On Sunday 13 November 2005 13:20, Blaisorblade wrote:
> On Sunday 13 November 2005 20:32, Jeff Dike wrote:
> > On Sat, Nov 12, 2005 at 07:36:41PM -0600, Rob Landley wrote:
> > > Stub registers -
> > > 0 - 9090909090909090
> > > 1 - 9090909090909090
> > > 2 - 9090909090909090
> > > 3 - 9090909090909090
> > > 4 - 9090909090909090
> > > 5 - 9090909090909090
> > > 6 - 9090909090909090
> > > 7 - 9090909090909090
> > > 8 - 9090909090909090
> > > 9 - 9090909090909090
> > > 10 - 0
> > > 11 - 9090909090909090
> > > 12 - 9090909090909090
> > > 13 - 9090909090909090
> > > 14 - 9090909090909090
> > > 15 - ffffffffffffffff
> > > 16 - 9090909090909090
> > > 17 - 33
> > > 18 - 292
> > > 19 - 9090909090909090
> > > 20 - 2b
> >
> > I remain baffled by this. There is nothing valid there. At the very
> > least RSP and RIP should be reasonable, and they're not.
>
> Jeff, given the current state, I think that we need a look at the
> disassembly - or better:
> *) build a 2.6.15-rc1 binary with Rob's config.
> *) test that it works
> *) send him and see if it works for him
> *) finally, conclude GCC is misassembling stuff and take measures for this
> case.
>
> Meanwhile, Rob, can you provide the disassembly? We need to look at
> disassembled arch/um/sys-x86_64/stub_segv.c arch/um/kernel/skas/clone.c,
> i.e. stub_segv_handler() and stub_clone_handler().
00000000600c5150 <stub_segv_handler>:
600c5150: 48 89 d1 mov %rdx,%rcx
600c5153: 48 ba 00 f0 ff bf 7f mov $0x7fbffff000,%rdx
600c515a: 00 00 00
600c515d: 48 8b 81 d8 00 00 00 mov 0xd8(%rcx),%rax
600c5164: 48 89 42 08 mov %rax,0x8(%rdx)
600c5168: 8b 81 c0 00 00 00 mov 0xc0(%rcx),%eax
600c516e: 89 02 mov %eax,(%rdx)
600c5170: 8b 81 c8 00 00 00 mov 0xc8(%rcx),%eax
600c5176: 89 42 10 mov %eax,0x10(%rdx)
600c5179: 48 c7 c0 27 00 00 00 mov $0x27,%rax
600c5180: 0f 05 syscall
600c5182: 48 89 c7 mov %rax,%rdi
600c5185: 48 c7 c0 3e 00 00 00 mov $0x3e,%rax
600c518c: 48 c7 c6 0a 00 00 00 mov $0xa,%rsi
600c5193: 0f 05 syscall
600c5195: 48 89 cc mov %rcx,%rsp
600c5198: 48 c7 c0 0f 00 00 00 mov $0xf,%rax
600c519f: 0f 05 syscall
600c51a1: c3 retq
00000000600c5000 <stub_clone_handler>:
600c5000: 41 57 push %r15
600c5002: 41 56 push %r14
600c5004: 41 55 push %r13
600c5006: 41 54 push %r12
600c5008: 41 bc 38 00 00 00 mov $0x38,%r12d
600c500e: 55 push %rbp
600c500f: 48 bd 00 f0 ff bf 7f mov $0x7fbffff000,%rbp
600c5016: 00 00 00
600c5019: 53 push %rbx
600c501a: bb 11 84 00 00 mov $0x8411,%ebx
600c501f: 48 83 ec 08 sub $0x8,%rsp
600c5023: e8 70 83 f4 ff callq 6000d398 <[EMAIL PROTECTED]>
600c5028: 48 89 df mov %rbx,%rdi
600c502b: 89 c6 mov %eax,%esi
600c502d: 41 89 c0 mov %eax,%r8d
600c5030: 48 b8 f8 ef ff bf 7f mov $0x7fbfffeff8,%rax
600c5037: 00 00 00
600c503a: c1 ee 1f shr $0x1f,%esi
600c503d: 42 8d 34 06 lea (%rsi,%r8,1),%esi
600c5041: d1 fe sar %esi
600c5043: 48 63 f6 movslq %esi,%rsi
600c5046: 48 01 c6 add %rax,%rsi
600c5049: 4c 89 e0 mov %r12,%rax
600c504c: 0f 05 syscall
600c504e: 48 85 c0 test %rax,%rax
600c5051: 48 89 c3 mov %rax,%rbx
600c5054: 75 78 jne 600c50ce
<stub_clone_handler+0xce>
600c5056: b8 65 00 00 00 mov $0x65,%eax
600c505b: 48 89 df mov %rbx,%rdi
600c505e: 48 89 de mov %rbx,%rsi
600c5061: 48 89 da mov %rbx,%rdx
600c5064: 49 89 da mov %rbx,%r10
600c5067: 0f 05 syscall
600c5069: 48 85 c0 test %rax,%rax
600c506c: 48 89 c3 mov %rax,%rbx
600c506f: 75 5d jne 600c50ce
<stub_clone_handler+0xce>
600c5071: b8 26 00 00 00 mov $0x26,%eax
600c5076: bf 01 00 00 00 mov $0x1,%edi
600c507b: 48 be 10 f0 ff bf 7f mov $0x7fbffff010,%rsi
600c5082: 00 00 00
600c5085: 48 89 da mov %rbx,%rdx
600c5088: 0f 05 syscall
600c508a: 48 85 c0 test %rax,%rax
600c508d: 48 89 c3 mov %rax,%rbx
600c5090: 75 3c jne 600c50ce
<stub_clone_handler+0xce>
600c5092: a1 08 f0 ff bf 7f 00 mov 0x7fbffff008,%eax
600c5099: 00 00
Rob
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