486 строки
10 KiB
ArmAsm
486 строки
10 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/* copy_user.S: Sparc optimized copy_from_user and copy_to_user code.
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*
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* Copyright(C) 1995 Linus Torvalds
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* Copyright(C) 1996 David S. Miller
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* Copyright(C) 1996 Eddie C. Dost
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* Copyright(C) 1996,1998 Jakub Jelinek
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*
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* derived from:
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* e-mail between David and Eddie.
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*
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* Returns 0 if successful, otherwise count of bytes not copied yet
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*/
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#include <asm/ptrace.h>
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#include <asm/asmmacro.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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#include <asm/export.h>
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/* Work around cpp -rob */
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#define ALLOC #alloc
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#define EXECINSTR #execinstr
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#define EX(x,y,a,b) \
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98: x,y; \
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.section .fixup,ALLOC,EXECINSTR; \
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.align 4; \
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99: ba fixupretl; \
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a, b, %g3; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 99b; \
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.text; \
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.align 4
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#define EX2(x,y,c,d,e,a,b) \
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98: x,y; \
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.section .fixup,ALLOC,EXECINSTR; \
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.align 4; \
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99: c, d, e; \
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ba fixupretl; \
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a, b, %g3; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 99b; \
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.text; \
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.align 4
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#define EXO2(x,y) \
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98: x, y; \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word 98b, 97f; \
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.text; \
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.align 4
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#define EXT(start,end,handler) \
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.section __ex_table,ALLOC; \
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.align 4; \
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.word start, 0, end, handler; \
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.text; \
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.align 4
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/* Please do not change following macros unless you change logic used
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* in .fixup at the end of this file as well
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*/
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/* Both these macros have to start with exactly the same insn */
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#define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
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ldd [%src + (offset) + 0x00], %t0; \
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ldd [%src + (offset) + 0x08], %t2; \
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ldd [%src + (offset) + 0x10], %t4; \
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ldd [%src + (offset) + 0x18], %t6; \
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st %t0, [%dst + (offset) + 0x00]; \
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st %t1, [%dst + (offset) + 0x04]; \
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st %t2, [%dst + (offset) + 0x08]; \
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st %t3, [%dst + (offset) + 0x0c]; \
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st %t4, [%dst + (offset) + 0x10]; \
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st %t5, [%dst + (offset) + 0x14]; \
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st %t6, [%dst + (offset) + 0x18]; \
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st %t7, [%dst + (offset) + 0x1c];
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#define MOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
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ldd [%src + (offset) + 0x00], %t0; \
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ldd [%src + (offset) + 0x08], %t2; \
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ldd [%src + (offset) + 0x10], %t4; \
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ldd [%src + (offset) + 0x18], %t6; \
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std %t0, [%dst + (offset) + 0x00]; \
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std %t2, [%dst + (offset) + 0x08]; \
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std %t4, [%dst + (offset) + 0x10]; \
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std %t6, [%dst + (offset) + 0x18];
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#define MOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \
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ldd [%src - (offset) - 0x10], %t0; \
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ldd [%src - (offset) - 0x08], %t2; \
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st %t0, [%dst - (offset) - 0x10]; \
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st %t1, [%dst - (offset) - 0x0c]; \
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st %t2, [%dst - (offset) - 0x08]; \
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st %t3, [%dst - (offset) - 0x04];
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#define MOVE_HALFCHUNK(src, dst, offset, t0, t1, t2, t3) \
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lduh [%src + (offset) + 0x00], %t0; \
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lduh [%src + (offset) + 0x02], %t1; \
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lduh [%src + (offset) + 0x04], %t2; \
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lduh [%src + (offset) + 0x06], %t3; \
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sth %t0, [%dst + (offset) + 0x00]; \
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sth %t1, [%dst + (offset) + 0x02]; \
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sth %t2, [%dst + (offset) + 0x04]; \
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sth %t3, [%dst + (offset) + 0x06];
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#define MOVE_SHORTCHUNK(src, dst, offset, t0, t1) \
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ldub [%src - (offset) - 0x02], %t0; \
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ldub [%src - (offset) - 0x01], %t1; \
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stb %t0, [%dst - (offset) - 0x02]; \
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stb %t1, [%dst - (offset) - 0x01];
