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[PATCH] x86: reject further invalid AVX-512 masking constructs


For one the register type used for masking should be validated. And then
we shouldn't accept input producing encodings which will #UD when
executed, as is the case when EVEX.Z is set while EVEX.AAA is zero.

gas/
2017-11-20  Jan Beulich  <jbeulich@suse.com>

	* config/tc-i386.c (check_VecOperations): Check register type
	for masking. Quote the actual register name in the respective
	diagnostic. Check {z} wasn't specified on its own.
	* testsuite/gas/i386/inval-avx512f.s,
	testsuite/gas/i386/x86-64-inval-avx512f.s: Add further bad
	masking tests.
	* testsuite/gas/i386/inval-avx512f.l,
	testsuite/gas/i386/x86-64-inval-avx512f.l: Adjust expectations.
---
This takes https://sourceware.org/ml/binutils/2017-11/msg00319.html as
a prereq (the new tests being added would otherwise also cause
multiple diagnostics to be issued).

--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -8148,10 +8148,10 @@ check_VecOperations (char *op_string, ch
 	  else if ((mask = parse_register (op_string, &end_op)) != NULL)
 	    {
 	      /* k0 can't be used for write mask.  */
-	      if (mask->reg_num == 0)
+	      if (!mask->reg_type.bitfield.regmask || mask->reg_num == 0)
 		{
 		  as_bad (_("`%s' can't be used for write mask"),
-			  op_string);
+			  mask->reg_name);
 		  return NULL;
 		}
 
@@ -8230,6 +8230,12 @@ check_VecOperations (char *op_string, ch
       return NULL;
     }
 
+  if (i.mask && i.mask->zeroing && !i.mask->mask)
+    {
+      as_bad (_("zeroing-masking only allowed with write mask"));
+      return NULL;
+    }
+
   return op_string;
 }
 
--- a/gas/testsuite/gas/i386/inval-avx512f.l
+++ b/gas/testsuite/gas/i386/inval-avx512f.l
@@ -36,6 +36,8 @@
 .*:48: Error: .*
 .*:49: Error: .*
 .*:50: Error: .*
+.*:52: Error: .*
+.*:53: Error: .*
 GAS LISTING .*
 
 
@@ -89,3 +91,6 @@ GAS LISTING .*
 [ 	]*48[ 	]+vaddps zmm2, zmm1, ZMMWORD PTR \[eax\]\{1to16\}
 [ 	]*49[ 	]+vaddps zmm2, zmm1, DWORD PTR \[eax\]
 [ 	]*50[ 	]+vaddpd zmm2, zmm1, QWORD PTR \[eax\]
+[ 	]*51[ 	]*
+[ 	]*52[ 	]+vaddps zmm2\{ecx\}, zmm1, zmm0
+[ 	]*53[ 	]+vaddps zmm2\{z\}, zmm1, zmm0
--- a/gas/testsuite/gas/i386/inval-avx512f.s
+++ b/gas/testsuite/gas/i386/inval-avx512f.s
@@ -48,3 +48,6 @@ _start:
 	vaddps zmm2, zmm1, ZMMWORD PTR [eax]{1to16}
 	vaddps zmm2, zmm1, DWORD PTR [eax]
 	vaddpd zmm2, zmm1, QWORD PTR [eax]
+
+	vaddps zmm2{ecx}, zmm1, zmm0
+	vaddps zmm2{z}, zmm1, zmm0
--- a/gas/testsuite/gas/i386/x86-64-inval-avx512f.l
+++ b/gas/testsuite/gas/i386/x86-64-inval-avx512f.l
@@ -34,6 +34,8 @@
 .*:46: Error: .*
 .*:47: Error: .*
 .*:48: Error: .*
+.*:50: Error: .*
+.*:51: Error: .*
 GAS LISTING .*
 
 
@@ -85,3 +87,6 @@ GAS LISTING .*
 [ 	]*46[ 	]+vaddps zmm2, zmm1, ZMMWORD PTR \[rax\]\{1to16\}
 [ 	]*47[ 	]+vaddps zmm2, zmm1, DWORD PTR \[rax\]
 [ 	]*48[ 	]+vaddpd zmm2, zmm1, QWORD PTR \[rax\]
+[ 	]*49[ 	]*
+[ 	]*50[ 	]+vaddps zmm2\{rcx\}, zmm1, zmm0
+[ 	]*51[ 	]+vaddps zmm2\{z\}, zmm1, zmm0
--- a/gas/testsuite/gas/i386/x86-64-inval-avx512f.s
+++ b/gas/testsuite/gas/i386/x86-64-inval-avx512f.s
@@ -46,3 +46,6 @@ _start:
 	vaddps zmm2, zmm1, ZMMWORD PTR [rax]{1to16}
 	vaddps zmm2, zmm1, DWORD PTR [rax]
 	vaddpd zmm2, zmm1, QWORD PTR [rax]
+
+	vaddps zmm2{rcx}, zmm1, zmm0
+	vaddps zmm2{z}, zmm1, zmm0




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