mirror of https://gitee.com/openkylin/linux.git
powerpc: fix __strnlen_user in merge tree
Change USER/KERNEL_DS so that the merged version of __strnlen_user can be used which allows us to complete the removal of arch/ppc64/lib/. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
Stephen Rothwell
parent
2df5e8bcca
commit
5015b49448
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@ -9,7 +9,7 @@ endif
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obj-y += strcase.o
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obj-$(CONFIG_PPC32) += div64.o copy_32.o checksum_32.o
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obj-$(CONFIG_PPC64) += checksum_64.o copypage_64.o copyuser_64.o \
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memcpy_64.o usercopy_64.o mem_64.o
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memcpy_64.o usercopy_64.o mem_64.o string.o
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obj-$(CONFIG_PPC_ISERIES) += e2a.o
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obj-$(CONFIG_XMON) += sstep.o
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@ -86,7 +86,6 @@ head-y := arch/ppc64/kernel/head.o
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head-y += arch/powerpc/kernel/fpu.o
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head-y += arch/powerpc/kernel/entry_64.o
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libs-y += arch/ppc64/lib/
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core-y += arch/ppc64/kernel/ arch/powerpc/kernel/
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core-y += arch/powerpc/mm/
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core-y += arch/powerpc/sysdev/
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@ -1,5 +0,0 @@
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#
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# Makefile for ppc64-specific library files..
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#
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lib-y := string.o
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@ -1,179 +0,0 @@
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/*
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* String handling functions for PowerPC.
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*
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* Copyright (C) 1996 Paul Mackerras.
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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/errno.h>
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#include <asm/ppc_asm.h>
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_GLOBAL(strcpy)
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r5)
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bne 1b
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blr
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_GLOBAL(strncpy)
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cmpwi 0,r5,0
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beqlr
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mtctr r5
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addi r6,r3,-1
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addi r4,r4,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r6)
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bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
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blr
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_GLOBAL(strcat)
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r0,1(r5)
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cmpwi 0,r0,0
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bne 1b
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addi r5,r5,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r5)
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bne 1b
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blr
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_GLOBAL(strcmp)
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r3,1(r5)
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cmpwi 1,r3,0
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lbzu r0,1(r4)
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subf. r3,r0,r3
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beqlr 1
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beq 1b
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blr
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_GLOBAL(strlen)
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addi r4,r3,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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bne 1b
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subf r3,r3,r4
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blr
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_GLOBAL(memcmp)
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cmpwi 0,r5,0
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ble- 2f
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mtctr r5
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addi r6,r3,-1
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addi r4,r4,-1
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1: lbzu r3,1(r6)
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lbzu r0,1(r4)
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subf. r3,r0,r3
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bdnzt 2,1b
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blr
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2: li r3,0
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blr
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_GLOBAL(memchr)
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cmpwi 0,r5,0
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ble- 2f
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mtctr r5
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addi r3,r3,-1
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1: lbzu r0,1(r3)
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cmpw 0,r0,r4
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bdnzf 2,1b
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beqlr
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2: li r3,0
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blr
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_GLOBAL(__clear_user)
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addi r6,r3,-4
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li r3,0
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li r5,0
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cmplwi 0,r4,4
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blt 7f
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/* clear a single word */
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11: stwu r5,4(r6)
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beqlr
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/* clear word sized chunks */
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andi. r0,r6,3
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add r4,r0,r4
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subf r6,r0,r6
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srwi r0,r4,2
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andi. r4,r4,3
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mtctr r0
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bdz 7f
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1: stwu r5,4(r6)
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bdnz 1b
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/* clear byte sized chunks */
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7: cmpwi 0,r4,0
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beqlr
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mtctr r4
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addi r6,r6,3
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8: stbu r5,1(r6)
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bdnz 8b
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blr
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90: mr r3,r4
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blr
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91: mfctr r3
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slwi r3,r3,2
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add r3,r3,r4
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blr
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92: mfctr r3
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blr
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.section __ex_table,"a"
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.align 3
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.llong 11b,90b
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.llong 1b,91b
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.llong 8b,92b
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.text
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/* r3 = dst, r4 = src, r5 = count */
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_GLOBAL(__strncpy_from_user)
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addi r6,r3,-1
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addi r4,r4,-1
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cmpwi 0,r5,0
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beq 2f
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mtctr r5
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r6)
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bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
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beq 3f
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2: addi r6,r6,1
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3: subf r3,r3,r6
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blr
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99: li r3,-EFAULT
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blr
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.section __ex_table,"a"
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.align 3
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.llong 1b,99b
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.text
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/* r3 = str, r4 = len (> 0) */
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_GLOBAL(__strnlen_user)
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addi r7,r3,-1
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mtctr r4 /* ctr = len */
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1: lbzu r0,1(r7) /* get next byte */
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cmpwi 0,r0,0
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bdnzf 2,1b /* loop if --ctr != 0 && byte != 0 */
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addi r7,r7,1
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subf r3,r3,r7 /* number of bytes we have looked at */
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beqlr /* return if we found a 0 byte */
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cmpw 0,r3,r4 /* did we look at all len bytes? */
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blt 99f /* if not, must have hit top */
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addi r3,r4,1 /* return len + 1 to indicate no null found */
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blr
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99: li r3,0 /* bad address, return 0 */
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blr
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.section __ex_table,"a"
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.align 3
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.llong 1b,99b
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@ -24,11 +24,11 @@
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#ifdef __powerpc64__
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#define KERNEL_DS MAKE_MM_SEG(0UL)
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#define USER_DS MAKE_MM_SEG(0xf000000000000000UL)
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#else
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#define KERNEL_DS MAKE_MM_SEG(~0UL)
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#ifdef __powerpc64__
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/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
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#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
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#else
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#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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#endif
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@ -40,22 +40,11 @@
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#ifdef __powerpc64__
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/*
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* Use the alpha trick for checking ranges:
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*
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* Is a address valid? This does a straightforward calculation rather
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* than tests.
