[POWERPC] ptrace shouldn't touch FP exec mode
One of the gratuitous difference between 32 and 64-bit ptrace is whether you can whack the MSR:FE0 and FE1 bits from ptrace. This patch forbids it unconditionally. In addition, the 64-bit kernels used to return the exception mode in the MSR on reads, but 32-bit kernels didn't. This patch makes it return those bits on both. Finally, since ptrace-ppc32.h and ptrace-ppc64.h are mostly empty now, and since the previous patch made ptrace32.c no longer need the MSR_DEBUGCHANGE definition, we just remove those 2 files and move back the remaining bits to ptrace.c (they were short lived heh ?). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
parent
912000e73e
commit
abd0650541
|
@ -1,35 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration
|
||||
* Extracted from ptrace.c and ptrace32.c
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General
|
||||
* Public License. See the file README.legal in the main directory of
|
||||
* this archive for more details.
|
||||
*/
|
||||
|
||||
#ifndef _POWERPC_PTRACE_PPC32_H
|
||||
#define _POWERPC_PTRACE_PPC32_H
|
||||
|
||||
/*
|
||||
* Set of msr bits that gdb can change on behalf of a process.
|
||||
*/
|
||||
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
|
||||
#define MSR_DEBUGCHANGE 0
|
||||
#else
|
||||
#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Max register writeable via put_reg
|
||||
*/
|
||||
#define PT_MAX_PUT_REG PT_MQ
|
||||
|
||||
/*
|
||||
* Munging of MSR on return from get_regs
|
||||
*
|
||||
* Nothing to do on ppc32
|
||||
*/
|
||||
#define PT_MUNGE_MSR(msr, task) (msr)
|
||||
|
||||
|
||||
#endif /* _POWERPC_PTRACE_PPC32_H */
|
|
@ -1,51 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2002 Stephen Rothwell, IBM Coproration
|
||||
* Extracted from ptrace.c and ptrace32.c
|
||||
*
|
||||
* This file is subject to the terms and conditions of the GNU General
|
||||
* Public License. See the file README.legal in the main directory of
|
||||
* this archive for more details.
|
||||
*/
|
||||
|
||||
#ifndef _POWERPC_PTRACE_PPC64_H
|
||||
#define _POWERPC_PTRACE_PPC64_H
|
||||
|
||||
/*
|
||||
* Set of msr bits that gdb can change on behalf of a process.
|
||||
*/
|
||||
#define MSR_DEBUGCHANGE (MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1)
|
||||
|
||||
/*
|
||||
* Max register writeable via put_reg
|
||||
*/
|
||||
#define PT_MAX_PUT_REG PT_CCR
|
||||
|
||||
/*
|
||||
* Munging of MSR on return from get_regs
|
||||
*
|
||||
* Put the correct FP bits in, they might be wrong as a result
|
||||
* of our lazy FP restore.
|
||||
*/
|
||||
|
||||
#define PT_MUNGE_MSR(msr, task) ({ (msr) | (task)->thread.fpexc_mode; })
|
||||
|
||||
static inline int ptrace_set_debugreg(struct task_struct *task,
|
||||
unsigned long addr, unsigned long data)
|
||||
{
|
||||
/* We only support one DABR and no IABRS at the moment */
|
||||
if (addr > 0)
|
||||
return -EINVAL;
|
||||
|
||||
/* The bottom 3 bits are flags */
|
||||
if ((data & ~0x7UL) >= TASK_SIZE)
|
||||
return -EIO;
|
||||
|
||||
/* Ensure translation is on */
|
||||
if (data && !(data & DABR_TRANSLATION))
|
||||
return -EIO;
|
||||
|
||||
task->thread.dabr = data;
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* _POWERPC_PTRACE_PPC64_H */
|
|
@ -35,17 +35,29 @@
|
|||
#include <asm/pgtable.h>
|
||||
#include <asm/system.h>
|
||||
|
||||
#ifdef CONFIG_PPC64
|
||||
#include "ptrace-ppc64.h"
|
||||
#else
|
||||
#include "ptrace-ppc32.h"
|
||||
#endif
|
||||
|
||||
/*
|
||||
* does not yet catch signals sent when the child dies.
|
||||
* in exit.c or in signal.c.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Set of msr bits that gdb can change on behalf of a process.
|
||||
*/
|
||||
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
|
||||
#define MSR_DEBUGCHANGE 0
|
||||
#else
|
||||
#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Max register writeable via put_reg
|
||||
*/
|
||||
#ifdef CONFIG_PPC32
|
||||
#define PT_MAX_PUT_REG PT_MQ
|
||||
#else
|
||||
#define PT_MAX_PUT_REG PT_CCR
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Get contents of register REGNO in task TASK.
|
||||
*/
|
||||
|
@ -58,7 +70,7 @@ unsigned long ptrace_get_reg(struct task_struct *task, int regno)
|
|||
|
||||
if (regno == PT_MSR) {
|
||||
tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
|
||||
return PT_MUNGE_MSR(tmp, task);
|
||||
return tmp | task->thread.fpexc_mode;
|
||||
}
|
||||
|
||||
if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
|
||||
|
@ -274,6 +286,27 @@ static void clear_single_step(struct task_struct *task)
|
|||
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PPC64
|
||||
static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
|
||||
unsigned long data)
|
||||
{
|
||||
/* We only support one DABR and no IABRS at the moment */
|
||||
if (addr > 0)
|
||||
return -EINVAL;
|
||||
|
||||
/* The bottom 3 bits are flags */
|
||||
if ((data & ~0x7UL) >= TASK_SIZE)
|
||||
return -EIO;
|
||||
|
||||
/* Ensure translation is on */
|
||||
if (data && !(data & DABR_TRANSLATION))
|
||||
return -EIO;
|
||||
|
||||
task->thread.dabr = data;
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Called by kernel/ptrace.c when detaching..
|
||||
*
|
||||
|
|
|
@ -33,8 +33,6 @@
|
|||
#include <asm/pgtable.h>
|
||||
#include <asm/system.h>
|
||||
|
||||
#include "ptrace-ppc64.h"
|
||||
|
||||
/*
|
||||
* does not yet catch signals sent when the child dies.
|
||||
* in exit.c or in signal.c.
|
||||
|
|
Loading…
Reference in a new issue