+++ /dev/null
-/*
- * linux/arch/arm26/lib/uaccess-user.S
- *
- * Copyright (C) 1995, 1996,1997,1998 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Routines to block copy data to/from user memory
- * These are highly optimised both for the 4k page size
- * and for various alignments.
- */
-#include <linux/linkage.h>
-#include <asm/assembler.h>
-#include <asm/errno.h>
-#include <asm/page.h>
-
- .text
-
-//FIXME - surely this can be done in C not asm, removing the problem of keeping C and asm in sync? (this is a struct uaccess_t)
- .globl uaccess_user
-uaccess_user:
- .word uaccess_user_put_byte
- .word uaccess_user_get_byte
- .word uaccess_user_put_half
- .word uaccess_user_get_half
- .word uaccess_user_put_word
- .word uaccess_user_get_word
- .word uaccess_user_put_dword
- .word uaccess_user_copy_from_user
- .word uaccess_user_copy_to_user
- .word uaccess_user_clear_user
- .word uaccess_user_strncpy_from_user
- .word uaccess_user_strnlen_user
-
-
-@ In : r0 = x, r1 = addr, r2 = error
-@ Out: r2 = error
-uaccess_user_put_byte:
- stmfd sp!, {lr}
-USER( strbt r0, [r1])
- ldmfd sp!, {pc}^
-
-@ In : r0 = x, r1 = addr, r2 = error
-@ Out: r2 = error
-uaccess_user_put_half:
- stmfd sp!, {lr}
-USER( strbt r0, [r1], #1)
- mov r0, r0, lsr #8
-USER( strbt r0, [r1])
- ldmfd sp!, {pc}^
-
-@ In : r0 = x, r1 = addr, r2 = error
-@ Out: r2 = error
-uaccess_user_put_word:
- stmfd sp!, {lr}
-USER( strt r0, [r1])
- ldmfd sp!, {pc}^
-
-@ In : r0 = x, r1 = addr, r2 = error
-@ Out: r2 = error
-uaccess_user_put_dword:
- stmfd sp!, {lr}
-USER( strt r0, [r1], #4)
-USER( strt r0, [r1], #0)
- ldmfd sp!, {pc}^
-
-9001: mov r2, #-EFAULT
- ldmfd sp!, {pc}^
-
-
-@ In : r0 = addr, r1 = error
-@ Out: r0 = x, r1 = error
-uaccess_user_get_byte:
- stmfd sp!, {lr}
-USER( ldrbt r0, [r0])
- ldmfd sp!, {pc}^
-
-@ In : r0 = addr, r1 = error
-@ Out: r0 = x, r1 = error
-uaccess_user_get_half:
- stmfd sp!, {lr}
-USER( ldrt r0, [r0])
- mov r0, r0, lsl #16
- mov r0, r0, lsr #16
- ldmfd sp!, {pc}^
-
-@ In : r0 = addr, r1 = error
-@ Out: r0 = x, r1 = error
-uaccess_user_get_word:
- stmfd sp!, {lr}
-USER( ldrt r0, [r0])
- ldmfd sp!, {pc}^
-
-9001: mov r1, #-EFAULT
- ldmfd sp!, {pc}^
-
-/* Prototype: int uaccess_user_copy_to_user(void *to, const char *from, size_t n)
- * Purpose : copy a block to user memory from kernel memory
- * Params : to - user memory
- * : from - kernel memory
- * : n - number of bytes to copy
- * Returns : Number of bytes NOT copied.
- */
-
-.c2u_dest_not_aligned:
- rsb ip, ip, #4
- cmp ip, #2
- ldrb r3, [r1], #1
-USER( strbt r3, [r0], #1) @ May fault
- ldrgeb r3, [r1], #1
-USER( strgebt r3, [r0], #1) @ May fault
- ldrgtb r3, [r1], #1
-USER( strgtbt r3, [r0], #1) @ May fault
- sub r2, r2, ip
- b .c2u_dest_aligned
-
-ENTRY(uaccess_user_copy_to_user)
- stmfd sp!, {r2, r4 - r7, lr}
- cmp r2, #4
- blt .c2u_not_enough
- ands ip, r0, #3
- bne .c2u_dest_not_aligned
-.c2u_dest_aligned:
-
- ands ip, r1, #3
- bne .c2u_src_not_aligned
-/*
- * Seeing as there has to be at least 8 bytes to copy, we can
- * copy one word, and force a user-mode page fault...
