RTEMS - SPARC ut700 fp disabled exception upon RTEMS startup
Jiri Gaisler
jiri at gaisler.se
Sat Oct 22 14:48:24 UTC 2016
It seems that you have compiled RTEMS with a gcc version that can use
%fpu registers to move integer data. The work-around could be to compile
the kernel with -msoft-float, or to move to a (later) version of gcc
that does not do this anymore. Which gcc version do you use?
Jiri.
On 22/10/16 01:22, Duran, Steve (JSC-ER611) wrote:
> I am trying to get and RTEMS kernel to boot on the SPARC ut700
> development board. There appears to be an issue in the RTEMS
> networking code that must use floating point, but for some reason the
> FPU has been disabled.
>
> Details below. Any insights into how to resolve this issue would be
> appreciated.
>
> Development environment setup on:
> Setup on:
> CentOS Linux release 7.2.1511 (Core)
> Linux spartan117 3.10.0-327.22.2.el7.x86_64 #1 SMP Thu Jun 23 17:05:11
> UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>
> $ git clone git://git.rtems.org/rtems.git rtems
> $ git checkout -b rtems411 origin/4.11
>
> Loading through grmon2, starting to run, error messages, and some
> debug info:
>
> GRMON2 LEON debug monitor v2.0.74 32-bit pro version
>
> Copyright (C) 2016 Cobham Gaisler - All rights reserved.
> For latest updates, go to http://www.gaisler.com/
> <http://www.gaisler.com/>
> Comments or bug-reports to support at gaisler.com
> <mailto:support at gaisler.com>
>
> using port /dev/ttyUSB4 @ 460800 baud
> Device ID: 0x699
> GRLIB build version: 4110
> Detected system: UT699E/UT700
> Detected frequency: 125 MHz
>
> Component Vendor
> LEON3-FT SPARC V8 Processor Cobham Gaisler
> AHB Debug UART Cobham Gaisler
> JTAG Debug Link Cobham Gaisler
> Fast 32-bit PCI Bridge Cobham Gaisler
> PCI/AHB DMA controller Cobham Gaisler
> GR Ethernet MAC Cobham Gaisler
> GRSPW2 SpaceWire Serial Link Cobham Gaisler
> GRSPW2 SpaceWire Serial Link Cobham Gaisler
> GRSPW2 SpaceWire Serial Link Cobham Gaisler
> GRSPW2 SpaceWire Serial Link Cobham Gaisler
> MIL-STD-1553B Interface Cobham Gaisler
> Memory controller with EDAC Cobham Gaisler
> AHB/APB Bridge Cobham Gaisler
> LEON3 Debug Support Unit Cobham Gaisler
> AHB/APB Bridge Cobham Gaisler
> OC CAN AHB interface Cobham Gaisler
> Generic UART Cobham Gaisler
> Multi-processor Interrupt Ctrl. Cobham Gaisler
> Modular Timer Unit Cobham Gaisler
> Clock gating unit Cobham Gaisler
> PCI Arbiter European Space Agency
> General Purpose I/O port Cobham Gaisler
> AHB Status Register Cobham Gaisler
> SPI Controller Cobham Gaisler
> General Purpose Register Cobham Gaisler
>
> Use command 'info sys' to print a detailed report of attached cores
>
>
> 40085000 .eefs_ram 512.0kB / 512.0kB
> [===============>] 100%
> 40000000 .tarfs_ram 530.0kB / 530.0kB
> [===============>] 100%
> 40405000 .text 815.8kB / 815.8kB
> [===============>] 100%
> 404D0F20 .rtemsroset 304B
> [===============>] 100%
> 404D1050 .data 13.3kB / 13.3kB
> [===============>] 100%
> 404D4560 .jcr 4B
> [===============>] 100%
> Total size: 1.83MB (362.50kbit/s)
> Entry point 0x40405000
> Image
> /home/sduran/sparc_leon3/SPARC_LEON3_Workspace/ut700/rtems4.11-kernel/rki.elf
> loaded
>
>
> RTEMS Kernel Image Booting
>
>
> *** RTEMS Info ***
> COPYRIGHT (c) 1989-2008.
