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The asm-offsets mechanism generates signed numbers, even if the input value is explicitly unsigned. This causes a problem with older binutils (e.g. 2.23), which sign-extend a negative number when @h is applied. Thus, this instruction: cmpli cr0, r11, VIRT_IMMR_BASE@h resulted in this: Error: operand out of range (0xfffffff0 is not between 0x00000000 and 0x0000ffff) By casting to a larger type, we can force the output to be expressed as a positive number. Signed-off-by: Scott Wood <oss@buserror.net> Cc: Christophe Leroy <christophe.leroy@c-s.fr>