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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-11-27 07:02:40 -0500
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2008-01-25 02:31:39 -0500
commit6ea6dd93c9454cc9521134f907bc970d09f460e4 (patch)
tree05f8d9f293d7127e19774d5fa10ebf685a6fa76d /kernel
parent7f0f616bb093823b70855685cf085d39a8784818 (diff)
ptrace: Call arch_ptrace_attach() when request=PTRACE_TRACEME
arch_ptrace_attach() is a hook that allows the architecture to do book-keeping after a ptrace attach. This patch adds a call to this hook when handling a PTRACE_TRACEME request as well. Currently only one architecture, m32r, implements this hook. When called, it initializes a number of debug trap slots in the ptraced task's thread struct, and it looks to me like this is the right thing to do after a PTRACE_TRACEME request as well, not only after PTRACE_ATTACH. Please correct me if I'm wrong. I want to use this hook on AVR32 to turn the debugging hardware on when a process is actually being debugged and keep it off otherwise. To be able to do this, I need to intercept PTRACE_TRACEME and PTRACE_ATTACH, as well as PTRACE_DETACH and thread exit. The latter two can be handled by existing hooks. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/ptrace.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c25db863081..c719bb9d79a 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -470,6 +470,8 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
470 lock_kernel(); 470 lock_kernel();
471 if (request == PTRACE_TRACEME) { 471 if (request == PTRACE_TRACEME) {
472 ret = ptrace_traceme(); 472 ret = ptrace_traceme();
473 if (!ret)
474 arch_ptrace_attach(current);
473 goto out; 475 goto out;
474 } 476 }
475 477