From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp38.i.mail.ru (smtp38.i.mail.ru [94.100.177.98]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 7DED02C0094 for ; Fri, 22 Feb 2013 07:45:06 +1100 (EST) Message-ID: <5126955B.9070808@mail.ru> Date: Thu, 21 Feb 2013 22:44:59 +0100 From: Phileas Fogg MIME-Version: 1.0 To: Benjamin Herrenschmidt Subject: Re: PS3: Strange issue with kexec and FreeBSD loader References: <1360365046.495584377@f356.mail.ru> <5123C729.5040607@mail.ru> <5123D864.4060503@mail.ru> <51253558.1070407@mail.ru> <1361406741.4676.44.camel@pasglop> <512685B7.5080404@mail.ru> <1361478942.4676.53.camel@pasglop> In-Reply-To: <1361478942.4676.53.camel@pasglop> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-dev List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Benjamin Herrenschmidt wrote: > On Thu, 2013-02-21 at 21:38 +0100, Phileas Fogg wrote: >> The new 8 bytes at offset 0x90 in dt.dump.hex look suspicously like >> the kernel virtual address: 0xc00000000001a4a0. > > It does indeed. What does that address correspond to in the kernel > text ? Can you disassemble around it with "objdump -D vmlinux" ? > > Cheers, > Ben. > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev > Here. I used OpenWRT ELF for testing and it's stripped. Then i compiled Linux 3.8 myself and didn't strip it. Addresses are different in both cases but the code is the same and it is kexec code :) Stripped OpenWRT image: ------------------------ c00000000001a474: 48 00 00 05 bl 0xc00000000001a478 c00000000001a478: 7c a8 02 a6 mflr r5 c00000000001a47c: 38 a5 00 1c addi r5,r5,28 c00000000001a480: 7c 21 0b 78 mr r1,r1 c00000000001a484: 80 85 00 00 lwz r4,0(r5) c00000000001a488: 2c 04 00 00 cmpwi r4,0 c00000000001a48c: 40 82 00 62 bnea- 0x60 c00000000001a490: 4b ff ff f0 b 0xc00000000001a480 c00000000001a494: 00 00 00 00 .long 0x0 c00000000001a498: a0 6d 00 48 lhz r3,72(r13) c00000000001a49c: 48 00 00 11 bl 0xc00000000001a4ac c00000000001a4a0: 38 80 00 02 li r4,2 <-------- !!! c00000000001a4a4: 98 8d 00 4b stb r4,75(r13) c00000000001a4a8: 4b ff ff cc b 0xc00000000001a474 c00000000001a4ac: 39 20 00 02 li r9,2 c00000000001a4b0: 39 40 00 30 li r10,48 c00000000001a4b4: 7d 68 02 a6 mflr r11 c00000000001a4b8: 7d 80 00 a6 mfmsr r12 c00000000001a4bc: 7d 89 48 78 andc r9,r12,r9 c00000000001a4c0: 7d 8a 50 78 andc r10,r12,r10 c00000000001a4c4: 7d 21 01 64 mtmsrd r9,1 Unstripped Linux 3.8 kernel: ----------------------------- c00000000001c02c <.kexec_wait>: c00000000001c02c: 48 00 00 05 bl c00000000001c030 <.kexec_wait+0x4> c00000000001c030: 7c a8 02 a6 mflr r5 c00000000001c034: 38 a5 00 1c addi r5,r5,28 c00000000001c038: 7c 21 0b 78 mr r1,r1 c00000000001c03c: 80 85 00 00 lwz r4,0(r5) c00000000001c040: 2c 04 00 00 cmpwi r4,0 c00000000001c044: 40 82 00 62 bnea- 60 c00000000001c048: 4b ff ff f0 b c00000000001c038 <.kexec_wait+0xc> c00000000001c04c : c00000000001c04c: 00 00 00 00 .long 0x0 c00000000001c050 <.kexec_smp_wait>: c00000000001c050: a0 6d 00 48 lhz r3,72(r13) c00000000001c054: 48 00 00 11 bl c00000000001c064 c00000000001c058: 38 80 00 02 li r4,2 <---------- !!! c00000000001c05c: 98 8d 00 4b stb r4,75(r13) c00000000001c060: 4b ff ff cc b c00000000001c02c <.kexec_wait> c00000000001c064 : c00000000001c064: 39 20 00 02 li r9,2 c00000000001c068: 39 40 00 30 li r10,48 regards