Messages in this thread | | | Date | Fri, 06 Apr 2012 10:24:44 +0200 | From | Jiri Slaby <> | Subject | Re: syscall descriptor table |
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On 04/05/2012 11:55 PM, Xin Tong wrote: > Can anyone please describe to me how x86 syscall works ( i.e. how it > is dispatched to the correct function) on x86 ? > > mov $1, %eax ;; __NR_exit = 1 > mov $42, %ebx ;; status = 42 > sysenter ;; perform the syscall! > > what does the sysenter instruction do ? what is the difference aganst int 0x80.
Please refer to some processor manual. For example: Intel 64 and IA-32 Architectures Software Developer’s Manual. For the entry point see ia32_sysenter_target in arch/x86/kernel/entry_32.S for x86_32 or arch/x86/ia32/ia32entry.S for x86_64 with 32-bit binary.
regards, -- js suse labs
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