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linux/arch/mips/lib/strnlen_user.S

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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 06:20:36 +08:00
/*
* 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.
*
* Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle
* Copyright (c) 1999 Silicon Graphics, Inc.
*/
#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 04:32:31 +08:00
#include <asm/asm-offsets.h>
MIPS: Export string functions alongside their definitions Now that EXPORT_SYMBOL can be used from assembly source, move the EXPORT_SYMBOL invocations for the strlen*, strnlen* & strncpy* functions to be alongside their definitions. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14513/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-11-07 19:14:14 +08:00
#include <asm/export.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 06:20:36 +08:00
#include <asm/regdef.h>
#define EX(insn,reg,addr,handler) \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
/*
Fix common misspellings Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 09:57:33 +08:00
* Return the size of a string including the ending NUL character up to a
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 06:20:36 +08:00
* maximum of a1 or 0 in case of error.
*
* Note: for performance reasons we deliberately accept that a user may
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 19:59:30 +08:00
* make strlen_user and strnlen_user access the first few KSEG0
* bytes. There's nothing secret there. On 64-bit accessing beyond
* the maximum is a tad hairier ...
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 06:20:36 +08:00
*/
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
.macro __BUILD_STRNLEN_ASM func
LEAF(__strnlen_\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 06:20:36 +08:00
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a0
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
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 06:20:36 +08:00
move v0, a0
PTR_ADDU a1, a0 # stop pointer
MIPS: strnlen_user.S: Fix a CPU_DADDI_WORKAROUNDS regression Correct a regression introduced with 8453eebd [MIPS: Fix strnlen_user() return value in case of overlong strings.] causing assembler warnings and broken code generated in __strnlen_kernel_nocheck_asm: arch/mips/lib/strnlen_user.S: Assembler messages: arch/mips/lib/strnlen_user.S:64: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set, resulting in the function looping indefinitely upon mounting NFS root. Use conditional assembly to avoid a microMIPS code size regression. Using $at unconditionally would cause such a regression as there are no 16-bit instruction encodings available for ALU operations using this register. Using $v1 unconditionally would produce short microMIPS encodings, but would prevent this register from being used across calls to this function. The extra LI operation introduced is free, replacing a NOP originally scheduled into the delay slot of the branch that follows. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10205/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-05-29 00:46:49 +08:00
1:
#ifdef CONFIG_CPU_DADDI_WORKAROUNDS
.set noat
li AT, 1
#endif
beq v0, a1, 1f # limit reached?
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
.ifeqs "\func", "kernel"
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
EX(lb, t0, (v0), .Lfault\@)
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
.else
EX(lbe, t0, (v0), .Lfault\@)
.endif
MIPS: Fix strnlen_user() return value in case of overlong strings. We were returning maxlen like the userland strnlen if no '\0' character was encountered while the kernel version is expected to return a value larger than maxlen. Fixed to return maxlen + 1. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-11-04 18:54:29 +08:00
.set noreorder
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 06:20:36 +08:00
bnez t0, 1b
MIPS: strnlen_user.S: Fix a CPU_DADDI_WORKAROUNDS regression Correct a regression introduced with 8453eebd [MIPS: Fix strnlen_user() return value in case of overlong strings.] causing assembler warnings and broken code generated in __strnlen_kernel_nocheck_asm: arch/mips/lib/strnlen_user.S: Assembler messages: arch/mips/lib/strnlen_user.S:64: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set, resulting in the function looping indefinitely upon mounting NFS root. Use conditional assembly to avoid a microMIPS code size regression. Using $at unconditionally would cause such a regression as there are no 16-bit instruction encodings available for ALU operations using this register. Using $v1 unconditionally would produce short microMIPS encodings, but would prevent this register from being used across calls to this function. The extra LI operation introduced is free, replacing a NOP originally scheduled into the delay slot of the branch that follows. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10205/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-05-29 00:46:49 +08:00
1:
#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
PTR_ADDIU v0, 1
#else
PTR_ADDU v0, AT
.set at
#endif
MIPS: Fix strnlen_user() return value in case of overlong strings. We were returning maxlen like the userland strnlen if no '\0' character was encountered while the kernel version is expected to return a value larger than maxlen. Fixed to return maxlen + 1. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-11-04 18:54:29 +08:00
.set reorder
PTR_SUBU v0, a0
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 06:20:36 +08:00
jr ra
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
