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-rw-r--r--arch/sparc/lib/memset.S197
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diff --git a/arch/sparc/lib/memset.S b/arch/sparc/lib/memset.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code
+ * Copyright (C) 1991,1996 Free Software Foundation
+ * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ *
+ * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and
+ * number of bytes not yet set if exception occurs and we were called as
+ * clear_user.
+ */
+
+#include <linux/export.h>
+#include <asm/ptrace.h>
+
+/* Work around cpp -rob */
+#define ALLOC #alloc
+#define EXECINSTR #execinstr
+#define EX(x,y,a,b) \
+98: x,y; \
+ .section .fixup,ALLOC,EXECINSTR; \
+ .align 4; \
+99: retl; \
+ a, b, %o0; \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4
+
+#define STORE(source, base, offset, n) \
+98: std source, [base + offset + n]; \
+ .section .fixup,ALLOC,EXECINSTR; \
+ .align 4; \
+99: ba 30f; \
+ sub %o3, n - offset, %o3; \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4;
+
+#define STORE_LAST(source, base, offset, n) \
+ EX(std source, [base - offset - n], \
+ add %o1, offset + n);
+
+/* Please don't change these macros, unless you change the logic
+ * in the .fixup section below as well.
+ * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
+#define ZERO_BIG_BLOCK(base, offset, source) \
+ STORE(source, base, offset, 0x00); \
+ STORE(source, base, offset, 0x08); \
+ STORE(source, base, offset, 0x10); \
+ STORE(source, base, offset, 0x18); \
+ STORE(source, base, offset, 0x20); \
+ STORE(source, base, offset, 0x28); \
+ STORE(source, base, offset, 0x30); \
+ STORE(source, base, offset, 0x38);
+
+#define ZERO_LAST_BLOCKS(base, offset, source) \
+ STORE_LAST(source, base, offset, 0x38); \
+ STORE_LAST(source, base, offset, 0x30); \
+ STORE_LAST(source, base, offset, 0x28); \
+ STORE_LAST(source, base, offset, 0x20); \
+ STORE_LAST(source, base, offset, 0x18); \
+ STORE_LAST(source, base, offset, 0x10); \
+ STORE_LAST(source, base, offset, 0x08); \
+ STORE_LAST(source, base, offset, 0x00);
+
+ .text
+ .align 4
+
+ .globl __bzero_begin
+__bzero_begin:
+
+ .globl __bzero
+ .type __bzero,#function
+ .globl memset
+ EXPORT_SYMBOL(__bzero)
+ EXPORT_SYMBOL(memset)
+memset:
+ mov %o0, %g1
+ mov 1, %g4
+ and %o1, 0xff, %g3
+ sll %g3, 8, %g2
+ or %g3, %g2, %g3
+ sll %g3, 16, %g2
+ or %g3, %g2, %g3
+ b 1f
+ mov %o2, %o1
+3:
+ cmp %o2, 3
+ be 2f
+ EX(stb %g3, [%o0], sub %o1, 0)
+
+ cmp %o2, 2
+ be 2f
+ EX(stb %g3, [%o0 + 0x01], sub %o1, 1)
+
+ EX(stb %g3, [%o0 + 0x02], sub %o1, 2)
+2:
+ sub %o2, 4, %o2
+ add %o1, %o2, %o1
+ b 4f
+ sub %o0, %o2, %o0
+
+__bzero:
+ clr %g4
+ mov %g0, %g3
+1:
+ cmp %o1, 7
+ bleu 7f
+ andcc %o0, 3, %o2
+
+ bne 3b
+4:
+ andcc %o0, 4, %g0
+
+ be 2f
+ mov %g3, %g2
+
+ EX(st %g3, [%o0], sub %o1, 0)
+ sub %o1, 4, %o1
+ add %o0, 4, %o0
+2:
+ andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run
+ be 9f
+ andcc %o1, 0x78, %o2
+10:
+ ZERO_BIG_BLOCK(%o0, 0x00, %g2)
+ subcc %o3, 128, %o3
+ ZERO_BIG_BLOCK(%o0, 0x40, %g2)
+ bne 10b
+ add %o0, 128, %o0
+
+ orcc %o2, %g0, %g0
+9:
+ be 13f
+ andcc %o1, 7, %o1
+
+ srl %o2, 1, %o3
+ set 13f, %o4
+ sub %o4, %o3, %o4
+ jmp %o4
+ add %o0, %o2, %o0
+
+ ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
+ ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
+13:
+ be 8f
+ andcc %o1, 4, %g0
+
+ be 1f
+ andcc %o1, 2, %g0
+
+ EX(st %g3, [%o0], and %o1, 7)
+ add %o0, 4, %o0
+1:
+ be 1f
+ andcc %o1, 1, %g0
+
+ EX(sth %g3, [%o0], and %o1, 3)
+ add %o0, 2, %o0
+1:
+ bne,a 8f
+ EX(stb %g3, [%o0], and %o1, 1)
+8:
+ b 0f
+ nop
+7:
+ be 13b
+ orcc %o1, 0, %g0
+
+ be 0f
+8:
+ add %o0, 1, %o0
+ subcc %o1, 1, %o1
+ bne 8b
+ EX(stb %g3, [%o0 - 1], add %o1, 1)
+0:
+ andcc %g4, 1, %g0
+ be 5f
+ nop
+ retl
+ mov %g1, %o0
+5:
+ retl
+ clr %o0
+
+ .section .fixup,#alloc,#execinstr
+ .align 4
+30:
+ and %o1, 0x7f, %o1
+ retl
+ add %o3, %o1, %o0
+
+ .globl __bzero_end
+__bzero_end: