return 0;
}
-void __set_breakpoint(int nr, struct arch_hw_breakpoint *brk)
+static void set_hw_breakpoint(int nr, struct arch_hw_breakpoint *brk)
{
- memcpy(this_cpu_ptr(¤t_brk[nr]), brk, sizeof(*brk));
-
if (dawr_enabled())
// Power8 or later
set_dawr(nr, brk);
WARN_ON_ONCE(1);
}
+void __set_breakpoint(int nr, struct arch_hw_breakpoint *brk)
+{
+ memcpy(this_cpu_ptr(¤t_brk[nr]), brk, sizeof(*brk));
+ set_hw_breakpoint(nr, brk);
+}
+
/* Check if we have DAWR or DABR hardware */
bool ppc_breakpoint_available(void)
{
}
EXPORT_SYMBOL_GPL(ppc_breakpoint_available);
+/* Disable the breakpoint in hardware without touching current_brk[] */
+void suspend_breakpoints(void)
+{
+ struct arch_hw_breakpoint brk = {0};
+ int i;
+
+ if (!ppc_breakpoint_available())
+ return;
+
+ for (i = 0; i < nr_wp_slots(); i++)
+ set_hw_breakpoint(i, &brk);
+}
+
+/*
+ * Re-enable breakpoints suspended by suspend_breakpoints() in hardware
+ * from current_brk[]
+ */
+void restore_breakpoints(void)
+{
+ int i;
+
+ if (!ppc_breakpoint_available())
+ return;
+
+ for (i = 0; i < nr_wp_slots(); i++)
+ set_hw_breakpoint(i, this_cpu_ptr(¤t_brk[i]));
+}
+
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
static inline bool tm_enabled(struct task_struct *tsk)
unsigned long nip = regs->nip;
unsigned long pc = regs->nip - (NR_INSN_TO_PRINT * 3 / 4 * sizeof(int));
- printk("Instruction dump:");
+ printk("Code: ");
/*
* If we were executing with the MMU off for instructions, adjust pc
for (i = 0; i < NR_INSN_TO_PRINT; i++) {
int instr;
- if (!(i % 8))
- pr_cont("\n");
-
if (!__kernel_text_address(pc) ||
get_kernel_nofault(instr, (const void *)pc)) {
pr_cont("XXXXXXXX ");
klp_init_thread_info(p);
+ /* Create initial stack frame. */
+ sp -= STACK_USER_INT_FRAME_SIZE;
+ *(unsigned long *)(sp + STACK_INT_FRAME_MARKER) = STACK_FRAME_REGS_MARKER;
+
/* Copy registers */
- sp -= sizeof(struct pt_regs);
- childregs = (struct pt_regs *) sp;
+ childregs = (struct pt_regs *)(sp + STACK_INT_FRAME_REGS);
if (unlikely(args->fn)) {
/* kernel thread */
+ ((unsigned long *)sp)[0] = 0;
memset(childregs, 0, sizeof(struct pt_regs));
- childregs->gpr[1] = sp + sizeof(struct pt_regs);
+ childregs->gpr[1] = sp + STACK_USER_INT_FRAME_SIZE;
/* function */
if (args->fn)
childregs->gpr[14] = ppc_function_entry((void *)args->fn);
*childregs = *regs;
if (usp)
childregs->gpr[1] = usp;
+ ((unsigned long *)sp)[0] = childregs->gpr[1];
p->thread.regs = childregs;
/* 64s sets this in ret_from_fork */
if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64))
f = ret_from_fork;
}
childregs->msr &= ~(MSR_FP|MSR_VEC|MSR_VSX);
- sp -= STACK_FRAME_OVERHEAD;
/*
* The way this works is that at some point in the future
* do some house keeping and then return from the fork or clone
* system call, using the stack frame created above.
*/
- ((unsigned long *)sp)[0] = 0;
- sp -= sizeof(struct pt_regs);
- kregs = (struct pt_regs *) sp;
- sp -= STACK_FRAME_OVERHEAD;
+ ((unsigned long *)sp)[STACK_FRAME_LR_SAVE] = (unsigned long)f;
+ sp -= STACK_SWITCH_FRAME_SIZE;
+ ((unsigned long *)sp)[0] = sp + STACK_SWITCH_FRAME_SIZE;
+ kregs = (struct pt_regs *)(sp + STACK_SWITCH_FRAME_REGS);
p->thread.ksp = sp;
+
#ifdef CONFIG_HAVE_HW_BREAKPOINT
for (i = 0; i < nr_wp_slots(); i++)
p->thread.ptrace_bps[i] = NULL;
return 0;
}
-
-int validate_sp(unsigned long sp, struct task_struct *p,
- unsigned long nbytes)
+/*
+ * validate the stack frame of a particular minimum size, used for when we are
+ * looking at a certain object in the stack beyond the minimum.
+ */
+int validate_sp_size(unsigned long sp, struct task_struct *p,
+ unsigned long nbytes)
{
unsigned long stack_page = (unsigned long)task_stack_page(p);
return valid_emergency_stack(sp, p, nbytes);
}
-EXPORT_SYMBOL(validate_sp);
+int validate_sp(unsigned long sp, struct task_struct *p)
+{
+ return validate_sp_size(sp, p, STACK_FRAME_MIN_SIZE);
+}
static unsigned long ___get_wchan(struct task_struct *p)
{
int count = 0;
sp = p->thread.ksp;
- if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD))
+ if (!validate_sp(sp, p))
return 0;
do {
sp = READ_ONCE_NOCHECK(*(unsigned long *)sp);
- if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD) ||
- task_is_running(p))
+ if (!validate_sp(sp, p) || task_is_running(p))
return 0;
if (count > 0) {
ip = READ_ONCE_NOCHECK(((unsigned long *)sp)[STACK_FRAME_LR_SAVE]);
lr = 0;
printk("%sCall Trace:\n", loglvl);
do {
- if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD))
+ if (!validate_sp(sp, tsk))
break;
stack = (unsigned long *) sp;
/*
* See if this is an exception frame.
- * We look for the "regshere" marker in the current frame.
+ * We look for the "regs" marker in the current frame.
+ *
+ * STACK_SWITCH_FRAME_SIZE being the smallest frame that
+ * could hold a pt_regs, if that does not fit then it can't
+ * have regs.
*/
- if (validate_sp(sp, tsk, STACK_FRAME_WITH_PT_REGS)
- && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) {
+ if (validate_sp_size(sp, tsk, STACK_SWITCH_FRAME_SIZE)
+ && stack[STACK_INT_FRAME_MARKER_LONGS] == STACK_FRAME_REGS_MARKER) {
struct pt_regs *regs = (struct pt_regs *)
- (sp + STACK_FRAME_OVERHEAD);
+ (sp + STACK_INT_FRAME_REGS);
lr = regs->link;
printk("%s--- interrupt: %lx at %pS\n",
projects / linux-block.git / blobdiff