569 lines
11 KiB
ArmAsm
569 lines
11 KiB
ArmAsm
/*
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* Copyright (C) 2002 Paul Mackerras, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/export.h>
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#include <asm/asm-compat.h>
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#include <asm/feature-fixups.h>
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#ifndef SELFTEST_CASE
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/* 0 == most CPUs, 1 == POWER6, 2 == Cell */
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#define SELFTEST_CASE 0
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#endif
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#ifdef __BIG_ENDIAN__
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#define sLd sld /* Shift towards low-numbered address. */
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#define sHd srd /* Shift towards high-numbered address. */
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#else
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#define sLd srd /* Shift towards low-numbered address. */
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#define sHd sld /* Shift towards high-numbered address. */
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#endif
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/*
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* These macros are used to generate exception table entries.
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* The exception handlers below use the original arguments
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* (stored on the stack) and the point where we're up to in
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* the destination buffer, i.e. the address of the first
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* unmodified byte. Generally r3 points into the destination
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* buffer, but the first unmodified byte is at a variable
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* offset from r3. In the code below, the symbol r3_offset
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* is set to indicate the current offset at each point in
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* the code. This offset is then used as a negative offset
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* from the exception handler code, and those instructions
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* before the exception handlers are addi instructions that
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* adjust r3 to point to the correct place.
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*/
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.macro lex /* exception handler for load */
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100: EX_TABLE(100b, .Lld_exc - r3_offset)
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.endm
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.macro stex /* exception handler for store */
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100: EX_TABLE(100b, .Lst_exc - r3_offset)
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.endm
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.align 7
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_GLOBAL_TOC(__copy_tofrom_user)
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#ifdef CONFIG_PPC_BOOK3S_64
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BEGIN_FTR_SECTION
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nop
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FTR_SECTION_ELSE
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b __copy_tofrom_user_power7
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ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
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#endif
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_GLOBAL(__copy_tofrom_user_base)
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/* first check for a 4kB copy on a 4kB boundary */
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cmpldi cr1,r5,16
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cmpdi cr6,r5,4096
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or r0,r3,r4
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neg r6,r3 /* LS 3 bits = # bytes to 8-byte dest bdry */
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andi. r0,r0,4095
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std r3,-24(r1)
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crand cr0*4+2,cr0*4+2,cr6*4+2
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std r4,-16(r1)
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std r5,-8(r1)
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dcbt 0,r4
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beq .Lcopy_page_4K
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andi. r6,r6,7
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PPC_MTOCRF(0x01,r5)
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blt cr1,.Lshort_copy
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/* Below we want to nop out the bne if we're on a CPU that has the
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* CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
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* cleared.
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* At the time of writing the only CPU that has this combination of bits
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* set is Power6.
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*/
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test_feature = (SELFTEST_CASE == 1)
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BEGIN_FTR_SECTION
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nop
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FTR_SECTION_ELSE
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bne .Ldst_unaligned
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ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \
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CPU_FTR_UNALIGNED_LD_STD)
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.Ldst_aligned:
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addi r3,r3,-16
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r3_offset = 16
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test_feature = (SELFTEST_CASE == 0)
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BEGIN_FTR_SECTION
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andi. r0,r4,7
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bne .Lsrc_unaligned
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END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
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blt cr1,.Ldo_tail /* if < 16 bytes to copy */
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srdi r0,r5,5
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cmpdi cr1,r0,0
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lex; ld r7,0(r4)
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lex; ld r6,8(r4)
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addi r4,r4,16
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mtctr r0
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andi. r0,r5,0x10
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beq 22f
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addi r3,r3,16
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r3_offset = 0
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addi r4,r4,-16
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mr r9,r7
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mr r8,r6
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beq cr1,72f
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21:
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lex; ld r7,16(r4)
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lex; ld r6,24(r4)
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addi r4,r4,32
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stex; std r9,0(r3)
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r3_offset = 8
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stex; std r8,8(r3)
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r3_offset = 16
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22:
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lex; ld r9,0(r4)
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lex; ld r8,8(r4)
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stex; std r7,16(r3)
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r3_offset = 24
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stex; std r6,24(r3)
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addi r3,r3,32
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r3_offset = 0
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bdnz 21b
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72:
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stex; std r9,0(r3)
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r3_offset = 8
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stex; std r8,8(r3)
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r3_offset = 16
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andi. r5,r5,0xf
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beq+ 3f
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addi r4,r4,16
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.Ldo_tail:
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addi r3,r3,16
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r3_offset = 0
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bf cr7*4+0,246f
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lex; ld r9,0(r4)
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addi r4,r4,8
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stex; std r9,0(r3)
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addi r3,r3,8
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246: bf cr7*4+1,1f
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lex; lwz r9,0(r4)
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addi r4,r4,4
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stex; stw r9,0(r3)
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addi r3,r3,4
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1: bf cr7*4+2,2f
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lex; lhz r9,0(r4)
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addi r4,r4,2
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stex; sth r9,0(r3)
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addi r3,r3,2
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2: bf cr7*4+3,3f
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lex; lbz r9,0(r4)
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stex; stb r9,0(r3)
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3: li r3,0
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blr
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.Lsrc_unaligned:
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r3_offset = 16
