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target/mips: Fix RDHWR CC with icount 

RDHWR CC reads the CPU timer like MFC0 CP0_Count, so with icount enabled
it must set can_do_io while it calls the helper to avoid the "Bad icount
read" error. It should also break out of the translation loop to ensure
that timer interrupts are immediately handled.

Fixes: 2e70f6efa8 ("Add instruction counter.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Yongbok Kim <yongbok.kim@imgtec.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
This commit is contained in:
James Hogan 2017-08-02 10:59:17 +01:00 committed by Yongbok Kim
parent 51ca717b07
commit d673a68db6
1 changed files with 11 additions and 0 deletions
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11
target/mips/translate.c
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@ -10755,8 +10755,19 @@ static void gen_rdhwr(DisasContext *ctx, int rt, int rd, int sel)
gen_store_gpr(t0, rt);
break;
case 2:
if (ctx->tb->cflags & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_rdhwr_cc(t0, cpu_env);
if (ctx->tb->cflags & CF_USE_ICOUNT) {
gen_io_end();
}
gen_store_gpr(t0, rt);
/* Break the TB to be able to take timer interrupts immediately
after reading count. BS_STOP isn't sufficient, we need to ensure
we break completely out of translated code. */
gen_save_pc(ctx->pc + 4);
ctx->bstate = BS_EXCP;
break;
case 3:
gen_helper_rdhwr_ccres(t0, cpu_env);