1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h> 2 #include <linux/module.h>
3 3
4 #include <linux/mm.h> /* for handle_mm_fault() 4 #include <linux/mm.h> /* for handle_mm_fault() */
5 #include <linux/ftrace.h> 5 #include <linux/ftrace.h>
6 #include <linux/sched/stat.h> 6 #include <linux/sched/stat.h>
7 #ifndef CONFIG_ARM64 7 #ifndef CONFIG_ARM64
8 #include <asm/asm-offsets.h> 8 #include <asm/asm-offsets.h>
9 #endif 9 #endif
10 10
11 extern void my_direct_func(unsigned long ip); 11 extern void my_direct_func(unsigned long ip);
12 12
13 void my_direct_func(unsigned long ip) 13 void my_direct_func(unsigned long ip)
14 { 14 {
15 trace_printk("ip %lx\n", ip); 15 trace_printk("ip %lx\n", ip);
16 } 16 }
17 17
18 extern void my_tramp(void *); 18 extern void my_tramp(void *);
19 19
20 #ifdef CONFIG_RISCV 20 #ifdef CONFIG_RISCV
21 #include <asm/asm.h> 21 #include <asm/asm.h>
22 22
23 asm ( 23 asm (
24 " .pushsection .text, \"ax\", @progbi 24 " .pushsection .text, \"ax\", @progbits\n"
25 " .type my_tramp, @function\n" 25 " .type my_tramp, @function\n"
26 " .globl my_tramp\n" 26 " .globl my_tramp\n"
27 " my_tramp:\n" 27 " my_tramp:\n"
28 " addi sp,sp,-3*"SZREG"\n" 28 " addi sp,sp,-3*"SZREG"\n"
29 " "REG_S" a0,0*"SZREG"(sp)\n" 29 " "REG_S" a0,0*"SZREG"(sp)\n"
30 " "REG_S" t0,1*"SZREG"(sp)\n" 30 " "REG_S" t0,1*"SZREG"(sp)\n"
31 " "REG_S" ra,2*"SZREG"(sp)\n" 31 " "REG_S" ra,2*"SZREG"(sp)\n"
32 " mv a0,t0\n" 32 " mv a0,t0\n"
33 " call my_direct_func\n" 33 " call my_direct_func\n"
34 " "REG_L" a0,0*"SZREG"(sp)\n" 34 " "REG_L" a0,0*"SZREG"(sp)\n"
35 " "REG_L" t0,1*"SZREG"(sp)\n" 35 " "REG_L" t0,1*"SZREG"(sp)\n"
36 " "REG_L" ra,2*"SZREG"(sp)\n" 36 " "REG_L" ra,2*"SZREG"(sp)\n"
37 " addi sp,sp,3*"SZREG"\n" 37 " addi sp,sp,3*"SZREG"\n"
38 " jr t0\n" 38 " jr t0\n"
39 " .size my_tramp, .-my_tramp\n 39 " .size my_tramp, .-my_tramp\n"
40 " .popsection\n" 40 " .popsection\n"
41 ); 41 );
42 42
43 #endif /* CONFIG_RISCV */ 43 #endif /* CONFIG_RISCV */
44 44
45 #ifdef CONFIG_X86_64 45 #ifdef CONFIG_X86_64
46 46
47 #include <asm/ibt.h> 47 #include <asm/ibt.h>
48 #include <asm/nospec-branch.h> 48 #include <asm/nospec-branch.h>
49 49
50 asm ( 50 asm (
51 " .pushsection .text, \"ax\", @progbi 51 " .pushsection .text, \"ax\", @progbits\n"
52 " .type my_tramp, @function\n" 52 " .type my_tramp, @function\n"
53 " .globl my_tramp\n" 53 " .globl my_tramp\n"
54 " my_tramp:" 54 " my_tramp:"
55 ASM_ENDBR 55 ASM_ENDBR
56 " pushq %rbp\n" 56 " pushq %rbp\n"
57 " movq %rsp, %rbp\n" 57 " movq %rsp, %rbp\n"
58 CALL_DEPTH_ACCOUNT 58 CALL_DEPTH_ACCOUNT
59 " pushq %rdi\n" 59 " pushq %rdi\n"
60 " movq 8(%rbp), %rdi\n" 60 " movq 8(%rbp), %rdi\n"
61 " call my_direct_func\n" 61 " call my_direct_func\n"
62 " popq %rdi\n" 62 " popq %rdi\n"
63 " leave\n" 63 " leave\n"
64 ASM_RET 64 ASM_RET
65 " .size my_tramp, .-my_tramp\n 65 " .size my_tramp, .-my_tramp\n"
66 " .popsection\n" 66 " .popsection\n"
67 ); 67 );
68 68
69 #endif /* CONFIG_X86_64 */ 69 #endif /* CONFIG_X86_64 */
70 70
71 #ifdef CONFIG_S390 71 #ifdef CONFIG_S390
72 72
73 asm ( 73 asm (
74 " .pushsection .text, \"ax\", @progbi 74 " .pushsection .text, \"ax\", @progbits\n"
75 " .type my_tramp, @function\n" 75 " .type my_tramp, @function\n"
76 " .globl my_tramp\n" 76 " .globl my_tramp\n"
77 " my_tramp:" 77 " my_tramp:"
78 " lgr %r1,%r15\n" 78 " lgr %r1,%r15\n"
79 " stmg %r0,%r5,"__stringify(_ 79 " stmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
80 " stg %r14,"__stringify(__SF 80 " stg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
81 " aghi %r15,"__stringify(-STA 81 " aghi %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
82 " stg %r1,"__stringify(__SF_ 82 " stg %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
83 " lgr %r2,%r0\n" 83 " lgr %r2,%r0\n"
84 " brasl %r14,my_direct_func\n" 84 " brasl %r14,my_direct_func\n"
85 " aghi %r15,"__stringify(STAC 85 " aghi %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
