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