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powerpc: fixing ptrace_get_reg to return an error

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Currently ptrace_get_reg returns error as a value
what make impossible to tell whether it is a correct value or error code.

The patch adds a parameter which points to the real return data and
returns an error code.

As get_user_msr() never fails and it is used in multiple places so it has not
been changed by this patch.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2013-02-14 17:44:23 +00:00 committed by Michael Ellerman
parent 3cc33d50f5
commit ee4a391661
3 changed files with 32 additions and 15 deletions
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3
arch/powerpc/include/asm/ptrace.h
View File

@ -92,7 +92,8 @@ static inline long regs_return_value(struct pt_regs *regs)
} while(0)
struct task_struct;
extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
extern int ptrace_get_reg(struct task_struct *task, int regno,
unsigned long *data);
extern int ptrace_put_reg(struct task_struct *task, int regno,
unsigned long data);

29
arch/powerpc/kernel/ptrace.c
View File

@ -180,9 +180,10 @@ static int set_user_msr(struct task_struct *task, unsigned long msr)
}
#ifdef CONFIG_PPC64
static unsigned long get_user_dscr(struct task_struct *task)
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
return task->thread.dscr;
*data = task->thread.dscr;
return 0;
}
static int set_user_dscr(struct task_struct *task, unsigned long dscr)
@ -192,7 +193,7 @@ static int set_user_dscr(struct task_struct *task, unsigned long dscr)
return 0;
}
#else
static unsigned long get_user_dscr(struct task_struct *task)
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
return -EIO;
}
@ -216,19 +217,23 @@ static int set_user_trap(struct task_struct *task, unsigned long trap)
/*
* Get contents of register REGNO in task TASK.
*/
unsigned long ptrace_get_reg(struct task_struct *task, int regno)
int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
{
if (task->thread.regs == NULL)
if ((task->thread.regs == NULL) || !data)
return -EIO;
if (regno == PT_MSR)
return get_user_msr(task);
if (regno == PT_MSR) {
*data = get_user_msr(task);
return 0;
}
if (regno == PT_DSCR)
return get_user_dscr(task);
return get_user_dscr(task, data);
if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
return ((unsigned long *)task->thread.regs)[regno];
if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) {
*data = ((unsigned long *)task->thread.regs)[regno];
return 0;
}
return -EIO;
}
@ -1560,7 +1565,9 @@ long arch_ptrace(struct task_struct *child, long request,
CHECK_FULL_REGS(child->thread.regs);
if (index < PT_FPR0) {
tmp = ptrace_get_reg(child, (int) index);
ret = ptrace_get_reg(child, (int) index, &tmp);
if (ret)
break;
} else {
unsigned int fpidx = index - PT_FPR0;

15
arch/powerpc/kernel/ptrace32.c
View File

@ -95,7 +95,9 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
CHECK_FULL_REGS(child->thread.regs);
if (index < PT_FPR0) {
tmp = ptrace_get_reg(child, index);
ret = ptrace_get_reg(child, index, &tmp);
if (ret)
break;
} else {
flush_fp_to_thread(child);
/*
@ -148,7 +150,11 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
tmp = ((u64 *)child->thread.fpr)
[FPRINDEX_3264(numReg)];
} else { /* register within PT_REGS struct */
tmp = ptrace_get_reg(child, numReg);
unsigned long tmp2;
ret = ptrace_get_reg(child, numReg, &tmp2);
if (ret)
break;
tmp = tmp2;
}
reg32bits = ((u32*)&tmp)[part];
ret = put_user(reg32bits, (u32 __user *)data);
@ -232,7 +238,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;
CHECK_FULL_REGS(child->thread.regs);
if (numReg < PT_FPR0) {
unsigned long freg = ptrace_get_reg(child, numReg);
unsigned long freg;
ret = ptrace_get_reg(child, numReg, &freg);
if (ret)
break;
if (index % 2)
freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
else