summaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/kernel/ptrace.c')
-rw-r--r--arch/arm/kernel/ptrace.c113
1 files changed, 47 insertions, 66 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index a2ea3854cb3..3f562a7c0a9 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -452,12 +452,23 @@ void ptrace_cancel_bpt(struct task_struct *child)
clear_breakpoint(child, &child->thread.debug.bp[i]);
}
+void user_disable_single_step(struct task_struct *task)
+{
+ task->ptrace &= ~PT_SINGLESTEP;
+ ptrace_cancel_bpt(task);
+}
+
+void user_enable_single_step(struct task_struct *task)
+{
+ task->ptrace |= PT_SINGLESTEP;
+}
+
/*
* Called by kernel/ptrace.c when detaching..
*/
void ptrace_disable(struct task_struct *child)
{
- single_step_disable(child);
+ user_disable_single_step(child);
}
/*
@@ -499,10 +510,41 @@ static struct undef_hook thumb_break_hook = {
.fn = break_trap,
};
+static int thumb2_break_trap(struct pt_regs *regs, unsigned int instr)
+{
+ unsigned int instr2;
+ void __user *pc;
+
+ /* Check the second half of the instruction. */
+ pc = (void __user *)(instruction_pointer(regs) + 2);
+
+ if (processor_mode(regs) == SVC_MODE) {
+ instr2 = *(u16 *) pc;
+ } else {
+ get_user(instr2, (u16 __user *)pc);
+ }
+
+ if (instr2 == 0xa000) {
+ ptrace_break(current, regs);
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+static struct undef_hook thumb2_break_hook = {
+ .instr_mask = 0xffff,
+ .instr_val = 0xf7f0,
+ .cpsr_mask = PSR_T_BIT,
+ .cpsr_val = PSR_T_BIT,
+ .fn = thumb2_break_trap,
+};
+
static int __init ptrace_break_init(void)
{
register_undef_hook(&arm_break_hook);
register_undef_hook(&thumb_break_hook);
+ register_undef_hook(&thumb2_break_hook);
return 0;
}
@@ -669,7 +711,7 @@ static int ptrace_getvfpregs(struct task_struct *tsk, void __user *data)
union vfp_state *vfp = &thread->vfpstate;
struct user_vfp __user *ufp = data;
- vfp_sync_state(thread);
+ vfp_sync_hwstate(thread);
/* copy the floating point registers */
if (copy_to_user(&ufp->fpregs, &vfp->hard.fpregs,
@@ -692,7 +734,7 @@ static int ptrace_setvfpregs(struct task_struct *tsk, void __user *data)
union vfp_state *vfp = &thread->vfpstate;
struct user_vfp __user *ufp = data;
- vfp_sync_state(thread);
+ vfp_sync_hwstate(thread);
/* copy the floating point registers */
if (copy_from_user(&vfp->hard.fpregs, &ufp->fpregs,
@@ -703,6 +745,8 @@ static int ptrace_setvfpregs(struct task_struct *tsk, void __user *data)
if (get_user(vfp->hard.fpscr, &ufp->fpscr))
return -EFAULT;
+ vfp_flush_hwstate(thread);
+
return 0;
}
#endif
@@ -712,77 +756,14 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
int ret;
switch (request) {
- /*
- * read word at location "addr" in the child process.
- */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
case PTRACE_PEEKUSR:
ret = ptrace_read_user(child, addr, (unsigned long __user *)data);
break;
- /*
- * write the word at location addr.
- */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR:
ret = ptrace_write_user(child, addr, data);
break;
- /*
- * continue/restart and stop at next (return from) syscall
- */
- case PTRACE_SYSCALL:
- case PTRACE_CONT:
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- single_step_disable(child);
- wake_up_process(child);
- ret = 0;
- break;
-
- /*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- case PTRACE_KILL:
- single_step_disable(child);
- if (child->exit_state != EXIT_ZOMBIE) {
- child->exit_code = SIGKILL;
- wake_up_process(child);
- }
- ret = 0;
- break;
-
- /*
- * execute single instruction.
- */
- case PTRACE_SINGLESTEP:
- ret = -EIO;
- if (!valid_signal(data))
- break;
- single_step_enable(child);
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- /* give it a chance to run. */
- wake_up_process(child);
- ret = 0;
- break;
-
case PTRACE_GETREGS:
ret = ptrace_getregs(child, (void __user *)data);
break;