diff options
| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-03-23 05:59:48 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-23 10:38:06 -0500 |
| commit | be0a39120cb6b88bd085a3a280f5c769a3ed85ad (patch) | |
| tree | 39a882518d67f22894cdec615db32aad2b070f73 /arch/i386/kernel/vsyscall-sysenter.S | |
| parent | 635cf99a80f4ebee59d70eb64bb85ce829e4591f (diff) | |
[PATCH] i386: more vsyscall documentation
Document a limitation of vsyscall-sysenter, since patches to fix it have
been rejected.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/vsyscall-sysenter.S')
| -rw-r--r-- | arch/i386/kernel/vsyscall-sysenter.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/i386/kernel/vsyscall-sysenter.S b/arch/i386/kernel/vsyscall-sysenter.S index 76b728159403..3b62baa6a371 100644 --- a/arch/i386/kernel/vsyscall-sysenter.S +++ b/arch/i386/kernel/vsyscall-sysenter.S | |||
| @@ -21,6 +21,9 @@ | |||
| 21 | * instruction clobbers %esp, the user's %esp won't even survive entry | 21 | * instruction clobbers %esp, the user's %esp won't even survive entry |
| 22 | * into the kernel. We store %esp in %ebp. Code in entry.S must fetch | 22 | * into the kernel. We store %esp in %ebp. Code in entry.S must fetch |
| 23 | * arg6 from the stack. | 23 | * arg6 from the stack. |
| 24 | * | ||
| 25 | * You can not use this vsyscall for the clone() syscall because the | ||
| 26 | * three dwords on the parent stack do not get copied to the child. | ||
| 24 | */ | 27 | */ |
| 25 | .text | 28 | .text |
| 26 | .globl __kernel_vsyscall | 29 | .globl __kernel_vsyscall |