From 527d08631b30fb99721274eab8ebabd9c54b0b25 Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Tue, 18 Oct 2022 20:50:59 +0100 Subject: ARM: 9260/1: lib/xor: use r10 rather than r7 in xor_arm4regs_{2|3} kbuild test robot reports: In file included from crypto/xor.c:17: ./arch/arm/include/asm/xor.h:61:3: 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:63:3: 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:83:3: 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:86:3: 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}" ^ Thumb2 uses r7 rather than r11 as the frame pointer. Let's use r10 rather than r7 for these temporaries. Link: https://github.com/ClangBuiltLinux/linux/issues/1732 Link: https://lore.kernel.org/llvm/202210072120.V1O2SuKY-lkp@intel.com/ Reported-by: kernel test robot Suggested-by: Ard Biesheuvel Reviewed-by: Ard Biesheuvel Signed-off-by: Nick Desaulniers Signed-off-by: Russell King (Oracle) --- arch/arm/include/asm/xor.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/xor.h b/arch/arm/include/asm/xor.h index 669cad5194d3..934b549905f5 100644 --- a/arch/arm/include/asm/xor.h +++ b/arch/arm/include/asm/xor.h @@ -51,7 +51,7 @@ xor_arm4regs_2(unsigned long bytes, unsigned long * __restrict p1, register unsigned int a1 __asm__("r4"); register unsigned int a2 __asm__("r5"); register unsigned int a3 __asm__("r6"); - register unsigned int a4 __asm__("r7"); + register unsigned int a4 __asm__("r10"); register unsigned int b1 __asm__("r8"); register unsigned int b2 __asm__("r9"); register unsigned int b3 __asm__("ip"); @@ -73,7 +73,7 @@ xor_arm4regs_3(unsigned long bytes, unsigned long * __restrict p1, register unsigned int a1 __asm__("r4"); register unsigned int a2 __asm__("r5"); register unsigned int a3 __asm__("r6"); - register unsigned int a4 __asm__("r7"); + register unsigned int a4 __asm__("r10"); register unsigned int b1 __asm__("r8"); register unsigned int b2 __asm__("r9"); register unsigned int b3 __asm__("ip"); -- cgit v1.2.3