| /* |
| * 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 |
