On Mon, 2009-08-03 at 09:44 +0530, sumanth wrote: > How can i make sure my tool chain knows the difference between > global variable r0 and register r0.
The simple solution is to either add a prefix to variable names, or to add a prefix to register names. In ELF, the convention is to not add a prefix to variables names, we add a prefix to register names instead if we need one, e.g. %eax on i386, or $4 on mips. You can of course choose to add a prefix to variable names. It just isn't the convention. See for instance how the arm-elf port works when you use the -fleading-underscore option. A less simple solution is to have an assembler syntax that avoids ambiguity between register names and variable names. If for instance you have a move instruction that can accept either a register or a variable as source, then you have an ambiguity. You could instead have a load instruction for reading memory, and a move instruction for reading registers, and then you don't have an ambiguity anymore. You can also do things with addressing modes and relocation operators to reduce ambiguities. Jim
