[lkml]   [2012]   [Apr]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: syscall descriptor table
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.

suse labs

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2012-04-06 10:27    [W:0.066 / U:2.304 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site