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 <climits>
54#include <csignal>
55#include <map>
56#include <string>
57#include <vector>
58
59#include "base/intmath.hh"
60#include "base/loader/object_file.hh"
61#include "base/loader/symtab.hh"
62#include "base/statistics.hh"
63#include "config/the_isa.hh"
64#include "cpu/thread_context.hh"
65#include "mem/page_table.hh"
66#include "mem/se_translating_port_proxy.hh"
67#include "params/Process.hh"
68#include "sim/emul_driver.hh"
69#include "sim/fd_array.hh"
70#include "sim/fd_entry.hh"
71#include "sim/redirect_path.hh"
72#include "sim/syscall_desc.hh"
73#include "sim/system.hh"
74
75#if THE_ISA == ALPHA_ISA
76#include "arch/alpha/linux/process.hh"
77
78#elif THE_ISA == SPARC_ISA
79#include "arch/sparc/linux/process.hh"
80#include "arch/sparc/solaris/process.hh"
81
82#elif THE_ISA == MIPS_ISA
83#include "arch/mips/linux/process.hh"
84
85#elif THE_ISA == ARM_ISA
86#include "arch/arm/freebsd/process.hh"
87#include "arch/arm/linux/process.hh"
88
89#elif THE_ISA == X86_ISA
90#include "arch/x86/linux/process.hh"
91
92#elif THE_ISA == POWER_ISA
93#include "arch/power/linux/process.hh"
94
95#elif THE_ISA == RISCV_ISA
96#include "arch/riscv/linux/process.hh"
97
98#else
99#error "THE_ISA not set"
100#endif
101
102
103using namespace std;
104using namespace TheISA;
105
106static std::string
107normalize(std::string& directory)
108{
109 if (directory.back() != '/')
110 directory += '/';
111 return directory;
112}
113
114Process::Process(ProcessParams *params, EmulationPageTable *pTable,
115 ObjectFile *obj_file)
116 : SimObject(params), system(params->system),
117 useArchPT(params->useArchPT),
118 kvmInSE(params->kvmInSE),
119 useForClone(false),
120 pTable(pTable),
121 initVirtMem(system->getSystemPort(), this,
122 SETranslatingPortProxy::Always),
123 objFile(obj_file),
124 argv(params->cmd), envp(params->env),
125 executable(params->executable),
126 tgtCwd(normalize(params->cwd)),
127 hostCwd(checkPathRedirect(tgtCwd)),
128 _uid(params->uid), _euid(params->euid),
129 _gid(params->gid), _egid(params->egid),
130 _pid(params->pid), _ppid(params->ppid),
131 _pgid(params->pgid), drivers(params->drivers),
132 fds(make_shared<FDArray>(params->input, params->output, params->errout)),
133 childClearTID(0)
134{
135 if (_pid >= System::maxPID)
136 fatal("_pid is too large: %d", _pid);
137
138 auto ret_pair = system->PIDs.emplace(_pid);
139 if (!ret_pair.second)
140 fatal("_pid %d is already used", _pid);
141
142 /**
143 * Linux bundles together processes into this concept called a thread
144 * group. The thread group is responsible for recording which processes
145 * behave as threads within a process context. The thread group leader
146 * is the process who's tgid is equal to its pid. Other processes which
147 * belong to the thread group, but do not lead the thread group, are
148 * treated as child threads. These threads are created by the clone system
149 * call with options specified to create threads (differing from the
150 * options used to implement a fork). By default, set up the tgid/pid
151 * with a new, equivalent value. If CLONE_THREAD is specified, patch
152 * the tgid value with the old process' value.
153 */
154 _tgid = params->pid;
155
156 exitGroup = new bool();
157 sigchld = new bool();
158
159 if (!debugSymbolTable) {
160 debugSymbolTable = new SymbolTable();
161 if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
162 !objFile->loadLocalSymbols(debugSymbolTable) ||
163 !objFile->loadWeakSymbols(debugSymbolTable)) {
164 delete debugSymbolTable;
165 debugSymbolTable = nullptr;
166 }
167 }
168}
169
170void
171Process::clone(ThreadContext *otc, ThreadContext *ntc,
172 Process *np, RegVal flags)
173{
174#ifndef CLONE_VM
175#define CLONE_VM 0
176#endif
177#ifndef CLONE_FILES
178#define CLONE_FILES 0
179#endif
180#ifndef CLONE_THREAD
181#define CLONE_THREAD 0
182#endif
183 if (CLONE_VM & flags) {
184 /**
185 * Share the process memory address space between the new process
186 * and the old process. Changes in one will be visible in the other
187 * due to the pointer use.
