diff options
Diffstat (limited to 'arch/mips/kernel/mcount.S')
| -rw-r--r-- | arch/mips/kernel/mcount.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S index ffc425979d4f..b50e38d828c4 100644 --- a/arch/mips/kernel/mcount.S +++ b/arch/mips/kernel/mcount.S @@ -93,6 +93,16 @@ NESTED(_mcount, PT_SIZE, ra) PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */ bne t0, t1, static_trace nop + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + PTR_L t2, ftrace_graph_return + bne t0, t2, ftrace_graph_caller + nop + PTR_LA t0, ftrace_graph_entry_stub + PTR_L t2, ftrace_graph_entry + bne t0, t2, ftrace_graph_caller + nop +#endif b ftrace_stub nop @@ -111,5 +121,37 @@ ftrace_stub: #endif /* ! CONFIG_DYNAMIC_FTRACE */ +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + +NESTED(ftrace_graph_caller, PT_SIZE, ra) + MCOUNT_SAVE_REGS + + PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ + move a1, ra /* arg2: next ip, selfaddr */ + jal prepare_ftrace_return + move a2, fp /* arg3: frame pointer */ + + MCOUNT_RESTORE_REGS + RETURN_BACK + END(ftrace_graph_caller) + + .align 2 + .globl return_to_handler +return_to_handler: + PTR_SUBU sp, PT_SIZE + PTR_S v0, PT_R2(sp) + + jal ftrace_return_to_handler + PTR_S v1, PT_R3(sp) + + /* restore the real parent address: v0 -> ra */ + move ra, v0 + + PTR_L v0, PT_R2(sp) + PTR_L v1, PT_R3(sp) + jr ra + PTR_ADDIU sp, PT_SIZE +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + .set at .set reorder |