Good Morning :-)
Am 19.03.2015 um 01:57 schrieb Andy Lutomirski:
> Stefan, do you happen to know whether your disassembly of page_fault
> came from the instructions in memory or if they came from the vmlinux
> file? Not that I have any relevant ideas there.
I think they came from memory. At least, the disassemble in crash...
crash> disassemble page_fault
Dump of assembler code for function page_fault:
0xffffffff816834a0 <+0>: data32 xchg %ax,%ax
0xffffffff816834a3 <+3>: data32 xchg %ax,%ax
0xffffffff816834a6 <+6>: data32 xchg %ax,%ax
0xffffffff816834a9 <+9>: sub $0x78,%rsp
0xffffffff816834ad <+13>: callq 0xffffffff81683620 <error_entry>
0xffffffff816834b2 <+18>: mov %rsp,%rdi
0xffffffff816834b5 <+21>: mov 0x78(%rsp),%rsi
0xffffffff816834ba <+26>: movq $0xffffffffffffffff,0x78(%rsp)
0xffffffff816834c3 <+35>: callq 0xffffffff810504e0 <do_page_fault>
0xffffffff816834c8 <+40>: jmpq 0xffffffff816836d0 <error_exit>
End of assembler dump.
...is different than the one from loading vmlinux in gdb:
Reading symbols from vmlinux-4.0.0-rc3-2.gd5c547f-desktop...done.
Reading symbols from
/usr/lib/debug/boot/vmlinux-4.0.0-rc3-2.gd5c547f-desktop.debug...done.
(gdb) disassemble page_fault
Dump of assembler code for function page_fault:
0xffffffff816834a0 <+0>: data16 xchg %ax,%ax
0xffffffff816834a3 <+3>: callq *0x7a5b07(%rip) #
0xffffffff81e28fb0 <pv_irq_ops+48>
0xffffffff816834a9 <+9>: sub $0x78,%rsp
0xffffffff816834ad <+13>: callq 0xffffffff81683620 <error_entry>
0xffffffff816834b2 <+18>: mov %rsp,%rdi
0xffffffff816834b5 <+21>: mov 0x78(%rsp),%rsi
0xffffffff816834ba <+26>: movq $0xffffffffffffffff,0x78(%rsp)
0xffffffff816834c3 <+35>: callq 0xffffffff810504e0 <do_page_fault>
0xffffffff816834c8 <+40>: jmpq 0xffffffff816836d0 <error_exit>
End of assembler dump.
Best regards,
Stefan
--
Stefan Seyfried
Linux Consultant & Developer -- GPG Key: 0x731B665B
B1 Systems GmbH
Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
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