188 */
189 delete np->pTable;
190 np->pTable = pTable;
191 ntc->getMemProxy().setPageTable(np->pTable);
192
193 np->memState = memState;
194 } else {
195 /**
196 * Duplicate the process memory address space. The state needs to be
197 * copied over (rather than using pointers to share everything).
198 */
199 typedef std::vector<pair<Addr,Addr>> MapVec;
200 MapVec mappings;
201 pTable->getMappings(&mappings);
202
203 for (auto map : mappings) {
204 Addr paddr, vaddr = map.first;
205 bool alloc_page = !(np->pTable->translate(vaddr, paddr));
206 np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
207 }
208
209 *np->memState = *memState;
210 }
211
212 if (CLONE_FILES & flags) {
213 /**
214 * The parent and child file descriptors are shared because the
215 * two FDArray pointers are pointing to the same FDArray. Opening
216 * and closing file descriptors will be visible to both processes.
217 */
218 np->fds = fds;
219 } else {
220 /**
221 * Copy the file descriptors from the old process into the new
222 * child process. The file descriptors entry can be opened and
223 * closed independently of the other process being considered. The
224 * host file descriptors are also dup'd so that the flags for the
225 * host file descriptor is independent of the other process.
226 */
227 for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
228 std::shared_ptr<FDArray> nfds = np->fds;
229 std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
230 if (!this_fde) {
231 nfds->setFDEntry(tgt_fd, nullptr);
232 continue;
233 }
234 nfds->setFDEntry(tgt_fd, this_fde->clone());
235
236 auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
237 if (!this_hbfd)
238 continue;
239
240 int this_sim_fd = this_hbfd->getSimFD();
241 if (this_sim_fd <= 2)
242 continue;
243
244 int np_sim_fd = dup(this_sim_fd);
245 assert(np_sim_fd != -1);
246
247 auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
248 nhbfd->setSimFD(np_sim_fd);
249 }
250 }
251
252 if (CLONE_THREAD & flags) {
253 np->_tgid = _tgid;
254 delete np->exitGroup;
255 np->exitGroup = exitGroup;
256 }
257
258 np->argv.insert(np->argv.end(), argv.begin(), argv.end());
259 np->envp.insert(np->envp.end(), envp.begin(), envp.end());
260}
261
262void
263Process::regStats()
264{
265 SimObject::regStats();
266
267 using namespace Stats;
268
269 numSyscalls
270 .name(name() + ".numSyscalls")
271 .desc("Number of system calls")
272 ;
273}
274
275ThreadContext *
276Process::findFreeContext()
277{
278 for (auto &it : system->threadContexts) {
279 if (ThreadContext::Halted == it->status())
280 return it;
281 }
282 return nullptr;
283}
284
285void
286Process::revokeThreadContext(int context_id)
287{
288 std::vector<ContextID>::iterator it;
289 for (it = contextIds.begin(); it != contextIds.end(); it++) {
290 if (*it == context_id) {
291 contextIds.erase(it);
292 return;
293 }
294 }
295 warn("Unable to find thread context to revoke");
296}
297
298void
299Process::initState()
300{
301 if (contextIds.empty())
302 fatal("Process %s is not associated with any HW contexts!\n", name());
303
304 // first thread context for this process... initialize & enable
305 ThreadContext *tc = system->getThreadContext(contextIds[0]);
306
307 // mark this context as active so it will start ticking.
308 tc->activate();
309
310 pTable->initState(tc);
311}
312
313DrainState
314Process::drain()
315{
316 fds->updateFileOffsets();
317 return DrainState::Drained;
318}
319
320void
321Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
322{
323 int npages = divCeil(size, (int64_t)PageBytes);
324 Addr paddr = system->allocPhysPages(npages);
325 pTable->map(vaddr, paddr, size,
326 clobber ? EmulationPageTable::Clobber :
327 EmulationPageTable::MappingFlags(0));
328}
329
330void
331Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
332 ThreadContext *new_tc, bool allocate_page)
333{
334 if (allocate_page)
335 new_paddr = system->allocPhysPages(1);
336
337 // Read from old physical page.
338 uint8_t *buf_p = new uint8_t[PageBytes];
339 old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
340
341 // Create new mapping in process address space by clobbering existing
342 // mapping (if any existed) and then write to the new physical page.
343 bool clobber = true;
344 pTable->map(vaddr, new_paddr, PageBytes, clobber);
345 new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
346 delete[] buf_p;
347}
348
349bool
350Process::fixupStackFault(Addr vaddr)
351{
352 Addr stack_min = memState->getStackMin();
353 Addr stack_base = memState->getStackBase();
354 Addr max_stack_size = memState->getMaxStackSize();
355
356 // Check if this is already on the stack and there's just no page there
357 // yet.
