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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 <asm/ptrace.h>
| #include <asm/export.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: ba 30f; \
| a, b, %o0; \
| .section __ex_table,ALLOC; \
| .align 4; \
| .word 98b, 99b; \
| .text; \
| .align 4
|
| #define EXT(start,end,handler) \
| .section __ex_table,ALLOC; \
| .align 4; \
| .word start, 0, end, handler; \
| .text; \
| .align 4
|
| /* 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) \
| std source, [base + offset + 0x00]; \
| std source, [base + offset + 0x08]; \
| std source, [base + offset + 0x10]; \
| std source, [base + offset + 0x18]; \
| std source, [base + offset + 0x20]; \
| std source, [base + offset + 0x28]; \
| std source, [base + offset + 0x30]; \
| std source, [base + offset + 0x38];
|
| #define ZERO_LAST_BLOCKS(base, offset, source) \
| std source, [base - offset - 0x38]; \
| std source, [base - offset - 0x30]; \
| std source, [base - offset - 0x28]; \
| std source, [base - offset - 0x20]; \
| std source, [base - offset - 0x18]; \
| std source, [base - offset - 0x10]; \
| std source, [base - offset - 0x08]; \
| std 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)
| .globl __memset_start, __memset_end
| __memset_start:
| 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)
| 11:
| EXT(10b, 11b, 20f)
| 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
|
| 12:
| ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
| ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
| 13:
| EXT(12b, 13b, 21f)
| 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
| __memset_end:
|
| .section .fixup,#alloc,#execinstr
| .align 4
| 20:
| cmp %g2, 8
| bleu 1f
| and %o1, 0x7f, %o1
| sub %g2, 9, %g2
| add %o3, 64, %o3
| 1:
| sll %g2, 3, %g2
| add %o3, %o1, %o0
| b 30f
| sub %o0, %g2, %o0
| 21:
| mov 8, %o0
| and %o1, 7, %o1
| sub %o0, %g2, %o0
| sll %o0, 3, %o0
| b 30f
| add %o0, %o1, %o0
| 30:
| /* %o4 is faulting address, %o5 is %pc where fault occurred */
| save %sp, -104, %sp
| mov %i5, %o0
| mov %i7, %o1
| call lookup_fault
| mov %i4, %o2
| ret
| restore
|
| .globl __bzero_end
| __bzero_end:
|
|
