Date: Thu, 18 Feb 1999 18:15:20 +0100 From: Marcel Moolenaar <marcel@scc.nl> To: emulation@FreeBSD.ORG Subject: Re: ELF/VM problem [was: Re: linux ELF emulation is kinda broken (fwd)] Message-ID: <36CC4AA8.F7488014@scc.nl> References: <Pine.BSF.3.95.990216120935.13983G-100000@current1.whistle.com>, <36CB33C1.F5A4D530@scc.nl>
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Marcel Moolenaar wrote:
>
> Marcel Moolenaar wrote:
> > I did some kernel debugging and found out that there is something funny going
> > on when ld-linux.so.1 is about to get loaded. Function elf_load_section() in
> > file /sys/kern/imgact_elf.c fails to load the first program header. More
> > specifically, The very first vm_map_insert() in that function fails with
> > error 22 (EINVAL).
>
> Correction:
> vm_map_insert() fails with error code 3 (KERN_NO_SPACE).
> elf_load_section() fails with error code 22 (EINVAL).
It seems that the interpreter is loaded at address 0x08000000. The VM map
already has an entry with start address 0x08000000 (see objdump). As a result
vm_map_insert() returns KERN_NO_SPACE. Recent changes in the ELF image code
hardwired the loading of the interpreter to that address (for i386 that is).
objdump:
lmgrd: file format elf32-i386
lmgrd
architecture: i386, flags 0x00000112:
EXEC_P, HAS_SYMS, D_PAGED
start address 0x08001ac0
Program Header:
PHDR off 0x00000034 vaddr 0x08000034 paddr 0x00000000 align 2**2
filesz 0x000000a0 memsz 0x000000a0 flags r-x
INTERP off 0x000000d4 vaddr 0x080000d4 paddr 0x00000000 align 2**0
filesz 0x00000013 memsz 0x00000013 flags r--
LOAD off 0x00000000 vaddr 0x08000000 paddr 0x00000000 align 2**12
filesz 0x000343c2 memsz 0x000343c2 flags r-x
LOAD off 0x000343c8 vaddr 0x080353c8 paddr 0x00000000 align 2**12
filesz 0x00000f8c memsz 0x000080b8 flags rw-
DYNAMIC off 0x000352c4 vaddr 0x080362c4 paddr 0x00000000 align 2**2
filesz 0x00000090 memsz 0x00000090 flags rw-
marcel
cc: jdp@freebsd.org
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