1/*
2 * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
3 * Copyright (c) 2012 ARM Limited
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2001-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Nathan Binkert
42 * Steve Reinhardt
43 * Ali Saidi
44 * Brandon Potter
45 */
46
47#include "sim/process.hh"
48
49#include <fcntl.h>
50#include <unistd.h>
51
52#include <array>
53#include <csignal>
54#include <map>
55#include <string>
56#include <vector>
57
58#include "base/intmath.hh"
59#include "base/loader/object_file.hh"
60#include "base/loader/symtab.hh"
61#include "base/statistics.hh"
62#include "config/the_isa.hh"
63#include "cpu/thread_context.hh"
64#include "mem/page_table.hh"
65#include "mem/se_translating_port_proxy.hh"
66#include "params/Process.hh"
67#include "sim/emul_driver.hh"
68#include "sim/fd_array.hh"
69#include "sim/fd_entry.hh"
70#include "sim/syscall_desc.hh"
71#include "sim/system.hh"
72
73#if THE_ISA == ALPHA_ISA
74#include "arch/alpha/linux/process.hh"
75
76#elif THE_ISA == SPARC_ISA
77#include "arch/sparc/linux/process.hh"
78#include "arch/sparc/solaris/process.hh"
79
80#elif THE_ISA == MIPS_ISA
81#include "arch/mips/linux/process.hh"
82
83#elif THE_ISA == ARM_ISA
84#include "arch/arm/freebsd/process.hh"
85#include "arch/arm/linux/process.hh"
86
87#elif THE_ISA == X86_ISA
88#include "arch/x86/linux/process.hh"
89
90#elif THE_ISA == POWER_ISA
91#include "arch/power/linux/process.hh"
92
93#elif THE_ISA == RISCV_ISA
94#include "arch/riscv/linux/process.hh"
95
96#else
97#error "THE_ISA not set"
98#endif
99
100
101using namespace std;
102using namespace TheISA;
103
104Process::Process(ProcessParams * params, ObjectFile * obj_file)
105 : SimObject(params), system(params->system),
106 useArchPT(params->useArchPT),
107 kvmInSE(params->kvmInSE),
108 pTable(useArchPT ?
109 static_cast<PageTableBase *>(new ArchPageTable(name(), params->pid,
110 system)) :
111 static_cast<PageTableBase *>(new FuncPageTable(name(), params->pid))),
112 initVirtMem(system->getSystemPort(), this,
113 SETranslatingPortProxy::Always),
114 objFile(obj_file),
115 argv(params->cmd), envp(params->env), cwd(params->cwd),
116 executable(params->executable),
117 _uid(params->uid), _euid(params->euid),
118 _gid(params->gid), _egid(params->egid),
119 _pid(params->pid), _ppid(params->ppid),
120 _pgid(params->pgid), drivers(params->drivers),
121 fds(make_shared<FDArray>(params->input, params->output, params->errout)),
122 childClearTID(0)
123{
124 if (_pid >= System::maxPID)
125 fatal("_pid is too large: %d", _pid);
126
127 auto ret_pair = system->PIDs.emplace(_pid);
128 if (!ret_pair.second)
129 fatal("_pid %d is already used", _pid);
130
131 /**
132 * Linux bundles together processes into this concept called a thread
133 * group. The thread group is responsible for recording which processes
134 * behave as threads within a process context. The thread group leader
135 * is the process who's tgid is equal to its pid. Other processes which
136 * belong to the thread group, but do not lead the thread group, are
137 * treated as child threads. These threads are created by the clone system
138 * call with options specified to create threads (differing from the
139 * options used to implement a fork). By default, set up the tgid/pid
140 * with a new, equivalent value. If CLONE_THREAD is specified, patch
141 * the tgid value with the old process' value.
142 */
143 _tgid = params->pid;
144
145 exitGroup = new bool();
146 sigchld = new bool();
147
148 if (!debugSymbolTable) {
149 debugSymbolTable = new SymbolTable();
150 if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
151 !objFile->loadLocalSymbols(debugSymbolTable) ||
152 !objFile->loadWeakSymbols(debugSymbolTable)) {
153 delete debugSymbolTable;
154 debugSymbolTable = nullptr;
155 }
156 }
157}
158
159void
160Process::clone(ThreadContext *otc, ThreadContext *ntc,
161 Process *np, TheISA::IntReg flags)
162{
163#ifndef CLONE_VM
164#define CLONE_VM 0
165#endif
166#ifndef CLONE_FILES
167#define CLONE_FILES 0
168#endif
169#ifndef CLONE_THREAD
170#define CLONE_THREAD 0
171#endif
172 if (CLONE_VM & flags) {
173 /**
174 * Share the process memory address space between the new process
175 * and the old process. Changes in one will be visible in the other
176 * due to the pointer use.
177 */
178 delete np->pTable;
179 np->pTable = pTable;
180 ntc->getMemProxy().setPageTable(np->pTable);
181
182 np->memState = memState;
183 } else {
184 /**
185 * Duplicate the process memory address space. The state needs to be
186 * copied over (rather than using pointers to share everything).
187 */
188 typedef std::vector<pair<Addr,Addr>> MapVec;
189 MapVec mappings;
190 pTable->getMappings(&mappings);
191
192 for (auto map : mappings) {
193 Addr paddr, vaddr = map.first;
194 bool alloc_page = !(np->pTable->translate(vaddr, paddr));
195 np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
196 }
197
198 *np->memState = *memState;
199 }
200
201 if (CLONE_FILES & flags) {
202 /**
203 * The parent and child file descriptors are shared because the
204 * two FDArray pointers are pointing to the same FDArray. Opening
205 * and closing file descriptors will be visible to both processes.
206 */
207 np->fds = fds;
208 } else {
209 /**
210 * Copy the file descriptors from the old process into the new
211 * child process. The file descriptors entry can be opened and
212 * closed independently of the other process being considered. The
213 * host file descriptors are also dup'd so that the flags for the
214 * host file descriptor is independent of the other process.
215 */
216 for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
217 std::shared_ptr<FDArray> nfds = np->fds;
218 std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
219 if (!this_fde) {
220 nfds->setFDEntry(tgt_fd, nullptr);
221 continue;
222 }
223 nfds->setFDEntry(tgt_fd, this_fde->clone());
224
225 auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
226 if (!this_hbfd)
227 continue;
228
229 int this_sim_fd = this_hbfd->getSimFD();
230 if (this_sim_fd <= 2)
231 continue;
232
233 int np_sim_fd = dup(this_sim_fd);
234 assert(np_sim_fd != -1);
235
236 auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
237 nhbfd->setSimFD(np_sim_fd);
238 }
239 }
240
241 if (CLONE_THREAD & flags) {
242 np->_tgid = _tgid;
243 delete np->exitGroup;
244 np->exitGroup = exitGroup;
245 }
246
247 np->argv.insert(np->argv.end(), argv.begin(), argv.end());
248 np->envp.insert(np->envp.end(), envp.begin(), envp.end());
249}
250
251void
252Process::regStats()
253{
254 SimObject::regStats();
255
256 using namespace Stats;
257
258 numSyscalls
259 .name(name() + ".numSyscalls")
260 .desc("Number of system calls")
261 ;
262}
263
264ThreadContext *
265Process::findFreeContext()
266{
267 for (auto &it : system->threadContexts) {
268 if (ThreadContext::Halted == it->status())
269 return it;
270 }
271 return nullptr;
272}
273
274void
275Process::revokeThreadContext(int context_id)
276{
277 std::vector<ContextID>::iterator it;
278 for (it = contextIds.begin(); it != contextIds.end(); it++) {
279 if (*it == context_id) {
280 contextIds.erase(it);
281 return;
282 }
283 }
284 warn("Unable to find thread context to revoke");
285}
286
287void
288Process::initState()
289{
290 if (contextIds.empty())
291 fatal("Process %s is not associated with any HW contexts!\n", name());
292
293 // first thread context for this process... initialize & enable
294 ThreadContext *tc = system->getThreadContext(contextIds[0]);
295
296 // mark this context as active so it will start ticking.
297 tc->activate();
298
299 pTable->initState(tc);
300}
301
302DrainState
303Process::drain()
304{
305 fds->updateFileOffsets();
306 return DrainState::Drained;
307}
308
309void
310Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
311{
312 int npages = divCeil(size, (int64_t)PageBytes);
313 Addr paddr = system->allocPhysPages(npages);
314 pTable->map(vaddr, paddr, size,
315 clobber ? PageTableBase::Clobber : PageTableBase::Zero);
316}
317
318void
319Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
320 ThreadContext *new_tc, bool allocate_page)
321{
322 if (allocate_page)
323 new_paddr = system->allocPhysPages(1);
324
325 // Read from old physical page.
326 uint8_t *buf_p = new uint8_t[PageBytes];
327 old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
328
329 // Create new mapping in process address space by clobbering existing
330 // mapping (if any existed) and then write to the new physical page.
331 bool clobber = true;
332 pTable->map(vaddr, new_paddr, PageBytes, clobber);
333 new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
334 delete[] buf_p;
335}
336
337bool
338Process::fixupStackFault(Addr vaddr)
339{
340 Addr stack_min = memState->getStackMin();
341 Addr stack_base = memState->getStackBase();
342 Addr max_stack_size = memState->getMaxStackSize();
343
344 // Check if this is already on the stack and there's just no page there
345 // yet.
