2 * Copyright IBM Corp. 2008, 2009
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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"
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)
27 .globl ftrace_regs_caller
28 .set ftrace_regs_caller,ftrace_caller
30 aghi %r0,MCOUNT_RETURN_FIXUP
31 aghi %r15,-STACK_FRAME_SIZE
32 stg %r1,__SF_BACKCHAIN(%r15)
33 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
34 stg %r0,(STACK_PTREGS_PSW+8)(%r15)
35 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
36 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
37 aghik %r2,%r0,-MCOUNT_INSN_SIZE
38 lgrl %r4,function_trace_op
39 lgrl %r1,ftrace_trace_function
42 aghi %r2,-MCOUNT_INSN_SIZE
43 larl %r4,function_trace_op
45 larl %r1,ftrace_trace_function
49 la %r5,STACK_PTREGS(%r15)
51 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
52 # The j instruction gets runtime patched to a nop instruction.
53 # See ftrace_enable_ftrace_graph_caller.
54 ENTRY(ftrace_graph_caller)
55 j ftrace_graph_caller_end
56 lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
57 lg %r3,(STACK_PTREGS_PSW+8)(%r15)
58 brasl %r14,prepare_ftrace_return
59 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
60 ftrace_graph_caller_end:
61 .globl ftrace_graph_caller_end
63 lg %r1,(STACK_PTREGS_PSW+8)(%r15)
64 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
67 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
69 ENTRY(return_to_handler)
72 aghi %r15,-STACK_FRAME_OVERHEAD
73 stg %r1,__SF_BACKCHAIN(%r15)
74 brasl %r14,ftrace_return_to_handler
75 aghi %r15,STACK_FRAME_OVERHEAD