patch-2.3.36 linux/arch/sparc/lib/rwsem.S

• Lines: 192
• Date: Tue Jan 4 09:41:45 2000
• Orig file: v2.3.35/linux/arch/sparc/lib/rwsem.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/arch/sparc/lib/rwsem.S linux/arch/sparc/lib/rwsem.S
@@ -0,0 +1,191 @@
+/* $Id: rwsem.S,v 1.1 1999/12/28 11:50:39 jj Exp $
+ * Assembly part of rw semaphores.
+ *
+ * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)
+ */
+
+#include <asm/ptrace.h>
+#include <asm/psr.h>
+
+	.text
+	.align	4
+
+	.globl		___down_read
+___down_read:
+	rd		%psr, %g3
+	nop
+	nop
+	nop
+	or		%g3, PSR_PIL, %g7
+	wr		%g7, 0, %psr
+	nop
+	nop
+	nop
+#ifdef __SMP__
+1:	ldstub		[%g1 + 4], %g7
+	tst		%g7
+	bne		1b
+	 ld		[%g1], %g7
+	subcc		%g7, 1, %g7
+	st		%g7, [%g1]
+	stb		%g0, [%g1 + 4]
+#else
+	ld		[%g1], %g7
+	subcc		%g7, 1, %g7
+	st		%g7, [%g1]
+#endif
+	wr		%g3, 0, %psr
+	nop
+	bneg		3f
+	 nop
+2:	jmpl		%o7, %g0
+	 mov		%g4, %o7
+3:	save		%sp, -64, %sp
+	mov		%g1, %l1
+	mov		%g4, %l4
+	bcs		4f
+	 mov		%g5, %l5
+	call		down_read_failed
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		___down_read
+	 restore	%l5, %g0, %g5
+4:	call		down_read_failed_biased
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		2b
+	 restore	%l5, %g0, %g5
+
+	.globl		___down_write
+___down_write:
+	rd		%psr, %g3
+	nop
+	nop
+	nop
+	or		%g3, PSR_PIL, %g7
+	wr		%g7, 0, %psr
+	sethi		%hi(0x01000000), %g2
+	nop
+	nop
+#ifdef __SMP__
+1:	ldstub		[%g1 + 4], %g7
+	tst		%g7
+	bne		1b
+	 ld		[%g1], %g7
+	subcc		%g7, %g2, %g7
+	st		%g7, [%g1]
+	stb		%g0, [%g1 + 4]
+#else
+	ld		[%g1], %g7
+	subcc		%g7, %g2, %g7
+	st		%g7, [%g1]
+#endif
+	wr		%g3, 0, %psr
+	nop
+	bne		3f
+	 nop
+2:	jmpl		%o7, %g0
+	 mov		%g4, %o7
+3:	save		%sp, -64, %sp
+	mov		%g1, %l1
+	mov		%g4, %l4
+	bcs		4f
+	 mov		%g5, %l5
+	call		down_write_failed
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		___down_write
+	 restore	%l5, %g0, %g5
+4:	call		down_write_failed_biased
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		2b
+	 restore	%l5, %g0, %g5
+
+	.globl		___up_read
+___up_read:
+	rd		%psr, %g3
+	nop
+	nop
+	nop
+	or		%g3, PSR_PIL, %g7
+	wr		%g7, 0, %psr
+	nop
+	nop
+	nop
+#ifdef __SMP__
+1:	ldstub		[%g1 + 4], %g7
+	tst		%g7
+	bne		1b
+	 ld		[%g1], %g7
+	addcc		%g7, 1, %g7
+	st		%g7, [%g1]
+	stb		%g0, [%g1 + 4]
+#else
+	ld		[%g1], %g7
+	addcc		%g7, 1, %g7
+	st		%g7, [%g1]
+#endif
+	wr		%g3, 0, %psr
+	nop
+	be		3f
+	 nop
+2:	jmpl		%o7, %g0
+	 mov		%g4, %o7
+3:	save		%sp, -64, %sp
+	mov		%g1, %l1
+	mov		%g4, %l4
+	mov		%g5, %l5
+	clr		%o1
+	call		__rwsem_wake
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		2b
+	 restore	%l5, %g0, %g5
+
+	.globl		___up_write
+___up_write:
+	rd		%psr, %g3
+	nop
+	nop
+	nop
+	or		%g3, PSR_PIL, %g7
+	wr		%g7, 0, %psr
+	sethi		%hi(0x01000000), %g2
+	nop
+	nop
+#ifdef __SMP__
+1:	ldstub		[%g1 + 4], %g7
+	tst		%g7
+	bne		1b
+	 ld		[%g1], %g7
+	addcc		%g7, %g2, %g7
+	st		%g7, [%g1]
+	stb		%g0, [%g1 + 4]
+#else
+	ld		[%g1], %g7
+	addcc		%g7, %g2, %g7
+	st		%g7, [%g1]
+#endif
+	wr		%g3, 0, %psr
+	nop
+	bcs		3f
+	 nop
+2:	jmpl		%o7, %g0
+	 mov		%g4, %o7
+3:	save		%sp, -64, %sp
+	mov		%g1, %l1
+	mov		%g4, %l4
+	mov		%g5, %l5
+	mov		%g7, %o1
+	call		__rwsem_wake
+	 mov		%l1, %o0
+	mov		%l1, %g1
+	mov		%l4, %g4
+	ba		2b
+	 restore	%l5, %g0, %g5