From 8d99e73db34fe13afe5c9d80bd18306a480db089 Mon Sep 17 00:00:00 2001
From: Robert Sipka <rsipka.uszeged@partner.samsung.com>
Date: Wed, 19 Apr 2017 00:10:05 +0200
Subject: [PATCH] Add `setjmp` and `longjmp` functions for nuttx-stm32f4
 target. (#1743)

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com
---
 targets/nuttx-stm32f4/Makefile     |  2 +-
 targets/nuttx-stm32f4/jerry_main.c | 25 ------------
 targets/nuttx-stm32f4/setjmp.S     | 65 ++++++++++++++++++++++++++++++
 targets/nuttx-stm32f4/setjmp.h     | 25 ++++++++++++
 4 files changed, 91 insertions(+), 26 deletions(-)
 create mode 100644 targets/nuttx-stm32f4/setjmp.S
 create mode 100644 targets/nuttx-stm32f4/setjmp.h

diff --git a/targets/nuttx-stm32f4/Makefile b/targets/nuttx-stm32f4/Makefile
index 55d4a888d..ecc95c547 100644
--- a/targets/nuttx-stm32f4/Makefile
+++ b/targets/nuttx-stm32f4/Makefile
@@ -48,7 +48,7 @@ jerry_core_allin.c:
 	echo '#include "jerryscript/jerry-libm/nextafter.c"' > jerry_core_allin.c
 	find $(ROOT_DIR)/jerryscript/jerry-core -name "*.c" | sed -r -e 's/(\.\.\/)*(.+)/#include "\2"/g' >> jerry_core_allin.c
 
-ASRCS =
+ASRCS = setjmp.S
 CSRCS = jerry_core_allin.c
 MAINSRC = jerry_main.c
 
diff --git a/targets/nuttx-stm32f4/jerry_main.c b/targets/nuttx-stm32f4/jerry_main.c
index fd8b15ba9..660afa7c4 100644
--- a/targets/nuttx-stm32f4/jerry_main.c
+++ b/targets/nuttx-stm32f4/jerry_main.c
@@ -376,28 +376,3 @@ jerry_port_get_current_time (void)
 {
   return 0;
 } /* jerry_port_get_current_time */
-
-/**
- * Compiler built-in setjmp function.
- *
- * @return 0 when called the first time
- *         1 when returns from a longjmp call
- */
-int
-setjmp (jmp_buf buf)
-{
-  return __builtin_setjmp (buf);
-} /* setjmp */
-
-/**
- * Compiler built-in longjmp function.
- *
- * Note:
- *   ignores value argument
- */
-void
-longjmp (jmp_buf buf, int value)
-{
-  /* Must be called with 1. */
-  __builtin_longjmp (buf, 1);
-} /* longjmp */
diff --git a/targets/nuttx-stm32f4/setjmp.S b/targets/nuttx-stm32f4/setjmp.S
new file mode 100644
index 000000000..783d87c9f
--- /dev/null
+++ b/targets/nuttx-stm32f4/setjmp.S
@@ -0,0 +1,65 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+.syntax unified
+
+.macro func _name
+.global \_name
+.type \_name, %function
+\_name:
+.endm
+.macro endfunc _name
+.size \_name, .-\_name
+.endm
+
+/**
+ * setjmp (jmp_buf env)
+ *
+ * See also:
+ *          longjmp
+ *
+ * @return 0 - if returns from direct call,
+ *         nonzero - if returns after longjmp.
+ */
+func setjmp
+  stmia r0!, {r4 - r11, lr}
+  str sp, [r0], #4
+  vstm r0, {s16 - s31}
+  mov r0, #0
+  bx lr
+endfunc setjmp
+
+/**
+ * longjmp (jmp_buf env, int val)
+ *
+ * Note:
+ *      if val is not 0, then it would be returned from setjmp,
+ *      otherwise - 0 would be returned.
+ *
+ * See also:
+ *          setjmp
+ */
+func longjmp
+  ldmia r0!, {r4 - r11, lr}
+  ldr sp, [r0]
+  add r0, r0, #4
+  vldm r0, {s16 - s31}
+  mov r0, r1
+  cmp r0, #0
+  bne 1f
+  mov r0, #1
+  1:
+  bx lr
+endfunc longjmp
diff --git a/targets/nuttx-stm32f4/setjmp.h b/targets/nuttx-stm32f4/setjmp.h
new file mode 100644
index 000000000..aad7f934a
--- /dev/null
+++ b/targets/nuttx-stm32f4/setjmp.h
@@ -0,0 +1,25 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef SETJMP_H
+#define SETJMP_H
+
+#include <stdint.h>
+
+typedef uint64_t jmp_buf[14];
+
+int setjmp (jmp_buf env);
+void longjmp (jmp_buf env, int val);
+
+#endif /* !SETJMP_H */