Date: Thu, 8 Dec 2016 23:14:52 +0100 From: Roman Divacky <rdivacky@vlakno.cz> To: Mark Millard <markmi@dsl-only.net> Cc: FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, Justin Hibbits <chmeeedalf@gmail.com>, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>, nwhitehorn@freebsd.org Subject: Re: clang 3.9.0 buildkernel on old powerpc64's vs. trying to build hwpmc_e500.o and the like. . . Message-ID: <20161208221452.GA42380@vlakno.cz> In-Reply-To: <E49F7EE4-7A62-4601-98DC-4C4791B7158D@dsl-only.net> References: <300CB7A2-34BB-407F-B2E9-D263B119A989@dsl-only.net> <20161205161904.GA7889@vlakno.cz> <126E2EDE-9499-4103-A3DB-CC517105DAB2@dsl-only.net> <D3DE2D12-9885-4154-B680-6DA5A8B62A56@dsl-only.net> <D9C54972-8D21-4D55-A707-4FFC2BDCD9FE@dsl-only.net> <20161207190057.GA58950@vlakno.cz> <E1376C20-C1BD-418D-81C6-CDDE479342CA@dsl-only.net> <CE88C1F4-B9BD-4D45-8DF0-F1079C3257A5@dsl-only.net> <20161208185541.GA33364@vlakno.cz> <E49F7EE4-7A62-4601-98DC-4C4791B7158D@dsl-only.net>
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I believe the code comes from sys/powerpc/aim/locore64.S and if you compare the different values from the disssembly with the .S code you can see it's __tocbase and TOC_REF(). I wonder if the assembly has the -mminimal-toc knowledge hardcoded in somehow. I am not sure what expectations the locore64.S has about the kernel layout that we're probably breaking. I've CCed Nathan Whitehorn. Nathan, can you take a look please? Thanks, Roman On Thu, Dec 08, 2016 at 02:03:58PM -0800, Mark Millard wrote: > [I have dropped the patch related information and just have > failing-boot related information here.] > > On 2016-Dec-8, at 10:55 AM, Roman Divacky <rdivacky at vlakno.cz> wrote: > > > Can you try to investigate why it dies? I am not convinced -mminimal-toc > > would result in a boot failure. I think the kernel would fail to link. > > I give information for both devel/powerpc64-binutils based > and for WITH_BINUTILS_BOOTSTRAP= based. They are different. > > For using 2.25.1 of devel/powerpc64-binutils (a cross build): > (from camera image of screen) > > . . . (omitted material) . . . > Type '?' for a list of commands, 'help' for more detailed help. > OK unload > OK boot ker390 > /boot/ker390/kernel data=0xf851a8+0x42dd98 syms=[0x8+0xd6848+0x8+0xf1137] > /boot/entropy size=0x1000 > Booting. . . > Kernel entry at 0x100160 > > Invalid memory access at %SSR0: 00000000.001001b0 %SRR1:90000000.00003030 > > Apple PowerMac11,2 5.2.7f1 BootROM builtin on 09/30/005 at 15:31:03 > . . . (omitted material) . . . > ok > 0 > > > The only options at this point are: > > mac-boot > shut-down > > > From objdump for the above failing boot > but with notes added: > (Note: booting xtoolchain kernel starts at > 0000000000100120 instead; relative > offsets are unchanged and the code > is mostly the same.) > > Disassembly of section .text: > 0000000000100160 <.__start> mfmsr r20 > 0000000000100164 <.__start+0x4> li r21,1 > 0000000000100168 <.__start+0x8> rldimi r20,r21,63,0 > 000000000010016c <.__start+0xc> mtmsrd r20 > 0000000000100170 <.__start+0x10> isync > 0000000000100174 <.__start+0x14> nop > 0000000000100178 <.__start+0x18> b 0000000000100180 <.__start+0x20> > 000000000010017c <.__start+0x1c> nop > 0000000000100180 <.__start+0x20> nop > 0000000000100184 <.__start+0x24> bl 0000000000100190 <.__start+0x30> > 0000000000100188 <.