I’m not sure what this inline assembly does:
asm ("mov %%esp, %0" : "=g" (esp));
especially the : "=g" (esp) part.
I’m not sure what this inline assembly does: asm (mov %%esp, %0 : =g
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I’m not sure what this inline assembly does:
asm ("mov %%esp, %0" : "=g" (esp));
especially the : "=g" (esp) part.
"=g" (esp)defines an output for the inline assembly. Thegtells the compiler that it can use any general register, or memory, to store the result. The(esp)means that the result will be stored in the c variable namedesp.mov %%esp, %0is the assembly command, which simply moves the stack pointer into the 0th operand (the output). Therefore, this assembly simply stores the stack pointer in the variable namedesp.