| /* | |
| * Copyright IBM Corp. 2008, 2009 | |
| * | |
| * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, | |
| * | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/asm-offsets.h> | |
| #include <asm/ftrace.h> | |
| .section .kprobes.text, "ax" | |
| ENTRY(ftrace_stub) | |
| br %r14 | |
| ENTRY(_mcount) | |
| #ifdef CONFIG_DYNAMIC_FTRACE | |
| br %r14 | |
| ENTRY(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) | |
| aghi %r2,-MCOUNT_INSN_SIZE | |
| 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) | |
| 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: stg %r2,168(%r15) | |
| #endif | |
| aghi %r15,160 | |
| lmg %r2,%r5,32(%r15) | |
| lg %r14,112(%r15) | |
| br %r14 | |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| ENTRY(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 |