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x86-64 ptrace: use task_pt_regs 

This cleans up the 64-bit ptrace code to use task_pt_regs instead of its
own redundant code that does the same thing a different way.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:52 +01:00 committed by Ingo Molnar
parent 62a97d447b
commit e4aed6cc45
1 changed files with 12 additions and 48 deletions
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60
arch/x86/kernel/ptrace_64.c
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@ -42,44 +42,6 @@
*/
#define FLAG_MASK 0x54dd5UL
/*
* eflags and offset of eflags on child stack..
*/
#define EFLAGS offsetof(struct pt_regs, eflags)
#define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs)))
/*
* this routine will get a word off of the processes privileged stack.
* the offset is how far from the base addr as stored in the TSS.
* this routine assumes that all the privileged stacks are in our
* data space.
*/
static inline unsigned long get_stack_long(struct task_struct *task, int offset)
{
unsigned char *stack;
stack = (unsigned char *)task->thread.rsp0;
stack += offset;
return (*((unsigned long *)stack));
}
/*
* this routine will put a word on the processes privileged stack.
* the offset is how far from the base addr as stored in the TSS.
* this routine assumes that all the privileged stacks are in our
* data space.
*/
static inline long put_stack_long(struct task_struct *task, int offset,
unsigned long data)
{
unsigned char * stack;
stack = (unsigned char *) task->thread.rsp0;
stack += offset;
*(unsigned long *) stack = data;
return 0;
}
/*
* Called by kernel/ptrace.c when detaching..
*
@ -90,11 +52,16 @@ void ptrace_disable(struct task_struct *child)
user_disable_single_step(child);
}
static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
{
BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
return &regs->r15 + (offset / sizeof(regs->r15));
}
static int putreg(struct task_struct *child,
unsigned long regno, unsigned long value)
{
unsigned long tmp;
struct pt_regs *regs = task_pt_regs(child);
switch (regno) {
case offsetof(struct user_regs_struct,fs):
if (value && (value & 3) != 3)
@ -152,9 +119,7 @@ static int putreg(struct task_struct *child,
clear_tsk_thread_flag(child, TIF_FORCED_TF);
else if (test_tsk_thread_flag(child, TIF_FORCED_TF))
value |= X86_EFLAGS_TF;
tmp = get_stack_long(child, EFL_OFFSET);
tmp &= ~FLAG_MASK;
value |= tmp;
value |= regs->eflags & ~FLAG_MASK;
break;
case offsetof(struct user_regs_struct,cs):
if ((value & 3) != 3)
@ -162,12 +127,13 @@ static int putreg(struct task_struct *child,
value &= 0xffff;
break;
}
put_stack_long(child, regno - sizeof(struct pt_regs), value);
*pt_regs_access(regs, regno) = value;
return 0;
}
static unsigned long getreg(struct task_struct *child, unsigned long regno)
{
struct pt_regs *regs = task_pt_regs(child);
unsigned long val;
switch (regno) {
case offsetof(struct user_regs_struct, fs):
@ -202,16 +168,14 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno)
/*
* If the debugger set TF, hide it from the readout.
*/
regno = regno - sizeof(struct pt_regs);
val = get_stack_long(child, regno);
val = regs->eflags;
if (test_tsk_thread_flag(child, TIF_IA32))
val &= 0xffffffff;
if (test_tsk_thread_flag(child, TIF_FORCED_TF))
val &= ~X86_EFLAGS_TF;
return val;
default:
regno = regno - sizeof(struct pt_regs);
val = get_stack_long(child, regno);
val = *pt_regs_access(regs, regno);
if (test_tsk_thread_flag(child, TIF_IA32))
val &= 0xffffffff;
return val;