000000 .text
00000060 00000802 R_ARM_ABS32 00000000 .debug_frame
00000064 00000202 R_ARM_ABS32 00000000 .text
00000070 00000802 R_ARM_ABS32 00000000 .debug_frame
00000074 00000202 R_ARM_ABS32 00000000 .text
00000080 00000802 R_ARM_ABS32 00000000 .debug_frame
00000084 00000202 R_ARM_ABS32 00000000 .text
Estrutura da seção .text como eu a entendo:
A seção .text tem tamanho de 0x124
0x0: unknown byte
0x1-0xC3: __gnu_f2h_internal
0xC3-0xC5: two unknown bytes between those functions (btw what are those?)
0xC5-0x113: __gnu_h2f_internal
0x113-0x115: two unknown bytes between those functions
0x115-0x119: __gnu_f2h_ieee
0x119-0x11D: __gnu_h2f_ieee
0x11D-0x121: __gnu_f2h_alternative
0x121-0x125: __gnu_h2f_alternative // section is only 0x124, what happened to the missing byte?
Observe que o tamanho da seção é 0x124 e a última função termina em 0x125, o que aconteceu com o byte ausente?
Obrigado.