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-
-[ARMv5] Integrator/CP regression when reading FPSID register
-
-There seems to be a regression in QEMU 2.1.0 which demonstrates itself
-when running the attached HelenOS Integrator/CP (i.e. ARMv5) image. The
-offending instruction seems to be:
-
-  vmrs r0, fpsid
-
-Upon its execution, HelenOS kernel receives an Undefined instruction
-exception (which it does not anticipate at that point) and crashes.
-
-QEMU 2.0.0 was not affected by this issue.
-
-Command line to reproduce with QEMU 2.1.0:
-
-$ qemu-system-arm -M integratorcp -kernel image.boot -s -S &
-$ /usr/local/cross/arm32/bin/arm-linux-gnueabi-gdb 
-...
-(gdb) target remote localhost:1234
-Remote debugging using localhost:1234
-warning: Can not parse XML target description; XML support was disabled at compile time
-0x00000000 in ?? ()
-(gdb) symbol-file kernel/kernel.raw
-Reading symbols from /home/jermar/software/HelenOS.mainline/kernel/kernel.raw...done.
-(gdb) break ras_check
-Breakpoint 1 at 0x80a021bc: file arch/arm32/src/ras.c, line 67.
-(gdb) c
-Continuing.
-
-Breakpoint 1, ras_check (n=1, istate=0x813e7f70) at arch/arm32/src/ras.c:67
-67	{
-(gdb) set radix 16
-Input and output radices now set to decimal 16, hex 10, octal 20.
-(gdb) print istate->pc
-$1 = 0x80a02458
-(gdb) disassemble 0x80a02458
-Dump of assembler code for function fpsid_read:
-   0x80a02454 <+0>:	vmrs	r0, fpsid                           <======= UNDEFINED EXCEPTION INSTRUCTION
-   0x80a02458 <+4>:	mov	pc, lr
-End of assembler dump.
-
-
-The Undefined instruction exception is not expected at this point when executing the VMRS r0,fpsid instruction.
\ No newline at end of file