[OpenBIOS] Sparc64 OpenBIOS

[Nick Couchman]

> 
> More likely the address given to fetch was not aligned:
> static void fetch(void)
> {
> 	const ucell *aaddr = (ucell *)cell2pointer(POP());
> 	PUSH(read_ucell(aaddr));
> }
> 
> Here QEMU can help, enable DEBUG_PCALL in target-sparc/op_helper.c and
> recompile. Then run QEMU with -d int and /tmp/qemu.log will contain
> the register dump at the time of the exception.

I enabled DEBUG_PCALL as well as DEBUG_UNALIGNED in target-sparc/op_helper.c.  Output for qemu was:

0 > boot cdrom 
[sparc64] Booting file 'cdrom' with parameters ''
Not a bootable ELF image
Not a Linux kernel image
Not a bootable a.out image
Loading FCode image...
Loaded 7420 bytes
entry point is 0x4000
Evaluating FCode...
Unaligned access to 0x0000000000000014 from 0x00000000ffd10d9c
Unhandled Exception 0x0000000000000034
PC = 0x00000000ffd10de4 NPC = 0x00000000ffd10de8
Stopping execution

and /tmp/qemu.log contains this at the end:

Search PC...
  4550: Unaligned Memory Access (v=0034) pc=00000000ffd10de4 npc=00000000ffd10de8 SP=00000000fff10cd1
pc: 00000000ffd10de4  npc: 00000000ffd10de8
General Registers:
%g0: 0000000000000000   %g1: 00000000000000b8   %g2: 0000000000000014   %g3: 00000000ffee3d50   
%g4: 00000000ffee3000   %g5: 0000000000000041   %g6: 0000000000000000   %g7: 0000000000000000   
Current Register Window:
%o0: 000000000000003f   %o1: 00000000ffe130f0   %o2: 0000000000000018   %o3: 00000000ffee3000   
%o4: 00000000ffee3c00   %o5: 0000000000000210   %o6: 00000000fff10cd1   %o7: 00000000ffd0f068   
%l0: 00000000ffee3000   %l1: 0000000000000000   %l2: 00000000ffee3000   %l3: 0000000000000000   
%l4: 000000000000001a   %l5: 0000000000000000   %l6: 0000000000000000   %l7: 0000000000000000   
%i0: 00000000ffe1ac30   %i1: 0000000000000200   %i2: 00000000ffe00000   %i3: 0000000000000000   
%i4: ffffffffffffffff   %i5: 0000000000000018   %i6: 00000000fff10d91   %i7: 00000000ffd126f8   

Floating Point Registers:
%f00: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f04: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f08: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f12: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f16: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f20: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f24: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
%f28: 000000000.000000 000000000.000000 000000000.000000 000000000.000000
pstate: 0x00000016 ccr: 0x44 asi: 0x00 tl: 0 fprs: 0
cansave: 6 canrestore: 0 otherwin: 0 wstate 0 cleanwin 7 cwp 4
fsr: 0x00000000


-Nick



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