[POWERPC] ptrace accessors for special regs MSR and TRAP
This isolates the ptrace code for the special-case registers msr and trap from the ptrace-layout dispatch code. This should inline away completely. It cleanly separates the low-level machine magic that has to be done for deep reasons, from the superficial details of the ptrace interface. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -60,20 +60,38 @@
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#define PT_MAX_PUT_REG PT_CCR
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#endif
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static unsigned long get_user_msr(struct task_struct *task)
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{
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return task->thread.regs->msr | task->thread.fpexc_mode;
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}
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static int set_user_msr(struct task_struct *task, unsigned long msr)
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{
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task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
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task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
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return 0;
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}
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/*
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* We prevent mucking around with the reserved area of trap
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* which are used internally by the kernel.
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*/
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static int set_user_trap(struct task_struct *task, unsigned long trap)
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{
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task->thread.regs->trap = trap & 0xfff0;
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return 0;
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}
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/*
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* Get contents of register REGNO in task TASK.
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*/
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unsigned long ptrace_get_reg(struct task_struct *task, int regno)
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{
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unsigned long tmp = 0;
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if (task->thread.regs == NULL)
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return -EIO;
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if (regno == PT_MSR) {
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tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
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return tmp | task->thread.fpexc_mode;
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}
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if (regno == PT_MSR)
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return get_user_msr(task);
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if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
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return ((unsigned long *)task->thread.regs)[regno];
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@ -89,15 +107,12 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
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if (task->thread.regs == NULL)
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return -EIO;
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if (regno <= PT_MAX_PUT_REG || regno == PT_TRAP) {
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if (regno == PT_MSR)
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data = (data & MSR_DEBUGCHANGE)
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| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
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/* We prevent mucking around with the reserved area of trap
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* which are used internally by the kernel
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*/
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if (regno == PT_TRAP)
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data &= 0xfff0;
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if (regno == PT_MSR)
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return set_user_msr(task, data);
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if (regno == PT_TRAP)
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return set_user_trap(task, data);
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if (regno <= PT_MAX_PUT_REG) {
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((unsigned long *)task->thread.regs)[regno] = data;
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return 0;
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}
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