• State Suggested Answer
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 21 subscribers
  • Views 2259 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Linker script not working as expected when trying to compile elf file - cpp, exceptions

CookieDoughMixer

Hello all,

I am currently working on adding cpp exception support to loadable elf binaries in my project. The current issue is that, even though I have mentioned the sections for exidx and extab in the linker script, the actual elf file generated does not follow the linker script.

SECTIONS
{
.text 0x00000000 :
{
_stext_flash = . ;
*(.text)
*(.text.*)
*(.gnu.warning)
*(.stub)
*(.glue_7)
*(.glue_7t)
*(.jcr)

*(.gnu.linkonce.t.*)
*(.init) /* Old ABI */
*(.fini) /* Old ABI */
_etext_flash = . ;
}

.rodata :
{
_srodata = . ;
*(.rodata)
*(.rodata1)
*(.rodata.*)
*(.gnu.linkonce.r*)
_erodata = . ;
_eronly = .;
}

.data 0x00000000 :
{
_sdata = . ;
*(.data)
*(.data1)
*(.data.*)
*(.gnu.linkonce.d*)
_edata = . ;
}

.ctors :
{
_sctors = . ;
*(.ctors) /* Old ABI: Unallocated */
*(.init_array) /* New ABI: Allocated */
_ectors = . ;
}

.dtors :
{
_sdtors = . ;
*(.dtors) /* Old ABI: Unallocated */
*(.fini_array) /* New ABI: Allocated */
_edtors = . ;
}

.ARM.extab :
{
*(.ARM.extab*)
}

.ARM.exidx :
{
__exidx_start = . ;
*(.ARM.exidx*)
__exidx_end = . ;
}

.bss :
{
_sbss = . ;
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.b*)
*(COMMON)
_ebss = . ;
}

/* Stabs debugging sections. */
.
.
.
}

But, when I checked the sections created using readelf -S, it has multiple section of text, extab, exidx even though I have grouped them together in the linker script.

[135] .group GROUP 00000000 000474 000008 04 392 10201 4
[136] .group GROUP 00000000 00047c 000008 04 392 10549 4
[137] .group GROUP 00000000 000484 000008 04 392 10317 4
[138] .group GROUP 00000000 00048c 000008 04 392 11364 4
[139] .group GROUP 00000000 000494 000008 04 392 10312 4
[140] .group GROUP 00000000 00049c 000008 04 392 11481 4
[141] .group GROUP 00000000 0004a4 000010 04 392 11541 4
[142] .text PROGBITS 00000000 0004b8 06349c 00 AX 0 0 8
[143] .rel.text REL 00000000 44c514 034088 08 I 392 142 4
[144] .text._ZN11C[...] PROGBITS 00000000 063954 000002 00 AXG 0 0 2
[145] .text._ZN11C[...] PROGBITS 00000000 063958 000024 00 AXG 0 0 4
[146] .rel.text._Z[...] REL 00000000 48059c 000020 08 I 392 145 4
[147] .text._ZNK10[...] PROGBITS 00000000 06397c 000014 00 AXG 0 0 4
[148] .rodata PROGBITS 00000018 063990 0241e3 00 A 0 0 8
[149] .rel.rodata REL 00000000 4805bc 001c30 08 I 392 148 4
[150] .ARM.extab.t[...] PROGBITS 00000000 087b73 000000 00 AG 0 0 1
[151] .ARM.exidx.t[...] ARM_EXIDX 00000000 087b74 000008 00 ALG 144 0 4
[152] .rel.ARM.exi[...] REL 00000000 4821ec 000008 08 I 392 151 4
[153] .ARM.extab.t[...] PROGBITS 00000000 087b7c 00000c 00 AG 0 0 4
[154] .ARM.exidx.t[...] ARM_EXIDX 00000000 087b88 000008 00 ALG 145 0 4
[155] .rel.ARM.exi[...] REL 00000000 4821f4 000018 08 I 392 154 4
[156] .rodata._ZTSv PROGBITS 00000000 087b90 000002 00 AG 0 0 4
[157] .rodata._ZTSPv PROGBITS 00000000 087b94 000003 00 AG 0 0 4
[158] .rodata._ZTSPKv PROGBITS 00000000 087b98 000004 00 AG 0 0 4
[159] .rodata._ZTSb PROGBITS 00000000 087b9c 000002 00 AG 0 0 4
[160] .rodata._ZTSPb PROGBITS 00000000 087ba0 000003 00 AG 0 0 4
[161] .rodata._ZTSPKb PROGBITS 00000000 087ba4 000004 00 AG 0 0 4
[162] .rodata._ZTSw PROGBITS 00000000 087ba8 000002 00 AG 0 0 4

Is there something wrong with my linker script? Any guidance would you very helpful.

Incase I dont add any cpp code, the sections are fine,

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 000038 001f68 00 AX 0 0 8
[ 2] .rel.text REL 00000000 032c4c 000598 08 I 27 1 4
[ 3] .rodata PROGBITS 00001f68 001fa0 000355 00 A 0 0 8
[ 4] .data PROGBITS 00000000 0022f5 000005 00 WA 0 0 1
[ 5] .ctors PROGBITS 00000005 0022fa 000000 00 W 0 0 1
[ 6] .dtors PROGBITS 00000005 0022fa 000000 00 W 0 0 1
[ 7] .ARM.extab PROGBITS 00000005 0022fa 000000 00 A 0 0 1
[ 8] .ARM.exidx ARM_EXIDX 00000008 0022fc 000008 00 AL 1 0 4
[ 9] .rel.ARM.exidx REL 00000000 0331e4 000008 08 I 27 8 4
[10] .bss NOBITS 00000010 002304 000000 00 WA 0 0 1
[11] .comment PROGBITS 00000000 002304 001780 01 MS 0 0 1
[12] .ARM.attributes ARM_ATTRIBUTES 00000000 003a84 000038 00 0 0 1
[13] .debug_abbrev PROGBITS 00000000 003abc 0040ba 00 0 0 1
[14] .debug_info PROGBITS 00000000 007b76 013253 00 0 0 1
[15] .rel.debug_info REL 00000000 0331ec 00a1f0 08 I 27 14 4
[16] .debug_line PROGBITS 00000000 01adc9 004118 00 0 0 1
[17] .rel.debug_line REL 00000000 03d3dc 0001c0 08 I 27 16 4
[18] .debug_aranges PROGBITS 00000000 01eee8 000640 00 0 0 8
[19] .rel.debug_a[...] REL 00000000 03d59c 000340 08 I 27 18 4
[20] .debug_loc PROGBITS 00000000 01f528 00281e 00 0 0 1
[21] .rel.debug_loc REL 00000000 03d8dc 002d98 08 I 27 20 4
[22] .debug_ranges PROGBITS 00000000 021d46 000480 00 0 0 1
[23] .rel.debug_ranges REL 00000000 040674 000560 08 I 27 22 4
[24] .debug_str PROGBITS 00000000 0221c6 00df42 01 MS 0 0 1
[25] .debug_frame PROGBITS 00000000 030108 000af4 00 0 0 4
[26] .rel.debug_frame REL 00000000 040bd4 000490 08 I 27 25 4
[27] .symtab SYMTAB 00000000 030bfc 0016d0 10 28 252 4
[28] .strtab STRTAB 00000000 0322cc 000980 00 0 0 1
[29] .shstrtab STRTAB 00000000 041064 0000f7 00 0 0 1