kernel/linux.git/arch/mips/include/uapi/asm/swab.h, branch linux-4.4.y

MIPS: UAPI: Ignore __arch_swab{16,32,64} when using MIPS16

2015-10-05T09:30:23+00:00

Some GCC versions (e.g. 4.8.3) can incorrectly inline a function with MIPS32 instructions into another function with MIPS16 code [1], causing the assembler to genereate incorrect binary code or fail right away complaining about unrecognized opcode. In the case of __arch_swab{16,32}, when inlined by the compiler with flags `-mips32r2 -mips16 -Os', the assembler can fail with the following error. {standard input}:79: Error: unrecognized opcode `wsbh $2,$2' For performance concerns and to workaround the issue already existing in older compilers, just ignore these 2 functions when compiling with mips16 enabled. [1] Inlining nomips16 function into mips16 function can result in undefined builtins, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55777 Signed-off-by: Yousong Zhou Cc: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11241/ Signed-off-by: Ralf Baechle

Revert "MIPS: UAPI: Fix unrecognized opcode WSBH/DSBH/DSHD when using MIPS16."

2015-10-05T09:29:57+00:00

This reverts commit e0d8b2ec532852d4b5aabcec3e7611848c32237d. For at least GCC 4.8.3, adding nomips16 function attribute still cannot prevent it from being inlined in mips16 context. So revert it first in preparation for a better workaround. [1] Inlining nomips16 function into mips16 function can result in undefined builtins, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55777 Signed-off-by: Yousong Zhou Cc: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11240/ Signed-off-by: Ralf Baechle

MIPS: UAPI: Fix unrecognized opcode WSBH/DSBH/DSHD when using MIPS16.

2015-09-03T10:11:56+00:00

The nomips16 has to be added both as function attribute and assembler directive. When only function attribute is specified, the compiler will inline the function with -Os optimization. The generated assembly code cannot be correctly assembled because ISA mode switch has to be done through jump instruction. When only ".set nomips16" directive is used, the generated assembly code will use MIPS32 code for the inline assembly template and MIPS16 for the function return. The compiled binary is invalid: 00403100 <__arch_swab16>: 403100: 7c0410a0 wsbh v0,a0 403104: e820ea31 swc2 $0,-5583(at) while correct code should be: 00402650 <__arch_swab16>: 402650: 7c0410a0 wsbh v0,a0 402654: 03e00008 jr ra 402658: 3042ffff andi v0,v0,0xffff Signed-off-by: Yousong Zhou Cc: Chen Jie Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/11087/ Signed-off-by: Ralf Baechle

MIPS: Use WSBH/DSBH/DSHD on Loongson 3A

2014-09-22T11:35:46+00:00

Signed-off-by: chenj Cc: linux-mips@linux-mips.org Cc: chenhc@lemote.com Patchwork: https://patchwork.linux-mips.org/patch/7542/ Patchwork: https://patchwork.linux-mips.org/patch/7550/ Signed-off-by: Ralf Baechle

MIPS: : Don't reference CONFIG_* symbols.

2013-06-18T14:28:16+00:00

Signed-off-by: Ralf Baechle

UAPI: (Scripted) Disintegrate arch/mips/include/asm

2012-10-09T08:47:14+00:00

Signed-off-by: David Howells Acked-by: Arnd Bergmann Acked-by: Thomas Gleixner Acked-by: Michael Kerrisk Acked-by: Paul E. McKenney Acked-by: Dave Jones