[PATCH 2/6] aarch64: Add missing ACLE support for PAC-RET

[Szabolcs Nagy]

Define the __ARM_FEATURE_PAC_DEFAULT feature test
macro when PAC-RET branch protection is enabled.

gcc/ChangeLog:

2020-07-08  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Add
	__ARM_FEATURE_PAC_DEFAULT support.

---
Note: i expect to push this patch after the pac-ret
__builtin_return_address and unwinder patches are
resolved so we only advertise pac-ret support in a
fixed gcc which makes it possible to configure test
for __builtin_return_address behaviour.
---
 gcc/config/aarch64/aarch64-c.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gcc/config/aarch64/aarch64-c.c b/gcc/config/aarch64/aarch64-c.c
index 1882288af8d..1a1f4ecef04 100644
--- a/gcc/config/aarch64/aarch64-c.c
+++ b/gcc/config/aarch64/aarch64-c.c
@@ -181,6 +181,19 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
   aarch64_def_or_undef (aarch64_bti_enabled (),
 			"__ARM_FEATURE_BTI_DEFAULT", pfile);
 
+  cpp_undef (pfile, "__ARM_FEATURE_PAC_DEFAULT");
+  if (aarch64_ra_sign_scope != AARCH64_FUNCTION_NONE)
+    {
+      int v = 0;
+      if (aarch64_ra_sign_key == AARCH64_KEY_A)
+	v |= 1;
+      if (aarch64_ra_sign_key == AARCH64_KEY_B)
+	v |= 2;
+      if (aarch64_ra_sign_scope == AARCH64_FUNCTION_ALL)
+	v |= 4;
+      builtin_define_with_int_value ("__ARM_FEATURE_PAC_DEFAULT", v);
+    }
+
   aarch64_def_or_undef (TARGET_I8MM, "__ARM_FEATURE_MATMUL_INT8", pfile);
   aarch64_def_or_undef (TARGET_BF16_SIMD,
 			"__ARM_FEATURE_BF16_VECTOR_ARITHMETIC", pfile);
-- 
2.17.1