arm64: hw_breakpoint: use target state to determine ABI behaviour

The arm64 hw_breakpoint interface is slightly less flexible than its
32-bit counterpart, thanks to some changes in the architecture rendering
unaligned watchpoint addresses obselete for AArch64.

However, in a multi-arch environment (i.e. debugging a 32-bit target
with a 64-bit GDB under a 64-bit kernel), we need to provide a feature
compatible interface to GDB in order for debugging to function correctly.

This patch adds a new helper, is_compat_bp,  to our hw_breakpoint
implementation which changes the interface behaviour based on the
architecture of the debug target as opposed to the debugger itself.
This allows debugged to function as expected for multi-arch
configurations without relying on deprecated architectural behaviours
when debugging native applications.

Cc: Yao Qi <yao.qi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index bba85c8..46465d9 100644 (file)
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -163,6 +163,20 @@ enum hw_breakpoint_ops {
        HW_BREAKPOINT_RESTORE
 };
 
+static int is_compat_bp(struct perf_event *bp)
+{
+       struct task_struct *tsk = bp->hw.target;
+
+       /*
+        * tsk can be NULL for per-cpu (non-ptrace) breakpoints.
+        * In this case, use the native interface, since we don't have
+        * the notion of a "compat CPU" and could end up relying on
+        * deprecated behaviour if we use unaligned watchpoints in
+        * AArch64 state.
+        */
+       return tsk && is_compat_thread(task_thread_info(tsk));
+}
+
 /**
  * hw_breakpoint_slot_setup - Find and setup a perf slot according to
  *                           operations
@@ -420,7 +434,7 @@ static int arch_build_bp_info(struct perf_event *bp)
         * Watchpoints can be of length 1, 2, 4 or 8 bytes.
         */
        if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
-               if (is_compat_task()) {
+               if (is_compat_bp(bp)) {
                        if (info->ctrl.len != ARM_BREAKPOINT_LEN_2 &&
                            info->ctrl.len != ARM_BREAKPOINT_LEN_4)
                                return -EINVAL;
@@ -477,7 +491,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
         * AArch32 tasks expect some simple alignment fixups, so emulate
         * that here.
         */
-       if (is_compat_task()) {
+       if (is_compat_bp(bp)) {
                if (info->ctrl.len == ARM_BREAKPOINT_LEN_8)
                        alignment_mask = 0x7;
                else