i386: move oprofile

[pandora-kernel.git] / arch / i386 / oprofile / backtrace.c

diff --git a/arch/i386/oprofile/backtrace.c b/arch/i386/oprofile/backtrace.c
deleted file mode 100644 (file)
index c049ce4..0000000
--- a/arch/i386/oprofile/backtrace.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/**
- * @file backtrace.c
- *
- * @remark Copyright 2002 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon
- * @author David Smith
- */
-
-#include <linux/oprofile.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-
-struct frame_head {
-       struct frame_head * ebp;
-       unsigned long ret;
-} __attribute__((packed));
-
-static struct frame_head *
-dump_kernel_backtrace(struct frame_head * head)
-{
-       oprofile_add_trace(head->ret);
-
-       /* frame pointers should strictly progress back up the stack
-        * (towards higher addresses) */
-       if (head >= head->ebp)
-               return NULL;
-
-       return head->ebp;
-}
-
-static struct frame_head *
-dump_user_backtrace(struct frame_head * head)
-{
-       struct frame_head bufhead[2];
-
-       /* Also check accessibility of one struct frame_head beyond */
-       if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
-               return NULL;
-       if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
-               return NULL;
-
-       oprofile_add_trace(bufhead[0].ret);
-
-       /* frame pointers should strictly progress back up the stack
-        * (towards higher addresses) */
-       if (head >= bufhead[0].ebp)
-               return NULL;
-
-       return bufhead[0].ebp;
-}
-
-/*
- * |             | /\ Higher addresses
- * |             |
- * --------------- stack base (address of current_thread_info)
- * | thread info |
- * .             .
- * |    stack    |
- * --------------- saved regs->ebp value if valid (frame_head address)
- * .             .
- * --------------- saved regs->rsp value if x86_64
- * |             |
- * --------------- struct pt_regs * stored on stack if 32-bit
- * |             |
- * .             .
- * |             |
- * --------------- %esp
- * |             |
- * |             | \/ Lower addresses
- *
- * Thus, regs (or regs->rsp for x86_64) <-> stack base restricts the
- * valid(ish) ebp values. Note: (1) for x86_64, NMI and several other
- * exceptions use special stacks, maintained by the interrupt stack table
- * (IST). These stacks are set up in trap_init() in
- * arch/x86_64/kernel/traps.c. Thus, for x86_64, regs now does not point
- * to the kernel stack; instead, it points to some location on the NMI
- * stack. On the other hand, regs->rsp is the stack pointer saved when the
- * NMI occurred. (2) For 32-bit, regs->esp is not valid because the
- * processor does not save %esp on the kernel stack when interrupts occur
- * in the kernel mode.
- */
-#ifdef CONFIG_FRAME_POINTER
-static int valid_kernel_stack(struct frame_head * head, struct pt_regs * regs)
-{
-       unsigned long headaddr = (unsigned long)head;
-#ifdef CONFIG_X86_64
-       unsigned long stack = (unsigned long)regs->rsp;
-#else
-       unsigned long stack = (unsigned long)regs;
-#endif
-       unsigned long stack_base = (stack & ~(THREAD_SIZE - 1)) + THREAD_SIZE;
-
-       return headaddr > stack && headaddr < stack_base;
-}
-#else
-/* without fp, it's just junk */
-static int valid_kernel_stack(struct frame_head * head, struct pt_regs * regs)
-{
-       return 0;
-}
-#endif
-
-
-void
-x86_backtrace(struct pt_regs * const regs, unsigned int depth)
-{
-       struct frame_head *head;
-
-#ifdef CONFIG_X86_64
-       head = (struct frame_head *)regs->rbp;
-#else
-       head = (struct frame_head *)regs->ebp;
-#endif
-
-       if (!user_mode_vm(regs)) {
-               while (depth-- && valid_kernel_stack(head, regs))
-                       head = dump_kernel_backtrace(head);
-               return;
-       }
-
-       while (depth-- && head)
-               head = dump_user_backtrace(head);
-}