From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org, Joel Stanley <joel@jms.id.au>
Subject: Re: [PATCH] powerpc: vmlinux.lds: Drop Binutils 2.18 workarounds
Date: Wed, 27 Mar 2019 10:09:56 +0100 [thread overview]
Message-ID: <5f059a1e-63f8-703f-fd0b-dceb0bb8f9a0@c-s.fr> (raw)
In-Reply-To: <a8fcafac-415d-7537-4f3d-008279824fef@c-s.fr>
Le 27/03/2019 à 09:56, Christophe Leroy a écrit :
>
>
> Le 26/03/2019 à 21:12, Segher Boessenkool a écrit :
>> On Tue, Mar 26, 2019 at 08:28:58PM +0100, Christophe Leroy wrote:
>>>
>>>
>>> Le 26/03/2019 à 19:19, Segher Boessenkool a écrit :
>>>> On Tue, Mar 26, 2019 at 07:55:33AM +0000, Christophe Leroy wrote:
>>>>> STACK off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align
>>>>> 2**4
>>>>> filesz 0x00000000 memsz 0x00000000 flags rwx
>>>>
>>>> You need to prevent this one somehow. What object file forces this?
>>>
>>> mpc885_ads_defconfig
>>
>> No, which object file, ".o file". Not defconfig :-)
>>
>
> Ok, how to I know that ? Is it based on some file flags or some headers ?
>
> Here is the list of headers in vmlinux.o, is there one that shouldn't
> exist ?
>
>
> vmlinux.o: file format elf32-powerpc
>
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .text 003320c0 00000000 00000000 00001000 2**12
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 1 .head.text 00002340 00000000 00000000 003330c0 2**0
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 2 .init.text 00017cb8 00000000 00000000 00335400 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 3 .text.unlikely 00004154 00000000 00000000 0034d0b8 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 4 .ref.text 000013f0 00000000 00000000 0035120c 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 5 .softirqentry.text 00000258 00000000 00000000 003525fc 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 6 .sched.text 00003930 00000000 00000000 00352854 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 7 .cpuidle.text 0000007c 00000000 00000000 00356184 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 8 .meminit.text 00000584 00000000 00000000 00356200 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 9 .exit.text 00000800 00000000 00000000 00356784 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 10 .rodata 0001d7a7 00000000 00000000 00356f90 2**4
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 11 .init.rodata 00000790 00000000 00000000 00374738 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 12 .rodata.str1.4 00022329 00000000 00000000 00374ec8 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 13 __param 000003c0 00000000 00000000 003971f4 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 14 .note.Linux 00000018 00000000 00000000 003975b4 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 15 __ex_table 00000ca8 00000000 00000000 003975cc 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 16 __ftr_alt_97 00000008 00000000 00000000 00398274 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 17 __ftr_fixup 00000198 00000000 00000000 00398280 2**3
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 18 __reservedmem_of_table 000000c4 00000000 00000000 00398418 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 19 __irqchip_of_table_end 000000c4 00000000 00000000 003984dc 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 20 __modver 00000008 00000000 00000000 003985a0 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 21 __reservedmem_of_table_end 000000c4 00000000 00000000 003985a8
> 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 22 .eh_frame 00134eb8 00000000 00000000 0039866c 2**2
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> 23 .fixup 00000cc8 00000000 00000000 004cd524 2**0
> CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> 24 .data 00013668 00000000 00000000 004cf000 2**12
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 25 __bug_table 00006ce4 00000000 00000000 004e2668 2**0
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 26 .data..read_mostly 00001ce8 00000000 00000000 004e9350 2**3
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 27 .init.data 0000244c 00000000 00000000 004eb038 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 28 .init.setup 0000039c 00000000 00000000 004ed484 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 29 .initcallrootfs.init 00000004 00000000 00000000 004ed820 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 30 .data..page_aligned 00003000 00000000 00000000 004ee000 2**12
> CONTENTS, ALLOC, LOAD, DATA
> 31 .initcall3.init 00000008 00000000 00000000 004f1000 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 32 .initcallearly.init 00000010 00000000 00000000 004f1008 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 33 .initcall6.init 00000120 00000000 00000000 004f1018 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 34 .initcall4.init 00000080 00000000 00000000 004f1138 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 35 .data.once 0000009e 00000000 00000000 004f11b8 2**0