358 if (vaddr >= stack_min && vaddr < stack_base) {
359 allocateMem(roundDown(vaddr, PageBytes), PageBytes);
360 return true;
361 }
362
363 // We've accessed the next page of the stack, so extend it to include
364 // this address.
365 if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) {
366 while (vaddr < stack_min) {
367 stack_min -= TheISA::PageBytes;
368 if (stack_base - stack_min > max_stack_size)
369 fatal("Maximum stack size exceeded\n");
370 allocateMem(stack_min, TheISA::PageBytes);
371 inform("Increasing stack size by one page.");
372 }
373 memState->setStackMin(stack_min);
374 return true;
375 }
376 return false;
377}
378
379void
380Process::serialize(CheckpointOut &cp) const
381{
382 memState->serialize(cp);
383 pTable->serialize(cp);
384 /**
385 * Checkpoints for file descriptors currently do not work. Need to
386 * come back and fix them at a later date.
387 */
388
389 warn("Checkpoints for file descriptors currently do not work.");
390#if 0
391 for (int x = 0; x < fds->getSize(); x++)
392 (*fds)[x].serializeSection(cp, csprintf("FDEntry%d", x));
393#endif
394
395}
396
397void
398Process::unserialize(CheckpointIn &cp)
399{
400 memState->unserialize(cp);
401 pTable->unserialize(cp);
402 /**
403 * Checkpoints for file descriptors currently do not work. Need to
404 * come back and fix them at a later date.
405 */
406 warn("Checkpoints for file descriptors currently do not work.");
407#if 0
408 for (int x = 0; x < fds->getSize(); x++)
409 (*fds)[x]->unserializeSection(cp, csprintf("FDEntry%d", x));
410 fds->restoreFileOffsets();
411#endif
412 // The above returns a bool so that you could do something if you don't
413 // find the param in the checkpoint if you wanted to, like set a default
414 // but in this case we'll just stick with the instantiated value if not
415 // found.
416}
417
418bool
419Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
420{
421 pTable->map(vaddr, paddr, size,
422 cacheable ? EmulationPageTable::MappingFlags(0) :
423 EmulationPageTable::Uncacheable);
424 return true;
425}
426
427void
428Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
429{
430 numSyscalls++;
431
432 SyscallDesc *desc = getDesc(callnum);
433 if (desc == nullptr)
434 fatal("Syscall %d out of range", callnum);
435
436 desc->doSyscall(callnum, this, tc, fault);
437}
438
439RegVal
440Process::getSyscallArg(ThreadContext *tc, int &i, int width)
441{
442 return getSyscallArg(tc, i);
443}
444
445EmulatedDriver *
446Process::findDriver(std::string filename)
447{
448 for (EmulatedDriver *d : drivers) {
449 if (d->match(filename))
450 return d;
451 }
452
453 return nullptr;
454}
455
456std::string
457Process::checkPathRedirect(const std::string &filename)
458{
| 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 <climits>
54#include <csignal>
55#include <map>
56#include <string>
57#include <vector>
58
59#include "base/intmath.hh"
60#include "base/loader/object_file.hh"
61#include "base/loader/symtab.hh"
62#include "base/statistics.hh"
63#include "config/the_isa.hh"
64#include "cpu/thread_context.hh"
65#include "mem/page_table.hh"
66#include "mem/se_translating_port_proxy.hh"
67#include "params/Process.hh"
68#include "sim/emul_driver.hh"
69#include "sim/fd_array.hh"
70#include "sim/fd_entry.hh"
71#include "sim/redirect_path.hh"
72#include "sim/syscall_desc.hh"
73#include "sim/system.hh"
74
75#if THE_ISA == ALPHA_ISA
76#include "arch/alpha/linux/process.hh"
77
78#elif THE_ISA == SPARC_ISA
79#include "arch/sparc/linux/process.hh"
80#include "arch/sparc/solaris/process.hh"
81
82#elif THE_ISA == MIPS_ISA
83#include "arch/mips/linux/process.hh"
84
85#elif THE_ISA == ARM_ISA
86#include "arch/arm/freebsd/process.hh"
87#include "arch/arm/linux/process.hh"
88
89#elif THE_ISA == X86_ISA
90#include "arch/x86/linux/process.hh"
91
92#elif THE_ISA == POWER_ISA
93#include "arch/power/linux/process.hh"
94
95#elif THE_ISA == RISCV_ISA
96#include "arch/riscv/linux/process.hh"
97
98#else
99#error "THE_ISA not set"
100#endif
101
102
103using namespace std;
104using namespace TheISA;
