Hexagon (target/hexagon) fix bug in circular addressing

Versions V3 and earlier should treat the "K_const" and "length" values
as unsigned.

Modified circ_test_v3() in tests/tcg/hexagon/circ.c to reproduce the bug

Signed-off-by: Michael Lambert <mlambert@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20220210021556.9217-2-tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

target/hexagon/op_helper.c

@@ -1,5 +1,5 @@
 /*
- *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *  Copyright(c) 2019-2022 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
@@ -304,8 +304,8 @@ void HELPER(debug_commit_end)(CPUHexagonState *env, int has_st0, int has_st1)
 
 int32_t HELPER(fcircadd)(int32_t RxV, int32_t offset, int32_t M, int32_t CS)
 {
-    int32_t K_const = sextract32(M, 24, 4);
-    int32_t length = sextract32(M, 0, 17);
+    uint32_t K_const = extract32(M, 24, 4);
+    uint32_t length = extract32(M, 0, 17);
     uint32_t new_ptr = RxV + offset;
     uint32_t start_addr;
     uint32_t end_addr;

tests/tcg/hexagon/circ.c

@@ -1,5 +1,5 @@
 /*
- *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *  Copyright(c) 2019-2022 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
@@ -415,7 +415,8 @@ static void circ_test_v3(void)
 {
     int *p = wbuf;
     int size = 15;
-    int K = 4;      /* 64 bytes */
+    /* set high bit in K to test unsigned extract in fcirc */
+    int K = 8;      /* 1024 bytes */
     int element;
     int i;