JezK
Edit File: switch_ppc64_linux.h
/* * this is the internal transfer function. * * HISTORY * 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 #if _CALL_ELF == 2 #define STACK_MAGIC 4 #else #define STACK_MAGIC 6 #endif #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) { register int err; register 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