AlkantarClanX12
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/*
* this is the internal transfer function.
*
* HISTORY
* 16-Oct-20 Jesse Gorzinski <jgorzins@us.ibm.com>
* Copied from Linux PPC64 implementation
* 04-Sep-18 Alexey Borzenkov <snaury@gmail.com>
* Workaround a gcc bug using manual save/restore of r30
* 21-Mar-18 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* Added r30 to the list of saved registers in order to fully comply with
* both ppc64 ELFv1 ABI and the ppc64le ELFv2 ABI, that classify this
* register as a nonvolatile register used for local variables.
* 21-Mar-18 Laszlo Boszormenyi <gcs@debian.org>
* Save r2 (TOC pointer) manually.
* 10-Dec-13 Ulrich Weigand <uweigand@de.ibm.com>
* Support ELFv2 ABI. Save float/vector registers.
* 09-Mar-12 Michael Ellerman <michael@ellerman.id.au>
* 64-bit implementation, copied from 32-bit.
* 07-Sep-05 (py-dev mailing list discussion)
* removed 'r31' from the register-saved. !!!! WARNING !!!!
* It means that this file can no longer be compiled statically!
* It is now only suitable as part of a dynamic library!
* 14-Jan-04 Bob Ippolito <bob@redivi.com>
* added cr2-cr4 to the registers to be saved.
* Open questions: Should we save FP registers?
* What about vector registers?
* Differences between darwin and unix?
* 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.
* 04-Oct-02 Gustavo Niemeyer <niemeyer@conectiva.com>
* Ported from MacOS version.
* 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>
* slightly changed framework for sparc
* 29-Jun-02 Christian Tismer <tismer@tismer.com>
* Added register 13-29, 31 saves. The same way as
* Armin Rigo did for the x86_unix version.
* This seems to be now fully functional!
* 04-Mar-02 Hye-Shik Chang <perky@fallin.lv>
* Ported from i386.
* 31-Jul-12 Trevor Bowen <trevorbowen@gmail.com>
* Changed memory constraints to register only.
*/
#define STACK_REFPLUS 1
#ifdef SLP_EVAL
#define STACK_MAGIC 6
#if defined(__ALTIVEC__)
#define ALTIVEC_REGS \
"v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", \
"v28", "v29", "v30", "v31",
#else
#define ALTIVEC_REGS
#endif
#define REGS_TO_SAVE "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
"r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
"r31", \
"fr14", "fr15", "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", \
"fr22", "fr23", "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", \
"fr30", "fr31", \
ALTIVEC_REGS \
"cr2", "cr3", "cr4"
static int
slp_switch(void)
{
int err;
long *stackref, stsizediff;
void * toc;
void * r30;
__asm__ volatile ("" : : : REGS_TO_SAVE);
__asm__ volatile ("std 2, %0" : "=m" (toc));
__asm__ volatile ("std 30, %0" : "=m" (r30));
__asm__ ("mr %0, 1" : "=r" (stackref) : );
{
SLP_SAVE_STATE(stackref, stsizediff);
__asm__ volatile (
"mr 11, %0\n"
"add 1, 1, 11\n"
: /* no outputs */
: "r" (stsizediff)
: "11"
);
SLP_RESTORE_STATE();
}
__asm__ volatile ("ld 30, %0" : : "m" (r30));
__asm__ volatile ("ld 2, %0" : : "m" (toc));
__asm__ volatile ("" : : : REGS_TO_SAVE);
__asm__ volatile ("li %0, 0" : "=r" (err));
return err;
}
#endif