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srdi r6,r5,3
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addi r5,r5,-16
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subf r4,r0,r4
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srdi r7,r5,4
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sldi r10,r0,3
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cmpldi cr6,r6,3
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andi. r5,r5,7
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mtctr r7
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subfic r11,r10,64
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add r5,r5,r0
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bt cr7*4+0,28f
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lex; ld r9,0(r4) /* 3+2n loads, 2+2n stores */
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lex; ld r0,8(r4)
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sLd r6,r9,r10
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lex; ldu r9,16(r4)
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sHd r7,r0,r11
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sLd r8,r0,r10
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or r7,r7,r6
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blt cr6,79f
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lex; ld r0,8(r4)
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b 2f
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28:
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lex; ld r0,0(r4) /* 4+2n loads, 3+2n stores */
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lex; ldu r9,8(r4)
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sLd r8,r0,r10
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addi r3,r3,-8
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r3_offset = 24
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blt cr6,5f
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lex; ld r0,8(r4)
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sHd r12,r9,r11
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sLd r6,r9,r10
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lex; ldu r9,16(r4)
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or r12,r8,r12
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sHd r7,r0,r11
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sLd r8,r0,r10
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addi r3,r3,16
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r3_offset = 8
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beq cr6,78f
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1: or r7,r7,r6
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lex; ld r0,8(r4)
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stex; std r12,8(r3)
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r3_offset = 16
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2: sHd r12,r9,r11
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sLd r6,r9,r10
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lex; ldu r9,16(r4)
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or r12,r8,r12
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stex; stdu r7,16(r3)
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r3_offset = 8
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sHd r7,r0,r11
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sLd r8,r0,r10
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bdnz 1b
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78:
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stex; std r12,8(r3)
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r3_offset = 16
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or r7,r7,r6
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79:
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stex; std r7,16(r3)
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r3_offset = 24
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5: sHd r12,r9,r11
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or r12,r8,r12
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stex; std r12,24(r3)
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r3_offset = 32
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bne 6f
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li r3,0
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blr
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6: cmpwi cr1,r5,8
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addi r3,r3,32
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r3_offset = 0
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sLd r9,r9,r10
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ble cr1,7f
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lex; ld r0,8(r4)
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sHd r7,r0,r11
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or r9,r7,r9
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7:
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bf cr7*4+1,1f
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#ifdef __BIG_ENDIAN__
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rotldi r9,r9,32
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#endif
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stex; stw r9,0(r3)
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#ifdef __LITTLE_ENDIAN__
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rotrdi r9,r9,32
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#endif
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addi r3,r3,4
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1: bf cr7*4+2,2f
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#ifdef __BIG_ENDIAN__
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rotldi r9,r9,16
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#endif
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stex; sth r9,0(r3)
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#ifdef __LITTLE_ENDIAN__
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rotrdi r9,r9,16
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#endif
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addi r3,r3,2
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2: bf cr7*4+3,3f
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#ifdef __BIG_ENDIAN__
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rotldi r9,r9,8
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#endif
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stex; stb r9,0(r3)
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#ifdef __LITTLE_ENDIAN__
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rotrdi r9,r9,8
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#endif
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3: li r3,0
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blr
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.Ldst_unaligned:
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r3_offset = 0
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PPC_MTOCRF(0x01,r6) /* put #bytes to 8B bdry into cr7 */
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subf r5,r6,r5
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li r7,0
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cmpldi cr1,r5,16
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bf cr7*4+3,1f
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100: EX_TABLE(100b, .Lld_exc_r7)
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lbz r0,0(r4)
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100: EX_TABLE(100b, .Lst_exc_r7)
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stb r0,0(r3)
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addi r7,r7,1
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1: bf cr7*4+2,2f
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100: EX_TABLE(100b, .Lld_exc_r7)
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lhzx r0,r7,r4
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100: EX_TABLE(100b, .Lst_exc_r7)
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sthx r0,r7,r3
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addi r7,r7,2
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2: bf cr7*4+1,3f
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100: EX_TABLE(100b, .Lld_exc_r7)
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lwzx r0,r7,r4
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100: EX_TABLE(100b, .Lst_exc_r7)
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stwx r0,r7,r3
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3: PPC_MTOCRF(0x01,r5)
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add r4,r6,r4
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add r3,r6,r3
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b .Ldst_aligned
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.Lshort_copy:
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r3_offset = 0
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bf cr7*4+0,1f
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lex; lwz r0,0(r4)
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lex; lwz r9,4(r4)
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addi r4,r4,8
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stex; stw r0,0(r3)
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stex; stw r9,4(r3)
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addi r3,r3,8
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1: bf cr7*4+1,2f
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lex; lwz r0,0(r4)
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addi r4,r4,4
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stex; stw r0,0(r3)
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addi r3,r3,4
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2: bf cr7*4+2,3f
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lex; lhz r0,0(r4)
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addi r4,r4,2
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stex; sth r0,0(r3)
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addi r3,r3,2
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3: bf cr7*4+3,4f
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lex; lbz r0,0(r4)
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stex; stb r0,0(r3)
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4: li r3,0
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blr
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/*
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* exception handlers follow
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* we have to return the number of bytes not copied
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* for an exception on a load, we set the rest of the destination to 0
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* Note that the number of bytes of instructions for adjusting r3 needs
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* to equal the amount of the adjustment, due to the trick of using
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* .Lld_exc - r3_offset as the handler address.
