x86-64/Intel: issue diagnostic for out of range displacement

... rather than silently dropping it altogether.
i386_finalize_displacement() expects baseindex to already be set, so
the respective statement needs to be moved up. This then also allows a
subsequent conditional to be simplified.

For this to not regress on 32-bit addressing, break out address size
guessing from i386_index_check(), invoking the new function earlier so
that i386_finalize_displacement() has i.prefix[ADDR_PREFIX] available.
i386_addressing_mode () in turn needs i.base_reg / i.index_reg set
earlier.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 7a5808d..2c63aaa 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,14 @@
+2017-11-13  Jan Beulich  <jbeulich@suse.com>
+
+       * config/tc-i386.c (i386_index_check): Break out ...
+       (i386_addressing_mode): ... this new function.
+       * config/tc-i386-intel.c (i386_intel_operand): Do base/index
+       swapping and the setting of .baseindex earlier. Call
+       i386_addressing_mode.
+       * testsuite/gas/i386/x86-64-inval.s: Add out of range
+       displacement case.
+       * testsuite/gas/i386/x86-64-inval.l: Adjust expectations.
+
 2017-11-09  Jim Wilson  <jimw@sifive.com>
 
        * testsuite/gas/elf/dwarf2-10.l: Accept optional line number in error.

diff --git a/gas/config/tc-i386-intel.c b/gas/config/tc-i386-intel.c
index 9e8135e..36ae818 100644 (file)
--- a/gas/config/tc-i386-intel.c
+++ b/gas/config/tc-i386-intel.c
@@ -876,18 +876,41 @@ i386_intel_operand (char *operand_string, int got_a_float)
          return 0;
        }
 
+      /* Swap base and index in 16-bit memory operands like
+        [si+bx]. Since i386_index_check is also used in AT&T
+        mode we have to do this here.  */
+      if (intel_state.base
+         && intel_state.index
+         && intel_state.base->reg_type.bitfield.reg16
+         && intel_state.index->reg_type.bitfield.reg16
+         && intel_state.base->reg_num >= 6
+         && intel_state.index->reg_num < 6)
+       {
+         i.base_reg = intel_state.index;
+         i.index_reg = intel_state.base;
+       }
+      else
+       {
+         i.base_reg = intel_state.base;
+         i.index_reg = intel_state.index;
+       }
+
+      if (i.base_reg || i.index_reg)
+       i.types[this_operand].bitfield.baseindex = 1;
+
       expP = &disp_expressions[i.disp_operands];
       memcpy (expP, &exp, sizeof(exp));
       resolve_expression (expP);
 
       if (expP->X_op != O_constant
          || expP->X_add_number
-         || (!intel_state.base
-             && !intel_state.index))
+         || !i.types[this_operand].bitfield.baseindex)
        {
          i.op[this_operand].disps = expP;
          i.disp_operands++;
 
+         i386_addressing_mode ();
+
          if (flag_code == CODE_64BIT)
            {
              i.types[this_operand].bitfield.disp32 = 1;
@@ -927,9 +950,6 @@ i386_intel_operand (char *operand_string, int got_a_float)
            return 0;
        }
 
-      if (intel_state.base || intel_state.index)
-       i.types[this_operand].bitfield.baseindex = 1;
-
       if (intel_state.seg)
        {
          expP = symbol_get_value_expression (intel_state.seg);
@@ -956,25 +976,6 @@ i386_intel_operand (char *operand_string, int got_a_float)
            }
        }
 
-      /* Swap base and index in 16-bit memory operands like
-        [si+bx]. Since i386_index_check is also used in AT&T
-        mode we have to do that here.  */
-      if (intel_state.base
-         && intel_state.index
-         && intel_state.base->reg_type.bitfield.reg16
-         && intel_state.index->reg_type.bitfield.reg16
-         && intel_state.base->reg_num >= 6
-         && intel_state.index->reg_num < 6)
-       {
-         i.base_reg = intel_state.index;
-         i.index_reg = intel_state.base;
-       }
-      else
-       {
-         i.base_reg = intel_state.base;
-         i.index_reg = intel_state.index;
-       }
-
       if (!i386_index_check (operand_string))
        return 0;
 

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index dcc70c8..4161c8c 100644 (file)
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -8633,13 +8633,13 @@ i386_finalize_displacement (segT exp_seg ATTRIBUTE_UNUSED, expressionS *exp,
   return ret;
 }
 
-/* Make sure the memory operand we've been dealt is valid.
-   Return 1 on success, 0 on a failure.  */
+/* Return the active addressing mode, taking address override and
+   registers forming the address into consideration.  Update the
+   address override prefix if necessary.  */
 
-static int
-i386_index_check (const char *operand_string)
+static enum flag_code
+i386_addressing_mode (void)
 {
-  const char *kind = "base/index";
   enum flag_code addr_mode;
 
   if (i.prefix[ADDR_PREFIX])
@@ -8688,6 +8688,18 @@ i386_index_check (const char *operand_string)
 #endif
     }
 
+  return addr_mode;
+}
+
+/* Make sure the memory operand we've been dealt is valid.
+   Return 1 on success, 0 on a failure.  */
+
+static int
+i386_index_check (const char *operand_string)
+{
+  const char *kind = "base/index";
+  enum flag_code addr_mode = i386_addressing_mode ();
+
   if (current_templates->start->opcode_modifier.isstring
       && !current_templates->start->opcode_modifier.immext
       && (current_templates->end[-1].opcode_modifier.isstring

diff --git a/gas/testsuite/gas/i386/x86-64-inval.l b/gas/testsuite/gas/i386/x86-64-inval.l
index ad460c2..099cc62 100644 (file)
--- a/gas/testsuite/gas/i386/x86-64-inval.l
+++ b/gas/testsuite/gas/i386/x86-64-inval.l
@@ -109,6 +109,7 @@
 .*:115: Error: .*
 .*:116: Error: .*
 .*:117: Error: .*
+.*:118: Error: .*
 GAS LISTING .*
 
 
@@ -235,3 +236,4 @@ GAS LISTING .*
 [      ]*115[  ]+jmpd \[r8\]   \# 32-bit data size not allowed
 [      ]*116[  ]+jmpd \[rax\]  \# 32-bit data size not allowed
 [      ]*117[  ]+jmpq \[ax\]   \# no 16-bit addressing
+[      ]*[1-9][0-9]*[  ]+mov eax,\[rax\+0x876543210\] \# out of range displacement

diff --git a/gas/testsuite/gas/i386/x86-64-inval.s b/gas/testsuite/gas/i386/x86-64-inval.s
index 2c2f5db..1ce8320 100644 (file)
--- a/gas/testsuite/gas/i386/x86-64-inval.s
+++ b/gas/testsuite/gas/i386/x86-64-inval.s
@@ -115,3 +115,4 @@ movnti word ptr [rax], ax
        jmpd [r8]       # 32-bit data size not allowed
        jmpd [rax]      # 32-bit data size not allowed
        jmpq [ax]       # no 16-bit addressing
+       mov eax,[rax+0x876543210] # out of range displacement