libthread: rm Darwin pre-11.0.0 support

Darwin 11.0.0 was Mac OS X 10.7.0 aka Lion.
The previous version was Snow Leopard, which
has been unsupported by Apple since February 2014.

src/libthread/Darwin-386-asm.s

@@ -1,52 +0,0 @@
-.globl _tas
-_tas:
-	movl $0xCAFEBABE, %eax
-	movl 4(%esp), %ecx
-	xchgl %eax, 0(%ecx)
-	ret
-
-.globl _getmcontext
-_getmcontext:
-	movl	4(%esp), %eax
-
-	movl	%fs, 8(%eax)
-	movl	%es, 12(%eax)
-	movl	%ds, 16(%eax)
-	movl	%ss, 76(%eax)
-	movl	%edi, 20(%eax)
-	movl	%esi, 24(%eax)
-	movl	%ebp, 28(%eax)
-	movl	%ebx, 36(%eax)
-	movl	%edx, 40(%eax)		 
-	movl	%ecx, 44(%eax)
-
-	movl	$1, 48(%eax)	/* %eax */
-	movl	(%esp), %ecx	/* %eip */
-	movl	%ecx, 60(%eax)
-	leal	4(%esp), %ecx	/* %esp */
-	movl	%ecx, 72(%eax)
-
-	movl	44(%eax), %ecx	/* restore %ecx */
-	movl	$0, %eax
-	ret
-
-.globl _setmcontext
-_setmcontext:
-	movl	4(%esp), %eax
-
-	movl	8(%eax), %fs
-	movl	12(%eax), %es
-	movl	16(%eax), %ds
-	movl	76(%eax), %ss
-	movl	20(%eax), %edi
-	movl	24(%eax), %esi
-	movl	28(%eax), %ebp
-	movl	36(%eax), %ebx
-	movl	40(%eax), %edx
-	movl	44(%eax), %ecx
-
-	movl	72(%eax), %esp
-	pushl	60(%eax)	/* new %eip */
-	movl	48(%eax), %eax
-	ret
-

src/libthread/Darwin-386.c

@@ -1,30 +0,0 @@
-#include "threadimpl.h"
-
-void
-makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
-{
-	int *sp;
-
-	sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
-	sp -= argc;
-	/*
-	 * Stack pointer at call instruction (before return address
-	 * gets pushed) must be 16-byte aligned.
-	 */
-	if((uintptr)sp%4)
-		abort();
-	while((uintptr)sp%16)
-		sp--;
-	memmove(sp, &argc+1, argc*sizeof(int));
-	*--sp = 0;		/* return address */
-	ucp->uc_mcontext.mc_eip = (long)func;
-	ucp->uc_mcontext.mc_esp = (int)sp;
-}
-
-int
-swapcontext(ucontext_t *oucp, ucontext_t *ucp)
-{
-	if(getcontext(oucp) == 0)
-		setcontext(ucp);
-	return 0;
-}

src/libthread/Darwin-power-asm.s

@@ -1,83 +0,0 @@
-/* get FPR and VR use flags with sc 0x7FF3 */
-/* get vsave with mfspr reg, 256 */
-
-.text
-.align 2
-
-.globl	__getmcontext
-
-__getmcontext:				/* xxx: instruction scheduling */
-	mflr	r0
-	mfcr	r5
-	mfctr	r6
-	mfxer	r7
-	stw	r0, 0*4(r3)
-	stw	r5, 1*4(r3)
-	stw	r6, 2*4(r3)
-	stw	r7, 3*4(r3)
-
-	stw	r1, 4*4(r3)
-	stw	r2, 5*4(r3)
-	li	r5, 1			/* return value for setmcontext */
-	stw	r5, 6*4(r3)
-
-	stw	r13, (0+7)*4(r3)	/* callee-save GPRs */
-	stw	r14, (1+7)*4(r3)	/* xxx: block move */
-	stw	r15, (2+7)*4(r3)
-	stw	r16, (3+7)*4(r3)
-	stw	r17, (4+7)*4(r3)
-	stw	r18, (5+7)*4(r3)
-	stw	r19, (6+7)*4(r3)
-	stw	r20, (7+7)*4(r3)
-	stw	r21, (8+7)*4(r3)
-	stw	r22, (9+7)*4(r3)
-	stw	r23, (10+7)*4(r3)
-	stw	r24, (11+7)*4(r3)
-	stw	r25, (12+7)*4(r3)
-	stw	r26, (13+7)*4(r3)
-	stw	r27, (14+7)*4(r3)
-	stw	r28, (15+7)*4(r3)
-	stw	r29, (16+7)*4(r3)
-	stw	r30, (17+7)*4(r3)
-	stw	r31, (18+7)*4(r3)
-
-	li	r3, 0			/* return */
-	blr
-
-.globl	__setmcontext
-
-__setmcontext:
-	lwz	r13, (0+7)*4(r3)	/* callee-save GPRs */
-	lwz	r14, (1+7)*4(r3)	/* xxx: block move */
-	lwz	r15, (2+7)*4(r3)
-	lwz	r16, (3+7)*4(r3)
-	lwz	r17, (4+7)*4(r3)
-	lwz	r18, (5+7)*4(r3)
-	lwz	r19, (6+7)*4(r3)
-	lwz	r20, (7+7)*4(r3)
-	lwz	r21, (8+7)*4(r3)
-	lwz	r22, (9+7)*4(r3)
-	lwz	r23, (10+7)*4(r3)
-	lwz	r24, (11+7)*4(r3)
-	lwz	r25, (12+7)*4(r3)
-	lwz	r26, (13+7)*4(r3)
-	lwz	r27, (14+7)*4(r3)
-	lwz	r28, (15+7)*4(r3)
-	lwz	r29, (16+7)*4(r3)
-	lwz	r30, (17+7)*4(r3)
-	lwz	r31, (18+7)*4(r3)
-
-	lwz	r1, 4*4(r3)
-	lwz	r2, 5*4(r3)
-
-	lwz	r0, 0*4(r3)
-	mtlr	r0
-	lwz	r0, 1*4(r3)
-	mtcr	r0			/* mtcrf 0xFF, r0 */
-	lwz	r0, 2*4(r3)
-	mtctr	r0
-	lwz	r0, 3*4(r3)
-	mtxer	r0
-
-	lwz	r3,	6*4(r3)
-	blr

src/libthread/Darwin-power.c

@@ -1,24 +0,0 @@
-#include "threadimpl.h"
-
-void
-makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
-{
-	ulong *sp, *tos;
-	va_list arg;
-
-	tos = (ulong*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/sizeof(ulong);
-	sp = tos - 16;
-	ucp->mc.pc = (long)func;
-	ucp->mc.sp = (long)sp;
-	va_start(arg, argc);
-	ucp->mc.r3 = va_arg(arg, long);
-	va_end(arg);
-}
-
-int
-swapcontext(ucontext_t *oucp, ucontext_t *ucp)
-{
-	if(getcontext(oucp) == 0)
-		setcontext(ucp);
-	return 0;
-}

src/libthread/sysofiles.sh

@@ -7,9 +7,6 @@ case "$tag" in
 *-NetBSD-*)
 	echo ${SYSNAME}-${OBJTYPE}-asm.o $SYSNAME.o pthread.o stkmalloc.o
 	;;
-*-Darwin-10.[5-6].* | *-Darwin-[89].*)
-	echo ${SYSNAME}-${OBJTYPE}-asm.o $SYSNAME-${OBJTYPE}.o pthread.o stkmalloc.o
-	;;
 *-OpenBSD-*)
 	echo ${SYSNAME}-${OBJTYPE}-asm.o ${SYSNAME}-${OBJTYPE}.o pthread.o stkmmap.o
 	;;