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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-04 15:15:47 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-14 22:29:57 +1000
commitabd0650541604d6c028bcbf5002e4a68aaf56e90 (patch)
treea915cecfa86f34ea8a2661d311548da009379c21 /arch/powerpc
parent912000e73ee8fcb97831b123c9c3a7274b71cab7 (diff)
[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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/ptrace-ppc32.h35
-rw-r--r--arch/powerpc/kernel/ptrace-ppc64.h51
-rw-r--r--arch/powerpc/kernel/ptrace.c45
-rw-r--r--arch/powerpc/kernel/ptrace32.c2
4 files changed, 39 insertions, 94 deletions
diff --git a/arch/powerpc/kernel/ptrace-ppc32.h b/arch/powerpc/kernel/ptrace-ppc32.h
deleted file mode 100644
index f1fd5b8a868..00000000000
--- a/arch/powerpc/kernel/ptrace-ppc32.h
+++ /dev/null
@@ -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 */
diff --git a/arch/powerpc/kernel/ptrace-ppc64.h b/arch/powerpc/kernel/ptrace-ppc64.h
deleted file mode 100644
index e450ce01392..00000000000
--- a/arch/powerpc/kernel/ptrace-ppc64.h
+++ /dev/null
@@ -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 */
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index dd4837c4a68..75bc744a621 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -35,16 +35,28 @@
#include <asm/pgtable.h>
#include <asm/system.h>
-#ifdef CONFIG_PPC64
-#include "ptrace-ppc64.h"
+/*
+ * 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
-#include "ptrace-ppc32.h"
+#define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
#endif
/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
+ * 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..
*
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
index aae6a988e18..9e6baeac0fb 100644
--- a/arch/powerpc/kernel/ptrace32.c
+++ b/arch/powerpc/kernel/ptrace32.c
@@ -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.