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authorPetr Tesarik <ptesarik@suse.cz>2008-02-11 22:42:00 +0100
committerTony Luck <tony.luck@intel.com>2008-03-05 15:47:53 -0800
commit08b23d74e07ac053fe4a5d6f4a48e8048fcfe52b (patch)
tree0e758c5d215d7b5865617e542510d33c7e27bc7b /arch/ia64
parent[IA64] access user RBS directly (diff)
downloadlinux-dev-08b23d74e07ac053fe4a5d6f4a48e8048fcfe52b.tar.xz
linux-dev-08b23d74e07ac053fe4a5d6f4a48e8048fcfe52b.zip
[IA64] do not sync RBS when changing PT_AR_BSP or PT_CFM
Syncing is no longer needed, because user RBS is already up-to-date. Actually, if a debugger modified the contents of the original RBS prior to changing PT_AR_BSP, the modifications would get overwritten. Signed-off-by: Petr Tesarik <ptesarik@suse.cz> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/ptrace.c19
1 files changed, 3 insertions, 16 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 9d2591423eb7..54b7ea551559 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1011,14 +1011,9 @@ access_uarea (struct task_struct *child, unsigned long addr,
* the kernel was entered.
*
* Furthermore, when changing the contents of
- * PT_AR_BSP (or PT_CFM) we MUST copy any
- * users-level stacked registers that are
- * stored on the kernel stack back to
- * user-space because otherwise, we might end
- * up clobbering kernel stacked registers.
- * Also, if this happens while the task is
- * blocked in a system call, which convert the
- * state such that the non-system-call exit
+ * PT_AR_BSP (or PT_CFM) while the task is
+ * blocked in a system call, convert the state
+ * so that the non-system-call exit
* path is used. This ensures that the proper
* state will be picked up when resuming
* execution. However, it *also* means that
@@ -1035,10 +1030,6 @@ access_uarea (struct task_struct *child, unsigned long addr,
urbs_end = ia64_get_user_rbs_end(child, pt, &cfm);
if (write_access) {
if (*data != urbs_end) {
- if (ia64_sync_user_rbs(child, sw,
- pt->ar_bspstore,
- urbs_end) < 0)
- return -1;
if (in_syscall(pt))
convert_to_non_syscall(child,
pt,
@@ -1058,10 +1049,6 @@ access_uarea (struct task_struct *child, unsigned long addr,
urbs_end = ia64_get_user_rbs_end(child, pt, &cfm);
if (write_access) {
if (((cfm ^ *data) & PFM_MASK) != 0) {
- if (ia64_sync_user_rbs(child, sw,
- pt->ar_bspstore,
- urbs_end) < 0)
- return -1;
if (in_syscall(pt))
convert_to_non_syscall(child,
pt,