1/*
2 * Copyright (c) 2007-2008 The Florida State University
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Stephen Hines
29 */
30
31#include "arch/arm/isa_traits.hh"
32#include "arch/arm/process.hh"
33#include "arch/arm/types.hh"
34#include "base/loader/elf_object.hh"
35#include "base/loader/object_file.hh"
36#include "base/misc.hh"
37#include "cpu/thread_context.hh"
38#include "mem/page_table.hh"
39#include "mem/translating_port.hh"
40#include "sim/process_impl.hh"
41#include "sim/system.hh"
42
43using namespace std;
44using namespace ArmISA;
45
46ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile,
47 ObjectFile::Arch _arch)
48 : LiveProcess(params, objFile), arch(_arch)
49{
50 stack_base = 0xbf000000L;
51
52 // Set pointer for next thread stack. Reserve 8M for main stack.
53 next_thread_stack_base = stack_base - (8 * 1024 * 1024);
54
55 // Set up break point (Top of Heap)
56 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
57 brk_point = roundUp(brk_point, VMPageSize);
58
59 // Set up region for mmaps. For now, start at bottom of kuseg space.
| 1/*
2 * Copyright (c) 2007-2008 The Florida State University
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Stephen Hines
29 */
30
31#include "arch/arm/isa_traits.hh"
32#include "arch/arm/process.hh"
33#include "arch/arm/types.hh"
34#include "base/loader/elf_object.hh"
35#include "base/loader/object_file.hh"
36#include "base/misc.hh"
37#include "cpu/thread_context.hh"
38#include "mem/page_table.hh"
39#include "mem/translating_port.hh"
40#include "sim/process_impl.hh"
41#include "sim/system.hh"
42
43using namespace std;
44using namespace ArmISA;
45
46ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile,
47 ObjectFile::Arch _arch)
48 : LiveProcess(params, objFile), arch(_arch)
49{
50 stack_base = 0xbf000000L;
51
52 // Set pointer for next thread stack. Reserve 8M for main stack.
53 next_thread_stack_base = stack_base - (8 * 1024 * 1024);
54
55 // Set up break point (Top of Heap)
56 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
57 brk_point = roundUp(brk_point, VMPageSize);
58
59 // Set up region for mmaps. For now, start at bottom of kuseg space.
|
61}
62
63void
64ArmLiveProcess::startup()
65{
66 argsInit(MachineBytes, VMPageSize);
67}
68
69void
70ArmLiveProcess::copyStringArray32(std::vector<std::string> &strings,
71 Addr array_ptr, Addr data_ptr,
72 TranslatingPort* memPort)
73{
74 Addr data_ptr_swap;
75 for (int i = 0; i < strings.size(); ++i) {
76 data_ptr_swap = htog(data_ptr);
77 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap,
78 sizeof(uint32_t));
79 memPort->writeString(data_ptr, strings[i].c_str());
80 array_ptr += sizeof(uint32_t);
81 data_ptr += strings[i].size() + 1;
82 }
83 // add NULL terminator
84 data_ptr = 0;
85
86 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(uint32_t));
87}
88
89void
90ArmLiveProcess::argsInit(int intSize, int pageSize)
91{
92 typedef AuxVector<uint32_t> auxv_t;
93 std::vector<auxv_t> auxv;
94
95 string filename;
96 if (argv.size() < 1)
97 filename = "";
98 else
99 filename = argv[0];
100
101 //We want 16 byte alignment
102 uint64_t align = 16;
103
104 // Overloaded argsInit so that we can fine-tune for ARM architecture
105 Process::startup();
106
107 // load object file into target memory
108 objFile->loadSections(initVirtMem);
109
110 enum ArmCpuFeature {
111 Arm_Swp = 1 << 0,
112 Arm_Half = 1 << 1,
113 Arm_Thumb = 1 << 2,
114 Arm_26Bit = 1 << 3,
115 Arm_FastMult = 1 << 4,
116 Arm_Fpa = 1 << 5,
117 Arm_Vfp = 1 << 6,
118 Arm_Edsp = 1 << 7,
119 Arm_Java = 1 << 8,
120 Arm_Iwmmxt = 1 << 9,
121 Arm_Crunch = 1 << 10
122 };
123
124 //Setup the auxilliary vectors. These will already have endian conversion.
125 //Auxilliary vectors are loaded only for elf formatted executables.
126 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
127 if (elfObject) {
128 uint32_t features =
129 Arm_Swp |
130 Arm_Half |
131 Arm_Thumb |
132// Arm_26Bit |
133 Arm_FastMult |
134// Arm_Fpa |
135 Arm_Vfp |
136 Arm_Edsp |
137 Arm_Java |
138// Arm_Iwmmxt |
139// Arm_Crunch |
140 0;
141
142 //Bits which describe the system hardware capabilities
143 //XXX Figure out what these should be
144 auxv.push_back(auxv_t(M5_AT_HWCAP, features));
145 //The system page size
146 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::VMPageSize));
147 //Frequency at which times() increments
148 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64));
149 // For statically linked executables, this is the virtual address of the
150 // program header tables if they appear in the executable image
151 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
152 // This is the size of a program header entry from the elf file.
153 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
154 // This is the number of program headers from the original elf file.
155 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
156 //This is the address of the elf "interpreter", It should be set
157 //to 0 for regular executables. It should be something else
158 //(not sure what) for dynamic libraries.
159 auxv.push_back(auxv_t(M5_AT_BASE, 0));
160
161 //XXX Figure out what this should be.
162 auxv.push_back(auxv_t(M5_AT_FLAGS, 0));
163 //The entry point to the program
164 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
165 //Different user and group IDs
166 auxv.push_back(auxv_t(M5_AT_UID, uid()));
167 auxv.push_back(auxv_t(M5_AT_EUID, euid()));
168 auxv.push_back(auxv_t(M5_AT_GID, gid()));
169 auxv.push_back(auxv_t(M5_AT_EGID, egid()));
170 //Whether to enable "secure mode" in the executable
171 auxv.push_back(auxv_t(M5_AT_SECURE, 0));
172 //The filename of the program
173 auxv.push_back(auxv_t(M5_AT_EXECFN, 0));
174 //The string "v51" with unknown meaning
175 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0));
176 }
177
178 //Figure out how big the initial stack nedes to be
179
180 // A sentry NULL void pointer at the top of the stack.
181 int sentry_size = intSize;
182
183 string platform = "v51";
184 int platform_size = platform.size() + 1;
185
186 // The aux vectors are put on the stack in two groups. The first group are
187 // the vectors that are generated as the elf is loaded. The second group
188 // are the ones that were computed ahead of time and include the platform
189 // string.
190 int aux_data_size = filename.size() + 1;
191
192 int env_data_size = 0;
193 for (int i = 0; i < envp.size(); ++i) {
194 env_data_size += envp[i].size() + 1;
195 }
196 int arg_data_size = 0;
197 for (int i = 0; i < argv.size(); ++i) {
198 arg_data_size += argv[i].size() + 1;
199 }
200
201 int info_block_size =
202 sentry_size + env_data_size + arg_data_size +
203 aux_data_size + platform_size;
204
205 //Each auxilliary vector is two 4 byte words
206 int aux_array_size = intSize * 2 * (auxv.size() + 1);
207
208 int envp_array_size = intSize * (envp.size() + 1);
209 int argv_array_size = intSize * (argv.size() + 1);
210
211 int argc_size = intSize;
212
213 //Figure out the size of the contents of the actual initial frame
214 int frame_size =
215 info_block_size +
216 aux_array_size +
217 envp_array_size +
218 argv_array_size +
219 argc_size;
220
221 //There needs to be padding after the auxiliary vector data so that the
222 //very bottom of the stack is aligned properly.
223 int partial_size = frame_size;
224 int aligned_partial_size = roundUp(partial_size, align);
225 int aux_padding = aligned_partial_size - partial_size;
226
227 int space_needed = frame_size + aux_padding;
228
229 stack_min = stack_base - space_needed;
230 stack_min = roundDown(stack_min, align);
231 stack_size = stack_base - stack_min;
232
233 // map memory
234 pTable->allocate(roundDown(stack_min, pageSize),
235 roundUp(stack_size, pageSize));
236
237 // map out initial stack contents
238 uint32_t sentry_base = stack_base - sentry_size;
239 uint32_t aux_data_base = sentry_base - aux_data_size;
240 uint32_t env_data_base = aux_data_base - env_data_size;
241 uint32_t arg_data_base = env_data_base - arg_data_size;
242 uint32_t platform_base = arg_data_base - platform_size;
243 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding;
244 uint32_t envp_array_base = auxv_array_base - envp_array_size;
245 uint32_t argv_array_base = envp_array_base - argv_array_size;
246 uint32_t argc_base = argv_array_base - argc_size;
247
248 DPRINTF(Stack, "The addresses of items on the initial stack:\n");
249 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base);
250 DPRINTF(Stack, "0x%x - env data\n", env_data_base);
251 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base);
252 DPRINTF(Stack, "0x%x - platform base\n", platform_base);
253 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base);
254 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
255 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
256 DPRINTF(Stack, "0x%x - argc \n", argc_base);
257 DPRINTF(Stack, "0x%x - stack min\n", stack_min);
258
259 // write contents to stack
260
261 // figure out argc
262 uint32_t argc = argv.size();
263 uint32_t guestArgc = ArmISA::htog(argc);
264
265 //Write out the sentry void *
266 uint32_t sentry_NULL = 0;
267 initVirtMem->writeBlob(sentry_base,
268 (uint8_t*)&sentry_NULL, sentry_size);
269
270 //Fix up the aux vectors which point to other data
271 for (int i = auxv.size() - 1; i >= 0; i--) {
272 if (auxv[i].a_type == M5_AT_PLATFORM) {
273 auxv[i].a_val = platform_base;
274 initVirtMem->writeString(platform_base, platform.c_str());
275 } else if (auxv[i].a_type == M5_AT_EXECFN) {
276 auxv[i].a_val = aux_data_base;
277 initVirtMem->writeString(aux_data_base, filename.c_str());
278 }
279 }
280
281 //Copy the aux stuff
282 for(int x = 0; x < auxv.size(); x++)
283 {
284 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
285 (uint8_t*)&(auxv[x].a_type), intSize);
286 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
287 (uint8_t*)&(auxv[x].a_val), intSize);
288 }
289 //Write out the terminating zeroed auxilliary vector
290 const uint64_t zero = 0;
291 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
292 (uint8_t*)&zero, 2 * intSize);
293
294 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
295 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
296
297 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
298
299 ThreadContext *tc = system->getThreadContext(contextIds[0]);
300 //Set the stack pointer register
301 tc->setIntReg(StackPointerReg, stack_min);
302 //A pointer to a function to run when the program exits. We'll set this
303 //to zero explicitly to make sure this isn't used.
304 tc->setIntReg(ArgumentReg0, 0);
305 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively
306 if (argv.size() > 0) {
307 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size -
308 argv[argv.size() - 1].size() - 1);
309 } else {
310 tc->setIntReg(ArgumentReg1, 0);
311 }
312 if (envp.size() > 0) {
313 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size -
314 envp[envp.size() - 1].size() - 1);
315 } else {
316 tc->setIntReg(ArgumentReg2, 0);
317 }
318
319 Addr prog_entry = objFile->entryPoint();
320 if (arch == ObjectFile::Thumb)
321 prog_entry = (prog_entry & ~mask(1)) | (ULL(1) << PcTBitShift);
322 tc->setPC(prog_entry);
323 tc->setNextPC(prog_entry + sizeof(MachInst));
324
325 //Align the "stack_min" to a page boundary.
326 stack_min = roundDown(stack_min, pageSize);
327}
328
329ArmISA::IntReg
330ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i)
331{
332 assert(i < 4);
333 return tc->readIntReg(ArgumentReg0 + i++);
334}
335
336void
337ArmLiveProcess::setSyscallArg(ThreadContext *tc,
338 int i, ArmISA::IntReg val)
339{
340 assert(i < 4);
341 tc->setIntReg(ArgumentReg0 + i, val);
342}
343
344void
345ArmLiveProcess::setSyscallReturn(ThreadContext *tc,
346 SyscallReturn return_value)
347{
348 tc->setIntReg(ReturnValueReg, return_value.value());
349}
| 61}
62
63void
64ArmLiveProcess::startup()
65{
66 argsInit(MachineBytes, VMPageSize);
67}
68
69void
70ArmLiveProcess::copyStringArray32(std::vector<std::string> &strings,
71 Addr array_ptr, Addr data_ptr,
72 TranslatingPort* memPort)
73{
74 Addr data_ptr_swap;
75 for (int i = 0; i < strings.size(); ++i) {
76 data_ptr_swap = htog(data_ptr);
77 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap,
78 sizeof(uint32_t));
79 memPort->writeString(data_ptr, strings[i].c_str());
80 array_ptr += sizeof(uint32_t);
81 data_ptr += strings[i].size() + 1;
82 }
83 // add NULL terminator
84 data_ptr = 0;
85
86 memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(uint32_t));
87}
88
89void
90ArmLiveProcess::argsInit(int intSize, int pageSize)
91{
92 typedef AuxVector<uint32_t> auxv_t;
93 std::vector<auxv_t> auxv;
94
95 string filename;
96 if (argv.size() < 1)
97 filename = "";
98 else
99 filename = argv[0];
100
101 //We want 16 byte alignment
102 uint64_t align = 16;
103
104 // Overloaded argsInit so that we can fine-tune for ARM architecture
105 Process::startup();
106
107 // load object file into target memory
108 objFile->loadSections(initVirtMem);
109
110 enum ArmCpuFeature {
111 Arm_Swp = 1 << 0,
112 Arm_Half = 1 << 1,
113 Arm_Thumb = 1 << 2,
114 Arm_26Bit = 1 << 3,
115 Arm_FastMult = 1 << 4,
116 Arm_Fpa = 1 << 5,
117 Arm_Vfp = 1 << 6,
118 Arm_Edsp = 1 << 7,
119 Arm_Java = 1 << 8,
120 Arm_Iwmmxt = 1 << 9,
121 Arm_Crunch = 1 << 10
122 };
123
124 //Setup the auxilliary vectors. These will already have endian conversion.
