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-rw-r--r--arch/mn10300/kernel/ptrace.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/ptrace.c b/arch/mn10300/kernel/ptrace.c
new file mode 100644
index 000000000000..d6d6cdc75c52
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+++ b/arch/mn10300/kernel/ptrace.c
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+/* MN10300 Process tracing
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Modified by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/fpu.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * translate ptrace register IDs into struct pt_regs offsets
+ */
+static const u8 ptrace_regid_to_frame[] = {
+ [PT_A3 << 2] = REG_A3,
+ [PT_A2 << 2] = REG_A2,
+ [PT_D3 << 2] = REG_D3,
+ [PT_D2 << 2] = REG_D2,
+ [PT_MCVF << 2] = REG_MCVF,
+ [PT_MCRL << 2] = REG_MCRL,
+ [PT_MCRH << 2] = REG_MCRH,
+ [PT_MDRQ << 2] = REG_MDRQ,
+ [PT_E1 << 2] = REG_E1,
+ [PT_E0 << 2] = REG_E0,
+ [PT_E7 << 2] = REG_E7,
+ [PT_E6 << 2] = REG_E6,
+ [PT_E5 << 2] = REG_E5,
+ [PT_E4 << 2] = REG_E4,
+ [PT_E3 << 2] = REG_E3,
+ [PT_E2 << 2] = REG_E2,
+ [PT_SP << 2] = REG_SP,
+ [PT_LAR << 2] = REG_LAR,
+ [PT_LIR << 2] = REG_LIR,
+ [PT_MDR << 2] = REG_MDR,
+ [PT_A1 << 2] = REG_A1,
+ [PT_A0 << 2] = REG_A0,
+ [PT_D1 << 2] = REG_D1,
+ [PT_D0 << 2] = REG_D0,
+ [PT_ORIG_D0 << 2] = REG_ORIG_D0,
+ [PT_EPSW << 2] = REG_EPSW,
+ [PT_PC << 2] = REG_PC,
+};
+
+static inline int get_stack_long(struct task_struct *task, int offset)
+{
+ return *(unsigned long *)
+ ((unsigned long) task->thread.uregs + offset);
+}
+
+/*
+ * 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
+int put_stack_long(struct task_struct *task, int offset, unsigned long data)
+{
+ unsigned long stack;
+
+ stack = (unsigned long) task->thread.uregs + offset;
+ *(unsigned long *) stack = data;
+ return 0;
+}
+
+static inline unsigned long get_fpregs(struct fpu_state_struct *buf,
+ struct task_struct *tsk)
+{
+ return __copy_to_user(buf, &tsk->thread.fpu_state,
+ sizeof(struct fpu_state_struct));
+}
+
+static inline unsigned long set_fpregs(struct task_struct *tsk,
+ struct fpu_state_struct *buf)
+{
+ return __copy_from_user(&tsk->thread.fpu_state, buf,
+ sizeof(struct fpu_state_struct));
+}
+
+static inline void fpsave_init(struct task_struct *task)
+{
+ memset(&task->thread.fpu_state, 0, sizeof(struct fpu_state_struct));
+}
+
+/*
+ * make sure the single step bit is not set
+ */
+void ptrace_disable(struct task_struct *child)
+{
+#ifndef CONFIG_MN10300_USING_JTAG
+ struct user *dummy = NULL;
+ long tmp;
+
+ tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
+ tmp &= ~EPSW_T;
+ put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
+#endif
+}
+
+/*
+ * set the single step bit
+ */
+void ptrace_enable(struct task_struct *child)
+{
+#ifndef CONFIG_MN10300_USING_JTAG
+ struct user *dummy = NULL;
+ long tmp;
+
+ tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
+ tmp |= EPSW_T;
+ put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
+#endif
+}
+
+/*
+ * handle the arch-specific side of process tracing
+ */
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+ struct fpu_state_struct fpu_state;
+ int i, ret;
+
+ switch (request) {
+ /* read the word at location addr. */
+ case PTRACE_PEEKTEXT: {
+ unsigned long tmp;
+ int copied;
+
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ ret = -EIO;
+ if (copied != sizeof(tmp))
+ break;
+ ret = put_user(tmp, (unsigned long *) data);
+ break;
+ }
+
+ /* read the word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp;
+ int copied;
+
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ ret = -EIO;
+ if (copied != sizeof(tmp))
+ break;
+ ret = put_user(tmp, (unsigned long *) data);
+ break;
+ }
+
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ unsigned long tmp;
+
+ ret = -EIO;
+ if ((addr & 3) || addr < 0 ||
+ addr > sizeof(struct user) - 3)
+ break;
+
+ tmp = 0; /* Default return condition */
+ if (addr < NR_PTREGS << 2)
+ tmp = get_stack_long(child,
+ ptrace_regid_to_frame[addr]);
+ ret = put_user(tmp, (unsigned long *) data);
+ break;
+ }
+