105
106static std::string
107normalize(std::string& directory)
108{
109 if (directory.back() != '/')
110 directory += '/';
111 return directory;
112}
113
114Process::Process(ProcessParams *params, EmulationPageTable *pTable,
115 ObjectFile *obj_file)
116 : SimObject(params), system(params->system),
117 useArchPT(params->useArchPT),
118 kvmInSE(params->kvmInSE),
119 useForClone(false),
120 pTable(pTable),
121 initVirtMem(system->getSystemPort(), this,
122 SETranslatingPortProxy::Always),
123 objFile(obj_file),
124 argv(params->cmd), envp(params->env),
125 executable(params->executable),
126 tgtCwd(normalize(params->cwd)),
127 hostCwd(checkPathRedirect(tgtCwd)),
128 _uid(params->uid), _euid(params->euid),
129 _gid(params->gid), _egid(params->egid),
130 _pid(params->pid), _ppid(params->ppid),
131 _pgid(params->pgid), drivers(params->drivers),
132 fds(make_shared<FDArray>(params->input, params->output, params->errout)),
133 childClearTID(0)
134{
135 if (_pid >= System::maxPID)
136 fatal("_pid is too large: %d", _pid);
137
138 auto ret_pair = system->PIDs.emplace(_pid);
139 if (!ret_pair.second)
140 fatal("_pid %d is already used", _pid);
141
142 /**
143 * Linux bundles together processes into this concept called a thread
144 * group. The thread group is responsible for recording which processes
145 * behave as threads within a process context. The thread group leader
146 * is the process who's tgid is equal to its pid. Other processes which
147 * belong to the thread group, but do not lead the thread group, are
148 * treated as child threads. These threads are created by the clone system
149 * call with options specified to create threads (differing from the
150 * options used to implement a fork). By default, set up the tgid/pid
151 * with a new, equivalent value. If CLONE_THREAD is specified, patch
152 * the tgid value with the old process' value.
153 */
154 _tgid = params->pid;
155
156 exitGroup = new bool();
157 sigchld = new bool();
158
159 if (!debugSymbolTable) {
160 debugSymbolTable = new SymbolTable();
161 if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
162 !objFile->loadLocalSymbols(debugSymbolTable) ||
163 !objFile->loadWeakSymbols(debugSymbolTable)) {
164 delete debugSymbolTable;
165 debugSymbolTable = nullptr;
166 }
167 }
168}
169
170void
171Process::clone(ThreadContext *otc, ThreadContext *ntc,
172 Process *np, RegVal flags)
173{
174#ifndef CLONE_VM
175#define CLONE_VM 0
176#endif
177#ifndef CLONE_FILES
178#define CLONE_FILES 0
179#endif
180#ifndef CLONE_THREAD
181#define CLONE_THREAD 0
182#endif
183 if (CLONE_VM & flags) {
184 /**
185 * Share the process memory address space between the new process
186 * and the old process. Changes in one will be visible in the other
187 * due to the pointer use.
188 */
189 delete np->pTable;
190 np->pTable = pTable;
191 ntc->getMemProxy().setPageTable(np->pTable);
192
193 np->memState = memState;
194 } else {
195 /**
196 * Duplicate the process memory address space. The state needs to be
197 * copied over (rather than using pointers to share everything).
198 */
199 typedef std::vector<pair<Addr,Addr>> MapVec;
200 MapVec mappings;
201 pTable->getMappings(&mappings);
202
203 for (auto map : mappings) {
204 Addr paddr, vaddr = map.first;
205 bool alloc_page = !(np->pTable->translate(vaddr, paddr));
206 np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
207 }
208
209 *np->memState = *memState;
210 }
211
212 if (CLONE_FILES & flags) {
213 /**
214 * The parent and child file descriptors are shared because the
215 * two FDArray pointers are pointing to the same FDArray. Opening
216 * and closing file descriptors will be visible to both processes.
217 */
218 np->fds = fds;
219 } else {
220 /**
221 * Copy the file descriptors from the old process into the new
222 * child process. The file descriptors entry can be opened and
223 * closed independently of the other process being considered. The
224 * host file descriptors are also dup'd so that the flags for the
225 * host file descriptor is independent of the other process.
