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/nospec-insn.h>
12 #include <asm/ptrace.h>
13 #include <asm/export.h>
18 .section .kprobes.text, "ax"
23 #define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
24 #define STACK_PTREGS (STACK_FRAME_OVERHEAD)
25 #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
26 #define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
28 /* allocate just enough for r14, r15 and backchain */
29 #define TRACED_FUNC_FRAME_SIZE 24
31 #define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
37 EXPORT_SYMBOL(_mcount)
40 .globl ftrace_regs_caller
41 .set ftrace_regs_caller,ftrace_caller
42 stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
44 #ifndef CC_USING_HOTPATCH
45 aghi %r0,MCOUNT_RETURN_FIXUP
47 # allocate stack frame for ftrace_caller to contain traced function
48 aghi %r15,-TRACED_FUNC_FRAME_SIZE
49 stg %r1,__SF_BACKCHAIN(%r15)
50 stg %r0,(__SF_GPRS+8*8)(%r15)
51 stg %r15,(__SF_GPRS+9*8)(%r15)
52 # allocate pt_regs and stack frame for ftrace_trace_function
53 aghi %r15,-STACK_FRAME_SIZE
54 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
55 aghi %r1,-TRACED_FUNC_FRAME_SIZE
56 stg %r1,__SF_BACKCHAIN(%r15)
57 stg %r0,(STACK_PTREGS_PSW+8)(%r15)
58 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
59 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
60 aghik %r2,%r0,-MCOUNT_INSN_SIZE
61 lgrl %r4,function_trace_op
65 aghi %r2,-MCOUNT_INSN_SIZE
66 larl %r4,function_trace_op
72 la %r5,STACK_PTREGS(%r15)
74 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
75 # The j instruction gets runtime patched to a nop instruction.
76 # See ftrace_enable_ftrace_graph_caller.
77 ENTRY(ftrace_graph_caller)
78 j ftrace_graph_caller_end
79 lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
80 lg %r3,(STACK_PTREGS_PSW+8)(%r15)
81 brasl %r14,prepare_ftrace_return
82 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
83 ftrace_graph_caller_end:
84 .globl ftrace_graph_caller_end
86 lg %r1,(STACK_PTREGS_PSW+8)(%r15)
87 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
90 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
92 ENTRY(return_to_handler)
95 aghi %r15,-STACK_FRAME_OVERHEAD
96 stg %r1,__SF_BACKCHAIN(%r15)
97 brasl %r14,ftrace_return_to_handler
98 aghi %r15,STACK_FRAME_OVERHEAD