Re: Toybox make root no longer works as expected

Hi Florian,

On Tue, 2026-07-14 at 09:47 +0200, Florian Fuchs wrote:
> > OK, for some reason it works now. Unfortunately, the toolchain doesn't =
like the current kernel:
> >=20
> >   CC      net/ipv4/inetpeer.o
> > during RTL pass: final
> > In file included from kernel/nstree.c:8:
> > kernel/nstree.c: In function '__se_sys_listns':
> > ./include/linux/syscalls.h:261:9: internal compiler error: in change_ad=
dress_1, at emit-rtl.c:2275
> >   261 |         }                                                      =
         \
> >       |         ^
> > ./include/linux/syscalls.h:236:9: note: in expansion of macro '__SYSCAL=
L_DEFINEx'
> >   236 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >       |         ^~~~~~~~~~~~~~~~~
> > ./include/linux/syscalls.h:228:36: note: in expansion of macro 'SYSCALL=
_DEFINEx'
> >   228 | #define SYSCALL_DEFINE4(name, ...) SYSCALL_DEFINEx(4, _##name, =
__VA_ARGS__)
> >       |                                    ^~~~~~~~~~~~~~~
> > kernel/nstree.c:763:1: note: in expansion of macro 'SYSCALL_DEFINE4'
> >   763 | SYSCALL_DEFINE4(listns, const struct ns_id_req __user *, req,
> >       | ^~~~~~~~~~~~~~~
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > See <https://gcc.gnu.org/bugs/> for instructions.
> > {standard input}: Assembler messages:
> > {standard input}: Warning: end of file not at end of a line; newline in=
serted
> > {standard input}:1592: Error: missing operand
> > {standard input}:1592: Error: invalid operands for opcode
> > {standard input}:976: Error: displacement to undefined symbol .L339 ove=
rflows 12-bit field
> > {standard input}:1014: Error: displacement to undefined symbol .L459 ov=
erflows 12-bit field
> > {standard input}:1028: Error: displacement to undefined symbol .L340 ov=
erflows 12-bit field
> > {standard input}:1040: Error: displacement to undefined symbol .L461 ov=
erflows 12-bit field
> > {standard input}:1060: Error: displacement to undefined symbol .L462 ov=
erflows 12-bit field
> > {standard input}:1082: Error: displacement to undefined symbol .L463 ov=
erflows 12-bit field
> > {standard input}:1100: Error: displacement to undefined symbol .L252 ov=
erflows 12-bit field
> > {standard input}:1201: Error: displacement to undefined symbol .L286 ov=
erflows 12-bit field
> > {standard input}:1211: Error: displacement to undefined symbol .L468 ov=
erflows 12-bit field
> > {standard input}:1221: Error: displacement to undefined symbol .L298 ov=
erflows 12-bit field
> > {standard input}:1234: Error: displacement to undefined symbol .L469 ov=
erflows 12-bit field
> > {standard input}:1256: Error: displacement to undefined symbol .L349 ov=
erflows 12-bit field
> > {standard input}:1341: Error: displacement to undefined symbol .L314 ov=
erflows 12-bit field
> > {standard input}:1488: Error: displacement to undefined symbol .L454 ov=
erflows 8-bit field=20
> > {standard input}:1498: Error: displacement to undefined symbol .L471 ov=
erflows 8-bit field=20
> > make[3]: *** [scripts/Makefile.build:289: kernel/nstree.o] Error 1
> > make[3]: *** Waiting for unfinished jobs....
> >=20
> > Adrian
>=20
> I also crafted a bit with gcc-17, and my first issue was a duplicate
> symbols (LPCS0) compiling libgcc like in
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D89012 I could only work
> around with explicitly using O1 instead of O2 in INTERNAL_CFLAGS of gcc.
>=20
> And errors with libbacktrace, I worked around by --enable-languages=3Dc
>=20
> I got gcc to not ICE, but it then fails with invalid assembler thats why
> I became suspicious about the asm in question. turns out, delcaring the
> adresses as offsetable, seems to "fix" the ICE and compile and work for
> fdpic, means it is maybe not necessarily only a GCC issue.
>=20
> diff --git a/arch/sh/include/asm/uaccess_32.h b/arch/sh/include/asm/uacce=
ss_32.h
> index 5d7ddc092afd..cef40414bfb1 100644
> --- a/arch/sh/include/asm/uaccess_32.h
> +++ b/arch/sh/include/asm/uaccess_32.h
> @@ -92,7 +92,7 @@ __asm__ __volatile__( \
>  	".long	1b + 2, 3b\n\t" \
>  	".previous" \
>  	:"=3D&r" (err), "=3D&r" (x) \
> -	:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
> +	:"o" (__m(addr)), "i" (-EFAULT), "0" (err)); })
>  #else
>  #define __get_user_u64(x, addr, err) \
>  ({ \
> @@ -116,7 +116,7 @@ __asm__ __volatile__( \
>  	".long	1b + 2, 3b\n\t" \
>  	".previous" \
>  	:"=3D&r" (err), "=3D&r" (x) \
> -	:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
> +	:"o" (__m(addr)), "i" (-EFAULT), "0" (err)); })
>  #endif
> =20
>  #define __put_user_size(x,ptr,size,retval)		\
> @@ -196,7 +196,7 @@ __asm__ __volatile__( \
>  	".long	1b, 3b\n\t" \
>  	".previous" \
>  	: "=3Dr" (retval) \
> -	: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
> +	: "r" (val), "o" (__m(addr)), "i" (-EFAULT), "0" (retval) \
>          : "memory"); })
>  #else
>  #define __put_user_u64(val,addr,retval) \
> @@ -218,7 +218,7 @@ __asm__ __volatile__( \
>  	".long	1b, 3b\n\t" \
>  	".previous" \
>  	: "=3Dr" (retval) \
> -	: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
> +	: "r" (val), "o" (__m(addr)), "i" (-EFAULT), "0" (retval) \
>          : "memory"); })
>  #endif
> =20

Thanks a lot for looking into this, I appreciate the help!

Did you manage to build a J2 toolchain using GCC 17? I have not looked
into it myself yet due to time constraints, but I would like to switch
to a newer compiler to build test kernels for my J2.

Adrian

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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