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target-arm/translate.c: Fix slightly misleading comment in Thumb decoder 

Clarify some slightly misleading comments in the Thumb decoder's
handling of the memory hint space -- in particular one code path
marked as 'UNPREDICTABLE or unallocated hint' also includes some
legitimate preload instructions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
This commit is contained in:
Peter Maydell 2011-11-24 19:33:31 +01:00 committed by Andrzej Zaborowski
parent 4abc7ebf5f
commit 02afbf6475
1 changed files with 5 additions and 3 deletions
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8
target-arm/translate.c
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@ -9025,14 +9025,16 @@ static int disas_thumb2_insn(CPUState *env, DisasContext *s, uint16_t insn_hw1)
goto illegal_op;
}
if (rn == 15) {
/* UNPREDICTABLE or unallocated hint */
/* UNPREDICTABLE, unallocated hint or
* PLD/PLDW/PLI (literal)
*/
return 0;
}
if (op1 & 1) {
return 0; /* PLD* or unallocated hint */
return 0; /* PLD/PLDW/PLI or unallocated hint */
}
if ((op2 == 0) || ((op2 & 0x3c) == 0x30)) {
return 0; /* PLD* or unallocated hint */
return 0; /* PLD/PLDW/PLI or unallocated hint */
}
/* UNDEF space, or an UNPREDICTABLE */
return 1;