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Mar 7, 2013 · WP Write Protect (bit 16 of CR0) — When set, inhibits supervisor-level procedures from writing into readonly pages; when clear, allows supervisor-level procedures to write into read-only. how to set control register 0 (cr0) bits in x86-64 using gcc assembly on linux Ask Question Asked 15 years, 4 months ago Modified 13 years, 3 months ago Aug 30, 2020 · mov eax, cr0 or eax, 0x10000 mov cr0, eax The OR with 0x10000 sets bit 16, the Write Protect bit. On early 32-bit x86 CPUs, code running at supervisor level (like the kernel) was always. Dec 14, 2020 · The reason CR0 is likely not appearing to update is because the optimizer probably assumed that the inline assembly in get_cr0 would result in the same value being returned in the first. Mar 26, 2020 · Yes, sensitive bits in CR0 and CR4 are pinned since version 5.3, at least via write_cr0 and write_cr4. Your code fails because the write_cr0 call doesn’t clear the WP bit. If you’re in.

Jun 4, 2015 · I would like to know the CR0-CR4 register values on x86. Can I write inline assembly to read it out? Are there any other methods? (e.g., does OS keep any file structures to record these. In other words: If the address "mov CR0,EAX" is located at address 0x0100:0x1200 then the next instruction executed will be at address 0x0100:0x1203. So switching to protected mode will only be.