> CONTENTS, ALLOC, LOAD, DATA
> 36 .initcall1.init 00000048 00000000 00000000 004f1258 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 37 .initcall7.init 00000030 00000000 00000000 004f12a0 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 38 .machine.desc 000000e0 00000000 00000000 004f12d0 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 39 .data..cacheline_aligned 00005000 00000000 00000000 004f13b0 2**4
> CONTENTS, ALLOC, LOAD, DATA
> 40 .data..ro_after_init 000004b8 00000000 00000000 004f63b0 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 41 .initcall2.init 00000018 00000000 00000000 004f6868 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 42 .initcall5.init 00000070 00000000 00000000 004f6880 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 43 .meminit.data 00000010 00000000 00000000 004f68f0 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 44 .ref.data 00000578 00000000 00000000 004f6900 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 45 .exitcall.exit 000000b0 00000000 00000000 004f6e78 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 46 .initcall0.init 0000000c 00000000 00000000 004f6f28 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 47 .con_initcall.init 00000004 00000000 00000000 004f6f34 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 48 .initcall7s.init 00000004 00000000 00000000 004f6f38 2**2
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 49 .data..shared_aligned 00000118 00000000 00000000 004f6f40 2**4
> CONTENTS, ALLOC, LOAD, DATA
> 50 .sdata 00000188 00000000 00000000 004f7058 2**3
> CONTENTS, ALLOC, LOAD, RELOC, DATA
> 51 .sbss 000002d4 00000000 00000000 004f71e0 2**3
> ALLOC
> 52 .bss 0001e728 00000000 00000000 004f71e0 2**4
> ALLOC
> 53 .stab 00000270 00000000 00000000 004f71e0 2**2
> CONTENTS, RELOC, READONLY, DEBUGGING
> 54 .stabstr 00000335 00000000 00000000 004f7450 2**0
> CONTENTS, READONLY, DEBUGGING
> 55 .comment 0000339c 00000000 00000000 004f7785 2**0
> CONTENTS, READONLY
> 56 .note.GNU-stack 00000000 00000000 00000000 004fab21 2**0
> CONTENTS, READONLY, CODE
> 57 .debug_aranges 000077e8 00000000 00000000 004fab28 2**3
> CONTENTS, RELOC, READONLY, DEBUGGING
> 58 .debug_info 030a43d8 00000000 00000000 00502310 2**0
> CONTENTS, RELOC, READONLY, DEBUGGING
> 59 .debug_abbrev 0018bdc0 00000000 00000000 035a66e8 2**0
> CONTENTS, READONLY, DEBUGGING
> 60 .debug_line 005d69b9 00000000 00000000 037324a8 2**0
> CONTENTS, RELOC, READONLY, DEBUGGING
> 61 .debug_frame 00134eb8 00000000 00000000 03d08e64 2**2
> CONTENTS, RELOC, READONLY, DEBUGGING
> 62 .debug_str 01b24fc1 00000000 00000000 03e3dd1c 2**0
> CONTENTS, READONLY, DEBUGGING
> 63 .debug_loc 00242597 00000000 00000000 05962cdd 2**0
> CONTENTS, RELOC, READONLY, DEBUGGING
> 64 .debug_ranges 001ea010 00000000 00000000 05ba5274 2**0
> CONTENTS, RELOC, READONLY, DEBUGGING
> 65 .gnu.attributes 00000012 00000000 00000000 05d8f284 2**0
> CONTENTS, READONLY
>
Using readelf, I get the following output
[root@localhost linux-powerpc]# powerpc64-linux-readelf -l vmlinux
Elf file type is EXEC (Executable file)
Entry point 0xc0000000
There are 3 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x010000 0xc0000000 0x00000000 0x3f8ce4 0x417a08 RWE
0x10000
NOTE 0x3c3ca8 0xc03b3ca8 0x003b3ca8 0x0003c 0x0003c R 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x10
Section to Segment mapping:
Segment Sections...
00 .head.text .text .rodata __param __modver __ex_table .notes
.init.text .exit.text .init.data .init.setup .initcall.init
.con_initcall.init __ftr_fixup .machine.desc .data .data..init_task
.data..page_aligned .data..cacheline_aligned .data..read_mostly
__bug_table .sbss .bss
01 .notes
02
Is it the section .note.GNU-stack which implies GNU_STACK program header
? That section seems to be present in most .o files.
Christophe
next prev parent reply other threads:[~2019-03-27 9:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 0:32 [PATCH] powerpc: vmlinux.lds: Drop Binutils 2.18 workarounds Joel Stanley
2019-03-21 23:34 ` Segher Boessenkool
2019-03-22 0:22 ` Michael Ellerman
2019-03-26 0:55 ` Michael Ellerman
2019-03-26 7:55 ` Christophe Leroy
2019-03-26 18:19 ` Segher Boessenkool
2019-03-26 19:28 ` Christophe Leroy
2019-03-26 20:12 ` Segher Boessenkool
2019-03-26 22:29 ` Segher Boessenkool
2019-03-26 22:59 ` Segher Boessenkool
2019-03-27 6:40 ` Christophe Leroy
2019-03-27 12:47 ` Segher Boessenkool
2019-03-27 18:21 ` Segher Boessenkool
2019-03-28 6:19 ` Christophe Leroy
2019-03-28 15:11 ` Segher Boessenkool
2019-03-27 8:56 ` Christophe Leroy
2019-03-27 9:09 ` Christophe Leroy [this message]
2019-03-26 8:08 ` Christophe Leroy
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