1 files changed, 21 insertions, 7 deletions

diff --git a/arch/ppc/xmon/xmon.c b/arch/ppc/xmon/xmon.c
index 37d234f93394..b1a91744fd2d 100644
--- a/arch/ppc/xmon/xmon.c
+++ b/arch/ppc/xmon/xmon.c
@@ -153,6 +153,12 @@ static int xmon_trace[NR_CPUS];
 #define SSTEP   1               /* stepping because of 's' command */
 #define BRSTEP  2               /* stepping over breakpoint */
 
+#ifdef CONFIG_4xx
+#define MSR_SSTEP_ENABLE 0x200
+#else
+#define MSR_SSTEP_ENABLE 0x400
+#endif
+
 static struct pt_regs *xmon_regs[NR_CPUS];
 
 extern inline void sync(void)
@@ -211,6 +217,14 @@ static void get_tb(unsigned *p)
         p[1] = lo;
 }
 
+static inline void xmon_enable_sstep(struct pt_regs *regs)
+{
+        regs->msr |= MSR_SSTEP_ENABLE;
+#ifdef CONFIG_4xx
+        mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
+#endif
+}
+
 int xmon(struct pt_regs *excp)
 {
         struct pt_regs regs;
@@ -254,10 +268,10 @@ int xmon(struct pt_regs *excp)
         cmd = cmds(excp);
         if (cmd == 's') {
                 xmon_trace[smp_processor_id()] = SSTEP;
-                excp->msr |= 0x400;
+                xmon_enable_sstep(excp);
         } else if (at_breakpoint(excp->nip)) {
                 xmon_trace[smp_processor_id()] = BRSTEP;
-                excp->msr |= 0x400;
+                xmon_enable_sstep(excp);
         } else {
                 xmon_trace[smp_processor_id()] = 0;
                 insert_bpts();
@@ -298,7 +312,7 @@ xmon_bpt(struct pt_regs *regs)
                 remove_bpts();
                 excprint(regs);
                 xmon_trace[smp_processor_id()] = BRSTEP;
-                regs->msr |= 0x400;
+                xmon_enable_sstep(regs);
         } else {
                 xmon(regs);
         }
@@ -385,7 +399,7 @@ insert_bpts(void)
                 }
                 store_inst((void *) bp->address);
         }
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
         if (dabr.enabled)
                 set_dabr(dabr.address);
         if (iabr.enabled)
@@ -400,7 +414,7 @@ remove_bpts(void)
         struct bpt *bp;
         unsigned instr;
 
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
         set_dabr(0);
         set_iabr(0);
 #endif
@@ -677,7 +691,7 @@ bpt_cmds(void)
 
         cmd = inchar();
         switch (cmd) {
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
         case 'd':
                 mode = 7;
                 cmd = inchar();
@@ -792,7 +806,7 @@ backtrace(struct pt_regs *excp)
         for (; sp != 0; sp = stack[0]) {
                 if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
                         break;
-                printf("[%.8lx] ", stack);
+                printf("[%.8lx] ", stack[0]);
                 xmon_print_symbol(stack[1], " ", "\n");
                 if (stack[1] == (unsigned) &ret_from_except
                     || stack[1] == (unsigned) &ret_from_except_full