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-rw-r--r--arch/parisc/kernel/ftrace.c129
1 files changed, 120 insertions, 9 deletions
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index a28f915993b1..d784ccdd8fef 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -7,17 +7,17 @@
* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
*
* future possible enhancements:
- * - add CONFIG_DYNAMIC_FTRACE
* - add CONFIG_STACK_TRACER
*/
#include <linux/init.h>
#include <linux/ftrace.h>
+#include <linux/uaccess.h>
#include <asm/assembly.h>
#include <asm/sections.h>
#include <asm/ftrace.h>
-
+#include <asm/patch.h>
#define __hot __attribute__ ((__section__ (".text.hot")))
@@ -50,13 +50,11 @@ void notrace __hot ftrace_function_trampoline(unsigned long parent,
unsigned long self_addr,
unsigned long org_sp_gr3)
{
- extern ftrace_func_t ftrace_trace_function; /* depends on CONFIG_DYNAMIC_FTRACE */
-
- if (ftrace_trace_function != ftrace_stub) {
- /* struct ftrace_ops *op, struct pt_regs *regs); */
- ftrace_trace_function(parent, self_addr, NULL, NULL);
- return;
- }
+#ifndef CONFIG_DYNAMIC_FTRACE
+ extern ftrace_func_t ftrace_trace_function;
+#endif
+ if (ftrace_trace_function != ftrace_stub)
+ ftrace_trace_function(self_addr, parent, NULL, NULL);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (ftrace_graph_return != (trace_func_graph_ret_t) ftrace_stub ||
@@ -75,3 +73,116 @@ void notrace __hot ftrace_function_trampoline(unsigned long parent,
#endif
}
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+int ftrace_enable_ftrace_graph_caller(void)
+{
+ return 0;
+}
+
+int ftrace_disable_ftrace_graph_caller(void)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+int __init ftrace_dyn_arch_init(void)
+{
+ return 0;
+}
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ return 0;
+}
+
+unsigned long ftrace_call_adjust(unsigned long addr)
+{
+ return addr+(FTRACE_PATCHABLE_FUNCTION_SIZE-1)*4;
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+ u32 insn[FTRACE_PATCHABLE_FUNCTION_SIZE];
+ u32 *tramp;
+ int size, ret, i;
+ void *ip;
+
+#ifdef CONFIG_64BIT
+ unsigned long addr2 =
+ (unsigned long)dereference_function_descriptor((void *)addr);
+
+ u32 ftrace_trampoline[] = {
+ 0x73c10208, /* std,ma r1,100(sp) */
+ 0x0c2110c1, /* ldd -10(r1),r1 */
+ 0xe820d002, /* bve,n (r1) */
+ addr2 >> 32,
+ addr2 & 0xffffffff,
+ 0xe83f1fd7, /* b,l,n .-14,r1 */
+ };
+
+ u32 ftrace_trampoline_unaligned[] = {
+ addr2 >> 32,
+ addr2 & 0xffffffff,
+ 0x37de0200, /* ldo 100(sp),sp */
+ 0x73c13e01, /* std r1,-100(sp) */
+ 0x34213ff9, /* ldo -4(r1),r1 */
+ 0x50213fc1, /* ldd -20(r1),r1 */
+ 0xe820d002, /* bve,n (r1) */
+ 0xe83f1fcf, /* b,l,n .-20,r1 */
+ };
+
+ BUILD_BUG_ON(ARRAY_SIZE(ftrace_trampoline_unaligned) >
+ FTRACE_PATCHABLE_FUNCTION_SIZE);
+#else
+ u32 ftrace_trampoline[] = {
+ (u32)addr,
+ 0x6fc10080, /* stw,ma r1,40(sp) */
+ 0x48213fd1, /* ldw -18(r1),r1 */
+ 0xe820c002, /* bv,n r0(r1) */
+ 0xe83f1fdf, /* b,l,n .-c,r1 */
+ };
+#endif
+
+ BUILD_BUG_ON(ARRAY_SIZE(ftrace_trampoline) >
+ FTRACE_PATCHABLE_FUNCTION_SIZE);
+
+ size = sizeof(ftrace_trampoline);
+ tramp = ftrace_trampoline;
+
+#ifdef CONFIG_64BIT
+ if (rec->ip & 0x4) {
+ size = sizeof(ftrace_trampoline_unaligned);
+ tramp = ftrace_trampoline_unaligned;
+ }
+#endif
+
+ ip = (void *)(rec->ip + 4 - size);
+
+ ret = probe_kernel_read(insn, ip, size);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < size / 4; i++) {
+ if (insn[i] != INSN_NOP)
+ return -EINVAL;
+ }
+
+ __patch_text_multiple(ip, tramp, size);
+ return 0;
+}
+
+int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
+{
+ u32 insn[FTRACE_PATCHABLE_FUNCTION_SIZE];
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(insn); i++)
+ insn[i] = INSN_NOP;
+
+ __patch_text_multiple((void *)rec->ip + 4 - sizeof(insn),
+ insn, sizeof(insn));
+ return 0;
+}
+#endif