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*/
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.Lld_exc_r7:
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add r3,r3,r7
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b .Lld_exc
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/* adjust by 24 */
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addi r3,r3,8
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nop
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/* adjust by 16 */
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addi r3,r3,8
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nop
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/* adjust by 8 */
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addi r3,r3,8
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nop
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/*
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* Here we have had a fault on a load and r3 points to the first
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* unmodified byte of the destination. We use the original arguments
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* and r3 to work out how much wasn't copied. Since we load some
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* distance ahead of the stores, we continue copying byte-by-byte until
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* we hit the load fault again in order to copy as much as possible.
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*/
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.Lld_exc:
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ld r6,-24(r1)
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ld r4,-16(r1)
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ld r5,-8(r1)
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subf r6,r6,r3
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add r4,r4,r6
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subf r5,r6,r5 /* #bytes left to go */
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/*
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* first see if we can copy any more bytes before hitting another exception
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*/
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mtctr r5
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r3_offset = 0
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100: EX_TABLE(100b, .Ldone)
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43: lbz r0,0(r4)
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addi r4,r4,1
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stex; stb r0,0(r3)
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addi r3,r3,1
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bdnz 43b
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li r3,0 /* huh? all copied successfully this time? */
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blr
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/*
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* here we have trapped again, amount remaining is in ctr.
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*/
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.Ldone:
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mfctr r3
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blr
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/*
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* exception handlers for stores: we need to work out how many bytes
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* weren't copied, and we may need to copy some more.
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* Note that the number of bytes of instructions for adjusting r3 needs
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* to equal the amount of the adjustment, due to the trick of using
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* .Lst_exc - r3_offset as the handler address.
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*/
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.Lst_exc_r7:
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add r3,r3,r7
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b .Lst_exc
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/* adjust by 24 */
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addi r3,r3,8
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nop
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/* adjust by 16 */
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addi r3,r3,8
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nop
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/* adjust by 8 */
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addi r3,r3,4
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/* adjust by 4 */
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addi r3,r3,4
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.Lst_exc:
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ld r6,-24(r1) /* original destination pointer */
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ld r4,-16(r1) /* original source pointer */
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ld r5,-8(r1) /* original number of bytes */
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add r7,r6,r5
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/*
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* If the destination pointer isn't 8-byte aligned,
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* we may have got the exception as a result of a
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* store that overlapped a page boundary, so we may be
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* able to copy a few more bytes.
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*/
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17: andi. r0,r3,7
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beq 19f
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subf r8,r6,r3 /* #bytes copied */
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100: EX_TABLE(100b,19f)
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lbzx r0,r8,r4
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100: EX_TABLE(100b,19f)
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stb r0,0(r3)
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addi r3,r3,1
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cmpld r3,r7
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blt 17b
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19: subf r3,r3,r7 /* #bytes not copied in r3 */
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blr
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/*
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* Routine to copy a whole page of data, optimized for POWER4.
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* On POWER4 it is more than 50% faster than the simple loop
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* above (following the .Ldst_aligned label).
