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authorAlexander Graf <agraf@suse.de>2013-12-23 23:27:30 +0000
committerPeter Maydell <peter.maydell@linaro.org>2013-12-23 23:27:30 +0000
commit9618e80938d38eeee765dd23fc0b7475ae536e77 (patch)
treeb24e9f47581dcbcf665384ccf0e7e6ab8e999e9d
parent52c8b9afcd019df799f5eb779395b46a610348b8 (diff)
downloadqemu-arm-9618e80938d38eeee765dd23fc0b7475ae536e77.tar.gz
target-arm: A64: implement SVC, BRK
Add decoding for the exception generating instructions, and implement SVC (syscalls) and BRK (software breakpoint). Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
-rw-r--r--target-arm/translate-a64.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 3a9ffdf71a..9ca6460325 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -808,10 +808,57 @@ static void disas_system(DisasContext *s, uint32_t insn)
}
}
-/* Exception generation */
+/* C3.2.3 Exception generation
+ *
+ * 31 24 23 21 20 5 4 2 1 0
+ * +-----------------+-----+------------------------+-----+----+
+ * | 1 1 0 1 0 1 0 0 | opc | imm16 | op2 | LL |
+ * +-----------------------+------------------------+----------+
+ */
static void disas_exc(DisasContext *s, uint32_t insn)
{
- unsupported_encoding(s, insn);
+ int opc = extract32(insn, 21, 3);
+ int op2_ll = extract32(insn, 0, 5);
+
+ switch (opc) {
+ case 0:
+ /* SVC, HVC, SMC; since we don't support the Virtualization
+ * or TrustZone extensions these all UNDEF except SVC.
+ */
+ if (op2_ll != 1) {
+ unallocated_encoding(s);
+ break;
+ }
+ gen_exception_insn(s, 0, EXCP_SWI);
+ break;
+ case 1:
+ if (op2_ll != 0) {
+ unallocated_encoding(s);
+ break;
+ }
+ /* BRK */
+ gen_exception_insn(s, 0, EXCP_BKPT);
+ break;
+ case 2:
+ if (op2_ll != 0) {
+ unallocated_encoding(s);
+ break;
+ }
+ /* HLT */
+ unsupported_encoding(s, insn);
+ break;
+ case 5:
+ if (op2_ll < 1 || op2_ll > 3) {
+ unallocated_encoding(s);
+ break;
+ }
+ /* DCPS1, DCPS2, DCPS3 */
+ unsupported_encoding(s, insn);
+ break;
+ default:
+ unallocated_encoding(s);
+ break;
+ }
}
/* C3.2.7 Unconditional branch (register)