1 files changed, 79 insertions, 0 deletions
diff --git a/lib/greenlet/platform/switch_arm32_gcc.h b/lib/greenlet/platform/switch_arm32_gcc.h
new file mode 100644
index 0000000..035d6b9
--- /dev/null
+++ b/lib/greenlet/platform/switch_arm32_gcc.h
@@ -0,0 +1,79 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 14-Aug-06 File creation. Ported from Arm Thumb. Sylvain Baro
+ *  3-Sep-06 Commented out saving of r1-r3 (r4 already commented out) as I
+ *           read that these do not need to be saved.  Also added notes and
+ *           errors related to the frame pointer. Richard Tew.
+ *
+ * NOTES
+ *
+ *   It is not possible to detect if fp is used or not, so the supplied
+ *   switch function needs to support it, so that you can remove it if
+ *   it does not apply to you.
+ *
+ * POSSIBLE ERRORS
+ *
+ *   "fp cannot be used in asm here"
+ *
+ *   - Try commenting out "fp" in REGS_TO_SAVE.
+ *
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+#define REG_SP "sp"
+#define REG_SPSP "sp,sp"
+#ifdef __thumb__
+#define REG_FP "r7"
+#define REG_FPFP "r7,r7"
+#define REGS_TO_SAVE_GENERAL "r4", "r5", "r6", "r8", "r9", "r10", "r11", "lr"
+#else
+#define REG_FP "fp"
+#define REG_FPFP "fp,fp"
+#define REGS_TO_SAVE_GENERAL "r4", "r5", "r6", "r7", "r8", "r9", "r10", "lr"
+#endif
+#if defined(__SOFTFP__)
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL
+#elif defined(__VFP_FP__)
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "d8", "d9", "d10", "d11", \
+                                           "d12", "d13", "d14", "d15"
+#elif defined(__MAVERICK__)
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "mvf4", "mvf5", "mvf6", "mvf7", \
+                                           "mvf8", "mvf9", "mvf10", "mvf11", \
+                                           "mvf12", "mvf13", "mvf14", "mvf15"
+#else
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "f4", "f5", "f6", "f7"
+#endif
+
+static int
+#ifdef __GNUC__
+__attribute__((optimize("no-omit-frame-pointer")))
+#endif
+slp_switch(void)
+{
+        void *fp;
+        register int *stackref, stsizediff;
+        int result;
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+        __asm__ volatile ("mov r0," REG_FP "\n\tstr r0,%0" : "=m" (fp) : : "r0");
+        __asm__ ("mov %0," REG_SP : "=r" (stackref));
+        {
+                SLP_SAVE_STATE(stackref, stsizediff);
+                __asm__ volatile (
+                    "add " REG_SPSP ",%0\n"
+                    "add " REG_FPFP ",%0\n"
+                    :
+                    : "r" (stsizediff)
+                    );
+                SLP_RESTORE_STATE();
+        }
+        __asm__ volatile ("ldr r0,%1\n\tmov " REG_FP ",r0\n\tmov %0, #0" : "=r" (result) : "m" (fp) : "r0");
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+        return result;
+}
+
+#endif