Merge branch 'for-3.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux/fpc-iii.git] / arch / s390 / kernel / mcount.S
blob4300ea3748263d582d3baee7f1cdf8a7e2499dd6
1 /*
2  * Copyright IBM Corp. 2008, 2009
3  *
4  *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
5  *
6  */
8 #include <linux/linkage.h>
9 #include <asm/asm-offsets.h>
10 #include <asm/ftrace.h>
11 #include <asm/ptrace.h>
13         .section .kprobes.text, "ax"
15 ENTRY(ftrace_stub)
16         br      %r14
18 #define STACK_FRAME_SIZE  (STACK_FRAME_OVERHEAD + __PT_SIZE)
19 #define STACK_PTREGS      (STACK_FRAME_OVERHEAD)
20 #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
21 #define STACK_PTREGS_PSW  (STACK_PTREGS + __PT_PSW)
23 ENTRY(_mcount)
24         br      %r14
26 ENTRY(ftrace_caller)
27         .globl  ftrace_regs_caller
28         .set    ftrace_regs_caller,ftrace_caller
29         lgr     %r1,%r15
30         aghi    %r15,-STACK_FRAME_SIZE
31         stg     %r1,__SF_BACKCHAIN(%r15)
32         stg     %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
33         stg     %r0,(STACK_PTREGS_PSW+8)(%r15)
34         stmg    %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
35 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
36         aghik   %r2,%r0,-MCOUNT_INSN_SIZE
37         lgrl    %r4,function_trace_op
38         lgrl    %r1,ftrace_trace_function
39 #else
40         lgr     %r2,%r0
41         aghi    %r2,-MCOUNT_INSN_SIZE
42         larl    %r4,function_trace_op
43         lg      %r4,0(%r4)
44         larl    %r1,ftrace_trace_function
45         lg      %r1,0(%r1)
46 #endif
47         lgr     %r3,%r14
48         la      %r5,STACK_PTREGS(%r15)
49         basr    %r14,%r1
50 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
51 # The j instruction gets runtime patched to a nop instruction.
52 # See ftrace_enable_ftrace_graph_caller.
53 ENTRY(ftrace_graph_caller)
54         j       ftrace_graph_caller_end
55         lg      %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
56         lg      %r3,(STACK_PTREGS_PSW+8)(%r15)
57         brasl   %r14,prepare_ftrace_return
58         stg     %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
59 ftrace_graph_caller_end:
60         .globl  ftrace_graph_caller_end
61 #endif
62         lg      %r1,(STACK_PTREGS_PSW+8)(%r15)
63         lmg     %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
64         br      %r1
66 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
68 ENTRY(return_to_handler)
69         stmg    %r2,%r5,32(%r15)
70         lgr     %r1,%r15
71         aghi    %r15,-STACK_FRAME_OVERHEAD
72         stg     %r1,__SF_BACKCHAIN(%r15)
73         brasl   %r14,ftrace_return_to_handler
74         aghi    %r15,STACK_FRAME_OVERHEAD
75         lgr     %r14,%r2
76         lmg     %r2,%r5,32(%r15)
77         br      %r14
79 #endif