- */
-
-.c2u_0fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .c2u_0nowords
- ldr r3, [r1], #4
-USER( strt r3, [r0], #4) @ May fault
- mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .c2u_0fupi
-/*
- * ip = max no. of bytes to copy before needing another "strt" insn
- */
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #32
- blt .c2u_0rem8lp
-
-.c2u_0cpy8lp: ldmia r1!, {r3 - r6}
- stmia r0!, {r3 - r6} @ Shouldnt fault
- ldmia r1!, {r3 - r6}
- stmia r0!, {r3 - r6} @ Shouldnt fault
- subs ip, ip, #32
- bpl .c2u_0cpy8lp
-.c2u_0rem8lp: cmn ip, #16
- ldmgeia r1!, {r3 - r6}
- stmgeia r0!, {r3 - r6} @ Shouldnt fault
- tst ip, #8
- ldmneia r1!, {r3 - r4}
- stmneia r0!, {r3 - r4} @ Shouldnt fault
- tst ip, #4
- ldrne r3, [r1], #4
- strnet r3, [r0], #4 @ Shouldnt fault
- ands ip, ip, #3
- beq .c2u_0fupi
-.c2u_0nowords: teq ip, #0
- beq .c2u_finished
-.c2u_nowords: cmp ip, #2
- ldrb r3, [r1], #1
-USER( strbt r3, [r0], #1) @ May fault
- ldrgeb r3, [r1], #1
-USER( strgebt r3, [r0], #1) @ May fault
- ldrgtb r3, [r1], #1
-USER( strgtbt r3, [r0], #1) @ May fault
- b .c2u_finished
-
-.c2u_not_enough:
- movs ip, r2
- bne .c2u_nowords
-.c2u_finished: mov r0, #0
- LOADREGS(fd,sp!,{r2, r4 - r7, pc})
-
-.c2u_src_not_aligned:
- bic r1, r1, #3
- ldr r7, [r1], #4
- cmp ip, #2
- bgt .c2u_3fupi
- beq .c2u_2fupi
-.c2u_1fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .c2u_1nowords
- mov r3, r7, pull #8
- ldr r7, [r1], #4
- orr r3, r3, r7, push #24
-USER( strt r3, [r0], #4) @ May fault
- mov ip, r0, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .c2u_1fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .c2u_1rem8lp
-
-.c2u_1cpy8lp: mov r3, r7, pull #8
- ldmia r1!, {r4 - r7}
- orr r3, r3, r4, push #24
- mov r4, r4, pull #8
- orr r4, r4, r5, push #24
- mov r5, r5, pull #8
- orr r5, r5, r6, push #24
- mov r6, r6, pull #8
- orr r6, r6, r7, push #24
- stmia r0!, {r3 - r6} @ Shouldnt fault
- subs ip, ip, #16
- bpl .c2u_1cpy8lp
-.c2u_1rem8lp: tst ip, #8
- movne r3, r7, pull #8
- ldmneia r1!, {r4, r7}
- orrne r3, r3, r4, push #24
- movne r4, r4, pull #8
- orrne r4, r4, r7, push #24
- stmneia r0!, {r3 - r4} @ Shouldnt fault
- tst ip, #4
- movne r3, r7, pull #8
- ldrne r7, [r1], #4
- orrne r3, r3, r7, push #24
- strnet r3, [r0], #4 @ Shouldnt fault
- ands ip, ip, #3
- beq .c2u_1fupi
-.c2u_1nowords: mov r3, r7, lsr #byte(1)
- teq ip, #0
- beq .c2u_finished
- cmp ip, #2
-USER( strbt r3, [r0], #1) @ May fault
- movge r3, r7, lsr #byte(2)
-USER( strgebt r3, [r0], #1) @ May fault
- movgt r3, r7, lsr #byte(3)
-USER( strgtbt r3, [r0], #1) @ May fault
- b .c2u_finished
-
-.c2u_2fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .c2u_2nowords
- mov r3, r7, pull #16
- ldr r7, [r1], #4
- orr r3, r3, r7, push #16
-USER( strt r3, [r0], #4) @ May fault
