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Author: Floris Bruynooghe <flub@devork.be>
Origin: https://github.com/python-greenlet/greenlet/commit/29d50b1aac84500163e48268355f3aa88b707539
Subject: Fix the sparc/solaris header
This header used a relic from the original stackless sources which
referred to a structure which does not exist in greenlet. Furthermore
it seems to have never worked with gcc > 4.0.0 as a dynamicly loaded
library as it clobbered gcc's PIC register (%l7).
--- a/platform/switch_sparc_sun_gcc.h
+++ b/platform/switch_sparc_sun_gcc.h
@@ -42,20 +42,10 @@ slp_switch(void)
SLP_SAVE_STATE(stackref, stsizediff);
/* Increment stack and frame pointer by stsizediff */
-
- /* Sparc special: at first load new return address.
- This cannot be done later, because the stack
- might be overwritten again just after SLP_RESTORE_STATE
- has finished. BTW: All other registers (l0-l7 and i0-i5)
- might be clobbered too.
- */
__asm__ volatile (
- "ld [%0+60], %%i7\n\t"
- "add %1, %%sp, %%sp\n\t"
- "add %1, %%fp, %%fp"
- : : "r" (_cst->stack), "r" (stsizediff)
- : "%l0", "%l1", "%l2", "%l3", "%l4", "%l5", "%l6", "%l7",
- "%i0", "%i1", "%i2", "%i3", "%i4", "%i5");
+ "add %0, %%sp, %%sp\n\t"
+ "add %0, %%fp, %%fp"
+ : : "r" (stsizediff));
SLP_RESTORE_STATE();
@@ -63,10 +53,12 @@ slp_switch(void)
* The LORD rained down burning sulfur on Sodom and Gomorra ...
*/
- /* Sparc special: Must make it *very* clear to the CPU that
- it shouldn't look back into the register windows
- */
- __asm__ volatile ( "ta %0" : : "i" (ST_CLEAN_WINDOWS));
+ /* No need to restore any registers from the stack nor clear them: the
+ * frame pointer has just been set and the return value register is
+ * also being set by the return statement below. After returning a
+ * restore instruction is given and the frame below us will load all
+ * it's registers using a fill_trap if required. */
+
return 0;
}
}
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