Merge commit 'origin/unwind'

* commit 'origin/unwind':
  Fixes for 2.6.25 pt_regs changes.
  Include string.h
  Change stap to get kernel symbols from debuginfo and
  reincarnate vim/ directory in this branch to match master
  Add new define STP_USE_DWARF_UNWINDER which is set based on which archs
  Remove misleading error message.
  Support for kernels built with CONFIG_FRAME_POINTER
  Fix regression.
  dded _stp_read_address() and changed code to use it.
  kretprobe trampoline fixes
  i386 fixes.
  control.c (_stp_ctl_write_dbug): Insert missing break.
  32-bit fixes
  Cleanup.
  2008-03-23  Frank Ch. Eigler  <fche@elastic.org>
  2008-03-23  Frank Ch. Eigler  <fche@elastic.org>
  2008-03-21  Eugene Teo  <eugeneteo@kernel.sg>
  add (back) runtime/unwind files
  * clarify utility of epilogue-type probe aliases in documentation
  rebased unwind_branch on top of current master

1 files changed, 153 insertions, 0 deletions

diff --git a/runtime/unwind/i386.h b/runtime/unwind/i386.h
new file mode 100644
index 00000000..1f69b4a9
--- /dev/null
+++ b/runtime/unwind/i386.h
@@ -0,0 +1,153 @@
+/* -*- linux-c -*-
+ *
+ * 32-bit x86 dwarf unwinder header file
+ * Copyright (C) 2008 Red Hat Inc.
+ * Copyright (C) 2002-2006 Novell, Inc.
+ * 
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ */
+#ifndef _STP_I386_UNWIND_H
+#define _STP_I386_UNWIND_H
+
+#include <linux/sched.h>
+#include <asm/fixmap.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+/* these are simple for i386 */
+#define _stp_get_unaligned(ptr) (*(ptr))
+#define _stp_put_unaligned(val, ptr) ((void)( *(ptr) = (val) ))
+
+struct unwind_frame_info
+{
+	struct pt_regs regs;
+	struct task_struct *task;
+	unsigned call_frame:1;
+};
+
+#define STACK_LIMIT(ptr)     (((ptr) - 1) & ~(THREAD_SIZE - 1))
+
+#ifdef STAPCONF_X86_UNIREGS
+
+#define UNW_PC(frame)        (frame)->regs.ip
+#define UNW_SP(frame)        (frame)->regs.sp
+#ifdef STP_USE_FRAME_POINTER
+#define UNW_FP(frame)        (frame)->regs.bp
+#define FRAME_RETADDR_OFFSET 4
+#define FRAME_LINK_OFFSET    0
+#define STACK_BOTTOM(tsk)    STACK_LIMIT((tsk)->thread.sp0)
+#define STACK_TOP(tsk)       ((tsk)->thread.sp0)
+#else
+#define UNW_FP(frame) ((void)(frame), 0)
+#endif
+
+#define UNW_REGISTER_INFO \
+	PTREGS_INFO(ax), \
+	PTREGS_INFO(cx), \
+	PTREGS_INFO(dx), \
+	PTREGS_INFO(bx), \
+	PTREGS_INFO(sp), \
+	PTREGS_INFO(bp), \
+	PTREGS_INFO(si), \
+	PTREGS_INFO(di), \
+	PTREGS_INFO(ip)
+
+#else /* !STAPCONF_X86_UNIREGS */
+
+#define UNW_PC(frame)        (frame)->regs.eip
+#define UNW_SP(frame)        (frame)->regs.esp
+#ifdef STP_USE_FRAME_POINTER
+#define UNW_FP(frame)        (frame)->regs.ebp
+#define FRAME_RETADDR_OFFSET 4
+#define FRAME_LINK_OFFSET    0
+#define STACK_BOTTOM(tsk)    STACK_LIMIT((tsk)->thread.esp0)
+#define STACK_TOP(tsk)       ((tsk)->thread.esp0)
+#else
+#define UNW_FP(frame) ((void)(frame), 0)
+#endif
+
+#define UNW_REGISTER_INFO \
+	PTREGS_INFO(eax), \
+	PTREGS_INFO(ecx), \
+	PTREGS_INFO(edx), \
+	PTREGS_INFO(ebx), \
+	PTREGS_INFO(esp), \
+	PTREGS_INFO(ebp), \
+	PTREGS_INFO(esi), \
+	PTREGS_INFO(edi), \
+	PTREGS_INFO(eip)
+
+#endif /* STAPCONF_X86_UNIREGS */
+
+#define UNW_DEFAULT_RA(raItem, dataAlign) \
+	((raItem).where == Memory && \
+	 !((raItem).value * (dataAlign) + 4))
+
+static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
+                                            /*const*/ struct pt_regs *regs)
+{
+	if (user_mode_vm(regs))
+		info->regs = *regs;
+	else {
+#ifdef STAPCONF_X86_UNIREGS
+		memcpy(&info->regs, regs, offsetof(struct pt_regs, sp));
+		info->regs.sp = (unsigned long)&regs->sp;
+		info->regs.ss = __KERNEL_DS;
+#else
+		memcpy(&info->regs, regs, offsetof(struct pt_regs, esp));
+		info->regs.esp = (unsigned long)&regs->esp;
+		info->regs.xss = __KERNEL_DS;		
+#endif
+		
+	}
+	info->call_frame = 1;
+}
+
+static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
+{
+	memset(&info->regs, 0, sizeof(info->regs));
+#ifdef STAPCONF_X86_UNIREGS	
+	info->regs.ip = info->task->thread.ip;
+	info->regs.cs = __KERNEL_CS;
+	__get_user(info->regs.bp, (long *)info->task->thread.sp);
+	info->regs.sp = info->task->thread.sp;
+	info->regs.ss = __KERNEL_DS;
+	info->regs.ds = __USER_DS;
+	info->regs.es = __USER_DS;
+#else
+	info->regs.eip = info->task->thread.eip;
+	info->regs.xcs = __KERNEL_CS;
+	__get_user(info->regs.ebp, (long *)info->task->thread.esp);
+	info->regs.esp = info->task->thread.esp;
+	info->regs.xss = __KERNEL_DS;
+	info->regs.xds = __USER_DS;
+	info->regs.xes = __USER_DS;
+#endif
+	
+}
+
+
+static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
+{
+#if 0 /* This can only work when selector register and EFLAGS saves/restores
+         are properly annotated (and tracked in UNW_REGISTER_INFO). */
+	return user_mode_vm(&info->regs);
+#else
+#ifdef STAPCONF_X86_UNIREGS		
+	return info->regs.ip < PAGE_OFFSET
+	       || (info->regs.ip >= __fix_to_virt(FIX_VDSO)
+	            && info->regs.ip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
+	       || info->regs.sp < PAGE_OFFSET;
+#else
+	return info->regs.eip < PAGE_OFFSET
+	       || (info->regs.eip >= __fix_to_virt(FIX_VDSO)
+	            && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
+	       || info->regs.esp < PAGE_OFFSET;
+#endif	
+#endif
+}
+
+#endif /* _STP_I386_UNWIND_H */