2 * Copyright (c) 2003-2006 The Regents of The University of Michigan
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80 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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89 #include "arch/x86/isa_traits.hh"
90 #include "arch/x86/process.hh"
91 #include "arch/x86/segmentregs.hh"
92 #include "arch/x86/types.hh"
93 #include "base/loader/object_file.hh"
94 #include "base/loader/elf_object.hh"
95 #include "base/misc.hh"
96 #include "base/trace.hh"
97 #include "cpu/thread_context.hh"
98 #include "mem/page_table.hh"
99 #include "mem/translating_port.hh"
100 #include "sim/process_impl.hh"
101 #include "sim/system.hh"
104 using namespace X86ISA
;
106 M5_64_auxv_t::M5_64_auxv_t(int64_t type
, int64_t val
)
108 a_type
= TheISA::htog(type
);
109 a_val
= TheISA::htog(val
);
112 X86LiveProcess::X86LiveProcess(LiveProcessParams
* params
,
114 : LiveProcess(params
, objFile
)
116 brk_point
= objFile
->dataBase() + objFile
->dataSize() + objFile
->bssSize();
117 brk_point
= roundUp(brk_point
, VMPageSize
);
119 // Set pointer for next thread stack. Reserve 8M for main stack.
120 next_thread_stack_base
= stack_base
- (8 * 1024 * 1024);
122 // Set up stack. On X86_64 Linux, stack goes from the top of memory
123 // downward, less the hole for the kernel address space plus one page
124 // for undertermined purposes.
125 stack_base
= (Addr
)0x7FFFFFFFF000ULL
;
127 // Set up region for mmaps. This was determined empirically and may not
128 // always be correct.
129 mmap_start
= mmap_end
= 0x2aaaaaaab000;
132 void X86LiveProcess::handleTrap(int trapNum
, ThreadContext
*tc
)
137 panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum
);
142 X86LiveProcess::startup()
144 argsInit(sizeof(IntReg
), VMPageSize
);
146 for (int i
= 0; i
< threadContexts
.size(); i
++) {
147 ThreadContext
* tc
= threadContexts
[i
];
149 SegAttr dataAttr
= 0;
150 dataAttr
.writable
= 1;
151 dataAttr
.readable
= 1;
152 dataAttr
.expandDown
= 0;
154 dataAttr
.defaultSize
= 0;
155 dataAttr
.longMode
= 1;
157 //Initialize the segment registers.
158 for(int seg
= 0; seg
< NUM_SEGMENTREGS
; seg
++) {
159 tc
->setMiscRegNoEffect(MISCREG_SEG_BASE(seg
), 0);
160 tc
->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg
), dataAttr
);
166 csAttr
.expandDown
= 0;
168 csAttr
.defaultSize
= 0;
171 tc
->setMiscRegNoEffect(MISCREG_CS_ATTR
, csAttr
);
173 //Set up the registers that describe the operating mode.
175 cr0
.pg
= 1; // Turn on paging.
176 cr0
.cd
= 0; // Don't disable caching.
177 cr0
.nw
= 0; // This is bit is defined to be ignored.
178 cr0
.am
= 0; // No alignment checking
179 cr0
.wp
= 0; // Supervisor mode can write read only pages
181 cr0
.et
= 1; // This should always be 1
182 cr0
.ts
= 0; // We don't do task switching, so causing fp exceptions
183 // would be pointless.
184 cr0
.em
= 0; // Allow x87 instructions to execute natively.
185 cr0
.mp
= 1; // This doesn't really matter, but the manual suggests
186 // setting it to one.
187 cr0
.pe
= 1; // We're definitely in protected mode.
188 tc
->setMiscReg(MISCREG_CR0
, cr0
);
191 efer
.sce
= 1; // Enable system call extensions.
192 efer
.lme
= 1; // Enable long mode.
193 efer
.lma
= 1; // Activate long mode.