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*
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* Address valid if:
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* - "addr" doesn't have any high-bits set
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* - AND "size" doesn't have any high-bits set
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* - OR we are in kernel mode.
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*
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* We dont have to check for high bits in (addr+size) because the first
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* two checks force the maximum result to be below the start of the
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* kernel region.
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* This check is sufficient because there is a large enough
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* gap between user addresses and the kernel addresses
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*/
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#define __access_ok(addr, size, segment) \
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(((segment).seg & (addr | size )) == 0)
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(((addr) <= (segment).seg) && ((size) <= (segment).seg))
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#else
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@ -161,7 +150,10 @@ extern long __put_user_bad(void);
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: "=r" (err) \
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: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
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#ifndef __powerpc64__
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#ifdef __powerpc64__
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#define __put_user_asm2(x, ptr, retval) \
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__put_user_asm(x, ptr, retval, "std")
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#else /* __powerpc64__ */
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#define __put_user_asm2(x, addr, err) \
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__asm__ __volatile__( \
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"1: stw %1,0(%2)\n" \
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@ -178,9 +170,6 @@ extern long __put_user_bad(void);
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".previous" \
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: "=r" (err) \
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: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
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#else /* __powerpc64__ */
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#define __put_user_asm2(x, ptr, retval) \
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__put_user_asm(x, ptr, retval, "std")
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#endif /* __powerpc64__ */
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#define __put_user_size(x, ptr, size, retval) \
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@ -218,7 +207,7 @@ extern long __get_user_bad(void);
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#define __get_user_asm(x, addr, err, op) \
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__asm__ __volatile__( \
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"1: "op" %1,0(%2) # get_user\n" \
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"1: "op" %1,0(%2) # get_user\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: li %0,%3\n" \
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@ -232,8 +221,11 @@ extern long __get_user_bad(void);
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: "=r" (err), "=r" (x) \
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: "b" (addr), "i" (-EFAULT), "0" (err))
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#ifndef __powerpc64__
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#define __get_user_asm2(x, addr, err) \
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#ifdef __powerpc64__
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#define __get_user_asm2(x, addr, err) \
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__get_user_asm(x, addr, err, "ld")
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#else /* __powerpc64__ */
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#define __get_user_asm2(x, addr, err) \
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__asm__ __volatile__( \
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"1: lwz %1,0(%2)\n" \
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"2: lwz %1+1,4(%2)\n" \
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@ -251,17 +243,14 @@ extern long __get_user_bad(void);
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".previous" \
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: "=r" (err), "=&r" (x) \
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: "b" (addr), "i" (-EFAULT), "0" (err))
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#else
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#define __get_user_asm2(x, addr, err) \
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__get_user_asm(x, addr, err, "ld")
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#endif /* __powerpc64__ */
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#define __get_user_size(x, ptr, size, retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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if (size > sizeof(x)) \
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(x) = __get_user_bad(); \
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if (size > sizeof(x)) \
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(x) = __get_user_bad(); \
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switch (size) { \
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case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
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case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
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@ -300,7 +289,7 @@ do { \
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long __gu_err = -EFAULT; \
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unsigned long __gu_val = 0; \
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const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
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might_sleep(); \
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might_sleep(); \
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if (access_ok(VERIFY_READ, __gu_addr, (size))) \
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__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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@ -313,8 +302,9 @@ extern unsigned long __copy_tofrom_user(void __user *to,
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const void __user *from, unsigned long size);
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#ifndef __powerpc64__
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extern inline unsigned long
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copy_from_user(void *to, const void __user *from, unsigned long n)
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extern inline unsigned long copy_from_user(void *to,
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const void __user *from, unsigned long n)
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{
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unsigned long over;
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@ -328,8 +318,8 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
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return n;
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}
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extern inline unsigned long