- mov ip, r0, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .c2u_2fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .c2u_2rem8lp
-
-.c2u_2cpy8lp: mov r3, r7, pull #16
- ldmia r1!, {r4 - r7}
- orr r3, r3, r4, push #16
- mov r4, r4, pull #16
- orr r4, r4, r5, push #16
- mov r5, r5, pull #16
- orr r5, r5, r6, push #16
- mov r6, r6, pull #16
- orr r6, r6, r7, push #16
- stmia r0!, {r3 - r6} @ Shouldnt fault
- subs ip, ip, #16
- bpl .c2u_2cpy8lp
-.c2u_2rem8lp: tst ip, #8
- movne r3, r7, pull #16
- ldmneia r1!, {r4, r7}
- orrne r3, r3, r4, push #16
- movne r4, r4, pull #16
- orrne r4, r4, r7, push #16
- stmneia r0!, {r3 - r4} @ Shouldnt fault
- tst ip, #4
- movne r3, r7, pull #16
- ldrne r7, [r1], #4
- orrne r3, r3, r7, push #16
- strnet r3, [r0], #4 @ Shouldnt fault
- ands ip, ip, #3
- beq .c2u_2fupi
-.c2u_2nowords: mov r3, r7, lsr #byte(2)
- teq ip, #0
- beq .c2u_finished
- cmp ip, #2
-USER( strbt r3, [r0], #1) @ May fault
- movge r3, r7, lsr #byte(3)
-USER( strgebt r3, [r0], #1) @ May fault
- ldrgtb r3, [r1], #0
-USER( strgtbt r3, [r0], #1) @ May fault
- b .c2u_finished
-
-.c2u_3fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .c2u_3nowords
- mov r3, r7, pull #24
- ldr r7, [r1], #4
- orr r3, r3, r7, push #8
-USER( strt r3, [r0], #4) @ May fault
- mov ip, r0, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .c2u_3fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .c2u_3rem8lp
-
-.c2u_3cpy8lp: mov r3, r7, pull #24
- ldmia r1!, {r4 - r7}
- orr r3, r3, r4, push #8
- mov r4, r4, pull #24
- orr r4, r4, r5, push #8
- mov r5, r5, pull #24
- orr r5, r5, r6, push #8
- mov r6, r6, pull #24
- orr r6, r6, r7, push #8
- stmia r0!, {r3 - r6} @ Shouldnt fault
- subs ip, ip, #16
- bpl .c2u_3cpy8lp
-.c2u_3rem8lp: tst ip, #8
- movne r3, r7, pull #24
- ldmneia r1!, {r4, r7}
- orrne r3, r3, r4, push #8
- movne r4, r4, pull #24
- orrne r4, r4, r7, push #8
- stmneia r0!, {r3 - r4} @ Shouldnt fault
- tst ip, #4
- movne r3, r7, pull #24
- ldrne r7, [r1], #4
- orrne r3, r3, r7, push #8
- strnet r3, [r0], #4 @ Shouldnt fault
- ands ip, ip, #3
- beq .c2u_3fupi
-.c2u_3nowords: mov r3, r7, lsr #byte(3)
- teq ip, #0
- beq .c2u_finished
- cmp ip, #2
-USER( strbt r3, [r0], #1) @ May fault
- ldrgeb r3, [r1], #1
-USER( strgebt r3, [r0], #1) @ May fault
- ldrgtb r3, [r1], #0
-USER( strgtbt r3, [r0], #1) @ May fault
- b .c2u_finished
-
- .section .fixup,"ax"
- .align 0
-9001: LOADREGS(fd,sp!, {r0, r4 - r7, pc})
- .previous
-
-/* Prototype: unsigned long uaccess_user_copy_from_user(void *to,const void *from,unsigned long n);
- * Purpose : copy a block from user memory to kernel memory
- * Params : to - kernel memory
- * : from - user memory
- * : n - number of bytes to copy
- * Returns : Number of bytes NOT copied.
- */
-.cfu_dest_not_aligned:
- rsb ip, ip, #4
- cmp ip, #2
-USER( ldrbt r3, [r1], #1) @ May fault
- strb r3, [r0], #1
-USER( ldrgebt r3, [r1], #1) @ May fault
- strgeb r3, [r0], #1
-USER( ldrgtbt r3, [r1], #1) @ May fault
- strgtb r3, [r0], #1
- sub r2, r2, ip
- b .cfu_dest_aligned
-
-ENTRY(uaccess_user_copy_from_user)
- stmfd sp!, {r0, r2, r4 - r7, lr}
- cmp r2, #4
- blt .cfu_not_enough
- ands ip, r0, #3
- bne .cfu_dest_not_aligned
-.cfu_dest_aligned:
- ands ip, r1, #3
- bne .cfu_src_not_aligned
-/*
- * Seeing as there has to be at least 8 bytes to copy, we can
- * copy one word, and force a user-mode page fault...
- */
-
-.cfu_0fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .cfu_0nowords
-USER( ldrt r3, [r1], #4)
- str r3, [r0], #4
- mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .cfu_0fupi
-/*
- * ip = max no. of bytes to copy before needing another "strt" insn
- */
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #32
- blt .cfu_0rem8lp
-
-.cfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault
- stmia r0!, {r3 - r6}
- ldmia r1!, {r3 - r6} @ Shouldnt fault
- stmia r0!, {r3 - r6}
- subs ip, ip, #32
- bpl .cfu_0cpy8lp
-.cfu_0rem8lp: cmn ip, #16
- ldmgeia r1!, {r3 - r6} @ Shouldnt fault
- stmgeia r0!, {r3 - r6}
- tst ip, #8
- ldmneia r1!, {r3 - r4} @ Shouldnt fault
- stmneia r0!, {r3 - r4}
- tst ip, #4
- ldrnet r3, [r1], #4 @ Shouldnt fault
- strne r3, [r0], #4
- ands ip, ip, #3
- beq .cfu_0fupi
-.cfu_0nowords: teq ip, #0
- beq .cfu_finished
-.cfu_nowords: cmp ip, #2
-USER( ldrbt r3, [r1], #1) @ May fault
- strb r3, [r0], #1
-USER( ldrgebt r3, [r1], #1) @ May fault
- strgeb r3, [r0], #1
-USER( ldrgtbt r3, [r1], #1) @ May fault
- strgtb r3, [r0], #1
- b .cfu_finished
-
-.cfu_not_enough:
- movs ip, r2
- bne .cfu_nowords
-.cfu_finished: mov r0, #0
- add sp, sp, #8
- LOADREGS(fd,sp!,{r4 - r7, pc})
-
-.cfu_src_not_aligned:
- bic r1, r1, #3
-USER( ldrt r7, [r1], #4) @ May fault
- cmp ip, #2
- bgt .cfu_3fupi
- beq .cfu_2fupi
-.cfu_1fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .cfu_1nowords
- mov r3, r7, pull #8
-USER( ldrt r7, [r1], #4) @ May fault
- orr r3, r3, r7, push #24
- str r3, [r0], #4
- mov ip, r1, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .cfu_1fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .cfu_1rem8lp
-
-.cfu_1cpy8lp: mov r3, r7, pull #8
- ldmia r1!, {r4 - r7} @ Shouldnt fault
- orr r3, r3, r4, push #24
- mov r4, r4, pull #8
- orr r4, r4, r5, push #24
- mov r5, r5, pull #8
- orr r5, r5, r6, push #24
- mov r6, r6, pull #8
- orr r6, r6, r7, push #24
- stmia r0!, {r3 - r6}
- subs ip, ip, #16
- bpl .cfu_1cpy8lp
-.cfu_1rem8lp: tst ip, #8
- movne r3, r7, pull #8
- ldmneia r1!, {r4, r7} @ Shouldnt fault
- orrne r3, r3, r4, push #24
- movne r4, r4, pull #8
- orrne r4, r4, r7, push #24
- stmneia r0!, {r3 - r4}
- tst ip, #4
- movne r3, r7, pull #8
-USER( ldrnet r7, [r1], #4) @ May fault
- orrne r3, r3, r7, push #24