226 */
227 for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
228 std::shared_ptr<FDArray> nfds = np->fds;
229 std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
230 if (!this_fde) {
231 nfds->setFDEntry(tgt_fd, nullptr);
232 continue;
233 }
234 nfds->setFDEntry(tgt_fd, this_fde->clone());
235
236 auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
237 if (!this_hbfd)
238 continue;
239
240 int this_sim_fd = this_hbfd->getSimFD();
241 if (this_sim_fd <= 2)
242 continue;
243
244 int np_sim_fd = dup(this_sim_fd);
245 assert(np_sim_fd != -1);
246
247 auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
248 nhbfd->setSimFD(np_sim_fd);
249 }
250 }
251
252 if (CLONE_THREAD & flags) {
253 np->_tgid = _tgid;
254 delete np->exitGroup;
255 np->exitGroup = exitGroup;
256 }
257
258 np->argv.insert(np->argv.end(), argv.begin(), argv.end());
259 np->envp.insert(np->envp.end(), envp.begin(), envp.end());
260}
261
262void
263Process::regStats()
264{
265 SimObject::regStats();
266
267 using namespace Stats;
268
269 numSyscalls
270 .name(name() + ".numSyscalls")
271 .desc("Number of system calls")
272 ;
273}
274
275ThreadContext *
276Process::findFreeContext()
277{
278 for (auto &it : system->threadContexts) {
279 if (ThreadContext::Halted == it->status())
280 return it;
281 }
282 return nullptr;
283}
284
285void
286Process::revokeThreadContext(int context_id)
287{
288 std::vector<ContextID>::iterator it;
289 for (it = contextIds.begin(); it != contextIds.end(); it++) {
290 if (*it == context_id) {
291 contextIds.erase(it);
292 return;
293 }
294 }
295 warn("Unable to find thread context to revoke");
296}
297
298void
299Process::initState()
300{
301 if (contextIds.empty())
302 fatal("Process %s is not associated with any HW contexts!\n", name());
303
304 // first thread context for this process... initialize & enable
305 ThreadContext *tc = system->getThreadContext(contextIds[0]);
306
307 // mark this context as active so it will start ticking.
308 tc->activate();
309
310 pTable->initState(tc);
311}
312
313DrainState
314Process::drain()
315{
316 fds->updateFileOffsets();
317 return DrainState::Drained;
318}
319
320void
321Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
322{
323 int npages = divCeil(size, (int64_t)PageBytes);
324 Addr paddr = system->allocPhysPages(npages);
325 pTable->map(vaddr, paddr, size,
326 clobber ? EmulationPageTable::Clobber :
327 EmulationPageTable::MappingFlags(0));
328}
329
330void
331Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
332 ThreadContext *new_tc, bool allocate_page)
333{
334 if (allocate_page)
335 new_paddr = system->allocPhysPages(1);
336
337 // Read from old physical page.
338 uint8_t *buf_p = new uint8_t[PageBytes];
339 old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
340
341 // Create new mapping in process address space by clobbering existing
342 // mapping (if any existed) and then write to the new physical page.
343 bool clobber = true;
344 pTable->map(vaddr, new_paddr, PageBytes, clobber);
345 new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
346 delete[] buf_p;
347}
348
349bool
350Process::fixupStackFault(Addr vaddr)
351{
352 Addr stack_min = memState->getStackMin();
353 Addr stack_base = memState->getStackBase();
354 Addr max_stack_size = memState->getMaxStackSize();
355
356 // Check if this is already on the stack and there's just no page there
357 // yet.
358 if (vaddr >= stack_min && vaddr < stack_base) {
359 allocateMem(roundDown(vaddr, PageBytes), PageBytes);
360 return true;
361 }
362
363 // We've accessed the next page of the stack, so extend it to include
364 // this address.
365 if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) {
366 while (vaddr < stack_min) {
367 stack_min -= TheISA::PageBytes;
368 if (stack_base - stack_min > max_stack_size)
369 fatal("Maximum stack size exceeded\n");
370 allocateMem(stack_min, TheISA::PageBytes);
371 inform("Increasing stack size by one page.");
372 }
373 memState->setStackMin(stack_min);
374 return true;
375 }
376 return false;
377}
378
379void
380Process::serialize(CheckpointOut &cp) const
381{
382 memState->serialize(cp);
383 pTable->serialize(cp);
384 /**
385 * Checkpoints for file descriptors currently do not work. Need to
386 * come back and fix them at a later date.
387 */
388
389 warn("Checkpoints for file descriptors currently do not work.");
390#if 0
391 for (int x = 0; x < fds->getSize(); x++)
392 (*fds)[x].serializeSection(cp, csprintf("FDEntry%d", x));
393#endif
394
395}
396
397void
398Process::unserialize(CheckpointIn &cp)
399{
400 memState->unserialize(cp);
401 pTable->unserialize(cp);
402 /**
403 * Checkpoints for file descriptors currently do not work. Need to
404 * come back and fix them at a later date.
