diff options
Diffstat (limited to 'target/linux/generic/patches-4.1')
| -rw-r--r-- | target/linux/generic/patches-4.1/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.1/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch b/target/linux/generic/patches-4.1/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch new file mode 100644 index 0000000..d8f25ac --- /dev/null +++ b/target/linux/generic/patches-4.1/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch @@ -0,0 +1,58 @@ +From 71a0a72456b48de972d7ed613b06a22a3aa9057f Mon Sep 17 00:00:00 2001 +From: Yousong Zhou <yszhou4tech@gmail.com> +Date: Sat, 26 Sep 2015 13:41:43 +0800 +Subject: [PATCH] MIPS: UAPI: Ignore __arch_swab{16,32,64} when using MIPS16 + +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 <yszhou4tech@gmail.com> +Cc: Maciej W. Rozycki <macro@linux-mips.org> +Cc: linux-mips@linux-mips.org +Patchwork: https://patchwork.linux-mips.org/patch/11241/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/include/uapi/asm/swab.h | 7 ++++--- + 1 file changed, 4 insertions(+), 3 deletions(-) + +diff --git a/arch/mips/include/uapi/asm/swab.h b/arch/mips/include/uapi/asm/swab.h +index 8f2d184..23cd9b1 100644 +--- a/arch/mips/include/uapi/asm/swab.h ++++ b/arch/mips/include/uapi/asm/swab.h +@@ -13,8 +13,9 @@ + + #define __SWAB_64_THRU_32__ + +-#if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) || \ +- defined(_MIPS_ARCH_LOONGSON3A) ++#if !defined(__mips16) && \ ++ ((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) || \ ++ defined(_MIPS_ARCH_LOONGSON3A)) + + static inline __attribute_const__ __u16 __arch_swab16(__u16 x) + { +@@ -65,5 +66,5 @@ static inline __attribute_const__ __u64 __arch_swab64(__u64 x) + } + #define __arch_swab64 __arch_swab64 + #endif /* __mips64 */ +-#endif /* MIPS R2 or newer or Loongson 3A */ ++#endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */ + #endif /* _ASM_SWAB_H */ +-- +1.7.10.4 + |