- create helper function singlestep_disable()
- move variable definitions to the top of the function
- use "out_eio" label as common error destination
- don't clear failure value for PTRACE_SETREGS/PTRACE_GETREGS
Signed-off-by: Roman Zippel <[email protected]>
---
arch/m68k/kernel/ptrace.c | 175 ++++++++++++++++------------------------------
1 files changed, 64 insertions(+), 111 deletions(-)
Index: linux-2.6/arch/m68k/kernel/ptrace.c
===================================================================
--- linux-2.6.orig/arch/m68k/kernel/ptrace.c 2005-08-30 16:19:46.290131062 +0200
+++ linux-2.6/arch/m68k/kernel/ptrace.c 2005-08-30 16:25:52.175519382 +0200
@@ -103,48 +103,56 @@ static inline int put_reg(struct task_st
}
/*
- * Called by kernel/ptrace.c when detaching..
- *
* Make sure the single step bit is not set.
*/
-void ptrace_disable(struct task_struct *child)
+static inline void singlestep_disable(struct task_struct *child)
{
- unsigned long tmp;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
+ unsigned long tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
put_reg(child, PT_SR, tmp);
child->thread.work.delayed_trace = 0;
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ singlestep_disable(child);
child->thread.work.syscall_trace = 0;
}
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
- int ret;
+ unsigned long tmp;
+ int i, ret = 0;
lock_kernel();
- ret = -EPERM;
if (request == PTRACE_TRACEME) {
/* are we already being traced? */
- if (current->ptrace & PT_PTRACED)
+ if (current->ptrace & PT_PTRACED) {
+ ret = -EPERM;
goto out;
+ }
/* set the ptrace bit in the process flags. */
current->ptrace |= PT_PTRACED;
- ret = 0;
goto out;
}
- ret = -ESRCH;
read_lock(&tasklist_lock);
child = find_task_by_pid(pid);
if (child)
get_task_struct(child);
read_unlock(&tasklist_lock);
- if (!child)
+ if (unlikely(!child)) {
+ ret = -ESRCH;
goto out;
+ }
- ret = -EPERM;
- if (pid == 1) /* you may not mess with init */
+ /* you may not mess with init */
+ if (unlikely(pid == 1)) {
+ ret = -EPERM;
goto out_tsk;
+ }
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
@@ -152,86 +160,62 @@ asmlinkage int sys_ptrace(long request,
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
- if (ret < 0)
+ if (ret)
goto out_tsk;
switch (request) {
/* when I and D space are separate, these will need to be fixed. */
case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA: {
- unsigned long tmp;
- int copied;
-
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- ret = -EIO;
- if (copied != sizeof(tmp))
- break;
+ case PTRACE_PEEKDATA:
+ i = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ if (i != sizeof(tmp))
+ goto out_eio;
ret = put_user(tmp, (unsigned long *)data);
break;
- }
/* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
+ case PTRACE_PEEKUSR:
+ if (addr & 3)
+ goto out_eio;
+ addr >>= 2; /* temporary hack. */
- tmp = 0; /* Default return condition */
- addr = addr >> 2; /* temporary hack. */
- ret = -EIO;
- if (addr < 19) {
+ if (addr >= 0 && addr < 19) {
tmp = get_reg(child, addr);
if (addr == PT_SR)
tmp >>= 16;
} else if (addr >= 21 && addr < 49) {
tmp = child->thread.fp[addr - 21];
-#ifdef CONFIG_M68KFPU_EMU
/* Convert internal fpu reg representation
* into long double format
*/
if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
tmp = ((tmp & 0xffff0000) << 15) |
((tmp & 0x0000ffff) << 16);
-#endif
} else
break;
ret = put_user(tmp, (unsigned long *)data);
break;
- }
/* when I and D space are separate, this will have to be fixed. */
case PTRACE_POKETEXT: /* write the word at location addr. */
case PTRACE_POKEDATA:
- ret = 0;
- if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
- break;
- ret = -EIO;
+ if (access_process_vm(child, addr, &data, sizeof(data), 1) != sizeof(data))
