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https://github.com/edk2-porting/linux-next.git
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dd78bc11fb
The "inv" (invalidate) instruction is generally less safe than "finv" (flush and invalidate), as it will drop dirty data from the cache. It turns out we have almost no need for "inv" (other than for the older 32-bit architecture in some limited cases), so convert to "finv" where possible and delete the extra "inv" infrastructure. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
129 lines
4.0 KiB
ArmAsm
129 lines
4.0 KiB
ArmAsm
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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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, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/linkage.h>
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#include <asm/errno.h>
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#include <asm/cache.h>
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#include <arch/chip.h>
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/* Access user memory, but use MMU to avoid propagating kernel exceptions. */
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/*
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* strnlen_user_asm takes the pointer in r0, and the length bound in r1.
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* It returns the length, including the terminating NUL, or zero on exception.
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* If length is greater than the bound, returns one plus the bound.
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*/
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STD_ENTRY(strnlen_user_asm)
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{ bz r1, 2f; addi r3, r0, -1 } /* bias down to include NUL */
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1: { lb_u r4, r0; addi r1, r1, -1 }
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bz r4, 2f
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{ bnzt r1, 1b; addi r0, r0, 1 }
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2: { sub r0, r0, r3; jrp lr }
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STD_ENDPROC(strnlen_user_asm)
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.pushsection .fixup,"ax"
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strnlen_user_fault:
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{ move r0, zero; jrp lr }
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ENDPROC(strnlen_user_fault)
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.section __ex_table,"a"
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.word 1b, strnlen_user_fault
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.popsection
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/*
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* strncpy_from_user_asm takes the kernel target pointer in r0,
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* the userspace source pointer in r1, and the length bound (including
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* the trailing NUL) in r2. On success, it returns the string length
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* (not including the trailing NUL), or -EFAULT on failure.
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*/
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STD_ENTRY(strncpy_from_user_asm)
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{ bz r2, 2f; move r3, r0 }
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1: { lb_u r4, r1; addi r1, r1, 1; addi r2, r2, -1 }
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{ sb r0, r4; addi r0, r0, 1 }
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bz r2, 2f
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bnzt r4, 1b
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addi r0, r0, -1 /* don't count the trailing NUL */
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2: { sub r0, r0, r3; jrp lr }
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STD_ENDPROC(strncpy_from_user_asm)
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.pushsection .fixup,"ax"
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strncpy_from_user_fault:
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{ movei r0, -EFAULT; jrp lr }
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ENDPROC(strncpy_from_user_fault)
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.section __ex_table,"a"
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.word 1b, strncpy_from_user_fault
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.popsection
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/*
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* clear_user_asm takes the user target address in r0 and the
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* number of bytes to zero in r1.
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* It returns the number of uncopiable bytes (hopefully zero) in r0.
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* Note that we don't use a separate .fixup section here since we fall
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* through into the "fixup" code as the last straight-line bundle anyway.
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*/
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STD_ENTRY(clear_user_asm)
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{ bz r1, 2f; or r2, r0, r1 }
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andi r2, r2, 3
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bzt r2, .Lclear_aligned_user_asm
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1: { sb r0, zero; addi r0, r0, 1; addi r1, r1, -1 }
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bnzt r1, 1b
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2: { move r0, r1; jrp lr }
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.pushsection __ex_table,"a"
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.word 1b, 2b
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.popsection
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.Lclear_aligned_user_asm:
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1: { sw r0, zero; addi r0, r0, 4; addi r1, r1, -4 }
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bnzt r1, 1b
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2: { move r0, r1; jrp lr }
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STD_ENDPROC(clear_user_asm)
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.pushsection __ex_table,"a"
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.word 1b, 2b
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.popsection
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/*
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* flush_user_asm takes the user target address in r0 and the
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* number of bytes to flush in r1.
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* It returns the number of unflushable bytes (hopefully zero) in r0.
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*/
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STD_ENTRY(flush_user_asm)
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bz r1, 2f
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{ movei r2, L2_CACHE_BYTES; add r1, r0, r1 }
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{ sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 }
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{ and r0, r0, r2; and r1, r1, r2 }
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{ sub r1, r1, r0 }
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1: { flush r0; addi r1, r1, -CHIP_FLUSH_STRIDE() }
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{ addi r0, r0, CHIP_FLUSH_STRIDE(); bnzt r1, 1b }
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2: { move r0, r1; jrp lr }
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STD_ENDPROC(flush_user_asm)
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.pushsection __ex_table,"a"
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.word 1b, 2b
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.popsection
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/*
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* finv_user_asm takes the user target address in r0 and the
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* number of bytes to flush-invalidate in r1.
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* It returns the number of not finv'able bytes (hopefully zero) in r0.
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*/
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STD_ENTRY(finv_user_asm)
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bz r1, 2f
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{ movei r2, L2_CACHE_BYTES; add r1, r0, r1 }
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{ sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 }
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{ and r0, r0, r2; and r1, r1, r2 }
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{ sub r1, r1, r0 }
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1: { finv r0; addi r1, r1, -CHIP_FINV_STRIDE() }
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{ addi r0, r0, CHIP_FINV_STRIDE(); bnzt r1, 1b }
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2: { move r0, r1; jrp lr }
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STD_ENDPROC(finv_user_asm)
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.pushsection __ex_table,"a"
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.word 1b, 2b
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.popsection
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