Date: Mon, 28 May 2001 16:12:48 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: mjacob@feral.com Cc: "Daniel C. Sobral" <dcs@newsguy.com>, alpha@FreeBSD.ORG Subject: Re: Latest on ' HEADS UP: loader broken' Message-ID: <15122.45376.304502.55208@grasshopper.cs.duke.edu> In-Reply-To: <15122.40785.294428.276049@grasshopper.cs.duke.edu> References: <15122.40043.23892.164757@grasshopper.cs.duke.edu> <Pine.LNX.4.21.0105281147010.23428-100000@zeppo.feral.com> <15122.40785.294428.276049@grasshopper.cs.duke.edu>
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Well, whatever firmware I'm running on the AS500 has a rather nice
feature -- it seems to have a trap handler installed for unaligned
access traps.
FreeBSD/alpha SRM disk boot, Revision 1.1
(gallatin@thunder.cs.duke.edu, Mon May 28 10:56:51 EDT 2001)
Memory: 131072 k
\
fatal kernel trap:
trap entry = 0x4 (unaligned access fault)
a0 = 0x2003d9bc
a1 = 0x2d
a2 = 0x0
pc = 0x200285c4
ra = 0x200285b8
curproc = 0xfffffe0008577cc0
halted CPU 0
If the PC can be trusted, it is somewhere inside of twoConstParen
% nm -n loader.sym
<....>
0000000020026540 T ficlCompileSoftCore
0000000020026960 T ficlParseNumber
00000000200276a0 T constantParen
0000000020027720 T twoConstParen
00000000200290c0 T parseStepParen
000000002002ad20 T ficlTick
000000002002f100 T ficlWordClassify
<....>
(gdb) l *0x200285c4
0x200285c4 is in store (words.c:990).
985 CELL *pCell;
986 #if FICL_ROBUST > 1
987 vmCheckStack(pVM, 2, 0);
988 #endif
989 pCell = (CELL *)stackPopPtr(pVM->pStack);
990 *pCell = stackPop(pVM->pStack);
991 }
992
993 /*
994 ** two-store CORE ( x1 x2 a-addr -- )
Drew
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