>>>>> On Wed, 29 Oct 2003 13:15:17 -0500, Daniel Jacobowitz <dan@debian.org> said:
dan> Atsushi-san's program would not even link with a binutils that
dan> didn't support multiple GOTs; I guess that something is going
dan> wrong with that support.
Yes, I guess too.
dan> I don't suppose you could provide a testcase?
I wrote a short script to generate a testcase. Running attached awk
script create src0.c, src1.c, ..., src3.c.
$ mips-linux-gcc -c src[0-4].c
$ mips-linux-gcc -o bigapp src[0-4].o
This bigapp program compiled with binutils-2.14, gcc-3.3.2, uClibc
0.9.21 is corrupted.
Here is some outputs from readelf:
$ mips-linux-readelf -S bigapp
There are 31 section headers, starting at offset 0x36ad78:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .interp PROGBITS 004000f4 0000f4 00000d 00 A 0 0 1
[ 2] .reginfo MIPS_REGINFO 00400104 000104 000018 18 A 0 0 4
[ 3] .dynamic DYNAMIC 0040011c 00011c 0000d8 08 A 6 0 4
[ 4] .hash HASH 004001f4 0001f4 028784 04 A 5 0 4
[ 5] .dynsym DYNSYM 00428978 028978 061c40 10 A 6 1 4
[ 6] .dynstr STRTAB 0048a5b8 08a5b8 041da5 00 A 0 0 1
[ 7] .init PROGBITS 004cc370 0cc370 0000ac 00 AX 0 0 4
[ 8] .text PROGBITS 004cc420 0cc420 1b7d60 00 AX 0 0 16
[ 9] .fini PROGBITS 00684180 284180 00005c 00 AX 0 0 4
[10] .rodata PROGBITS 006841e0 2841e0 000010 00 A 0 0 16
[11] .data PROGBITS 10000000 285000 000010 00 WA 0 0 16
[12] .rld_map PROGBITS 10000010 285010 000004 00 WA 0 0 4
[13] .eh_frame PROGBITS 10000014 285014 000004 00 A 0 0 4
[14] .ctors PROGBITS 10000018 285018 000008 00 WA 0 0 4
[15] .dtors PROGBITS 10000020 285020 000008 00 WA 0 0 4
[16] .jcr PROGBITS 10000028 285028 000004 00 WA 0 0 4
[17] .got PROGBITS 10000030 285030 02245c 04 WAp 0 0 16
[18] .sbss NOBITS 1002248c 2a7490 000000 00 WAp 0 0 1
[19] .bss NOBITS 10022490 2a7490 000020 00 WA 0 0 16
[20] .comment PROGBITS 00000000 2a7490 0000a2 00 0 0 1
[21] .debug_aranges MIPS_DWARF 00000000 2a7538 000020 00 0 0 8
[22] .debug_info MIPS_DWARF 00000000 2a7558 000069 00 0 0 1
[23] .debug_abbrev MIPS_DWARF 00000000 2a75c1 000014 00 0 0 1
[24] .debug_line MIPS_DWARF 00000000 2a75d5 000044 00 0 0 1
[25] .pdr PROGBITS 00000000 2a761c 0c3660 00 0 0 4
[26] .rel.dyn REL 004cc360 0cc360 000010 08 A 5 0 16
[27] .mdebug.abi32 PROGBITS 00000000 36ac7c 000000 00 0 0 1
[28] .shstrtab STRTAB 00000000 36ac7c 0000fb 00 0 0 1
[29] .symtab SYMTAB 00000000 36b250 0620a0 10 30 45 4
[30] .strtab STRTAB 00000000 3cd2f0 041ee7 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
$ mips-linux-readelf -r bigapp
Relocation section '.rel.dyn' at offset 0xcc360 contains 2 entries:
Offset Info Type Sym.Value Sym. Name
00000000 00000000 R_MIPS_NONE
1001f4f0 00314703 R_MIPS_REL32 004cc490 getpid
$ mips-linux-readelf -x 17 bigapp | grep 1001f4f0
0x1001f4f0 004cc490 005ea570 00655ba0 0062c9e0 .L...^.p.e[..b..
$ mips-linux-readelf -s bigapp | grep getpid
12615: 004cc490 0 FUNC GLOBAL DEFAULT UND getpid
4109: 004cc490 0 FUNC GLOBAL DEFAULT UND getpid
Strangely the bigapp works correct if I compiled it with glibc 2.2.5.
