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ftrace: Make get_ftrace_addr() and get_ftrace_addr_old() global

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Move and rename get_ftrace_addr() and get_ftrace_addr_old() to
ftrace_get_addr_new() and ftrace_get_addr_curr() respectively.

This moves these two helper functions in the generic code out from
the arch specific code, and renames them to have a better generic
name. This will allow other archs to use them as well as makes it
a bit easier to work on getting separate trampolines for different
functions.

ftrace_get_addr_new() returns the trampoline address that the mcount
call address will be converted to.

ftrace_get_addr_curr() returns the trampoline address of what the
mcount call address currently jumps to.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-05-06 21:34:14 -04:00 • committed by Steven Rostedt
commit 7413af1fb7
3 changed files with 43 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

36
arch/x86/kernel/ftrace.c
View file

@ -349,38 +349,12 @@ static int add_brk_on_nop(struct dyn_ftrace *rec)
return add_break(rec->ip, old);
}
/*
* If the record has the FTRACE_FL_REGS set, that means that it
* wants to convert to a callback that saves all regs. If FTRACE_FL_REGS
* is not not set, then it wants to convert to the normal callback.
*/
static unsigned long get_ftrace_addr(struct dyn_ftrace *rec)
{
if (rec->flags & FTRACE_FL_REGS)
return (unsigned long)FTRACE_REGS_ADDR;
else
return (unsigned long)FTRACE_ADDR;
}
/*
* The FTRACE_FL_REGS_EN is set when the record already points to
* a function that saves all the regs. Basically the '_EN' version
* represents the current state of the function.
*/
static unsigned long get_ftrace_old_addr(struct dyn_ftrace *rec)
{
if (rec->flags & FTRACE_FL_REGS_EN)
return (unsigned long)FTRACE_REGS_ADDR;
else
return (unsigned long)FTRACE_ADDR;
}
static int add_breakpoints(struct dyn_ftrace *rec, int enable)
{
unsigned long ftrace_addr;
int ret;
ftrace_addr = get_ftrace_old_addr(rec);
ftrace_addr = ftrace_get_addr_curr(rec);
ret = ftrace_test_record(rec, enable);
@ -438,14 +412,14 @@ static int remove_breakpoint(struct dyn_ftrace *rec)
* If not, don't touch the breakpoint, we make just create
* a disaster.
*/
ftrace_addr = get_ftrace_addr(rec);
ftrace_addr = ftrace_get_addr_new(rec);
nop = ftrace_call_replace(ip, ftrace_addr);
if (memcmp(&ins[1], &nop[1], MCOUNT_INSN_SIZE - 1) == 0)
goto update;
/* Check both ftrace_addr and ftrace_old_addr */
ftrace_addr = get_ftrace_old_addr(rec);
ftrace_addr = ftrace_get_addr_curr(rec);
nop = ftrace_call_replace(ip, ftrace_addr);
if (memcmp(&ins[1], &nop[1], MCOUNT_INSN_SIZE - 1) != 0)
@ -489,7 +463,7 @@ static int add_update(struct dyn_ftrace *rec, int enable)
ret = ftrace_test_record(rec, enable);
ftrace_addr = get_ftrace_addr(rec);
ftrace_addr = ftrace_get_addr_new(rec);
switch (ret) {
case FTRACE_UPDATE_IGNORE:
@ -536,7 +510,7 @@ static int finish_update(struct dyn_ftrace *rec, int enable)
ret = ftrace_update_record(rec, enable);
ftrace_addr = get_ftrace_addr(rec);
ftrace_addr = ftrace_get_addr_new(rec);
switch (ret) {
case FTRACE_UPDATE_IGNORE:

2
include/linux/ftrace.h
View file

@ -400,6 +400,8 @@ int ftrace_update_record(struct dyn_ftrace *rec, int enable);
int ftrace_test_record(struct dyn_ftrace *rec, int enable);
void ftrace_run_stop_machine(int command);
unsigned long ftrace_location(unsigned long ip);
unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);
unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
extern ftrace_func_t ftrace_trace_function;

36
kernel/trace/ftrace.c
View file

@ -1755,6 +1755,42 @@ int ftrace_test_record(struct dyn_ftrace *rec, int enable)
return ftrace_check_record(rec, enable, 0);
}
/**
* ftrace_get_addr_new - Get the call address to set to
* @rec: The ftrace record descriptor
*
* If the record has the FTRACE_FL_REGS set, that means that it
* wants to convert to a callback that saves all regs. If FTRACE_FL_REGS
* is not not set, then it wants to convert to the normal callback.
*
* Returns the address of the trampoline to set to
*/
unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec)
{
if (rec->flags & FTRACE_FL_REGS)
return (unsigned long)FTRACE_REGS_ADDR;
else
return (unsigned long)FTRACE_ADDR;
}
/**
* ftrace_get_addr_curr - Get the call address that is already there
* @rec: The ftrace record descriptor
*
* The FTRACE_FL_REGS_EN is set when the record already points to
* a function that saves all the regs. Basically the '_EN' version
* represents the current state of the function.
*
* Returns the address of the trampoline that is currently being called
*/
unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec)
{
if (rec->flags & FTRACE_FL_REGS_EN)
return (unsigned long)FTRACE_REGS_ADDR;
else
return (unsigned long)FTRACE_ADDR;
}
static int
__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
{