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copy_to_user(void __user *to, const void *from, unsigned long n)
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extern inline unsigned long copy_to_user(void __user *to,
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const void *from, unsigned long n)
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{
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unsigned long over;
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@ -343,10 +333,23 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
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return n;
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}
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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#else /* __powerpc64__ */
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static inline unsigned long
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__copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
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#define __copy_in_user(to, from, size) \
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__copy_tofrom_user((to), (from), (size))
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extern unsigned long copy_from_user(void *to, const void __user *from,
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unsigned long n);
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extern unsigned long copy_to_user(void __user *to, const void *from,
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unsigned long n);
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extern unsigned long copy_in_user(void __user *to, const void __user *from,
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unsigned long n);
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static inline unsigned long __copy_from_user_inatomic(void *to,
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const void __user *from, unsigned long n)
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{
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if (__builtin_constant_p(n) && (n <= 8)) {
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unsigned long ret;
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@ -370,8 +373,8 @@ __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
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return __copy_tofrom_user((__force void __user *) to, from, n);
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}
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static inline unsigned long
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__copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
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static inline unsigned long __copy_to_user_inatomic(void __user *to,
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const void *from, unsigned long n)
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{
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if (__builtin_constant_p(n) && (n <= 8)) {
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unsigned long ret;
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@ -397,8 +400,8 @@ __copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
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#endif /* __powerpc64__ */
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static inline unsigned long
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__copy_from_user(void *to, const void __user *from, unsigned long size)
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static inline unsigned long __copy_from_user(void *to,
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const void __user *from, unsigned long size)
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{
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might_sleep();
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#ifndef __powerpc64__
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@ -408,8 +411,8 @@ __copy_from_user(void *to, const void __user *from, unsigned long size)
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#endif /* __powerpc64__ */
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}
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static inline unsigned long
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__copy_to_user(void __user *to, const void *from, unsigned long size)
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static inline unsigned long __copy_to_user(void __user *to,
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const void *from, unsigned long size)
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{
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might_sleep();
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#ifndef __powerpc64__
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@ -419,21 +422,6 @@ __copy_to_user(void __user *to, const void *from, unsigned long size)
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#endif /* __powerpc64__ */
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}
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#ifndef __powerpc64__
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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#else /* __powerpc64__ */
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#define __copy_in_user(to, from, size) \
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__copy_tofrom_user((to), (from), (size))
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extern unsigned long copy_from_user(void *to, const void __user *from,
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unsigned long n);
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extern unsigned long copy_to_user(void __user *to, const void *from,
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unsigned long n);
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extern unsigned long copy_in_user(void __user *to, const void __user *from,
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unsigned long n);
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#endif /* __powerpc64__ */
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extern unsigned long __clear_user(void __user *addr, unsigned long size);
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static inline unsigned long clear_user(void __user *addr, unsigned long size)
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@ -466,11 +454,7 @@ static inline long strncpy_from_user(char *dst, const char __user *src,
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*
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* Return 0 for error
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*/
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#ifndef __powerpc64__
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extern int __strnlen_user(const char __user *str, long len, unsigned long top);
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#else /* __powerpc64__ */
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extern int __strnlen_user(const char __user *str, long len);
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#endif /* __powerpc64__ */
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/*
|
||||
* Returns the length of the string at str (including the null byte),
|
||||
|
|
@ -482,18 +466,11 @@ extern int __strnlen_user(const char __user *str, long len);
|
|||
*/
|
||||
static inline int strnlen_user(const char __user *str, long len)
|
||||
{
|
||||
#ifndef __powerpc64__
|
||||
unsigned long top = current->thread.fs.seg;
|
||||
|
||||
if ((unsigned long)str > top)
|
||||
return 0;
|
||||
return __strnlen_user(str, len, top);
|
||||
#else /* __powerpc64__ */
|
||||
might_sleep();
|
||||
if (likely(access_ok(VERIFY_READ, str, 1)))
|
||||
return __strnlen_user(str, len);
|
||||
return 0;
|
||||
#endif /* __powerpc64__ */
|
||||
}
|
||||
|
||||
#define strlen_user(str) strnlen_user((str), 0x7ffffffe)
|
||||
|
|
|
|||
Loading…
Reference in New Issue