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target-arm: Treat UNPREDICTABLE VTBL, VTBX case as UNDEF

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Catch the UNPREDICTABLE case for Neon VTBL,VTBX, and UNDEF it
rather than allowing the helper function to index off the end
of the register file.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-04-11 16:26:22 +01:00 committed by Aurelien Jarno
parent fc2a9b3784
commit 56907d776e
1 changed files with 8 additions and 1 deletions
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9
target-arm/translate.c
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@ -6023,7 +6023,14 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
}
} else if ((insn & (1 << 10)) == 0) {
/* VTBL, VTBX. */
int n = ((insn >> 5) & 0x18) + 8;
int n = ((insn >> 8) & 3) + 1;
if ((rn + n) > 32) {
/* This is UNPREDICTABLE; we choose to UNDEF to avoid the
* helper function running off the end of the register file.
*/
return 1;
}
n <<= 3;
if (insn & (1 << 6)) {
tmp = neon_load_reg(rd, 0);
} else {