kernel/arch/mips/include/asm/mipsregs.h, branch linux-rolling-stable

mips: Replace ASSEMBLY with ASSEMBLER in the mips headers

2025-08-29T20:34:29Z

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. Defining such a macro was necessary in the early days of the kernel, since GCC only started providing __ASSEMBLER__ since version 3.0 in 2000 (see https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=f8f769ea4e69 ). However, having two macros can be very confusing nowadays for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that should use __ASSEMBLER__ instead. So let's now standardize on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), with just one comment tweaked manually in arch/mips/include/asm/cpu.h (that was missing some underscores). Cc: Thomas Bogendoerfer Cc: linux-mips@vger.kernel.org Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Maciej W. Rozycki Signed-off-by: Thomas Huth Signed-off-by: Thomas Bogendoerfer

MIPS: kernel: Rename read/write_c0_ecc to read/writec0_errctl

2025-01-11T11:31:21Z

CP0 register 26 is used as ECC register for legacy cores, but newer cores (MIPS32/MIPS64) use it as an ErrCtl register. Since the kernel only uses CP0 26 as ErrCtl register rename the access functions to the more fitting name. Signed-off-by: Thomas Bogendoerfer Reviewed-by: Maciej W. Rozycki Signed-off-by: Thomas Bogendoerfer

MIPS: mipsregs: Parse fp and sp register by name in parse_r

2024-02-28T11:25:52Z

parse_r helper is used to parse register number from oprand, it only handles oprand which use number to refer register before. However compiler may use $gp and $sp to reference register 29 and 30. Handle this situation by adding relevant match name. Fixes compilation error: {standard input}: Assembler messages: {standard input}:1937: Error: Unable to parse register name $fp Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: mipsregs: Set proper ISA level for virt extensions

2024-02-23T09:13:48Z

c994a3ec7ecc ("MIPS: set mips32r5 for virt extensions") setted some instructions in virt extensions to ISA level mips32r5. However TLB related vz instructions was leftover, also this shouldn't be done to a R5 or R6 kernel buid. Reorg macros to set ISA level as needed when _ASM_SET_VIRT is called. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Implement microMIPS MT ASE helpers

2024-02-23T09:13:47Z

Implement various microMIPS MT ASE helpers accroading to: MIPS® Architecture for Programmers Volume IV-f: The MIPS® MT Module for the microMIPS32™ Architecture Fixes build error: {standard input}:2616: Error: branch to a symbol in another ISA mode This make MT ASE available on microMIPS as well. Boot tested on M5150 with microMIPS enabled on M5150. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Unify define of CP0 registers for uasm code

2024-02-20T11:41:51Z

Definitions of uasm variant of CP0 registers are unified to mipsregs.h, so they lay together with uasm variant of the code. Signed-off-by: Jiaxun Yang Signed-off-by: Thomas Bogendoerfer

MIPS: Fix typos

2024-01-08T09:39:12Z

Fix typos, most reported by "codespell arch/mips". Only touches comments, no code changes. Signed-off-by: Bjorn Helgaas Cc: linux-mips@vger.kernel.org Reviewed-by: Randy Dunlap Signed-off-by: Thomas Bogendoerfer

MIPS: Always use -Wa,-msoft-float and eliminate GAS_HAS_SET_HARDFLOAT

2023-01-26T03:41:16Z

-Wa,-msoft-float is tested with as-option, which will be a problem for clang with an upcoming change to move as-option to use KBUILD_AFLAGS instead of KBUILD_CFLAGS due to a lack of '-mno-abicalls' in KBUILD_AFLAGS at the point that this check occurs; $(cflags-y) is added to KBUILD_AFLAGS towards the end of this file. clang: error: ignoring '-fno-PIE' option as it cannot be used with implicit usage of -mabicalls and the N64 ABI [-Werror,-Woption-ignored] This could be resolved by switching to a cc-option check but '$(cflags-y)' would need to be added so that '-mno-abicalls' is present for the test. However, this check is no longer necessary, as -msoft-float is supported by all supported assembler versions (GNU as 2.25+ and LLVM 11+). Eliminate GAS_HAS_SET_HARDFLOAT and all of its uses, inlining SET_HARDFLOAT where necessary. Link: https://lore.kernel.org/202209101939.bvk64Fok-lkp@intel.com/ Reported-by: kernel test robot Signed-off-by: Nathan Chancellor Acked-by: Thomas Bogendoerfer Reviewed-by: Nick Desaulniers Reviewed-by: Philippe Mathieu-Daudé Tested-by: Linux Kernel Functional Testing Tested-by: Anders Roxell Signed-off-by: Masahiro Yamada

MIPS: Remove VR41xx support

2022-07-14T09:52:29Z

No (active) developer owns this hardware, so let's remove Linux support. Signed-off-by: Thomas Bogendoerfer

MIPS: remove asm/war.h

2022-02-22T08:35:49Z

The major part for workaround handling has already moved to config options. This change replaces the remaining defines by already available config options and gets rid of war.h Signed-off-by: Thomas Bogendoerfer