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.text
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.align 4
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.globl __copy_user_begin
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__copy_user_begin:
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.globl __copy_user
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EXPORT_SYMBOL(__copy_user)
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dword_align:
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andcc %o1, 1, %g0
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be 4f
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andcc %o1, 2, %g0
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EXO2(ldub [%o1], %g2)
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add %o1, 1, %o1
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EXO2(stb %g2, [%o0])
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sub %o2, 1, %o2
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bne 3f
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add %o0, 1, %o0
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EXO2(lduh [%o1], %g2)
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add %o1, 2, %o1
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EXO2(sth %g2, [%o0])
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sub %o2, 2, %o2
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b 3f
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add %o0, 2, %o0
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4:
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EXO2(lduh [%o1], %g2)
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add %o1, 2, %o1
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EXO2(sth %g2, [%o0])
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sub %o2, 2, %o2
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b 3f
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add %o0, 2, %o0
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__copy_user: /* %o0=dst %o1=src %o2=len */
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xor %o0, %o1, %o4
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1:
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andcc %o4, 3, %o5
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2:
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bne cannot_optimize
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cmp %o2, 15
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bleu short_aligned_end
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andcc %o1, 3, %g0
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bne dword_align
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3:
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andcc %o1, 4, %g0
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be 2f
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mov %o2, %g1
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EXO2(ld [%o1], %o4)
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sub %g1, 4, %g1
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EXO2(st %o4, [%o0])
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add %o1, 4, %o1
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add %o0, 4, %o0
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2:
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andcc %g1, 0xffffff80, %g7
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be 3f
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andcc %o0, 4, %g0
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be ldd_std + 4
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5:
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MOVE_BIGCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
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80:
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EXT(5b, 80b, 50f)
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subcc %g7, 128, %g7
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add %o1, 128, %o1
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bne 5b
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add %o0, 128, %o0
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3:
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andcc %g1, 0x70, %g7
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be copy_user_table_end
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andcc %g1, 8, %g0
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sethi %hi(copy_user_table_end), %o5
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srl %g7, 1, %o4
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add %g7, %o4, %o4
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add %o1, %g7, %o1
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sub %o5, %o4, %o5
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jmpl %o5 + %lo(copy_user_table_end), %g0
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add %o0, %g7, %o0
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copy_user_table:
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MOVE_LASTCHUNK(o1, o0, 0x60, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x50, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x40, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x30, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x20, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x10, g2, g3, g4, g5)
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MOVE_LASTCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
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copy_user_table_end:
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EXT(copy_user_table, copy_user_table_end, 51f)
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be copy_user_last7
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andcc %g1, 4, %g0
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EX(ldd [%o1], %g2, and %g1, 0xf)
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add %o0, 8, %o0
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add %o1, 8, %o1
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EX(st %g2, [%o0 - 0x08], and %g1, 0xf)
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EX2(st %g3, [%o0 - 0x04], and %g1, 0xf, %g1, sub %g1, 4)
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copy_user_last7:
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be 1f
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andcc %g1, 2, %g0
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EX(ld [%o1], %g2, and %g1, 7)
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add %o1, 4, %o1
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EX(st %g2, [%o0], and %g1, 7)
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add %o0, 4, %o0
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1:
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be 1f
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andcc %g1, 1, %g0
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EX(lduh [%o1], %g2, and %g1, 3)
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add %o1, 2, %o1
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EX(sth %g2, [%o0], and %g1, 3)
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add %o0, 2, %o0
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1:
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be 1f
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nop
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EX(ldub [%o1], %g2, add %g0, 1)
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EX(stb %g2, [%o0], add %g0, 1)
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1:
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retl
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clr %o0
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ldd_std:
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MOVE_BIGALIGNCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGALIGNCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGALIGNCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
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MOVE_BIGALIGNCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
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81:
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EXT(ldd_std, 81b, 52f)
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subcc %g7, 128, %g7
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add %o1, 128, %o1
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bne ldd_std
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add %o0, 128, %o0
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andcc %g1, 0x70, %g7
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be copy_user_table_end
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andcc %g1, 8, %g0
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sethi %hi(copy_user_table_end), %o5
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srl %g7, 1, %o4
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add %g7, %o4, %o4
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add %o1, %g7, %o1
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sub %o5, %o4, %o5
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jmpl %o5 + %lo(copy_user_table_end), %g0
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add %o0, %g7, %o0
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cannot_optimize:
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bleu short_end
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cmp %o5, 2
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bne byte_chunk
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and %o2, 0xfffffff0, %o3
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andcc %o1, 1, %g0
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be 10f
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nop
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EXO2(ldub [%o1], %g2)
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add %o1, 1, %o1
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EXO2(stb %g2, [%o0])
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sub %o2, 1, %o2
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andcc %o2, 0xfffffff0, %o3
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be short_end
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add %o0, 1, %o0
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10:
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MOVE_HALFCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
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MOVE_HALFCHUNK(o1, o0, 0x08, g2, g3, g4, g5)
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82:
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EXT(10b, 82b, 53f)
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subcc %o3, 0x10, %o3
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add %o1, 0x10, %o1
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bne 10b
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add %o0, 0x10, %o0
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b 2f
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and %o2, 0xe, %o3
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byte_chunk:
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MOVE_SHORTCHUNK(o1, o0, -0x02, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x04, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x06, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x08, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x0a, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x0c, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x0e, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, -0x10, g2, g3)
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83:
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EXT(byte_chunk, 83b, 54f)
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subcc %o3, 0x10, %o3
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add %o1, 0x10, %o1
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bne byte_chunk
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add %o0, 0x10, %o0
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short_end:
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and %o2, 0xe, %o3
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2:
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sethi %hi(short_table_end), %o5
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sll %o3, 3, %o4
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add %o0, %o3, %o0
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sub %o5, %o4, %o5
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add %o1, %o3, %o1
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jmpl %o5 + %lo(short_table_end), %g0
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andcc %o2, 1, %g0
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84:
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MOVE_SHORTCHUNK(o1, o0, 0x0c, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x0a, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x08, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x06, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x04, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x02, g2, g3)
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MOVE_SHORTCHUNK(o1, o0, 0x00, g2, g3)
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short_table_end:
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EXT(84b, short_table_end, 55f)
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be 1f
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nop
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EX(ldub [%o1], %g2, add %g0, 1)
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EX(stb %g2, [%o0], add %g0, 1)
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1:
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retl
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clr %o0
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short_aligned_end:
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bne short_end
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andcc %o2, 8, %g0
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be 1f
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andcc %o2, 4, %g0
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EXO2(ld [%o1 + 0x00], %g2)
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EXO2(ld [%o1 + 0x04], %g3)
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add %o1, 8, %o1
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EXO2(st %g2, [%o0 + 0x00])
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EX(st %g3, [%o0 + 0x04], sub %o2, 4)
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add %o0, 8, %o0
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1:
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b copy_user_last7
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mov %o2, %g1
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.section .fixup,#alloc,#execinstr
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.align 4
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97:
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mov %o2, %g3
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fixupretl:
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retl
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mov %g3, %o0
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/* exception routine sets %g2 to (broken_insn - first_insn)>>2 */
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50:
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/* This magic counts how many bytes are left when crash in MOVE_BIGCHUNK
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* happens. This is derived from the amount ldd reads, st stores, etc.