194 efer
.nxe
= 1; // Enable nx support.
195 efer
.svme
= 0; // Disable svm support for now. It isn't implemented.
196 efer
.ffxsr
= 1; // Turn on fast fxsave and fxrstor.
197 tc
->setMiscReg(MISCREG_EFER
, efer
);
202 X86LiveProcess::argsInit(int intSize
, int pageSize
)
204 typedef M5_64_auxv_t auxv_t
;
213 //We want 16 byte alignment
216 // load object file into target memory
217 objFile
->loadSections(initVirtMem
);
220 X86_OnboardFPU
= 1 << 0,
221 X86_VirtualModeExtensions
= 1 << 1,
222 X86_DebuggingExtensions
= 1 << 2,
223 X86_PageSizeExtensions
= 1 << 3,
225 X86_TimeStampCounter
= 1 << 4,
226 X86_ModelSpecificRegisters
= 1 << 5,
227 X86_PhysicalAddressExtensions
= 1 << 6,
228 X86_MachineCheckExtensions
= 1 << 7,
230 X86_CMPXCHG8Instruction
= 1 << 8,
231 X86_OnboardAPIC
= 1 << 9,
232 X86_SYSENTER_SYSEXIT
= 1 << 11,
234 X86_MemoryTypeRangeRegisters
= 1 << 12,
235 X86_PageGlobalEnable
= 1 << 13,
236 X86_MachineCheckArchitecture
= 1 << 14,
237 X86_CMOVInstruction
= 1 << 15,
239 X86_PageAttributeTable
= 1 << 16,
240 X86_36BitPSEs
= 1 << 17,
241 X86_ProcessorSerialNumber
= 1 << 18,
242 X86_CLFLUSHInstruction
= 1 << 19,
244 X86_DebugTraceStore
= 1 << 21,
245 X86_ACPIViaMSR
= 1 << 22,
246 X86_MultimediaExtensions
= 1 << 23,
248 X86_FXSAVE_FXRSTOR
= 1 << 24,
249 X86_StreamingSIMDExtensions
= 1 << 25,
250 X86_StreamingSIMDExtensions2
= 1 << 26,
251 X86_CPUSelfSnoop
= 1 << 27,
253 X86_HyperThreading
= 1 << 28,
254 X86_AutomaticClockControl
= 1 << 29,
255 X86_IA64Processor
= 1 << 30
258 //Setup the auxilliary vectors. These will already have endian conversion.
259 //Auxilliary vectors are loaded only for elf formatted executables.
260 ElfObject
* elfObject
= dynamic_cast<ElfObject
*>(objFile
);
265 X86_VirtualModeExtensions
|
266 X86_DebuggingExtensions
|
267 X86_PageSizeExtensions
|
268 X86_TimeStampCounter
|
269 X86_ModelSpecificRegisters
|
270 X86_PhysicalAddressExtensions
|
271 X86_MachineCheckExtensions
|
272 X86_CMPXCHG8Instruction
|
274 X86_SYSENTER_SYSEXIT
|
275 X86_MemoryTypeRangeRegisters
|
276 X86_PageGlobalEnable
|
277 X86_MachineCheckArchitecture
|
278 X86_CMOVInstruction
|
279 X86_PageAttributeTable
|
281 // X86_ProcessorSerialNumber |
282 X86_CLFLUSHInstruction
|
283 // X86_DebugTraceStore |
285 X86_MultimediaExtensions
|
287 X86_StreamingSIMDExtensions
|
288 X86_StreamingSIMDExtensions2
|
289 // X86_CPUSelfSnoop |
290 // X86_HyperThreading |
291 // X86_AutomaticClockControl |
292 // X86_IA64Processor |
295 //Bits which describe the system hardware capabilities
296 //XXX Figure out what these should be
297 auxv
.push_back(auxv_t(M5_AT_HWCAP
, features
));
298 //The system page size
299 auxv
.push_back(auxv_t(M5_AT_PAGESZ
, X86ISA::VMPageSize
));
300 //Frequency at which times() increments
301 auxv
.push_back(auxv_t(M5_AT_CLKTCK
, 100));
302 // For statically linked executables, this is the virtual address of the
303 // program header tables if they appear in the executable image
304 auxv
.push_back(auxv_t(M5_AT_PHDR
, elfObject
->programHeaderTable()));
305 // This is the size of a program header entry from the elf file.
306 auxv
.push_back(auxv_t(M5_AT_PHENT
, elfObject
->programHeaderSize()));
307 // This is the number of program headers from the original elf file.
308 auxv
.push_back(auxv_t(M5_AT_PHNUM
, elfObject
->programHeaderCount()));
309 //Defined to be 100 in the kernel source.
310 //This is the address of the elf "interpreter", It should be set
311 //to 0 for regular executables. It should be something else
312 //(not sure what) for dynamic libraries.
313 auxv
.push_back(auxv_t(M5_AT_BASE
, 0));
315 //XXX Figure out what this should be.
316 auxv
.push_back(auxv_t(M5_AT_FLAGS
, 0));
317 //The entry point to the program
318 auxv
.push_back(auxv_t(M5_AT_ENTRY
, objFile
->entryPoint()));
319 //Different user and group IDs
320 auxv
.push_back(auxv_t(M5_AT_UID
, uid()));
321 auxv
.push_back(auxv_t(M5_AT_EUID
, euid()));
322 auxv
.push_back(auxv_t(M5_AT_GID
, gid()));
323 auxv
.push_back(auxv_t(M5_AT_EGID
, egid()));
324 //Whether to enable "secure mode" in the executable
325 auxv
.push_back(auxv_t(M5_AT_SECURE
, 0));
326 //The string "x86_64" with unknown meaning
327 auxv
.push_back(auxv_t(M5_AT_PLATFORM
, 0));
330 //Figure out how big the initial stack needs to be
332 // A sentry NULL void pointer at the top of the stack.
333 int sentry_size
= intSize
;
335 //This is the name of the file which is present on the initial stack
336 //It's purpose is to let the user space linker examine the original file.
337 int file_name_size
= filename
.size() + 1;
339 string platform
= "x86_64";
340 int aux_data_size
= platform
.size() + 1;
342 int env_data_size
= 0;
343 for (int i
= 0; i
< envp
.size(); ++i
) {
344 env_data_size
+= envp
[i
].size() + 1;
346 int arg_data_size
= 0;
347 for (int i
= 0; i
< argv
.size(); ++i
) {
348 arg_data_size
+= argv
[i
].size() + 1;
351 //The info_block needs to be padded so it's size is a multiple of the
352 //alignment mask. Also, it appears that there needs to be at least some
353 //padding, so if the size is already a multiple, we need to increase it
355 int base_info_block_size
=
356 sentry_size
+ file_name_size
+ env_data_size
+ arg_data_size
;
358 int info_block_size
= roundUp(base_info_block_size
, align
);
360 int info_block_padding
= info_block_size
- base_info_block_size
;
362 //Each auxilliary vector is two 8 byte words
363 int aux_array_size
= intSize
* 2 * (auxv
.size() + 1);
365 int envp_array_size
= intSize
* (envp
.size() + 1);
366 int argv_array_size
= intSize
* (argv
.size() + 1);
368 int argc_size
= intSize
;
370 //Figure out the size of the contents of the actual initial frame
377 //There needs to be padding after the auxiliary vector data so that the
378 //very bottom of the stack is aligned properly.
379 int partial_size
= frame_size
+ aux_data_size
;
380 int aligned_partial_size
= roundUp(partial_size
, align
);
381 int aux_padding
= aligned_partial_size
- partial_size
;
389 stack_min
= stack_base
- space_needed
;
390 stack_min
= roundDown(stack_min
, align
);
391 stack_size
= stack_base
- stack_min
;
394 pTable
->allocate(roundDown(stack_min
, pageSize
),
395 roundUp(stack_size
, pageSize
));
397 // map out initial stack contents
398 Addr sentry_base
= stack_base
- sentry_size
;
399 Addr file_name_base
= sentry_base
- file_name_size
;
400 Addr env_data_base
= file_name_base
- env_data_size
;
401 Addr arg_data_base
= env_data_base
- arg_data_size
;
402 Addr aux_data_base
= arg_data_base
- info_block_padding
- aux_data_size
;
403 Addr auxv_array_base
= aux_data_base
- aux_array_size
- aux_padding
;
404 Addr envp_array_base
= auxv_array_base
- envp_array_size
;
405 Addr argv_array_base
= envp_array_base
- argv_array_size
;
406 Addr argc_base
= argv_array_base
- argc_size
;
408 DPRINTF(X86
, "The addresses of items on the initial stack:\n");
409 DPRINTF(X86
, "0x%x - file name\n", file_name_base
);
410 DPRINTF(X86
, "0x%x - env data\n", env_data_base
);
411 DPRINTF(X86
, "0x%x - arg data\n", arg_data_base
);
412 DPRINTF(X86
, "0x%x - aux data\n", aux_data_base
);
413 DPRINTF(X86
, "0x%x - auxv array\n", auxv_array_base
);
414 DPRINTF(X86
, "0x%x - envp array\n", envp_array_base
);
415 DPRINTF(X86
, "0x%x - argv array\n", argv_array_base
);
416 DPRINTF(X86
, "0x%x - argc \n", argc_base
);
417 DPRINTF(X86
, "0x%x - stack min\n", stack_min
);
419 // write contents to stack
422 uint64_t argc
= argv
.size();
423 uint64_t guestArgc
= TheISA::htog(argc
);
425 //Write out the sentry void *
426 uint64_t sentry_NULL
= 0;
427 initVirtMem
->writeBlob(sentry_base
,
428 (uint8_t*)&sentry_NULL
, sentry_size
);
430 //Write the file name
431 initVirtMem
->writeString(file_name_base
, filename
.c_str());
433 //Fix up the aux vector which points to the "platform" string
434 assert(auxv
[auxv
.size() - 1].a_type
= M5_AT_PLATFORM
);
435 auxv
[auxv
.size() - 1].a_val
= aux_data_base
;
438 for(int x
= 0; x
< auxv
.size(); x
++)
440 initVirtMem
->writeBlob(auxv_array_base
+ x
* 2 * intSize
,
441 (uint8_t*)&(auxv
[x
].a_type
), intSize
);
442 initVirtMem
->writeBlob(auxv_array_base
+ (x
* 2 + 1) * intSize
,
443 (uint8_t*)&(auxv
[x
].a_val
), intSize
);
445 //Write out the terminating zeroed auxilliary vector
446 const uint64_t zero
= 0;
447 initVirtMem
->writeBlob(auxv_array_base
+ 2 * intSize
* auxv
.size(),
448 (uint8_t*)&zero
, 2 * intSize
);
450 initVirtMem
->writeString(aux_data_base
, platform
.c_str());
452 copyStringArray(envp
, envp_array_base
, env_data_base
, initVirtMem
);
453 copyStringArray(argv
, argv_array_base
, arg_data_base
, initVirtMem
);
455 initVirtMem
->writeBlob(argc_base
, (uint8_t*)&guestArgc
, intSize
);
457 //Set the stack pointer register
458 threadContexts
[0]->setIntReg(StackPointerReg
, stack_min
);
460 Addr prog_entry
= objFile
->entryPoint();
461 threadContexts
[0]->setPC(prog_entry
);
462 threadContexts
[0]->setNextPC(prog_entry
+ sizeof(MachInst
));
464 //Align the "stack_min" to a page boundary.
465 stack_min
= roundDown(stack_min
, pageSize
);