END(__strnlen_\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 06:20:36 +08:00
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
.Lfault\@:
[MIPS] Eleminate local symbols from the symbol table. These symbols appear in oprofile output, stacktraces and similar but only make the output harder to read. Many identical symbol names such as "both_aligned" were also being used in multiple source files making it impossible to see which file actually was meant. So let's get rid of them. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-01-29 18:14:59 +08:00
move v0, zero
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 06:20:36 +08:00
jr ra
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
.endm
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
#ifndef CONFIG_EVA
/* Set aliases */
.global __strnlen_user_asm
.set __strnlen_user_asm, __strnlen_kernel_asm
MIPS: Fix modversions kernelci.org reports tons of build warnings for linux-next: 35 WARNING: "memcpy" [fs/fat/msdos.ko] has no CRC! 35 WARNING: "__copy_user" [fs/fat/fat.ko] has no CRC! 32 WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "__strncpy_from_user_nocheck_asm" [vmlinux] version generation failed, symbol will not be versioned. The problem here is mainly the missing asm/asm-prototypes.h header file that is supposed to include the prototypes for each symbol that is exported from an assembler file. A second problem is that the asm/uaccess.h header contains some but not all the necessary declarations for the user access helpers. Finally, the vdso build is broken once we add asm/asm-prototypes.h, so we have to fix this at the same time by changing the vdso header. My approach here is to just not look for exported symbols in the VDSO assembler files, as the symbols cannot be exported anyway. Fixes: 576a2f0c5c6d ("MIPS: Export memcpy & memset functions alongside their definitions") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: James Hogan <james.hogan@imgtec.com> Cc: Maciej W. Rozycki <macro@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15038/ Patchwork: https://patchwork.linux-mips.org/patch/15069/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-01-17 23:18:35 +08:00
EXPORT_SYMBOL(__strnlen_user_asm)
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
#endif
__BUILD_STRNLEN_ASM kernel
MIPS: Fix modversions kernelci.org reports tons of build warnings for linux-next: 35 WARNING: "memcpy" [fs/fat/msdos.ko] has no CRC! 35 WARNING: "__copy_user" [fs/fat/fat.ko] has no CRC! 32 WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "__strncpy_from_user_nocheck_asm" [vmlinux] version generation failed, symbol will not be versioned. The problem here is mainly the missing asm/asm-prototypes.h header file that is supposed to include the prototypes for each symbol that is exported from an assembler file. A second problem is that the asm/uaccess.h header contains some but not all the necessary declarations for the user access helpers. Finally, the vdso build is broken once we add asm/asm-prototypes.h, so we have to fix this at the same time by changing the vdso header. My approach here is to just not look for exported symbols in the VDSO assembler files, as the symbols cannot be exported anyway. Fixes: 576a2f0c5c6d ("MIPS: Export memcpy & memset functions alongside their definitions") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: James Hogan <james.hogan@imgtec.com> Cc: Maciej W. Rozycki <macro@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15038/ Patchwork: https://patchwork.linux-mips.org/patch/15069/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-01-17 23:18:35 +08:00
EXPORT_SYMBOL(__strnlen_kernel_asm)
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
#ifdef CONFIG_EVA
.set push
.set eva
MIPS: lib: strnlen_user: Use macro to build the strnlen_user symbol Build the __strnlen_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>
2014-01-03 00:19:49 +08:00
__BUILD_STRNLEN_ASM user
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
.set pop
MIPS: Fix modversions kernelci.org reports tons of build warnings for linux-next: 35 WARNING: "memcpy" [fs/fat/msdos.ko] has no CRC! 35 WARNING: "__copy_user" [fs/fat/fat.ko] has no CRC! 32 WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned. 32 WARNING: EXPORT symbol "__strncpy_from_user_nocheck_asm" [vmlinux] version generation failed, symbol will not be versioned. The problem here is mainly the missing asm/asm-prototypes.h header file that is supposed to include the prototypes for each symbol that is exported from an assembler file. A second problem is that the asm/uaccess.h header contains some but not all the necessary declarations for the user access helpers. Finally, the vdso build is broken once we add asm/asm-prototypes.h, so we have to fix this at the same time by changing the vdso header. My approach here is to just not look for exported symbols in the VDSO assembler files, as the symbols cannot be exported anyway. Fixes: 576a2f0c5c6d ("MIPS: Export memcpy & memset functions alongside their definitions") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: James Hogan <james.hogan@imgtec.com> Cc: Maciej W. Rozycki <macro@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15038/ Patchwork: https://patchwork.linux-mips.org/patch/15069/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-01-17 23:18:35 +08:00
EXPORT_SYMBOL(__strnlen_user_asm)
MIPS: lib: strnlen_user: Add EVA support In non-EVA mode, a strlen_user* alias is used for the strlen_kernel* symbols since the code is identical. In EVA mode, a new strlen_user* symbol is used which uses the EVA specific instructions to load values from userspace. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
2013-12-09 23:28:10 +08:00
#endif