I have known that from glibc-2.3.1-25, SYSENTER is supported as the default.
Now, My OS is Fedora 8(kernel version:
linux-2.6.23), and glibc-2.7-2 is the default. When I compile C program,
this is the debug result by gdb:
(gdb) disas __kernel_vsyscall
Dump of assembler code for function __kernel_vsyscall:
0xb7f7a400 <__kernel_vsyscall+0>: int $0x80
0xb7f7a402 <__kernel_vsyscall+2>: ret
End of assembler dump.
The system call is implemented by int $80h, rather than SYSENTER. What
is the reason? How to set SYSENTER as the default implementation of system
call? Thank you for your response!
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