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I'm a bit confused as to what the asm instruction db actually does. I've read that it defines a byte, but what does that actually mean? Does it move the value into a certain place in memory, or does it predefine a value before the code is assembled?
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The DB statement initializes memory with one or more byte values. label is a symbol that is assigned the current memory address. expression is a byte value that is stored in memory. Each expression may be a symbol, a string, or an expression.
DB - Define Byte. 8 bits. DW - Define Word. Generally 2 bytes on a typical x86 32-bit system.
msg is a global variable pointing to the string that follows - the db means data byte , indicating that the assembler should just emit the literal bytes that follow. len is being set to the length of the string (more below).
An assembler instruction is a request to the assembler to do certain operations during the assembly of a source module; for example, defining data constants, reserving storage areas, and defining the end of the source module.
It literally places that byte right there in the executable.
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