Linux核心除錯4
阿新 • • 發佈：2019-02-13
./firstdrvtest on
Unable to handle kernel paging request at virtual address 56000050
核心使用56000050來訪問時發生了錯誤
pgd = c3eb0000
[56000050] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in: first_drv
CPU: 0 Not tainted (2.6.22.6 #1)
PC is at first_drv_open+0x18(該指令的偏移)/0x3c(該函式的總大小) [first_drv]
PC就是發生錯誤的指令的地址
大多時候，PC值只會給出一個地址，不到指示說是在哪個函式裡
LR is at chrdev_open+0x14c/0x164
LR暫存器的值
pc = 0xbf000018
pc : [<bf000018>] lr : [<c008d888>] psr: a0000013
sp : c3c7be88 ip : c3c7be98 fp : c3c7be94
r10: 00000000 r9 : c3c7a000 r8 : c049abc0
r7 : 00000000 r6 : 00000000 r5 : c3e740c0 r4 : c06d41e0
r3 : bf000000 r2 : 56000050 r1 : bf000964 r0 : 00000000
執行這條導致錯誤的指令時各個暫存器的值
Flags: NzCv IRQs on FIQs on Mode SVC_32 Segment user
Control: c000717f Table: 33eb0000 DAC: 00000015
Process firstdrvtest (pid: 777, stack limit = 0xc3c7a258)
發生錯誤時當前程序的名稱是firstdrvtest
棧
Stack: (0xc3c7be88 to 0xc3c7c000)
be80: c3c7bebc c3c7be98 c008d888 bf000010 00000000 c049abc0
bea0: c3e740c0 c008d73c c0474e20 c3e766a8 c3c7bee4 c3c7bec0 c0089e48 c008d74c
bec0: c049abc0 c3c7bf04 00000003 ffffff9c c002c044 c3d10000 c3c7befc c3c7bee8
bee0: c0089f64 c0089d58 00000000 00000002 c3c7bf68 c3c7bf00 c0089fb8 c0089f40
bf00: c3c7bf04 c3e766a8 c0474e20 00000000 00000000 c3eb1000 00000101 00000001
bf20: 00000000 c3c7a000 c04a7468 c04a7460 ffffffe8 c3d10000 c3c7bf68 c3c7bf48
bf40: c008a16c c009fc70 00000003 00000000 c049abc0 00000002 bec1fee0 c3c7bf94
bf60: c3c7bf6c c008a2f4 c0089f88 00008520 bec1fed4 0000860c 00008670 00000005
bf80: c002c044 4013365c c3c7bfa4 c3c7bf98 c008a3a8 c008a2b0 00000000 c3c7bfa8
bfa0: c002bea0 c008a394 bec1fed4 0000860c 00008720 00000002 bec1fee0 00000001
bfc0: bec1fed4 0000860c 00008670 00000002 00008520 00000000 4013365c bec1fea8
bfe0: 00000000 bec1fe84 0000266c 400c98e0 60000010 00008720 00000000 00000000
Backtrace: (回溯)
[<bf000000>] (first_drv_open+0x0/0x3c [first_drv]) from [<c008d888>] (chrdev_open+0x14c/0x164)
[<c008d73c>] (chrdev_open+0x0/0x164) from [<c0089e48>] (__dentry_open+0x100/0x1e8)
r8:c3e766a8 r7:c0474e20 r6:c008d73c r5:c3e740c0 r4:c049abc0
[<c0089d48>] (__dentry_open+0x0/0x1e8) from [<c0089f64>] (nameidata_to_filp+0x34/0x48)
[<c0089f30>] (nameidata_to_filp+0x0/0x48) from [<c0089fb8>] (do_filp_open+0x40/0x48)
r4:00000002
[<c0089f78>] (do_filp_open+0x0/0x48) from [<c008a2f4>] (do_sys_open+0x54/0xe4)
r5:bec1fee0 r4:00000002
[<c008a2a0>] (do_sys_open+0x0/0xe4) from [<c008a3a8>] (sys_open+0x24/0x28)
[<c008a384>] (sys_open+0x0/0x28) from [<c002bea0>] (ret_fast_syscall+0x0/0x2c)
Code: e24cb004 e59f1024 e3a00000 e5912000 (e5923000)
