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33 #include "arch/mips/isa_traits.hh"
34 #include "arch/mips/process.hh"
35 #include "base/loader/elf_object.hh"
36 #include "base/loader/object_file.hh"
37 #include "base/misc.hh"
38 #include "cpu/thread_context.hh"
39 #include "debug/Loader.hh"
40 #include "mem/page_table.hh"
41 #include "sim/process.hh"
42 #include "sim/process_impl.hh"
43 #include "sim/system.hh"
46 using namespace MipsISA
;
48 MipsLiveProcess::MipsLiveProcess(LiveProcessParams
* params
,
50 : LiveProcess(params
, objFile
)
52 // Set up stack. On MIPS, stack starts at the top of kuseg
53 // user address space. MIPS stack grows down from here
54 stack_base
= 0x7FFFFFFF;
56 // Set pointer for next thread stack. Reserve 8M for main stack.
57 next_thread_stack_base
= stack_base
- (8 * 1024 * 1024);
59 // Set up break point (Top of Heap)
60 brk_point
= objFile
->dataBase() + objFile
->dataSize() + objFile
->bssSize();
61 brk_point
= roundUp(brk_point
, PageBytes
);
63 // Set up region for mmaps. Start it 1GB above the top of the heap.
64 mmap_end
= brk_point
+ 0x40000000L
;
68 MipsLiveProcess::initState()
70 LiveProcess::initState();
72 argsInit
<uint32_t>(PageBytes
);
75 template<class IntType
>
77 MipsLiveProcess::argsInit(int pageSize
)
79 int intSize
= sizeof(IntType
);
81 // Patch the ld_bias for dynamic executables.
84 // load object file into target memory
85 objFile
->loadSections(initVirtMem
);
87 typedef AuxVector
<IntType
> auxv_t
;
88 std::vector
<auxv_t
> auxv
;
90 ElfObject
* elfObject
= dynamic_cast<ElfObject
*>(objFile
);
93 // Set the system page size
94 auxv
.push_back(auxv_t(M5_AT_PAGESZ
, MipsISA::PageBytes
));
95 // Set the frequency at which time() increments
96 auxv
.push_back(auxv_t(M5_AT_CLKTCK
, 100));
97 // For statically linked executables, this is the virtual
98 // address of the program header tables if they appear in the
100 auxv
.push_back(auxv_t(M5_AT_PHDR
, elfObject
->programHeaderTable()));
101 DPRINTF(Loader
, "auxv at PHDR %08p\n", elfObject
->programHeaderTable());
102 // This is the size of a program header entry from the elf file.
103 auxv
.push_back(auxv_t(M5_AT_PHENT
, elfObject
->programHeaderSize()));
104 // This is the number of program headers from the original elf file.
105 auxv
.push_back(auxv_t(M5_AT_PHNUM
, elfObject
->programHeaderCount()));
106 // This is the base address of the ELF interpreter; it should be
107 // zero for static executables or contain the base address for
108 // dynamic executables.
109 auxv
.push_back(auxv_t(M5_AT_BASE
, getBias()));
110 //The entry point to the program
111 auxv
.push_back(auxv_t(M5_AT_ENTRY
, objFile
->entryPoint()));
112 //Different user and group IDs
113 auxv
.push_back(auxv_t(M5_AT_UID
, uid()));
114 auxv
.push_back(auxv_t(M5_AT_EUID
, euid()));
115 auxv
.push_back(auxv_t(M5_AT_GID
, gid()));
116 auxv
.push_back(auxv_t(M5_AT_EGID
, egid()));
119 // Calculate how much space we need for arg & env & auxv arrays.
120 int argv_array_size
= intSize
* (argv
.size() + 1);
121 int envp_array_size
= intSize
* (envp
.size() + 1);
122 int auxv_array_size
= intSize
* 2 * (auxv
.size() + 1);
124 int arg_data_size
= 0;
125 for (vector
<string
>::size_type i
= 0; i
< argv
.size(); ++i
) {
126 arg_data_size
+= argv
[i
].size() + 1;
128 int env_data_size
= 0;
129 for (vector
<string
>::size_type i
= 0; i
< envp
.size(); ++i
) {
130 env_data_size
+= envp
[i
].size() + 1;
140 // set bottom of stack
141 stack_min
= stack_base
- space_needed
;
143 stack_min
= roundDown(stack_min
, pageSize
);
144 stack_size
= stack_base
- stack_min
;
146 allocateMem(stack_min
, roundUp(stack_size
, pageSize
));
148 // map out initial stack contents
149 IntType argv_array_base
= stack_min
+ intSize
; // room for argc
150 IntType envp_array_base
= argv_array_base
+ argv_array_size
;
151 IntType auxv_array_base
= envp_array_base
+ envp_array_size
;
152 IntType arg_data_base
= auxv_array_base
+ auxv_array_size
;
153 IntType env_data_base
= arg_data_base
+ arg_data_size
;
155 // write contents to stack
156 IntType argc
= argv
.size();
158 argc
= htog((IntType
)argc
);
160 initVirtMem
.writeBlob(stack_min
, (uint8_t*)&argc
, intSize
);
162 copyStringArray(argv
, argv_array_base
, arg_data_base
, initVirtMem
);
164 copyStringArray(envp
, envp_array_base
, env_data_base
, initVirtMem
);
166 // Copy the aux vector
167 for (typename vector
<auxv_t
>::size_type x
= 0; x
< auxv
.size(); x
++) {
168 initVirtMem
.writeBlob(auxv_array_base
+ x
* 2 * intSize
,
169 (uint8_t*)&(auxv
[x
].a_type
), intSize
);
170 initVirtMem
.writeBlob(auxv_array_base
+ (x
* 2 + 1) * intSize
,
171 (uint8_t*)&(auxv
[x
].a_val
), intSize
);
174 // Write out the terminating zeroed auxilliary vector
175 for (unsigned i
= 0; i
< 2; i
++) {
176 const IntType zero
= 0;
177 const Addr addr
= auxv_array_base
+ 2 * intSize
* (auxv
.size() + i
);
178 initVirtMem
.writeBlob(addr
, (uint8_t*)&zero
, intSize
);
181 ThreadContext
*tc
= system
->getThreadContext(contextIds
[0]);
183 setSyscallArg(tc
, 0, argc
);
184 setSyscallArg(tc
, 1, argv_array_base
);
185 tc
->setIntReg(StackPointerReg
, stack_min
);
187 tc
->pcState(getStartPC());
192 MipsLiveProcess::getSyscallArg(ThreadContext
*tc
, int &i
)
195 return tc
->readIntReg(FirstArgumentReg
+ i
++);
199 MipsLiveProcess::setSyscallArg(ThreadContext
*tc
,
200 int i
, MipsISA::IntReg val
)
203 tc
->setIntReg(FirstArgumentReg
+ i
, val
);
207 MipsLiveProcess::setSyscallReturn(ThreadContext
*tc
, SyscallReturn sysret
)
209 if (sysret
.successful()) {
211 tc
->setIntReg(SyscallSuccessReg
, 0);
212 tc
->setIntReg(ReturnValueReg
, sysret
.returnValue());
214 // got an error, return details
215 tc
->setIntReg(SyscallSuccessReg
, (IntReg
) -1);
216 tc
->setIntReg(ReturnValueReg
, sysret
.errnoValue());