- strne r3, [r0], #4
- ands ip, ip, #3
- beq .cfu_1fupi
-.cfu_1nowords: mov r3, r7, lsr #byte(1)
- teq ip, #0
- beq .cfu_finished
- cmp ip, #2
- strb r3, [r0], #1
- movge r3, r7, lsr #byte(2)
- strgeb r3, [r0], #1
- movgt r3, r7, lsr #byte(3)
- strgtb r3, [r0], #1
- b .cfu_finished
-
-.cfu_2fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .cfu_2nowords
- mov r3, r7, pull #16
-USER( ldrt r7, [r1], #4) @ May fault
- orr r3, r3, r7, push #16
- str r3, [r0], #4
- mov ip, r1, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .cfu_2fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .cfu_2rem8lp
-
-.cfu_2cpy8lp: mov r3, r7, pull #16
- ldmia r1!, {r4 - r7} @ Shouldnt fault
- orr r3, r3, r4, push #16
- mov r4, r4, pull #16
- orr r4, r4, r5, push #16
- mov r5, r5, pull #16
- orr r5, r5, r6, push #16
- mov r6, r6, pull #16
- orr r6, r6, r7, push #16
- stmia r0!, {r3 - r6}
- subs ip, ip, #16
- bpl .cfu_2cpy8lp
-.cfu_2rem8lp: tst ip, #8
- movne r3, r7, pull #16
- ldmneia r1!, {r4, r7} @ Shouldnt fault
- orrne r3, r3, r4, push #16
- movne r4, r4, pull #16
- orrne r4, r4, r7, push #16
- stmneia r0!, {r3 - r4}
- tst ip, #4
- movne r3, r7, pull #16
-USER( ldrnet r7, [r1], #4) @ May fault
- orrne r3, r3, r7, push #16
- strne r3, [r0], #4
- ands ip, ip, #3
- beq .cfu_2fupi
-.cfu_2nowords: mov r3, r7, lsr #byte(2)
- teq ip, #0
- beq .cfu_finished
- cmp ip, #2
- strb r3, [r0], #1
- movge r3, r7, lsr #byte(3)
- strgeb r3, [r0], #1
-USER( ldrgtbt r3, [r1], #0) @ May fault
- strgtb r3, [r0], #1
- b .cfu_finished
-
-.cfu_3fupi: subs r2, r2, #4
- addmi ip, r2, #4
- bmi .cfu_3nowords
- mov r3, r7, pull #24
-USER( ldrt r7, [r1], #4) @ May fault
- orr r3, r3, r7, push #8
- str r3, [r0], #4
- mov ip, r1, lsl #32 - PAGE_SHIFT
- rsb ip, ip, #0
- movs ip, ip, lsr #32 - PAGE_SHIFT
- beq .cfu_3fupi
- cmp r2, ip
- movlt ip, r2
- sub r2, r2, ip
- subs ip, ip, #16
- blt .cfu_3rem8lp
-
-.cfu_3cpy8lp: mov r3, r7, pull #24
- ldmia r1!, {r4 - r7} @ Shouldnt fault
- orr r3, r3, r4, push #8
- mov r4, r4, pull #24
- orr r4, r4, r5, push #8
- mov r5, r5, pull #24
- orr r5, r5, r6, push #8
- mov r6, r6, pull #24
- orr r6, r6, r7, push #8
- stmia r0!, {r3 - r6}
- subs ip, ip, #16
- bpl .cfu_3cpy8lp
-.cfu_3rem8lp: tst ip, #8
- movne r3, r7, pull #24
- ldmneia r1!, {r4, r7} @ Shouldnt fault
- orrne r3, r3, r4, push #8
- movne r4, r4, pull #24
- orrne r4, r4, r7, push #8
- stmneia r0!, {r3 - r4}
- tst ip, #4
- movne r3, r7, pull #24
-USER( ldrnet r7, [r1], #4) @ May fault
- orrne r3, r3, r7, push #8
- strne r3, [r0], #4
- ands ip, ip, #3
- beq .cfu_3fupi
-.cfu_3nowords: mov r3, r7, lsr #byte(3)
- teq ip, #0
- beq .cfu_finished
- cmp ip, #2
- strb r3, [r0], #1
-USER( ldrgebt r3, [r1], #1) @ May fault
- strgeb r3, [r0], #1
-USER( ldrgtbt r3, [r1], #1) @ May fault
- strgtb r3, [r0], #1
- b .cfu_finished
-
- .section .fixup,"ax"
- .align 0
- /*
- * We took an exception. r0 contains a pointer to
- * the byte not copied.
