/* | |
* Copyright IBM Corp. 2008,2009 | |
* | |
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, | |
* | |
*/ | |
#include <linux/linkage.h> | |
#include <asm/asm-offsets.h> | |
.section .kprobes.text, "ax" | |
ENTRY(ftrace_stub) | |
br %r14 | |
ENTRY(_mcount) | |
#ifdef CONFIG_DYNAMIC_FTRACE | |
br %r14 | |
ENTRY(ftrace_caller) | |
#endif | |
stm %r2,%r5,16(%r15) | |
bras %r1,2f | |
0: .long ftrace_trace_function | |
1: .long function_trace_stop | |
2: l %r2,1b-0b(%r1) | |
icm %r2,0xf,0(%r2) | |
jnz 3f | |
st %r14,56(%r15) | |
lr %r0,%r15 | |
ahi %r15,-96 | |
l %r3,100(%r15) | |
la %r2,0(%r14) | |
st %r0,__SF_BACKCHAIN(%r15) | |
la %r3,0(%r3) | |
l %r14,0b-0b(%r1) | |
l %r14,0(%r14) | |
basr %r14,%r14 | |
#ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
l %r2,100(%r15) | |
l %r3,152(%r15) | |
ENTRY(ftrace_graph_caller) | |
# The bras instruction gets runtime patched to call prepare_ftrace_return. | |
# See ftrace_enable_ftrace_graph_caller. The patched instruction is: | |
# bras %r14,prepare_ftrace_return | |
bras %r14,0f | |
0: st %r2,100(%r15) | |
#endif | |
ahi %r15,96 | |
l %r14,56(%r15) | |
3: lm %r2,%r5,16(%r15) | |
br %r14 | |
#ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
ENTRY(return_to_handler) | |
stm %r2,%r5,16(%r15) | |
st %r14,56(%r15) | |
lr %r0,%r15 | |
ahi %r15,-96 | |
st %r0,__SF_BACKCHAIN(%r15) | |
bras %r1,0f | |
.long ftrace_return_to_handler | |
0: l %r2,0b-0b(%r1) | |
basr %r14,%r2 | |
lr %r14,%r2 | |
ahi %r15,96 | |
lm %r2,%r5,16(%r15) | |
br %r14 | |
#endif |