kernel/arch/mips/include/asm/asm.h, branch linux-5.1.y

MIPS: Remove unused PREF, PREFE & PREFX macros

2018-10-16T06:11:14Z

asm/asm.h provides PREF(), PREFE() & PREFX() macros which are now entirely unused. Delete the dead code. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20908/ Cc: linux-mips@linux-mips.org

MIPS: Remove unused CAT macro

2018-10-16T06:11:13Z

asm/asm.h provides a CAT macro which is unused throughout the tree, and if anyone wanted it the generic CONCATENATE macro in linux/kernel.h provides the same functionality. Delete the dead code. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20905/ Cc: linux-mips@linux-mips.org

MIPS: Remove unused TTABLE macro

2018-10-16T06:11:13Z

asm/asm.h contains a TTABLE macro to generate "text tables" which would appear to be arrays of pointers to strings. It is unused throughout the kernel tree, so delete the dead code. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20904/ Cc: linux-mips@linux-mips.org

MIPS: Remove unused PIC macros

2018-10-16T06:11:12Z

asm/asm.h contains CPRESTORE, CPADD & CPLOAD macros that are intended for use with position independent code, but are not used anywhere in the kernel - along with a comment to that effect. Remove the dead code. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20903/ Cc: linux-mips@linux-mips.org

MIPS: Remove unused MOVN & MOVZ macros

2018-10-16T06:11:12Z

We have macros in asm/asm.h to allow for use of the MOVN & MOVZ instructions with compare-and-branch sequences providing compatibility for ISA versions which don't include those instructions. However the macros are unused, and appear to have always been unused. Delete the dead code. Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20909/ Cc: linux-mips@linux-mips.org

MIPS: Add DWARF unwinding to assembly

2017-09-06T09:01:52Z

This will allow kdump dumps to work correclty with MIPS and future DWARF unwinding of the stack to give accurate tracebacks. Signed-off-by: Corey Minyard Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16990/ Signed-off-by: Ralf Baechle

MIPS: End asm function prologue macros with .insn

2017-01-03T15:34:49Z

When building a kernel targeting a microMIPS ISA, recent GNU linkers will fail the link if they cannot determine that the target of a branch or jump is microMIPS code, with errors such as the following: mips-img-linux-gnu-ld: arch/mips/built-in.o: .text+0x542c: Unsupported jump between ISA modes; consider recompiling with interlinking enabled. mips-img-linux-gnu-ld: final link failed: Bad value or: ./arch/mips/include/asm/uaccess.h:1017: warning: JALX to a non-word-aligned address Placing anything other than an instruction at the start of a function written in assembly appears to trigger such errors. In order to prepare for allowing us to follow function prologue macros with an EXPORT_SYMBOL invocation, end the prologue macros (LEAD, NESTED & FEXPORT) with a .insn directive. This ensures that the start of the function is marked as code, which always makes sense for functions & safely prevents us from hitting the link errors described above. Signed-off-by: Paul Burton Reviewed-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14508/ Signed-off-by: Ralf Baechle

MIPS: Fix gigaton of warning building with microMIPS.

2014-03-31T16:17:12Z

With binutils 2.24 the attempt to switch with microMIPS mode to MIPS III mode through .set mips3 results in *lots* of warnings like {standard input}: Assembler messages: {standard input}:397: Warning: the 64-bit MIPS architecture does not support the `smartmips' extension during a kernel build. Fixed by using .set arch=r4000 instead. This breaks support for building the kernel with binutils 2.13 which was supported for 32 bit kernels only anyway and 2.14 which was a bad vintage for MIPS anyway. Signed-off-by: Ralf Baechle

MIPS: asm: Add wrappers for EVA/non-EVA instructions

2014-03-26T22:09:12Z

EVA uses specific instructions for accessing user memory. Instead of polluting the kernel with numerous #ifdef CONFIG_EVA we add wrappers for all the instructions that need special handling when EVA is enabled. Signed-off-by: Markos Chandras

MIPS: asm: Add prefetch instruction for EVA

2014-03-26T22:09:12Z

EVA can use the PREFE instruction to perform the virtual address translation using the user mapping of the address rather than the kernel mapping. Signed-off-by: Leonid Yegoshin Signed-off-by: Markos Chandras