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authorRoland McGrath <roland@redhat.com>2008-07-25 19:45:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 12:00:09 -0700
commit828c365cc8b8d38c346fccb19fa80d28f2240831 (patch)
treecedb0f1ce389f4b12d7b0975ce52c8af7939cfcd /include/linux/tracehook.h
parent64b1208d5b0ef8859fd52ea7ae286a3eb994669b (diff)
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tracehook: asm/syscall.h
This adds asm-generic/syscall.h, which documents what a real asm-ARCH/syscall.h file should define. This is not used yet, but will provide all the machine-dependent details of examining a user system call about to begin, in progress, or just ended. Each arch should add an asm-ARCH/syscall.h that defines all the entry points documented in asm-generic/syscall.h, as short inlines if possible. This lets us write new tracing code that understands user system call registers, without any new arch-specific work. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/tracehook.h')
-rw-r--r--include/linux/tracehook.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 32867ab..589f429 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -103,7 +103,8 @@ static inline void ptrace_report_syscall(struct pt_regs *regs)
* the system call. That must prevent normal entry so no system call is
* made. If @task ever returns to user mode after this, its register state
* is unspecified, but should be something harmless like an %ENOSYS error
- * return.
+ * return. It should preserve enough information so that syscall_rollback()
+ * can work (see asm-generic/syscall.h).
*
* Called without locks, just after entering kernel mode.
*/
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