Messages in this thread | | | From | Nick Desaulniers <> | Date | Mon, 10 Oct 2022 10:03:40 -0700 | Subject | Re: arch/arm/include/asm/xor.h:60:3: error: write to reserved register 'R7' |
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On Fri, Oct 7, 2022 at 6:16 AM kernel test robot <lkp@intel.com> wrote: > > Hi Ard, > > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
Thanks for the report. Filed https://github.com/ClangBuiltLinux/linux/issues/1732 to follow up on this.
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 4c86114194e644b6da9107d75910635c9e87179e > commit: d6800ca73a7d325627c045c16d7cfdc7465f4333 Revert "ARM: 9144/1: forbid ftrace with clang and thumb2_kernel" > date: 8 months ago > config: arm-randconfig-r013-20221007 > compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920) > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # install arm cross compiling tool for clang build > # apt-get install binutils-arm-linux-gnueabi > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6800ca73a7d325627c045c16d7cfdc7465f4333 > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout d6800ca73a7d325627c045c16d7cfdc7465f4333 > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash > > If you fix the issue, kindly add following tag where applicable > | Reported-by: kernel test robot <lkp@intel.com> > > All errors (new ones prefixed by >>): > > In file included from crypto/xor.c:17: > >> arch/arm/include/asm/xor.h:60:3: error: write to reserved register 'R7' > GET_BLOCK_4(p1); > ^ > arch/arm/include/asm/xor.h:20:10: note: expanded from macro 'GET_BLOCK_4' > __asm__("ldmia %0, {%1, %2, %3, %4}" \ > ^ > arch/arm/include/asm/xor.h:62:3: error: write to reserved register 'R7' > PUT_BLOCK_4(p1); > ^ > arch/arm/include/asm/xor.h:42:23: note: expanded from macro 'PUT_BLOCK_4' > __asm__ __volatile__("stmia %0!, {%2, %3, %4, %5}" \ > ^ > arch/arm/include/asm/xor.h:81:3: error: write to reserved register 'R7' > GET_BLOCK_4(p1); > ^ > arch/arm/include/asm/xor.h:20:10: note: expanded from macro 'GET_BLOCK_4' > __asm__("ldmia %0, {%1, %2, %3, %4}" \ > ^ > arch/arm/include/asm/xor.h:84:3: error: write to reserved register 'R7' > PUT_BLOCK_4(p1); > ^ > arch/arm/include/asm/xor.h:42:23: note: expanded from macro 'PUT_BLOCK_4' > __asm__ __volatile__("stmia %0!, {%2, %3, %4, %5}" \ > ^ > 4 errors generated. > > > vim +/R7 +60 arch/arm/include/asm/xor.h > > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 13 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 14 #define GET_BLOCK_2(dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 15 __asm__("ldmia %0, {%1, %2}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 16 : "=r" (dst), "=r" (a1), "=r" (a2) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 17 : "0" (dst)) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 18 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 19 #define GET_BLOCK_4(dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 20 __asm__("ldmia %0, {%1, %2, %3, %4}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 21 : "=r" (dst), "=r" (a1), "=r" (a2), "=r" (a3), "=r" (a4) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 22 : "0" (dst)) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 23 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 24 #define XOR_BLOCK_2(src) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 25 __asm__("ldmia %0!, {%1, %2}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 26 : "=r" (src), "=r" (b1), "=r" (b2) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 27 : "0" (src)); \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 28 __XOR(a1, b1); __XOR(a2, b2); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 29 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 30 #define XOR_BLOCK_4(src) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 31 __asm__("ldmia %0!, {%1, %2, %3, %4}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 32 : "=r" (src), "=r" (b1), "=r" (b2), "=r" (b3), "=r" (b4) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 33 : "0" (src)); \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 34 __XOR(a1, b1); __XOR(a2, b2); __XOR(a3, b3); __XOR(a4, b4) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 35 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 36 #define PUT_BLOCK_2(dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 37 __asm__ __volatile__("stmia %0!, {%2, %3}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 38 : "=r" (dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 39 : "0" (dst), "r" (a1), "r" (a2)) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 40 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 41 #define PUT_BLOCK_4(dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 42 __asm__ __volatile__("stmia %0!, {%2, %3, %4, %5}" \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 43 : "=r" (dst) \ > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 44 : "0" (dst), "r" (a1), "r" (a2), "r" (a3), "r" (a4)) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 45 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 46 static void > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 47 xor_arm4regs_2(unsigned long bytes, unsigned long *p1, unsigned long *p2) > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 48 { > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 49 unsigned int lines = bytes / sizeof(unsigned long) / 4; > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 50 register unsigned int a1 __asm__("r4"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 51 register unsigned int a2 __asm__("r5"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 52 register unsigned int a3 __asm__("r6"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 53 register unsigned int a4 __asm__("r7"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 54 register unsigned int b1 __asm__("r8"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 55 register unsigned int b2 __asm__("r9"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 56 register unsigned int b3 __asm__("ip"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 57 register unsigned int b4 __asm__("lr"); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 58 > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 59 do { > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 @60 GET_BLOCK_4(p1); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 61 XOR_BLOCK_4(p2); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 62 PUT_BLOCK_4(p1); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 63 } while (--lines); > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 64 } > ^1da177e4c3f41 include/asm-arm/xor.h Linus Torvalds 2005-04-16 65 > > :::::: The code at line 60 was first introduced by commit > :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 > > :::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org> > :::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org> > > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp
-- Thanks, ~Nick Desaulniers
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