405 */
406 warn("Checkpoints for file descriptors currently do not work.");
407#if 0
408 for (int x = 0; x < fds->getSize(); x++)
409 (*fds)[x]->unserializeSection(cp, csprintf("FDEntry%d", x));
410 fds->restoreFileOffsets();
411#endif
412 // The above returns a bool so that you could do something if you don't
413 // find the param in the checkpoint if you wanted to, like set a default
414 // but in this case we'll just stick with the instantiated value if not
415 // found.
416}
417
418bool
419Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
420{
421 pTable->map(vaddr, paddr, size,
422 cacheable ? EmulationPageTable::MappingFlags(0) :
423 EmulationPageTable::Uncacheable);
424 return true;
425}
426
427void
428Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
429{
430 numSyscalls++;
431
432 SyscallDesc *desc = getDesc(callnum);
433 if (desc == nullptr)
434 fatal("Syscall %d out of range", callnum);
435
436 desc->doSyscall(callnum, this, tc, fault);
437}
438
439RegVal
440Process::getSyscallArg(ThreadContext *tc, int &i, int width)
441{
442 return getSyscallArg(tc, i);
443}
444
445EmulatedDriver *
446Process::findDriver(std::string filename)
447{
448 for (EmulatedDriver *d : drivers) {
449 if (d->match(filename))
450 return d;
451 }
452
453 return nullptr;
454}
455
456std::string
457Process::checkPathRedirect(const std::string &filename)
458{
|
557
558 // Add a trailing '/' if the current working directory did not have one.
559 normalize(path_base);
560
561 // Append the filename onto the current working path.
562 auto absolute_path = path_base + filename;
563
564 return absolute_path;
565}
566
567Process *
568ProcessParams::create()
569{
570 Process *process = nullptr;
571
572 // If not specified, set the executable parameter equal to the
573 // simulated system's zeroth command line parameter
574 if (executable == "") {
575 executable = cmd[0];
576 }
577
578 ObjectFile *obj_file = createObjectFile(executable);
579 if (obj_file == nullptr) {
580 fatal("Can't load object file %s", executable);
581 }
582
583#if THE_ISA == ALPHA_ISA
584 if (obj_file->getArch() != ObjectFile::Alpha)
585 fatal("Object file architecture does not match compiled ISA (Alpha).");
586
587 switch (obj_file->getOpSys()) {
588 case ObjectFile::UnknownOpSys:
589 warn("Unknown operating system; assuming Linux.");
590 // fall through
591 case ObjectFile::Linux:
592 process = new AlphaLinuxProcess(this, obj_file);
593 break;
594
595 default:
596 fatal("Unknown/unsupported operating system.");
597 }
598#elif THE_ISA == SPARC_ISA
599 if (obj_file->getArch() != ObjectFile::SPARC64 &&
600 obj_file->getArch() != ObjectFile::SPARC32)
601 fatal("Object file architecture does not match compiled ISA (SPARC).");
602 switch (obj_file->getOpSys()) {
603 case ObjectFile::UnknownOpSys:
604 warn("Unknown operating system; assuming Linux.");
605 // fall through
606 case ObjectFile::Linux:
607 if (obj_file->getArch() == ObjectFile::SPARC64) {
608 process = new Sparc64LinuxProcess(this, obj_file);
609 } else {
610 process = new Sparc32LinuxProcess(this, obj_file);
611 }
612 break;
613
614 case ObjectFile::Solaris:
615 process = new SparcSolarisProcess(this, obj_file);
616 break;
617
618 default:
619 fatal("Unknown/unsupported operating system.");
620 }
621#elif THE_ISA == X86_ISA
622 if (obj_file->getArch() != ObjectFile::X86_64 &&
623 obj_file->getArch() != ObjectFile::I386)
624 fatal("Object file architecture does not match compiled ISA (x86).");
625 switch (obj_file->getOpSys()) {
626 case ObjectFile::UnknownOpSys:
627 warn("Unknown operating system; assuming Linux.");
628 // fall through
629 case ObjectFile::Linux:
630 if (obj_file->getArch() == ObjectFile::X86_64) {
631 process = new X86_64LinuxProcess(this, obj_file);
632 } else {
633 process = new I386LinuxProcess(this, obj_file);
634 }
635 break;
636
637 default:
638 fatal("Unknown/unsupported operating system.");
639 }
640#elif THE_ISA == MIPS_ISA
641 if (obj_file->getArch() != ObjectFile::Mips)
642 fatal("Object file architecture does not match compiled ISA (MIPS).");
