first add files

24 files changed, 1662 insertions, 0 deletions

diff --git a/lib/greenlet/platform/setup_switch_x64_masm.cmd b/lib/greenlet/platform/setup_switch_x64_masm.cmd
new file mode 100644
index 0000000..0928595
--- /dev/null
+++ b/lib/greenlet/platform/setup_switch_x64_masm.cmd
@@ -0,0 +1,2 @@
+call "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\vcvarsall.bat" amd64

+ml64 /nologo /c /Fo switch_x64_masm.obj switch_x64_masm.asm

diff --git a/lib/greenlet/platform/switch_aarch64_gcc.h b/lib/greenlet/platform/switch_aarch64_gcc.h
new file mode 100644
index 0000000..0b9d556
--- /dev/null
+++ b/lib/greenlet/platform/switch_aarch64_gcc.h
@@ -0,0 +1,69 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 07-Sep-16 Add clang support using x register naming. Fredrik Fornwall
+ * 13-Apr-13 Add support for strange GCC caller-save decisions
+ * 08-Apr-13 File creation. Michael Matz
+ *
+ * NOTES
+ *
+ * Simply save all callee saved registers
+ *
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+#define REGS_TO_SAVE "x19", "x20", "x21", "x22", "x23", "x24", "x25", "x26", \
+                     "x27", "x28", "x30" /* aka lr */, \
+                     "v8", "v9", "v10", "v11", \
+                     "v12", "v13", "v14", "v15"
+
+static int
+slp_switch(void)
+{
+	int err;
+	void *fp;
+        register long *stackref, stsizediff;
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+	__asm__ volatile ("str x29, %0" : "=m"(fp) : : );
+        __asm__ ("mov %0, sp" : "=r" (stackref));
+        {
+                SLP_SAVE_STATE(stackref, stsizediff);
+                __asm__ volatile (
+                    "add sp,sp,%0\n"
+                    "add x29,x29,%0\n"
+                    :
+                    : "r" (stsizediff)
+                    );
+		SLP_RESTORE_STATE();
+		/* SLP_SAVE_STATE macro contains some return statements
+		   (of -1 and 1).  It falls through only when
+		   the return value of slp_save_state() is zero, which
+		   is placed in x0.
+		   In that case we (slp_switch) also want to return zero
+		   (also in x0 of course).
+		   Now, some GCC versions (seen with 4.8) think it's a
+		   good idea to save/restore x0 around the call to
+		   slp_restore_state(), instead of simply zeroing it
+		   at the return below.  But slp_restore_state
+		   writes random values to the stack slot used for this
+		   save/restore (from when it once was saved above in
+		   SLP_SAVE_STATE, when it was still uninitialized), so
+		   "restoring" that precious zero actually makes us
+		   return random values.  There are some ways to make
+		   GCC not use that zero value in the normal return path
+		   (e.g. making err volatile, but that costs a little
+		   stack space), and the simplest is to call a function
+		   that returns an unknown value (which happens to be zero),
+		   so the saved/restored value is unused.  */
+           __asm__ volatile ("mov %0, #0" : "=r" (err));
+        }
+        __asm__ volatile ("ldr x29, %0" : : "m" (fp) :);
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+        return err;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_alpha_unix.h b/lib/greenlet/platform/switch_alpha_unix.h
new file mode 100644
index 0000000..216619f
--- /dev/null
+++ b/lib/greenlet/platform/switch_alpha_unix.h
@@ -0,0 +1,30 @@
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
+		     "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9"
+
+static int
+slp_switch(void)
+{
+  register int ret;
+  register long *stackref, stsizediff;
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  __asm__ volatile ("mov $30, %0" : "=r" (stackref) : );
+  {
+      SLP_SAVE_STATE(stackref, stsizediff);
+      __asm__ volatile (
+	  "addq $30, %0, $30\n\t"
+	  : /* no outputs */
+	  : "r" (stsizediff)
+	  );
+      SLP_RESTORE_STATE();
+  }
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  __asm__ volatile ("mov $31, %0" : "=r" (ret) : );
+  return ret;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_amd64_unix.h b/lib/greenlet/platform/switch_amd64_unix.h
new file mode 100644
index 0000000..16b99b7
--- /dev/null
+++ b/lib/greenlet/platform/switch_amd64_unix.h
@@ -0,0 +1,84 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 3-May-13   Ralf Schmitt  <ralf@systemexit.de>
+ *     Add support for strange GCC caller-save decisions
+ *     (ported from switch_aarch64_gcc.h)
+ * 18-Aug-11  Alexey Borzenkov  <snaury@gmail.com>
+ *      Correctly save rbp, csr and cw
+ * 01-Apr-04  Hye-Shik Chang    <perky@FreeBSD.org>
+ *      Ported from i386 to amd64.
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for spark
+ * 31-Avr-02  Armin Rigo         <arigo@ulb.ac.be>
+ *      Added ebx, esi and edi register-saves.
+ * 01-Mar-02  Samual M. Rushing  <rushing@ironport.com>
+ *      Ported from i386.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+/* #define STACK_MAGIC 3 */
+/* the above works fine with gcc 2.96, but 2.95.3 wants this */
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "r12", "r13", "r14", "r15"
+
+static int
+slp_switch(void)
+{
+    int err;
+    void* rbp;
+    void* rbx;
+    unsigned int csr;
+    unsigned short cw;
+    register long *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("fstcw %0" : "=m" (cw));
+    __asm__ volatile ("stmxcsr %0" : "=m" (csr));
+    __asm__ volatile ("movq %%rbp, %0" : "=m" (rbp));
+    __asm__ volatile ("movq %%rbx, %0" : "=m" (rbx));
+    __asm__ ("movq %%rsp, %0" : "=g" (stackref));
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "addq %0, %%rsp\n"
+            "addq %0, %%rbp\n"
+            :
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+        __asm__ volatile ("xorq %%rax, %%rax" : "=a" (err));
+    }
+    __asm__ volatile ("movq %0, %%rbx" : : "m" (rbx));
+    __asm__ volatile ("movq %0, %%rbp" : : "m" (rbp));
+    __asm__ volatile ("ldmxcsr %0" : : "m" (csr));
+    __asm__ volatile ("fldcw %0" : : "m" (cw));
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/* 
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
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
diff --git a/lib/greenlet/platform/switch_arm32_ios.h b/lib/greenlet/platform/switch_arm32_ios.h
new file mode 100644
index 0000000..e993707
--- /dev/null
+++ b/lib/greenlet/platform/switch_arm32_ios.h
@@ -0,0 +1,67 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 31-May-15 iOS support. Ported from arm32. Proton <feisuzhu@163.com>
+ *
+ * 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"
+#define REG_FP "r7"
+#define REG_FPFP "r7,r7"
+#define REGS_TO_SAVE_GENERAL "r4", "r5", "r6", "r8", "r10", "r11", "lr"
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "d8", "d9", "d10", "d11", \
+                                           "d12", "d13", "d14", "d15"
+
+static int
+#ifdef __GNUC__
+__attribute__((optimize("no-omit-frame-pointer")))
+#endif
+slp_switch(void)
+{
+        void *fp;
+        register int *stackref, stsizediff, result;
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+        __asm__ volatile ("str " REG_FP ",%0" : "=m" (fp));
+        __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)
+                    : REGS_TO_SAVE /* Clobber registers, force compiler to
+                                    * recalculate address of void *fp from REG_SP or REG_FP */
+                );
+                SLP_RESTORE_STATE();
+        }
+        __asm__ volatile (
+            "ldr " REG_FP ", %1\n\t"
+            "mov %0, #0"
+            : "=r" (result)
+            : "m" (fp)
+            : REGS_TO_SAVE /* Force compiler to restore saved registers after this */
+        );
+        return result;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_csky_gcc.h b/lib/greenlet/platform/switch_csky_gcc.h
new file mode 100644
index 0000000..7486b94
--- /dev/null
+++ b/lib/greenlet/platform/switch_csky_gcc.h
@@ -0,0 +1,48 @@
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+#define REG_FP "r8"
+#ifdef __CSKYABIV2__
+#define REGS_TO_SAVE_GENERAL "r4", "r5", "r6", "r7", "r9", "r10", "r11", "r15",\
+                             "r16", "r17", "r18", "r19", "r20", "r21", "r22",\
+                             "r23", "r24", "r25"
+
+#if defined (__CSKY_HARD_FLOAT__) || (__CSKY_VDSP__)
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL, "vr8", "vr9", "vr10", "vr11", "vr12",\
+                                           "vr13", "vr14", "vr15"
+#else
+#define REGS_TO_SAVE REGS_TO_SAVE_GENERAL
+#endif
+#else
+#define REGS_TO_SAVE "r9", "r10", "r11", "r12", "r13", "r15"
+#endif
+
+
+static int
+#ifdef __GNUC__
+__attribute__((optimize("no-omit-frame-pointer")))
+#endif
+slp_switch(void)
+{
+        register int *stackref, stsizediff;
+        int result;
+
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+        __asm__ ("mov %0, sp" : "=r" (stackref));
+        {
+                SLP_SAVE_STATE(stackref, stsizediff);
+                __asm__ volatile (
+                    "addu sp,%0\n"
+                    "addu "REG_FP",%0\n"
+                    :
+                    : "r" (stsizediff)
+                    );
+		
+                SLP_RESTORE_STATE();
+        }
+        __asm__ volatile ("movi %0, 0" : "=r" (result));
+        __asm__ volatile ("" : : : REGS_TO_SAVE);
+
+        return result;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_m68k_gcc.h b/lib/greenlet/platform/switch_m68k_gcc.h
new file mode 100644
index 0000000..da761c2
--- /dev/null
+++ b/lib/greenlet/platform/switch_m68k_gcc.h
@@ -0,0 +1,38 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 2014-01-06  Andreas Schwab  <schwab@linux-m68k.org>
+ *      File created.
