1 //===-- xray_powerpc64.cpp --------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of XRay, a dynamic runtime instrumentation system.
10 //
11 // Implementation of powerpc64 and powerpc64le routines.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "sanitizer_common/sanitizer_common.h"
15 #include "xray_defs.h"
16 #include "xray_interface_internal.h"
17 #include "xray_utils.h"
18 #include <atomic>
19 #include <cassert>
20 #include <cstring>
21
22 #ifndef __LITTLE_ENDIAN__
23 #error powerpc64 big endian is not supported for now.
24 #endif
25
26 namespace {
27
28 constexpr unsigned long long JumpOverInstNum = 7;
29
clearCache(void * Addr,size_t Len)30 void clearCache(void *Addr, size_t Len) {
31 const size_t LineSize = 32;
32
33 const intptr_t Mask = ~(LineSize - 1);
34 const intptr_t StartLine = ((intptr_t)Addr) & Mask;
35 const intptr_t EndLine = ((intptr_t)Addr + Len + LineSize - 1) & Mask;
36
37 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
38 asm volatile("dcbf 0, %0" : : "r"(Line));
39 asm volatile("sync");
40
41 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
42 asm volatile("icbi 0, %0" : : "r"(Line));
43 asm volatile("isync");
44 }
45
46 } // namespace
47
48 extern "C" void __clear_cache(void *start, void *end);
49
50 namespace __xray {
51
patchFunctionEntry(const bool Enable,uint32_t FuncId,const XRaySledEntry & Sled,void (* Trampoline)())52 bool patchFunctionEntry(const bool Enable, uint32_t FuncId,
53 const XRaySledEntry &Sled,
54 void (*Trampoline)()) XRAY_NEVER_INSTRUMENT {
55 const uint64_t Address = Sled.address();
56 if (Enable) {
57 // lis 0, FuncId[16..32]
58 // li 0, FuncId[0..15]
59 *reinterpret_cast<uint64_t *>(Address) =
60 (0x3c000000ull + (FuncId >> 16)) +
61 ((0x60000000ull + (FuncId & 0xffff)) << 32);
62 } else {
63 // b +JumpOverInstNum instructions.
64 *reinterpret_cast<uint32_t *>(Address) =
65 0x48000000ull + (JumpOverInstNum << 2);
66 }
67 clearCache(reinterpret_cast<void *>(Address), 8);
68 return true;
69 }
70
patchFunctionExit(const bool Enable,uint32_t FuncId,const XRaySledEntry & Sled)71 bool patchFunctionExit(const bool Enable, uint32_t FuncId,
72 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
73 const uint64_t Address = Sled.address();
74 if (Enable) {
75 // lis 0, FuncId[16..32]
76 // li 0, FuncId[0..15]
77 *reinterpret_cast<uint64_t *>(Address) =
78 (0x3c000000ull + (FuncId >> 16)) +
79 ((0x60000000ull + (FuncId & 0xffff)) << 32);
80 } else {
81 // Copy the blr/b instruction after JumpOverInstNum instructions.
82 *reinterpret_cast<uint32_t *>(Address) =
83 *(reinterpret_cast<uint32_t *>(Address) + JumpOverInstNum);
84 }
85 clearCache(reinterpret_cast<void *>(Address), 8);
86 return true;
87 }
88
patchFunctionTailExit(const bool Enable,const uint32_t FuncId,const XRaySledEntry & Sled)89 bool patchFunctionTailExit(const bool Enable, const uint32_t FuncId,
90 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
91 return patchFunctionExit(Enable, FuncId, Sled);
92 }
93
94 // FIXME: Maybe implement this better?
probeRequiredCPUFeatures()95 bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
96
patchCustomEvent(const bool Enable,const uint32_t FuncId,const XRaySledEntry & Sled)97 bool patchCustomEvent(const bool Enable, const uint32_t FuncId,
98 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
99 // FIXME: Implement in powerpc64?
100 return false;
101 }
102
patchTypedEvent(const bool Enable,const uint32_t FuncId,const XRaySledEntry & Sled)103 bool patchTypedEvent(const bool Enable, const uint32_t FuncId,
104 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
105 // FIXME: Implement in powerpc64?
106 return false;
107 }
108
109 } // namespace __xray
110
__xray_ArgLoggerEntry()111 extern "C" void __xray_ArgLoggerEntry() XRAY_NEVER_INSTRUMENT {
112 // FIXME: this will have to be implemented in the trampoline assembly file
113 }
114