From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-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!
---
 arch/um/sys-i386/ptrace_user.c | 131 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 arch/um/sys-i386/ptrace_user.c

(limited to 'arch/um/sys-i386/ptrace_user.c')

diff --git a/arch/um/sys-i386/ptrace_user.c b/arch/um/sys-i386/ptrace_user.c
new file mode 100644
index 0000000..7c376c9
--- /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:
+ */
-- 
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