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- /*
- * 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.
- */
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