1 files changed, 169 insertions, 0 deletions
diff --git a/tools/debugger/pdb/linux-2.6-module/debug.c b/tools/debugger/pdb/linux-2.6-module/debug.c
new file mode 100644
index 0000000000..744be03b73
--- /dev/null
+++ b/tools/debugger/pdb/linux-2.6-module/debug.c
@@ -0,0 +1,169 @@
+/*
+ * debug.c
+ * pdb debug functionality for processes.
+ */
+
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <asm-xen/asm-i386/ptrace.h>
+#include <asm-xen/xen-public/xen.h>
+
+#include "pdb_module.h"
+
+EXPORT_SYMBOL(pdb_attach);
+EXPORT_SYMBOL(pdb_detach);
+
+int
+pdb_attach (int pid)
+{
+    struct task_struct *target;
+    u32 rc = 0;
+
+    printk ("pdb attach: 0x%x\n", pid);
+
+    read_lock(&tasklist_lock);
+    target = find_task_by_pid(pid);
+    if (target)
+        get_task_struct(target);
+    read_unlock(&tasklist_lock);
+
+    force_sig(SIGSTOP, target);                    /* force_sig_specific ??? */
+
+    return rc;
+}
+
+int
+pdb_detach (int pid)
+{
+    int rc = 0;
+    struct task_struct *target;
+
+    printk ("pdb detach: 0x%x\n", pid);
+
+    read_lock(&tasklist_lock);
+    target = find_task_by_pid(pid);
+    if (target)
+        get_task_struct(target);
+    read_unlock(&tasklist_lock);
+
+    wake_up_process(target);
+
+    return rc;
+}
+
+/*
+ * from linux-2.6.11/arch/i386/kernel/ptrace.c::getreg()
+ */
+int
+pdb_read_register (int pid, pdb_op_rd_reg_p op, unsigned long *dest)
+{
+    int rc = 0;
+    struct task_struct *target;
+    unsigned long offset;
+    unsigned char *stack = 0L;
+
+    *dest = ~0UL;
+
+    read_lock(&tasklist_lock);
+    target = find_task_by_pid(pid);
+    if (target)
+        get_task_struct(target);
+    read_unlock(&tasklist_lock);
+
+    switch (op->reg)
+    {
+    case FS:
+        *dest = target->thread.fs;
+        break;
+    case GS:
+        *dest = target->thread.gs;
+        break;
+    case DS:
+    case ES:
+    case SS:
+    case CS:
+        *dest = 0xffff;
+        /* fall through */
+    default:
+        if (op->reg > GS)
+            op->reg -= 2;
+
+        offset = op->reg * sizeof(long);
+        offset -= sizeof(struct pt_regs);
+        stack = (unsigned char *)target->thread.esp0;
+        stack += offset;
+        *dest &= *((int *)stack);
+    }
+
+    /*
+    printk ("pdb read register: 0x%x %2d 0x%p 0x%lx\n", 
+            pid, op->reg, stack, *dest);
+    */
+
+    return rc;
+}
+
+/*
+ * from linux-2.6.11/arch/i386/kernel/ptrace.c::putreg()
+ */
+int
+pdb_write_register (int pid, pdb_op_wr_reg_p op)
+{
+    int rc = 0;
+    struct task_struct *target;
+    unsigned long offset;
+    unsigned char *stack;
+    unsigned long value = op->value;
+
+    /*
+    printk ("pdb write register: 0x%x %2d 0x%lx\n", pid, op->reg, value);
+    */
+
+    read_lock(&tasklist_lock);
+    target = find_task_by_pid(pid);
+    if (target)
+        get_task_struct(target);
+    read_unlock(&tasklist_lock);
+
+    switch (op->reg)
+    {
+    case FS:
+        target->thread.fs = value;
+        return rc;
+    case GS:
+        target->thread.gs = value;
+        return rc;
+    case DS:
+    case ES:
+        value &= 0xffff;
+        break;
+    case SS:
+    case CS:
+        value &= 0xffff;
+        break;
+    case EFL:
+        break;
+    }
+
+    if (op->reg > GS)
+        op->reg -= 2;
+    offset = op->reg * sizeof(long);
+    offset -= sizeof(struct pt_regs);
+    stack = (unsigned char *)target->thread.esp0;
+    stack += offset;
+    *(unsigned long *) stack = op->value;
+
+    return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
+