1 files changed, 116 insertions, 0 deletions

diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
new file mode 100644
index 000000000000..76d50e6091bc
--- /dev/null
+++ b/arch/arm/kernel/ftrace.c
@@ -0,0 +1,116 @@
+/*
+ * Dynamic function tracing support.
+ *
+ * Copyright (C) 2008 Abhishek Sagar <sagar.abhishek@gmail.com>
+ *
+ * For licencing details, see COPYING.
+ *
+ * Defines low-level handling of mcount calls when the kernel
+ * is compiled with the -pg flag. When using dynamic ftrace, the
+ * mcount call-sites get patched lazily with NOP till they are
+ * enabled. All code mutation routines here take effect atomically.
+ */
+
+#include <linux/ftrace.h>
+
+#include <asm/cacheflush.h>
+#include <asm/ftrace.h>
+
+#define PC_OFFSET      8
+#define BL_OPCODE      0xeb000000
+#define BL_OFFSET_MASK 0x00ffffff
+
+static unsigned long bl_insn;
+static const unsigned long NOP = 0xe1a00000; /* mov r0, r0 */
+
+unsigned char *ftrace_nop_replace(void)
+{
+        return (char *)&NOP;
+}
+
+/* construct a branch (BL) instruction to addr */
+unsigned char *ftrace_call_replace(unsigned long pc, unsigned long addr)
+{
+        long offset;
+
+        offset = (long)addr - (long)(pc + PC_OFFSET);
+        if (unlikely(offset < -33554432 || offset > 33554428)) {
+                /* Can't generate branches that far (from ARM ARM). Ftrace
+                 * doesn't generate branches outside of kernel text.
+                 */
+                WARN_ON_ONCE(1);
+                return NULL;
+        }
+        offset = (offset >> 2) & BL_OFFSET_MASK;
+        bl_insn = BL_OPCODE | offset;
+        return (unsigned char *)&bl_insn;
+}
+
+int ftrace_modify_code(unsigned long pc, unsigned char *old_code,
+                       unsigned char *new_code)
+{
+        unsigned long err = 0, replaced = 0, old, new;
+
+        old = *(unsigned long *)old_code;
+        new = *(unsigned long *)new_code;
+
+        __asm__ __volatile__ (
+                "1:  ldr    %1, [%2]  \n"
+                "    cmp    %1, %4    \n"
+                "2:  streq  %3, [%2]  \n"
+                "    cmpne  %1, %3    \n"
+                "    movne  %0, #2    \n"
+                "3:\n"
+
+                ".section .fixup, \"ax\"\n"
+                "4:  mov  %0, #1  \n"
+                "    b    3b      \n"
+                ".previous\n"
+
+                ".section __ex_table, \"a\"\n"
+                "    .long 1b, 4b \n"
+                "    .long 2b, 4b \n"
+                ".previous\n"
+
+                : "=r"(err), "=r"(replaced)
+                : "r"(pc), "r"(new), "r"(old), "0"(err), "1"(replaced)
+                : "memory");
+
+        if (!err && (replaced == old))
+                flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
+
+        return err;
+}
+
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+        int ret;
+        unsigned long pc, old;
+        unsigned char *new;
+
+        pc = (unsigned long)&ftrace_call;
+        memcpy(&old, &ftrace_call, MCOUNT_INSN_SIZE);
+        new = ftrace_call_replace(pc, (unsigned long)func);
+        ret = ftrace_modify_code(pc, (unsigned char *)&old, new);
+        return ret;
+}
+
+int ftrace_mcount_set(unsigned long *data)
+{
+        unsigned long pc, old;
+        unsigned long *addr = data;
+        unsigned char *new;
+
+        pc = (unsigned long)&mcount_call;
+        memcpy(&old, &mcount_call, MCOUNT_INSN_SIZE);
+        new = ftrace_call_replace(pc, *addr);
+        *addr = ftrace_modify_code(pc, (unsigned char *)&old, new);
+        return 0;
+}
+
+/* run from kstop_machine */
+int __init ftrace_dyn_arch_init(void *data)
+{
+        ftrace_mcount_set(data);
+        return 0;
+}