As we walked home, my 15-year-old son asked: “Is it OK to talk to people in that way?” “What way?” He was asking about the boundaries when it comes to talking to someone about their home country.
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It worked! The middle print statements prove that the value 0x41414140 was successfully written and read from memory. The last print shows that a SIGTRAP was delivered to our process when we called getchar after patching it.
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32 entries may sound small by modern standards (current x86 processors have thousands of TLB entries), but it covers 128 KB of memory -- enough for the working set of most 1980s programs. A TLB miss is not catastrophic either; the hardware page walker handles it transparently in about 20 cycles.