powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3S

Properly set the DABR_TRANSLATION/DABR_DATA_READ/DABR_DATA_READ bits in
the dabr when setting the debug register via PPC_PTRACE_SETHWDEBUG.  Also
don't reject trigger type of PPC_BREAKPOINT_TRIGGER_READ.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 16 insertions, 6 deletions

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index a9b32967cff6..906536998291 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1316,6 +1316,10 @@ static int set_dac_range(struct task_struct *child,
 static long ppc_set_hwdebug(struct task_struct *child,
                      struct ppc_hw_breakpoint *bp_info)
 {
+#ifndef CONFIG_PPC_ADV_DEBUG_REGS
+        unsigned long dabr;
+#endif
+
         if (bp_info->version != 1)
                 return -ENOTSUPP;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
@@ -1353,11 +1357,10 @@ static long ppc_set_hwdebug(struct task_struct *child,
         /*
          * We only support one data breakpoint
          */
-        if (((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0) ||
-            ((bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0) ||
-            (bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_WRITE) ||
-            (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) ||
-            (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
+        if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 ||
+            (bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 ||
+            bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT ||
+            bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
                 return -EINVAL;
 
         if (child->thread.dabr)
@@ -1366,7 +1369,14 @@ static long ppc_set_hwdebug(struct task_struct *child,
         if ((unsigned long)bp_info->addr >= TASK_SIZE)
                 return -EIO;
 
-        child->thread.dabr = (unsigned long)bp_info->addr;
+        dabr = (unsigned long)bp_info->addr & ~7UL;
+        dabr |= DABR_TRANSLATION;
+        if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
+                dabr |= DABR_DATA_READ;
+        if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
+                dabr |= DABR_DATA_WRITE;
+
+        child->thread.dabr = dabr;
 
         return 1;
 #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */