generic: fix unrecognized opcode wsbh when building for MIPS16.

The issue was found and reported by hynman [1] when compiling reaver for ar71xx
(Big Endian MIPS).

    {standard input}: Assembler messages:
    {standard input}:79: Error: unrecognized opcode `wsbh $2,$2'
    {standard input}:90: Error: unrecognized opcode `wsbh $3,$17'
    {standard input}:208: Error: unrecognized opcode `wsbh $2,$2'
    make[3]: *** [builder.o] Error 1

The patch was already in upstream since kernel release 4.3-rc5.

 [1] 1e29676a8a (commitcomment-12901931)

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

SVN-Revision: 47322
master
Felix Fietkau 9 years ago
parent 180713b89b
commit 93efeef9b3
  1. 58
      target/linux/generic/patches-3.18/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch
  2. 58
      target/linux/generic/patches-4.0/133-MIPS-UAPI-Ignore-__arch_swab-16-32-64-when-using-MIP.patch
  3. 58
      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

@ -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

@ -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
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