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From: Robert Cragie<rcc@j...>
Date: Mon Aug 23 09:28:30 CEST 2004
Subject: [openrisc] or1ksim basic.S error
You are executing the following:

l.sw 0x0(r1),r2

r1 contains 0xfffffffd, so you are trying to do a word access at a
halfword-aligned address. This will cause an alignment exception.

Robert Cragie, Design Engineer
_______________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT, UK
http://www.jennic.com Tel: +44 (0) 114 281 2655
_______________________________________________________________

> -----Original Message-----
> From: openrisc-bounces@o...
> [mailto:openrisc-bounces@o...]On Behalf Of zhustudio
> Sent: 22 August 2004 04:14
> To: openrisc@o...
> Subject: [openrisc] or1ksim basic.S error
>
>
> hi all,
>
> here is the or1ksim log at the end of program, basic.S
> i saw basic.S call 'report' function
> but when it call report, it execute l.sw 0x0(r1),r2.
>
> it reports
> Exception 0x600 (Alignment) at 0x4000914, EA: 0xfffffffd, ppc:
> 0x4000914, npc: 0x4000918, #568
>
> what's the matter of that ?
>
> i simulate other c program, such as uart, it has no error.
>
> and in support.c
> i find report function is (in no OR1K define section)
> void report(unsigned long value)
> {
> printf("report(0x%x);\n", (unsigned) value);
> }
>
>
> Thank you.
>
> zhustudio
>
>
> 04000910: (_report): 9c21fffc l.addi r1,r1,-4 (next insn)
> GPR00: 00000000 GPR01: 00000001 GPR02: 00000003 GPR03: deaddead
> GPR04: 00000000 GPR05: 00008001 GPR06: ffffffff GPR07: fffffffa
> GPR08: 1243f8b2 GPR09: 040006e4 GPR10: 04000660 GPR11: 000007ff
> GPR12: 00000fff GPR13: 00001fff GPR14: 00003fff GPR15: 00007fff
> GPR16: ffff0012 GPR17: ffff0011 GPR18: ffff8010 GPR19: ffffc00f
> GPR20: ffffe00e GPR21: fffff00d GPR22: fffff80c GPR23: fffffc0b
> GPR24: fffffe0a GPR25: ffffff09 GPR26: ffffff88 GPR27: ffffffc7
> GPR28: ffffffe6 GPR29: fffffff5 GPR30: fffffffc GPR31:
> 00000040 flag: 0
> 04000910: (_report): 9c21fffc l.addi r1,r1,-4 (executed) [time 11520ns,
> #567]
> HAZARDWAIT: 0
> 04000914: : d4011000 l.sw 0x0(r1),r2 (next insn)
> GPR00: 00000000 GPR01: fffffffd GPR02: 00000003 GPR03: deaddead
> GPR04: 00000000 GPR05: 00008001 GPR06: ffffffff GPR07: fffffffa
> GPR08: 1243f8b2 GPR09: 040006e4 GPR10: 04000660 GPR11: 000007ff
> GPR12: 00000fff GPR13: 00001fff GPR14: 00003fff GPR15: 00007fff
> GPR16: ffff0012 GPR17: ffff0011 GPR18: ffff8010 GPR19: ffffc00f
> GPR20: ffffe00e GPR21: fffff00d GPR22: fffff80c GPR23: fffffc0b
> GPR24: fffffe0a GPR25: ffffff09 GPR26: ffffff88 GPR27: ffffffc7
> GPR28: ffffffe6 GPR29: fffffff5 GPR30: fffffffc GPR31:
> 00000040 flag: 0
> ###################################################################
> Exception 0x600 (Alignment) at 0x4000914, EA: 0xfffffffd, ppc:
> 0x4000914, npc: 0x4000918, #568
> ###################################################################
> 04000914: : d4011000 l.sw 0x0(r1),r2 (executed) [time 11540ns, #568]
> HAZARDWAIT: 0
> 04000918: : 9c410004 l.addi r2,r1,0x4 (next insn)
> GPR00: 00000000 GPR01: fffffffd GPR02: 00000003 GPR03: deaddead
> GPR04: 00000000 GPR05: 00008001 GPR06: ffffffff GPR07: fffffffa
> GPR08: 1243f8b2 GPR09: 040006e4 GPR10: 04000660 GPR11: 000007ff
> GPR12: 00000fff GPR13: 00001fff GPR14: 00003fff GPR15: 00007fff
> GPR16: ffff0012 GPR17: ffff0011 GPR18: ffff8010 GPR19: ffffc00f
> GPR20: ffffe00e GPR21: fffff00d GPR22: fffff80c GPR23: fffffc0b
> GPR24: fffffe0a GPR25: ffffff09 GPR26: ffffff88 GPR27: ffffffc7
> GPR28: ffffffe6 GPR29: fffffff5 GPR30: fffffffc GPR31:
> 00000040 flag: 0
> 00000600: : 00000000 l.j 0x0 (executed) [time 11560ns, #569]
> HAZARDWAIT: 0
> 00000604: : 00000000 l.j 0x0 (next insn) (delay insn)
> GPR00: 00000000 GPR01: fffffffd GPR02: 00000003 GPR03: deaddead
> GPR04: 00000000 GPR05: 00008001 GPR06: ffffffff GPR07: fffffffa
> GPR08: 1243f8b2 GPR09: 040006e4 GPR10: 04000660 GPR11: 000007ff
> GPR12: 00000fff GPR13: 00001fff GPR14: 00003fff GPR15: 00007fff
> GPR16: ffff0012 GPR17: ffff0011 GPR18: ffff8010 GPR19: ffffc00f
> GPR20: ffffe00e GPR21: fffff00d GPR22: fffff80c GPR23: fffffc0b
> GPR24: fffffe0a GPR25: ffffff09 GPR26: ffffff88 GPR27: ffffffc7
> GPR28: ffffffe6 GPR29: fffffff5 GPR30: fffffffc GPR31:
> 00000040 flag: 0
> 00000604: : 00000000 l.j 0x0 (executed) [time 11580ns, #570]
> HAZARDWAIT: 0
>

Reference	Author
[openrisc] or1ksim basic.S error	Zhustudio