> On-Line Applications Research Corporation (OAR).
> rtems-4.10.99.0(SPARC/w/FPU/leon3)
>
>
> BSP Ticks Per Second = 100
> *** End RTEMS info ***
>
> Populating Root file system from TAR file.
> Starting RTEMS network configuration
> RTEMS network config: All structures filled out, now calling init
> functions
> Convert ethernet address
> Converting: 00:00:7a:cc:00:16
> Calling rtems_bsdnet_initialize_network
> greth: driver attached
> **** PHY ****
> Vendor: 80017 Device: 9 Revision: 0
> Current Operating Mode: 100 Mbit Full Duplex
> Autonegotiation Time: 1739ms
> RTEMS bsdnet_initialize_network returned OK
> Hostname is gfe02.local
> Device gr_eth1, netmask 255.255.255.0, address 139.169.132.128
> gateway 139.169.132.1, dns1 139.169.132.1, dns2 (null)
>
>
> Starting the FTP Server.
> syslog: ftpd: FTP daemon started (1 session max)
> Setting up filesystems.
> Initializing Local Commands.
> Running /shell-init.
>
> 1: mkdir ram0
> 2: mkdir ram
> 3: mkrfs /dev/rd0
> 4: mount -t rfs /dev/rd0 /ram0
> mounted /dev/rd0 -> /ram0
> 5: hello
> Hello RTEMS!
> Create your own command here!
> Starting shell....
>
>
> RTEMS Shell on /dev/console. Use 'help' to list commands.
> [/] # Unexpected trap (0x04) at address 0x404A6764
> fp disabled
>
> Program exited normally.
>
> From UT700_LEON_Functional_Manual.pdf
> Trap table on page 18:
> TRAP TT PRI Description
> fp_disabled 0x04 6 FP instruction while FPU disabled
>
> grmon2> dis 0x404A6764
> 0x404a6764: d11861b0 ldd [%g1 + 0x1B0], %f8
> <_svfprintf_r+100>
> 0x404a6768: a410a250 or %g2, 0x250, %l2
> <_svfprintf_r+104>
> 0x404a676c: 39101341 sethi %hi(0x404D0400), %i4
> <_svfprintf_r+108>
>
> grmon2> bt
> Inside trap/irq
>
> %pc %sp
> #0 0x40417e40 0x404e6158 <syscall+0>
> #1 0x404ba880 0x404e61b8 <_CPU_Fatal_halt+0x8>
> #2 0x40442d68 0x404e6218 <_Terminate+0x48>
> #3 0x40441720 0x404e6288 <rtems_fatal+0xc>
> #4 0x40416044 0x404e62e8 <bsp_spurious_handler+0xc>
> #5 0x404bae24 0x404e6350
> #6 0x404a6710 0x40528180 <_svfprintf_r+0x10>
> #7 0x404a20b4 0x40528428 <sprintf+0x50>
> #8 0x4046eb68 0x40528500 <inet_ntop4+0x1c>
> #9 0x4046ee90 0x40528570 <inet_ntop+0x2e8>
> #10 0x4046eb3c 0x40528628 <inet_ntoa+0x54>
> #11 0x40474a90 0x40528690 <arplookup+0xb8>
> #12 0x404754c0 0x405286f8 <arpintr+0x1d4>
> #13 0x40434048 0x40528788 <networkDaemon+0xa8>
> #14 0x40433db4 0x405287f0 <taskEntry+0x1c>
> #15 0x40499058 0x40528850 <_Thread_Handler+0xb8>
> #16 0x40498fa0 0x405288b0 <_Thread_Handler+0>
>
> So it would appear that RTEMS is in networking code, calling sprintf,
> trying to perform a floating point operation but for some reason the
> FPU has been disabled.
>
>
>
>
>
> _______________________________________________
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