[PATCH 2/2] Hexagon (decode): look for pkts with multiple insns at the same slot

[Matheus Tavares Bernardino]

Each slot in a packet can be assigned to at most one instruction.
Although the assembler generally ought to enforce this rule, we better
be safe than sorry and also do some check to properly throw an "invalid
packet" exception on wrong slot assignments.

This should also make it easier to debug possible future errors caused
by missing updates to `find_iclass_slots()` rules in
target/hexagon/iclass.c.

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
---
 target/hexagon/decode.c           | 30 +++++++++++++++++++++++++++---
 tests/tcg/hexagon/Makefile.target | 10 ++++++++++
 tests/tcg/hexagon/invalid_slots.c | 29 +++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 3 deletions(-)
 create mode 100644 tests/tcg/hexagon/invalid_slots.c

diff --git a/target/hexagon/decode.c b/target/hexagon/decode.c
index 041c8de751..65ebf516a5 100644
--- a/target/hexagon/decode.c
+++ b/target/hexagon/decode.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights 
Reserved.
+ *  Copyright(c) 2019-2023 Qualcomm Innovation Center, Inc. All Rights 
Reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -797,7 +797,26 @@ static bool decode_parsebits_is_loopend(uint32_t 
encoding32)
     return bits == 0x2;
 }
 
-static void
+static bool has_valid_slot_assignment(Packet *pkt)
+{
+    int used_slots = 0;
+    for (int i = 0; i < pkt->num_insns; i++) {
+        int slot_mask;
+        Insn *insn = &pkt->insn[i];
+        if (decode_opcode_ends_loop(insn->opcode)) {
+            /* We overload slot 0 for endloop. */
+            continue;
+        }
+        slot_mask = 1 << insn->slot;
+        if (used_slots & slot_mask) {
+            return false;
+        }
+        used_slots |= slot_mask;
+    }
+    return true;
+}
+
+static bool
 decode_set_slot_number(Packet *pkt)
 {
     int slot;
@@ -886,6 +905,8 @@ decode_set_slot_number(Packet *pkt)
         /* Then push it to slot0 */
         pkt->insn[slot1_iidx].slot = 0;
     }
+
+    return has_valid_slot_assignment(pkt);
 }
 
 /*
@@ -962,7 +983,10 @@ int decode_packet(int max_words, const uint32_t *words, 
Packet *pkt,
     if (!disas_only) {
         decode_remove_extenders(pkt);
     }
-    decode_set_slot_number(pkt);
+    if (!decode_set_slot_number(pkt)) {
+        /* Invalid packet */
+        return 0;
+    }
     decode_fill_newvalue_regno(pkt);
 
     if (pkt->pkt_has_hvx) {
diff --git a/tests/tcg/hexagon/Makefile.target 
b/tests/tcg/hexagon/Makefile.target
index 18e6a5969e..062aef63c3 100644
--- a/tests/tcg/hexagon/Makefile.target
+++ b/tests/tcg/hexagon/Makefile.target
@@ -45,6 +45,16 @@ HEX_TESTS += fpstuff
 HEX_TESTS += overflow
 HEX_TESTS += signal_context
 HEX_TESTS += reg_mut
+HEX_TESTS += invalid_slots
+
+run-invalid_slots:
+       $(call run-test, $<, $(QEMU) $< 2> $<.stderr, $<); \
+       if [ $$? -ne 1 ] ; then \
+               return 1; \
+       fi
+       $(call quiet-command, \
+               grep -q "exception 0x15" $<.stderr, \
+               "GREP", "exception 0x15");
 
 HEX_TESTS += test_abs
 HEX_TESTS += test_bitcnt
diff --git a/tests/tcg/hexagon/invalid_slots.c 
b/tests/tcg/hexagon/invalid_slots.c
new file mode 100644
index 0000000000..366ce4f42f
--- /dev/null
+++ b/tests/tcg/hexagon/invalid_slots.c
@@ -0,0 +1,29 @@
+/*
+ *  Copyright(c) 2023 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+char mem[8] __attribute__((aligned(8)));
+
+int main()
+{
+    asm volatile(
+        "r0 = #mem\n"
+        /* Invalid packet (2 instructions at slot 0): */
+        ".word 0xa1804100\n" /* { memw(r0) = r1;      */
+        ".word 0x28032804\n" /*   r3 = #0; r4 = #0 }  */
+        : : : "r0", "r3", "r4", "memory");
+    return 0;
+}
-- 
2.37.2