1 files changed, 275 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/ptrace.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/ptrace.c
new file mode 100644
index 000000000..18bb39e9d
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/ptrace.c
@@ -0,0 +1,275 @@
+/*
+ * arch/ubicom32/kernel/ptrace.c
+ *   Ubicom32 architecture ptrace implementation.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ * (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 part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ *   arch/m68knommu
+ *   arch/blackfin
+ *   arch/parisc
+ */
+
+#include <linux/module.h>
+#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/uaccess.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+
+/*
+ * ptrace_getregs()
+ *
+ *	Get all user integer registers.
+ */
+static inline int ptrace_getregs(struct task_struct *task, void __user *uregs)
+{
+	struct pt_regs *regs = task_pt_regs(task);
+	return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
+}
+
+/*
+ * ptrace_get_reg()
+ *
+ *	Get contents of register REGNO in task TASK.
+ */
+static unsigned long ptrace_get_reg(struct task_struct *task, int regno)
+{
+	if (regno < sizeof(struct pt_regs)) {
+		struct pt_regs *pt_regs = task_pt_regs(task);
+		return *(unsigned long *)((long) pt_regs + regno);
+	}
+
+	return -EIO;
+}
+
+/*
+ * ptrace_put_reg()
+ *	Write contents of register REGNO in task TASK.
+ */
+static int ptrace_put_reg(struct task_struct *task, int regno,
+			  unsigned long data)
+{
+	if (regno <= sizeof(struct pt_regs) && regno != PT_FRAME_TYPE) {
+		struct pt_regs *pt_regs = task_pt_regs(task);
+		*(unsigned long *)((long) pt_regs + regno) = data;
+		return 0;
+	}
+	return -EIO;
+}
+
+/*
+ * ptrace_disable_single_step()
+ *	Disable Single Step
+ */
+static int ptrace_disable_single_step(struct task_struct *task)
+{
+	/*
+	 * Single Step not yet implemented, so must always be disabled
+	 */
+	return 0;
+}
+
+/*
+ * ptrace_disable()
+ *	Make sure the single step bit is not set.
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
+{
+	ptrace_disable_single_step(child);
+}
+
+/*
+ * arch_ptrace()
+ *	architecture specific ptrace routine.
+ */
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+	int ret;
+	switch (request) {
+	/* when I and D space are separate, these will need to be fixed. */
+	case PTRACE_PEEKTEXT: /* read word at location addr. */
+	case PTRACE_PEEKDATA:
+		ret = generic_ptrace_peekdata(child, addr, data);
+		break;
+
+	/* read the word at location addr in the USER area. */
+	case PTRACE_PEEKUSR: {
+		unsigned long tmp;
+
+		ret = -EIO;
+		if (((unsigned long) addr > PT_INTERP_FDPIC_LOADMAP)
+		    || (addr & 3))
+			break;
+
+		tmp = 0;  /* Default return condition */
+
+		ret = -EIO;
+		if (addr < sizeof(struct pt_regs)) {
+			tmp = ptrace_get_reg(child, addr);
+		} else if (addr == PT_TEXT_ADDR) {
+			tmp = child->mm->start_code;
+		} else if (addr == PT_TEXT_END_ADDR) {
+			tmp = child->mm->end_code;
+		} else if (addr == PT_DATA_ADDR) {
+			tmp = child->mm->start_data;
+		} else if (addr == PT_EXEC_FDPIC_LOADMAP) {
+#ifdef CONFIG_BINFMT_ELF_FDPIC
+			tmp = child->mm->context.exec_fdpic_loadmap;
+#endif
+		} else if (addr == PT_INTERP_FDPIC_LOADMAP) {
+#ifdef CONFIG_BINFMT_ELF_FDPIC
+			tmp = child->mm->context.interp_fdpic_loadmap;
+#endif
+		} else {
+			break;
+		}
+
+		ret = put_user(tmp, (unsigned long *)data);
+		break;
+	}
+
+	case PTRACE_POKETEXT: /* write the word at location addr. */
+	case PTRACE_POKEDATA:
+		ret = generic_ptrace_pokedata(child, addr, data);
+
+		/*
+		 * If we just changed some code so we need to
+		 * correct the caches
+		 */
+		if (request == PTRACE_POKETEXT && ret == 0) {
+			flush_icache_range(addr, addr + 4);
+		}
+		break;
+
+	case PTRACE_POKEUSR: /* write the word at location addr
+			      * in the USER area */
+		ret = -EIO;
+
+		if (((unsigned long) addr > PT_DATA_ADDR) || (addr & 3))
+			break;
+
+		if (addr < sizeof(struct pt_regs)) {
+			ret = ptrace_put_reg(child, addr, data);
+		}
+		break;
+
+	case PTRACE_SYSCALL: /* continue and stop at next (return from)
+			      * syscall */
+	case PTRACE_CONT: { /* restart after signal. */
+
+		ret = -EIO;
+		if (!valid_signal(data))
+			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;
+		/* make sure the single step bit is not set. */
+		ptrace_disable_single_step(child);
+		wake_up_process(child);
+		ret = 0;
+		break;
+	}
+
+	/*
+	 * make the child exit.  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;
+		/* make sure the single step bit is not set. */
+		ptrace_disable_single_step(child);
+		wake_up_process(child);
+		break;
+	}
+
+	case PTRACE_DETACH:	/* detach a process that was attached. */
+		ret = ptrace_detach(child, data);
+		break;
+
+	case PTRACE_GETREGS:    /* Get all gp regs from the child. */
+		ptrace_getregs(child, (unsigned long *)data);
+		ret = 0;
+		break;
+
+	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+		int i;
+		unsigned long tmp;
+		int count = sizeof(struct pt_regs) / sizeof(unsigned long);
+		for (i = 0; i < count; i++) {
+			if (get_user(tmp, (unsigned long *) data)) {
+				ret = -EFAULT;
+				break;
+			}
+			ptrace_put_reg(child, sizeof(unsigned long) * i, tmp);
+			data += sizeof(long);
+		}
+		ret = 0;
+		break;
+	}
+
+	default:
+		return ptrace_request(child, request, addr, data);
+		break;
+	}
+	return ret;
+}
+/*
+ * syscall_trace
+ *
+ * called by syscall enter/exit when the TIF_SYSCALL_TRACE bit is set.
+ */
+asmlinkage void syscall_trace(void)
+{
+	struct task_struct *cur = current;
+	if (!test_thread_flag(TIF_SYSCALL_TRACE))
+		return;
+	if (!(cur->ptrace & PT_PTRACED))
+		return;
+	ptrace_notify(SIGTRAP | ((cur->ptrace & PT_TRACESYSGOOD)
+				 ? 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 (cur->exit_code) {
+		send_sig(cur->exit_code, current, 1);
+		current->exit_code = 0;
+	}
+}