643 switch (obj_file->getOpSys()) {
644 case ObjectFile::UnknownOpSys:
645 warn("Unknown operating system; assuming Linux.");
646 // fall through
647 case ObjectFile::Linux:
648 process = new MipsLinuxProcess(this, obj_file);
649 break;
650
651 default:
652 fatal("Unknown/unsupported operating system.");
653 }
654#elif THE_ISA == ARM_ISA
655 ObjectFile::Arch arch = obj_file->getArch();
656 if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb &&
657 arch != ObjectFile::Arm64)
658 fatal("Object file architecture does not match compiled ISA (ARM).");
659 switch (obj_file->getOpSys()) {
660 case ObjectFile::UnknownOpSys:
661 warn("Unknown operating system; assuming Linux.");
662 // fall through
663 case ObjectFile::Linux:
664 if (arch == ObjectFile::Arm64) {
665 process = new ArmLinuxProcess64(this, obj_file,
666 obj_file->getArch());
667 } else {
668 process = new ArmLinuxProcess32(this, obj_file,
669 obj_file->getArch());
670 }
671 break;
672 case ObjectFile::FreeBSD:
673 if (arch == ObjectFile::Arm64) {
674 process = new ArmFreebsdProcess64(this, obj_file,
675 obj_file->getArch());
676 } else {
677 process = new ArmFreebsdProcess32(this, obj_file,
678 obj_file->getArch());
679 }
680 break;
681 case ObjectFile::LinuxArmOABI:
682 fatal("M5 does not support ARM OABI binaries. Please recompile with an"
683 " EABI compiler.");
684 default:
685 fatal("Unknown/unsupported operating system.");
686 }
687#elif THE_ISA == POWER_ISA
688 if (obj_file->getArch() != ObjectFile::Power)
689 fatal("Object file architecture does not match compiled ISA (Power).");
690 switch (obj_file->getOpSys()) {
691 case ObjectFile::UnknownOpSys:
692 warn("Unknown operating system; assuming Linux.");
693 // fall through
694 case ObjectFile::Linux:
695 process = new PowerLinuxProcess(this, obj_file);
696 break;
697
698 default:
699 fatal("Unknown/unsupported operating system.");
700 }
701#elif THE_ISA == RISCV_ISA
702 ObjectFile::Arch arch = obj_file->getArch();
703 if (arch != ObjectFile::Riscv64 && arch != ObjectFile::Riscv32)
704 fatal("Object file architecture does not match compiled ISA (RISCV).");
705 switch (obj_file->getOpSys()) {
706 case ObjectFile::UnknownOpSys:
707 warn("Unknown operating system; assuming Linux.");
708 // fall through
709 case ObjectFile::Linux:
710 if (arch == ObjectFile::Riscv64) {
711 process = new RiscvLinuxProcess64(this, obj_file);
712 } else {
713 process = new RiscvLinuxProcess32(this, obj_file);
714 }
715 break;
716 default:
717 fatal("Unknown/unsupported operating system.");
718 }
719#else
720#error "THE_ISA not set"
721#endif
722
723 if (process == nullptr)
724 fatal("Unknown error creating process object.");
725 return process;
726}
| 554
555 // Add a trailing '/' if the current working directory did not have one.
556 normalize(path_base);
557
558 // Append the filename onto the current working path.
559 auto absolute_path = path_base + filename;
560
561 return absolute_path;
562}
563
564Process *
565ProcessParams::create()
566{
567 Process *process = nullptr;
568
569 // If not specified, set the executable parameter equal to the
570 // simulated system's zeroth command line parameter
571 if (executable == "") {
572 executable = cmd[0];
573 }
574
575 ObjectFile *obj_file = createObjectFile(executable);
576 if (obj_file == nullptr) {
577 fatal("Can't load object file %s", executable);
578 }
579
580#if THE_ISA == ALPHA_ISA
581 if (obj_file->getArch() != ObjectFile::Alpha)
582 fatal("Object file architecture does not match compiled ISA (Alpha).");
583
584 switch (obj_file->getOpSys()) {
585 case ObjectFile::UnknownOpSys:
586 warn("Unknown operating system; assuming Linux.");
587 // fall through
588 case ObjectFile::Linux:
589 process = new AlphaLinuxProcess(this, obj_file);
590 break;
591
592 default:
593 fatal("Unknown/unsupported operating system.");
594 }
595#elif THE_ISA == SPARC_ISA
596 if (obj_file->getArch() != ObjectFile::SPARC64 &&
597 obj_file->getArch() != ObjectFile::SPARC32)
598 fatal("Object file architecture does not match compiled ISA (SPARC).");
