ubsan: aarch64: left shift cannot be represented in type 'int64_t'

	* aarch64-opc.c (value_fit_signed_field_p): Avoid signed overflow.
	(value_fit_unsigned_field_p): Likewise.
	(aarch64_wide_constant_p): Likewise.
	(operand_general_constraint_met_p): Likewise.
	* aarch64-opc.h (aarch64_wide_constant_p): Update prototype.

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 1e9945ee8d73ae852986fdde6a92860a883c9eb2..e2aa20b5e80bdc76b069b3309fc1e54d3dbca9d4 100644 (file)
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,11 @@
+2019-12-17  Alan Modra  <amodra@gmail.com>
+
+       * aarch64-opc.c (value_fit_signed_field_p): Avoid signed overflow.
+       (value_fit_unsigned_field_p): Likewise.
+       (aarch64_wide_constant_p): Likewise.
+       (operand_general_constraint_met_p): Likewise.
+       * aarch64-opc.h (aarch64_wide_constant_p): Update prototype.
+
 2019-12-17  Alan Modra  <amodra@gmail.com>
 
        * nds32-dis.c (nds32_mask_opcode): Avoid signed overflow.

diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index 61547b403df47a3d23361019799b00e285290969..25665137761e7d114d87a8d8ab871b3608004327 100644 (file)
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -546,7 +546,7 @@ value_fit_signed_field_p (int64_t value, unsigned width)
   assert (width < 32);
   if (width < sizeof (value) * 8)
     {
-      int64_t lim = (int64_t)1 << (width - 1);
+      int64_t lim = (uint64_t) 1 << (width - 1);
       if (value >= -lim && value < lim)
        return 1;
     }
@@ -560,7 +560,7 @@ value_fit_unsigned_field_p (int64_t value, unsigned width)
   assert (width < 32);
   if (width < sizeof (value) * 8)
     {
-      int64_t lim = (int64_t)1 << width;
+      int64_t lim = (uint64_t) 1 << width;
       if (value >= 0 && value < lim)
        return 1;
     }
@@ -1063,7 +1063,7 @@ match_operands_qualifier (aarch64_inst *inst, bfd_boolean update_p)
    amount will be returned in *SHIFT_AMOUNT.  */
 
 bfd_boolean
-aarch64_wide_constant_p (int64_t value, int is32, unsigned int *shift_amount)
+aarch64_wide_constant_p (uint64_t value, int is32, unsigned int *shift_amount)
 {
   int amount;
 
@@ -1074,22 +1074,21 @@ aarch64_wide_constant_p (int64_t value, int is32, unsigned int *shift_amount)
       /* Allow all zeros or all ones in top 32-bits, so that
         32-bit constant expressions like ~0x80000000 are
         permitted.  */
-      uint64_t ext = value;
-      if (ext >> 32 != 0 && ext >> 32 != (uint64_t) 0xffffffff)
+      if (value >> 32 != 0 && value >> 32 != 0xffffffff)
        /* Immediate out of range.  */
        return FALSE;
-      value &= (int64_t) 0xffffffff;
+      value &= 0xffffffff;
     }
 
   /* first, try movz then movn */
   amount = -1;
-  if ((value & ((int64_t) 0xffff << 0)) == value)
+  if ((value & ((uint64_t) 0xffff << 0)) == value)
     amount = 0;
-  else if ((value & ((int64_t) 0xffff << 16)) == value)
+  else if ((value & ((uint64_t) 0xffff << 16)) == value)
     amount = 16;
-  else if (!is32 && (value & ((int64_t) 0xffff << 32)) == value)
+  else if (!is32 && (value & ((uint64_t) 0xffff << 32)) == value)
     amount = 32;
-  else if (!is32 && (value & ((int64_t) 0xffff << 48)) == value)
+  else if (!is32 && (value & ((uint64_t) 0xffff << 48)) == value)
     amount = 48;
 
   if (amount == -1)
@@ -1535,7 +1534,7 @@ operand_general_constraint_met_p (const aarch64_opnd_info *opnds, int idx,
                               : _("z0-z7 expected"));
              return 0;
            }
-         mask = (1 << (size - shift)) - 1;
+         mask = (1u << (size - shift)) - 1;
          if (!value_in_range_p (opnd->reglane.index, 0, mask))
            {
              set_elem_idx_out_of_range_error (mismatch_detail, idx, 0, mask);
@@ -2161,7 +2160,7 @@ operand_general_constraint_met_p (const aarch64_opnd_info *opnds, int idx,
          if (!value_fit_unsigned_field_p (opnd->imm.value, size))
            {
              set_imm_out_of_range_error (mismatch_detail, idx, 0,
-                                         (1 << size) - 1);
+                                         (1u << size) - 1);
              return 0;
            }
          break;

diff --git a/opcodes/aarch64-opc.h b/opcodes/aarch64-opc.h
index bb0a50892b24eeacf854bf9060bfd43a2a52f5e1..e0d4f5bae259c1495a995c0d62dfaec18f31db8c 100644 (file)
--- a/opcodes/aarch64-opc.h
+++ b/opcodes/aarch64-opc.h
@@ -485,7 +485,7 @@ enum aarch64_modifier_kind
 aarch64_get_operand_modifier_from_value (aarch64_insn, bfd_boolean);
 
 
-bfd_boolean aarch64_wide_constant_p (int64_t, int, unsigned int *);
+bfd_boolean aarch64_wide_constant_p (uint64_t, int, unsigned int *);
 bfd_boolean aarch64_logical_immediate_p (uint64_t, int, aarch64_insn *);
 int aarch64_shrink_expanded_imm8 (uint64_t);