+ */
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
+		     "%a2", "%a3", "%a4"
+
+static int
+slp_switch(void)
+{
+  int err;
+  int *stackref, stsizediff;
+  void *fp, *a5;
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  __asm__ volatile ("move.l %%fp, %0" : "=m"(fp));
+  __asm__ volatile ("move.l %%a5, %0" : "=m"(a5));
+  __asm__ ("move.l %%sp, %0" : "=r"(stackref));
+  {
+    SLP_SAVE_STATE(stackref, stsizediff);
+    __asm__ volatile ("add.l %0, %%sp; add.l %0, %%fp" : : "r"(stsizediff));
+    SLP_RESTORE_STATE();
+    __asm__ volatile ("clr.l %0" : "=g" (err));
+  }
+  __asm__ volatile ("move.l %0, %%a5" : : "m"(a5));
+  __asm__ volatile ("move.l %0, %%fp" : : "m"(fp));
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  return err;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_mips_unix.h b/lib/greenlet/platform/switch_mips_unix.h
new file mode 100644
index 0000000..1916b26
--- /dev/null
+++ b/lib/greenlet/platform/switch_mips_unix.h
@@ -0,0 +1,64 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 20-Sep-14 Matt Madison <madison@bliss-m.org>
+ *      Re-code the saving of the gp register for MIPS64.
+ * 05-Jan-08 Thiemo Seufer  <ths@debian.org>
+ *      Ported from ppc.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "$16", "$17", "$18", "$19", "$20", "$21", "$22", \
+       "$23", "$30"
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+#ifdef __mips64
+    uint64_t gpsave;
+#endif
+    __asm__ __volatile__ ("" : : : REGS_TO_SAVE);
+#ifdef __mips64
+    __asm__ __volatile__ ("sd $28,%0" : "=m" (gpsave) : : );
+#endif
+    __asm__ ("move %0, $29" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ __volatile__ (
+#ifdef __mips64
+            "daddu $29, %0\n"
+#else
+            "addu $29, %0\n"
+#endif
+            : /* no outputs */
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+    }
+#ifdef __mips64
+    __asm__ __volatile__ ("ld $28,%0" : : "m" (gpsave) : );
+#endif
+    __asm__ __volatile__ ("" : : : REGS_TO_SAVE);
+    __asm__ __volatile__ ("move %0, $0" : "=r" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_ppc64_aix.h b/lib/greenlet/platform/switch_ppc64_aix.h
new file mode 100644
index 0000000..e07b8de
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc64_aix.h
@@ -0,0 +1,103 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 16-Oct-20  Jesse Gorzinski <jgorzins@us.ibm.com>
+ *      Copied from Linux PPC64 implementation
+ * 04-Sep-18  Alexey Borzenkov  <snaury@gmail.com>
+ *      Workaround a gcc bug using manual save/restore of r30
+ * 21-Mar-18  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
+ *      Added r30 to the list of saved registers in order to fully comply with
+ *      both ppc64 ELFv1 ABI and the ppc64le ELFv2 ABI, that classify this
+ *      register as a nonvolatile register used for local variables.
+ * 21-Mar-18  Laszlo Boszormenyi  <gcs@debian.org>
+ *      Save r2 (TOC pointer) manually.
+ * 10-Dec-13  Ulrich Weigand  <uweigand@de.ibm.com>
+ *	Support ELFv2 ABI.  Save float/vector registers.
+ * 09-Mar-12 Michael Ellerman <michael@ellerman.id.au>
+ *      64-bit implementation, copied from 32-bit.
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 04-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported from MacOS version.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ * 31-Jul-12  Trevor Bowen    <trevorbowen@gmail.com>
+ *      Changed memory constraints to register only.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 6
+
+#if defined(__ALTIVEC__)
+#define ALTIVEC_REGS \
+       "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", \
+       "v28", "v29", "v30", "v31",
+#else
+#define ALTIVEC_REGS
+#endif
+
+#define REGS_TO_SAVE "r14", "r15", "r16", "r17", "r18", "r19", "r20",  \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29",  \
+       "r31",                                                    \
+       "fr14", "fr15", "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", \
+       "fr22", "fr23", "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", \
+       "fr30", "fr31", \
+       ALTIVEC_REGS \
+       "cr2", "cr3", "cr4"
+
+static int
+slp_switch(void)
+{
+    register int err;
+    register long *stackref, stsizediff;
+    void * toc;
+    void * r30;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("std 2, %0" : "=m" (toc));
+    __asm__ volatile ("std 30, %0" : "=m" (r30));
+    __asm__ ("mr %0, 1" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "mr 11, %0\n"
+            "add 1, 1, 11\n"
+            : /* no outputs */
+            : "r" (stsizediff)
+            : "11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("ld 30, %0" : : "m" (r30));
+    __asm__ volatile ("ld 2, %0" : : "m" (toc));
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_ppc64_linux.h b/lib/greenlet/platform/switch_ppc64_linux.h
new file mode 100644
index 0000000..88e6847
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc64_linux.h
@@ -0,0 +1,105 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 04-Sep-18  Alexey Borzenkov  <snaury@gmail.com>
+ *      Workaround a gcc bug using manual save/restore of r30
+ * 21-Mar-18  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
+ *      Added r30 to the list of saved registers in order to fully comply with
+ *      both ppc64 ELFv1 ABI and the ppc64le ELFv2 ABI, that classify this
+ *      register as a nonvolatile register used for local variables.
