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130 lines
2.5 KiB
130 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/copy_from_user.S |
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* |
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* Author: Nicolas Pitre |
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* Created: Sep 29, 2005 |
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* Copyright: MontaVista Software, Inc. |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include <asm/unwind.h> |
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/* |
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* Prototype: |
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* |
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* size_t arm_copy_from_user(void *to, const void *from, size_t n) |
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* |
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* Purpose: |
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* |
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* copy a block to kernel memory from user memory |
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* |
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* Params: |
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* |
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* to = kernel memory |
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* from = user memory |
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* n = number of bytes to copy |
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* |
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* Return value: |
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* |
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* Number of bytes NOT copied. |
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*/ |
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#ifdef CONFIG_CPU_USE_DOMAINS |
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#ifndef CONFIG_THUMB2_KERNEL |
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#define LDR1W_SHIFT 0 |
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#else |
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#define LDR1W_SHIFT 1 |
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#endif |
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.macro ldr1w ptr reg abort |
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ldrusr \reg, \ptr, 4, abort=\abort |
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.endm |
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort |
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ldr1w \ptr, \reg1, \abort |
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ldr1w \ptr, \reg2, \abort |
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ldr1w \ptr, \reg3, \abort |
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ldr1w \ptr, \reg4, \abort |
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.endm |
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.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort |
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ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort |
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ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort |
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.endm |
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#else |
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#define LDR1W_SHIFT 0 |
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.macro ldr1w ptr reg abort |
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USERL(\abort, W(ldr) \reg, [\ptr], #4) |
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.endm |
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort |
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USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}) |
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.endm |
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.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort |
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USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}) |
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.endm |
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#endif /* CONFIG_CPU_USE_DOMAINS */ |
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.macro ldr1b ptr reg cond=al abort |
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ldrusr \reg, \ptr, 1, \cond, abort=\abort |
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.endm |
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#define STR1W_SHIFT 0 |
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.macro str1w ptr reg abort |
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W(str) \reg, [\ptr], #4 |
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.endm |
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.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort |
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stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8} |
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.endm |
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.macro str1b ptr reg cond=al abort |
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strb\cond \reg, [\ptr], #1 |
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.endm |
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.macro enter reg1 reg2 |
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mov r3, #0 |
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stmdb sp!, {r0, r2, r3, \reg1, \reg2} |
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.endm |
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.macro usave reg1 reg2 |
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UNWIND( .save {r0, r2, r3, \reg1, \reg2} ) |
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.endm |
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.macro exit reg1 reg2 |
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add sp, sp, #8 |
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ldmfd sp!, {r0, \reg1, \reg2} |
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.endm |
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.text |
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ENTRY(__copy_from_user_std) |
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WEAK(arm_copy_from_user) |
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#ifdef CONFIG_CPU_SPECTRE |
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ldr r3, =TASK_SIZE |
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uaccess_mask_range_ptr r1, r2, r3, ip |
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#endif |
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#include "copy_template.S" |
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ENDPROC(arm_copy_from_user) |
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ENDPROC(__copy_from_user_std) |
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.pushsection .text.fixup,"ax" |
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.align 0 |
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copy_abort_preamble |
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ldmfd sp!, {r1, r2, r3} |
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sub r0, r0, r1 |
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rsb r0, r0, r2 |
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copy_abort_end |
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.popsection |
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