Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5fd4d16bd59a9fc84ca94c4fce4abc23fe219108
Commit: 5fd4d16bd59a9fc84ca94c4fce4abc23fe219108
Parent: ce90f340855d7a9b3bec24f0fe49a76904242387
Author: Roland McGrath <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:30:58 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:30:58 2008 +0100
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 <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
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 5aca84e..2607130 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:
-
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