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Verify that the lowest 4 bits of the opcode are zero before disassembling.

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According to the docs, opcode 0x6ff4fff0 is gauranteed to generate
a RESINST exception on all implementations, so disassemble it as "illegal".
This commit is contained in:
scw 2002-09-01 09:00:35 +00:00
parent 41ce843fd8
commit 1398cd2898
1 changed files with 7 additions and 3 deletions
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10
sys/arch/sh5/sh5/db_disasm.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_disasm.c,v 1.2 2002/08/31 22:21:39 scw Exp $ */
/* $NetBSD: db_disasm.c,v 1.3 2002/09/01 09:00:35 scw Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@ -724,7 +724,7 @@ static const struct format_mnd0 format_mnd0[][16] = {
{"trapa", FMT_MND0_OP_R, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{"synci", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{"rte", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{NULL, 0},
{"illegal", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{"brk", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{"synco", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
{"sleep", FMT_MND0_OP_NONE, FMT_MND0_OP_NONE, FMT_MND0_OP_NONE},
@ -1099,7 +1099,11 @@ db_disasm(db_addr_t loc, boolean_t dummy)
} else
op = *((opcode_t *)loc);
if ((fp = major_format_funcs[SH5_OPCODE_FORMAT(op)]) != NULL)
/*
* The lowest 4 bits must be zero
*/
if ((op & 0xf) == 0 &&
(fp = major_format_funcs[SH5_OPCODE_FORMAT(op)]) != NULL)
mnemonic = (fp)(op, loc, oper1, oper2, oper3);
else
mnemonic = NULL;