c - How to get the value of stack pointer? (MIPS GCC) -


i trying call stack, reason following code returns wrong stack pointer: 

        unsigned int stack_pointer = 0;         __asm("la  $26,  %[spaddr]\n\t"               "or  $27,  $0,  $sp\n\t"               "sw  $27,  0($26)\n\t"               "nop"::[spaddr] "m" (stack_pointer));         return stack_pointer;

what missing here?

to stack pointer use proper output constraint so:

register unsigned sp asm("29"); asm("" : "=r" (sp));

note mips uses register return address, of course non-leaf functions might store on stack.

to implement backtrace, can use builtins __builtin_return_address , __builtin_extract_return_addr described in gcc manual.

also, if glibc available, has backtrace function, see man backtrace.


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