- */
-9001: ldr r2, [sp], #4 @ void *to
- sub r2, r0, r2 @ bytes copied
- ldr r1, [sp], #4 @ unsigned long count
- subs r4, r1, r2 @ bytes left to copy
- movne r1, r4
- blne __memzero
- mov r0, r4
- LOADREGS(fd,sp!, {r4 - r7, pc})
- .previous
-
-/* Prototype: int uaccess_user_clear_user(void *addr, size_t sz)
- * Purpose : clear some user memory
- * Params : addr - user memory address to clear
- * : sz - number of bytes to clear
- * Returns : number of bytes NOT cleared
- */
-ENTRY(uaccess_user_clear_user)
- stmfd sp!, {r1, lr}
- mov r2, #0
- cmp r1, #4
- blt 2f
- ands ip, r0, #3
- beq 1f
- cmp ip, #2
-USER( strbt r2, [r0], #1)
-USER( strlebt r2, [r0], #1)
-USER( strltbt r2, [r0], #1)
- rsb ip, ip, #4
- sub r1, r1, ip @ 7 6 5 4 3 2 1
-1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7
-USER( strplt r2, [r0], #4)
-USER( strplt r2, [r0], #4)
- bpl 1b
- adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3
-USER( strplt r2, [r0], #4)
-2: tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x
-USER( strnebt r2, [r0], #1)
-USER( strnebt r2, [r0], #1)
- tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1
-USER( strnebt r2, [r0], #1)
- mov r0, #0
- LOADREGS(fd,sp!, {r1, pc})
-
- .section .fixup,"ax"
- .align 0
-9001: LOADREGS(fd,sp!, {r0, pc})
- .previous
-
-/*
- * Copy a string from user space to kernel space.
- * r0 = dst, r1 = src, r2 = byte length
- * returns the number of characters copied (strlen of copied string),
- * -EFAULT on exception, or "len" if we fill the whole buffer
- */
-ENTRY(uaccess_user_strncpy_from_user)
- save_lr
- mov ip, r1
-1: subs r2, r2, #1
-USER( ldrplbt r3, [r1], #1)
- bmi 2f
- strb r3, [r0], #1
- teq r3, #0
- bne 1b
- sub r1, r1, #1 @ take NUL character out of count
-2: sub r0, r1, ip
- restore_pc
-
- .section .fixup,"ax"
- .align 0
-9001: mov r3, #0
- strb r3, [r0, #0] @ null terminate
- mov r0, #-EFAULT
- restore_pc
- .previous
-
-/* Prototype: unsigned long uaccess_user_strnlen_user(const char *str, long n)
- * Purpose : get length of a string in user memory
- * Params : str - address of string in user memory
- * Returns : length of string *including terminator*
- * or zero on exception, or n + 1 if too long
- */
-ENTRY(uaccess_user_strnlen_user)
- save_lr
- mov r2, r0
-1:
-USER( ldrbt r3, [r0], #1)
- teq r3, #0
- beq 2f
- subs r1, r1, #1
- bne 1b
- add r0, r0, #1
-2: sub r0, r0, r2
- restore_pc
-
- .section .fixup,"ax"
- .align 0
-9001: mov r0, #0
- restore_pc
- .previous
-
git.openpandora.org / pandora-kernel.git / blobdiff