Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 383 insertions, 0 deletions

diff --git a/arch/m68knommu/kernel/ptrace.c b/arch/m68knommu/kernel/ptrace.c
new file mode 100644
index 0000000..15cf790
--- /dev/null
+++ b/arch/m68knommu/kernel/ptrace.c
@@ -0,0 +1,383 @@
+/*
+ *  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/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/config.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 < sizeof(regoff)/sizeof(regoff[0]))
+		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 < sizeof(regoff)/sizeof(regoff[0]))
+		addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
+	else
+		return -1;
+	*addr = data;
+	return 0;
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure the single step bit is not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+	unsigned long tmp;
+	/* make sure the single step bit is not set. */
+	tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
+	put_reg(child, PT_SR, tmp);
+}
+
+asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+{
+	struct task_struct *child;
+	int ret;
+
+	lock_kernel();
+	ret = -EPERM;
+	if (request == PTRACE_TRACEME) {
+		/* are we already being traced? */
+		if (current->ptrace & PT_PTRACED)
+			goto out;
+		/* set the ptrace bit in the process flags. */
+		current->ptrace |= PT_PTRACED;
+		ret = 0;
+		goto out;
+	}
+	ret = -ESRCH;
+	read_lock(&tasklist_lock);
+	child = find_task_by_pid(pid);
+	if (child)
+		get_task_struct(child);
+	read_unlock(&tasklist_lock);
+	if (!child)
+		goto out;
+
+	ret = -EPERM;
+	if (pid == 1)		/* you may not mess with init */
+		goto out_tsk;
+
+	if (request == PTRACE_ATTACH) {
+		ret = ptrace_attach(child);
+		goto out_tsk;
+	}
+	ret = ptrace_check_attach(child, request == PTRACE_KILL);
+	if (ret < 0)
+		goto out_tsk;
+
+	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: {
+			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 */
+			addr = addr >> 2; /* temporary hack. */
+			ret = -EIO;
+			if (addr < 19) {
+				tmp = get_reg(child, addr);
+				if (addr == PT_SR)
+					tmp >>= 16;
+			} else if (addr >= 21 && addr < 49) {
+				tmp = child->thread.fp[addr - 21];
+#ifdef CONFIG_M68KFPU_EMU
+				/* Convert internal fpu reg representation
+				 * into long double format
+				 */
+				if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
+					tmp = ((tmp & 0xffff0000) << 15) |
+					      ((tmp & 0x0000ffff) << 16);
+#endif
+			} else if (addr == 49) {
+				tmp = child->mm->start_code;
+			} else if (addr == 50) {
+				tmp = child->mm->start_data;
+			} else if (addr == 51) {
+				tmp = child->mm->end_code;
+			} else
+				break;
+			ret = put_user(tmp,(unsigned long *) data);
+			break;
+		}
+
+		/* when I and D space are separate, this will have to be fixed. */
+		case PTRACE_POKETEXT: /* write the word at location addr. */
+		case PTRACE_POKEDATA:
+			ret = 0;
+			if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
+				break;
+			ret = -EIO;
+			break;
+
+		case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
+			ret = -EIO;
+			if ((addr & 3) || addr < 0 ||
+			    addr > sizeof(struct user) - 3)
+				break;
+
+			addr = addr >> 2; /* temporary hack. */
+			    
+			if (addr == PT_SR) {
+				data &= SR_MASK;
+				data <<= 16;
+				data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
+			}
+			if (addr < 19) {
+				if (put_reg(child, addr, data))
+					break;
+				ret = 0;
+				break;
+			}
+			if (addr >= 21 && addr < 48)
+			{
+#ifdef CONFIG_M68KFPU_EMU
+				/* Convert long double format
+				 * into internal fpu reg representation
+				 */
+				if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
+					data = (unsigned long)data << 15;
+					data = (data & 0xffff0000) |
+					       ((data & 0x0000ffff) >> 1);
+				}
+#endif
+				child->thread.fp[addr - 21] = data;
+				ret = 0;
+			}
+			break;
+
+		case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
+		case PTRACE_CONT: { /* restart after signal. */
+			long tmp;
+
+			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;
+			/* make sure the single step bit is not set. */
+			tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
+			put_reg(child, PT_SR, tmp);
+			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: {
+			long tmp;
+
+			ret = 0;
+			if (child->exit_state == EXIT_ZOMBIE) /* already dead */
+				break;
+			child->exit_code = SIGKILL;
+			/* make sure the single step bit is not set. */
+			tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
+			put_reg(child, PT_SR, tmp);
+			wake_up_process(child);
+			break;
+		}
+
+		case PTRACE_SINGLESTEP: {  /* set the trap flag. */
+			long tmp;
+
+			ret = -EIO;
+			if ((unsigned long) data > _NSIG)
+				break;
+			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+			tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
+			put_reg(child, PT_SR, tmp);
+
+			child->exit_code = data;
+			/* give it a chance to run. */
+			wake_up_process(child);
+			ret = 0;
+			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. */
+		  	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, (unsigned long *) data)) {
+				ret = -EFAULT;
+				break;
+			    }
+			    data += sizeof(long);
+			}
+			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, (unsigned long *) data)) {
+				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);
+			    data += sizeof(long);
+			}
+			ret = 0;
+			break;
+		}
+
+#ifdef PTRACE_GETFPREGS
+		case PTRACE_GETFPREGS: { /* Get the child FPU state. */
+			ret = 0;
+			if (copy_to_user((void *)data, &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, (void *)data,
+					   sizeof(struct user_m68kfp_struct)))
+				ret = -EFAULT;
+			break;
+		}
+#endif
+
+		default:
+			ret = -EIO;
+			break;
+	}
+out_tsk:
+	put_task_struct(child);
+out:
+	unlock_kernel();
+	return ret;
+}
+
+asmlinkage void syscall_trace(void)
+{
+	if (!test_thread_flag(TIF_SYSCALL_TRACE))
+		return;
+	if (!(current->ptrace & PT_PTRACED))
+		return;
+	ptrace_notify(SIGTRAP | ((current->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 (current->exit_code) {
+		send_sig(current->exit_code, current, 1);
+		current->exit_code = 0;
+	}
+}