+ * 21-Mar-18  Laszlo Boszormenyi  <gcs@debian.org>
+ *      Save r2 (TOC pointer) manually.
+ * 10-Dec-13  Ulrich Weigand  <uweigand@de.ibm.com>
+ *	Support ELFv2 ABI.  Save float/vector registers.
+ * 09-Mar-12 Michael Ellerman <michael@ellerman.id.au>
+ *      64-bit implementation, copied from 32-bit.
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 04-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported from MacOS version.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ * 31-Jul-12  Trevor Bowen    <trevorbowen@gmail.com>
+ *      Changed memory constraints to register only.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#if _CALL_ELF == 2
+#define STACK_MAGIC 4
+#else
+#define STACK_MAGIC 6
+#endif
+
+#if defined(__ALTIVEC__)
+#define ALTIVEC_REGS \
+       "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", \
+       "v28", "v29", "v30", "v31",
+#else
+#define ALTIVEC_REGS
+#endif
+
+#define REGS_TO_SAVE "r14", "r15", "r16", "r17", "r18", "r19", "r20",  \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29",  \
+       "r31",                                                    \
+       "fr14", "fr15", "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", \
+       "fr22", "fr23", "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", \
+       "fr30", "fr31", \
+       ALTIVEC_REGS \
+       "cr2", "cr3", "cr4"
+
+static int
+slp_switch(void)
+{
+    register int err;
+    register long *stackref, stsizediff;
+    void * toc;
+    void * r30;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("std 2, %0" : "=m" (toc));
+    __asm__ volatile ("std 30, %0" : "=m" (r30));
+    __asm__ ("mr %0, 1" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "mr 11, %0\n"
+            "add 1, 1, 11\n"
+            : /* no outputs */
+            : "r" (stsizediff)
+            : "11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("ld 30, %0" : : "m" (r30));
+    __asm__ volatile ("ld 2, %0" : : "m" (toc));
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_ppc_aix.h b/lib/greenlet/platform/switch_ppc_aix.h
new file mode 100644
index 0000000..c7d476f
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc_aix.h
@@ -0,0 +1,87 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 07-Mar-11 Floris Bruynooghe <flub@devork.be>
+ *      Do not add stsizediff to general purpose
+ *      register (GPR) 30 as this is a non-volatile and
+ *      unused by the PowerOpen Environment, therefore
+ *      this was modifying a user register instead of the
+ *      frame pointer (which does not seem to exist).
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 04-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported from MacOS version.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 3
+
+/* !!!!WARNING!!!! need to add "r31" in the next line if this header file
+ * is meant to be compiled non-dynamically!
+ */
+#define REGS_TO_SAVE "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
+       "cr2", "cr3", "cr4"
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ ("mr %0, 1" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "mr 11, %0\n"
+            "add 1, 1, 11\n"
+            : /* no outputs */
+            : "r" (stsizediff)
+            : "11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_ppc_linux.h b/lib/greenlet/platform/switch_ppc_linux.h
new file mode 100644
index 0000000..0a71255
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc_linux.h
@@ -0,0 +1,84 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 04-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported from MacOS version.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ * 31-Jul-12  Trevor Bowen    <trevorbowen@gmail.com>
+ *      Changed memory constraints to register only.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 3
+
+/* !!!!WARNING!!!! need to add "r31" in the next line if this header file
+ * is meant to be compiled non-dynamically!
+ */
+#define REGS_TO_SAVE "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
+       "cr2", "cr3", "cr4"
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ ("mr %0, 1" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "mr 11, %0\n"
+            "add 1, 1, 11\n"
+            "add 30, 30, 11\n"
+            : /* no outputs */
+            : "r" (stsizediff)
+            : "11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_ppc_macosx.h b/lib/greenlet/platform/switch_ppc_macosx.h
new file mode 100644
index 0000000..56e573f
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc_macosx.h
@@ -0,0 +1,82 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 3
+
+/* !!!!WARNING!!!! need to add "r31" in the next line if this header file
+ * is meant to be compiled non-dynamically!
+ */
+#define REGS_TO_SAVE "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
+       "cr2", "cr3", "cr4"
+
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ ("; asm block 2\n\tmr %0, r1" : "=g" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "; asm block 3\n"
+            "\tmr r11, %0\n"
+            "\tadd r1, r1, r11\n"
+            "\tadd r30, r30, r11\n"
+            : /* no outputs */
+            : "g" (stsizediff)
+            : "r11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_ppc_unix.h b/lib/greenlet/platform/switch_ppc_unix.h
new file mode 100644
index 0000000..2b3d307
--- /dev/null
+++ b/lib/greenlet/platform/switch_ppc_unix.h
@@ -0,0 +1,82 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'r31' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 14-Jan-04  Bob Ippolito <bob@redivi.com>
+ *      added cr2-cr4 to the registers to be saved.
+ *      Open questions: Should we save FP registers?
+ *      What about vector registers?
+ *      Differences between darwin and unix?
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 04-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported from MacOS version.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 29-Jun-02  Christian Tismer  <tismer@tismer.com>
+ *      Added register 13-29, 31 saves. The same way as
+ *      Armin Rigo did for the x86_unix version.
+ *      This seems to be now fully functional!
+ * 04-Mar-02  Hye-Shik Chang  <perky@fallin.lv>
+ *      Ported from i386.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 3
+
+/* !!!!WARNING!!!! need to add "r31" in the next line if this header file
+ * is meant to be compiled non-dynamically!
+ */
+#define REGS_TO_SAVE "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
+       "cr2", "cr3", "cr4"
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ ("mr %0, 1" : "=g" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "mr 11, %0\n"
+            "add 1, 1, 11\n"
+            "add 30, 30, 11\n"
+            : /* no outputs */
+            : "g" (stsizediff)
+            : "11"
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("li %0, 0" : "=r" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_riscv_unix.h b/lib/greenlet/platform/switch_riscv_unix.h
new file mode 100644
index 0000000..5b5ea98
--- /dev/null
+++ b/lib/greenlet/platform/switch_riscv_unix.h
@@ -0,0 +1,32 @@
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "s0", "s1", "s2", "s3", "s4", "s5", \
+		     "s6", "s7", "s8", "s9", "s10", "s11", "fs0", "fs1", \
+		     "fs2", "fs3", "fs4", "fs5", "fs6", "fs7", "fs8", "fs9", \
+		     "fs10", "fs11"
+
+static int
+slp_switch(void)
+{
+  register int ret;
+  register long *stackref, stsizediff;
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  __asm__ volatile ("mv %0, sp" : "=r" (stackref) : );
+  {
+      SLP_SAVE_STATE(stackref, stsizediff);
+      __asm__ volatile (
+	  "add sp, sp, %0\n\t"
+	  : /* no outputs */
+	  : "r" (stsizediff)
+	  );
+      SLP_RESTORE_STATE();
+  }
+  __asm__ volatile ("" : : : REGS_TO_SAVE);
+  __asm__ volatile ("mv %0, zero" : "=r" (ret) : );
+  return ret;
+}
+
+#endif
diff --git a/lib/greenlet/platform/switch_s390_unix.h b/lib/greenlet/platform/switch_s390_unix.h
new file mode 100644
index 0000000..6641854
--- /dev/null
+++ b/lib/greenlet/platform/switch_s390_unix.h
@@ -0,0 +1,87 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 25-Jan-12  Alexey Borzenkov <snaury@gmail.com>
+ *      Fixed Linux/S390 port to work correctly with
+ *      different optimization options both on 31-bit
+ *      and 64-bit. Thanks to Stefan Raabe for lots
+ *      of testing.
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 06-Oct-02  Gustavo Niemeyer <niemeyer@conectiva.com>
+ *      Ported to Linux/S390.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#ifdef __s390x__
+#define STACK_MAGIC 20 /* 20 * 8 = 160 bytes of function call area */
+#else
+#define STACK_MAGIC 24 /* 24 * 4 = 96 bytes of function call area */
+#endif
+
+/* Technically, r11-r13 also need saving, but function prolog starts
+   with stm(g) and since there are so many saved registers already
+   it won't be optimized, resulting in all r6-r15 being saved */
+#define REGS_TO_SAVE "r6", "r7", "r8", "r9", "r10", "r14", \
+		     "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
+		     "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
+
+static int
+slp_switch(void)
+{
+    register int ret;
+    register long *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+#ifdef __s390x__
+    __asm__ volatile ("lgr %0, 15" : "=r" (stackref) : );
+#else
+    __asm__ volatile ("lr %0, 15" : "=r" (stackref) : );
+#endif
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+/* N.B.
+   r11 may be used as the frame pointer, and in that case it cannot be
+   clobbered and needs offsetting just like the stack pointer (but in cases
+   where frame pointer isn't used we might clobber it accidentally). What's
+   scary is that r11 is 2nd (and even 1st when GOT is used) callee saved
+   register that gcc would chose for surviving function calls. However,
+   since r6-r10 are clobbered above, their cost for reuse is reduced, so
+   gcc IRA will chose them over r11 (not seeing r11 is implicitly saved),
+   making it relatively safe to offset in all cases. :) */
+        __asm__ volatile (
+#ifdef __s390x__
+            "agr 15, %0\n\t"
+            "agr 11, %0"
+#else
+            "ar 15, %0\n\t"
+            "ar 11, %0"
+#endif
+            : /* no outputs */
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("lhi %0, 0" : "=r" (ret) : );
+    return ret;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/* 
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_sparc_sun_gcc.h b/lib/greenlet/platform/switch_sparc_sun_gcc.h
new file mode 100644
index 0000000..652b57f
--- /dev/null
+++ b/lib/greenlet/platform/switch_sparc_sun_gcc.h
@@ -0,0 +1,92 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 16-May-15  Alexey Borzenkov <snaury@gmail.com>
+ *      Move stack spilling code inside save/restore functions
+ * 30-Aug-13  Floris Bruynooghe <flub@devork.be>
+        Clean the register windows again before returning.
