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Re: MIPS toolchain

To: Dmitri Vorobiev <dmitri.vorobiev@movial.fi>
Subject: Re: MIPS toolchain
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 16 Jul 2008 11:45:33 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <487DA40C.6010405@movial.fi>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <487DA40C.6010405@movial.fi>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.18 (2008-05-17)
On Wed, Jul 16, 2008 at 10:32:28AM +0300, Dmitri Vorobiev wrote:

> The linux-mips.org Web site recommends gcc 3.4.4 to build the MIPS kernel. 
> However:
> 
> <<<<<<<<<<<<<<<<<<
> 
> [dmitri.vorobiev@amber linux-2.6]$ mips-unknown-linux-gnu-gcc -v
> Reading specs from 
> /home/dmitri.vorobiev/Projects/misc/zoo/lib/gcc/mips-unknown-linux-gnu/3.4.4/specs
> Configured with: ../src/gcc-3.4.4/configure 
> --prefix=/home/dmitri.vorobiev/Projects/misc/zoo 
> --target=mips-unknown-linux-gnu --disable-nls --without-headers --with-gnu-ld 
> --with-gnu-as --disable-shared --disable-threads
> Thread model: single
> gcc version 3.4.4
> [dmitri.vorobiev@amber linux-2.6]$ make ARCH=mips 
> CROSS_COMPILE=mips-unknown-linux-gnu-
>   CHK     include/linux/version.h
>   CHK     include/linux/utsrelease.h
>   CALL    scripts/checksyscalls.sh
>   CC      init/main.o
> include/asm/bitops.h: In function `start_kernel':
> include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match 
> constraints
> include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match 
> constraints
> include/asm/bitops.h:76: warning: asm operand 2 probably doesn't match 
> constraints
> include/asm/bitops.h:76: error: impossible constraint in `asm'
> include/asm/bitops.h:76: error: impossible constraint in `asm'
> include/asm/bitops.h:76: error: impossible constraint in `asm'
> make[1]: *** [init/main.o] Error 1
> make: *** [init] Error 2
> [dmitri.vorobiev@amber linux-2.6]$
> 
> <<<<<<<<<<<<<<<<<<
> 
> Kernel build goes smoothly for me with this gcc version:
> 
> <<<<<<<<<<<<<<<<<<
> 
> [dmitri.vorobiev@amber linux-2.6]$ mips-unknown-linux-gnu-gcc -v
> Using built-in specs.
> Target: mips-unknown-linux-gnu
> Configured with: ../gcc-4.3.0/configure --target=mips-unknown-linux-gnu 
> --disable-nls --disable-threads --disable-shared --disable-multilib 
> --disable-libmudflap --disable-libssp 
> --prefix=/home/dmitri.vorobiev/Projects/misc/zoo/4.3-toolchain 
> --with-gmp=/home/dmitri.vorobiev/Projects/misc/zoo/ 
> --with-mfpr=/home/dmitri.vorobiev/Projects/misc/zoo --without-headers 
> --with-gnu-as=/tmp/cross/ --with-gnu-ld=/tmp/cross/ --disable-libgcc 
> --enable-languages=c --disable-libgomp
> Thread model: single
> gcc version 4.3.0 (GCC)
> [dmitri.vorobiev@amber linux-2.6]$
> 
> <<<<<<<<<<<<<<<<<<
> 
> What I would like to know is which gcc/binutils versions are currently the 
> blessed ones. Thanks.

Anything from gcc 3.2 to 4.3 is supposed to work for 32-bit kernels; 3.3
to 4.3 are the blessed ones for 64-bit kernels.

I'll look into that build problem ...   hmm...  First thing I'm hitting
with 3.4.6 and binutils 2.18 is:

[ralf@denk linux-mips]$ make malta_defconfig
[ralf@denk linux-mips]$ nice -19 make
cc1: error: unrecognized command line option "-fno-stack-protector"
scripts/kconfig/conf -s arch/mips/Kconfig
cc1: error: unrecognized command line option "-fno-stack-protector"

With the offending line in the main Makefile commented out I get the same
error messages as you.  Initial fix below.

  Ralf

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/include/asm-mips/bitops.h b/include/asm-mips/bitops.h
index 9a7274b..49df8c4 100644
--- a/include/asm-mips/bitops.h
+++ b/include/asm-mips/bitops.h
@@ -82,7 +82,7 @@ static inline void set_bit(unsigned long nr, volatile 
unsigned long *addr)
                "2:     b       1b                                      \n"
                "       .previous                                       \n"
                : "=&r" (temp), "=m" (*m)
-               : "i" (bit), "m" (*m), "r" (~0));
+               : "ir" (bit), "m" (*m), "r" (~0));
 #endif /* CONFIG_CPU_MIPSR2 */
        } else if (cpu_has_llsc) {
                __asm__ __volatile__(
@@ -147,7 +147,7 @@ static inline void clear_bit(unsigned long nr, volatile 
unsigned long *addr)
                "2:     b       1b                                      \n"
                "       .previous                                       \n"
                : "=&r" (temp), "=m" (*m)
-               : "i" (bit), "m" (*m));
+               : "ir" (bit), "m" (*m));
 #endif /* CONFIG_CPU_MIPSR2 */
        } else if (cpu_has_llsc) {
                __asm__ __volatile__(
@@ -428,7 +428,7 @@ static inline int test_and_clear_bit(unsigned long nr,
                "2:     b       1b                                      \n"
                "       .previous                                       \n"
                : "=&r" (temp), "=m" (*m), "=&r" (res)
-               : "i" (bit), "m" (*m)
+               : "ir" (bit), "m" (*m)
                : "memory");
 #endif
        } else if (cpu_has_llsc) {

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