1 files changed, 206 insertions, 0 deletions

diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
new file mode 100644
index 000000000000..7fc8c961b1f7
--- /dev/null
+++ b/arch/ia64/kernel/ftrace.c
@@ -0,0 +1,206 @@
+/*
+ * Dynamic function tracing support.
+ *
+ * Copyright (C) 2008 Shaohua Li <shaohua.li@intel.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/uaccess.h>
+#include <linux/ftrace.h>
+
+#include <asm/cacheflush.h>
+#include <asm/patch.h>
+
+/* In IA64, each function will be added below two bundles with -pg option */
+static unsigned char __attribute__((aligned(8)))
+ftrace_orig_code[MCOUNT_INSN_SIZE] = {
+        0x02, 0x40, 0x31, 0x10, 0x80, 0x05, /* alloc r40=ar.pfs,12,8,0 */
+        0xb0, 0x02, 0x00, 0x00, 0x42, 0x40, /* mov r43=r0;; */
+        0x05, 0x00, 0xc4, 0x00,             /* mov r42=b0 */
+        0x11, 0x48, 0x01, 0x02, 0x00, 0x21, /* mov r41=r1 */
+        0x00, 0x00, 0x00, 0x02, 0x00, 0x00, /* nop.i 0x0 */
+        0x08, 0x00, 0x00, 0x50              /* br.call.sptk.many b0 = _mcount;; */
+};
+
+struct ftrace_orig_insn {
+        u64 dummy1, dummy2, dummy3;
+        u64 dummy4:64-41+13;
+        u64 imm20:20;
+        u64 dummy5:3;
+        u64 sign:1;
+        u64 dummy6:4;
+};
+
+/* mcount stub will be converted below for nop */
+static unsigned char ftrace_nop_code[MCOUNT_INSN_SIZE] = {
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+        0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+        0x00, 0x00, 0x04, 0x00,             /* nop.i 0x0 */
+        0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* nop.x 0x0;; */
+        0x00, 0x00, 0x04, 0x00
+};
+
+static unsigned char *ftrace_nop_replace(void)
+{
+        return ftrace_nop_code;
+}
+
+/*
+ * mcount stub will be converted below for call
+ * Note: Just the last instruction is changed against nop
+ * */
+static unsigned char __attribute__((aligned(8)))
+ftrace_call_code[MCOUNT_INSN_SIZE] = {
+        0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+        0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+        0x00, 0x00, 0x04, 0x00,             /* nop.i 0x0 */
+        0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+        0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, /* brl.many .;;*/
+        0xf8, 0xff, 0xff, 0xc8
+};
+
+struct ftrace_call_insn {
+        u64 dummy1, dummy2;
+        u64 dummy3:48;
+        u64 imm39_l:16;
+        u64 imm39_h:23;
+        u64 dummy4:13;
+        u64 imm20:20;
+        u64 dummy5:3;
+        u64 i:1;
+        u64 dummy6:4;
+};
+
+static unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
+{
+        struct ftrace_call_insn *code = (void *)ftrace_call_code;
+        unsigned long offset = addr - (ip + 0x10);
+
+        code->imm39_l = offset >> 24;
+        code->imm39_h = offset >> 40;
+        code->imm20 = offset >> 4;
+        code->i = offset >> 63;
+        return ftrace_call_code;
+}
+
+static int
+ftrace_modify_code(unsigned long ip, unsigned char *old_code,
+                   unsigned char *new_code, int do_check)
+{
+        unsigned char replaced[MCOUNT_INSN_SIZE];
+
+        /*
+         * Note: Due to modules and __init, code can
+         *  disappear and change, we need to protect against faulting
+         *  as well as code changing. We do this by using the
+         *  probe_kernel_* functions.
+         *
+         * No real locking needed, this code is run through
+         * kstop_machine, or before SMP starts.
+         */
+
+        if (!do_check)
+                goto skip_check;
+
+        /* read the text we want to modify */
+        if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+                return -EFAULT;
+
+        /* Make sure it is what we expect it to be */
+        if (memcmp(replaced, old_code, MCOUNT_INSN_SIZE) != 0)
+                return -EINVAL;
+
+skip_check:
+        /* replace the text with the new text */
+        if (probe_kernel_write(((void *)ip), new_code, MCOUNT_INSN_SIZE))
+                return -EPERM;
+        flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);
+
+        return 0;
+}
+
+static int ftrace_make_nop_check(struct dyn_ftrace *rec, unsigned long addr)
+{
+        unsigned char __attribute__((aligned(8))) replaced[MCOUNT_INSN_SIZE];
+        unsigned long ip = rec->ip;
+
+        if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+                return -EFAULT;
+        if (rec->flags & FTRACE_FL_CONVERTED) {
+                struct ftrace_call_insn *call_insn, *tmp_call;
+
+                call_insn = (void *)ftrace_call_code;
+                tmp_call = (void *)replaced;
+                call_insn->imm39_l = tmp_call->imm39_l;
+                call_insn->imm39_h = tmp_call->imm39_h;
+                call_insn->imm20 = tmp_call->imm20;
+                call_insn->i = tmp_call->i;
+                if (memcmp(replaced, ftrace_call_code, MCOUNT_INSN_SIZE) != 0)
+                        return -EINVAL;
+                return 0;
+        } else {
+                struct ftrace_orig_insn *call_insn, *tmp_call;
+
+                call_insn = (void *)ftrace_orig_code;
+                tmp_call = (void *)replaced;
+                call_insn->sign = tmp_call->sign;
+                call_insn->imm20 = tmp_call->imm20;
+                if (memcmp(replaced, ftrace_orig_code, MCOUNT_INSN_SIZE) != 0)
+                        return -EINVAL;
+                return 0;
+        }
+}
+
+int ftrace_make_nop(struct module *mod,
+                    struct dyn_ftrace *rec, unsigned long addr)
+{
+        int ret;
+        char *new;
+
+        ret = ftrace_make_nop_check(rec, addr);
+        if (ret)
+                return ret;
+        new = ftrace_nop_replace();
+        return ftrace_modify_code(rec->ip, NULL, new, 0);
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+        unsigned long ip = rec->ip;
+        unsigned char *old, *new;
+
+        old=  ftrace_nop_replace();
+        new = ftrace_call_replace(ip, addr);
+        return ftrace_modify_code(ip, old, new, 1);
+}
+
+/* in IA64, _mcount can't directly call ftrace_stub. Only jump is ok */
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+        unsigned long ip;
+        unsigned long addr = ((struct fnptr *)ftrace_call)->ip;
+
+        if (func == ftrace_stub)
+                return 0;
+        ip = ((struct fnptr *)func)->ip;
+
+        ia64_patch_imm64(addr + 2, ip);
+
+        flush_icache_range(addr, addr + 16);
+        return 0;
+}
+
+/* run from kstop_machine */
+int __init ftrace_dyn_arch_init(void *data)
+{
+        *(unsigned long *)data = 0;
+
+        return 0;
+}