On 5/31/20 4:02 AM, Laurent Vivier wrote: > The immediate value mode was ignored and instruction execution > ends to an invalid access mode. > > This was found running 'R' that set FPSR to 0 at startup with > a 'fmove.l #0,FPSR' in qemu-system-m68k emulation and triggers a > kernel crash: > > [ 56.640000] *** ADDRESS ERROR *** FORMAT=2 > [ 56.640000] Current process id is 728 > [ 56.640000] BAD KERNEL TRAP: 00000000 > [ 56.640000] Modules linked in: sg evdev mac_hid ip_tables x_tables > sha1_generic hmac ipv6 nf_defrag_ipv6 autofs4 ext4 crc16 mbcache jbd2 > crc32c_generic sd_mod t10_pi crc_t10dif crct10dif_generic crct10dif_common > sr_mod cdrom mac_esp macsonic esp_scsi > [ 56.640000] PC: [<00016a2c>] X_UNSUPP+0x2c/0x3c > [ 56.640000] SR: 2004 SP: 3eb5e68c a2: c02e239a > [ 56.640000] d0: 00000040 d1: 00000002 d2: 8002adec d3: 8002ad50 > [ 56.640000] d4: 8002c768 d5: 0000000d a0: ffffffc2 a1: ffffffc1 > [ 56.640000] Process R (pid: 728, task=a3dfda5d) > [ 56.640000] Frame format=2 instr addr=00000000 > [ 56.650000] Stack from 3a4d9f30: > [ 56.650000] 41000000 00000002 00000002 ffffffc2 ffffffc1 1fff0000 > 80000000 00000000 > [ 56.650000] 3fbf0000 80000000 00000000 00000000 20000000 00000000 > 7fff0000 ffffffff > [ 56.650000] ffffffff 00000000 00050008 00000000 8000067c c02c2000 > efffee20 000002d8 > [ 56.650000] 00002a28 3a4d9f98 00000002 00000014 fffffffe 8002c768 > 00000002 00000041 > [ 56.650000] 00000002 c041fc58 c0743758 ffffffff 00000000 0008c075 > 00002b24 00000012 > [ 56.650000] 000007d0 00000024 00000002 c05bef04 c05bef04 0000005e > 00000077 c28aca70 > [ 56.650000] Call Trace: [<00050008>] copy_overflow+0x10/0x28 > [ 56.650000] [<00002a28>] buserr+0x20/0x28 > [ 56.650000] [<0008c075>] bpf_check+0x57f/0x1cfa > [ 56.650000] [<00002b24>] syscall+0x8/0xc > [ 56.650000] [<0000c019>] dn_sched_init+0x75/0x88 > [ 56.650000] Code: 1017 0200 00f0 0c00 0040 66ff 0000 05ac <f23c> 8800 0000 > 0000 f23c 9000 0000 0000 222e ff84 082e 0005 ff1c 6600 000a 0281 > [ 56.650000] Disabling lock debugging due to kernel taint > ... > > Reported-by: John Paul Adrian Glaubitz <[email protected]> > Signed-off-by: Laurent Vivier <[email protected]> > --- > target/m68k/translate.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+)
Reviewed-by: Richard Henderson <[email protected]> r~
