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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. */
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