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Blackfin: add support for dynamic ftrace

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Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
2010-07-21 09:13:02 -04:00
parent 67df6cc665
commit f507442962
5 changed files with 182 additions and 10 deletions
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87
arch/blackfin/kernel/ftrace-entry.S
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@@ -10,6 +10,18 @@
.text
#ifdef CONFIG_DYNAMIC_FTRACE
/* Simple stub so we can boot the kernel until runtime patching has
* disabled all calls to this. Then it'll be unused.
*/
ENTRY(__mcount)
# if ANOMALY_05000371
nop; nop; nop; nop;
# endif
rts;
ENDPROC(__mcount)
/* GCC will have called us before setting up the function prologue, so we
* can clobber the normal scratch registers, but we need to make sure to
* save/restore the registers used for argument passing (R0-R2) in case
@@ -20,15 +32,65 @@
* function. And since GCC pushed the previous RETS for us, the previous
* function will be waiting there. mmmm pie.
*/
ENTRY(__mcount)
#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
ENTRY(_ftrace_caller)
# ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
/* optional micro optimization: return if stopped */
p1.l = _function_trace_stop;
p1.h = _function_trace_stop;
r3 = [p1];
cc = r3 == 0;
if ! cc jump _ftrace_stub (bp);
#endif
# endif
/* save first/second/third function arg and the return register */
[--sp] = r2;
[--sp] = r0;
[--sp] = r1;
[--sp] = rets;
/* function_trace_call(unsigned long ip, unsigned long parent_ip):
* ip: this point was called by ...
* parent_ip: ... this function
* the ip itself will need adjusting for the mcount call
*/
r0 = rets;
r1 = [sp + 16]; /* skip the 4 local regs on stack */
r0 += -MCOUNT_INSN_SIZE;
.globl _ftrace_call
_ftrace_call:
call _ftrace_stub
# ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl _ftrace_graph_call
_ftrace_graph_call:
nop; /* jump _ftrace_graph_caller; */
# endif
/* restore state and get out of dodge */
.Lfinish_trace:
rets = [sp++];
r1 = [sp++];
r0 = [sp++];
r2 = [sp++];
.globl _ftrace_stub
_ftrace_stub:
rts;
ENDPROC(_ftrace_caller)
#else
/* See documentation for _ftrace_caller */
ENTRY(__mcount)
# ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
/* optional micro optimization: return if stopped */
p1.l = _function_trace_stop;
p1.h = _function_trace_stop;
r3 = [p1];
cc = r3 == 0;
if ! cc jump _ftrace_stub (bp);
# endif
/* save third function arg early so we can do testing below */
[--sp] = r2;
@@ -44,7 +106,7 @@ ENTRY(__mcount)
cc = r2 == r3;
if ! cc jump .Ldo_trace;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
# ifdef CONFIG_FUNCTION_GRAPH_TRACER
/* if the ftrace_graph_return function pointer is not set to
* the ftrace_stub entry, call prepare_ftrace_return().
*/
@@ -64,7 +126,7 @@ ENTRY(__mcount)
r3 = [p0];
cc = r2 == r3;
if ! cc jump _ftrace_graph_caller;
#endif
# endif
r2 = [sp++];
rts;
@@ -103,6 +165,8 @@ _ftrace_stub:
rts;
ENDPROC(__mcount)
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/* The prepare_ftrace_return() function is similar to the trace function
* except it takes a pointer to the location of the frompc. This is so
@@ -110,6 +174,7 @@ ENDPROC(__mcount)
* purposes.
*/
ENTRY(_ftrace_graph_caller)
# ifndef CONFIG_DYNAMIC_FTRACE
/* save first/second function arg and the return register */
[--sp] = r0;
[--sp] = r1;
@@ -118,9 +183,13 @@ ENTRY(_ftrace_graph_caller)
/* prepare_ftrace_return(parent, self_addr, frame_pointer) */
r0 = sp; /* unsigned long *parent */
r1 = rets; /* unsigned long self_addr */
#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
# else
r0 = sp; /* unsigned long *parent */
r1 = [sp]; /* unsigned long self_addr */
# endif
# ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
r2 = fp; /* unsigned long frame_pointer */
#endif
# endif
r0 += 16; /* skip the 4 local regs on stack */
r1 += -MCOUNT_INSN_SIZE;
call _prepare_ftrace_return;
@@ -139,9 +208,9 @@ ENTRY(_return_to_handler)
[--sp] = r1;
/* get original return address */
#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
# ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
r0 = fp; /* Blackfin is sane, so omit this */
#endif
# endif
call _ftrace_return_to_handler;
rets = r0;