Bug Summary

File:hw/moxie/moxiesim.c
Location:line 66, column 5
Description:Value stored to 'initrd_offset' is never read

Annotated Source Code

1/*
2 * QEMU/moxiesim emulation
3 *
4 * Emulates a very simple machine model similar to the one used by the
5 * GDB moxie simulator.
6 *
7 * Copyright (c) 2008, 2009, 2010, 2013 Anthony Green
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/sysbus.h"
28#include "hw/hw.h"
29#include "hw/i386/pc.h"
30#include "hw/isa/isa.h"
31#include "net/net.h"
32#include "sysemu/sysemu.h"
33#include "hw/boards.h"
34#include "hw/loader.h"
35#include "hw/char/serial.h"
36#include "exec/address-spaces.h"
37
38#define PHYS_MEM_BASE0x80000000 0x80000000
39
40typedef struct {
41 uint64_t ram_size;
42 const char *kernel_filename;
43 const char *kernel_cmdline;
44 const char *initrd_filename;
45} LoaderParams;
46
47static void load_kernel(MoxieCPU *cpu, LoaderParams *loader_params)
48{
49 uint64_t entry, kernel_low, kernel_high;
50 long kernel_size;
51 long initrd_size;
52 ram_addr_t initrd_offset;
53
54 kernel_size = load_elf(loader_params->kernel_filename, NULL((void*)0), NULL((void*)0),
55 &entry, &kernel_low, &kernel_high, 1,
56 ELF_MACHINE0xFEED, 0);
57
58 if (!kernel_size) {
59 fprintf(stderrstderr, "qemu: could not load kernel '%s'\n",
60 loader_params->kernel_filename);
61 exit(1);
62 }
63
64 /* load initrd */
65 initrd_size = 0;
66 initrd_offset = 0;
Value stored to 'initrd_offset' is never read
67 if (loader_params->initrd_filename) {
68 initrd_size = get_image_size(loader_params->initrd_filename);
69 if (initrd_size > 0) {
70 initrd_offset = (kernel_high + ~TARGET_PAGE_MASK~((1 << 12) - 1))
71 & TARGET_PAGE_MASK~((1 << 12) - 1);
72 if (initrd_offset + initrd_size > loader_params->ram_size) {
73 fprintf(stderrstderr,
74 "qemu: memory too small for initial ram disk '%s'\n",
75 loader_params->initrd_filename);
76 exit(1);
77 }
78 initrd_size = load_image_targphys(loader_params->initrd_filename,
79 initrd_offset,
80 ram_size);
81 }
82 if (initrd_size == (target_ulong)-1) {
83 fprintf(stderrstderr, "qemu: could not load initial ram disk '%s'\n",
84 loader_params->initrd_filename);
85 exit(1);
86 }
87 }
88}
89
90static void main_cpu_reset(void *opaque)
91{
92 MoxieCPU *cpu = opaque;
93
94 cpu_reset(CPU(cpu)((CPUState *)object_dynamic_cast_assert(((Object *)((cpu))), (
"cpu"), "/home/stefan/src/qemu/qemu.org/qemu/hw/moxie/moxiesim.c"
, 94, __func__)));
95}
96
97static inline DeviceState *
98moxie_intc_create(hwaddr base, qemu_irq irq, int kind_of_intr)
99{
100 DeviceState *dev;
101
102 dev = qdev_create(NULL((void*)0), "moxie,intc");
103 qdev_prop_set_uint32(dev, "kind-of-intr", kind_of_intr);
104 qdev_init_nofail(dev);
105 sysbus_mmio_map(SYS_BUS_DEVICE(dev)((SysBusDevice *)object_dynamic_cast_assert(((Object *)((dev)
)), ("sys-bus-device"), "/home/stefan/src/qemu/qemu.org/qemu/hw/moxie/moxiesim.c"
, 105, __func__)), 0, base);
106 sysbus_connect_irq(SYS_BUS_DEVICE(dev)((SysBusDevice *)object_dynamic_cast_assert(((Object *)((dev)
)), ("sys-bus-device"), "/home/stefan/src/qemu/qemu.org/qemu/hw/moxie/moxiesim.c"
, 106, __func__)), 0, irq);
107 return dev;
108}
109
110static void moxiesim_init(QEMUMachineInitArgs *args)
111{
112 MoxieCPU *cpu = NULL((void*)0);
113 ram_addr_t ram_size = args->ram_size;
114 const char *cpu_model = args->cpu_model;
115 const char *kernel_filename = args->kernel_filename;
116 const char *kernel_cmdline = args->kernel_cmdline;
117 const char *initrd_filename = args->initrd_filename;
118 CPUMoxieState *env;
119 MemoryRegion *address_space_mem = get_system_memory();
120 MemoryRegion *ram = g_new(MemoryRegion, 1)((MemoryRegion *) g_malloc_n ((1), sizeof (MemoryRegion)));
121 MemoryRegion *rom = g_new(MemoryRegion, 1)((MemoryRegion *) g_malloc_n ((1), sizeof (MemoryRegion)));
122 hwaddr ram_base = 0x200000;
123 LoaderParams loader_params;
124
125 /* Init CPUs. */
126 if (cpu_model == NULL((void*)0)) {
127 cpu_model = "MoxieLite-moxie-cpu";
128 }
129 cpu = cpu_moxie_init(cpu_model);
130 if (!cpu) {
131 fprintf(stderrstderr, "Unable to find CPU definition\n");
132 exit(1);
133 }
134 env = &cpu->env;
135
136 qemu_register_reset(main_cpu_reset, cpu);
137
138 /* Allocate RAM. */
139 memory_region_init_ram(ram, NULL((void*)0), "moxiesim.ram", ram_size);
140 vmstate_register_ram_global(ram);
141 memory_region_add_subregion(address_space_mem, ram_base, ram);
142
143 memory_region_init_ram(rom, NULL((void*)0), "moxie.rom", 128*0x1000);
144 vmstate_register_ram_global(rom);
145 memory_region_add_subregion(get_system_memory(), 0x1000, rom);
146
147 if (kernel_filename) {
148 loader_params.ram_size = ram_size;
149 loader_params.kernel_filename = kernel_filename;
150 loader_params.kernel_cmdline = kernel_cmdline;
151 loader_params.initrd_filename = initrd_filename;
152 load_kernel(cpu, &loader_params);
153 }
154
155 /* A single 16450 sits at offset 0x3f8. */
156 if (serial_hds[0]) {
157 serial_mm_init(address_space_mem, 0x3f8, 0, env->irq[4],
158 8000000/16, serial_hds[0], DEVICE_LITTLE_ENDIAN);
159 }
160}
161
162static QEMUMachine moxiesim_machine = {
163 .name = "moxiesim",
164 .desc = "Moxie simulator platform",
165 .init = moxiesim_init,
166 .is_default = 1,
167};
168
169static void moxie_machine_init(void)
170{
171 qemu_register_machine(&moxiesim_machine);
172}
173
174machine_init(moxie_machine_init)static void __attribute__((constructor)) do_qemu_init_moxie_machine_init
(void) { register_module_init(moxie_machine_init, MODULE_INIT_MACHINE
); }