1 files changed, 131 insertions, 0 deletions

diff --git a/arch/um/sys-i386/ptrace_user.c b/arch/um/sys-i386/ptrace_user.c
new file mode 100644
index 000000000000..7c376c95de50
--- /dev/null
+++ b/arch/um/sys-i386/ptrace_user.c
@@ -0,0 +1,131 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <linux/stddef.h>
+#include "ptrace_user.h"
+/* Grr, asm/user.h includes asm/ptrace.h, so has to follow ptrace_user.h */
+#include <asm/user.h>
+#include "kern_util.h"
+#include "sysdep/thread.h"
+#include "user.h"
+#include "os.h"
+
+int ptrace_getregs(long pid, unsigned long *regs_out)
+{
+        if (ptrace(PTRACE_GETREGS, pid, 0, regs_out) < 0)
+                return -errno;
+        return 0;
+}
+
+int ptrace_setregs(long pid, unsigned long *regs)
+{
+        if (ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
+                return -errno;
+        return 0;
+}
+
+int ptrace_getfpregs(long pid, unsigned long *regs)
+{
+        if (ptrace(PTRACE_GETFPREGS, pid, 0, regs) < 0)
+                return -errno;
+        return 0;
+}
+
+int ptrace_setfpregs(long pid, unsigned long *regs)
+{
+        if (ptrace(PTRACE_SETFPREGS, pid, 0, regs) < 0)
+                return -errno;
+        return 0;
+}
+
+static void write_debugregs(int pid, unsigned long *regs)
+{
+        struct user *dummy;
+        int nregs, i;
+
+        dummy = NULL;
+        nregs = sizeof(dummy->u_debugreg)/sizeof(dummy->u_debugreg[0]);
+        for(i = 0; i < nregs; i++){
+                if((i == 4) || (i == 5)) continue;
+                if(ptrace(PTRACE_POKEUSR, pid, &dummy->u_debugreg[i],
+                          regs[i]) < 0)
+                        printk("write_debugregs - ptrace failed on "
+                               "register %d, value = 0x%x, errno = %d\n", i,
+                               regs[i], errno);
+        }
+}
+
+static void read_debugregs(int pid, unsigned long *regs)
+{
+        struct user *dummy;
+        int nregs, i;
+
+        dummy = NULL;
+        nregs = sizeof(dummy->u_debugreg)/sizeof(dummy->u_debugreg[0]);
+        for(i = 0; i < nregs; i++){
+                regs[i] = ptrace(PTRACE_PEEKUSR, pid,
+                                 &dummy->u_debugreg[i], 0);
+        }
+}
+
+/* Accessed only by the tracing thread */
+static unsigned long kernel_debugregs[8] = { [ 0 ... 7 ] = 0 };
+static int debugregs_seq = 0;
+
+void arch_enter_kernel(void *task, int pid)
+{
+        read_debugregs(pid, TASK_DEBUGREGS(task));
+        write_debugregs(pid, kernel_debugregs);
+}
+
+void arch_leave_kernel(void *task, int pid)
+{
+        read_debugregs(pid, kernel_debugregs);
+        write_debugregs(pid, TASK_DEBUGREGS(task));
+}
+
+void ptrace_pokeuser(unsigned long addr, unsigned long data)
+{
+        if((addr < offsetof(struct user, u_debugreg[0])) ||
+           (addr > offsetof(struct user, u_debugreg[7])))
+                return;
+        addr -= offsetof(struct user, u_debugreg[0]);
+        addr = addr >> 2;
+        if(kernel_debugregs[addr] == data) return;
+
+        kernel_debugregs[addr] = data;
+        debugregs_seq++;
+}
+
+static void update_debugregs_cb(void *arg)
+{
+        int pid = *((int *) arg);
+
+        write_debugregs(pid, kernel_debugregs);
+}
+
+void update_debugregs(int seq)
+{
+        int me;
+
+        if(seq == debugregs_seq) return;
+
+        me = os_getpid();
+        initial_thread_cb(update_debugregs_cb, &me);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */