1 #include "../builtins/assembly.h"
4 /* The variable containing the handler function pointer */
5 .global _ZN6__xray19XRayPatchedFunctionE
6 /* Word-aligned function entry point */
8 /* Let C/C++ see the symbol */
9 .global __xray_FunctionEntry
10 .hidden __xray_FunctionEntry
11 .type __xray_FunctionEntry, %function
12 /* In C++ it is void extern "C" __xray_FunctionEntry(uint32_t FuncId) with
13 FuncId passed in W0 register. */
15 /* Move the return address beyond the end of sled data. The 12 bytes of
16 data are inserted in the code of the runtime patch, between the call
17 instruction and the instruction returned into. The data contains 32
18 bits of instrumented function ID and 64 bits of the address of
19 the current trampoline. */
21 /* Push the registers which may be modified by the handler function */
22 STP X1, X2, [SP, #-16]!
23 STP X3, X4, [SP, #-16]!
24 STP X5, X6, [SP, #-16]!
25 STP X7, X30, [SP, #-16]!
26 STP Q0, Q1, [SP, #-32]!
27 STP Q2, Q3, [SP, #-32]!
28 STP Q4, Q5, [SP, #-32]!
29 STP Q6, Q7, [SP, #-32]!
30 /* X8 is the indirect result register and needs to be preserved for the body
31 of the function to use */
32 STP X8, X0, [SP, #-16]!
34 /* Load the page address of _ZN6__xray19XRayPatchedFunctionE into X1 */
35 ADRP X1, _ZN6__xray19XRayPatchedFunctionE
36 /* Load the handler function pointer into X2 */
37 LDR X2, [X1, #:lo12:_ZN6__xray19XRayPatchedFunctionE]
38 /* Handler address is nullptr if handler is not set */
40 BEQ FunctionEntry_restore
41 /* Function ID is already in W0 (the first parameter).
42 X1=0 means that we are tracing an entry event */
44 /* Call the handler with 2 parameters in W0 and X1 */
46 FunctionEntry_restore:
47 /* Pop the saved registers */
53 LDP X7, X30, [SP], #16
59 /* Word-aligned function entry point */
61 /* Let C/C++ see the symbol */
62 .global __xray_FunctionExit
63 .hidden __xray_FunctionExit
64 .type __xray_FunctionExit, %function
65 /* In C++ it is void extern "C" __xray_FunctionExit(uint32_t FuncId) with
66 FuncId passed in W0 register. */
68 /* Move the return address beyond the end of sled data. The 12 bytes of
69 data are inserted in the code of the runtime patch, between the call
70 instruction and the instruction returned into. The data contains 32
71 bits of instrumented function ID and 64 bits of the address of
72 the current trampoline. */
74 /* Push the registers which may be modified by the handler function */
75 STP X1, X2, [SP, #-16]!
76 STP X3, X4, [SP, #-16]!
77 STP X5, X6, [SP, #-16]!
78 STP X7, X30, [SP, #-16]!
79 STP Q0, Q1, [SP, #-32]!
80 STP Q2, Q3, [SP, #-32]!
81 STP Q4, Q5, [SP, #-32]!
82 STP Q6, Q7, [SP, #-32]!
83 /* X8 is the indirect result register and needs to be preserved for the body
84 of the function to use */
85 STP X8, X0, [SP, #-16]!
87 /* Load the page address of _ZN6__xray19XRayPatchedFunctionE into X1 */
88 ADRP X1, _ZN6__xray19XRayPatchedFunctionE
89 /* Load the handler function pointer into X2 */
90 LDR X2, [X1, #:lo12:_ZN6__xray19XRayPatchedFunctionE]
91 /* Handler address is nullptr if handler is not set */
93 BEQ FunctionExit_restore
94 /* Function ID is already in W0 (the first parameter).
95 X1=1 means that we are tracing an exit event */
97 /* Call the handler with 2 parameters in W0 and X1 */
100 LDP X8, X0, [SP], #16
101 LDP Q6, Q7, [SP], #32
102 LDP Q4, Q5, [SP], #32
103 LDP Q2, Q3, [SP], #32
104 LDP Q0, Q1, [SP], #32
105 LDP X7, X30, [SP], #16
106 LDP X5, X6, [SP], #16
107 LDP X3, X4, [SP], #16
108 LDP X1, X2, [SP], #16
111 /* Word-aligned function entry point */
113 /* Let C/C++ see the symbol */
114 .global __xray_FunctionTailExit
115 .hidden __xray_FunctionTailExit
116 .type __xray_FunctionTailExit, %function
117 /* In C++ it is void extern "C" __xray_FunctionTailExit(uint32_t FuncId)
118 with FuncId passed in W0 register. */
119 __xray_FunctionTailExit:
120 /* Move the return address beyond the end of sled data. The 12 bytes of
121 data are inserted in the code of the runtime patch, between the call
122 instruction and the instruction returned into. The data contains 32
123 bits of instrumented function ID and 64 bits of the address of
124 the current trampoline. */
126 /* Push the registers which may be modified by the handler function */
127 STP X1, X2, [SP, #-16]!
128 STP X3, X4, [SP, #-16]!
129 STP X5, X6, [SP, #-16]!
130 STP X7, X30, [SP, #-16]!
131 /* Push the parameters of the tail called function */
132 STP Q0, Q1, [SP, #-32]!
133 STP Q2, Q3, [SP, #-32]!
134 STP Q4, Q5, [SP, #-32]!
135 STP Q6, Q7, [SP, #-32]!
136 /* Load the page address of _ZN6__xray19XRayPatchedFunctionE into X1 */
137 ADRP X1, _ZN6__xray19XRayPatchedFunctionE
138 /* Load the handler function pointer into X2 */
139 LDR X2, [X1, #:lo12:_ZN6__xray19XRayPatchedFunctionE]
140 /* Handler address is nullptr if handler is not set */
142 BEQ FunctionTailExit_restore
143 /* Function ID is already in W0 (the first parameter).
144 X1=2 means that we are tracing a tail exit event, but before the
145 logging part of XRay is ready, we pretend that here a normal function
146 exit happens, so we give the handler code 1 */
148 /* Call the handler with 2 parameters in W0 and X1 */
150 FunctionTailExit_restore:
151 /* Pop the parameters of the tail called function */
152 LDP Q6, Q7, [SP], #32
153 LDP Q4, Q5, [SP], #32
154 LDP Q2, Q3, [SP], #32
155 LDP Q0, Q1, [SP], #32
156 /* Pop the registers which may be modified by the handler function */
157 LDP X7, X30, [SP], #16
158 LDP X5, X6, [SP], #16
159 LDP X3, X4, [SP], #16
160 LDP X1, X2, [SP], #16
163 NO_EXEC_STACK_DIRECTIVE