1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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: Ali Saidi
29 * Nathan Binkert
30 */
31
32#include <sys/signal.h>
33
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 "debug/Loader.hh"
41#include "mem/physical.hh"
42#include "mem/vport.hh"
43#include "params/AlphaSystem.hh"
44#include "sim/byteswap.hh"
45
46using namespace AlphaISA;
47
48AlphaSystem::AlphaSystem(Params *p)
49 : System(p), intrFreq(0)
50{
51 consoleSymtab = new SymbolTable;
52 palSymtab = new SymbolTable;
53
54
55 /**
56 * Load the pal, and console code into memory
57 */
58 // Load Console Code
59 console = createObjectFile(params()->console);
60 if (console == NULL)
61 fatal("Could not load console file %s", params()->console);
62
63 // Load pal file
64 pal = createObjectFile(params()->pal);
65 if (pal == NULL)
66 fatal("Could not load PALcode file %s", params()->pal);
67
68
69 // Load program sections into memory
70 pal->loadSections(functionalPort, loadAddrMask);
71 console->loadSections(functionalPort, loadAddrMask);
72
73 // load symbols
74 if (!console->loadGlobalSymbols(consoleSymtab))
75 panic("could not load console symbols\n");
76
77 if (!pal->loadGlobalSymbols(palSymtab))
78 panic("could not load pal symbols\n");
79
80 if (!pal->loadLocalSymbols(palSymtab))
81 panic("could not load pal symbols\n");
82
83 if (!console->loadGlobalSymbols(debugSymbolTable))
84 panic("could not load console symbols\n");
85
86 if (!pal->loadGlobalSymbols(debugSymbolTable))
87 panic("could not load pal symbols\n");
88
89 if (!pal->loadLocalSymbols(debugSymbolTable))
90 panic("could not load pal symbols\n");
91
92 Addr addr = 0;
93#ifndef NDEBUG
94 consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic");
95#endif
96
97 /**
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
101 * others do.)
102 */
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()));
106 }
107
108 /**
109 * Set the hardware reset parameter block system type and revision
110 * information to Tsunami.
111 */
112 if (consoleSymtab->findAddress("m5_rpb", addr)) {
113 uint64_t data;
114 data = htog(params()->system_type);
115 virtPort->write(addr+0x50, data);
116 data = htog(params()->system_rev);
117 virtPort->write(addr+0x58, data);
118 } else
119 panic("could not find hwrpb\n");
120}
121
122AlphaSystem::~AlphaSystem()
123{
124 delete consoleSymtab;
125 delete console;
126 delete pal;
127#ifdef DEBUG
128 delete consolePanicEvent;
129#endif
130}
131
132/**
133 * This function fixes up addresses that are used to match PCs for
134 * hooking simulator events on to target function executions.
135 *
136 * Alpha binaries may have multiple global offset table (GOT)
137 * sections. A function that uses the GOT starts with a
138 * two-instruction prolog which sets the global pointer (gp == r29) to
139 * the appropriate GOT section. The proper gp value is calculated
140 * based on the function address, which must be passed by the caller
141 * in the procedure value register (pv aka t12 == r27). This sequence
142 * looks like the following:
143 *
144 * opcode Ra Rb offset
145 * ldah gp,X(pv) 09 29 27 X
146 * lda gp,Y(gp) 08 29 29 Y
147 *
148 * for some constant offsets X and Y. The catch is that the linker
149 * (or maybe even the compiler, I'm not sure) may recognize that the
150 * caller and callee are using the same GOT section, making this
151 * prolog redundant, and modify the call target to skip these
152 * instructions. If we check for execution of the first instruction
153 * of a function (the one the symbol points to) to detect when to skip
154 * it, we'll miss all these modified calls. It might work to
155 * unconditionally check for the third instruction, but not all
156 * functions have this prolog, and there's some chance that those
157 * first two instructions could have undesired consequences. So we do
158 * the Right Thing and pattern-match the first two instructions of the
159 * function to decide where to patch.
160 *
161 * Eventually this code should be moved into an ISA-specific file.
162 */
163Addr
164AlphaSystem::fixFuncEventAddr(Addr addr)
165{
166 // mask for just the opcode, Ra, and Rb fields (not the offset)
167 const uint32_t inst_mask = 0xffff0000;
168 // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
169 const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16);
170 // lda gp,Y(gp): opcode 8, Ra = 29, rb = 29
171 const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16);
172
173 uint32_t i1 = virtPort->read<uint32_t>(addr);
174 uint32_t i2 = virtPort->read<uint32_t>(addr + sizeof(MachInst));
175
176 if ((i1 & inst_mask) == gp_ldah_pattern &&
177 (i2 & inst_mask) == gp_lda_pattern) {
178 Addr new_addr = addr + 2 * sizeof(MachInst);
179 DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr);
180 return new_addr;
181 } else {
182 return addr;
183 }
184}
185
186void
187AlphaSystem::setAlphaAccess(Addr access)
188{
189 Addr addr = 0;
190 if (consoleSymtab->findAddress("m5AlphaAccess", addr)) {
191 virtPort->write(addr, htog(Phys2K0Seg(access)));
192 } else {
193 panic("could not find m5AlphaAccess\n");
194 }
195}
196
197void
198AlphaSystem::serialize(std::ostream &os)
199{
200 System::serialize(os);
201 consoleSymtab->serialize("console_symtab", os);
202 palSymtab->serialize("pal_symtab", os);
203}
204
205void
206AlphaSystem::unserialize(Checkpoint *cp, const std::string &section)
207{
208 System::unserialize(cp,section);
209 consoleSymtab->unserialize("console_symtab", cp, section);
210 palSymtab->unserialize("pal_symtab", cp, section);
211}
212
213AlphaSystem *
214AlphaSystemParams::create()
215{
216 return new AlphaSystem(this);
217}