346 if (vaddr >= stack_min && vaddr < stack_base) {
347 allocateMem(roundDown(vaddr, PageBytes), PageBytes);
348 return true;
349 }
350
351 // We've accessed the next page of the stack, so extend it to include
352 // this address.
353 if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) {
354 while (vaddr < stack_min) {
355 stack_min -= TheISA::PageBytes;
356 if (stack_base - stack_min > max_stack_size)
357 fatal("Maximum stack size exceeded\n");
358 allocateMem(stack_min, TheISA::PageBytes);
359 inform("Increasing stack size by one page.");
360 }
361 memState->setStackMin(stack_min);
362 return true;
363 }
364 return false;
365}
366
367void
368Process::serialize(CheckpointOut &cp) const
369{
| 1/*
2 * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
3 * Copyright (c) 2012 ARM Limited
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder. You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2001-2005 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Nathan Binkert
42 * Steve Reinhardt
43 * Ali Saidi
44 * Brandon Potter
45 */
46
47#include "sim/process.hh"
48
49#include <fcntl.h>
50#include <unistd.h>
51
52#include <array>
53#include <csignal>
54#include <map>
55#include <string>
56#include <vector>
57
58#include "base/intmath.hh"
59#include "base/loader/object_file.hh"
60#include "base/loader/symtab.hh"
61#include "base/statistics.hh"
62#include "config/the_isa.hh"
63#include "cpu/thread_context.hh"
64#include "mem/page_table.hh"
65#include "mem/se_translating_port_proxy.hh"
66#include "params/Process.hh"
67#include "sim/emul_driver.hh"
68#include "sim/fd_array.hh"
69#include "sim/fd_entry.hh"
70#include "sim/syscall_desc.hh"
71#include "sim/system.hh"
72
73#if THE_ISA == ALPHA_ISA
74#include "arch/alpha/linux/process.hh"
75
76#elif THE_ISA == SPARC_ISA
77#include "arch/sparc/linux/process.hh"
78#include "arch/sparc/solaris/process.hh"
79
80#elif THE_ISA == MIPS_ISA
81#include "arch/mips/linux/process.hh"
82
83#elif THE_ISA == ARM_ISA
84#include "arch/arm/freebsd/process.hh"
85#include "arch/arm/linux/process.hh"
86
87#elif THE_ISA == X86_ISA
88#include "arch/x86/linux/process.hh"
89
90#elif THE_ISA == POWER_ISA
91#include "arch/power/linux/process.hh"
92
93#elif THE_ISA == RISCV_ISA
94#include "arch/riscv/linux/process.hh"
95
96#else
97#error "THE_ISA not set"
98#endif
99
100
101using namespace std;
102using namespace TheISA;
103
104Process::Process(ProcessParams * params, ObjectFile * obj_file)
105 : SimObject(params), system(params->system),
106 useArchPT(params->useArchPT),
107 kvmInSE(params->kvmInSE),
108 pTable(useArchPT ?
109 static_cast<PageTableBase *>(new ArchPageTable(name(), params->pid,
110 system)) :
111 static_cast<PageTableBase *>(new FuncPageTable(name(), params->pid))),
112 initVirtMem(system->getSystemPort(), this,
113 SETranslatingPortProxy::Always),
114 objFile(obj_file),
115 argv(params->cmd), envp(params->env), cwd(params->cwd),
116 executable(params->executable),
117 _uid(params->uid), _euid(params->euid),
118 _gid(params->gid), _egid(params->egid),
119 _pid(params->pid), _ppid(params->ppid),
120 _pgid(params->pgid), drivers(params->drivers),
121 fds(make_shared<FDArray>(params->input, params->output, params->errout)),
122 childClearTID(0)
123{
124 if (_pid >= System::maxPID)
125 fatal("_pid is too large: %d", _pid);
126
127 auto ret_pair = system->PIDs.emplace(_pid);
128 if (!ret_pair.second)
129 fatal("_pid %d is already used", _pid);
130
131 /**
132 * Linux bundles together processes into this concept called a thread
133 * group. The thread group is responsible for recording which processes
134 * behave as threads within a process context. The thread group leader
135 * is the process who's tgid is equal to its pid. Other processes which
136 * belong to the thread group, but do not lead the thread group, are
137 * treated as child threads. These threads are created by the clone system
138 * call with options specified to create threads (differing from the
139 * options used to implement a fork). By default, set up the tgid/pid
140 * with a new, equivalent value. If CLONE_THREAD is specified, patch
141 * the tgid value with the old process' value.