__start+0x28> .long 0x0 > 000000000010018c <.__start+0x2c> .long 0xf8ce78 > booting xtoolchain based kernel has: 0xfebeb8 above <<<=== note > 0000000000100190 <.__start+0x30> mflr r2 > 0000000000100194 <.__start+0x34> ld r1,0(r2) > 0000000000100198 <.__start+0x38> add r2,r1,r2 > 000000000010019c <.__start+0x3c> ld r31,-32768(r2) > 00000000001001a0 <.__start+0x40> subf r31,r31,r2 > 00000000001001a4 <.__start+0x44> ld r1,0(r2) <<<=== !!!!! > booting xtoolchain based kernel has: r1,-32760(r2) above <<<=== !!!!! > 00000000001001a8 <.__start+0x48> addi r1,r1,16288 > 00000000001001ac <.__start+0x4c> add r1,r1,r31 > 00000000001001b0 <.__start+0x50> std r3,48(r1) > SRR0 points at the above instruction > (I stopped comparing to the booting xtoolchain > based code after this.) > 00000000001001b4 <.__start+0x54> std r4,56(r1) > 00000000001001b8 <.__start+0x58> std r5,64(r1) > 00000000001001bc <.__start+0x5c> std r6,72(r1) > 00000000001001c0 <.__start+0x60> bl 00000000001001cc <.__start+0x6c> > 00000000001001c4 <.__start+0x64> .long 0x0 > 00000000001001c8 <.__start+0x68> .long 0xf84ed4 > 00000000001001cc <.__start+0x6c> mflr r3 > 00000000001001d0 <.__start+0x70> ld r4,0(r3) > 00000000001001d4 <.__start+0x74> add r3,r4,r3 > 00000000001001d8 <.__start+0x78> mr r4,r31 > 00000000001001dc <.__start+0x7c> bl 0000000000b18ebc <.elf_reloc_self> > 00000000001001e0 <.__start+0x80> nop > 00000000001001e4 <.__start+0x84> ld r3,48(r1) > 00000000001001e8 <.__start+0x88> ld r4,56(r1) > 00000000001001ec <.__start+0x8c> ld r5,64(r1) > 00000000001001f0 <.__start+0x90> ld r6,72(r1) > 00000000001001f4 <.__start+0x94> mr r4,r2 > 00000000001001f8 <.__start+0x98> bl 0000000000b1e980 <.powerpc_init> > 00000000001001fc <.__start+0x9c> nop > 0000000000100200 <.__start+0xa0> mr r1,r3 > 0000000000100204 <.__start+0xa4> li r3,0 > 0000000000100208 <.__start+0xa8> std r3,0(r1) > 000000000010020c <.__start+0xac> bl 00000000005c4af8 <.mi_startup> > 0000000000100210 <.__start+0xb0> nop > 0000000000100214 <.__start+0xb4> b 0000000000100214 <.__start+0xb4> > > > > For using WITH_BINUTILS_BOOTSTRAP= based binutils (a cross build): > (completes for buildkernel; fails for buildworld) > > . . . (omitted material) . . . > Type '?' for a list of commands, 'help' for more detailed help. > OK unload > OK boot ker39a > /boot/ker39a/kernel data=0xfd6318+0x42dda8 syms=[0x8+0xd6860+0x8+0xf1193] > /boot/entropy size=0x1000 > Booting. . . > Kernel entry at 0x100160 > > Invalid memory access at %SSR0: 00000000.00000000 %SRR1:10000000.00081000 > > Apple PowerMac11,2 5.2.7f1 BootROM builtin on 09/30/005 at 15:31:03 > . . . (omitted material) . . . > ok > 0 > > > The only options at this point are: > > mac-boot > shut-down > > The problem here is a different code order and a matching > wrong start address that does not track the difference. > (From objdump.) Note: the same 0(r2) vs. -32760(r2) oddity > exists in the start routine as well. > > Disassembly of section .text: > 0000000000100160 <.__start-0x2030> std r2,40(r1) > 0000000000100164 <.__start-0x202c> addis r2,r2,1 > 0000000000100168 <.__start-0x2028> addi r2,r2,-8 > 000000000010016c <.__start-0x2024> b 0000000000b2c8e0 <.cpu_switch> > 0000000000100170 <.__start-0x2020> std r2,40(r1) > 0000000000100174 <.__start-0x201c> addis r2,r2,1 > 0000000000100178 <.__start-0x2018> addi r2,r2,-8 > 000000000010017c <.__start-0x2014> b 0000000000ade6c8 <.sf_buf_alloc> > 0000000000100180 <.