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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch/mips/lib/strncpy_user.S

85 строки
1.8 KiB
ArmAsm
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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
MIPS: microMIPS: Optimise 'strncpy' core library function. Optimise 'strncpy' to use microMIPS instructions and/or optimisations for binary size reduction. When the microMIPS ISA is not being used, the library function compiles to the original binary code. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
2013-03-25 22:41:18 +04:00
* Copyright (C) 1996, 1999 by Ralf Baechle
* Copyright (C) 2011 MIPS Technologies, Inc.
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
*/
#include <linux/errno.h>
#include <asm/asm.h>
kbuild: mips use generic asm-offsets.h support Removed obsolete stuff from arch makefile. mips had a special rule for generating asm-offsets.h so preserved it using an architecture specific hook in top-level Kbuild file. Renamed .h file to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2005-09-10 00:32:31 +04:00
#include <asm/asm-offsets.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
#include <asm/regdef.h>
#define EX(insn,reg,addr,handler) \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
/*
* Returns: -EFAULT if exception before terminator, N if the entire
* buffer filled, else strlen.
*/
/*
* Ugly special case have to check: we might get passed a user space
MIPS: Whitespace cleanup. Having received another series of whitespace patches I decided to do this once and for all rather than dealing with this kind of patches trickling in forever. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-01-22 15:59:30 +04:00
* pointer which wraps into the kernel space. We don't deal with that. If
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
* it happens at most some bytes of the exceptions handlers will be copied.
*/
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
.macro __BUILD_STRNCPY_ASM func
LEAF(__strncpy_from_\func\()_asm)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a1
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
bnez v0, .Lfault\@
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
FEXPORT(__strncpy_from_\func\()_nocheck_asm)
MIPS: microMIPS: Optimise 'strncpy' core library function. Optimise 'strncpy' to use microMIPS instructions and/or optimisations for binary size reduction. When the microMIPS ISA is not being used, the library function compiles to the original binary code. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
2013-03-25 22:41:18 +04:00
move t0, zero
move v1, a1
MIPS: lib: strncpy_user: Add EVA support In non-EVA mode, strncpy_from_user* aliases are used for the strncpy_from_kernel* symbols since the code is identical. In EVA mode, new strcpy_from_user* symbols are used which use the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:40:20 +04:00
.ifeqs "\func","kernel"
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
1: EX(lbu, v0, (v1), .Lfault\@)
MIPS: lib: strncpy_user: Add EVA support In non-EVA mode, strncpy_from_user* aliases are used for the strncpy_from_kernel* symbols since the code is identical. In EVA mode, new strcpy_from_user* symbols are used which use the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:40:20 +04:00
.else
1: EX(lbue, v0, (v1), .Lfault\@)
.endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
PTR_ADDIU v1, 1
[MIPS] IP28: added cache barrier to assembly routines IP28 needs special treatment to avoid speculative accesses. gcc takes care for .c code, but for assembly code we need to do it manually. This is taken from Peter Fuersts IP28 patches. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-11-25 13:47:56 +03:00
R10KCBARRIER(0(ra))
MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix This corrects assembler warnings and broken code generated in __strncpy_from_user_asm: arch/mips/lib/strncpy_user.S: Assembler messages: arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set. The function schedules delay slots manually where there is really no need to as GAS is happy to do it all itself, so undo it all and remove `.set noreorder'. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-04-04 06:32:29 +04:00
sb v0, (a0)
MIPS: microMIPS: Optimise 'strncpy' core library function. Optimise 'strncpy' to use microMIPS instructions and/or optimisations for binary size reduction. When the microMIPS ISA is not being used, the library function compiles to the original binary code. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
2013-03-25 22:41:18 +04:00
beqz v0, 2f
PTR_ADDIU t0, 1
MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix This corrects assembler warnings and broken code generated in __strncpy_from_user_asm: arch/mips/lib/strncpy_user.S: Assembler messages: arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set. The function schedules delay slots manually where there is really no need to as GAS is happy to do it all itself, so undo it all and remove `.set noreorder'. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-04-04 06:32:29 +04:00
PTR_ADDIU a0, 1
MIPS: microMIPS: Optimise 'strncpy' core library function. Optimise 'strncpy' to use microMIPS instructions and/or optimisations for binary size reduction. When the microMIPS ISA is not being used, the library function compiles to the original binary code. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
2013-03-25 22:41:18 +04:00
bne t0, a2, 1b
2: PTR_ADDU v0, a1, t0
xor v0, a1
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
bltz v0, .Lfault\@
MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix This corrects assembler warnings and broken code generated in __strncpy_from_user_asm: arch/mips/lib/strncpy_user.S: Assembler messages: arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set. The function schedules delay slots manually where there is really no need to as GAS is happy to do it all itself, so undo it all and remove `.set noreorder'. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-04-04 06:32:29 +04:00
move v0, t0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
jr ra # return n
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
END(__strncpy_from_\func\()_asm)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix This corrects assembler warnings and broken code generated in __strncpy_from_user_asm: arch/mips/lib/strncpy_user.S: Assembler messages: arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set. The function schedules delay slots manually where there is really no need to as GAS is happy to do it all itself, so undo it all and remove `.set noreorder'. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-04-04 06:32:29 +04:00
.Lfault\@:
li v0, -EFAULT
jr ra
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
.section __ex_table,"a"
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
PTR 1b, .Lfault\@
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
.previous
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
.endm
MIPS: lib: strncpy_user: Add EVA support In non-EVA mode, strncpy_from_user* aliases are used for the strncpy_from_kernel* symbols since the code is identical. In EVA mode, new strcpy_from_user* symbols are used which use the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:40:20 +04:00
#ifndef CONFIG_EVA
/* Set aliases */
.global __strncpy_from_user_asm
.global __strncpy_from_user_nocheck_asm
.set __strncpy_from_user_asm, __strncpy_from_kernel_asm
.set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm
#endif
__BUILD_STRNCPY_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol Build the __strncpy_from_user symbol using a macro. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:36:49 +04:00
__BUILD_STRNCPY_ASM user
MIPS: lib: strncpy_user: Add EVA support In non-EVA mode, strncpy_from_user* aliases are used for the strncpy_from_kernel* symbols since the code is identical. In EVA mode, new strcpy_from_user* symbols are used which use the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2014-01-02 20:40:20 +04:00
.set pop
#endif