142 */
143 _tgid = params->pid;
144
145 exitGroup = new bool();
146 sigchld = new bool();
147
148 if (!debugSymbolTable) {
149 debugSymbolTable = new SymbolTable();
150 if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
151 !objFile->loadLocalSymbols(debugSymbolTable) ||
152 !objFile->loadWeakSymbols(debugSymbolTable)) {
153 delete debugSymbolTable;
154 debugSymbolTable = nullptr;
155 }
156 }
157}
158
159void
160Process::clone(ThreadContext *otc, ThreadContext *ntc,
161 Process *np, TheISA::IntReg flags)
162{
163#ifndef CLONE_VM
164#define CLONE_VM 0
165#endif
166#ifndef CLONE_FILES
167#define CLONE_FILES 0
168#endif
169#ifndef CLONE_THREAD
170#define CLONE_THREAD 0
171#endif
172 if (CLONE_VM & flags) {
173 /**
174 * Share the process memory address space between the new process
175 * and the old process. Changes in one will be visible in the other
176 * due to the pointer use.
177 */
178 delete np->pTable;
179 np->pTable = pTable;
180 ntc->getMemProxy().setPageTable(np->pTable);
181
182 np->memState = memState;
183 } else {
184 /**
185 * Duplicate the process memory address space. The state needs to be
186 * copied over (rather than using pointers to share everything).
187 */
188 typedef std::vector<pair<Addr,Addr>> MapVec;
189 MapVec mappings;
190 pTable->getMappings(&mappings);
191
192 for (auto map : mappings) {
193 Addr paddr, vaddr = map.first;
194 bool alloc_page = !(np->pTable->translate(vaddr, paddr));
195 np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
196 }
197
198 *np->memState = *memState;
199 }
200
201 if (CLONE_FILES & flags) {
202 /**
203 * The parent and child file descriptors are shared because the
204 * two FDArray pointers are pointing to the same FDArray. Opening
205 * and closing file descriptors will be visible to both processes.
206 */
207 np->fds = fds;
208 } else {
209 /**
210 * Copy the file descriptors from the old process into the new
211 * child process. The file descriptors entry can be opened and
212 * closed independently of the other process being considered. The
213 * host file descriptors are also dup'd so that the flags for the
214 * host file descriptor is independent of the other process.
215 */
216 for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
217 std::shared_ptr<FDArray> nfds = np->fds;
218 std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
219 if (!this_fde) {
220 nfds->setFDEntry(tgt_fd, nullptr);
221 continue;
222 }
223 nfds->setFDEntry(tgt_fd, this_fde->clone());
224
225 auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
226 if (!this_hbfd)
227 continue;
228
229 int this_sim_fd = this_hbfd->getSimFD();
230 if (this_sim_fd <= 2)
231 continue;
232
233 int np_sim_fd = dup(this_sim_fd);
234 assert(np_sim_fd != -1);
235
236 auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
237 nhbfd->setSimFD(np_sim_fd);
238 }
239 }
240
241 if (CLONE_THREAD & flags) {
242 np->_tgid = _tgid;
243 delete np->exitGroup;
244 np->exitGroup = exitGroup;
245 }
246
247 np->argv.insert(np->argv.end(), argv.begin(), argv.end());
248 np->envp.insert(np->envp.end(), envp.begin(), envp.end());
249}
250
251void
252Process::regStats()
253{
254 SimObject::regStats();
255
256 using namespace Stats;
257
258 numSyscalls
259 .name(name() + ".numSyscalls")
260 .desc("Number of system calls")
261 ;
262}
263
264ThreadContext *
265Process::findFreeContext()
266{
267 for (auto &it : system->threadContexts) {
268 if (ThreadContext::Halted == it->status())
269 return it;
270 }
271 return nullptr;
272}
273
274void
275Process::revokeThreadContext(int context_id)
276{
277 std::vector<ContextID>::iterator it;
278 for (it = contextIds.begin(); it != contextIds.end(); it++) {
279 if (*it == context_id) {
280 contextIds.erase(it);
281 return;
282 }
283 }
284 warn("Unable to find thread context to revoke");
285}
286
287void
288Process::initState()
289{
290 if (contextIds.empty())
291 fatal("Process %s is not associated with any HW contexts!\n", name());
292
293 // first thread context for this process... initialize & enable
294 ThreadContext *tc = system->getThreadContext(contextIds[0]);
295
296 // mark this context as active so it will start ticking.
297 tc->activate();
298
299 pTable->initState(tc);
300}
301
302DrainState
303Process::drain()
304{
305 fds->updateFileOffsets();
306 return DrainState::Drained;
307}
308
309void
310Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
311{
312 int npages = divCeil(size, (int64_t)PageBytes);
313 Addr paddr = system->allocPhysPages(npages);
314 pTable->map(vaddr, paddr, size,
315 clobber ? PageTableBase::Clobber : PageTableBase::Zero);
316}
317
318void
319Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
320 ThreadContext *new_tc, bool allocate_page)
321{
322 if (allocate_page)
323 new_paddr = system->allocPhysPages(1);
324
325 // Read from old physical page.
326 uint8_t *buf_p = new uint8_t[PageBytes];
327 old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
328
329 // Create new mapping in process address space by clobbering existing
330 // mapping (if any existed) and then write to the new physical page.