__start-0x2010> std r2,40(r1) > 0000000000100184 <.__start-0x200c> addis r2,r2,1 > 0000000000100188 <.__start-0x2008> addi r2,r2,-8 > 000000000010018c <.__start-0x2004> b 0000000000a83f78 <.vm_fault_hold> > 0000000000100190 <.__start-0x2000> std r2,40(r1) > 0000000000100194 <.__start-0x1ffc> addis r2,r2,1 > 0000000000100198 <.__start-0x1ff8> addi r2,r2,-8 > 000000000010019c <.__start-0x1ff4> b 0000000000b1f1e8 <.fill_regs32> > 00000000001001a0 <.__start-0x1ff0> std r2,40(r1) > 00000000001001a4 <.__start-0x1fec> addis r2,r2,1 > 00000000001001a8 <.__start-0x1fe8> addi r2,r2,-8 > 00000000001001ac <.__start-0x1fe4> b 0000000000b1a7e4 <.casueword32> > 00000000001001b0 <.__start-0x1fe0> std r2,40(r1) > 00000000001001b4 <.__start-0x1fdc> addis r2,r2,1 > 00000000001001b8 <.__start-0x1fd8> addi r2,r2,-8 > 00000000001001bc <.__start-0x1fd4> b 0000000000a8fa30 <.kmap_free_wakeup> > . . . > 0000000000102190 <.__start> mfmsr r20 > 0000000000102194 <.__start+0x4> li r21,1 > 0000000000102198 <.__start+0x8> rldimi r20,r21,63,0 > 000000000010219c <.__start+0xc> mtmsrd r20 > 00000000001021a0 <.__start+0x10> isync > 00000000001021a4 <.__start+0x14> nop > 00000000001021a8 <.__start+0x18> b 00000000001021b0 <.__start+0x20> > 00000000001021ac <.__start+0x1c> nop > 00000000001021b0 <.__start+0x20> nop > 00000000001021b4 <.__start+0x24> bl 00000000001021c0 <.__start+0x30> > 00000000001021b8 <.__start+0x28> .long 0x0 > 00000000001021bc <.__start+0x2c> .long 0xfc8e48 > 00000000001021c0 <.__start+0x30> mflr r2 > 00000000001021c4 <.__start+0x34> ld r1,0(r2) > 00000000001021c8 <.__start+0x38> add r2,r1,r2 > 00000000001021cc <.__start+0x3c> ld r31,-32768(r2) > 00000000001021d0 <.__start+0x40> subf r31,r31,r2 > 00000000001021d4 <.__start+0x44> ld r1,0(r2) <<< same 0 vs. -32760 oddity!!! > 00000000001021d8 <.__start+0x48> addi r1,r1,16288 > 00000000001021dc <.__start+0x4c> add r1,r1,r31 > 00000000001021e0 <.__start+0x50> std r3,48(r1) > 00000000001021e4 <.__start+0x54> std r4,56(r1) > 00000000001021e8 <.__start+0x58> std r5,64(r1) > 00000000001021ec <.__start+0x5c> std r6,72(r1) > 00000000001021f0 <.__start+0x60> bl 00000000001021fc <.__start+0x6c> > 00000000001021f4 <.__start+0x64> .long 0x0 > 00000000001021f8 <.__start+0x68> .long 0xfd4014 > 00000000001021fc <.__start+0x6c> mflr r3 > 0000000000102200 <.__start+0x70> ld r4,0(r3) > 0000000000102204 <.__start+0x74> add r3,r4,r3 > 0000000000102208 <.__start+0x78> mr r4,r31 > 000000000010220c <.__start+0x7c> bl 0000000000101a20 <begin+0x1a20> > 0000000000102210 <.__start+0x80> ld r2,40(r1) > 0000000000102214 <.__start+0x84> ld r3,48(r1) > 0000000000102218 <.__start+0x88> ld r4,56(r1) > 000000000010221c <.__start+0x8c> ld r5,64(r1) > 0000000000102220 <.__start+0x90> ld r6,72(r1) > 0000000000102224 <.__start+0x94> mr r4,r2 > 0000000000102228 <.__start+0x98> bl 00000000001019a0 <begin+0x19a0> > 000000000010222c <.__start+0x9c> ld r2,40(r1) > 0000000000102230 <.__start+0xa0> mr r1,r3 > 0000000000102234 <.__start+0xa4> li r3,0 > 0000000000102238 <.__start+0xa8> std r3,0(r1) > 000000000010223c <.__start+0xac> bl 00000000005c6b28 <.mi_startup> > 0000000000102240 <.__start+0xb0> nop > 0000000000102244 <.__start+0xb4> b 0000000000102244 <.__start+0xb4> > > > Who is most appropriate to send such information to for powerpc64? > > === > Mark Millard > markmi at dsl-only.net
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