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118 lines
2.7 KiB
118 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* __put_user functions. |
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* |
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* (C) Copyright 2005 Linus Torvalds |
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* (C) Copyright 2005 Andi Kleen |
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* (C) Copyright 2008 Glauber Costa |
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* |
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* These functions have a non-standard call interface |
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* to make them more efficient, especially as they |
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* return an error value in addition to the "real" |
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* return value. |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/thread_info.h> |
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#include <asm/errno.h> |
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#include <asm/asm.h> |
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#include <asm/smap.h> |
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#include <asm/export.h> |
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/* |
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* __put_user_X |
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* |
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* Inputs: %eax[:%edx] contains the data |
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* %ecx contains the address |
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* |
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* Outputs: %ecx is error code (0 or -EFAULT) |
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* |
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* Clobbers: %ebx needed for task pointer |
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* |
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* These functions should not modify any other registers, |
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* as they get called from within inline assembly. |
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*/ |
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#ifdef CONFIG_X86_5LEVEL |
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#define LOAD_TASK_SIZE_MINUS_N(n) \ |
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ALTERNATIVE __stringify(mov $((1 << 47) - 4096 - (n)),%rbx), \ |
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__stringify(mov $((1 << 56) - 4096 - (n)),%rbx), X86_FEATURE_LA57 |
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#else |
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#define LOAD_TASK_SIZE_MINUS_N(n) \ |
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mov $(TASK_SIZE_MAX - (n)),%_ASM_BX |
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#endif |
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.text |
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SYM_FUNC_START(__put_user_1) |
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LOAD_TASK_SIZE_MINUS_N(0) |
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cmp %_ASM_BX,%_ASM_CX |
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jae .Lbad_put_user |
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SYM_INNER_LABEL(__put_user_nocheck_1, SYM_L_GLOBAL) |
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ASM_STAC |
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1: movb %al,(%_ASM_CX) |
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xor %ecx,%ecx |
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ASM_CLAC |
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ret |
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SYM_FUNC_END(__put_user_1) |
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EXPORT_SYMBOL(__put_user_1) |
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EXPORT_SYMBOL(__put_user_nocheck_1) |
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SYM_FUNC_START(__put_user_2) |
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LOAD_TASK_SIZE_MINUS_N(1) |
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cmp %_ASM_BX,%_ASM_CX |
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jae .Lbad_put_user |
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SYM_INNER_LABEL(__put_user_nocheck_2, SYM_L_GLOBAL) |
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ASM_STAC |
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2: movw %ax,(%_ASM_CX) |
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xor %ecx,%ecx |
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ASM_CLAC |
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ret |
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SYM_FUNC_END(__put_user_2) |
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EXPORT_SYMBOL(__put_user_2) |
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EXPORT_SYMBOL(__put_user_nocheck_2) |
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SYM_FUNC_START(__put_user_4) |
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LOAD_TASK_SIZE_MINUS_N(3) |
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cmp %_ASM_BX,%_ASM_CX |
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jae .Lbad_put_user |
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SYM_INNER_LABEL(__put_user_nocheck_4, SYM_L_GLOBAL) |
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ASM_STAC |
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3: movl %eax,(%_ASM_CX) |
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xor %ecx,%ecx |
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ASM_CLAC |
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ret |
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SYM_FUNC_END(__put_user_4) |
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EXPORT_SYMBOL(__put_user_4) |
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EXPORT_SYMBOL(__put_user_nocheck_4) |
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SYM_FUNC_START(__put_user_8) |
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LOAD_TASK_SIZE_MINUS_N(7) |
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cmp %_ASM_BX,%_ASM_CX |
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jae .Lbad_put_user |
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SYM_INNER_LABEL(__put_user_nocheck_8, SYM_L_GLOBAL) |
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ASM_STAC |
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4: mov %_ASM_AX,(%_ASM_CX) |
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#ifdef CONFIG_X86_32 |
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5: movl %edx,4(%_ASM_CX) |
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#endif |
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xor %ecx,%ecx |
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ASM_CLAC |
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RET |
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SYM_FUNC_END(__put_user_8) |
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EXPORT_SYMBOL(__put_user_8) |
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EXPORT_SYMBOL(__put_user_nocheck_8) |
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SYM_CODE_START_LOCAL(.Lbad_put_user_clac) |
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ASM_CLAC |
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.Lbad_put_user: |
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movl $-EFAULT,%ecx |
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RET |
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SYM_CODE_END(.Lbad_put_user_clac) |
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_ASM_EXTABLE_UA(1b, .Lbad_put_user_clac) |
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_ASM_EXTABLE_UA(2b, .Lbad_put_user_clac) |
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_ASM_EXTABLE_UA(3b, .Lbad_put_user_clac) |
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_ASM_EXTABLE_UA(4b, .Lbad_put_user_clac) |
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#ifdef CONFIG_X86_32 |
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_ASM_EXTABLE_UA(5b, .Lbad_put_user_clac) |
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#endif
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