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