125 //Auxilliary vectors are loaded only for elf formatted executables.
126 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
127 if (elfObject) {
128 uint32_t features =
129 Arm_Swp |
130 Arm_Half |
131 Arm_Thumb |
132// Arm_26Bit |
133 Arm_FastMult |
134// Arm_Fpa |
135 Arm_Vfp |
136 Arm_Edsp |
137 Arm_Java |
138// Arm_Iwmmxt |
139// Arm_Crunch |
140 0;
141
142 //Bits which describe the system hardware capabilities
143 //XXX Figure out what these should be
144 auxv.push_back(auxv_t(M5_AT_HWCAP, features));
145 //The system page size
146 auxv.push_back(auxv_t(M5_AT_PAGESZ, ArmISA::VMPageSize));
147 //Frequency at which times() increments
148 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64));
149 // For statically linked executables, this is the virtual address of the
150 // program header tables if they appear in the executable image
151 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
152 // This is the size of a program header entry from the elf file.
153 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
154 // This is the number of program headers from the original elf file.
155 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
156 //This is the address of the elf "interpreter", It should be set
157 //to 0 for regular executables. It should be something else
158 //(not sure what) for dynamic libraries.
159 auxv.push_back(auxv_t(M5_AT_BASE, 0));
160
161 //XXX Figure out what this should be.
162 auxv.push_back(auxv_t(M5_AT_FLAGS, 0));
163 //The entry point to the program
164 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
165 //Different user and group IDs
166 auxv.push_back(auxv_t(M5_AT_UID, uid()));
167 auxv.push_back(auxv_t(M5_AT_EUID, euid()));
168 auxv.push_back(auxv_t(M5_AT_GID, gid()));
169 auxv.push_back(auxv_t(M5_AT_EGID, egid()));
170 //Whether to enable "secure mode" in the executable
171 auxv.push_back(auxv_t(M5_AT_SECURE, 0));
172 //The filename of the program
173 auxv.push_back(auxv_t(M5_AT_EXECFN, 0));
174 //The string "v51" with unknown meaning
175 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0));
176 }
177
178 //Figure out how big the initial stack nedes to be
179
180 // A sentry NULL void pointer at the top of the stack.
181 int sentry_size = intSize;
182
183 string platform = "v51";
184 int platform_size = platform.size() + 1;
185
186 // The aux vectors are put on the stack in two groups. The first group are
187 // the vectors that are generated as the elf is loaded. The second group
188 // are the ones that were computed ahead of time and include the platform
189 // string.
190 int aux_data_size = filename.size() + 1;
191
192 int env_data_size = 0;
193 for (int i = 0; i < envp.size(); ++i) {
194 env_data_size += envp[i].size() + 1;
195 }
196 int arg_data_size = 0;
197 for (int i = 0; i < argv.size(); ++i) {
198 arg_data_size += argv[i].size() + 1;
199 }
200
201 int info_block_size =
202 sentry_size + env_data_size + arg_data_size +
203 aux_data_size + platform_size;
204
205 //Each auxilliary vector is two 4 byte words
206 int aux_array_size = intSize * 2 * (auxv.size() + 1);
207
208 int envp_array_size = intSize * (envp.size() + 1);
209 int argv_array_size = intSize * (argv.size() + 1);
210
211 int argc_size = intSize;
212
213 //Figure out the size of the contents of the actual initial frame
214 int frame_size =
215 info_block_size +
216 aux_array_size +
217 envp_array_size +
218 argv_array_size +
219 argc_size;
220
221 //There needs to be padding after the auxiliary vector data so that the
222 //very bottom of the stack is aligned properly.