Here is some outputs from readelf on bigapp.glibc:
$ mips-linux-readelf -S bigapp.glibc
There are 36 section headers, starting at offset 0x378644:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .interp PROGBITS 00400114 000114 00000d 00 A 0 0 1
[ 2] .note.ABI-tag NOTE 00400130 000130 000020 00 A 0 0 16
[ 3] .reginfo MIPS_REGINFO 00400150 000150 000018 18 A 0 0 4
[ 4] .dynamic DYNAMIC 00400168 000168 0000f0 08 A 7 0 4
[ 5] .hash HASH 00400258 000258 028764 04 A 6 0 4
[ 6] .dynsym DYNSYM 004289bc 0289bc 061bc0 10 A 7 1 4
[ 7] .dynstr STRTAB 0048a57c 08a57c 041d6d 00 A 0 0 1
[ 8] .gnu.version VERSYM 004cc2ea 0cc2ea 00c378 02 A 6 0 2
[ 9] .gnu.version_r VERNEED 004d8664 0d8664 000020 00 A 7 1 4
[10] .init PROGBITS 004d86a0 0d86a0 0000ac 00 AX 0 0 4
[11] .text PROGBITS 004d8750 0d8750 1b7d40 00 AX 0 0 16
[12] .fini PROGBITS 00690490 290490 00005c 00 AX 0 0 4
[13] .rodata PROGBITS 006904f0 2904f0 000020 00 A 0 0 16
[14] .data PROGBITS 10000000 291000 000020 00 WA 0 0 16
[15] .rld_map PROGBITS 10000020 291020 000004 00 WA 0 0 4
[16] .eh_frame PROGBITS 10000024 291024 000004 00 A 0 0 4
[17] .ctors PROGBITS 10000028 291028 000008 00 WA 0 0 4
[18] .dtors PROGBITS 10000030 291030 000008 00 WA 0 0 4
[19] .jcr PROGBITS 10000038 291038 000004 00 WA 0 0 4
[20] .got PROGBITS 10000040 291040 022460 04 WAp 0 0 16
[21] .sbss NOBITS 100224a0 2b34a0 000000 00 WAp 0 0 1
[22] .bss NOBITS 100224a0 2b34a0 000020 00 WA 0 0 16
[23] .comment PROGBITS 00000000 2b34a0 0000b4 00 0 0 1
[24] .debug_aranges MIPS_DWARF 00000000 2b3558 000058 00 0 0 8
[25] .debug_pubnames MIPS_DWARF 00000000 2b35b0 000025 00 0 0 1
[26] .debug_info MIPS_DWARF 00000000 2b35d5 000c55 00 0 0 1
[27] .debug_abbrev MIPS_DWARF 00000000 2b422a 00012b 00 0 0 1
[28] .debug_line MIPS_DWARF 00000000 2b4355 00028e 00 0 0 1
[29] .debug_str MIPS_DWARF 00000000 2b45e3 000960 01 MS 0 0 1
[30] .pdr PROGBITS 00000000 2b4f44 0c35c0 00 0 0 4
[31] .mdebug.abi32 PROGBITS 00000000 378504 000000 00 0 0 1
[32] .rel.dyn REL 004d8690 0d8690 000010 08 A 6 0 16
[33] .shstrtab STRTAB 00000000 378504 000140 00 0 0 1
[34] .symtab SYMTAB 00000000 378be4 062200 10 35 59 4
[35] .strtab STRTAB 00000000 3dade4 04204e 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
$ mips-linux-readelf -r bigapp.glibc
Relocation section '.rel.dyn' at offset 0xd8690 contains 2 entries:
Offset Info Type Sym.Value Sym. Name
00000000 00000000 R_MIPS_NONE
1001c3c0 00340403 R_MIPS_REL32 00000000 getpid
$ mips-linux-readelf -x 20 bigapp.glibc | grep 1001c3c0
0x1001c3c0 00000000 0060d3e0 0063cd10 00608f70 .....`...c...`.p
$ mips-linux-readelf -s bigapp.glibc | grep getpid
13316: 00000000 0 FUNC GLOBAL DEFAULT UND getpid@GLIBC_2.0 (2)
2943: 00000000 0 FUNC GLOBAL DEFAULT UND getpid@@GLIBC_2.0
Is there other informations I can provide?
---
Atsushi Nemoto
#!/bin/awk -f
BEGIN {
nfile = 5;
nfunc = 5000;
for (j = 0; j < nfile; j++) {
fname = "src" j ".c";
printf("/* %s */\n", fname) > fname;
for (i = 0; i < nfunc; i++) {
printf("void func%d_%d(void) {}\n", j, i, i) >> fname;
}
printf("int func%d(void) {\n", j) >> fname;
for (i = 0; i < nfunc; i++) {
printf("func%d_%d();\n", j, i) >> fname;
}
printf("return getpid();\n") >> fname;
printf("}\n") >> fname;
if (j == 0) {
printf("int main(int argc, char **argv) {\n") > fname;
for (i = 0; i < nfile; i++) {
printf("printf(\"%%d\\n\", func%d());\n", i) >> fname;
}
printf("return 0;\n") >> fname;
printf("}\n") >> fname;
}
close(fname);
}
}
