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 %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
41 aghi %r2,-MCOUNT_INSN_SIZE
42 larl %r4,function_trace_op
44 larl %r1,ftrace_trace_function
48 la %r5,STACK_PTREGS(%r15)
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
62 lg %r1,(STACK_PTREGS_PSW+8)(%r15)
63 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
66 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
68 ENTRY(return_to_handler)
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