GHC 9.4.5 places data into .text
I'm trying to build GHC with my linker, mold, and noticed that GHC places data into .text. I built GHC using Hadrian without any special option (I built it just with ./boot && ./configure && ./hadrian/build -j). Please take a look at the following readelf dump.
$ readelf -WSs _build/stage1/rts/build/cmm/StgStdThunks.thr_dyn_o
There are 10 section headers, starting at offset 0x2328:
Section Headers:
[Nr] Name Type Address Off Size ES Flg Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 0000000000000000 000040 00118b 00 AX 0 0 8
[ 2] .rela.text RELA 0000000000000000 001be8 0006f0 18 I 7 1 8
[ 3] .data PROGBITS 0000000000000000 0011cb 000000 00 WA 0 0 1
[ 4] .bss NOBITS 0000000000000000 0011cb 000000 00 WA 0 0 1
[ 5] .note.GNU-stack PROGBITS 0000000000000000 0011cb 000000 00 0 0 1
[ 6] .comment PROGBITS 0000000000000000 0011cb 000012 01 MS 0 0 1
[ 7] .symtab SYMTAB 0000000000000000 0011e0 000570 18 8 1 8
[ 8] .strtab STRTAB 0000000000000000 001750 000493 00 0 0 1
[ 9] .shstrtab STRTAB 0000000000000000 0022d8 00004a 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), l (large), p (processor specific)
Symbol table '.symtab' contains 58 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000010 101 OBJECT GLOBAL DEFAULT 1 stg_sel_0_upd_info
2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND _GLOBAL_OFFSET_TABLE_
3: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_upd_frame_info
4: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_0_fast
5: 0000000000000088 101 OBJECT GLOBAL DEFAULT 1 stg_sel_1_upd_info
6: 0000000000000100 101 OBJECT GLOBAL DEFAULT 1 stg_sel_2_upd_info
7: 0000000000000178 101 OBJECT GLOBAL DEFAULT 1 stg_sel_3_upd_info
8: 00000000000001f0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_4_upd_info
9: 0000000000000268 101 OBJECT GLOBAL DEFAULT 1 stg_sel_5_upd_info
10: 00000000000002e0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_6_upd_info
11: 0000000000000358 101 OBJECT GLOBAL DEFAULT 1 stg_sel_7_upd_info
12: 00000000000003d0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_8_upd_info
13: 0000000000000448 101 OBJECT GLOBAL DEFAULT 1 stg_sel_9_upd_info
14: 00000000000004c0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_10_upd_info
15: 0000000000000538 101 OBJECT GLOBAL DEFAULT 1 stg_sel_11_upd_info
16: 00000000000005b0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_12_upd_info
17: 0000000000000628 101 OBJECT GLOBAL DEFAULT 1 stg_sel_13_upd_info
18: 00000000000006a0 101 OBJECT GLOBAL DEFAULT 1 stg_sel_14_upd_info
19: 0000000000000718 104 OBJECT GLOBAL DEFAULT 1 stg_sel_15_upd_info
20: 0000000000000790 81 OBJECT GLOBAL DEFAULT 1 stg_sel_0_noupd_info
21: 00000000000007f8 81 OBJECT GLOBAL DEFAULT 1 stg_sel_1_noupd_info
22: 0000000000000860 81 OBJECT GLOBAL DEFAULT 1 stg_sel_2_noupd_info
23: 00000000000008c8 81 OBJECT GLOBAL DEFAULT 1 stg_sel_3_noupd_info
24: 0000000000000930 81 OBJECT GLOBAL DEFAULT 1 stg_sel_4_noupd_info
25: 0000000000000998 81 OBJECT GLOBAL DEFAULT 1 stg_sel_5_noupd_info
26: 0000000000000a00 81 OBJECT GLOBAL DEFAULT 1 stg_sel_6_noupd_info
27: 0000000000000a68 81 OBJECT GLOBAL DEFAULT 1 stg_sel_7_noupd_info
28: 0000000000000ad0 81 OBJECT GLOBAL DEFAULT 1 stg_sel_8_noupd_info
29: 0000000000000b38 81 OBJECT GLOBAL DEFAULT 1 stg_sel_9_noupd_info
30: 0000000000000ba0 81 OBJECT GLOBAL DEFAULT 1 stg_sel_10_noupd_info
31: 0000000000000c08 81 OBJECT GLOBAL DEFAULT 1 stg_sel_11_noupd_info
32: 0000000000000c70 81 OBJECT GLOBAL DEFAULT 1 stg_sel_12_noupd_info
33: 0000000000000cd8 81 OBJECT GLOBAL DEFAULT 1 stg_sel_13_noupd_info
34: 0000000000000d40 81 OBJECT GLOBAL DEFAULT 1 stg_sel_14_noupd_info
35: 0000000000000da8 84 OBJECT GLOBAL DEFAULT 1 stg_sel_15_noupd_info
36: 0000000000000e10 42 OBJECT GLOBAL DEFAULT 1 stg_ap_1_upd_info
37: 0000000000000e50 46 OBJECT GLOBAL DEFAULT 1 stg_ap_2_upd_info
38: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_p_fast
39: 0000000000000e90 50 OBJECT GLOBAL DEFAULT 1 stg_ap_3_upd_info
40: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_pp_fast
41: 0000000000000ed8 54 OBJECT GLOBAL DEFAULT 1 stg_ap_4_upd_info
42: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_ppp_fast
43: 0000000000000f20 58 OBJECT GLOBAL DEFAULT 1 stg_ap_5_upd_info
44: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_pppp_fast
45: 0000000000000f70 62 OBJECT GLOBAL DEFAULT 1 stg_ap_6_upd_info
46: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_ppppp_fast
47: 0000000000000fc0 73 OBJECT GLOBAL DEFAULT 1 stg_ap_7_upd_info
48: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_ap_pppppp_fast
49: 0000000000001010 51 FUNC GLOBAL DEFAULT 1 stg_do_unpack_cstring
50: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_bh_upd_frame_info
51: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND ghczmprim_GHCziCString_unpackCStringzh_info
52: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stg_gc_prim_pp
53: 0000000000001058 115 OBJECT GLOBAL DEFAULT 1 stg_unpack_cstring_info
54: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND newCAF
55: 00000000000010d0 51 FUNC GLOBAL DEFAULT 1 stg_do_unpack_cstring_utf8
56: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND ghczmprim_GHCziCString_unpackCStringUtf8zh_info
57: 0000000000001118 115 OBJECT GLOBAL DEFAULT 1 stg_unpack_cstring_utf8_infoSection 1 is .text, and many symbols starting with stg_ are defined for that section. However, the symbol type of these symbols are not STT_FUNC but STT_OBJECT. If they are functions, they should have had STT_FUNC.
Normally, the linker doesn't care about symbol type, but when it creates copy relocations, the symbol type matters. So setting a correct symbol type is important.