Dear all, Currently I am learning about how kexec works in ARM kernel. I have cross-compiled kexec-tools successfully, but when I run kexec, it gives me kernel oops - undefined instruction. _______________ #> ./kexec -l zImage --command-line=`cat /proc/cmdline` #> ./kexec -e Starting new kernel Bye! . . Internal error: Oops - undefined instruction: 0 [#1] PREEMPT Modules linked in: wl(P)(0xbf1d8000) kernel version : 0068_262 RELEASE preempt mod_unload ARMv7 snd_usb_audio(0xbf1c5000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 snd_usb_lib(0xbf1c0000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 snd_seq_midi(0xbf1b6000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 snd_rawmidi(0xbf1ad000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 ftdi_sio(0xbf1a1000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 snd_hwdep(0xbf19a000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 usbhid(0xbf181000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 usbserial(0xbf177000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 sdp_mac(0xbf16e000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 usb_storage(0xbf161000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 ohci_hcd(0xbf155000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 ehci_hcd(0xbf146000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 usbcore(0xbf127000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 fpi(P)(0xbf120000) kernel version : 0068_262 RELEASE preempt mod_unload ARMv7 sdp_ahci(0xbf115000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 libata(0xbf0f4000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 sd_mod(0xbf0ea000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 sr_mod(0xbf0e2000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 cdrom(0xbf0d5000) kernel version : 1005_272 RELEASE preempt mod_unload ARMv7 CPU: 0 Tainted: P (2.6.30.9 #48) pc : [<747e4000>] lr : [<c002acbc>] psr: 60000013 sp : c768de58 ip : c6d92fc0 fp : c768de6c r10: 00000000 r9 : c768c000 r8 : c0025568 r7 : 00000000 r6 : 45584543 r5 : c6ee3000 r4 : 747e3000 r3 : 00000c02 r2 : 000005f8 r1 : 000005f8 r0 : 747e3000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 10c53c7d Table: 74690019 DAC: 00000015 Process kexec (pid: 501, stack limit = 0xc768c2e0) . . Backtrace: Function entered at [<c002abb4>] from [<c008cfe0>] r5:28121969 r4:c0477a70 Function entered at [<c008cf90>] from [<c005b4e0>] r4:fee1dead r3:45584543 Function entered at [<c005b34c>] from [<c00253c0>] r7:00000058 r6:410338d8 r5:41033ac4 r4:0d696914 Code: 00000000 00000000 00000000 00000000 (dc9d7fc2) _______________ I see the backtrace & lr. It guides me to: $ cat objdump.txt | grep c002acbc c002abc8: e59fc0ec ldr ip, [pc, #236] ; c002acbc <machine_kexec+0x108> c002acbc: c03dc768 .word 0xc03dc768 $ cat objdump.txt | grep c002abb4 c002abb4 <machine_kexec>: c002abb4: e1a0c00d mov ip, sp c008cfdc: ebfe76f4 bl c002abb4 <machine_kexec> c008d234: ebfe765e bl c002abb4 <machine_kexec> $ cat objdump.txt | grep c008cf90 c005b4dc: eb00c6ab bl c008cf90 <kernel_kexec> c008cf90 <kernel_kexec>: c008cf90: e1a0c00d mov ip, sp _______________ Can anyone help me what's wrong with "oops - undefined instruction" ? Does it mean there is something wrong with machine_kexec() call in kernel_kexec() function in <kernel_source>/kernel/kexec.c ? Or, is the problem located in linked modules? Thank you for your time. Regards, Anggriawan Sugianto
