powerpc/booke: Fix breakpoint/watchpoint one-shot behavior

Another fix for the extended ptrace patches in the -next tree.

The handling of breakpoints and watchpoints is inconsistent.  When a
breakpoint or watchpoint is hit, the interrupt handler is clearing the
proper bits in the dbcr* registers, but leaving the dac* and iac* registers
alone.  The ptrace code to delete the break/watchpoints checks the dac* and
iac* registers for zero to determine if they are enabled.  Instead, they
should check the dbcr* bits.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 0efa2e3..ed2cfe1 100644 (file)
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -940,7 +940,7 @@ static int del_instruction_bp(struct task_struct *child, int slot)
 {
        switch (slot) {
        case 1:
-               if (child->thread.iac1 == 0)
+               if ((child->thread.dbcr0 & DBCR0_IAC1) == 0)
                        return -ENOENT;
 
                if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
@@ -952,7 +952,7 @@ static int del_instruction_bp(struct task_struct *child, int slot)
                child->thread.dbcr0 &= ~DBCR0_IAC1;
                break;
        case 2:
-               if (child->thread.iac2 == 0)
+               if ((child->thread.dbcr0 & DBCR0_IAC2) == 0)
                        return -ENOENT;
 
                if (dbcr_iac_range(child) & DBCR_IAC12MODE)
@@ -963,7 +963,7 @@ static int del_instruction_bp(struct task_struct *child, int slot)
                break;
 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
        case 3:
-               if (child->thread.iac3 == 0)
+               if ((child->thread.dbcr0 & DBCR0_IAC3) == 0)
                        return -ENOENT;
 
                if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
@@ -975,7 +975,7 @@ static int del_instruction_bp(struct task_struct *child, int slot)
                child->thread.dbcr0 &= ~DBCR0_IAC3;
                break;
        case 4:
-               if (child->thread.iac4 == 0)
+               if ((child->thread.dbcr0 & DBCR0_IAC4) == 0)
                        return -ENOENT;
 
                if (dbcr_iac_range(child) & DBCR_IAC34MODE)
@@ -1054,7 +1054,7 @@ static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
 static int del_dac(struct task_struct *child, int slot)
 {
        if (slot == 1) {
-               if (child->thread.dac1 == 0)
+               if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
                        return -ENOENT;
 
                child->thread.dac1 = 0;
@@ -1070,7 +1070,7 @@ static int del_dac(struct task_struct *child, int slot)
                child->thread.dvc1 = 0;
 #endif
        } else if (slot == 2) {
-               if (child->thread.dac2 == 0)
+               if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
                        return -ENOENT;
 
 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE