| Summary: | Segmentation Fault using cross architecture ld command | ||
|---|---|---|---|
| Product: | binutils | Reporter: | John Morrison <jmorrison> |
| Component: | ld | Assignee: | unassigned |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | CC: | bug-binutils |
| Priority: | P2 | ||
| Version: | 2.18 | ||
| Target Milestone: | --- | ||
| Host: | i686-pc-linux-gnu | Target: | powerpc-unknown-eabi |
| Build: | i686-pc-linux-gnu | Last reconfirmed: | |
| Attachments: |
This is trace information from GDB.
Full execution console listing while under GDB. The file created with the -M flag |
||
|
Description
John Morrison
2008-08-14 22:31:47 UTC
Created attachment 2905 [details]
This is trace information from GDB.
Let me know if you want more information and how to get it for you.
Created attachment 2906 [details]
Full execution console listing while under GDB.
Created attachment 2907 [details]
The file created with the -M flag
Just in case you may have wanted it.
I have not been really able to cut the execution down to a reasonale test size. I wish I could. The GDB Console Listing attachment shows the parameters on the command call. Does your project link if you omit --gc-sections from the ld options? Subject: Re: New: Segmentation Fault using cross architecture
ld command
Hi John,
> We are upgrading our cross-compiler from GCC 2.95.2, binutils 2.10.1 to GCC
> 4.2.0, binutils 2.17.
Is there any particular reason that you are not using the 2.18 binutils
release or the mainline development sources ?
Cheers
Nick
Reply to #6 from Alan: Without the --gc-section option I get this error message: no memory region specified for loadable section `.eh_frame' You can see our linker script in one of the console listings. That has been used for years. It wasn't until this migration/upgrade project, did we run into the above error and one other about .rela.dyn. One of my many tests was to use the built in linker script which I adjusted slightly to our needs. I can attach that if you wish. It got the seg fault also, and if I remember correctly, I did not use the --gc-sections option with that script. Reply to #7 from Nick. That was a finger-check on my part. We started this journey with 2.17, but once we ran across the seg-fault, we went to 2.18 and I've been continuously checking with the latest snapshots. Sorry about that. Hi John, Hmm, without a test case this is going to be very hard to track down and fix. But if you are willing to try a few things then maybe we can solve it. 1. Re comment #8. If you add an entry for .eh_frame to your linker script and try again does that work ? (And if necessary, adding entries for any other loadable input sections which are not currently mentioned in the linker script). 2. It appears that code in elf32-ppc.c that is causing the problem is trying to set an entry in the global offset table. When the seg-fault occurs, can you use gdb to find out the values (in hex) of: htab->got->contents htab->elf.hgot->root.u.def.value htab->got->size Cheers Nick Reply to #10: Item 1. I'll play around so more with the linker script. Item 2. Here is the information you asked for (i hope): I've edited out my mistakes... For brevity I change "/home/morr_jo/work/ToolChain/cross" to "***" At point of fault, htab is 0x00. Going UP the call chain to the caller, I got the values below. I stopped there. Program received signal SIGSEGV, Segmentation fault. 