1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Open Source and Linux Lab nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stddef.h>
#include "cpu.h"
#include "dyngen-exec.h"
#include "helper.h"
#include "qemu-log.h"
enum {
TARGET_SYS_exit = 1,
TARGET_SYS_read = 3,
TARGET_SYS_write = 4,
TARGET_SYS_open = 5,
TARGET_SYS_close = 6,
TARGET_SYS_lseek = 19,
TARGET_SYS_select_one = 29,
TARGET_SYS_argc = 1000,
TARGET_SYS_argv_sz = 1001,
TARGET_SYS_argv = 1002,
TARGET_SYS_memset = 1004,
};
enum {
SELECT_ONE_READ = 1,
SELECT_ONE_WRITE = 2,
SELECT_ONE_EXCEPT = 3,
};
void HELPER(simcall)(CPUXtensaState *env)
{
uint32_t *regs = env->regs;
switch (regs[2]) {
case TARGET_SYS_exit:
qemu_log("exit(%d) simcall\n", regs[3]);
exit(regs[3]);
break;
case TARGET_SYS_read:
case TARGET_SYS_write:
{
bool is_write = regs[2] == TARGET_SYS_write;
uint32_t fd = regs[3];
uint32_t vaddr = regs[4];
uint32_t len = regs[5];
while (len > 0) {
target_phys_addr_t paddr =
cpu_get_phys_page_debug(env, vaddr);
uint32_t page_left =
TARGET_PAGE_SIZE - (vaddr & (TARGET_PAGE_SIZE - 1));
uint32_t io_sz = page_left < len ? page_left : len;
target_phys_addr_t sz = io_sz;
void *buf = cpu_physical_memory_map(paddr, &sz, is_write);
if (buf) {
vaddr += io_sz;
len -= io_sz;
regs[2] = is_write ?
write(fd, buf, io_sz) :
read(fd, buf, io_sz);
regs[3] = errno;
cpu_physical_memory_unmap(buf, sz, is_write, sz);
if (regs[2] == -1) {
break;
}
} else {
regs[2] = -1;
regs[3] = EINVAL;
break;
}
}
}
break;
case TARGET_SYS_open:
{
char name[1024];
int rc;
int i;
for (i = 0; i < ARRAY_SIZE(name); ++i) {
rc = cpu_memory_rw_debug(
env, regs[3] + i, (uint8_t *)name + i, 1, 0);
if (rc != 0 || name[i] == 0) {
break;
}
}
if (rc == 0 && i < ARRAY_SIZE(name)) {
regs[2] = open(name, regs[4], regs[5]);
regs[3] = errno;
} else {
regs[2] = -1;
regs[3] = EINVAL;
}
}
break;
case TARGET_SYS_close:
if (regs[3] < 3) {
regs[2] = regs[3] = 0;
} else {
regs[2] = close(regs[3]);
regs[3] = errno;
}
break;
case TARGET_SYS_lseek:
regs[2] = lseek(regs[3], (off_t)(int32_t)regs[4], regs[5]);
regs[3] = errno;
break;
case TARGET_SYS_select_one:
{
uint32_t fd = regs[3];
uint32_t rq = regs[4];
uint32_t target_tv = regs[5];
uint32_t target_tvv[2];
struct timeval tv = {0};
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
if (target_tv) {
cpu_memory_rw_debug(env, target_tv,
(uint8_t *)target_tvv, sizeof(target_tvv), 0);
tv.tv_sec = (int32_t)tswap32(target_tvv[0]);
tv.tv_usec = (int32_t)tswap32(target_tvv[1]);
}
regs[2] = select(fd + 1,
rq == SELECT_ONE_READ ? &fdset : NULL,
rq == SELECT_ONE_WRITE ? &fdset : NULL,
rq == SELECT_ONE_EXCEPT ? &fdset : NULL,
target_tv ? &tv : NULL);
regs[3] = errno;
}
break;
case TARGET_SYS_argc:
regs[2] = 1;
regs[3] = 0;
break;
case TARGET_SYS_argv_sz:
regs[2] = 128;
regs[3] = 0;
break;
case TARGET_SYS_argv:
{
struct Argv {
uint32_t argptr[2];
char text[120];
} argv = {
{0, 0},
"test"
};
argv.argptr[0] = tswap32(regs[3] + offsetof(struct Argv, text));
cpu_memory_rw_debug(
env, regs[3], (uint8_t *)&argv, sizeof(argv), 1);
}
break;
case TARGET_SYS_memset:
{
uint32_t base = regs[3];
uint32_t sz = regs[5];
while (sz) {
target_phys_addr_t len = sz;
void *buf = cpu_physical_memory_map(base, &len, 1);
if (buf && len) {
memset(buf, regs[4], len);
cpu_physical_memory_unmap(buf, len, 1, len);
} else {
len = 1;
}
base += len;
sz -= len;
}
regs[2] = regs[3];
regs[3] = 0;
}
break;
default:
qemu_log("%s(%d): not implemented\n", __func__, regs[2]);
regs[2] = -1;
regs[3] = ENOSYS;
break;
}
}
|
