Import of the watch repository from Pebble

third_party/jerryscript/jerry-libc/arch/arm-v7.h

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+/* Copyright 2014-2016 Samsung Electronics Co., Ltd.
+ *
+ * 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 ASM_ARM_H
+#define ASM_ARM_H
+
+/*
+ * mov syscall_no (%r0) -> %r7
+ * svc #0
+ */
+#define SYSCALL_0 \
+  push {r4-r12, lr}; \
+  \
+  mov r7, r0; \
+  \
+  svc #0; \
+  \
+  pop {r4-r12, pc};
+
+/*
+ * mov syscall_no (%r0) -> %r7
+ * mov arg1 (%r1) -> %r0
+ * svc #0
+ */
+#define SYSCALL_1 \
+  push {r4-r12, lr}; \
+  \
+  mov r7, r0; \
+  mov r0, r1; \
+  \
+  svc #0; \
+  \
+  pop {r4-r12, pc};
+
+/*
+ * mov syscall_no (%r0) -> %r7
+ * mov arg1 (%r1) -> %r0
+ * mov arg2 (%r2) -> %r1
+ * svc #0
+ */
+#define SYSCALL_2 \
+  push {r4-r12, lr}; \
+  \
+  mov r7, r0; \
+  mov r0, r1; \
+  mov r1, r2; \
+  \
+  svc #0; \
+  \
+  pop {r4-r12, pc};
+
+/*
+ * mov syscall_no (%r0) -> %r7
+ * mov arg1 (%r1) -> %r0
+ * mov arg2 (%r2) -> %r1
+ * mov arg3 (%r3) -> %r2
+ * svc #0
+ */
+#define SYSCALL_3 \
+  push {r4-r12, lr}; \
+  \
+  mov r7, r0; \
+  mov r0, r1; \
+  mov r1, r2; \
+  mov r2, r3; \
+  \
+  svc #0; \
+  \
+  pop {r4-r12, pc};
+
+/*
+ * ldr argc ([sp + 0x0]) -> r0
+ * add argv (sp + 0x4) -> r1
+ *
+ * bl main
+ *
+ * bl exit
+ *
+ * infinite loop
+ */
+#define _START            \
+   ldr r0, [sp, #0];      \
+   add r1, sp, #4;        \
+   bl main;               \
+                          \
+   bl exit;               \
+   1:                     \
+   b 1b
+
+/**
+ * If hard-float mode:
+ *   store s16-s31 vfp registers to buffer, pointed with r0 register,
+ *   and increase the register on size of stored data.
+ */
+#ifdef __TARGET_HOST_ARMv7_HARD_FLOAT
+# define _STORE_VFP_S16_S31_IF_HARD_FLOAT \
+   vstm r0!, {s16 - s31};
+# define _LOAD_VFP_S16_S31_IF_HARD_FLOAT \
+   vldm r0!, {s16 - s31};
+#else /* !__TARGET_HOST_ARMv7_HARD_FLOAT */
+# define _STORE_VFP_S16_S31_IF_HARD_FLOAT
+# define _LOAD_VFP_S16_S31_IF_HARD_FLOAT
+#endif /* __TARGET_HOST_ARMv7_HARD_FLOAT */
+
+/*
+ * setjmp
+ *
+ * According to procedure call standard for the ARM architecture, the following
+ * registers are callee-saved, and so need to be stored in context:
+ *   - r4 - r11
+ *   - sp
+ *   - s16 - s31
+ *
+ * Also, we should store:
+ *   - lr
+ *
+ * stmia {r4-r11, sp, lr} -> jmp_buf_0 (r0)!
+ *
+ * If hard-float build
+ *   vstm  {s16-s31} -> jmp_buf_32 (r0)!
+ *
+ * mov r0, #0
+ *
+ * bx lr
+ */
+#define _SETJMP \
+  stmia r0!, {r4 - r11, sp, lr};    \
+                                    \
+  _STORE_VFP_S16_S31_IF_HARD_FLOAT  \
+                                    \
+  mov r0, #0;                       \
+                                    \
+  bx lr;
+
+/*
+ * longjmp
+ *
+ * See also:
+ *          _SETJMP
+ *
+ * ldmia jmp_buf_0 (r0)! -> {r4-r11, sp, lr}
+ *
+ * If hard-float build
+ *   vldm  jmp_buf_32 (r0)! -> {s16-s31}
+ *
+ * mov r1 -> r0
+ * cmp r0, #0
+ * bne 1f
+ * mov #1 -> r0
+ * 1:
+ *
+ * bx lr
+ */
+#define _LONGJMP \
+  ldmia r0!, {r4 - r11, sp, lr};    \
+                                    \
+  _LOAD_VFP_S16_S31_IF_HARD_FLOAT   \
+                                    \
+  mov r0, r1;                       \
+  cmp r0, #0;                       \
+  bne 1f;                           \
+  mov r0, #1;                       \
+  1:                                \
+                                    \
+  bx lr;
+
+#endif /* !ASM_ARM_H */