** Tags added: mips
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https://bugs.launchpad.net/bugs/1804678
Title:
qemu-3.1.0-rc0: mips emulation hangs when executing invalid
instructions
Status in QEMU:
New
Bug description:
QEMU version:
-------------
qemu-3.1.0-rc0 compiled from sources (earlier versions also affected)
Summary:
--------
QEMU MIPS system emulation hangs when trying to execute the following
invalid instructions:
71c5a9bf sdbbp 0x716a6
2c4745aa sltiu a3, v0, 0x45aa
f47539fb sdc1 f21, 0x39fb(v1)
5fa5e284 invalid
qemu-system-mips falls under an infinite loop condition and it needs
to be ended.
The issue has been reproduced in Ubuntu x64 host running Debian MIPS
32-bits guest with the following command line:
qemu-system-mips -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda
debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1
console=tty0"
It can also be reproduced using mips-linux-user, in which case throws
the following exception:
qemu-mips mips_loop_static.elf
qemu: unhandled CPU exception 0x10 - aborting
pc=0x004a9da0 HI=0x00000003 LO=0x00000002 ds 00e2 004a9da0 0
GPR00: r0 00000000 at fffffff8 v0 004a9da0 v1 004ad000
GPR04: a0 00000001 a1 7fffefc4 a2 7fffefcc a3 00000000
GPR08: t0 004ab854 t1 0ffffffe t2 81010100 t3 2f2f2f2f
GPR12: t4 7ffff1ad t5 004ab090 t6 004ab06c t7 004ab07c
GPR16: s0 00000000 s1 452ac505 s2 00400db4 s3 00400d38
GPR20: s4 00000000 s5 00000000 s6 00000000 s7 00000000
GPR24: t8 004ab0a8 t9 004a9da0 k0 00000000 k1 00000000
GPR28: gp 004b25a0 sp 7fffeec0 s8 7fffeec0 ra 0040041c
CP0 Status 0x24000010 Cause 0x00000000 EPC 0x00000000
Config0 0x80008482 Config1 0x9e190c8f LLAddr 0xffffffffffffffff
Config2 0x80000000 Config3 0x00000000
Config4 0x00000000 Config5 0x00000000
qemu:handle_cpu_signal received signal outside vCPU context @ pc=0x602dbad8
Testcase:
---------
C program to reproduce the problem:
unsigned char code[] =
"\x71\xC5\xA9\xBF\x2C\x47\x45\xAA\xF4\x75\x39\xFB\x5F\xA5\xE2\x84";
main()
{
int (*ret)() = (int(*)())code;
ret();
}
Also, find a statically compiled ELF attached.
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