331 bool clobber = true;
332 pTable->map(vaddr, new_paddr, PageBytes, clobber);
333 new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
334 delete[] buf_p;
335}
336
337bool
338Process::fixupStackFault(Addr vaddr)
339{
340 Addr stack_min = memState->getStackMin();
341 Addr stack_base = memState->getStackBase();
342 Addr max_stack_size = memState->getMaxStackSize();
343
344 // Check if this is already on the stack and there's just no page there
345 // yet.
346 if (vaddr >= stack_min && vaddr < stack_base) {
347 allocateMem(roundDown(vaddr, PageBytes), PageBytes);
348 return true;
349 }
350
351 // We've accessed the next page of the stack, so extend it to include
352 // this address.
353 if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) {
354 while (vaddr < stack_min) {
355 stack_min -= TheISA::PageBytes;
356 if (stack_base - stack_min > max_stack_size)
357 fatal("Maximum stack size exceeded\n");
358 allocateMem(stack_min, TheISA::PageBytes);
359 inform("Increasing stack size by one page.");
360 }
361 memState->setStackMin(stack_min);
362 return true;
363 }
364 return false;
365}
366
367void
368Process::serialize(CheckpointOut &cp) const
369{
|
387 pTable->unserialize(cp);
388 /**
389 * Checkpoints for file descriptors currently do not work. Need to
390 * come back and fix them at a later date.
391 */
392 warn("Checkpoints for file descriptors currently do not work.");
393#if 0
394 for (int x = 0; x < fds->getSize(); x++)
395 (*fds)[x]->unserializeSection(cp, csprintf("FDEntry%d", x));
396 fds->restoreFileOffsets();
397#endif
398 // The above returns a bool so that you could do something if you don't
399 // find the param in the checkpoint if you wanted to, like set a default
400 // but in this case we'll just stick with the instantiated value if not
401 // found.
402}
403
404bool
405Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
406{
407 pTable->map(vaddr, paddr, size,
408 cacheable ? PageTableBase::Zero : PageTableBase::Uncacheable);
409 return true;
410}
411
412void
413Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
414{
415 numSyscalls++;
416
417 SyscallDesc *desc = getDesc(callnum);
418 if (desc == nullptr)
419 fatal("Syscall %d out of range", callnum);
420
421 desc->doSyscall(callnum, this, tc, fault);
422}
423
424IntReg
425Process::getSyscallArg(ThreadContext *tc, int &i, int width)
426{
427 return getSyscallArg(tc, i);
428}
429
430EmulatedDriver *
431Process::findDriver(std::string filename)
432{
433 for (EmulatedDriver *d : drivers) {
434 if (d->match(filename))
435 return d;
436 }
437
438 return nullptr;
439}
440
441void
442Process::updateBias()
443{
444 ObjectFile *interp = objFile->getInterpreter();
445
446 if (!interp || !interp->relocatable())
447 return;
448
449 // Determine how large the interpreters footprint will be in the process
450 // address space.
451 Addr interp_mapsize = roundUp(interp->mapSize(), TheISA::PageBytes);
452
453 // We are allocating the memory area; set the bias to the lowest address
454 // in the allocated memory region.
455 Addr mmap_end = memState->getMmapEnd();
456 Addr ld_bias = mmapGrowsDown() ? mmap_end - interp_mapsize : mmap_end;
457
458 // Adjust the process mmap area to give the interpreter room; the real
459 // execve system call would just invoke the kernel's internal mmap
460 // functions to make these adjustments.