+ goto out_eio;
break;
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
-
- addr = addr >> 2; /* temporary hack. */
+ if (addr & 3)
+ goto out_eio;
+ addr >>= 2; /* temporary hack. */
if (addr == PT_SR) {
data &= SR_MASK;
data <<= 16;
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
- }
- if (addr < 19) {
+ } else if (addr >= 0 && addr < 19) {
if (put_reg(child, addr, data))
- break;
- ret = 0;
- break;
- }
- if (addr >= 21 && addr < 48) {
-#ifdef CONFIG_M68KFPU_EMU
+ goto out_eio;
+ } else if (addr >= 21 && addr < 48) {
/* Convert long double format
* into internal fpu reg representation
*/
@@ -240,60 +224,42 @@ asmlinkage int sys_ptrace(long request,
data = (data & 0xffff0000) |
((data & 0x0000ffff) >> 1);
}
-#endif
child->thread.fp[addr - 21] = data;
- ret = 0;
- }
+ } else
+ goto out_eio;
break;
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: { /* restart after signal. */
- long tmp;
-
- ret = -EIO;
+ case PTRACE_CONT: /* restart after signal. */
if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL) {
+ goto out_eio;
+
+ if (request == PTRACE_SYSCALL)
child->thread.work.syscall_trace = ~0;
- } else {
+ else
child->thread.work.syscall_trace = 0;
- }
child->exit_code = data;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 0;
+ singlestep_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: {
- long tmp;
-
- ret = 0;
+ case PTRACE_KILL:
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
child->exit_code = SIGKILL;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 0;
+ singlestep_disable(child);
wake_up_process(child);
break;
- }
-
- case PTRACE_SINGLESTEP: { /* set the trap flag. */
- long tmp;
- ret = -EIO;
+ case PTRACE_SINGLESTEP: /* set the trap flag. */
if (!valid_signal(data))
- break;
+ goto out_eio;
+
child->thread.work.syscall_trace = 0;
tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
put_reg(child, PT_SR, tmp);
@@ -302,39 +268,29 @@ asmlinkage int sys_ptrace(long request,
child->exit_code = data;
/* give it a chance to run. */
wake_up_process(child);
- ret = 0;
break;
- }
case PTRACE_DETACH: /* detach a process that was attached. */
ret = ptrace_detach(child, data);
break;
- case PTRACE_GETREGS: { /* Get all gp regs from the child. */
- int i;
- unsigned long tmp;
+ case PTRACE_GETREGS: /* Get all gp regs from the child. */
for (i = 0; i < 19; i++) {
tmp = get_reg(child, i);
if (i == PT_SR)
tmp >>= 16;
- if (put_user(tmp, (unsigned long *)data)) {
- ret = -EFAULT;
+ ret = put_user(tmp, (unsigned long *)data);
+ if (ret)
break;
- }
data += sizeof(long);
}
- ret = 0;
break;
- }
- case PTRACE_SETREGS: { /* Set all gp regs in the child. */
- int i;
- unsigned long tmp;
+ case PTRACE_SETREGS: /* Set all gp regs in the child. */
for (i = 0; i < 19; i++) {
- if (get_user(tmp, (unsigned long *)data)) {
- ret = -EFAULT;
+ ret = get_user(tmp, (unsigned long *)data);
+ if (ret)
break;
- }
if (i == PT_SR) {
tmp &= SR_MASK;
tmp <<= 16;
@@ -343,25 +299,19 @@ asmlinkage int sys_ptrace(long request,
put_reg(child, i, tmp);
data += sizeof(long);
}
- ret = 0;
break;
- }
- case PTRACE_GETFPREGS: { /* Get the child FPU state. */
- ret = 0;
+ case PTRACE_GETFPREGS: /* Get the child FPU state. */
if (copy_to_user((void *)data, &child->thread.fp,
sizeof(struct user_m68kfp_struct)))
ret = -EFAULT;
break;
- }
- case PTRACE_SETFPREGS: { /* Set the child FPU state. */
- ret = 0;
+ case PTRACE_SETFPREGS: /* Set the child FPU state. */
if (copy_from_user(&child->thread.fp, (void *)data,
sizeof(struct user_m68kfp_struct)))
ret = -EFAULT;
break;
- }
default:
ret = ptrace_request(child, request, addr, data);
@@ -372,6 +322,9 @@ out_tsk:
out:
unlock_kernel();
return ret;
+out_eio:
+ ret = -EIO;
+ goto out_tsk;
}
asmlinkage void syscall_trace(void)
-
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