0x0806fe40 in bfd_putb32 (data=1317011489, p=0xb66f694) at ***/src/binutils-2.18.50/bfd/libbfd.c:742 742 addr[0] = (data >> 24) & 0xff; (gdb) bt #0 0x0806fe40 in bfd_putb32 (data=1317011489, p=0xb66f694) at ***/src/binutils-2.18.50/bfd/libbfd.c:742 #1 0x08085cce in ppc_elf_finish_dynamic_sections (output_bfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elf32-ppc.c:7739 #2 0x080a28f1 in bfd_elf_final_link (abfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elflink.c:10801 #3 0x0805ba4d in ldwrite () at ***/src/binutils-2.18.50/ld/ldwrite.c:567 #4 0x08059843 in main (argc=50, argv=0xbff83044) at ***/src/binutils-2.18.50/ld/ldmain.c:462 (gdb) print htab $1 = 0 (gdb) print htab->got->contents Attempt to extract a component of a value that is not a structure pointer. (gdb) up #1 0x08085cce in ppc_elf_finish_dynamic_sections (output_bfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elf32-ppc.c:7739 7739 bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, p - 4); (gdb) print htab $2 = (struct ppc_elf_link_hash_table *) 0x8931df0 (gdb) print htab->got $3 = (asection *) 0x893a7e4 (gdb) x/50x htab->got 0x893a7e4: 0x08103048 0x00000018 0x00000008 0x0893a88c 0x893a7f4: 0x0893a73c 0x00104113 0x00000102 0x00000000 0x893a804: 0x00000000 0x00000010 0x00000000 0x000cb0b0 0x893a814: 0x08931730 0x00000002 0x00000000 0x00000000 0x893a824: 0x00000000 0x00000000 0x00000000 0x00000000 0x893a834: 0x00000000 0x00000000 0x00000000 0x00000000 0x893a844: 0x0aaba718 0x00000000 0x00000000 0x00000000 0x893a854: 0x00000000 0x00000000 0x00000000 0x00000000 0x893a864: 0x08939148 0x00000000 0x089380a0 0x089391f4 0x893a874: 0x0893a870 0x08943644 0x09ec8d5c 0x00000000 0x893a884: 0x08103043 0x056935ec 0x08103043 0x00000019 0x893a894: 0x00000009 0x0893a934 0x0893a7e4 0x0010c10b 0x893a8a4: 0x00000100 0x00000000 (gdb) print htab->got->contents $4 = (unsigned char *) 0xaaba718 "" (gdb) x/50x htab->got->contents 0xaaba718: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba728: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba738: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba748: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba758: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba768: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba778: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba788: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba798: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba7a8: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba7b8: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba7c8: 0x00000000 0x00000000 0x00000000 0x00000000 0xaaba7d8: 0x00000000 0x00000000 (gdb) print/x htab->elf.hgot->root.u.def.value $7 = 0xbb4f80 (gdb) print/x htab->got->size $8 = 0x10 (gdb) up #2 0x080a28f1 in bfd_elf_final_link (abfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elflink.c:10801 10801 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info)) (gdb) x/30x htab->got->contents Attempt to extract a component of a value that is not a structure pointer. (gdb) print/x htab->got->size Attempt to extract a component of a value that is not a structure pointer. (gdb) print/x htab->elf.hgot->root.u.def.value Attempt to extract a component of a value that is not a structure pointer. (gdb) bt #0 0x0806fe40 in bfd_putb32 (data=1317011489, p=0xb66f694) at ***/src/binutils-2.18.50/bfd/libbfd.c:742 #1 0x08085cce in ppc_elf_finish_dynamic_sections (output_bfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elf32-ppc.c:7739 #2 0x080a28f1 in bfd_elf_final_link (abfd=0x892fbe0, info=0x8110e60) at ***/src/binutils-2.18.50/bfd/elflink.c:10801 #3 0x0805ba4d in ldwrite () at ***/src/binutils-2.18.50/ld/ldwrite.c:567 #4 0x08059843 in main (argc=50, argv=0xbff83044) at ***/src/binutils-2.18.50/ld/ldmain.c:462 (gdb) Reply to #10:
Item 1: here is the updated linker script with the .eh_frame "clause" (near the
end). I still get the
no memory region specified for loadable section `.eh_frame'
error message.
STARTUP(vectors.o)
ENTRY(__exception_reset)
INPUT(extras.o)
GROUP(libtarget.a libgcc.a embedded.lib kerberos.lib )
MEMORY
{
ram : ORIGIN = 0, LENGTH = 0x1000000
}
SECTIONS
{
.vectors 0 : { . = . ; KEEP(*(.vectors)) } > ram
__reserved_vsr_table = 0x3000; . = __reserved_vsr_table + 0x200;
.hwinfo 0x3200 : { . = . ; __hwinfo = .; *(.hwinfo) } > ram
.vecipds 0x3FFF : { . = . ; __vecipds = . ; *(.vecipds) ; BYTE(0) } > ram
.sram 0x4000 : { _sram_start = . ; *(SORT(.sram*)) ; _sram_end = . ; } > ram
.text ALIGN (0x4) : { _stext = .; *(.text*) *(.gnu.warning)
*(.gnu.linkonce*) *(.init) } > ram _etext = .; PROVIDE (etext = .);
.fini ALIGN (0x4) : { . = . ; *(.fini) } > ram
.rodata1 ALIGN (0x8) : { . = . ; *(.rodata1*) } > ram
.rodata ALIGN (0x8) : { . = . ; *(.rodata*) } > ram
.fixup ALIGN (0x4) : { __FIXUP_START__ = ABSOLUTE(.); *(.fixup)
__FIXUP_END__ = ABSOLUTE(.);} > ram
.eh_frame : { KEEP (*(.eh_frame)) } > ram
.gcc_except_table ALIGN (0x1) : { __EXCEPT_START__ = ABSOLUTE(.);
*(.gcc_except_table) __EXCEPT_END__ = ABSOLUTE(.);} > ram
.data ALIGN (0x8) : { __ram_data_start = ABSOLUTE(.); *(.data*)
__GOT1_START__ = ABSOLUTE(.); *(.got1) __GOT1_END__ = ABSOLUTE(.); . = ALIGN(8);
__CTOR_LIST__ = ABSOLUTE(.); KEEP(*(SORT(.ctors*))) __CTOR_END__ = ABSOLUTE(.);
__DTOR_LIST__ = ABSOLUTE(.); KEEP(*(SORT(.dtors*))) __DTOR_END__ = ABSOLUTE(.);
. = ALIGN(8); KEEP(*( SORT (.ecos.table.*))) ; . = ALIGN(4); *( .2ram.*) ;
__GOT2_START__ = ABSOLUTE(.); *(.got2) __GOT2_END__ = ABSOLUTE(.); __GOT_START =
ABSOLUTE(.); _GLOBAL_OFFSET_TABLE_ = ABSOLUTE(. + 32768); _SDA_BASE_ =
ABSOLUTE(.); *(.got.plt) *(.got) __GOT_END__ = ABSOLUTE(.); *(.dynamic)
__SDATA_START__ = ABSOLUTE(.); *(.sdata) *(.sdata.*) __SDATA2_START__ =
ABSOLUTE(.); *(.sdata2*) } > ram __rom_data_start = LOADADDR(.data);
__ram_data_end = .; PROVIDE(__ram_data_end = .); _edata = .; PROVIDE (edata = .);
.sbss ALIGN (0x4) : { __sbss_start = ABSOLUTE (.); __SBSS_START__ =
ABSOLUTE(.); *(.sbss.*) __SBSS_END__ = ABSOLUTE(.); __SBSSx_START__ =
ABSOLUTE(.); *(.sbss*) __SBSSx_END__ = ABSOLUTE(.); *(.scommon*) __sbss_end =
ABSOLUTE (.); } > ram
.bss ALIGN (0x10) : { __bss_start = ABSOLUTE (.); . = . ;
*(.dynbss*) *(.bss*) *(COMMON) __bss_end = ABSOLUTE (.); } > ram
.eh_frame : {*(.eh_frame)}
__heap1 = ALIGN (0x8);
. = ALIGN(4); _end = .; PROVIDE (end = .);
}
hal_vsr_table = (0x0 + 0x3000) ;
hal_virtual_vector_table = ((0x0 + 0x3000) + 0x200) ;
You cannot define _GLOBAL_OFFSET_TABLE_ like this in a script. |