[ARM] Fix PR85203: cmse_nonsecure_caller returns wrong result

__builtin_cmse_nonsecure_caller implementation returns true in almost
all cases due to 2 separate bugs:

* gen_addsi is used instead of gen_andsi to retrieve the lsb
* the lsb boolean value is not negated but the specification says
  the intrinsic should return true for a nonsecure caller and a
  nonsecure caller is characterized with LR's lsb being 0

This was not caught due to (1) lack of runtime test and (2) the existing
RTL scan not taking into account that '.' matches newline in Tcl regular
expressions.

This commit fixes the implementation issues and improves testing of
cmse_nonsecure_caller by (1) adding a runtime test for the secure caller
case and (2) looking for an SET insn of an AND expression in the right
function. This leaves the nonsecure caller case only partly tested
since the exact value being AND and the negation are not covered by the
scan and the existing test infrastructure does not allow 2 separate
compilation and link to be performed. It is enough though to catch the
current incorrect behavior.

The commit also reorganize the scan directives in cmse-1.c to more
easily identify what function they are intended to test in the file.

2018-04-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

gcc/
    PR target/85203
    * config/arm/arm-builtins.c (arm_expand_builtin): Change
    expansion to perform a bitwise AND of the argument followed by a
    boolean negation of the result.

gcc/testsuite/
    PR target/85203
    * gcc.target/arm/cmse/cmse-1.c: Tighten cmse_nonsecure_caller RTL scan
    to match a single insn of the baz function.  Move scan directives at
    the end of the file below the functions they are trying to test for
    better readability.
    * gcc.target/arm/cmse/cmse-16.c: New testcase.

From-SVN: r259097

5 files changed, 56 insertions, 10 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bce1b28..e090230 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-04-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	PR target/85203
+	* config/arm/arm-builtins.c (arm_expand_builtin): Change
+	expansion to perform a bitwise AND of the argument followed by a
+	boolean negation of the result.
+
 2018-04-04  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR rtl-optimization/84878
diff --git a/gcc/config/arm/arm-builtins.c b/gcc/config/arm/arm-builtins.c
index 8940d1f6..184eb2a 100644
--- a/gcc/config/arm/arm-builtins.c
+++ b/gcc/config/arm/arm-builtins.c
@@ -2600,7 +2600,9 @@ arm_expand_builtin (tree exp,
     case ARM_BUILTIN_CMSE_NONSECURE_CALLER:
       target = gen_reg_rtx (SImode);
       op0 = arm_return_addr (0, NULL_RTX);
-      emit_insn (gen_addsi3 (target, op0, const1_rtx));
+      emit_insn (gen_andsi3 (target, op0, const1_rtx));
+      op1 = gen_rtx_EQ (SImode, target, const0_rtx);
+      emit_insn (gen_cstoresi4 (target, op1, target, const0_rtx));
       return target;
 
     case ARM_BUILTIN_TEXTRMSB:
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 51f5329..ef7e772 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2018-04-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	PR target/85203
+	* gcc.target/arm/cmse/cmse-1.c: Tighten cmse_nonsecure_caller RTL scan
+	to match a single insn of the baz function.  Move scan directives at
+	the end of the file below the functions they are trying to test for
+	better readability.
+	* gcc.target/arm/cmse/cmse-16.c: New testcase.
+
 2018-04-04  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR rtl-optimization/84878
diff --git a/gcc/testsuite/gcc.target/arm/cmse/cmse-1.c b/gcc/testsuite/gcc.target/arm/cmse/cmse-1.c
index c13272e..f764153 100644
--- a/gcc/testsuite/gcc.target/arm/cmse/cmse-1.c
+++ b/gcc/testsuite/gcc.target/arm/cmse/cmse-1.c
@@ -71,6 +71,20 @@ baz (void)
 {
   return cmse_nonsecure_caller ();
 }
+/* { dg-final { scan-assembler "baz:" } } */
+/* { dg-final { scan-assembler "__acle_se_baz:" } } */
+/* { dg-final { scan-assembler-not "\tcmse_nonsecure_caller" } } */
+/* Look for an andsi of 1 with a register in function baz, ie.
+
+;; Function baz<anything>
+<any line without '('>
+(insn <anything but '('> (set (reg<any register modifier>:SI <anything but ')'>)
+     (and:SI (reg<any register modifier>:SI <anything but ')'>)
+	     (const_int 1 <anything but ')'>)<anything but '('>
+   <optional: (nil)<anything but '('>>
+(insn
+*/
+/* { dg-final { scan-rtl-dump "\n;; Function baz\[^\n\]*\[^(\]+\[^;\]*\n\\(insn \[^(\]+ \\(set \\(reg\[^:\]*:SI \[^)\]+\\)\[^(\]*\\(and:SI \\(reg\[^:\]*:SI \[^)\]+\\)\[^(\]*\\((const_int 1|reg\[^:\]*:SI) \[^)\]+\\)\[^(\]+(\\(nil\\)\[^(\]+)?\\(insn" expand } } */
 
 typedef int __attribute__ ((cmse_nonsecure_call)) (int_nsfunc_t) (void);
 
@@ -86,6 +100,11 @@ qux (int_nsfunc_t * callback)
 {
   fp = cmse_nsfptr_create (callback);
 }
+/* { dg-final { scan-assembler "qux:" } } */
+/* { dg-final { scan-assembler "__acle_se_qux:" } } */
+/* { dg-final { scan-assembler "bic" } } */
+/* { dg-final { scan-assembler "push\t\{r4, r5, r6" } } */
+/* { dg-final { scan-assembler "msr\tAPSR_nzcvq" } } */
 
 int call_callback (void)
 {
@@ -94,13 +113,4 @@ int call_callback (void)
   else
     return default_callback ();
 }
-/* { dg-final { scan-assembler "baz:" } } */
-/* { dg-final { scan-assembler "__acle_se_baz:" } } */
-/* { dg-final { scan-assembler "qux:" } } */
-/* { dg-final { scan-assembler "__acle_se_qux:" } } */
-/* { dg-final { scan-assembler-not "\tcmse_nonsecure_caller" } } */
-/* { dg-final { scan-rtl-dump "and.*reg.*const_int 1" expand } } */
-/* { dg-final { scan-assembler "bic" } } */
-/* { dg-final { scan-assembler "push\t\{r4, r5, r6" } } */
-/* { dg-final { scan-assembler "msr\tAPSR_nzcvq" } } */
 /* { dg-final { scan-assembler-times "bl\\s+__gnu_cmse_nonsecure_call" 1 } } */
diff --git a/gcc/testsuite/gcc.target/arm/cmse/cmse-16.c b/gcc/testsuite/gcc.target/arm/cmse/cmse-16.c
new file mode 100644
index 0000000..3fb0380
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/cmse/cmse-16.c
@@ -0,0 +1,18 @@
+/* { dg-do run } */
+/* { dg-options "-Os -mcmse" }  */
+
+#include <arm_cmse.h>
+
+int
+foo (void)
+{
+  return cmse_nonsecure_caller ();
+}
+
+int
+main (void)
+{
+  /* Return success (0) if main is secure, ie if cmse_nonsecure_caller/foo
+     returns false (0).  */
+  return foo ();
+}