Author: David Schneider <david.schnei...@picle.org>
Branch: arm-stacklet
Changeset: r64421:35453be9d318
Date: 2013-05-22 03:10 -0500
http://bitbucket.org/pypy/pypy/changeset/35453be9d318/
Log: initial implementation of slp_switch for ARM
diff --git a/rpython/translator/c/src/stacklet/switch_arm_gcc.h
b/rpython/translator/c/src/stacklet/switch_arm_gcc.h
new file mode 100644
--- /dev/null
+++ b/rpython/translator/c/src/stacklet/switch_arm_gcc.h
@@ -0,0 +1,40 @@
+
+static void __attribute__((optimize("O3"))) *slp_switch(void
*(*save_state)(void*, void*),
+ void *(*restore_state)(void*, void*),
+ void *extra)
+{
+ void *result;
+ __asm__ volatile (
+ "mov r3, %[save_state]\n"
+ /* save values in calee saved registers for later */
+ "mov r4, %[restore_state]\n"
+ "mov r5, %[extra]\n"
+ "mov r0, sp\n" /* arg 1: current (old) stack pointer */
+ "mov r1, r5\n" /* arg 2: extra */
+ "blx r3\n" /* call save_state() */
+
+ /* skip the rest if the return value is null */
+ "cmp r0, #0\n"
+ "beq zero\n"
+
+ "mov sp, r0\n" /* change the stack pointer */
+
+ /* From now on, the stack pointer is modified, but the content of the
+ stack is not restored yet. It contains only garbage here. */
+ "mov r1, r5\n" /* arg 2: extra */
+ /* arg 1: current (new)
stack pointer is already in r0*/
+ "blx r4\n" /* call restore_state() */
+
+ /* The stack's content is now restored. */
+ "zero:\n"
+ "mov %[result], r0\n"
+
+ : [result]"=r"(result) /* output variables */
+ /* input variables */
+ : [restore_state]"r"(restore_state),
+ [save_state]"r"(save_state),
+ [extra]"r"(extra)
+ : "lr", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r13"
+ );
+ return result;
+}
_______________________________________________
pypy-commit mailing list
pypy-commit@python.org
http://mail.python.org/mailman/listinfo/pypy-commit
