diff options
| author | Laurent Vivier <laurent@vivier.eu> | 2020-05-31 13:02:31 +0200 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2020-06-02 13:59:01 +0200 |
| commit | 6a0e8bb4956c34328f4624e20bd3a6c2b1d90adc (patch) | |
| tree | c6e6f7359039429fdacfeb55dd08f5423ffc21fd | |
| parent | 853a60b87024b2f5d7c0c54a432d7798cb679900 (diff) | |
| download | qemu-6a0e8bb4956c34328f4624e20bd3a6c2b1d90adc.zip qemu-6a0e8bb4956c34328f4624e20bd3a6c2b1d90adc.tar.gz qemu-6a0e8bb4956c34328f4624e20bd3a6c2b1d90adc.tar.bz2 | |
target/m68k: implement fmove.l #<data>,FPCR
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 <glaubitz@physik.fu-berlin.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200531110231.620711-1-laurent@vivier.eu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| -rw-r--r-- | target/m68k/translate.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 0f80888..c093f6c 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -4936,6 +4936,20 @@ static void gen_op_fmove_fcr(CPUM68KState *env, DisasContext *s, gen_store_fcr(s, AREG(insn, 0), mask); } return; + case 7: /* Immediate */ + if (REG(insn, 0) == 4) { + if (is_write || + (mask != M68K_FPIAR && mask != M68K_FPSR && + mask != M68K_FPCR)) { + gen_exception(s, s->base.pc_next, EXCP_ILLEGAL); + return; + } + tmp = tcg_const_i32(read_im32(env, s)); + gen_store_fcr(s, tmp, mask); + tcg_temp_free(tmp); + return; + } + break; default: break; } |