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Diffstat (limited to 'arch/blackfin/kernel/ftrace.c')
-rw-r--r--arch/blackfin/kernel/ftrace.c86
1 files changed, 85 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/ftrace.c b/arch/blackfin/kernel/ftrace.c
index a61d948ea925..48808a12b427 100644
--- a/arch/blackfin/kernel/ftrace.c
+++ b/arch/blackfin/kernel/ftrace.c
@@ -1,17 +1,101 @@
/*
* ftrace graph code
*
- * Copyright (C) 2009 Analog Devices Inc.
+ * Copyright (C) 2009-2010 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/sched.h>
+#include <linux/uaccess.h>
#include <asm/atomic.h>
+#include <asm/cacheflush.h>
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+static const unsigned char mnop[] = {
+ 0x03, 0xc0, 0x00, 0x18, /* MNOP; */
+ 0x03, 0xc0, 0x00, 0x18, /* MNOP; */
+};
+
+static void bfin_make_pcrel24(unsigned char *insn, unsigned long src,
+ unsigned long dst)
+{
+ uint32_t pcrel = (dst - src) >> 1;
+ insn[0] = pcrel >> 16;
+ insn[1] = 0xe3;
+ insn[2] = pcrel;
+ insn[3] = pcrel >> 8;
+}
+#define bfin_make_pcrel24(insn, src, dst) bfin_make_pcrel24(insn, src, (unsigned long)(dst))
+
+static int ftrace_modify_code(unsigned long ip, const unsigned char *code,
+ unsigned long len)
+{
+ int ret = probe_kernel_write((void *)ip, (void *)code, len);
+ flush_icache_range(ip, ip + len);
+ return ret;
+}
+
+int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
+{
+ /* Turn the mcount call site into two MNOPs as those are 32bit insns */
+ return ftrace_modify_code(rec->ip, mnop, sizeof(mnop));
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+ /* Restore the mcount call site */
+ unsigned char call[8];
+ call[0] = 0x67; /* [--SP] = RETS; */
+ call[1] = 0x01;
+ bfin_make_pcrel24(&call[2], rec->ip + 2, addr);
+ call[6] = 0x27; /* RETS = [SP++]; */
+ call[7] = 0x01;
+ return ftrace_modify_code(rec->ip, call, sizeof(call));
+}
+
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ unsigned char call[4];
+ unsigned long ip = (unsigned long)&ftrace_call;
+ bfin_make_pcrel24(call, ip, func);
+ return ftrace_modify_code(ip, call, sizeof(call));
+}
+
+int __init ftrace_dyn_arch_init(void *data)
+{
+ /* return value is done indirectly via data */
+ *(unsigned long *)data = 0;
+
+ return 0;
+}
+
+#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+# ifdef CONFIG_DYNAMIC_FTRACE
+
+extern void ftrace_graph_call(void);
+
+int ftrace_enable_ftrace_graph_caller(void)
+{
+ unsigned long ip = (unsigned long)&ftrace_graph_call;
+ uint16_t jump_pcrel12 = ((unsigned long)&ftrace_graph_caller - ip) >> 1;
+ jump_pcrel12 |= 0x2000;
+ return ftrace_modify_code(ip, (void *)&jump_pcrel12, sizeof(jump_pcrel12));
+}
+
+int ftrace_disable_ftrace_graph_caller(void)
+{
+ return ftrace_modify_code((unsigned long)&ftrace_graph_call, empty_zero_page, 2);
+}
+
+# endif
+
/*
* Hook the return address and push it in the stack of return addrs
* in current thread info.