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authorbibo,mao <bibo.mao@intel.com>2007-01-31 04:50:31 -0500
committerTony Luck <tony.luck@intel.com>2007-02-05 16:49:29 -0500
commit90f9d70a582c02f50b4dd847166cd5b037219891 (patch)
treeffe6b5246f9e2334b474ca0913776668803d1ea0 /include/asm-ia64/thread_info.h
parentc237508afa5d47282d3047784864013eebdc68ab (diff)
[IA64] enable singlestep on system call
As is pointed out in http://www.gelato.org/community/view_linear.php?id=1_1036&from=authors&value=Ian%20Wienand#1_1039, if single step on break instruction, the break fault has higher priority than the single-step trap. When the break fault handler is entered, it advances the IP by 1 instruction so break instruction single-stepping is skipped, actually it is next instruction which is single stepped. This patch modifies this, it adds TIF_SINGLESTEP bit for thread flags, and generate a fake sigtrap when single stepping break instruction. Test case in attachment can verify this. Any comments is welcome. Signed-off-by: bibo, mao <bibo.mao@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/thread_info.h')
-rw-r--r--include/asm-ia64/thread_info.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-ia64/thread_info.h b/include/asm-ia64/thread_info.h
index 9b505b25544f..91698599f918 100644
--- a/include/asm-ia64/thread_info.h
+++ b/include/asm-ia64/thread_info.h
@@ -84,6 +84,7 @@ struct thread_info {
84#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 84#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
85#define TIF_SYSCALL_TRACE 3 /* syscall trace active */ 85#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
86#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 86#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
87#define TIF_SINGLESTEP 5 /* restore singlestep on return to user mode */
87#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 88#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
88#define TIF_MEMDIE 17 89#define TIF_MEMDIE 17
89#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */ 90#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
@@ -92,7 +93,8 @@ struct thread_info {
92 93
93#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 94#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
94#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 95#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
95#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) 96#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
97#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
96#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 98#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
97#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 99#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
98#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 100#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)