diff options
Diffstat (limited to 'arch/s390/kernel/mcount.S')
| -rw-r--r-- | arch/s390/kernel/mcount.S | 52 |
1 files changed, 18 insertions, 34 deletions
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S index dfe015d7398..08dcf21cb8d 100644 --- a/arch/s390/kernel/mcount.S +++ b/arch/s390/kernel/mcount.S @@ -1,37 +1,28 @@ /* - * Copyright IBM Corp. 2008,2009 + * 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> - .globl ftrace_stub -ftrace_stub: + .section .kprobes.text, "ax" + +ENTRY(ftrace_stub) br %r14 - .globl _mcount -_mcount: +ENTRY(_mcount) #ifdef CONFIG_DYNAMIC_FTRACE br %r14 - .data - .globl ftrace_dyn_func -ftrace_dyn_func: - .long ftrace_stub - .previous - - .globl ftrace_caller -ftrace_caller: +ENTRY(ftrace_caller) #endif stm %r2,%r5,16(%r15) bras %r1,2f -#ifdef CONFIG_DYNAMIC_FTRACE -0: .long ftrace_dyn_func -#else 0: .long ftrace_trace_function -#endif 1: .long function_trace_stop 2: l %r2,1b-0b(%r1) icm %r2,0xf,0(%r2) @@ -43,25 +34,19 @@ ftrace_caller: la %r2,0(%r14) st %r0,__SF_BACKCHAIN(%r15) la %r3,0(%r3) + ahi %r2,-MCOUNT_INSN_SIZE l %r14,0b-0b(%r1) l %r14,0(%r14) basr %r14,%r14 #ifdef CONFIG_FUNCTION_GRAPH_TRACER -#ifdef CONFIG_DYNAMIC_FTRACE - .globl ftrace_graph_caller -ftrace_graph_caller: - # This unconditional branch gets runtime patched. Change only if - # you know what you are doing. See ftrace_enable_graph_caller(). - j 1f -#endif - bras %r1,0f - .long prepare_ftrace_return -0: l %r2,152(%r15) - l %r4,0(%r1) - l %r3,100(%r15) - basr %r14,%r4 - st %r2,100(%r15) -1: + 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) @@ -70,8 +55,7 @@ ftrace_graph_caller: #ifdef CONFIG_FUNCTION_GRAPH_TRACER - .globl return_to_handler -return_to_handler: +ENTRY(return_to_handler) stm %r2,%r5,16(%r15) st %r14,56(%r15) lr %r0,%r15 |