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authorMichal Simek <monstr@monstr.eu>2009-08-24 13:26:04 +0200
committerMichal Simek <monstr@monstr.eu>2009-09-22 10:00:45 +0200
commit235754834b6818e727d6b8e240c4ec7f79e2f457 (patch)
treea58160000a994c22f41abdbcb783dc076c9ae7a0 /arch/microblaze/kernel/ptrace.c
parentf97b4f7de4a4d92e578845d517660942e851ca4f (diff)
downloadop-kernel-dev-235754834b6818e727d6b8e240c4ec7f79e2f457.zip
op-kernel-dev-235754834b6818e727d6b8e240c4ec7f79e2f457.tar.gz
microblaze: Support ptrace syscall tracing.
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/ptrace.c')
-rw-r--r--arch/microblaze/kernel/ptrace.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/ptrace.c b/arch/microblaze/kernel/ptrace.c
index 53ff39a..4b3ac32 100644
--- a/arch/microblaze/kernel/ptrace.c
+++ b/arch/microblaze/kernel/ptrace.c
@@ -29,6 +29,10 @@
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
+#include <linux/elf.h>
+#include <linux/audit.h>
+#include <linux/seccomp.h>
+#include <linux/tracehook.h>
#include <linux/errno.h>
#include <asm/processor.h>
@@ -174,6 +178,64 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
return rval;
}
+asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
+{
+ long ret = 0;
+
+ secure_computing(regs->r12);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+ tracehook_report_syscall_entry(regs))
+ /*
+ * Tracing decided this syscall should not happen.
+ * We'll return a bogus call number to get an ENOSYS
+ * error, but leave the original number in regs->regs[0].
+ */
+ ret = -1L;
+
+ if (unlikely(current->audit_context))
+ audit_syscall_entry(EM_XILINX_MICROBLAZE, regs->r12,
+ regs->r5, regs->r6,
+ regs->r7, regs->r8);
+
+ return ret ?: regs->r12;
+}
+
+asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
+{
+ int step;
+
+ if (unlikely(current->audit_context))
+ audit_syscall_exit(AUDITSC_RESULT(regs->r3), regs->r3);
+
+ step = test_thread_flag(TIF_SINGLESTEP);
+ if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, step);
+}
+
+#if 0
+static asmlinkage void syscall_trace(void)
+{
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+ /* The 0x80 provides a way for the tracing parent to distinguish
+ between a syscall stop and SIGTRAP delivery */
+ ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
+ ? 0x80 : 0));
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
+#endif
+
void ptrace_disable(struct task_struct *child)
{
/* nothing to do */
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