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* x = g2 % 12;
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* g3 = g1 + g7 - ((g2 / 12) * 32 + (x < 4) ? 0 : (x - 4) * 4);
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* o0 += (g2 / 12) * 32;
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*/
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cmp %g2, 12
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add %o0, %g7, %o0
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bcs 1f
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cmp %g2, 24
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bcs 2f
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cmp %g2, 36
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bcs 3f
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nop
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sub %g2, 12, %g2
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sub %g7, 32, %g7
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3: sub %g2, 12, %g2
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sub %g7, 32, %g7
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2: sub %g2, 12, %g2
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sub %g7, 32, %g7
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1: cmp %g2, 4
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bcs,a 60f
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clr %g2
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sub %g2, 4, %g2
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sll %g2, 2, %g2
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60: and %g1, 0x7f, %g3
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sub %o0, %g7, %o0
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add %g3, %g7, %g3
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ba fixupretl
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sub %g3, %g2, %g3
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51:
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/* i = 41 - g2; j = i % 6;
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* g3 = (g1 & 15) + (i / 6) * 16 + (j < 4) ? (j + 1) * 4 : 16;
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* o0 -= (i / 6) * 16 + 16;
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*/
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neg %g2
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and %g1, 0xf, %g1
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add %g2, 41, %g2
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add %o0, %g1, %o0
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1: cmp %g2, 6
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bcs,a 2f
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cmp %g2, 4
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add %g1, 16, %g1
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b 1b
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sub %g2, 6, %g2
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2: bcc,a 2f
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mov 16, %g2
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inc %g2
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sll %g2, 2, %g2
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2: add %g1, %g2, %g3
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ba fixupretl
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sub %o0, %g3, %o0
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52:
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/* g3 = g1 + g7 - (g2 / 8) * 32 + (g2 & 4) ? (g2 & 3) * 8 : 0;
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o0 += (g2 / 8) * 32 */
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andn %g2, 7, %g4
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add %o0, %g7, %o0
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andcc %g2, 4, %g0
|
|
and %g2, 3, %g2
|
|
sll %g4, 2, %g4
|
|
sll %g2, 3, %g2
|
|
bne 60b
|
|
sub %g7, %g4, %g7
|
|
ba 60b
|
|
clr %g2
|
|
53:
|
|
/* g3 = o3 + (o2 & 15) - (g2 & 8) - (g2 & 4) ? (g2 & 3) * 2 : 0;
|
|
o0 += (g2 & 8) */
|
|
and %g2, 3, %g4
|
|
andcc %g2, 4, %g0
|
|
and %g2, 8, %g2
|
|
sll %g4, 1, %g4
|
|
be 1f
|
|
add %o0, %g2, %o0
|
|
add %g2, %g4, %g2
|
|
1: and %o2, 0xf, %g3
|
|
add %g3, %o3, %g3
|
|
ba fixupretl
|
|
sub %g3, %g2, %g3
|
|
54:
|
|
/* g3 = o3 + (o2 & 15) - (g2 / 4) * 2 - (g2 & 2) ? (g2 & 1) : 0;
|
|
o0 += (g2 / 4) * 2 */
|
|
srl %g2, 2, %o4
|
|
and %g2, 1, %o5
|
|
srl %g2, 1, %g2
|
|
add %o4, %o4, %o4
|
|
and %o5, %g2, %o5
|
|
and %o2, 0xf, %o2
|
|
add %o0, %o4, %o0
|
|
sub %o3, %o5, %o3
|
|
sub %o2, %o4, %o2
|
|
ba fixupretl
|
|
add %o2, %o3, %g3
|
|
55:
|
|
/* i = 27 - g2;
|
|
g3 = (o2 & 1) + i / 4 * 2 + !(i & 3);
|
|
o0 -= i / 4 * 2 + 1 */
|
|
neg %g2
|
|
and %o2, 1, %o2
|
|
add %g2, 27, %g2
|
|
srl %g2, 2, %o5
|
|
andcc %g2, 3, %g0
|
|
mov 1, %g2
|
|
add %o5, %o5, %o5
|
|
be,a 1f
|
|
clr %g2
|
|
1: add %g2, %o5, %g3
|
|
sub %o0, %g3, %o0
|
|
ba fixupretl
|
|
add %g3, %o2, %g3
|
|
|
|
.globl __copy_user_end
|
|
__copy_user_end:
|