summaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/una_asm_32.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/una_asm_32.S')
-rw-r--r--arch/sparc/kernel/una_asm_32.S153
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/sparc/kernel/una_asm_32.S b/arch/sparc/kernel/una_asm_32.S
new file mode 100644
index 000000000000..8cc03458eb7e
--- /dev/null
+++ b/arch/sparc/kernel/una_asm_32.S
@@ -0,0 +1,153 @@
+/* una_asm.S: Kernel unaligned trap assembler helpers.
+ *
+ * Copyright (C) 1996,2005,2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/errno.h>
+
+ .text
+
+retl_efault:
+ retl
+ mov -EFAULT, %o0
+
+ /* int __do_int_store(unsigned long *dst_addr, int size,
+ * unsigned long *src_val)
+ *
+ * %o0 = dest_addr
+ * %o1 = size
+ * %o2 = src_val
+ *
+ * Return '0' on success, -EFAULT on failure.
+ */
+ .globl __do_int_store
+__do_int_store:
+ ld [%o2], %g1
+ cmp %1, 2
+ be 2f
+ cmp %1, 4
+ be 1f
+ srl %g1, 24, %g2
+ srl %g1, 16, %g7
+4: stb %g2, [%o0]
+ srl %g1, 8, %g2
+5: stb %g7, [%o0 + 1]
+ ld [%o2 + 4], %g7
+6: stb %g2, [%o0 + 2]
+ srl %g7, 24, %g2
+7: stb %g1, [%o0 + 3]
+ srl %g7, 16, %g1
+8: stb %g2, [%o0 + 4]
+ srl %g7, 8, %g2
+9: stb %g1, [%o0 + 5]
+10: stb %g2, [%o0 + 6]
+ b 0f
+11: stb %g7, [%o0 + 7]
+1: srl %g1, 16, %g7
+12: stb %g2, [%o0]
+ srl %g1, 8, %g2
+13: stb %g7, [%o0 + 1]
+14: stb %g2, [%o0 + 2]
+ b 0f
+15: stb %g1, [%o0 + 3]
+2: srl %g1, 8, %g2
+16: stb %g2, [%o0]
+17: stb %g1, [%o0 + 1]
+0: retl
+ mov 0, %o0
+
+ .section __ex_table,#alloc
+ .word 4b, retl_efault
+ .word 5b, retl_efault
+ .word 6b, retl_efault
+ .word 7b, retl_efault
+ .word 8b, retl_efault
+ .word 9b, retl_efault
+ .word 10b, retl_efault
+ .word 11b, retl_efault
+ .word 12b, retl_efault
+ .word 13b, retl_efault
+ .word 14b, retl_efault
+ .word 15b, retl_efault
+ .word 16b, retl_efault
+ .word 17b, retl_efault
+ .previous
+
+ /* int do_int_load(unsigned long *dest_reg, int size,
+ * unsigned long *saddr, int is_signed)
+ *
+ * %o0 = dest_reg
+ * %o1 = size
+ * %o2 = saddr
+ * %o3 = is_signed
+ *
+ * Return '0' on success, -EFAULT on failure.
+ */
+ .globl do_int_load
+do_int_load:
+ cmp %o1, 8
+ be 9f
+ cmp %o1, 4
+ be 6f
+4: ldub [%o2], %g1
+5: ldub [%o2 + 1], %g2
+ sll %g1, 8, %g1
+ tst %o3
+ be 3f
+ or %g1, %g2, %g1
+ sll %g1, 16, %g1
+ sra %g1, 16, %g1
+3: b 0f
+ st %g1, [%o0]
+6: ldub [%o2 + 1], %g2
+ sll %g1, 24, %g1
+7: ldub [%o2 + 2], %g7
+ sll %g2, 16, %g2
+8: ldub [%o2 + 3], %g3
+ sll %g7, 8, %g7
+ or %g3, %g2, %g3
+ or %g7, %g3, %g7
+ or %g1, %g7, %g1
+ b 0f
+ st %g1, [%o0]
+9: ldub [%o2], %g1
+10: ldub [%o2 + 1], %g2
+ sll %g1, 24, %g1
+11: ldub [%o2 + 2], %g7
+ sll %g2, 16, %g2
+12: ldub [%o2 + 3], %g3
+ sll %g7, 8, %g7
+ or %g1, %g2, %g1
+ or %g7, %g3, %g7
+ or %g1, %g7, %g7
+13: ldub [%o2 + 4], %g1
+ st %g7, [%o0]
+14: ldub [%o2 + 5], %g2
+ sll %g1, 24, %g1
+15: ldub [%o2 + 6], %g7
+ sll %g2, 16, %g2
+16: ldub [%o2 + 7], %g3
+ sll %g7, 8, %g7
+ or %g1, %g2, %g1
+ or %g7, %g3, %g7
+ or %g1, %g7, %g7
+ st %g7, [%o0 + 4]
+0: retl
+ mov 0, %o0
+
+ .section __ex_table,#alloc
+ .word 4b, retl_efault
+ .word 5b, retl_efault
+ .word 6b, retl_efault
+ .word 7b, retl_efault
+ .word 8b, retl_efault
+ .word 9b, retl_efault
+ .word 10b, retl_efault
+ .word 11b, retl_efault
+ .word 12b, retl_efault
+ .word 13b, retl_efault
+ .word 14b, retl_efault
+ .word 15b, retl_efault
+ .word 16b, retl_efault
+ .previous