Hi, I try to disassemble a simple program on x64 Linux using GDB.
The test program is like:
main() { getuid(); }
"disassemble main" shows that getuid() corresponds to "callq *addr*". But when I try to "disassemble getuid" or "disassemble *addr*", GDB says it is not a vaild function address. Why, while it is ok on x86 Linux? Is callq a new instruction added by x86-64? What is the difference to the call instruction? Another question: do I need to use a 32-bit GDB to debug 32-bit program? Thanks, Shen