/* | |
* Copyright IBM Corp. 2008,2009 | |
* | |
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, | |
* | |
*/ | |
#include <asm/asm-offsets.h> | |
.section .kprobes.text, "ax" | |
.globl ftrace_stub | |
ftrace_stub: | |
br %r14 | |
.globl _mcount | |
_mcount: | |
#ifdef CONFIG_DYNAMIC_FTRACE | |
br %r14 | |
.globl ftrace_caller | |
ftrace_caller: | |
#endif | |
larl %r1,function_trace_stop | |
icm %r1,0xf,0(%r1) | |
bnzr %r14 | |
stmg %r2,%r5,32(%r15) | |
stg %r14,112(%r15) | |
lgr %r1,%r15 | |
aghi %r15,-160 | |
stg %r1,__SF_BACKCHAIN(%r15) | |
lgr %r2,%r14 | |
lg %r3,168(%r15) | |
larl %r14,ftrace_trace_function | |
lg %r14,0(%r14) | |
basr %r14,%r14 | |
#ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
lg %r2,168(%r15) | |
lg %r3,272(%r15) | |
.globl ftrace_graph_caller | |
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: stg %r2,168(%r15) | |
#endif | |
aghi %r15,160 | |
lmg %r2,%r5,32(%r15) | |
lg %r14,112(%r15) | |
br %r14 | |
#ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
.globl return_to_handler | |
return_to_handler: | |
stmg %r2,%r5,32(%r15) | |
lgr %r1,%r15 | |
aghi %r15,-160 | |
stg %r1,__SF_BACKCHAIN(%r15) | |
brasl %r14,ftrace_return_to_handler | |
aghi %r15,160 | |
lgr %r14,%r2 | |
lmg %r2,%r5,32(%r15) | |
br %r14 | |
#endif |