clang 3.9.0 buildkernel on old powerpc64's vs. trying to build hwpmc_e500.o and the like. . .
Roman Divacky
rdivacky at vlakno.cz
Mon Dec 12 21:11:58 UTC 2016
Ping.... Can you take a look Nathan?
Thanks! Roman
On Thu, Dec 08, 2016 at 11:14:52PM +0100, Roman Divacky wrote:
> 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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