Unable to handle kernel paging request at virtual address 56000050
核心使用56000050來訪問時發生了錯誤
pgd = c3eb0000
[56000050] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in: first_drv
CPU: 0 Not tainted (2.6.22.6 #1)
PC is at first_drv_open+0x18(該指令的偏移)/0x3c(該函式的總大小) [first_drv]
PC就是發生錯誤的指令的地址
大多時候，PC值只會給出一個地址，不到指示說是在哪個函式裡
LR is at chrdev_open+0x14c/0x164
LR暫存器的值
pc = 0xbf000018
pc : [<bf000018>] lr : [<c008d888>] psr: a0000013
sp : c3c7be88 ip : c3c7be98 fp : c3c7be94
r10: 00000000 r9 : c3c7a000 r8 : c049abc0
r7 : 00000000 r6 : 00000000 r5 : c3e740c0 r4 : c06d41e0
r3 : bf000000 r2 : 56000050 r1 : bf000964 r0 : 00000000
執行這條導致錯誤的指令時各個暫存器的值
Flags: NzCv IRQs on FIQs on Mode SVC_32 Segment user
Control: c000717f Table: 33eb0000 DAC: 00000015
Process firstdrvtest (pid: 777, stack limit = 0xc3c7a258)
發生錯誤時當前程序的名稱是firstdrvtest
棧
Stack: (0xc3c7be88 to 0xc3c7c000)
be80: c3c7bebc c3c7be98 c008d888 bf000010 00000000 c049abc0
bea0: c3e740c0 c008d73c c0474e20 c3e766a8 c3c7bee4 c3c7bec0 c0089e48 c008d74c
bec0: c049abc0 c3c7bf04 00000003 ffffff9c c002c044 c3d10000 c3c7befc c3c7bee8
bee0: c0089f64 c0089d58 00000000 00000002 c3c7bf68 c3c7bf00 c0089fb8 c0089f40
bf00: c3c7bf04 c3e766a8 c0474e20 00000000 00000000 c3eb1000 00000101 00000001
bf20: 00000000 c3c7a000 c04a7468 c04a7460 ffffffe8 c3d10000 c3c7bf68 c3c7bf48
bf40: c008a16c c009fc70 00000003 00000000 c049abc0 00000002 bec1fee0 c3c7bf94
bf60: c3c7bf6c c008a2f4 c0089f88 00008520 bec1fed4 0000860c 00008670 00000005
bf80: c002c044 4013365c c3c7bfa4 c3c7bf98 c008a3a8 c008a2b0 00000000 c3c7bfa8
bfa0: c002bea0 c008a394 bec1fed4 0000860c 00008720 00000002 bec1fee0 00000001
bfc0: bec1fed4 0000860c 00008670 00000002 00008520 00000000 4013365c bec1fea8
bfe0: 00000000 bec1fe84 0000266c 400c98e0 60000010 00008720 00000000 00000000
Backtrace: (回溯)
[<bf000000>] (first_drv_open+0x0/0x3c [first_drv]) from [<c008d888>] (chrdev_open+0x14c/0x164)
[<c008d73c>] (chrdev_open+0x0/0x164) from [<c0089e48>] (__dentry_open+0x100/0x1e8)
r8:c3e766a8 r7:c0474e20 r6:c008d73c r5:c3e740c0 r4:c049abc0
[<c0089d48>] (__dentry_open+0x0/0x1e8) from [<c0089f64>] (nameidata_to_filp+0x34/0x48)
[<c0089f30>] (nameidata_to_filp+0x0/0x48) from [<c0089fb8>] (do_filp_open+0x40/0x48)
r4:00000002
[<c0089f78>] (do_filp_open+0x0/0x48) from [<c008a2f4>] (do_sys_open+0x54/0xe4)
r5:bec1fee0 r4:00000002
[<c008a2a0>] (do_sys_open+0x0/0xe4) from [<c008a3a8>] (sys_open+0x24/0x28)
[<c008a384>] (sys_open+0x0/0x28) from [<c002bea0>] (ret_fast_syscall+0x0/0x2c)
Code: e24cb004 e59f1024 e3a00000 e5912000 (e5923000)