461 mmap_end = mmapGrowsDown() ? ld_bias : mmap_end + interp_mapsize;
462 memState->setMmapEnd(mmap_end);
463
464 interp->updateBias(ld_bias);
465}
466
467ObjectFile *
468Process::getInterpreter()
469{
470 return objFile->getInterpreter();
471}
472
473Addr
474Process::getBias()
475{
476 ObjectFile *interp = getInterpreter();
477
478 return interp ? interp->bias() : objFile->bias();
479}
480
481Addr
482Process::getStartPC()
483{
484 ObjectFile *interp = getInterpreter();
485
486 return interp ? interp->entryPoint() : objFile->entryPoint();
487}
488
489Process *
490ProcessParams::create()
491{
492 Process *process = nullptr;
493
494 // If not specified, set the executable parameter equal to the
495 // simulated system's zeroth command line parameter
496 if (executable == "") {
497 executable = cmd[0];
498 }
499
500 ObjectFile *obj_file = createObjectFile(executable);
501 if (obj_file == nullptr) {
502 fatal("Can't load object file %s", executable);
503 }
504
505#if THE_ISA == ALPHA_ISA
506 if (obj_file->getArch() != ObjectFile::Alpha)
507 fatal("Object file architecture does not match compiled ISA (Alpha).");
508
509 switch (obj_file->getOpSys()) {
510 case ObjectFile::UnknownOpSys:
511 warn("Unknown operating system; assuming Linux.");
512 // fall through
513 case ObjectFile::Linux:
514 process = new AlphaLinuxProcess(this, obj_file);
515 break;
516
517 default:
518 fatal("Unknown/unsupported operating system.");
519 }
520#elif THE_ISA == SPARC_ISA
521 if (obj_file->getArch() != ObjectFile::SPARC64 &&
522 obj_file->getArch() != ObjectFile::SPARC32)
523 fatal("Object file architecture does not match compiled ISA (SPARC).");
524 switch (obj_file->getOpSys()) {
525 case ObjectFile::UnknownOpSys:
526 warn("Unknown operating system; assuming Linux.");
527 // fall through
528 case ObjectFile::Linux:
529 if (obj_file->getArch() == ObjectFile::SPARC64) {
530 process = new Sparc64LinuxProcess(this, obj_file);
531 } else {
532 process = new Sparc32LinuxProcess(this, obj_file);
533 }
534 break;
535
536 case ObjectFile::Solaris:
537 process = new SparcSolarisProcess(this, obj_file);
538 break;
539
540 default:
541 fatal("Unknown/unsupported operating system.");
542 }
543#elif THE_ISA == X86_ISA
544 if (obj_file->getArch() != ObjectFile::X86_64 &&
545 obj_file->getArch() != ObjectFile::I386)
546 fatal("Object file architecture does not match compiled ISA (x86).");
547 switch (obj_file->getOpSys()) {
548 case ObjectFile::UnknownOpSys:
549 warn("Unknown operating system; assuming Linux.");
550 // fall through
551 case ObjectFile::Linux:
552 if (obj_file->getArch() == ObjectFile::X86_64) {
553 process = new X86_64LinuxProcess(this, obj_file);
554 } else {
555 process = new I386LinuxProcess(this, obj_file);
556 }
557 break;
558
559 default:
560 fatal("Unknown/unsupported operating system.");
561 }
562#elif THE_ISA == MIPS_ISA
563 if (obj_file->getArch() != ObjectFile::Mips)
564 fatal("Object file architecture does not match compiled ISA (MIPS).");
565 switch (obj_file->getOpSys()) {
566 case ObjectFile::UnknownOpSys:
567 warn("Unknown operating system; assuming Linux.");
568 // fall through
569 case ObjectFile::Linux:
570 process = new MipsLinuxProcess(this, obj_file);
571 break;
572
573 default:
574 fatal("Unknown/unsupported operating system.");
575 }
576#elif THE_ISA == ARM_ISA
577 ObjectFile::Arch arch = obj_file->getArch();
578 if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb &&
579 arch != ObjectFile::Arm64)
580 fatal("Object file architecture does not match compiled ISA (ARM).");
581 switch (obj_file->getOpSys()) {
582 case ObjectFile::UnknownOpSys:
583 warn("Unknown operating system; assuming Linux.");
584 // fall through
585 case ObjectFile::Linux:
586 if (arch == ObjectFile::Arm64) {
587 process = new ArmLinuxProcess64(this, obj_file,
588 obj_file->getArch());
589 } else {
590 process = new ArmLinuxProcess32(this, obj_file,
591 obj_file->getArch());
592 }
593 break;
594 case ObjectFile::FreeBSD:
595 if (arch == ObjectFile::Arm64) {
596 process = new ArmFreebsdProcess64(this, obj_file,
597 obj_file->getArch());
598 } else {
599 process = new ArmFreebsdProcess32(this, obj_file,
600 obj_file->getArch());
601 }
602 break;
603 case ObjectFile::LinuxArmOABI:
604 fatal("M5 does not support ARM OABI binaries. Please recompile with an"
605 " EABI compiler.");
606 default:
607 fatal("Unknown/unsupported operating system.");
608 }
609#elif THE_ISA == POWER_ISA
610 if (obj_file->getArch() != ObjectFile::Power)
611 fatal("Object file architecture does not match compiled ISA (Power).");
612 switch (obj_file->getOpSys()) {
613 case ObjectFile::UnknownOpSys:
614 warn("Unknown operating system; assuming Linux.");
615 // fall through
616 case ObjectFile::Linux:
617 process = new PowerLinuxProcess(this, obj_file);
618 break;
619
620 default:
621 fatal("Unknown/unsupported operating system.");
622 }
623#elif THE_ISA == RISCV_ISA
624 if (obj_file->getArch() != ObjectFile::Riscv)
625 fatal("Object file architecture does not match compiled ISA (RISCV).");
626 switch (obj_file->getOpSys()) {
627 case ObjectFile::UnknownOpSys:
628 warn("Unknown operating system; assuming Linux.");
629 // fall through
630 case ObjectFile::Linux:
631 process = new RiscvLinuxProcess(this, obj_file);
632 break;
633 default:
634 fatal("Unknown/unsupported operating system.");
635 }
636#else
637#error "THE_ISA not set"
638#endif
639
640 if (process == nullptr)
641 fatal("Unknown error creating process object.");
642 return process;
643}
644
645std::string
646Process::fullPath(const std::string &file_name)
647{
648 if (file_name[0] == '/' || cwd.empty())
649 return file_name;
650
651 std::string full = cwd;
652
653 if (cwd[cwd.size() - 1] != '/')
654 full += '/';
655
656 return full + file_name;
657}
| 389 pTable->unserialize(cp);
390 /**
391 * Checkpoints for file descriptors currently do not work. Need to
392 * come back and fix them at a later date.
