93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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* this is the internal transfer function.
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*
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* HISTORY
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* 16-May-15 Alexey Borzenkov <snaury@gmail.com>
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* Move stack spilling code inside save/restore functions
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* 30-Aug-13 Floris Bruynooghe <flub@devork.be>
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Clean the register windows again before returning.
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This does not clobber the PIC register as it leaves
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the current window intact and is required for multi-
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threaded code to work correctly.
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* 08-Mar-11 Floris Bruynooghe <flub@devork.be>
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* No need to set return value register explicitly
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* before the stack and framepointer are adjusted
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* as none of the other registers are influenced by
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* this. Also don't needlessly clean the windows
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* ('ta %0" :: "i" (ST_CLEAN_WINDOWS)') as that
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* clobbers the gcc PIC register (%l7).
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* 24-Nov-02 Christian Tismer <tismer@tismer.com>
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* needed to add another magic constant to insure
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* that f in slp_eval_frame(PyFrameObject *f)
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* STACK_REFPLUS will probably be 1 in most cases.
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* gets included into the saved stack area.
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* 17-Sep-02 Christian Tismer <tismer@tismer.com>
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* after virtualizing stack save/restore, the
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* stack size shrunk a bit. Needed to introduce
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* an adjustment STACK_MAGIC per platform.
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* 15-Sep-02 Gerd Woetzel <gerd.woetzel@GMD.DE>
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* added support for SunOS sparc with gcc
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*/
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#define STACK_REFPLUS 1
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#ifdef SLP_EVAL
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#define STACK_MAGIC 0
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#if defined(__sparcv9)
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#define SLP_FLUSHW __asm__ volatile ("flushw")
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#else
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#define SLP_FLUSHW __asm__ volatile ("ta 3") /* ST_FLUSH_WINDOWS */
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#endif
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/* On sparc we need to spill register windows inside save/restore functions */
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#define SLP_BEFORE_SAVE_STATE() SLP_FLUSHW
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#define SLP_BEFORE_RESTORE_STATE() SLP_FLUSHW
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static int
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slp_switch(void)
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{
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register int err;
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register int *stackref, stsizediff;
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/* Put current stack pointer into stackref.
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* Register spilling is done in save/restore.
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*/
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__asm__ volatile ("mov %%sp, %0" : "=r" (stackref));
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{
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/* Thou shalt put SLP_SAVE_STATE into a local block */
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/* Copy the current stack onto the heap */
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SLP_SAVE_STATE(stackref, stsizediff);
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/* Increment stack and frame pointer by stsizediff */
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__asm__ volatile (
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"add %0, %%sp, %%sp\n\t"
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"add %0, %%fp, %%fp"
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: : "r" (stsizediff));
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/* Copy new stack from it's save store on the heap */
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SLP_RESTORE_STATE();
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__asm__ volatile ("mov %1, %0" : "=r" (err) : "i" (0));
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return err;
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}
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}
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#endif
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/*
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* further self-processing support
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*/
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/*
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* if you want to add self-inspection tools, place them
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* here. See the x86_msvc for the necessary defines.
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* These features are highly experimental und not
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* essential yet.
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*/
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