libthread: use consistent stack calculation code in makecontext

Also reduce duplication: makecontext is per-arch not per-os-arch.

May fix #353.

1 files changed, 0 insertions, 38 deletions

diff --git a/src/libthread/Darwin-x86_64-swapcontext.c b/src/libthread/Darwin-x86_64-swapcontext.c
deleted file mode 100644
index c29ddb5e..00000000
--- a/src/libthread/Darwin-x86_64-swapcontext.c
+++ /dev/null
@@ -1,38 +0,0 @@
-#include "threadimpl.h"
-
-void
-makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
-{
-	uintptr *sp;
-	va_list arg;
-
-//fprint(2, "makecontext %d\n", argc);
-	if(argc != 2)
-		sysfatal("libthread: makecontext misused");
-	va_start(arg, argc);
-	uc->mc.di = va_arg(arg, uint);
-	uc->mc.si = va_arg(arg, uint);
-//fprint(2, "%ux %ux\n", uc->mc.di, uc->mc.si);
-	va_end(arg);
-
-	sp = (uintptr*)((char*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size);
-	/*
-	 * Stack pointer at call instruction (before return address
-	 * gets pushed) must be 16-byte aligned.
-	 */
-	if((uintptr)sp%4)
-		abort();
-	while((uintptr)sp%16 != 0)
-		sp--;
-	*--sp = 0;  // fn's return address
-	*--sp = (uintptr)fn;  // return address of setcontext
-	uc->mc.sp = (uintptr)sp;
-}
-
-int
-swapcontext(ucontext_t *oucp, ucontext_t *ucp)
-{
-	if(getcontext(oucp) == 0)
-		setcontext(ucp);
-	return 0;
-}