[PATCH v2] LoongArch: gas: Add support for s9 register

[PATCH v2] LoongArch: gas: Add support for s9 register

[mengqinggang]

In LoongArch ABI, r22 register can be used as frame pointer or
static register(s9).

Link: https://github.com/loongson/la-abi-specs/blob/release/lapcs.adoc#general-purpose-registers
---

[v1] -> [v2]:
- Add a test.

 gas/config/tc-loongarch.c                 | 7 +++++--
 gas/testsuite/gas/loongarch/loongarch.exp | 1 +
 gas/testsuite/gas/loongarch/reg-s9.l      | 1 +
 gas/testsuite/gas/loongarch/reg-s9.s      | 2 ++
 include/opcode/loongarch.h                | 1 +
 opcodes/loongarch-opc.c                   | 9 +++++++++
 6 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 gas/testsuite/gas/loongarch/reg-s9.l
 create mode 100644 gas/testsuite/gas/loongarch/reg-s9.s

diff --git a/gas/config/tc-loongarch.c b/gas/config/tc-loongarch.c
index e6a9901673f..e0aff36bbbb 100644
--- a/gas/config/tc-loongarch.c
+++ b/gas/config/tc-loongarch.c
@@ -316,8 +316,11 @@ loongarch_after_parse_args ()
   /* Init ilp32/lp64 registers alias.  */
   r_abi_names = loongarch_r_alias;
   for (i = 0; i < ARRAY_SIZE (loongarch_r_alias); i++)
-    str_hash_insert (r_htab, loongarch_r_alias[i], (void *) (i + 1),
-	0);
+    str_hash_insert (r_htab, loongarch_r_alias[i], (void *) (i + 1), 0);
+
+  for (i = 0; i < ARRAY_SIZE (loongarch_r_alias_1); i++)
+    str_hash_insert (r_htab, loongarch_r_alias_1[i], (void *) (i + 1), 0);
+
   for (i = 0; i < ARRAY_SIZE (loongarch_r_alias_deprecated); i++)
     str_hash_insert (r_deprecated_htab, loongarch_r_alias_deprecated[i],
 	(void *) (i + 1), 0);
diff --git a/gas/testsuite/gas/loongarch/loongarch.exp b/gas/testsuite/gas/loongarch/loongarch.exp
index 9ece4e810ff..422b858917e 100644
--- a/gas/testsuite/gas/loongarch/loongarch.exp
+++ b/gas/testsuite/gas/loongarch/loongarch.exp
@@ -31,4 +31,5 @@ if [istarget loongarch*-*-*] {
     }
 
   run_list_test "align"
+  run_list_test "reg-s9"
 }
diff --git a/gas/testsuite/gas/loongarch/reg-s9.l b/gas/testsuite/gas/loongarch/reg-s9.l
new file mode 100644
index 00000000000..8ea739b7641
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/reg-s9.l
@@ -0,0 +1 @@
+# No warning or error expected.
diff --git a/gas/testsuite/gas/loongarch/reg-s9.s b/gas/testsuite/gas/loongarch/reg-s9.s
new file mode 100644
index 00000000000..74f40481ff2
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/reg-s9.s
@@ -0,0 +1,2 @@
+# Add support for $s9 register
+addi.d $t0, $s9, 0
diff --git a/include/opcode/loongarch.h b/include/opcode/loongarch.h
index 17de85c38b0..251daf13943 100644
--- a/include/opcode/loongarch.h
+++ b/include/opcode/loongarch.h
@@ -196,6 +196,7 @@ dec2 : [1-9][0-9]?
 
   extern const char *const loongarch_r_normal_name[32];
   extern const char *const loongarch_r_alias[32];
+  extern const char *const loongarch_r_alias_1[32];
   extern const char *const loongarch_r_alias_deprecated[32];
   extern const char *const loongarch_f_normal_name[32];
   extern const char *const loongarch_f_alias[32];
diff --git a/opcodes/loongarch-opc.c b/opcodes/loongarch-opc.c
index 490c689259c..6bd436fa1fe 100644
--- a/opcodes/loongarch-opc.c
+++ b/opcodes/loongarch-opc.c
@@ -49,6 +49,15 @@ const char *const loongarch_r_alias[32] =
   "$s1",   "$s2", "$s3", "$s4", "$s5", "$s6", "$s7", "$s8",
 };
 
+/* Add support for $s9.  */
+const char *const loongarch_r_alias_1[32] =
+{
+  "", "", "", "", "", "", "", "",
+  "", "", "", "", "", "", "", "",
+  "", "", "", "", "", "", "$s9", "",
+  "", "", "", "", "", "", "", "",
+};
+
 const char *const loongarch_r_alias_deprecated[32] =
 {
   "", "", "", "", "$v0", "$v1", "", "", "", "", "", "", "", "", "", "",
-- 
2.36.0