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authorJiri Kosina <jkosina@suse.cz>2011-04-26 10:22:15 +0200
committerJiri Kosina <jkosina@suse.cz>2011-04-26 10:22:59 +0200
commit07f9479a40cc778bc1462ada11f95b01360ae4ff (patch)
tree0676cf38df3844004bb3ebfd99dfa67a4a8998f5 /arch/m68k/kernel/ptrace_no.c
parent9d5e6bdb3013acfb311ab407eeca0b6a6a3dedbf (diff)
parentcd2e49e90f1cae7726c9a2c54488d881d7f1cd1c (diff)
downloadlinux-07f9479a40cc778bc1462ada11f95b01360ae4ff.tar.gz
Merge branch 'master' into for-next
Fast-forwarded to current state of Linus' tree as there are patches to be applied for files that didn't exist on the old branch.
Diffstat (limited to 'arch/m68k/kernel/ptrace_no.c')
-rw-r--r--arch/m68k/kernel/ptrace_no.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/m68k/kernel/ptrace_no.c b/arch/m68k/kernel/ptrace_no.c
new file mode 100644
index 00000000000..6709fb70733
--- /dev/null
+++ b/arch/m68k/kernel/ptrace_no.c
@@ -0,0 +1,255 @@
+/*
+ * linux/arch/m68knommu/kernel/ptrace.c
+ *
+ * Copyright (C) 1994 by Hamish Macdonald
+ * Taken from linux/kernel/ptrace.c and modified for M680x0.
+ * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of
+ * this archive for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/signal.h>
+#include <linux/tracehook.h>
+
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/* determines which bits in the SR the user has access to. */
+/* 1 = access 0 = no access */
+#define SR_MASK 0x001f
+
+/* sets the trace bits. */
+#define TRACE_BITS 0x8000
+
+/* Find the stack offset for a register, relative to thread.esp0. */
+#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
+#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
+ - sizeof(struct switch_stack))
+/* Mapping from PT_xxx to the stack offset at which the register is
+ saved. Notice that usp has no stack-slot and needs to be treated
+ specially (see get_reg/put_reg below). */
+static int regoff[] = {
+ PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
+ PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
+ PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
+ SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
+ PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
+};
+
+/*
+ * Get contents of register REGNO in task TASK.
+ */
+static inline long get_reg(struct task_struct *task, int regno)
+{
+ unsigned long *addr;
+
+ if (regno == PT_USP)
+ addr = &task->thread.usp;
+ else if (regno < ARRAY_SIZE(regoff))
+ addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
+ else
+ return 0;
+ return *addr;
+}
+
+/*
+ * Write contents of register REGNO in task TASK.
+ */
+static inline int put_reg(struct task_struct *task, int regno,
+ unsigned long data)
+{
+ unsigned long *addr;
+
+ if (regno == PT_USP)
+ addr = &task->thread.usp;
+ else if (regno < ARRAY_SIZE(regoff))
+ addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
+ else
+ return -1;
+ *addr = data;
+ return 0;
+}
+
+void user_enable_single_step(struct task_struct *task)
+{
+ unsigned long srflags;
+ srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);
+ put_reg(task, PT_SR, srflags);
+}
+
+void user_disable_single_step(struct task_struct *task)
+{
+ unsigned long srflags;
+ srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);
+ put_reg(task, PT_SR, srflags);
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure the single step bit is not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ /* make sure the single step bit is not set. */
+ user_disable_single_step(child);
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ int ret;
+ int regno = addr >> 2;
+ unsigned long __user *datap = (unsigned long __user *) data;
+
+ switch (request) {
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ unsigned long tmp;
+
+ ret = -EIO;
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
+ break;
+
+ tmp = 0; /* Default return condition */
+ ret = -EIO;
+ if (regno < 19) {
+ tmp = get_reg(child, regno);
+ if (regno == PT_SR)
+ tmp >>= 16;
+ } else if (regno >= 21 && regno < 49) {
+ tmp = child->thread.fp[regno - 21];
+ } else if (regno == 49) {
+ tmp = child->mm->start_code;
+ } else if (regno == 50) {
+ tmp = child->mm->start_data;
+ } else if (regno == 51) {
+ tmp = child->mm->end_code;
+ } else
+ break;
+ ret = put_user(tmp, datap);
+ break;
+ }
+
+ case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
+ ret = -EIO;
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
+ break;
+
+ if (regno == PT_SR) {
+ data &= SR_MASK;
+ data <<= 16;
+ data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
+ }
+ if (regno < 19) {
+ if (put_reg(child, regno, data))
+ break;
+ ret = 0;
+ break;
+ }
+ if (regno >= 21 && regno < 48)
+ {
+ child->thread.fp[regno - 21] = data;
+ ret = 0;
+ }
+ break;
+
+ case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+ int i;
+ unsigned long tmp;
+ for (i = 0; i < 19; i++) {
+ tmp = get_reg(child, i);
+ if (i == PT_SR)
+ tmp >>= 16;
+ if (put_user(tmp, datap)) {
+ ret = -EFAULT;
+ break;
+ }
+ datap++;
+ }
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+ int i;
+ unsigned long tmp;
+ for (i = 0; i < 19; i++) {
+ if (get_user(tmp, datap)) {
+ ret = -EFAULT;
+ break;
+ }
+ if (i == PT_SR) {
+ tmp &= SR_MASK;
+ tmp <<= 16;
+ tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
+ }
+ put_reg(child, i, tmp);
+ datap++;
+ }
+ ret = 0;
+ break;
+ }
+
+#ifdef PTRACE_GETFPREGS
+ case PTRACE_GETFPREGS: { /* Get the child FPU state. */
+ ret = 0;
+ if (copy_to_user(datap, &child->thread.fp,
+ sizeof(struct user_m68kfp_struct)))
+ ret = -EFAULT;
+ break;
+ }
+#endif
+
+#ifdef PTRACE_SETFPREGS
+ case PTRACE_SETFPREGS: { /* Set the child FPU state. */
+ ret = 0;
+ if (copy_from_user(&child->thread.fp, datap,
+ sizeof(struct user_m68kfp_struct)))
+ ret = -EFAULT;
+ break;
+ }
+#endif
+
+ case PTRACE_GET_THREAD_AREA:
+ ret = put_user(task_thread_info(child)->tp_value, datap);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+ return ret;
+}
+
+asmlinkage int syscall_trace_enter(void)
+{
+ int ret = 0;
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ret = tracehook_report_syscall_entry(task_pt_regs(current));
+ return ret;
+}
+
+asmlinkage void syscall_trace_leave(void)
+{
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(task_pt_regs(current), 0);
+}