1463 2011-09-08 08:54:52 +0000 MIPS prelinking with latest compiler produces warnings/errors 2012-01-25 08:24:28 +0000 1 1 6 Yocto Project Subprojects Cross-prelink cross-prelink unspecified x86 mips RESOLVED FIXED Medium normal 1.2 1 mark.hatle mark.hatle raj.khem sgw yp.cp.watcher yp.watcher --- --- --- oldest_to_newest 16101 0 mark.hatle 2011-09-08 08:54:52 +0000 When prelinking against executables produce with the latest compilers, a number of warnings/errors are produced that indicate that section ordering does not match the prelinker's expectations. The error message is: NOBITS section followed by non-NOBITS section in the same segment In order to reproduce the issue. Use oe-core or Yocto Project to build a mips target image with the prelinker enabled. Look at the temp/log.do_rootfs file for the error messages. The error is traced down to the code: exec.c: for (j = 1; j < dso->ehdr.e_shnum; ++j) if (dso->shdr[j].sh_addr >= dso->phdr[i].p_vaddr && dso->shdr[j].sh_addr + dso->shdr[j].sh_size <= dso->phdr[i].p_vaddr + dso->phdr[i].p_memsz) { if (dso->shdr[j].sh_type != SHT_NOBITS || (dso->shdr[j].sh_flags & SHF_TLS)) { if (sfirst) { error (0, 0, "%s: NOBITS section followed by non-NOBITS section in the same segment", dso->filename); goto error_out; } continue; } if (!sfirst) sfirst = j; if (strcmp (strptr (dso, dso->ehdr.e_shstrndx, dso->shdr[j].sh_name), ".plt") == 0) slast = j + 1; else if (j == new_dynbss || j == new_sdynbss) slast = j; } It loops over the sections, and if there is a PROGBITS and other sections after non-NOBITS it throws an error. All of the executables being produced by the latest toolchains look like: 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 00400144 000144 000020 00 A 0 0 4 [ 3] .dynamic DYNAMIC 00400164 000164 0000d8 08 A 6 0 4 [ 4] .hash HASH 0040023c 00023c 000f94 04 A 5 0 4 [ 5] .dynsym DYNSYM 004011d0 0011d0 001540 10 A 6 1 4 [ 6] .dynstr STRTAB 00402710 002710 000b75 00 A 0 0 1 [ 7] .gnu.version VERSYM 00403286 003286 0002a8 02 A 5 0 2 [ 8] .gnu.version_r VERNEED 00403530 003530 000080 00 A 6 1 4 [ 9] .init PROGBITS 004035b0 0035b0 000078 00 AX 0 0 4 [10] .text PROGBITS 00403630 003630 090450 00 AX 0 0 16 [11] .MIPS.stubs PROGBITS 00493a80 093a80 001280 00 AX 0 0 4 [12] .fini PROGBITS 00494d00 094d00 000044 00 AX 0 0 4 [13] .rodata PROGBITS 00494d50 094d50 010631 00 A 0 0 16 [14] .eh_frame_hdr PROGBITS 004a5384 0a5384 00002c 00 A 0 0 4 [15] .eh_frame PROGBITS 004a53b0 0a53b0 000068 00 A 0 0 4 [16] .ctors PROGBITS 004b5418 0a5418 000008 00 WA 0 0 4 [17] .dtors PROGBITS 004b5420 0a5420 000008 00 WA 0 0 4 [18] .jcr PROGBITS 004b5428 0a5428 000004 00 WA 0 0 4 [19] .data.rel.ro PROGBITS 004b542c 0a542c 000c48 00 WA 0 0 4 [20] .data PROGBITS 004b6074 0a6074 00013a 00 WA 0 0 4 [21] .rld_map PROGBITS 004b61b0 0a61b0 000004 00 WA 0 0 4 [22] .got PROGBITS 004b61c0 0a61c0 000568 04 WAp 0 0 16 [23] .sdata PROGBITS 004b6728 0a6728 000004 00 WAp 0 0 4 [24] .sbss NOBITS 004b672c 0a672c 00003d 00 WAp 0 0 4 [25] .bss NOBITS 004b6770 0a672c 0021cc 00 WA 0 0 16 [26] .gnu.attributes LOOS+ffffff5 00000000 0a672c 000010 00 0 0 1 [27] .mdebug.abi32 PROGBITS 004b893c 0a673c 000000 00 0 0 1 [28] .gnu_debuglink PROGBITS 00000000 0a673c 00000c 00 0 0 1 [29] .shstrtab STRTAB 00000000 0a6748 00010d 00 0 0 1 17932 1 mark.hatle 2012-01-03 10:34:24 +0000 This is still an ongoing issue. I believe the generated code from the linker is correct, but I'm not sure yet how to either change the linker ordering or update the prelinker to support this unique ordering. 17974 2 mark.hatle 2012-01-05 11:40:47 +0000 A possible fix for this issue has been sent to the oe-core mailing. 18140 3 mark.hatle 2012-01-13 09:42:23 +0000 Fix has been pushed to the cross-prelink repository. An update to the prelink recipe is pending. cross-prelink commit id: 7b47f2f8a15ed13b7905bc120bb2586f3e164f7d 18347 4 mark.hatle 2012-01-25 08:24:28 +0000 Fixed - oe-core commit: 09a70c55e590d169b8a3b4b89853c96b7b977fc0