On Wed, Jun 17, 2015 at 05:12:50PM +0100, James Cowgill wrote: > Fixes the assembler errors generated when compiling a MIPS R6 kernel with > CONFIG_KEXEC on, by replacing the offending add and sub instructions with > addiu instructions. > > Build errors: > arch/mips/kernel/relocate_kernel.S: Assembler messages: > arch/mips/kernel/relocate_kernel.S:27: Error: invalid operands `dadd $16,$16,8' > arch/mips/kernel/relocate_kernel.S:64: Error: invalid operands `dadd $20,$20,8' > arch/mips/kernel/relocate_kernel.S:65: Error: invalid operands `dadd $18,$18,8' > arch/mips/kernel/relocate_kernel.S:66: Error: invalid operands `dsub $22,$22,1' > scripts/Makefile.build:294: recipe for target 'arch/mips/kernel/relocate_kernel.o' failed > > Signed-off-by: James Cowgill <James.Cowgill@xxxxxxxxxx> > Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> # 4.0+ > --- > arch/mips/kernel/relocate_kernel.S | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S > index 74bab9d..c6bbf21 100644 > --- a/arch/mips/kernel/relocate_kernel.S > +++ b/arch/mips/kernel/relocate_kernel.S > @@ -24,7 +24,7 @@ LEAF(relocate_new_kernel) > > process_entry: > PTR_L s2, (s0) > - PTR_ADD s0, s0, SZREG > + PTR_ADDIU s0, s0, SZREG > > /* > * In case of a kdump/crash kernel, the indirection page is not > @@ -61,9 +61,9 @@ copy_word: > /* copy page word by word */ > REG_L s5, (s2) > REG_S s5, (s4) > - PTR_ADD s4, s4, SZREG > - PTR_ADD s2, s2, SZREG > - LONG_SUB s6, s6, 1 > + PTR_ADDIU s4, s4, SZREG > + PTR_ADDIU s2, s2, SZREG > + LONG_ADDIU s6, s6, -1 Thanks, applied. But I was wondering if maybe we should redefine the PTR_ADD, LONG_SUB etc macros to expand into a signed operation for R6. While I can't convince myself it's the right and conceptually clean thing to do, I don't think it'd be clearly wrong and it might help preventing numersous bugs by applications that use <asm/asm.h>. Opinions? Ralf
