alt Hacker NewsOn some architectures there is a register reserved for assembler use, and even registers reserved for kernel use which can be changed in interrupt handlers and not changed back.
On some architectures there is a register reserved for assembler use, and even registers reserved for kernel use which can be changed in interrupt handlers and not changed back.
Yeah, I mentioned x18 on arm64 as an example for the latter one. Didn't know about the register reserved for assembly use, apparently MIPS indeed had that: $1, also known as $at, is the "assembler temporary".