393 */
394 warn("Checkpoints for file descriptors currently do not work.");
395#if 0
396 for (int x = 0; x < fds->getSize(); x++)
397 (*fds)[x]->unserializeSection(cp, csprintf("FDEntry%d", x));
398 fds->restoreFileOffsets();
399#endif
400 // The above returns a bool so that you could do something if you don't
401 // find the param in the checkpoint if you wanted to, like set a default
402 // but in this case we'll just stick with the instantiated value if not
403 // found.
404}
405
406bool
407Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
408{
409 pTable->map(vaddr, paddr, size,
410 cacheable ? PageTableBase::Zero : PageTableBase::Uncacheable);
411 return true;
412}
413
414void
415Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
416{
417 numSyscalls++;
418
419 SyscallDesc *desc = getDesc(callnum);
420 if (desc == nullptr)
421 fatal("Syscall %d out of range", callnum);
422
423 desc->doSyscall(callnum, this, tc, fault);
424}
425
426IntReg
427Process::getSyscallArg(ThreadContext *tc, int &i, int width)
428{
429 return getSyscallArg(tc, i);
430}
431
432EmulatedDriver *
433Process::findDriver(std::string filename)
434{
435 for (EmulatedDriver *d : drivers) {
436 if (d->match(filename))
437 return d;
438 }
439
440 return nullptr;
441}
442
443void
444Process::updateBias()
445{
446 ObjectFile *interp = objFile->getInterpreter();
447
448 if (!interp || !interp->relocatable())
449 return;
450
451 // Determine how large the interpreters footprint will be in the process
452 // address space.
453 Addr interp_mapsize = roundUp(interp->mapSize(), TheISA::PageBytes);
454
455 // We are allocating the memory area; set the bias to the lowest address
456 // in the allocated memory region.
457 Addr mmap_end = memState->getMmapEnd();
458 Addr ld_bias = mmapGrowsDown() ? mmap_end - interp_mapsize : mmap_end;
459
460 // Adjust the process mmap area to give the interpreter room; the real
461 // execve system call would just invoke the kernel's internal mmap
462 // functions to make these adjustments.
463 mmap_end = mmapGrowsDown() ? ld_bias : mmap_end + interp_mapsize;
464 memState->setMmapEnd(mmap_end);
465
466 interp->updateBias(ld_bias);
467}
468
469ObjectFile *
470Process::getInterpreter()
471{
472 return objFile->getInterpreter();
473}
474
475Addr
476Process::getBias()
477{
478 ObjectFile *interp = getInterpreter();
479
480 return interp ? interp->bias() : objFile->bias();
481}
482
483Addr
484Process::getStartPC()
485{
486 ObjectFile *interp = getInterpreter();
487
488 return interp ? interp->entryPoint() : objFile->entryPoint();
489}
490
491Process *
492ProcessParams::create()
493{
494 Process *process = nullptr;
495
496 // If not specified, set the executable parameter equal to the
497 // simulated system's zeroth command line parameter
498 if (executable == "") {
499 executable = cmd[0];
500 }
501
502 ObjectFile *obj_file = createObjectFile(executable);
503 if (obj_file == nullptr) {
504 fatal("Can't load object file %s", executable);
505 }
506
507#if THE_ISA == ALPHA_ISA
508 if (obj_file->getArch() != ObjectFile::Alpha)
509 fatal("Object file architecture does not match compiled ISA (Alpha).");
510
511 switch (obj_file->getOpSys()) {
512 case ObjectFile::UnknownOpSys:
513 warn("Unknown operating system; assuming Linux.");
514 // fall through
515 case ObjectFile::Linux:
516 process = new AlphaLinuxProcess(this, obj_file);
517 break;
518
519 default:
520 fatal("Unknown/unsupported operating system.");
521 }
522#elif THE_ISA == SPARC_ISA
523 if (obj_file->getArch() != ObjectFile::SPARC64 &&
524 obj_file->getArch() != ObjectFile::SPARC32)
525 fatal("Object file architecture does not match compiled ISA (SPARC).");
526 switch (obj_file->getOpSys()) {
527 case ObjectFile::UnknownOpSys:
528 warn("Unknown operating system; assuming Linux.");
529 // fall through
530 case ObjectFile::Linux:
531 if (obj_file->getArch() == ObjectFile::SPARC64) {
