nommu: ptrace support

The patch below adds ARM ptrace functions to get the process load address.
This is required for useful userspace debugging on mmuless systems.  These
values are obtained by reading magic offsets with PTRACE_PEEKUSR, as on other
nommu targets. I picked arbitrary large values for the offsets.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 89882a1d0187..a2ea3854cb3c 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -521,7 +521,13 @@ static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
                 return -EIO;
 
         tmp = 0;
-        if (off < sizeof(struct pt_regs))
+        if (off == PT_TEXT_ADDR)
+                tmp = tsk->mm->start_code;
+        else if (off == PT_DATA_ADDR)
+                tmp = tsk->mm->start_data;
+        else if (off == PT_TEXT_END_ADDR)
+                tmp = tsk->mm->end_code;
+        else if (off < sizeof(struct pt_regs))
                 tmp = get_user_reg(tsk, off >> 2);
 
         return put_user(tmp, ret);