+        This does not clobber the PIC register as it leaves
+        the current window intact and is required for multi-
+        threaded code to work correctly.
+ * 08-Mar-11  Floris Bruynooghe <flub@devork.be>
+ *      No need to set return value register explicitly
+ *      before the stack and framepointer are adjusted
+ *      as none of the other registers are influenced by
+ *      this.  Also don't needlessly clean the windows
+ *      ('ta %0" :: "i" (ST_CLEAN_WINDOWS)') as that
+ *      clobbers the gcc PIC register (%l7).
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      added support for SunOS sparc with gcc
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+
+#define STACK_MAGIC 0
+
+
+#if defined(__sparcv9)
+#define SLP_FLUSHW __asm__ volatile ("flushw")
+#else
+#define SLP_FLUSHW __asm__ volatile ("ta 3") /* ST_FLUSH_WINDOWS */
+#endif
+
+/* On sparc we need to spill register windows inside save/restore functions */
+#define SLP_BEFORE_SAVE_STATE() SLP_FLUSHW
+#define SLP_BEFORE_RESTORE_STATE() SLP_FLUSHW
+
+
+static int
+slp_switch(void)
+{
+    register int err;
+    register int *stackref, stsizediff;
+
+    /* Put current stack pointer into stackref.
+     * Register spilling is done in save/restore.
+     */
+    __asm__ volatile ("mov %%sp, %0" : "=r" (stackref));
+
+    {
+        /* Thou shalt put SLP_SAVE_STATE into a local block */
+        /* Copy the current stack onto the heap */
+        SLP_SAVE_STATE(stackref, stsizediff);
+
+        /* Increment stack and frame pointer by stsizediff */
+        __asm__ volatile (
+            "add %0, %%sp, %%sp\n\t"
+            "add %0, %%fp, %%fp"
+            : : "r" (stsizediff));
+
+        /* Copy new stack from it's save store on the heap */
+        SLP_RESTORE_STATE();
+
+        __asm__ volatile ("mov %1, %0" : "=r" (err) : "i" (0));
+        return err;
+    }
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_x32_unix.h b/lib/greenlet/platform/switch_x32_unix.h
new file mode 100644
index 0000000..cb14ec1
--- /dev/null
+++ b/lib/greenlet/platform/switch_x32_unix.h
@@ -0,0 +1,63 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 17-Aug-12  Fantix King <fantix.king@gmail.com>
+ *      Ported from amd64.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "r12", "r13", "r14", "r15"
+
+
+static int
+slp_switch(void)
+{
+    void* ebp;
+    void* ebx;
+    unsigned int csr;
+    unsigned short cw;
+    register int err;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("fstcw %0" : "=m" (cw));
+    __asm__ volatile ("stmxcsr %0" : "=m" (csr));
+    __asm__ volatile ("movl %%ebp, %0" : "=m" (ebp));
+    __asm__ volatile ("movl %%ebx, %0" : "=m" (ebx));
+    __asm__ ("movl %%esp, %0" : "=g" (stackref));
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "addl %0, %%esp\n"
+            "addl %0, %%ebp\n"
+            :
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ volatile ("movl %0, %%ebx" : : "m" (ebx));
+    __asm__ volatile ("movl %0, %%ebp" : : "m" (ebp));
+    __asm__ volatile ("ldmxcsr %0" : : "m" (csr));
+    __asm__ volatile ("fldcw %0" : : "m" (cw));
+    __asm__ volatile ("" : : : REGS_TO_SAVE);
+    __asm__ volatile ("xorl %%eax, %%eax" : "=a" (err));
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/*
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */
diff --git a/lib/greenlet/platform/switch_x64_masm.asm b/lib/greenlet/platform/switch_x64_masm.asm
new file mode 100644
index 0000000..f5c72a2
--- /dev/null
+++ b/lib/greenlet/platform/switch_x64_masm.asm
@@ -0,0 +1,111 @@
+;
+; stack switching code for MASM on x641
+; Kristjan Valur Jonsson, sept 2005
+;
+
+
+;prototypes for our calls
+slp_save_state_asm PROTO
+slp_restore_state_asm PROTO
+
+
+pushxmm MACRO reg
+    sub rsp, 16
+    .allocstack 16
+    movaps [rsp], reg ; faster than movups, but we must be aligned
+    ; .savexmm128 reg, offset  (don't know what offset is, no documentation)
+ENDM
+popxmm MACRO reg
+    movaps reg, [rsp] ; faster than movups, but we must be aligned
