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/vtophys.hh"
37 #include "base/loader/object_file.hh"
38 #include "base/loader/symtab.hh"
39 #include "base/trace.hh"
40 #include "mem/physical.hh"
41 #include "params/AlphaSystem.hh"
42 #include "sim/byteswap.hh"
44 using namespace AlphaISA
;
46 AlphaSystem::AlphaSystem(Params
*p
)
49 consoleSymtab
= new SymbolTable
;
50 palSymtab
= new SymbolTable
;
54 * Load the pal, and console code into memory
57 console
= createObjectFile(params()->console
);
59 fatal("Could not load console file %s", params()->console
);
62 pal
= createObjectFile(params()->pal
);
64 fatal("Could not load PALcode file %s", params()->pal
);
67 // Load program sections into memory
68 pal
->loadSections(&functionalPort
, LoadAddrMask
);
69 console
->loadSections(&functionalPort
, LoadAddrMask
);
72 if (!console
->loadGlobalSymbols(consoleSymtab
))
73 panic("could not load console symbols\n");
75 if (!pal
->loadGlobalSymbols(palSymtab
))
76 panic("could not load pal symbols\n");
78 if (!pal
->loadLocalSymbols(palSymtab
))
79 panic("could not load pal symbols\n");
81 if (!console
->loadGlobalSymbols(debugSymbolTable
))
82 panic("could not load console symbols\n");
84 if (!pal
->loadGlobalSymbols(debugSymbolTable
))
85 panic("could not load pal symbols\n");
87 if (!pal
->loadLocalSymbols(debugSymbolTable
))
88 panic("could not load pal symbols\n");
92 consolePanicEvent
= addConsoleFuncEvent
<BreakPCEvent
>("panic");
96 * Copy the osflags (kernel arguments) into the consoles
97 * memory. (Presently Linux does not use the console service
98 * routine to get these command line arguments, but Tru64 and
101 if (consoleSymtab
->findAddress("env_booted_osflags", addr
)) {
102 virtPort
.writeBlob(addr
, (uint8_t*)params()->boot_osflags
.c_str(),
103 strlen(params()->boot_osflags
.c_str()));
107 * Set the hardware reset parameter block system type and revision
108 * information to Tsunami.
110 if (consoleSymtab
->findAddress("m5_rpb", addr
)) {
112 data
= htog(params()->system_type
);
113 virtPort
.write(addr
+0x50, data
);
114 data
= htog(params()->system_rev
);
115 virtPort
.write(addr
+0x58, data
);
117 panic("could not find hwrpb\n");
120 AlphaSystem::~AlphaSystem()
122 delete consoleSymtab
;
126 delete consolePanicEvent
;
131 * This function fixes up addresses that are used to match PCs for
132 * hooking simulator events on to target function executions.
134 * Alpha binaries may have multiple global offset table (GOT)
135 * sections. A function that uses the GOT starts with a
136 * two-instruction prolog which sets the global pointer (gp == r29) to
137 * the appropriate GOT section. The proper gp value is calculated
138 * based on the function address, which must be passed by the caller
139 * in the procedure value register (pv aka t12 == r27). This sequence
140 * looks like the following:
142 * opcode Ra Rb offset
143 * ldah gp,X(pv) 09 29 27 X
144 * lda gp,Y(gp) 08 29 29 Y
146 * for some constant offsets X and Y. The catch is that the linker
147 * (or maybe even the compiler, I'm not sure) may recognize that the
148 * caller and callee are using the same GOT section, making this
149 * prolog redundant, and modify the call target to skip these
150 * instructions. If we check for execution of the first instruction
151 * of a function (the one the symbol points to) to detect when to skip
152 * it, we'll miss all these modified calls. It might work to
153 * unconditionally check for the third instruction, but not all
154 * functions have this prolog, and there's some chance that those
155 * first two instructions could have undesired consequences. So we do
156 * the Right Thing and pattern-match the first two instructions of the
157 * function to decide where to patch.
159 * Eventually this code should be moved into an ISA-specific file.
162 AlphaSystem::fixFuncEventAddr(Addr addr
)
164 // mask for just the opcode, Ra, and Rb fields (not the offset)
165 const uint32_t inst_mask
= 0xffff0000;
166 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
167 const uint32_t gp_ldah_pattern
= (9 << 26) | (29 << 21) | (27 << 16);
168 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29
169 const uint32_t gp_lda_pattern
= (8 << 26) | (29 << 21) | (29 << 16);
171 uint32_t i1
= virtPort
.read
<uint32_t>(addr
);
172 uint32_t i2
= virtPort
.read
<uint32_t>(addr
+ sizeof(MachInst
));
174 if ((i1
& inst_mask
) == gp_ldah_pattern
&&
175 (i2
& inst_mask
) == gp_lda_pattern
) {
176 Addr new_addr
= addr
+ 2 * sizeof(MachInst
);
177 DPRINTF(Loader
, "fixFuncEventAddr: %p -> %p", addr
, new_addr
);
185 AlphaSystem::setAlphaAccess(Addr access
)
188 if (consoleSymtab
->findAddress("m5AlphaAccess", addr
)) {
189 virtPort
.write(addr
, htog(Phys2K0Seg(access
)));
191 panic("could not find m5AlphaAccess\n");
196 AlphaSystem::serialize(std::ostream
&os
)
198 System::serialize(os
);
199 consoleSymtab
->serialize("console_symtab", os
);
200 palSymtab
->serialize("pal_symtab", os
);
204 AlphaSystem::unserialize(Checkpoint
*cp
, const std::string
§ion
)
206 System::unserialize(cp
,section
);
207 consoleSymtab
->unserialize("console_symtab", cp
, section
);
208 palSymtab
->unserialize("pal_symtab", cp
, section
);
212 AlphaSystemParams::create()
214 return new AlphaSystem(this);