599 switch (obj_file->getOpSys()) {
600 case ObjectFile::UnknownOpSys:
601 warn("Unknown operating system; assuming Linux.");
602 // fall through
603 case ObjectFile::Linux:
604 if (obj_file->getArch() == ObjectFile::SPARC64) {
605 process = new Sparc64LinuxProcess(this, obj_file);
606 } else {
607 process = new Sparc32LinuxProcess(this, obj_file);
608 }
609 break;
610
611 case ObjectFile::Solaris:
612 process = new SparcSolarisProcess(this, obj_file);
613 break;
614
615 default:
616 fatal("Unknown/unsupported operating system.");
617 }
618#elif THE_ISA == X86_ISA
619 if (obj_file->getArch() != ObjectFile::X86_64 &&
620 obj_file->getArch() != ObjectFile::I386)
621 fatal("Object file architecture does not match compiled ISA (x86).");
622 switch (obj_file->getOpSys()) {
623 case ObjectFile::UnknownOpSys:
624 warn("Unknown operating system; assuming Linux.");
625 // fall through
626 case ObjectFile::Linux:
627 if (obj_file->getArch() == ObjectFile::X86_64) {
628 process = new X86_64LinuxProcess(this, obj_file);
629 } else {
630 process = new I386LinuxProcess(this, obj_file);
631 }
632 break;
633
634 default:
635 fatal("Unknown/unsupported operating system.");
636 }
637#elif THE_ISA == MIPS_ISA
638 if (obj_file->getArch() != ObjectFile::Mips)
639 fatal("Object file architecture does not match compiled ISA (MIPS).");
640 switch (obj_file->getOpSys()) {
641 case ObjectFile::UnknownOpSys:
642 warn("Unknown operating system; assuming Linux.");
643 // fall through
644 case ObjectFile::Linux:
645 process = new MipsLinuxProcess(this, obj_file);
646 break;
647
648 default:
649 fatal("Unknown/unsupported operating system.");
650 }
651#elif THE_ISA == ARM_ISA
652 ObjectFile::Arch arch = obj_file->getArch();
653 if (arch != ObjectFile::Arm && arch != ObjectFile::Thumb &&
654 arch != ObjectFile::Arm64)
655 fatal("Object file architecture does not match compiled ISA (ARM).");
656 switch (obj_file->getOpSys()) {
657 case ObjectFile::UnknownOpSys:
658 warn("Unknown operating system; assuming Linux.");
659 // fall through
660 case ObjectFile::Linux:
661 if (arch == ObjectFile::Arm64) {
662 process = new ArmLinuxProcess64(this, obj_file,
663 obj_file->getArch());
664 } else {
665 process = new ArmLinuxProcess32(this, obj_file,
666 obj_file->getArch());
667 }
668 break;
669 case ObjectFile::FreeBSD:
670 if (arch == ObjectFile::Arm64) {
671 process = new ArmFreebsdProcess64(this, obj_file,
672 obj_file->getArch());
673 } else {
674 process = new ArmFreebsdProcess32(this, obj_file,
675 obj_file->getArch());
676 }
677 break;
678 case ObjectFile::LinuxArmOABI:
679 fatal("M5 does not support ARM OABI binaries. Please recompile with an"
680 " EABI compiler.");
681 default:
682 fatal("Unknown/unsupported operating system.");
683 }
684#elif THE_ISA == POWER_ISA
685 if (obj_file->getArch() != ObjectFile::Power)
686 fatal("Object file architecture does not match compiled ISA (Power).");
687 switch (obj_file->getOpSys()) {
688 case ObjectFile::UnknownOpSys:
689 warn("Unknown operating system; assuming Linux.");
690 // fall through
691 case ObjectFile::Linux:
692 process = new PowerLinuxProcess(this, obj_file);
693 break;
694
695 default:
696 fatal("Unknown/unsupported operating system.");
697 }
698#elif THE_ISA == RISCV_ISA
699 ObjectFile::Arch arch = obj_file->getArch();
700 if (arch != ObjectFile::Riscv64 && arch != ObjectFile::Riscv32)
701 fatal("Object file architecture does not match compiled ISA (RISCV).");
702 switch (obj_file->getOpSys()) {
703 case ObjectFile::UnknownOpSys:
704 warn("Unknown operating system; assuming Linux.");
705 // fall through
706 case ObjectFile::Linux:
707 if (arch == ObjectFile::Riscv64) {
708 process = new RiscvLinuxProcess64(this, obj_file);
709 } else {
710 process = new RiscvLinuxProcess32(this, obj_file);
711 }
712 break;
713 default:
714 fatal("Unknown/unsupported operating system.");
715 }
716#else
717#error "THE_ISA not set"
718#endif
719
720 if (process == nullptr)
721 fatal("Unknown error creating process object.");
722 return process;
723}
|