ftrace: core support for ARM
Core ftrace support for the ARM architecture, which includes support
for dynamic function tracing.
Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
new file mode 100644
index 0000000..f4cb4cc
--- /dev/null
+++ b/arch/arm/kernel/ftrace.c
@@ -0,0 +1,128 @@
+/*
+ * 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>
+
+#define INSN_SIZE 4
+#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 */
+
+/* return true if mcount call site is already patched/no-op'ed */
+int ftrace_ip_converted(unsigned long pc)
+{
+ unsigned long save;
+
+ pc -= INSN_SIZE;
+ save = *(unsigned long *)pc;
+ return save == NOP;
+}
+
+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 - INSN_SIZE + PC_OFFSET);
+ if (unlikely(offset < -33554432 || offset > 33554428)) {
+ /* Can't generate branches that far (from ARM ARM). Ftrace
+ * doesn't generate branches outside of core 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;
+ pc -= INSN_SIZE;
+
+ __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 + 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;
+ pc += INSN_SIZE;
+ memcpy(&old, &ftrace_call, 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;
+ pc += INSN_SIZE;
+ memcpy(&old, &mcount_call, 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;
+}