2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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14 * this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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32 #include <sys/signal.h>
34 #include "arch/alpha/ev5.hh"
35 #include "arch/alpha/system.hh"
36 #include "arch/alpha/remote_gdb.hh"
37 #include "arch/vtophys.hh"
38 #include "base/loader/object_file.hh"
39 #include "base/loader/symtab.hh"
40 #include "base/trace.hh"
41 #include "mem/physical.hh"
42 #include "params/AlphaSystem.hh"
43 #include "sim/byteswap.hh"
46 using namespace LittleEndianGuest
;
48 AlphaSystem::AlphaSystem(Params
*p
)
51 consoleSymtab
= new SymbolTable
;
52 palSymtab
= new SymbolTable
;
56 * Load the pal, and console code into memory
59 console
= createObjectFile(params()->console
);
61 fatal("Could not load console file %s", params()->console
);
64 pal
= createObjectFile(params()->pal
);
66 fatal("Could not load PALcode file %s", params()->pal
);
69 // Load program sections into memory
70 pal
->loadSections(&functionalPort
, AlphaISA::LoadAddrMask
);
71 console
->loadSections(&functionalPort
, AlphaISA::LoadAddrMask
);
74 if (!console
->loadGlobalSymbols(consoleSymtab
))
75 panic("could not load console symbols\n");
77 if (!pal
->loadGlobalSymbols(palSymtab
))
78 panic("could not load pal symbols\n");
80 if (!pal
->loadLocalSymbols(palSymtab
))
81 panic("could not load pal symbols\n");
83 if (!console
->loadGlobalSymbols(debugSymbolTable
))
84 panic("could not load console symbols\n");
86 if (!pal
->loadGlobalSymbols(debugSymbolTable
))
87 panic("could not load pal symbols\n");
89 if (!pal
->loadLocalSymbols(debugSymbolTable
))
90 panic("could not load pal symbols\n");
94 consolePanicEvent
= addConsoleFuncEvent
<BreakPCEvent
>("panic");
98 * Copy the osflags (kernel arguments) into the consoles
99 * memory. (Presently Linux does not use the console service
100 * routine to get these command line arguments, but Tru64 and
103 if (consoleSymtab
->findAddress("env_booted_osflags", addr
)) {
104 virtPort
.writeBlob(addr
, (uint8_t*)params()->boot_osflags
.c_str(),
105 strlen(params()->boot_osflags
.c_str()));
109 * Set the hardware reset parameter block system type and revision
110 * information to Tsunami.
112 if (consoleSymtab
->findAddress("m5_rpb", addr
)) {
114 data
= htog(params()->system_type
);
115 virtPort
.write(addr
+0x50, data
);
116 data
= htog(params()->system_rev
);
117 virtPort
.write(addr
+0x58, data
);
119 panic("could not find hwrpb\n");
123 AlphaSystem::~AlphaSystem()
125 delete consoleSymtab
;
129 delete consolePanicEvent
;
134 * This function fixes up addresses that are used to match PCs for
135 * hooking simulator events on to target function executions.
137 * Alpha binaries may have multiple global offset table (GOT)
138 * sections. A function that uses the GOT starts with a
139 * two-instruction prolog which sets the global pointer (gp == r29) to
140 * the appropriate GOT section. The proper gp value is calculated
141 * based on the function address, which must be passed by the caller
142 * in the procedure value register (pv aka t12 == r27). This sequence
143 * looks like the following:
145 * opcode Ra Rb offset
146 * ldah gp,X(pv) 09 29 27 X
147 * lda gp,Y(gp) 08 29 29 Y
149 * for some constant offsets X and Y. The catch is that the linker
150 * (or maybe even the compiler, I'm not sure) may recognize that the
151 * caller and callee are using the same GOT section, making this
152 * prolog redundant, and modify the call target to skip these
153 * instructions. If we check for execution of the first instruction
154 * of a function (the one the symbol points to) to detect when to skip
155 * it, we'll miss all these modified calls. It might work to
156 * unconditionally check for the third instruction, but not all
157 * functions have this prolog, and there's some chance that those
158 * first two instructions could have undesired consequences. So we do
159 * the Right Thing and pattern-match the first two instructions of the
160 * function to decide where to patch.
162 * Eventually this code should be moved into an ISA-specific file.
165 AlphaSystem::fixFuncEventAddr(Addr addr
)
167 // mask for just the opcode, Ra, and Rb fields (not the offset)
168 const uint32_t inst_mask
= 0xffff0000;
169 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
170 const uint32_t gp_ldah_pattern
= (9 << 26) | (29 << 21) | (27 << 16);
171 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29
172 const uint32_t gp_lda_pattern
= (8 << 26) | (29 << 21) | (29 << 16);
174 uint32_t i1
= virtPort
.read
<uint32_t>(addr
);
175 uint32_t i2
= virtPort
.read
<uint32_t>(addr
+ sizeof(AlphaISA::MachInst
));
177 if ((i1
& inst_mask
) == gp_ldah_pattern
&&
178 (i2
& inst_mask
) == gp_lda_pattern
) {
179 Addr new_addr
= addr
+ 2* sizeof(AlphaISA::MachInst
);
180 DPRINTF(Loader
, "fixFuncEventAddr: %p -> %p", addr
, new_addr
);
189 AlphaSystem::setAlphaAccess(Addr access
)
192 if (consoleSymtab
->findAddress("m5AlphaAccess", addr
)) {
193 virtPort
.write(addr
, htog(EV5::Phys2K0Seg(access
)));
195 panic("could not find m5AlphaAccess\n");
199 AlphaSystem::serialize(std::ostream
&os
)
201 System::serialize(os
);
202 consoleSymtab
->serialize("console_symtab", os
);
203 palSymtab
->serialize("pal_symtab", os
);
208 AlphaSystem::unserialize(Checkpoint
*cp
, const std::string
§ion
)
210 System::unserialize(cp
,section
);
211 consoleSymtab
->unserialize("console_symtab", cp
, section
);
212 palSymtab
->unserialize("pal_symtab", cp
, section
);
216 AlphaSystemParams::create()
218 return new AlphaSystem(this);