532 process = new Sparc64LinuxProcess(this, obj_file);
533 } else {
534 process = new Sparc32LinuxProcess(this, obj_file);
535 }
536 break;
537
538 case ObjectFile::Solaris:
539 process = new SparcSolarisProcess(this, obj_file);
540 break;
541
542 default:
543 fatal("Unknown/unsupported operating system.");
544 }
545#elif THE_ISA == X86_ISA
546 if (obj_file->getArch() != ObjectFile::X86_64 &&
547 obj_file->getArch() != ObjectFile::I386)
548 fatal("Object file architecture does not match compiled ISA (x86).");
549 switch (obj_file->getOpSys()) {
550 case ObjectFile::UnknownOpSys:
551 warn("Unknown operating system; assuming Linux.");
552 // fall through
553 case ObjectFile::Linux:
554 if (obj_file->getArch() == ObjectFile::X86_64) {
555 process = new X86_64LinuxProcess(this, obj_file);
556 } else {
557 process = new I386LinuxProcess(this, obj_file);
558 }
559 break;
560
561 default:
562 fatal("Unknown/unsupported operating system.");
563 }
564#elif THE_ISA == MIPS_ISA
565 if (obj_file->getArch() != ObjectFile::Mips)
566 fatal("Object file architecture does not match compiled ISA (MIPS).");
567 switch (obj_file->getOpSys()) {
568 case ObjectFile::UnknownOpSys:
569 warn("Unknown operating system; assuming Linux.");
570 // fall through
571 case ObjectFile::Linux:
572 process = new MipsLinuxProcess(this, obj_file);
573 break;
574
575 default:
576 fatal("Unknown/unsupported operating system.");
577 }
578#elif THE_ISA == ARM_ISA
579 ObjectFile::Arch arch = obj_file->getArch();
580 if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb &&
581 arch != ObjectFile::Arm64)
582 fatal("Object file architecture does not match compiled ISA (ARM).");
583 switch (obj_file->getOpSys()) {
584 case ObjectFile::UnknownOpSys:
585 warn("Unknown operating system; assuming Linux.");
586 // fall through
587 case ObjectFile::Linux:
588 if (arch == ObjectFile::Arm64) {
589 process = new ArmLinuxProcess64(this, obj_file,
590 obj_file->getArch());
591 } else {
592 process = new ArmLinuxProcess32(this, obj_file,
593 obj_file->getArch());
594 }
595 break;
596 case ObjectFile::FreeBSD:
597 if (arch == ObjectFile::Arm64) {
598 process = new ArmFreebsdProcess64(this, obj_file,
599 obj_file->getArch());
600 } else {
601 process = new ArmFreebsdProcess32(this, obj_file,
602 obj_file->getArch());
603 }
604 break;
605 case ObjectFile::LinuxArmOABI:
606 fatal("M5 does not support ARM OABI binaries. Please recompile with an"
607 " EABI compiler.");
608 default:
609 fatal("Unknown/unsupported operating system.");
610 }
611#elif THE_ISA == POWER_ISA
612 if (obj_file->getArch() != ObjectFile::Power)
613 fatal("Object file architecture does not match compiled ISA (Power).");
614 switch (obj_file->getOpSys()) {
615 case ObjectFile::UnknownOpSys:
616 warn("Unknown operating system; assuming Linux.");
617 // fall through
618 case ObjectFile::Linux:
619 process = new PowerLinuxProcess(this, obj_file);
620 break;
621
622 default:
623 fatal("Unknown/unsupported operating system.");
624 }
625#elif THE_ISA == RISCV_ISA
626 if (obj_file->getArch() != ObjectFile::Riscv)
627 fatal("Object file architecture does not match compiled ISA (RISCV).");
628 switch (obj_file->getOpSys()) {
629 case ObjectFile::UnknownOpSys:
630 warn("Unknown operating system; assuming Linux.");
631 // fall through
632 case ObjectFile::Linux:
633 process = new RiscvLinuxProcess(this, obj_file);
634 break;
635 default:
636 fatal("Unknown/unsupported operating system.");
637 }
638#else
639#error "THE_ISA not set"
640#endif
641
642 if (process == nullptr)
643 fatal("Unknown error creating process object.");
644 return process;
645}
646
647std::string
648Process::fullPath(const std::string &file_name)
649{
650 if (file_name[0] == '/' || cwd.empty())
651 return file_name;
652
653 std::string full = cwd;
654
655 if (cwd[cwd.size() - 1] != '/')
656 full += '/';
657
658 return full + file_name;
659}
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