h8300: use generic ptrace_resume code

Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT,
PTRACE_KILL and PTRACE_SINGLESTEP.  This implies defining
arch_has_single_step in <asm/ptrace.h> and implementing the
user_enable_single_step and user_disable_single_step functions, which also
causes the breakpoint information to be cleared on fork, which could be
considered a bug fix.

Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL which
it previously wasn't which is consistent with all architectures using the
modern ptrace code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/h8300/include/asm/ptrace.h b/arch/h8300/include/asm/ptrace.h
index c2e05e4..d866c0e 100644 (file)
--- a/arch/h8300/include/asm/ptrace.h
+++ b/arch/h8300/include/asm/ptrace.h
@@ -55,6 +55,8 @@ struct pt_regs {
 /* Find the stack offset for a register, relative to thread.esp0. */
 #define PT_REG(reg)    ((long)&((struct pt_regs *)0)->reg)
 
+#define arch_has_single_step() (1)
+
 #define user_mode(regs) (!((regs)->ccr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
 #define profile_pc(regs) instruction_pointer(regs)

diff --git a/arch/h8300/kernel/ptrace.c b/arch/h8300/kernel/ptrace.c
index 04bb9dd..df11412 100644 (file)
--- a/arch/h8300/kernel/ptrace.c
+++ b/arch/h8300/kernel/ptrace.c
@@ -34,8 +34,11 @@
 /* cpu depend functions */
 extern long h8300_get_reg(struct task_struct *task, int regno);
 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
-extern void h8300_disable_trace(struct task_struct *child);
-extern void h8300_enable_trace(struct task_struct *child);
+
+
+void user_disable_single_step(struct task_struct *child)
+{
+}
 
 /*
  * does not yet catch signals sent when the child dies.
@@ -44,7 +47,7 @@ extern void h8300_enable_trace(struct task_struct *child);
 
 void ptrace_disable(struct task_struct *child)
 {
-       h8300_disable_trace(child);
+       user_disable_single_step(child);
 }
 
 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
@@ -107,49 +110,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                        }
                        ret = -EIO;
                        break ;
-               case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
-               case PTRACE_CONT: { /* restart after signal. */
-                       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;
-                       wake_up_process(child);
-                       /* make sure the single step bit is not set. */
-                       h8300_disable_trace(child);
-                       ret = 0;
-               }
-
-/*
- * 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: {
-
-                       ret = 0;
-                       if (child->exit_state == EXIT_ZOMBIE) /* already dead */
-                               break;
-                       child->exit_code = SIGKILL;
-                       h8300_disable_trace(child);
-                       wake_up_process(child);
-                       break;
-               }
-
-               case PTRACE_SINGLESTEP: {  /* set the trap flag. */
-                       ret = -EIO;
-                       if (!valid_signal(data))
-                               break;
-                       clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-                       child->exit_code = data;
-                       h8300_enable_trace(child);
-                       wake_up_process(child);
-                       ret = 0;
-                       break;
-               }
 
                case PTRACE_GETREGS: { /* Get all gp regs from the child. */
                        int i;

diff --git a/arch/h8300/platform/h8300h/ptrace_h8300h.c b/arch/h8300/platform/h8300h/ptrace_h8300h.c
index 746b1ae..4f1ed02 100644 (file)
--- a/arch/h8300/platform/h8300h/ptrace_h8300h.c
+++ b/arch/h8300/platform/h8300h/ptrace_h8300h.c
@@ -60,7 +60,7 @@ int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
 }
 
 /* disable singlestep */
-void h8300_disable_trace(struct task_struct *child)
+void user_disable_single_step(struct task_struct *child)
 {
        if((long)child->thread.breakinfo.addr != -1L) {
                *child->thread.breakinfo.addr = child->thread.breakinfo.inst;
@@ -264,7 +264,7 @@ static unsigned short *getnextpc(struct task_struct *child, unsigned short *pc)
 
 /* Set breakpoint(s) to simulate a single step from the current PC.  */
 
-void h8300_enable_trace(struct task_struct *child)
+void user_enable_single_step(struct task_struct *child)
 {
        unsigned short *nextpc;
        nextpc = getnextpc(child,(unsigned short *)h8300_get_reg(child, PT_PC));
@@ -276,7 +276,7 @@ void h8300_enable_trace(struct task_struct *child)
 asmlinkage void trace_trap(unsigned long bp)
 {
        if ((unsigned long)current->thread.breakinfo.addr == bp) {
-               h8300_disable_trace(current);
+               user_disable_single_step(current);
                force_sig(SIGTRAP,current);
        } else
                force_sig(SIGILL,current);

diff --git a/arch/h8300/platform/h8s/ptrace_h8s.c b/arch/h8300/platform/h8s/ptrace_h8s.c
index e8cd46f..c058ab1 100644 (file)
--- a/arch/h8300/platform/h8s/ptrace_h8s.c
+++ b/arch/h8300/platform/h8s/ptrace_h8s.c
@@ -65,13 +65,13 @@ int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
 }
 
 /* disable singlestep */
-void h8300_disable_trace(struct task_struct *child)
+void user_disable_single_step(struct task_struct *child)
 {
        *(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) &= ~EXR_TRACE;
 }
 
 /* enable singlestep */
-void h8300_enable_trace(struct task_struct *child)
+void user_enable_single_step(struct task_struct *child)
 {
        *(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) |= EXR_TRACE;
 }