Strip broke for me in 2.15...
David Daney
ddaney@avtrex.com
Thu May 20 01:37:00 GMT 2004
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Thu May 20 01:37:00 GMT 2004
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I am running on mipsel-linux w/ glibc-2.2.5. I am a bit fuzzy on the terminology, but I am calling the things listed under Program Headers from readelf -e "Program Headers" I apologize if there is a better term. I have a program that was compiled and linked with gcc-3.3.1/binutils-2.14. It runs fine. I recently upgraded to binutils 2.15 to correct problems in the linker unrelated to stripping. My problem is that stripping the executable with strip-2.15 creates an unrunnable image. But strip-2.14 create a good image. I am theorizing that the problem is that strip-2.15 that the LOAD program headers are aligned to the alignment specified for the first section in the header rather than the alignment specified in the header. This causes ld.so to map that header incorrectly. I see two possibilities: 1) ld-2.2.5.so is bug free and strip-2.15 is generating an illegally formed executable image. 2) There are no particular alignment requirements for Program headers within an executable image, and ld-2.2.5.so does not handle some cases properly. Q: Which is it? Here is the output from readelf -e from the same program stripped with strip-2.14 and then strip-2.15. Note that the section sizes are all the same and the program header sizes are the same. The only difference is that the file offsets are aligned differently. [daney@dl smallroot]$ mipsel-linux-readelf -e xilleon_remote ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: MIPS R3000 Version: 0x1 Entry point address: 0x4234c0 Start of program headers: 52 (bytes into file) Start of section headers: 1790576 (bytes into file) Flags: 0x50000007, noreorder, pic, cpic, mips32 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 8 Size of section headers: 40 (bytes) Number of section headers: 31 Section header string table index: 30 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 00400134 000134 00000d 00 A 0 0 1 [ 2] .note.ABI-tag NOTE 00400150 000150 000020 00 A 0 0 16 [ 3] .reginfo MIPS_REGINFO 00400170 000170 000018 18 A 0 0 4 [ 4] .dynamic DYNAMIC 00400188 000188 000150 08 A 7 0 4 [ 5] .hash HASH 004002d8 0002d8 0050fc 04 A 6 0 4 [ 6] .dynsym DYNSYM 004053d4 0053d4 00c380 10 A 7 1 4 [ 7] .dynstr STRTAB 00411754 011754 00ff63 00 A 0 0 1 [ 8] .gnu.version VERSYM 004216b8 0216b8 001870 02 A 6 0 2 [ 9] .gnu.version_r VERNEED 00422f28 022f28 0000c0 00 A 7 4 4 [10] .init PROGBITS 00423410 023410 0000a4 00 AX 0 0 4 [11] .text PROGBITS 004234c0 0234c0 124320 00 AX 0 0 16 [12] .fini PROGBITS 005477e0 1477e0 000058 00 AX 0 0 4 [13] .rodata PROGBITS 00547840 147840 02d080 00 A 0 0 16 [14] .eh_frame_hdr PROGBITS 005748c0 1748c0 002cc4 00 A 0 0 4 [15] .data PROGBITS 10000000 178000 009d20 00 WA 0 0 16 [16] .rld_map PROGBITS 10009d20 181d20 000004 00 WA 0 0 4 [17] .eh_frame PROGBITS 10009d24 181d24 00dff8 00 A 0 0 4 [18] .gcc_except_table PROGBITS 10017d1c 18fd1c 0048d7 00 A 0 0 4 [19] .ctors PROGBITS 1001c5f4 1945f4 000010 00 WA 0 0 4 [20] .dtors PROGBITS 1001c604 194604 000008 00 WA 0 0 4 [21] .jcr PROGBITS 1001c60c 19460c 000004 00 WA 0 0 4 [22] .got PROGBITS 1001c610 194610 003108 04 WAp 0 0 16 [23] .sbss NOBITS 1001f718 197718 000000 00 WAp 0 0 1 [24] .bss NOBITS 1001f720 197720 001740 00 WA 0 0 16 [25] .comment PROGBITS 00000000 197720 00068a 00 0 0 1 [26] .pdr PROGBITS 00000000 197dac 01d380 00 0 0 4 [27] .note NOTE 00000000 1b512c 00003c 00 0 0 1 [28] .rel.dyn REL 00422fe8 022fe8 000428 08 A 6 0 4 [29] .mdebug.abi32 PROGBITS 00000000 1b5168 000000 00 0 0 1 [30] .shstrtab STRTAB 00000000 1b5168 000106 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) Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align PHDR 0x000034 0x00400034 0x00400034 0x00100 0x00100 R E 0x4 INTERP 0x000134 0x00400134 0x00400134 0x0000d 0x0000d R 0x1 [Requesting program interpreter: /lib/ld.so.1] REGINFO 0x000170 0x00400170 0x00400170 0x00018 0x00018 R 0x4 LOAD 0x000000 0x00400000 0x00400000 0x177584 0x177584 R E 0x1000 LOAD 0x178000 0x10000000 0x10000000 0x1f718 0x20e60 RW 0x1000 DYNAMIC 0x000188 0x00400188 0x00400188 0x2152f 0x2152f RWE 0x4 NOTE 0x000150 0x00400150 0x00400150 0x00020 0x00020 R 0x10 GNU_EH_FRAME 0x1748c0 0x005748c0 0x005748c0 0x02cc4 0x02cc4 R 0x4 Section to Segment mapping: Segment Sections... 00 01 .interp 02 .reginfo 03 .interp .note.ABI-tag .reginfo .dynamic .hash .dynsym .dynstr .gnu.version .gnu.version_r .init .text .fini .rodata .eh_frame_hdr .rel.dyn 04 .data .rld_map .eh_frame .gcc_except_table .ctors .dtors .jcr .got .bss 05 .dynamic .hash .dynsym .dynstr 06 .note.ABI-tag 07 .eh_frame_hdr [root@dl smallroot]# mipsel-linux-readelf -e root/avtrex/demo/xilleon_remote ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: MIPS R3000 Version: 0x1 Entry point address: 0x4234c0 Start of program headers: 52 (bytes into file) Start of section headers: 1787904 (bytes into file) Flags: 0x50000007, noreorder, pic, cpic, mips32 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 8 Size of section headers: 40 (bytes) Number of section headers: 31 Section header string table index: 30 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 00400134 000134 00000d 00 A 0 0 1 [ 2] .note.ABI-tag NOTE 00400150 000150 000020 00 A 0 0 16 [ 3] .reginfo MIPS_REGINFO 00400170 000170 000018 18 A 0 0 4 [ 4] .dynamic DYNAMIC 00400188 000188 000150 08 A 7 0 4 [ 5] .hash HASH 004002d8 0002d8 0050fc 04 A 6 0 4 [ 6] .dynsym DYNSYM 004053d4 0053d4 00c380 10 A 7 1 4 [ 7] .dynstr STRTAB 00411754 011754 00ff63 00 A 0 0 1 [ 8] .gnu.version VERSYM 004216b8 0216b8 001870 02 A 6 0 2 [ 9] .gnu.version_r VERNEED 00422f28 022f28 0000c0 00 A 7 4 4 [10] .init PROGBITS 00423410 023410 0000a4 00 AX 0 0 4 [11] .text PROGBITS 004234c0 0234c0 124320 00 AX 0 0 16 [12] .fini PROGBITS 005477e0 1477e0 000058 00 AX 0 0 4 [13] .rodata PROGBITS 00547840 147840 02d080 00 A 0 0 16 [14] .eh_frame_hdr PROGBITS 005748c0 1748c0 002cc4 00 A 0 0 4 [15] .data PROGBITS 10000000 177590 009d20 00 WA 0 0 16 [16] .rld_map PROGBITS 10009d20 1812b0 000004 00 WA 0 0 4 [17] .eh_frame PROGBITS 10009d24 1812b4 00dff8 00 A 0 0 4 [18] .gcc_except_table PROGBITS 10017d1c 18f2ac 0048d7 00 A 0 0 4 [19] .ctors PROGBITS 1001c5f4 193b84 000010 00 WA 0 0 4 [20] .dtors PROGBITS 1001c604 193b94 000008 00 WA 0 0 4 [21] .jcr PROGBITS 1001c60c 193b9c 000004 00 WA 0 0 4 [22] .got PROGBITS 1001c610 193ba0 003108 04 WAp 0 0 16 [23] .sbss NOBITS 1001f718 196ca8 000000 00 WAp 0 0 1 [24] .bss NOBITS 1001f720 196cb0 001740 00 WA 0 0 16 [25] .comment PROGBITS 00000000 196cb0 00068a 00 0 0 1 [26] .pdr PROGBITS 00000000 19733c 01d380 00 0 0 4 [27] .note NOTE 00000000 1b46bc 00003c 00 0 0 1 [28] .rel.dyn REL 00422fe8 022fe8 000428 08 A 6 0 4 [29] .mdebug.abi32 PROGBITS 00000000 1b46f8 000000 00 0 0 1 [30] .shstrtab STRTAB 00000000 1b46f8 000106 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) Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align PHDR 0x000034 0x00400034 0x00400034 0x00100 0x00100 R E 0x4 INTERP 0x000134 0x00400134 0x00400134 0x0000d 0x0000d R 0x1 [Requesting program interpreter: /lib/ld.so.1] REGINFO 0x000170 0x00400170 0x00400170 0x00018 0x00018 R 0x4 LOAD 0x000000 0x00400000 0x00400000 0x177584 0x177584 R E 0x10 LOAD 0x177590 0x10000000 0x10000000 0x1f718 0x20e60 RW 0x10 DYNAMIC 0x000188 0x00400188 0x00400188 0x2152f 0x2152f RWE 0x4 NOTE 0x000150 0x00400150 0x00400150 0x00020 0x00020 R 0x10 GNU_EH_FRAME 0x1748c0 0x005748c0 0x005748c0 0x02cc4 0x02cc4 R 0x4 Section to Segment mapping: Segment Sections... 00 01 .interp 02 .reginfo 03 .interp .note.ABI-tag .reginfo .dynamic .hash .dynsym .dynstr .gnu.version .gnu.version_r .init .text .fini .rodata .eh_frame_hdr .rel.dyn 04 .data .rld_map .eh_frame .gcc_except_table .ctors .dtors .jcr .got .bss 05 .dynamic .hash .dynsym .dynstr 06 .note.ABI-tag 07 .eh_frame_hdr
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