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ppc: Do not take exceptions on unknown SPRs in privileged mode

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The architecture specifies that mtspr/mfspr on an unknown SPR number
should act as a nop in privileged mode.

I haven't removed the warning however as it can be useful for
diagnosing.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2016-06-07 12:50:28 +10:00 • committed by David Gibson
parent c76c22d51d
commit 4d6a0680fa
1 changed files with 9 additions and 2 deletions
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7
target-ppc/translate.c
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@ -4351,9 +4351,12 @@ static inline void gen_op_mfspr(DisasContext *ctx)
qemu_log("Trying to read invalid spr %d (0x%03x) at "
TARGET_FMT_lx "\n", sprn, sprn, ctx->nip - 4);
}
/* Only generate an exception in user space, otherwise this is a nop */
if (ctx->pr) {
gen_inval_exception(ctx, POWERPC_EXCP_INVAL_SPR);
}
}
}
static void gen_mfspr(DisasContext *ctx)
{
@ -4503,9 +4506,13 @@ static void gen_mtspr(DisasContext *ctx)
}
fprintf(stderr, "Trying to write invalid spr %d (0x%03x) at "
TARGET_FMT_lx "\n", sprn, sprn, ctx->nip - 4);
/* Only generate an exception in user space, otherwise this is a nop */
if (ctx->pr) {
gen_inval_exception(ctx, POWERPC_EXCP_INVAL_SPR);
}
}
}
/*** Cache management ***/