106 lines
3.7 KiB
C
106 lines
3.7 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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* 04-Sep-18 Alexey Borzenkov <snaury@gmail.com>
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* Workaround a gcc bug using manual save/restore of r30
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* 21-Mar-18 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
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* Added r30 to the list of saved registers in order to fully comply with
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* both ppc64 ELFv1 ABI and the ppc64le ELFv2 ABI, that classify this
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* register as a nonvolatile register used for local variables.
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* 21-Mar-18 Laszlo Boszormenyi <gcs@debian.org>
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* Save r2 (TOC pointer) manually.
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* 10-Dec-13 Ulrich Weigand <uweigand@de.ibm.com>
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* Support ELFv2 ABI. Save float/vector registers.
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* 09-Mar-12 Michael Ellerman <michael@ellerman.id.au>
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* 64-bit implementation, copied from 32-bit.
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* 07-Sep-05 (py-dev mailing list discussion)
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* removed 'r31' from the register-saved. !!!! WARNING !!!!
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* It means that this file can no longer be compiled statically!
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* It is now only suitable as part of a dynamic library!
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* 14-Jan-04 Bob Ippolito <bob@redivi.com>
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* added cr2-cr4 to the registers to be saved.
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* Open questions: Should we save FP registers?
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* What about vector registers?
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* Differences between darwin and unix?
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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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* 04-Oct-02 Gustavo Niemeyer <niemeyer@conectiva.com>
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* Ported from MacOS version.
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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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* slightly changed framework for sparc
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* 29-Jun-02 Christian Tismer <tismer@tismer.com>
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* Added register 13-29, 31 saves. The same way as
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* Armin Rigo did for the x86_unix version.
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* This seems to be now fully functional!
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* 04-Mar-02 Hye-Shik Chang <perky@fallin.lv>
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* Ported from i386.
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* 31-Jul-12 Trevor Bowen <trevorbowen@gmail.com>
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* Changed memory constraints to register only.
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*/
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#define STACK_REFPLUS 1
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#ifdef SLP_EVAL
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#if _CALL_ELF == 2
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#define STACK_MAGIC 4
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#else
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#define STACK_MAGIC 6
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#endif
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#if defined(__ALTIVEC__)
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#define ALTIVEC_REGS \
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"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", \
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"v28", "v29", "v30", "v31",
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#else
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#define ALTIVEC_REGS
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#endif
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#define REGS_TO_SAVE "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
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"r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
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"r31", \
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"fr14", "fr15", "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", \
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"fr22", "fr23", "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", \
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"fr30", "fr31", \
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ALTIVEC_REGS \
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"cr2", "cr3", "cr4"
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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 long *stackref, stsizediff;
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void * toc;
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void * r30;
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__asm__ volatile ("" : : : REGS_TO_SAVE);
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__asm__ volatile ("std 2, %0" : "=m" (toc));
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__asm__ volatile ("std 30, %0" : "=m" (r30));
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__asm__ ("mr %0, 1" : "=r" (stackref) : );
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{
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SLP_SAVE_STATE(stackref, stsizediff);
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__asm__ volatile (
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"mr 11, %0\n"
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"add 1, 1, 11\n"
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: /* no outputs */
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: "r" (stsizediff)
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: "11"
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);
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SLP_RESTORE_STATE();
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}
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__asm__ volatile ("ld 30, %0" : : "m" (r30));
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__asm__ volatile ("ld 2, %0" : : "m" (toc));
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__asm__ volatile ("" : : : REGS_TO_SAVE);
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__asm__ volatile ("li %0, 0" : "=r" (err));
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return err;
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}
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#endif
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