86 " lmg %r0,%r5,"__stringify(_ 86 " lmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
87 " lg %r14,"__stringify(__SF 87 " lg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
88 " lgr %r1,%r0\n" 88 " lgr %r1,%r0\n"
89 " br %r1\n" 89 " br %r1\n"
90 " .size my_tramp, .-my_tramp\n 90 " .size my_tramp, .-my_tramp\n"
91 " .popsection\n" 91 " .popsection\n"
92 ); 92 );
93 93
94 #endif /* CONFIG_S390 */ 94 #endif /* CONFIG_S390 */
95 95
96 #ifdef CONFIG_ARM64 96 #ifdef CONFIG_ARM64
97 97
98 asm ( 98 asm (
99 " .pushsection .text, \"ax\", @progbi 99 " .pushsection .text, \"ax\", @progbits\n"
100 " .type my_tramp, @function\n" 100 " .type my_tramp, @function\n"
101 " .globl my_tramp\n" 101 " .globl my_tramp\n"
102 " my_tramp:" 102 " my_tramp:"
103 " hint 34\n" // bti c 103 " hint 34\n" // bti c
104 " sub sp, sp, #32\n" 104 " sub sp, sp, #32\n"
105 " stp x9, x30, [sp]\n" 105 " stp x9, x30, [sp]\n"
106 " str x0, [sp, #16]\n" 106 " str x0, [sp, #16]\n"
107 " mov x0, x30\n" 107 " mov x0, x30\n"
108 " bl my_direct_func\n" 108 " bl my_direct_func\n"
109 " ldp x30, x9, [sp]\n" 109 " ldp x30, x9, [sp]\n"
110 " ldr x0, [sp, #16]\n" 110 " ldr x0, [sp, #16]\n"
111 " add sp, sp, #32\n" 111 " add sp, sp, #32\n"
112 " ret x9\n" 112 " ret x9\n"
113 " .size my_tramp, .-my_tramp\n 113 " .size my_tramp, .-my_tramp\n"
114 " .popsection\n" 114 " .popsection\n"
115 ); 115 );
116 116
117 #endif /* CONFIG_ARM64 */ 117 #endif /* CONFIG_ARM64 */
118 118
119 #ifdef CONFIG_LOONGARCH 119 #ifdef CONFIG_LOONGARCH
120 120
121 #include <asm/asm.h> 121 #include <asm/asm.h>
122 asm ( 122 asm (
123 " .pushsection .text, \"ax\", @progbi 123 " .pushsection .text, \"ax\", @progbits\n"
124 " .type my_tramp, @function\n" 124 " .type my_tramp, @function\n"
125 " .globl my_tramp\n" 125 " .globl my_tramp\n"
126 " my_tramp:\n" 126 " my_tramp:\n"
127 " addi.d $sp, $sp, -32\n" 127 " addi.d $sp, $sp, -32\n"
128 " st.d $a0, $sp, 0\n" 128 " st.d $a0, $sp, 0\n"
129 " st.d $t0, $sp, 8\n" 129 " st.d $t0, $sp, 8\n"
130 " st.d $ra, $sp, 16\n" 130 " st.d $ra, $sp, 16\n"
131 " move $a0, $t0\n" 131 " move $a0, $t0\n"
132 " bl my_direct_func\n" 132 " bl my_direct_func\n"
133 " ld.d $a0, $sp, 0\n" 133 " ld.d $a0, $sp, 0\n"
134 " ld.d $t0, $sp, 8\n" 134 " ld.d $t0, $sp, 8\n"
135 " ld.d $ra, $sp, 16\n" 135 " ld.d $ra, $sp, 16\n"
136 " addi.d $sp, $sp, 32\n" 136 " addi.d $sp, $sp, 32\n"
137 " jr $t0\n" 137 " jr $t0\n"
138 " .size my_tramp, .-my_tramp\n 138 " .size my_tramp, .-my_tramp\n"
139 " .popsection\n" 139 " .popsection\n"
140 ); 140 );
141 141
142 #endif /* CONFIG_LOONGARCH */ 142 #endif /* CONFIG_LOONGARCH */
143 143
144 static struct ftrace_ops direct; 144 static struct ftrace_ops direct;
145 145
146 static int __init ftrace_direct_multi_init(voi 146 static int __init ftrace_direct_multi_init(void)
147 { 147 {
148 ftrace_set_filter_ip(&direct, (unsigne 148 ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0);
149 ftrace_set_filter_ip(&direct, (unsigne 149 ftrace_set_filter_ip(&direct, (unsigned long) schedule, 0, 0);
150 150
151 return register_ftrace_direct(&direct, 151 return register_ftrace_direct(&direct, (unsigned long) my_tramp);
152 } 152 }
153 153
154 static void __exit ftrace_direct_multi_exit(vo 154 static void __exit ftrace_direct_multi_exit(void)
155 { 155 {
156 unregister_ftrace_direct(&direct, (uns 156 unregister_ftrace_direct(&direct, (unsigned long) my_tramp, true);
157 } 157 }
158 158
159 module_init(ftrace_direct_multi_init); 159 module_init(ftrace_direct_multi_init);
160 module_exit(ftrace_direct_multi_exit); 160 module_exit(ftrace_direct_multi_exit);
161 161
162 MODULE_AUTHOR("Jiri Olsa"); 162 MODULE_AUTHOR("Jiri Olsa");
163 MODULE_DESCRIPTION("Example use case of using 163 MODULE_DESCRIPTION("Example use case of using register_ftrace_direct_multi()");
164 MODULE_LICENSE("GPL"); 164 MODULE_LICENSE("GPL");
165 165
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