Blackfin arch: Fix bug - hardware breakpoint doesn't always work in kgdb

Hardware breakpoint doesn't always work in kgdb. It works at the first
two times, but if you repeatedly trigger that hardware breakpoint, it
would slip over that point once in two times.

Fix it by always setting hw bp skip to 0. gdb does skip after hw bp trap.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
index ab40221..0c4c53f 100644 (file)
--- a/arch/blackfin/kernel/kgdb.c
+++ b/arch/blackfin/kernel/kgdb.c
@@ -219,6 +219,7 @@ int bfin_set_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
                if (bfin_type == breakinfo[breakno].type
                        && !breakinfo[breakno].occupied) {
                        breakinfo[breakno].occupied = 1;
+                       breakinfo[breakno].skip = 0;
                        breakinfo[breakno].enabled = 1;
                        breakinfo[breakno].addr = addr;
                        breakinfo[breakno].dataacc = dataacc;
@@ -426,17 +427,6 @@ int kgdb_arch_handle_exception(int vector, int signo,
                        kgdb_single_step = i + 1;
                }
 
-               if (vector == VEC_WATCH) {
-                       wp_status = bfin_read_WPSTAT();
-                       for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++) {
-                               if (wp_status & (1 << breakno)) {
-                                       breakinfo->skip = 1;
-                                       break;
-                               }
-                       }
-                       bfin_write_WPSTAT(0);
-               }
-
                bfin_correct_hw_break();
 
                return 0;