Bug Summary

File:hw/mips/../mips_mipssim.c
Location:line 82, column 5
Description:Value stored to 'initrd_offset' is never read

Annotated Source Code

1/*
2 * QEMU/mipssim emulation
3 *
4 * Emulates a very simple machine model similar to the one used by the
5 * proprietary MIPS emulator.
6 *
7 * Copyright (c) 2007 Thiemo Seufer
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 * THE SOFTWARE.
26 */
27#include "hw.h"
28#include "mips.h"
29#include "mips_cpudevs.h"
30#include "pc.h"
31#include "isa.h"
32#include "net.h"
33#include "sysemu.h"
34#include "boards.h"
35#include "mips-bios.h"
36#include "loader.h"
37#include "elf.h"
38#include "sysbus.h"
39#include "exec-memory.h"
40
41static struct _loaderparams {
42 int ram_size;
43 const char *kernel_filename;
44 const char *kernel_cmdline;
45 const char *initrd_filename;
46} loaderparams;
47
48typedef struct ResetData {
49 MIPSCPU *cpu;
50 uint64_t vector;
51} ResetData;
52
53static int64_t load_kernel(void)
54{
55 int64_t entry, kernel_high;
56 long kernel_size;
57 long initrd_size;
58 ram_addr_t initrd_offset;
59 int big_endian;
60
61#ifdef TARGET_WORDS_BIGENDIAN1
62 big_endian = 1;
63#else
64 big_endian = 0;
65#endif
66
67 kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
68 NULL((void*)0), (uint64_t *)&entry, NULL((void*)0),
69 (uint64_t *)&kernel_high, big_endian,
70 ELF_MACHINE8, 1);
71 if (kernel_size >= 0) {
72 if ((entry & ~0x7fffffffULL) == 0x80000000)
73 entry = (int32_t)entry;
74 } else {
75 fprintf(stderrstderr, "qemu: could not load kernel '%s'\n",
76 loaderparams.kernel_filename);
77 exit(1);
78 }
79
80 /* load initrd */
81 initrd_size = 0;
82 initrd_offset = 0;
Value stored to 'initrd_offset' is never read
83 if (loaderparams.initrd_filename) {
84 initrd_size = get_image_size (loaderparams.initrd_filename);
85 if (initrd_size > 0) {
86 initrd_offset = (kernel_high + ~TARGET_PAGE_MASK~((1 << 12) - 1)) & TARGET_PAGE_MASK~((1 << 12) - 1);
87 if (initrd_offset + initrd_size > loaderparams.ram_size) {
88 fprintf(stderrstderr,
89 "qemu: memory too small for initial ram disk '%s'\n",
90 loaderparams.initrd_filename);
91 exit(1);
92 }
93 initrd_size = load_image_targphys(loaderparams.initrd_filename,
94 initrd_offset, loaderparams.ram_size - initrd_offset);
95 }
96 if (initrd_size == (target_ulong) -1) {
97 fprintf(stderrstderr, "qemu: could not load initial ram disk '%s'\n",
98 loaderparams.initrd_filename);
99 exit(1);
100 }
101 }
102 return entry;
103}
104
105static void main_cpu_reset(void *opaque)
106{
107 ResetData *s = (ResetData *)opaque;
108 CPUMIPSState *env = &s->cpu->env;
109
110 cpu_reset(CPU(s->cpu)((CPUState *)object_dynamic_cast_assert(((Object *)((s->cpu
))), ("cpu"))));
111 env->active_tc.PC = s->vector & ~(target_ulong)1;
112 if (s->vector & 1) {
113 env->hflags |= MIPS_HFLAG_M160x00400;
114 }
115}
116
117static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)
118{
119 DeviceState *dev;
120 SysBusDevice *s;
121
122 dev = qdev_create(NULL((void*)0), "mipsnet");
123 qdev_set_nic_properties(dev, nd);
124 qdev_init_nofail(dev);
125
126 s = sysbus_from_qdev(dev)((SysBusDevice *)(dev));
127 sysbus_connect_irq(s, 0, irq);
128 memory_region_add_subregion(get_system_io(),
129 base,
130 sysbus_mmio_get_region(s, 0));
131}
132
133static void
134mips_mipssim_init (ram_addr_t ram_size,
135 const char *boot_device,
136 const char *kernel_filename, const char *kernel_cmdline,
137 const char *initrd_filename, const char *cpu_model)
138{
139 char *filename;
140 MemoryRegion *address_space_mem = get_system_memory();
141 MemoryRegion *ram = g_new(MemoryRegion, 1)((MemoryRegion *) g_malloc_n ((1), sizeof (MemoryRegion)));
142 MemoryRegion *bios = g_new(MemoryRegion, 1)((MemoryRegion *) g_malloc_n ((1), sizeof (MemoryRegion)));
143 MIPSCPU *cpu;
144 CPUMIPSState *env;
145 ResetData *reset_info;
146 int bios_size;
147
148 /* Init CPUs. */
149 if (cpu_model == NULL((void*)0)) {
150#ifdef TARGET_MIPS641
151 cpu_model = "5Kf";
152#else
153 cpu_model = "24Kf";
154#endif
155 }
156 cpu = cpu_mips_init(cpu_model);
157 if (cpu == NULL((void*)0)) {
158 fprintf(stderrstderr, "Unable to find CPU definition\n");
159 exit(1);
160 }
161 env = &cpu->env;
162
163 reset_info = g_malloc0(sizeof(ResetData));
164 reset_info->cpu = cpu;
165 reset_info->vector = env->active_tc.PC;
166 qemu_register_reset(main_cpu_reset, reset_info);
167
168 /* Allocate RAM. */
169 memory_region_init_ram(ram, "mips_mipssim.ram", ram_size);
170 vmstate_register_ram_global(ram);
171 memory_region_init_ram(bios, "mips_mipssim.bios", BIOS_SIZE(4 * 1024 * 1024));
172 vmstate_register_ram_global(bios);
173 memory_region_set_readonly(bios, true1);
174
175 memory_region_add_subregion(address_space_mem, 0, ram);
176
177 /* Map the BIOS / boot exception handler. */
178 memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
179 /* Load a BIOS / boot exception handler image. */
180 if (bios_name == NULL((void*)0))
181 bios_name = BIOS_FILENAME"mips_bios.bin";
182 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS0, bios_name);
183 if (filename) {
184 bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE(4 * 1024 * 1024));
185 g_free(filename);
186 } else {
187 bios_size = -1;
188 }
189 if ((bios_size < 0 || bios_size > BIOS_SIZE(4 * 1024 * 1024)) && !kernel_filename) {
190 /* Bail out if we have neither a kernel image nor boot vector code. */
191 fprintf(stderrstderr,
192 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
193 filename);
194 exit(1);
195 } else {
196 /* We have a boot vector start address. */
197 env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
198 }
199
200 if (kernel_filename) {
201 loaderparams.ram_size = ram_size;
202 loaderparams.kernel_filename = kernel_filename;
203 loaderparams.kernel_cmdline = kernel_cmdline;
204 loaderparams.initrd_filename = initrd_filename;
205 reset_info->vector = load_kernel();
206 }
207
208 /* Init CPU internal devices. */
209 cpu_mips_irq_init_cpu(env);
210 cpu_mips_clock_init(env);
211
212 /* Register 64 KB of ISA IO space at 0x1fd00000. */
213 isa_mmio_init(0x1fd00000, 0x00010000);
214
215 /* A single 16450 sits at offset 0x3f8. It is attached to
216 MIPS CPU INT2, which is interrupt 4. */
217 if (serial_hds[0])
218 serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
219
220 if (nd_table[0].vlan)
221 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
222 mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
223}
224
225static QEMUMachine mips_mipssim_machine = {
226 .name = "mipssim",
227 .desc = "MIPS MIPSsim platform",
228 .init = mips_mipssim_init,
229};
230
231static void mips_mipssim_machine_init(void)
232{
233 qemu_register_machine(&mips_mipssim_machine);
234}
235
236machine_init(mips_mipssim_machine_init)static void __attribute__((constructor)) do_qemu_init_mips_mipssim_machine_init
(void) { register_module_init(mips_mipssim_machine_init, MODULE_INIT_MACHINE
); };