1 //===-- PlatformOpenBSD.cpp -----------------------------------------------===//
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 #include "PlatformOpenBSD.h"
10 #include "lldb/Host/Config.h"
11 
12 #include <cstdio>
13 #if LLDB_ENABLE_POSIX
14 #include <sys/utsname.h>
15 #endif
16 
17 #include "lldb/Core/Debugger.h"
18 #include "lldb/Core/PluginManager.h"
19 #include "lldb/Host/HostInfo.h"
20 #include "lldb/Target/Process.h"
21 #include "lldb/Target/Target.h"
22 #include "lldb/Utility/FileSpec.h"
23 #include "lldb/Utility/Log.h"
24 #include "lldb/Utility/State.h"
25 #include "lldb/Utility/Status.h"
26 #include "lldb/Utility/StreamString.h"
27 
28 // Define these constants from OpenBSD mman.h for use when targeting remote
29 // openbsd systems even when host has different values.
30 #define MAP_PRIVATE 0x0002
31 #define MAP_ANON 0x1000
32 
33 using namespace lldb;
34 using namespace lldb_private;
35 using namespace lldb_private::platform_openbsd;
36 
37 LLDB_PLUGIN_DEFINE(PlatformOpenBSD)
38 
39 static uint32_t g_initialize_count = 0;
40 
41 
42 PlatformSP PlatformOpenBSD::CreateInstance(bool force, const ArchSpec *arch) {
43   Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
44   LLDB_LOG(log, "force = {0}, arch=({1}, {2})", force,
45            arch ? arch->GetArchitectureName() : "<null>",
46            arch ? arch->GetTriple().getTriple() : "<null>");
47 
48   bool create = force;
49   if (!create && arch && arch->IsValid()) {
50     const llvm::Triple &triple = arch->GetTriple();
51     switch (triple.getOS()) {
52     case llvm::Triple::OpenBSD:
53       create = true;
54       break;
55 
56 #if defined(__OpenBSD__)
57     // Only accept "unknown" for the OS if the host is BSD and it "unknown"
58     // wasn't specified (it was just returned because it was NOT specified)
59     case llvm::Triple::OSType::UnknownOS:
60       create = !arch->TripleOSWasSpecified();
61       break;
62 #endif
63     default:
64       break;
65     }
66   }
67   LLDB_LOG(log, "create = {0}", create);
68   if (create) {
69     return PlatformSP(new PlatformOpenBSD(false));
70   }
71   return PlatformSP();
72 }
73 
74 ConstString PlatformOpenBSD::GetPluginNameStatic(bool is_host) {
75   if (is_host) {
76     static ConstString g_host_name(Platform::GetHostPlatformName());
77     return g_host_name;
78   } else {
79     static ConstString g_remote_name("remote-openbsd");
80     return g_remote_name;
81   }
82 }
83 
84 const char *PlatformOpenBSD::GetPluginDescriptionStatic(bool is_host) {
85   if (is_host)
86     return "Local OpenBSD user platform plug-in.";
87   else
88     return "Remote OpenBSD user platform plug-in.";
89 }
90 
91 void PlatformOpenBSD::Initialize() {
92   Platform::Initialize();
93 
94   if (g_initialize_count++ == 0) {
95 #if defined(__OpenBSD__)
96     PlatformSP default_platform_sp(new PlatformOpenBSD(true));
97     default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());
98     Platform::SetHostPlatform(default_platform_sp);
99 #endif
100     PluginManager::RegisterPlugin(
101         PlatformOpenBSD::GetPluginNameStatic(false),
102         PlatformOpenBSD::GetPluginDescriptionStatic(false),
103         PlatformOpenBSD::CreateInstance, nullptr);
104   }
105 }
106 
107 void PlatformOpenBSD::Terminate() {
108   if (g_initialize_count > 0) {
109     if (--g_initialize_count == 0) {
110       PluginManager::UnregisterPlugin(PlatformOpenBSD::CreateInstance);
111     }
112   }
113 
114   PlatformPOSIX::Terminate();
115 }
116 
117 /// Default Constructor
118 PlatformOpenBSD::PlatformOpenBSD(bool is_host)
119     : PlatformPOSIX(is_host) // This is the local host platform
120 {}
121 
122 bool PlatformOpenBSD::GetSupportedArchitectureAtIndex(uint32_t idx,
123                                                       ArchSpec &arch) {
124   if (IsHost()) {
125     ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
126     if (hostArch.GetTriple().isOSOpenBSD()) {
127       if (idx == 0) {
128         arch = hostArch;
129         return arch.IsValid();
130       }
131     }
132   } else {
133     if (m_remote_platform_sp)
134       return m_remote_platform_sp->GetSupportedArchitectureAtIndex(idx, arch);
135 
136     llvm::Triple triple;
137     // Set the OS to OpenBSD
138     triple.setOS(llvm::Triple::OpenBSD);
139     // Set the architecture
140     switch (idx) {
141     case 0:
142       triple.setArchName("x86_64");
143       break;
144     case 1:
145       triple.setArchName("i386");
146       break;
147     case 2:
148       triple.setArchName("aarch64");
149       break;
150     case 3:
151       triple.setArchName("arm");
152       break;
153     default:
154       return false;
155     }
156     // Leave the vendor as "llvm::Triple:UnknownVendor" and don't specify the
157     // vendor by calling triple.SetVendorName("unknown") so that it is a
158     // "unspecified unknown". This means when someone calls
159     // triple.GetVendorName() it will return an empty string which indicates
160     // that the vendor can be set when two architectures are merged
161 
162     // Now set the triple into "arch" and return true
163     arch.SetTriple(triple);
164     return true;
165   }
166   return false;
167 }
168 
169 void PlatformOpenBSD::GetStatus(Stream &strm) {
170   Platform::GetStatus(strm);
171 
172 #if LLDB_ENABLE_POSIX
173   // Display local kernel information only when we are running in host mode.
174   // Otherwise, we would end up printing non-OpenBSD information (when running
175   // on Mac OS for example).
176   if (IsHost()) {
177     struct utsname un;
178 
179     if (uname(&un))
180       return;
181 
182     strm.Printf("    Kernel: %s\n", un.sysname);
183     strm.Printf("   Release: %s\n", un.release);
184     strm.Printf("   Version: %s\n", un.version);
185   }
186 #endif
187 }
188 
189 // OpenBSD processes cannot yet be launched by spawning and attaching.
190 bool PlatformOpenBSD::CanDebugProcess() {
191   return false;
192 }
193 
194 void PlatformOpenBSD::CalculateTrapHandlerSymbolNames() {
195   m_trap_handlers.push_back(ConstString("_sigtramp"));
196 }
197 
198 MmapArgList PlatformOpenBSD::GetMmapArgumentList(const ArchSpec &arch,
199                                                  addr_t addr, addr_t length,
200                                                  unsigned prot, unsigned flags,
201                                                  addr_t fd, addr_t offset) {
202   uint64_t flags_platform = 0;
203 
204   if (flags & eMmapFlagsPrivate)
205     flags_platform |= MAP_PRIVATE;
206   if (flags & eMmapFlagsAnon)
207     flags_platform |= MAP_ANON;
208 
209   MmapArgList args({addr, length, prot, flags_platform, fd, offset});
210   return args;
211 }
212