+    add rsp, 16
+ENDM
+
+pushreg MACRO reg
+    push reg
+    .pushreg reg
+ENDM
+popreg MACRO reg
+    pop reg
+ENDM
+
+
+.code
+slp_switch PROC FRAME
+    ;realign stack to 16 bytes after return address push, makes the following faster
+    sub rsp,8
+    .allocstack 8
+
+    pushxmm xmm15
+    pushxmm xmm14
+    pushxmm xmm13
+    pushxmm xmm12
+    pushxmm xmm11
+    pushxmm xmm10
+    pushxmm xmm9
+    pushxmm xmm8
+    pushxmm xmm7
+    pushxmm xmm6
+
+    pushreg r15
+    pushreg r14
+    pushreg r13
+    pushreg r12
+
+    pushreg rbp
+    pushreg rbx
+    pushreg rdi
+    pushreg rsi
+
+    sub rsp, 10h ;allocate the singlefunction argument (must be multiple of 16)
+    .allocstack 10h
+.endprolog
+
+    lea rcx, [rsp+10h] ;load stack base that we are saving
+    call slp_save_state_asm ;pass stackpointer, return offset in eax
+    cmp rax, 1
+    je EXIT1
+    cmp rax, -1
+    je EXIT2
+    ;actual stack switch:
+    add rsp, rax
+    call slp_restore_state_asm
+    xor rax, rax ;return 0
+
+EXIT:
+
+    add rsp, 10h
+    popreg rsi
+    popreg rdi
+    popreg rbx
+    popreg rbp
+
+    popreg r12
+    popreg r13
+    popreg r14
+    popreg r15
+
+    popxmm xmm6
+    popxmm xmm7
+    popxmm xmm8
+    popxmm xmm9
+    popxmm xmm10
+    popxmm xmm11
+    popxmm xmm12
+    popxmm xmm13
+    popxmm xmm14
+    popxmm xmm15
+
+    add rsp, 8
+    ret
+
+EXIT1:
+    mov rax, 1
+    jmp EXIT
+
+EXIT2:
+    sar rax, 1
+    jmp EXIT
+
+slp_switch ENDP
+
+END
\ No newline at end of file
diff --git a/lib/greenlet/platform/switch_x64_masm.obj b/lib/greenlet/platform/switch_x64_masm.obj
new file mode 100644
index 0000000..64e3e6b
--- /dev/null
+++ b/lib/greenlet/platform/switch_x64_masm.obj
diff --git a/lib/greenlet/platform/switch_x64_msvc.h b/lib/greenlet/platform/switch_x64_msvc.h
new file mode 100644
index 0000000..601ea56
--- /dev/null
+++ b/lib/greenlet/platform/switch_x64_msvc.h
@@ -0,0 +1,60 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 26-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      again as a result of virtualized stack access,
+ *      the compiler used less registers. Needed to
+ *      explicit mention registers in order to get them saved.
+ *      Thanks to Jeff Senn for pointing this out and help.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 01-Mar-02  Christian Tismer  <tismer@tismer.com>
+ *      Initial final version after lots of iterations for i386.
+ */
+
+/* Avoid alloca redefined warning on mingw64 */
+#ifndef alloca
+#define alloca _alloca
+#endif
+
+#define STACK_REFPLUS 1
+#define STACK_MAGIC 0
+
+/* Use the generic support for an external assembly language slp_switch function. */
+#define EXTERNAL_ASM
+
+#ifdef SLP_EVAL
+/* This always uses the external masm assembly file. */
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/* we have IsBadReadPtr available, so we can peek at objects */
+/*
+#define STACKLESS_SPY
+
+#ifdef IMPLEMENT_STACKLESSMODULE
+#include "Windows.h"
+#define CANNOT_READ_MEM(p, bytes) IsBadReadPtr(p, bytes)
+
+static int IS_ON_STACK(void*p)
+{
+    int stackref;
+    intptr_t stackbase = ((intptr_t)&stackref) & 0xfffff000;
+    return (intptr_t)p >= stackbase && (intptr_t)p < stackbase + 0x00100000;
+}
+
+#endif
+*/
\ No newline at end of file
diff --git a/lib/greenlet/platform/switch_x86_msvc.h b/lib/greenlet/platform/switch_x86_msvc.h
new file mode 100644
index 0000000..010a22c
--- /dev/null
+++ b/lib/greenlet/platform/switch_x86_msvc.h
@@ -0,0 +1,88 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 26-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      again as a result of virtualized stack access,
+ *      the compiler used less registers. Needed to
+ *      explicit mention registers in order to get them saved.
+ *      Thanks to Jeff Senn for pointing this out and help.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for sparc
+ * 01-Mar-02  Christian Tismer  <tismer@tismer.com>
+ *      Initial final version after lots of iterations for i386.
