dccp: do not assume DCCP code is non preemptible
[linux/fpc-iii.git] / arch / s390 / kernel / mcount.S
blobe499370fbccb328561e6ef5ab0bfe35afb4a0b51
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 #ifndef CC_USING_HOTPATCH
31         aghi    %r0,MCOUNT_RETURN_FIXUP
32 #endif
33         aghi    %r15,-STACK_FRAME_SIZE
34         stg     %r1,__SF_BACKCHAIN(%r15)
35         stg     %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
36         stg     %r0,(STACK_PTREGS_PSW+8)(%r15)
37         stmg    %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
38 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
39         aghik   %r2,%r0,-MCOUNT_INSN_SIZE
40         lgrl    %r4,function_trace_op
41         lgrl    %r1,ftrace_trace_function
42 #else
43         lgr     %r2,%r0
44         aghi    %r2,-MCOUNT_INSN_SIZE
45         larl    %r4,function_trace_op
46         lg      %r4,0(%r4)
47         larl    %r1,ftrace_trace_function
48         lg      %r1,0(%r1)
49 #endif
50         lgr     %r3,%r14
51         la      %r5,STACK_PTREGS(%r15)
52         basr    %r14,%r1
53 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
54 # The j instruction gets runtime patched to a nop instruction.
55 # See ftrace_enable_ftrace_graph_caller.
56 ENTRY(ftrace_graph_caller)
57         j       ftrace_graph_caller_end
58         lg      %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
59         lg      %r3,(STACK_PTREGS_PSW+8)(%r15)
60         brasl   %r14,prepare_ftrace_return
61         stg     %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
62 ftrace_graph_caller_end:
63         .globl  ftrace_graph_caller_end
64 #endif
65         lg      %r1,(STACK_PTREGS_PSW+8)(%r15)
66         lmg     %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
67         br      %r1
69 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
71 ENTRY(return_to_handler)
72         stmg    %r2,%r5,32(%r15)
73         lgr     %r1,%r15
74         aghi    %r15,-STACK_FRAME_OVERHEAD
75         stg     %r1,__SF_BACKCHAIN(%r15)
76         brasl   %r14,ftrace_return_to_handler
77         aghi    %r15,STACK_FRAME_OVERHEAD
78         lgr     %r14,%r2
79         lmg     %r2,%r5,32(%r15)
80         br      %r14
82 #endif