AlkantarClanX12
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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)
{
int err;
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.
*/