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microblaze: ftrace: Add dynamic function graph tracer

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This patch add support for dynamic function graph tracer.

There is one my expactation that I can do flush_icache after
all code modification. On microblaze is this safer than do
flush for every entry. For icache is used name flush but
correct should be invalidation - this will be fix in upcomming
new cache implementaion and WB support.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-11-16 10:34:15 +01:00
parent a0d3e66522
commit 4f911b0daf
2 changed files with 34 additions and 0 deletions
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28
arch/microblaze/kernel/ftrace.c
View File

@ -206,4 +206,32 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ret; return ret;
} }
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
unsigned int old_jump; /* saving place for jump instruction */
int ftrace_enable_ftrace_graph_caller(void)
{
unsigned int ret;
unsigned long ip = (unsigned long)(&ftrace_call_graph);
old_jump = *(unsigned int *)ip; /* save jump over instruction */
ret = ftrace_modify_code(ip, MICROBLAZE_NOP);
flush_icache();
pr_debug("%s: Replace instruction: 0x%x\n", __func__, old_jump);
return ret;
}
int ftrace_disable_ftrace_graph_caller(void)
{
unsigned int ret;
unsigned long ip = (unsigned long)(&ftrace_call_graph);
ret = ftrace_modify_code(ip, old_jump);
flush_icache();
pr_debug("%s\n", __func__);
return ret;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_DYNAMIC_FTRACE */

6
arch/microblaze/kernel/mcount.S
View File

@ -97,6 +97,7 @@ ENTRY(ftrace_caller)
nop; nop;
/* MS: HAVE_FUNCTION_TRACE_MCOUNT_TEST end of checking */ /* MS: HAVE_FUNCTION_TRACE_MCOUNT_TEST end of checking */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER #ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifndef CONFIG_DYNAMIC_FTRACE
lwi r5, r0, ftrace_graph_return; lwi r5, r0, ftrace_graph_return;
addik r6, r0, ftrace_stub; /* asm implementation */ addik r6, r0, ftrace_stub; /* asm implementation */
cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */ cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */
@ -108,6 +109,11 @@ ENTRY(ftrace_caller)
cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */ cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */
beqid r5, end_graph_tracer; beqid r5, end_graph_tracer;
nop; nop;
#else /* CONFIG_DYNAMIC_FTRACE */
NOALIGN_ENTRY(ftrace_call_graph)
/* MS: jump over graph function - replaced from C code */
bri end_graph_tracer
#endif /* CONFIG_DYNAMIC_FTRACE */
addik r5, r1, 120; /* MS: load parent addr */ addik r5, r1, 120; /* MS: load parent addr */
addik r6, r15, 0; /* MS: load current function addr */ addik r6, r15, 0; /* MS: load current function addr */
bralid r15, prepare_ftrace_return; bralid r15, prepare_ftrace_return;