On 05/10/2012 06:32 PM, John David Anglin wrote:
(..)
> I asked where the crash occurred because PA 2.0 mnemonics are used in
> the tmpalias
> code. On the other hand, if the failure occurs on the first flush
> instruction, the issue is likely
> in the TLB insert code in entry.S.
Hi John,
I think the crash occurs at the first 'fdc,m r1(ret0)', but I don't read
PA assembly that much, so you might want to cross-check by yourself :)
Here is the crash dump:
---
_______________________________
< Your System ate a SPARC! Gah! >
-------------------------------
\ ^__^
(__)\ )\/\
U ||----w |
|| ||
swapper (pid 1): Illegal instruction (code 8)
YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00000000000000000000000000000000 Not tainted
r00-03 00000000 00000001 1019d550 105ebbc0
r04-07 00000000 00000017 16640000 ffeffff6
r08-11 0f2ff000 0f000000 00000001 fff00ff6
r12-15 1742c000 00000017 00000000 00000020
r16-19 00000000 00000043 1662f000 fffff000
r20-23 000005de 00118277 00000001 00000020
r24-27 00000000 00000000 0000bbc0 104f2000
r28-31 0f2ff000 00000001 17430600 102691d8
sr00-03 00000000 00000001 00000000 00000000
sr04-07 00000000 00000000 00000000 00000000
IASQ: 00000000 00000000 IAOQ: 10100c10 10100c14
IIR: 078112a0 ISR: 00000000 IOR: 0f2ff000
CPU: 0 CR30: 17430000 CR31: 00000002
ORIG_R28: 1662f000
IAOQ[0]: flush_dcache_page_asm+0x28/0x7c
IAOQ[1]: flush_dcache_page_asm+0x2c/0x7c
RP(r2): __get_user_pages+0x2c8/0x370
Backtrace:
[<1019d550>] __get_user_pages+0x2c8/0x370
[<101bcf8c>] get_arg_page+0x5c/0x108
[<101bd250>] copy_strings+0x114/0x25c
[<101bd3b4>] copy_strings_kernel+0x1c/0x30
[<101be78c>] do_execve+0x1f4/0x370
[<101180a0>] sys_execve+0x44/0x70
[<10103084>] __execve+0x20/0x34
[<1012a224>] vprintk+0x39c/0x3f0
[<1010e074>] printk+0x24/0x30
[<101110cc>] init_post+0x6c/0x148
[<105a1624>] kernel_init+0x218/0x250
Backtrace:
[<1011329c>] die_if_kernel+0x138/0x1b0
[<101134ec>] handle_interruption+0x1d8/0x6d8
[<10104078>] intr_check_sig+0x0/0x34
[<1018975c>] __alloc_pages_nodemask+0x1a4/0x688
---
And here is the disassembly of function flush_dcache_page_asm:
---
10100be8 <flush_dcache_page_asm>:
10100be8: 23 80 01 e0 ldil L%f000000,ret0
10100bec: d3 5a 1b 07 extrw,u r26,24,25,r26
10100bf0: d7 99 0c 0a depw r25,31,22,ret0
10100bf4: d7 80 1c 14 depwi 0,31,12,ret0
10100bf8: 07 80 12 00 pdtlb r0(ret0)
10100bfc: 20 39 c2 08 ldil L%104f2000,r1
10100c00: 48 21 00 b8 ldw 5c(r1),r1
10100c04: d7 22 19 9f depwi,z 1,19,1,r25
10100c08: 0b 3c 06 39 add ret0,r25,r25
10100c0c: 08 39 04 39 sub r25,r1,r25
10100c10: 07 81 12 a0 fdc,m r1(ret0)
10100c14: 07 81 12 a0 fdc,m r1(ret0)
10100c18: 07 81 12 a0 fdc,m r1(ret0)
10100c1c: 07 81 12 a0 fdc,m r1(ret0)
10100c20: 07 81 12 a0 fdc,m r1(ret0)
10100c24: 07 81 12 a0 fdc,m r1(ret0)
10100c28: 07 81 12 a0 fdc,m r1(ret0)
10100c2c: 07 81 12 a0 fdc,m r1(ret0)
10100c30: 07 81 12 a0 fdc,m r1(ret0)
10100c34: 07 81 12 a0 fdc,m r1(ret0)
10100c38: 07 81 12 a0 fdc,m r1(ret0)
10100c3c: 07 81 12 a0 fdc,m r1(ret0)
10100c40: 07 81 12 a0 fdc,m r1(ret0)
10100c44: 07 81 12 a0 fdc,m r1(ret0)
10100c48: 07 81 12 a0 fdc,m r1(ret0)
10100c4c: 83 3c 9f 7d cmpb,<< ret0,r25,10100c10
<flush_dcache_page_asm+0x28>
10100c50: 07 81 12 a0 fdc,m r1(ret0)
10100c54: 00 00 04 00 sync
10100c58: 07 20 12 00 pdtlb r0(r25)
10100c5c: e8 40 c0 00 bv r0(rp)
10100c60: 08 00 02 40 nop
---
Best regards,
V.
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