+ /* write the word at location addr. */
+ case PTRACE_POKETEXT:
+ case PTRACE_POKEDATA:
+ if (access_process_vm(child, addr, &data, sizeof(data), 1) ==
+ sizeof(data))
+ ret = 0;
+ else
+ ret = -EIO;
+ break;
+
+ /* write the word at location addr in the USER area */
+ case PTRACE_POKEUSR:
+ ret = -EIO;
+ if ((addr & 3) || addr < 0 ||
+ addr > sizeof(struct user) - 3)
+ break;
+
+ ret = 0;
+ if (addr < NR_PTREGS << 2)
+ ret = put_stack_long(child, ptrace_regid_to_frame[addr],
+ data);
+ break;
+
+ /* continue and stop at next (return from) syscall */
+ case PTRACE_SYSCALL:
+ /* restart after signal. */
+ case PTRACE_CONT:
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ if (request == PTRACE_SYSCALL)
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->exit_code = data;
+ ptrace_disable(child);
+ wake_up_process(child);
+ ret = 0;
+ break;
+
+ /*
+ * make the child exit
+ * - the best I can do is send it a sigkill
+ * - perhaps it should be put in the status that it wants to
+ * exit
+ */
+ case PTRACE_KILL:
+ ret = 0;
+ if (child->exit_state == EXIT_ZOMBIE) /* already dead */
+ break;
+ child->exit_code = SIGKILL;
+ clear_tsk_thread_flag(child, TIF_SINGLESTEP);
+ ptrace_disable(child);
+ wake_up_process(child);
+ break;
+
+ case PTRACE_SINGLESTEP: /* set the trap flag. */
+#ifndef CONFIG_MN10300_USING_JTAG
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ ptrace_enable(child);
+ child->exit_code = data;
+ wake_up_process(child);
+ ret = 0;
+#else
+ ret = -EINVAL;
+#endif
+ break;
+
+ case PTRACE_DETACH: /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
+
+ /* Get all gp regs from the child. */
+ case PTRACE_GETREGS: {
+ unsigned long tmp;
+
+ if (!access_ok(VERIFY_WRITE, (unsigned *) data, NR_PTREGS << 2)) {
+ ret = -EIO;
+ break;
+ }
+
+ for (i = 0; i < NR_PTREGS << 2; i += 4) {
+ tmp = get_stack_long(child, ptrace_regid_to_frame[i]);
+ __put_user(tmp, (unsigned long *) data);
+ data += sizeof(tmp);
+ }
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+ unsigned long tmp;
+
+ if (!access_ok(VERIFY_READ, (unsigned long *)data,
+ sizeof(struct pt_regs))) {
+ ret = -EIO;
+ break;
+ }
+
+ for (i = 0; i < NR_PTREGS << 2; i += 4) {
+ __get_user(tmp, (unsigned long *) data);
+ put_stack_long(child, ptrace_regid_to_frame[i], tmp);
+ data += sizeof(tmp);
+ }
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_GETFPREGS: { /* Get the child FPU state. */
+ if (is_using_fpu(child)) {
+ unlazy_fpu(child);
+ fpu_state = child->thread.fpu_state;
+ } else {
+ memset(&fpu_state, 0, sizeof(fpu_state));
+ }
+
+ ret = -EIO;
+ if (copy_to_user((void *) data, &fpu_state,
+ sizeof(fpu_state)) == 0)
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_SETFPREGS: { /* Set the child FPU state. */
+ ret = -EFAULT;
+ if (copy_from_user(&fpu_state, (const void *) data,
+ sizeof(fpu_state)) == 0) {
+ fpu_kill_state(child);
+ child->thread.fpu_state = fpu_state;
+ set_using_fpu(child);
+ ret = 0;
+ }
+ break;
+ }
+
+ case PTRACE_SETOPTIONS: {
+ if (data & PTRACE_O_TRACESYSGOOD)
+ child->ptrace |= PT_TRACESYSGOOD;
+ else
+ child->ptrace &= ~PT_TRACESYSGOOD;
+ ret = 0;
+ break;
+ }
+
+ default:
+ ret = -EIO;
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * notification of system call entry/exit
+ * - triggered by current->work.syscall_trace
+ */
+asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
+{
+#if 0
+ /* just in case... */
+ printk(KERN_DEBUG "[%d] syscall_%lu(%lx,%lx,%lx,%lx) = %lx\n",
+ current->pid,
+ regs->orig_d0,
+ regs->a0,
+ regs->d1,
+ regs->a3,
+ regs->a2,
+ regs->d0);
+ return;
+#endif
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
+ !test_thread_flag(TIF_SINGLESTEP))
+ return;
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+
+ /* the 0x80 provides a way for the tracing parent to distinguish
+ between a syscall stop and SIGTRAP delivery */
+ ptrace_notify(SIGTRAP |
+ ((current->ptrace & PT_TRACESYSGOOD) &&
+ !test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
+
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
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