On 08/25/2010 04:00 PM, Jason Wang wrote:
0000000000400bb8<__setup_args>:
400bb8: 41 55 push %r13
400bba: 41 54 push %r12
400bbc: 55 push %rbp
400bbd: 53 push %rbx
400bbe: 48 8b 1d db e7 00 00 mov 0xe7db(%rip),%rbx # 40f3a0<__args>
400bc5: 41 bc 80 ec 40 00 mov $0x40ec80,%r12d
400bcb: 41 bd 80 f0 40 00 mov $0x40f080,%r13d
400bd1: eb 42 jmp 400c15<__setup_args+0x5d>
400bd3: 4d 89 65 00 mov %r12,0x0(%r13)
400bd7: 0f b6 28 movzbl (%rax),%ebp
400bda: 40 84 ed test %bpl,%bpl
400bdd: 75 16 jne 400bf5<__setup_args+0x3d>
400bdf: eb 21 jmp 400c02<__setup_args+0x4a>
400be1: 41 88 2c 24 mov %bpl,(%r12)
400be5: 49 83 c4 01 add $0x1,%r12
400bed: 0f b6 2b movzbl (%rbx),%ebp
400bf0: 40 84 ed test %bpl,%bpl
400bf3: 74 0d je 400c02<__setup_args+0x4a>
400bf5: 40 0f be fd movsbl %bpl,%edi
400bf9: e8 a6 ff ff ff callq 400ba4<isblank>
400bfe: 84 c0 test %al,%al
400c00: 74 df je 400be1<__setup_args+0x29>
400c02: 49 83 c5 08 add $0x8,%r13
400c06: 41 c6 04 24 00 movb $0x0,(%r12)
400c0b: 49 83 c4 01 add $0x1,%r12
400c0f: eb 04 jmp 400c15<__setup_args+0x5d>
400c11: 48 83 c3 01 add $0x1,%rbx
400c15: 0f b6 2b movzbl (%rbx),%ebp
400c18: 40 0f be fd movsbl %bpl,%edi
400c1c: e8 83 ff ff ff callq 400ba4<isblank>
....
Looks completely unrelated. We access the command line string and fault.
You can hack qemu-kvm to vmstop() on KVM_EXIT_SHUTDOWN and examine
%rbx. It's probably corrupted. Maybe we need to copy the multiboot
command line early to prevent the rest of the code from stomping on it.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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