223 int partial_size = frame_size;
224 int aligned_partial_size = roundUp(partial_size, align);
225 int aux_padding = aligned_partial_size - partial_size;
226
227 int space_needed = frame_size + aux_padding;
228
229 stack_min = stack_base - space_needed;
230 stack_min = roundDown(stack_min, align);
231 stack_size = stack_base - stack_min;
232
233 // map memory
234 pTable->allocate(roundDown(stack_min, pageSize),
235 roundUp(stack_size, pageSize));
236
237 // map out initial stack contents
238 uint32_t sentry_base = stack_base - sentry_size;
239 uint32_t aux_data_base = sentry_base - aux_data_size;
240 uint32_t env_data_base = aux_data_base - env_data_size;
241 uint32_t arg_data_base = env_data_base - arg_data_size;
242 uint32_t platform_base = arg_data_base - platform_size;
243 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding;
244 uint32_t envp_array_base = auxv_array_base - envp_array_size;
245 uint32_t argv_array_base = envp_array_base - argv_array_size;
246 uint32_t argc_base = argv_array_base - argc_size;
247
248 DPRINTF(Stack, "The addresses of items on the initial stack:\n");
249 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base);
250 DPRINTF(Stack, "0x%x - env data\n", env_data_base);
251 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base);
252 DPRINTF(Stack, "0x%x - platform base\n", platform_base);
253 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base);
254 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
255 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
256 DPRINTF(Stack, "0x%x - argc \n", argc_base);
257 DPRINTF(Stack, "0x%x - stack min\n", stack_min);
258
259 // write contents to stack
260
261 // figure out argc
262 uint32_t argc = argv.size();
263 uint32_t guestArgc = ArmISA::htog(argc);
264
265 //Write out the sentry void *
266 uint32_t sentry_NULL = 0;
267 initVirtMem->writeBlob(sentry_base,
268 (uint8_t*)&sentry_NULL, sentry_size);
269
270 //Fix up the aux vectors which point to other data
271 for (int i = auxv.size() - 1; i >= 0; i--) {
272 if (auxv[i].a_type == M5_AT_PLATFORM) {
273 auxv[i].a_val = platform_base;
274 initVirtMem->writeString(platform_base, platform.c_str());
275 } else if (auxv[i].a_type == M5_AT_EXECFN) {
276 auxv[i].a_val = aux_data_base;
277 initVirtMem->writeString(aux_data_base, filename.c_str());
278 }
279 }
280
281 //Copy the aux stuff
282 for(int x = 0; x < auxv.size(); x++)
283 {
284 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
285 (uint8_t*)&(auxv[x].a_type), intSize);
286 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
287 (uint8_t*)&(auxv[x].a_val), intSize);
288 }
289 //Write out the terminating zeroed auxilliary vector
290 const uint64_t zero = 0;
291 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
292 (uint8_t*)&zero, 2 * intSize);
293
294 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
295 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
296
297 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
298
299 ThreadContext *tc = system->getThreadContext(contextIds[0]);
300 //Set the stack pointer register
301 tc->setIntReg(StackPointerReg, stack_min);
302 //A pointer to a function to run when the program exits. We'll set this
303 //to zero explicitly to make sure this isn't used.
304 tc->setIntReg(ArgumentReg0, 0);
305 //Set argument regs 1 and 2 to argv[0] and envp[0] respectively
306 if (argv.size() > 0) {
307 tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size -
308 argv[argv.size() - 1].size() - 1);
309 } else {
310 tc->setIntReg(ArgumentReg1, 0);
311 }
312 if (envp.size() > 0) {
313 tc->setIntReg(ArgumentReg2, env_data_base + env_data_size -
314 envp[envp.size() - 1].size() - 1);
315 } else {
316 tc->setIntReg(ArgumentReg2, 0);
317 }
318
319 Addr prog_entry = objFile->entryPoint();
320 if (arch == ObjectFile::Thumb)
321 prog_entry = (prog_entry & ~mask(1)) | (ULL(1) << PcTBitShift);
322 tc->setPC(prog_entry);
323 tc->setNextPC(prog_entry + sizeof(MachInst));
324
325 //Align the "stack_min" to a page boundary.
326 stack_min = roundDown(stack_min, pageSize);
327}
328
329ArmISA::IntReg
330ArmLiveProcess::getSyscallArg(ThreadContext *tc, int &i)
331{
332 assert(i < 4);
333 return tc->readIntReg(ArgumentReg0 + i++);
334}
335
336void
337ArmLiveProcess::setSyscallArg(ThreadContext *tc,
338 int i, ArmISA::IntReg val)
339{
340 assert(i < 4);
341 tc->setIntReg(ArgumentReg0 + i, val);
342}
343
344void
345ArmLiveProcess::setSyscallReturn(ThreadContext *tc,
346 SyscallReturn return_value)
347{
348 tc->setIntReg(ReturnValueReg, return_value.value());
349}
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