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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2008, 2009
4 *
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6 *
7 */
8
9#include <linux/linkage.h>
10#include <asm/asm-offsets.h>
11#include <asm/ftrace.h>
12#include <asm/nospec-insn.h>
13#include <asm/ptrace.h>
14#include <asm/export.h>
15
16 GEN_BR_THUNK %r1
17 GEN_BR_THUNK %r14
18
19 .section .kprobes.text, "ax"
20
21ENTRY(ftrace_stub)
22 BR_EX %r14
23ENDPROC(ftrace_stub)
24
25#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
26#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
27#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
28#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
29
30ENTRY(_mcount)
31 BR_EX %r14
32ENDPROC(_mcount)
33EXPORT_SYMBOL(_mcount)
34
35ENTRY(ftrace_caller)
36 .globl ftrace_regs_caller
37 .set ftrace_regs_caller,ftrace_caller
38 lgr %r1,%r15
39#if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
40 aghi %r0,MCOUNT_RETURN_FIXUP
41#endif
42 aghi %r15,-STACK_FRAME_SIZE
43 stg %r1,__SF_BACKCHAIN(%r15)
44 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
45 stg %r0,(STACK_PTREGS_PSW+8)(%r15)
46 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
47#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
48 aghik %r2,%r0,-MCOUNT_INSN_SIZE
49 lgrl %r4,function_trace_op
50 lgrl %r1,ftrace_trace_function
51#else
52 lgr %r2,%r0
53 aghi %r2,-MCOUNT_INSN_SIZE
54 larl %r4,function_trace_op
55 lg %r4,0(%r4)
56 larl %r1,ftrace_trace_function
57 lg %r1,0(%r1)
58#endif
59 lgr %r3,%r14
60 la %r5,STACK_PTREGS(%r15)
61 BASR_EX %r14,%r1
62#ifdef CONFIG_FUNCTION_GRAPH_TRACER
63# The j instruction gets runtime patched to a nop instruction.
64# See ftrace_enable_ftrace_graph_caller.
65 .globl ftrace_graph_caller
66ftrace_graph_caller:
67 j ftrace_graph_caller_end
68 lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
69 lg %r4,(STACK_PTREGS_PSW+8)(%r15)
70 brasl %r14,prepare_ftrace_return
71 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
72ftrace_graph_caller_end:
73 .globl ftrace_graph_caller_end
74#endif
75 lg %r1,(STACK_PTREGS_PSW+8)(%r15)
76 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
77 BR_EX %r1
78ENDPROC(ftrace_caller)
79
80#ifdef CONFIG_FUNCTION_GRAPH_TRACER
81
82ENTRY(return_to_handler)
83 stmg %r2,%r5,32(%r15)
84 lgr %r1,%r15
85 aghi %r15,-STACK_FRAME_OVERHEAD
86 stg %r1,__SF_BACKCHAIN(%r15)
87 brasl %r14,ftrace_return_to_handler
88 aghi %r15,STACK_FRAME_OVERHEAD
89 lgr %r14,%r2
90 lmg %r2,%r5,32(%r15)
91 BR_EX %r14
92ENDPROC(return_to_handler)
93
94#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2008, 2009
4 *
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6 *
7 */
8
9#include <linux/linkage.h>
10#include <asm/asm-offsets.h>
11#include <asm/ftrace.h>
12#include <asm/nospec-insn.h>
13#include <asm/ptrace.h>
14#include <asm/export.h>
15
16 GEN_BR_THUNK %r1
17 GEN_BR_THUNK %r14
18
19 .section .kprobes.text, "ax"
20
21ENTRY(ftrace_stub)
22 BR_EX %r14
23ENDPROC(ftrace_stub)
24
25#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
26#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
27#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
28#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
29#ifdef __PACK_STACK
30/* allocate just enough for r14, r15 and backchain */
31#define TRACED_FUNC_FRAME_SIZE 24
32#else
33#define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
34#endif
35
36ENTRY(_mcount)
37 BR_EX %r14
38ENDPROC(_mcount)
39EXPORT_SYMBOL(_mcount)
40
41ENTRY(ftrace_caller)
42 .globl ftrace_regs_caller
43 .set ftrace_regs_caller,ftrace_caller
44 stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
45 lghi %r14,0 # save condition code
46 ipm %r14 # don't put any instructions
47 sllg %r14,%r14,16 # clobbering CC before this point
48 lgr %r1,%r15
49#if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
50 aghi %r0,MCOUNT_RETURN_FIXUP
51#endif
52 # allocate stack frame for ftrace_caller to contain traced function
53 aghi %r15,-TRACED_FUNC_FRAME_SIZE
54 stg %r1,__SF_BACKCHAIN(%r15)
55 stg %r0,(__SF_GPRS+8*8)(%r15)
56 stg %r15,(__SF_GPRS+9*8)(%r15)
57 # allocate pt_regs and stack frame for ftrace_trace_function
58 aghi %r15,-STACK_FRAME_SIZE
59 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
60 stg %r14,(STACK_PTREGS_PSW)(%r15)
61 lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
62 stosm (STACK_PTREGS_PSW)(%r15),0
63 aghi %r1,-TRACED_FUNC_FRAME_SIZE
64 stg %r1,__SF_BACKCHAIN(%r15)
65 stg %r0,(STACK_PTREGS_PSW+8)(%r15)
66 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
67#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
68 aghik %r2,%r0,-MCOUNT_INSN_SIZE
69 lgrl %r4,function_trace_op
70 lgrl %r1,ftrace_trace_function
71#else
72 lgr %r2,%r0
73 aghi %r2,-MCOUNT_INSN_SIZE
74 larl %r4,function_trace_op
75 lg %r4,0(%r4)
76 larl %r1,ftrace_trace_function
77 lg %r1,0(%r1)
78#endif
79 lgr %r3,%r14
80 la %r5,STACK_PTREGS(%r15)
81 BASR_EX %r14,%r1
82#ifdef CONFIG_FUNCTION_GRAPH_TRACER
83# The j instruction gets runtime patched to a nop instruction.
84# See ftrace_enable_ftrace_graph_caller.
85 .globl ftrace_graph_caller
86ftrace_graph_caller:
87 j ftrace_graph_caller_end
88 lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
89 lg %r4,(STACK_PTREGS_PSW+8)(%r15)
90 brasl %r14,prepare_ftrace_return
91 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
92ftrace_graph_caller_end:
93 .globl ftrace_graph_caller_end
94#endif
95 lg %r1,(STACK_PTREGS_PSW+8)(%r15)
96 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
97 BR_EX %r1
98ENDPROC(ftrace_caller)
99
100#ifdef CONFIG_FUNCTION_GRAPH_TRACER
101
102ENTRY(return_to_handler)
103 stmg %r2,%r5,32(%r15)
104 lgr %r1,%r15
105 aghi %r15,-STACK_FRAME_OVERHEAD
106 stg %r1,__SF_BACKCHAIN(%r15)
107 brasl %r14,ftrace_return_to_handler
108 aghi %r15,STACK_FRAME_OVERHEAD
109 lgr %r14,%r2
110 lmg %r2,%r5,32(%r15)
111 BR_EX %r14
112ENDPROC(return_to_handler)
113
114#endif