+ */
+
+#define alloca _alloca
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 0
+
+/* Some magic to quell warnings and keep slp_switch() from crashing when built
+   with VC90. Disable global optimizations, and the warning: frame pointer
+   register 'ebp' modified by inline assembly code */
+#pragma optimize("g", off)
+#pragma warning(disable:4731)
+
+static int
+slp_switch(void)
+{
+    void* seh;
+    register int *stackref, stsizediff;
+    __asm mov eax, fs:[0]
+    __asm mov [seh], eax
+    __asm mov stackref, esp;
+    /* modify EBX, ESI and EDI in order to get them preserved */
+    __asm mov ebx, ebx;
+    __asm xchg esi, edi;
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm {
+            mov     eax, stsizediff
+            add     esp, eax
+            add     ebp, eax
+        }
+        SLP_RESTORE_STATE();
+    }
+    __asm mov eax, [seh]
+    __asm mov fs:[0], eax
+    return 0;
+}
+
+/* re-enable ebp warning and global optimizations. */
+#pragma optimize("g", on)
+#pragma warning(default:4731)
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/* we have IsBadReadPtr available, so we can peek at objects */
+#define STACKLESS_SPY
+
+#ifdef IMPLEMENT_STACKLESSMODULE
+#include "Windows.h"
+#define CANNOT_READ_MEM(p, bytes) IsBadReadPtr(p, bytes)
+
+static int IS_ON_STACK(void*p)
+{
+    int stackref;
+    int stackbase = ((int)&stackref) & 0xfffff000;
+    return (int)p >= stackbase && (int)p < stackbase + 0x00100000;
+} 
+
+#endif
diff --git a/lib/greenlet/platform/switch_x86_unix.h b/lib/greenlet/platform/switch_x86_unix.h
new file mode 100644
index 0000000..3a95186
--- /dev/null
+++ b/lib/greenlet/platform/switch_x86_unix.h
@@ -0,0 +1,105 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 3-May-13   Ralf Schmitt  <ralf@systemexit.de>
+ *     Add support for strange GCC caller-save decisions
+ *     (ported from switch_aarch64_gcc.h)
+ * 19-Aug-11  Alexey Borzenkov  <snaury@gmail.com>
+ *      Correctly save ebp, ebx and cw
+ * 07-Sep-05 (py-dev mailing list discussion)
+ *      removed 'ebx' from the register-saved.  !!!! WARNING !!!!
+ *      It means that this file can no longer be compiled statically!
+ *      It is now only suitable as part of a dynamic library!
+ * 24-Nov-02  Christian Tismer  <tismer@tismer.com>
+ *      needed to add another magic constant to insure
+ *      that f in slp_eval_frame(PyFrameObject *f)
+ *      STACK_REFPLUS will probably be 1 in most cases.
+ *      gets included into the saved stack area.
+ * 17-Sep-02  Christian Tismer  <tismer@tismer.com>
+ *      after virtualizing stack save/restore, the
+ *      stack size shrunk a bit. Needed to introduce
+ *      an adjustment STACK_MAGIC per platform.
+ * 15-Sep-02  Gerd Woetzel       <gerd.woetzel@GMD.DE>
+ *      slightly changed framework for spark
+ * 31-Avr-02  Armin Rigo         <arigo@ulb.ac.be>
+ *      Added ebx, esi and edi register-saves.
+ * 01-Mar-02  Samual M. Rushing  <rushing@ironport.com>
+ *      Ported from i386.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+/* #define STACK_MAGIC 3 */
+/* the above works fine with gcc 2.96, but 2.95.3 wants this */
+#define STACK_MAGIC 0
+
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+# define ATTR_NOCLONE __attribute__((noclone))
+#else
+# define ATTR_NOCLONE
+#endif
+
+static int
+slp_switch(void)
+{
+    int err;
+#ifdef _WIN32
+    void *seh;
+#endif
+    void *ebp, *ebx;
+    unsigned short cw;
+    register int *stackref, stsizediff;
+    __asm__ volatile ("" : : : "esi", "edi");
+    __asm__ volatile ("fstcw %0" : "=m" (cw));
+    __asm__ volatile ("movl %%ebp, %0" : "=m" (ebp));
+    __asm__ volatile ("movl %%ebx, %0" : "=m" (ebx));
+#ifdef _WIN32
+    __asm__ volatile (
+        "movl %%fs:0x0, %%eax\n"
+        "movl %%eax, %0\n"
+        : "=m" (seh)
+        :
+        : "eax");
+#endif
+    __asm__ ("movl %%esp, %0" : "=g" (stackref));
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ volatile (
+            "addl %0, %%esp\n"
+            "addl %0, %%ebp\n"
+            :
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+        __asm__ volatile ("xorl %%eax, %%eax" : "=a" (err));
+    }
+#ifdef _WIN32
+    __asm__ volatile (
+        "movl %0, %%eax\n"
+        "movl %%eax, %%fs:0x0\n"
+        :
+        : "m" (seh)
+        : "eax");
+#endif
+    __asm__ volatile ("movl %0, %%ebx" : : "m" (ebx));
+    __asm__ volatile ("movl %0, %%ebp" : : "m" (ebp));
+    __asm__ volatile ("fldcw %0" : : "m" (cw));
+    __asm__ volatile ("" : : : "esi", "edi");
+    return err;
+}
+
+#endif
+
+/*
+ * further self-processing support
+ */
+
+/* 
+ * if you want to add self-inspection tools, place them
+ * here. See the x86_msvc for the necessary defines.
+ * These features are highly experimental und not
+ * essential yet.
+ */