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| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:58 +0100 |
| commit | 5fd4d16bd59a9fc84ca94c4fce4abc23fe219108 (patch) | |
| tree | 9d0312183af7070c027e5d0d4d1707cbc81c6c1b | |
| parent | ce90f340855d7a9b3bec24f0fe49a76904242387 (diff) | |
| download | linux-5fd4d16bd59a9fc84ca94c4fce4abc23fe219108.tar.bz2 | |
x86: x86-32 ptrace get/putreg current task
This generalizes the getreg and putreg functions so they can be used on the
current task, as well as on a task stopped in TASK_TRACED and switched off.
This lays the groundwork to share this code for all kinds of user-mode
machine state access, not just ptrace.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/ptrace_32.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c index 5aca84ef26d5..26071305de2c 100644 --- a/arch/x86/kernel/ptrace_32.c +++ b/arch/x86/kernel/ptrace_32.c @@ -55,6 +55,12 @@ static int putreg(struct task_struct *child, if (value && (value & 3) != 3) return -EIO; child->thread.gs = value; + if (child == current) + /* + * The user-mode %gs is not affected by + * kernel entry, so we must update the CPU. + */ + loadsegment(gs, value); return 0; case DS: case ES: @@ -104,6 +110,8 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno) break; case GS: retval = child->thread.gs; + if (child == current) + savesegment(gs, retval); break; case DS: case ES: |