Bug#1003490: u-boot: FTBFS on arch:all with qemu-ppce500 target

[Vagrant Cascadian]

On 2022-01-25, Vagrant Cascadian wrote:
> On 2022-01-15, Aurelien Jarno wrote:
>> On 2022-01-11 16:40, Vagrant Cascadian wrote:
>>> On 2022-01-11, Lennart Sorensen wrote:
>>> > On Mon, Jan 10, 2022 at 05:10:04PM -0800, Vagrant Cascadian wrote:
>>> >> Something in the toolchain recently changed which causes u-boot arch:all
>>> >> build to FTBFS... I suspect binutils, as building in "bookworm" still
>>> >> works fine where binutils hasn't yet migrated.
>>> >> 
>>> >> On arch:all builds the qemu-ppce500 target is cross-compiled.
>>> >> 
>>> >> Full log:
>>> >> 
>>> >>   https://buildd.debian.org/status/fetch.php?pkg=u-boot&arch=all&ver=2022.01%2Bdfsg-1&stamp=1641860624&raw=0
>>> >> 
>>> >> The hopefully relevent lines from the build log:
...
>>> >> {standard input}: Assembler messages:
>>> >> {standard input}:127: Error: unrecognized opcode: `tlbre'
>>> >> {standard input}:418: Error: unrecognized opcode: `tlbre'
>>> >> {standard input}:821: Error: unrecognized opcode: `msync'
>>> >> {standard input}:821: Error: unrecognized opcode: `tlbwe'
>>> >> {standard input}:884: Error: unrecognized opcode: `tlbsx'
>>> >> make[4]: *** [/<<PKGBUILDDIR>>/scripts/Makefile.build:253: arch/powerpc/cpu/mpc85xx/tlb.o] Error 1
>>> >> make[3]: *** [/<<PKGBUILDDIR>>/Makefile:1810: arch/powerpc/cpu/mpc85xx] Error 2
>>> >> make[3]: *** Waiting for unfinished jobs....
>>> >>   powerpc-linux-gnu-gcc -Wp,-MD,arch/powerpc/lib/.traps.o.d -nost
> ...
>>> The binutils versions appear to be:
>>> 
>>>   succeeding, bookworm 2.37-10.1
>>>   failing, sid 2.37.50.20220106-2
>>> 
>>
>> Yep, this is due to commit b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a on
>> the binutils side [1], which changes the behavior of `.machine`
>> directives to override, rather than augment, the base CPU. GCC is called
>> with -Wa,-me500 to enable PowerPC e500 instructions on the assembler
>> side, but as the default GCC machine is ppc, a `.set machine ppc` is
>> emitted at the beginning of the assembly code.
>>
>> One option would be to force the CPU to e500 on the GCC side, however
>> support for it has been removed. The options is therefore to force the
>> machine in the assembly code. This is what the attached patch does.
>
> Somehow I missed that you had attached a patch! I will try to get this
> tested and uploaded to Debian soon...

Your patch fixed building qemu-ppce500, but now I think we have a
potentially similar problem with qemu-riscv64 and qemu-riscv64_smode:

/<<PKGBUILDDIR>>/arch/riscv/cpu/cpu.c: Assembler messages:
/<<PKGBUILDDIR>>/arch/riscv/cpu/cpu.c:94: Error: unrecognized opcode
  `csrs sstatus,a5'
/<<PKGBUILDDIR>>/arch/riscv/cpu/cpu.c:95: Error: unrecognized opcode
  `csrw 0x003,0'
make[4]: *** [/<<PKGBUILDDIR>>/scripts/Makefile.build:254:
  arch/riscv/cpu/cpu.o] Error 1
make[3]: *** [/<<PKGBUILDDIR>>/Makefile:1810: arch/riscv/cpu] Error 2
make[3]: Leaving directory
  '/<<PKGBUILDDIR>>/debian/build/qemu-riscv64_smode'


live well,
  vagrant


>> --- u-boot-2022.01+dfsg.orig/arch/powerpc/cpu/mpc85xx/tlb.c
>> +++ u-boot-2022.01+dfsg/arch/powerpc/cpu/mpc85xx/tlb.c
>> @@ -50,7 +50,10 @@ void read_tlbcam_entry(int idx, u32 *val
>>  	u32 _mas1;
>>  
>>  	mtspr(MAS0, FSL_BOOKE_MAS0(1, idx, 0));
>> -	asm volatile("tlbre;isync");
>> +	asm volatile(".machine push;\n"
>> +		     ".machine e500;\n"
>> +		     "tlbre;isync;\n"
>> +		     ".machine pop;\n");
>>  	_mas1 = mfspr(MAS1);
>>  
>>  	*valid = (_mas1 & MAS1_VALID);
>> @@ -109,7 +112,10 @@ void init_used_tlb_cams(void)
>>  	/* walk all the entries */
>>  	for (i = 0; i < num_cam; i++) {
>>  		mtspr(MAS0, FSL_BOOKE_MAS0(1, i, 0));
>> -		asm volatile("tlbre;isync");
>> +		asm volatile(".machine push;\n"
>> +			     ".machine e500;\n"
>> +			     "tlbre;isync;\n"
>> +			     ".machine pop;");
>>  		if (mfspr(MAS1) & MAS1_VALID)
>>  			use_tlb_cam(i);
>>  	}
>> @@ -183,7 +189,10 @@ void disable_tlb(u8 esel)
>>  #ifdef CONFIG_ENABLE_36BIT_PHYS
>>  	mtspr(MAS7, 0);
>>  #endif
>> -	asm volatile("isync;msync;tlbwe;isync");
>> +	asm volatile(".machine push;\n"
>> +		     ".machine e500;\n"
>> +		     "isync;msync;tlbwe;isync;\n"
>> +		     ".machine pop;\n");
>>  
>>  #ifdef CONFIG_ADDR_MAP
>>  	if (gd->flags & GD_FLG_RELOC)
>> @@ -193,7 +202,11 @@ void disable_tlb(u8 esel)
>>  
>>  static void tlbsx (const volatile unsigned *addr)
>>  {
>> -	__asm__ __volatile__ ("tlbsx 0,%0" : : "r" (addr), "m" (*addr));
>> +	__asm__ __volatile__ (".machine push;\n"
>> +			      ".machine e500;\n"
>> +			      "tlbsx 0,%0;\n"
>> +			      ".machine pop;\n"
>> +			      : : "r" (addr), "m" (*addr));
>>  }
>>  
>>  /* return -1 if we didn't find anything */
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