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*/
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.macro exc
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100: EX_TABLE(100b, .Labort)
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.endm
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.Lcopy_page_4K:
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std r31,-32(1)
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std r30,-40(1)
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std r29,-48(1)
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std r28,-56(1)
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std r27,-64(1)
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std r26,-72(1)
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std r25,-80(1)
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std r24,-88(1)
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std r23,-96(1)
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std r22,-104(1)
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std r21,-112(1)
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std r20,-120(1)
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li r5,4096/32 - 1
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addi r3,r3,-8
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li r0,5
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0: addi r5,r5,-24
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mtctr r0
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exc; ld r22,640(4)
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exc; ld r21,512(4)
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exc; ld r20,384(4)
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exc; ld r11,256(4)
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exc; ld r9,128(4)
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exc; ld r7,0(4)
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exc; ld r25,648(4)
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exc; ld r24,520(4)
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exc; ld r23,392(4)
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exc; ld r10,264(4)
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exc; ld r8,136(4)
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exc; ldu r6,8(4)
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cmpwi r5,24
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1:
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exc; std r22,648(3)
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exc; std r21,520(3)
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exc; std r20,392(3)
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exc; std r11,264(3)
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exc; std r9,136(3)
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exc; std r7,8(3)
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exc; ld r28,648(4)
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exc; ld r27,520(4)
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exc; ld r26,392(4)
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exc; ld r31,264(4)
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exc; ld r30,136(4)
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exc; ld r29,8(4)
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exc; std r25,656(3)
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exc; std r24,528(3)
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exc; std r23,400(3)
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exc; std r10,272(3)
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exc; std r8,144(3)
|
|
exc; std r6,16(3)
|
|
exc; ld r22,656(4)
|
|
exc; ld r21,528(4)
|
|
exc; ld r20,400(4)
|
|
exc; ld r11,272(4)
|
|
exc; ld r9,144(4)
|
|
exc; ld r7,16(4)
|
|
exc; std r28,664(3)
|
|
exc; std r27,536(3)
|
|
exc; std r26,408(3)
|
|
exc; std r31,280(3)
|
|
exc; std r30,152(3)
|
|
exc; stdu r29,24(3)
|
|
exc; ld r25,664(4)
|
|
exc; ld r24,536(4)
|
|
exc; ld r23,408(4)
|
|
exc; ld r10,280(4)
|
|
exc; ld r8,152(4)
|
|
exc; ldu r6,24(4)
|
|
bdnz 1b
|
|
exc; std r22,648(3)
|
|
exc; std r21,520(3)
|
|
exc; std r20,392(3)
|
|
exc; std r11,264(3)
|
|
exc; std r9,136(3)
|
|
exc; std r7,8(3)
|
|
addi r4,r4,640
|
|
addi r3,r3,648
|
|
bge 0b
|
|
mtctr r5
|
|
exc; ld r7,0(4)
|
|
exc; ld r8,8(4)
|
|
exc; ldu r9,16(4)
|
|
3:
|
|
exc; ld r10,8(4)
|
|
exc; std r7,8(3)
|
|
exc; ld r7,16(4)
|
|
exc; std r8,16(3)
|
|
exc; ld r8,24(4)
|
|
exc; std r9,24(3)
|
|
exc; ldu r9,32(4)
|
|
exc; stdu r10,32(3)
|
|
bdnz 3b
|
|
4:
|
|
exc; ld r10,8(4)
|
|
exc; std r7,8(3)
|
|
exc; std r8,16(3)
|
|
exc; std r9,24(3)
|
|
exc; std r10,32(3)
|
|
9: ld r20,-120(1)
|
|
ld r21,-112(1)
|
|
ld r22,-104(1)
|
|
ld r23,-96(1)
|
|
ld r24,-88(1)
|
|
ld r25,-80(1)
|
|
ld r26,-72(1)
|
|
ld r27,-64(1)
|
|
ld r28,-56(1)
|
|
ld r29,-48(1)
|
|
ld r30,-40(1)
|
|
ld r31,-32(1)
|
|
li r3,0
|
|
blr
|
|
|
|
/*
|
|
* on an exception, reset to the beginning and jump back into the
|
|
* standard __copy_tofrom_user
|
|
*/
|
|
.Labort:
|
|
ld r20,-120(1)
|
|
ld r21,-112(1)
|
|
ld r22,-104(1)
|
|
ld r23,-96(1)
|
|
ld r24,-88(1)
|
|
ld r25,-80(1)
|
|
ld r26,-72(1)
|
|
ld r27,-64(1)
|
|
ld r28,-56(1)
|
|
ld r29,-48(1)
|
|
ld r30,-40(1)
|
|
ld r31,-32(1)
|
|
ld r3,-24(r1)
|
|
ld r4,-16(r1)
|
|
li r5,4096
|
|
b .Ldst_aligned
|
|
EXPORT_SYMBOL(__copy_tofrom_user)
|