Benjamin Herrenschmidt wrote:
On Thu, 2013-02-21 at 21:38 +0100, Phileas Fogg wrote:
The new 8 bytes at offset 0x90 in dt.dump.hex look suspicously like
the kernel virtual address: 0xc00000000001a4a0.
It does indeed. What does that address correspond to in the kernel
text ? Can you disassemble around it with "objdump -D vmlinux" ?
Cheers,
Ben.
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Here.
I used OpenWRT ELF for testing and it's stripped.
Then i compiled Linux 3.8 myself and didn't strip it.
Addresses are different in both cases but the code is the same and
it is kexec code :)
Stripped OpenWRT image:
------------------------
c00000000001a474: 48 00 00 05 bl 0xc00000000001a478
c00000000001a478: 7c a8 02 a6 mflr r5
c00000000001a47c: 38 a5 00 1c addi r5,r5,28
c00000000001a480: 7c 21 0b 78 mr r1,r1
c00000000001a484: 80 85 00 00 lwz r4,0(r5)
c00000000001a488: 2c 04 00 00 cmpwi r4,0
c00000000001a48c: 40 82 00 62 bnea- 0x60
c00000000001a490: 4b ff ff f0 b 0xc00000000001a480
c00000000001a494: 00 00 00 00 .long 0x0
c00000000001a498: a0 6d 00 48 lhz r3,72(r13)
c00000000001a49c: 48 00 00 11 bl 0xc00000000001a4ac
c00000000001a4a0: 38 80 00 02 li r4,2 <-------- !!!
c00000000001a4a4: 98 8d 00 4b stb r4,75(r13)
c00000000001a4a8: 4b ff ff cc b 0xc00000000001a474
c00000000001a4ac: 39 20 00 02 li r9,2
c00000000001a4b0: 39 40 00 30 li r10,48
c00000000001a4b4: 7d 68 02 a6 mflr r11
c00000000001a4b8: 7d 80 00 a6 mfmsr r12
c00000000001a4bc: 7d 89 48 78 andc r9,r12,r9
c00000000001a4c0: 7d 8a 50 78 andc r10,r12,r10
c00000000001a4c4: 7d 21 01 64 mtmsrd r9,1
Unstripped Linux 3.8 kernel:
-----------------------------
c00000000001c02c <.kexec_wait>:
c00000000001c02c: 48 00 00 05 bl c00000000001c030
<.kexec_wait+0x4>
c00000000001c030: 7c a8 02 a6 mflr r5
c00000000001c034: 38 a5 00 1c addi r5,r5,28
c00000000001c038: 7c 21 0b 78 mr r1,r1
c00000000001c03c: 80 85 00 00 lwz r4,0(r5)
c00000000001c040: 2c 04 00 00 cmpwi r4,0
c00000000001c044: 40 82 00 62 bnea- 60 <reloc_start+0x60>
c00000000001c048: 4b ff ff f0 b c00000000001c038
<.kexec_wait+0xc>
c00000000001c04c <kexec_flag>:
c00000000001c04c: 00 00 00 00 .long 0x0
c00000000001c050 <.kexec_smp_wait>:
c00000000001c050: a0 6d 00 48 lhz r3,72(r13)
c00000000001c054: 48 00 00 11 bl c00000000001c064 <real_mode>
c00000000001c058: 38 80 00 02 li r4,2 <---------- !!!
c00000000001c05c: 98 8d 00 4b stb r4,75(r13)
c00000000001c060: 4b ff ff cc b c00000000001c02c <.kexec_wait>
c00000000001c064 <real_mode>:
c00000000001c064: 39 20 00 02 li r9,2
c00000000001c068: 39 40 00 30 li r10,48
regards
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