Messages in this thread | | | Date | Mon, 19 Jun 2023 09:28:22 +0300 | Subject | Re: [PATCH v3 5/5] x86/entry: Make IA32 syscalls' availability depend on ia32_enabled() | From | Nikolay Borisov <> |
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On 19.06.23 г. 0:17 ч., Thomas Gleixner wrote: > On Fri, Jun 16 2023 at 15:57, Nikolay Borisov wrote: >> Another major aspect of supporting running of 32bit processes is the >> ability to access 32bit syscalls. Such syscalls are invoked either by >> using the legacy int 0x80 call gate interface or via the newer sysenter >> instruction. >> >> Ensure that if ia32 emulation is disabled (either at compile time or >> runtime) then those 2 syscall mechanisms are also disabled. > > AFAICT there are _three_ mechanisms for 32bit syscalls, no?
int 0x80 and sysenter make it 2? Which one is the 3rd one - the "native 64bit syscall" used in for X32 ABI ? This patch specifically deals with the first 2? > >> void __init idt_setup_traps(void) >> { >> idt_setup_from_table(idt_table, def_idts, ARRAY_SIZE(def_idts), true); >> + >> + if (ia32_enabled()) { >> + idt_setup_from_table(idt_table, ia32_idt, ARRAY_SIZE(ia32_idt), >> + true); > > Just let it stick out. The 80 character limit is history. > > Thanks, > > tglx
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