aboutsummaryrefslogtreecommitdiff
path: root/target-lm32/lm32-semi.c
blob: 20f1a1cd482293d0e83749ea9b52b5eb97a9be20 (plain)
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
/*
 *  Lattice Mico32 semihosting syscall interface
 *
 *  Copyright (c) 2014 Michael Walle <michael@walle.cc>
 *
 * Based on target-m68k/m68k-semi.c, which is
 *  Copyright (c) 2005-2007 CodeSourcery.
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "qemu/log.h"
#include "exec/softmmu-semi.h"

enum {
    TARGET_SYS_exit    = 1,
    TARGET_SYS_open    = 2,
    TARGET_SYS_close   = 3,
    TARGET_SYS_read    = 4,
    TARGET_SYS_write   = 5,
    TARGET_SYS_lseek   = 6,
    TARGET_SYS_fstat   = 10,
    TARGET_SYS_stat    = 15,
};

enum {
    NEWLIB_O_RDONLY    =   0x0,
    NEWLIB_O_WRONLY    =   0x1,
    NEWLIB_O_RDWR      =   0x2,
    NEWLIB_O_APPEND    =   0x8,
    NEWLIB_O_CREAT     = 0x200,
    NEWLIB_O_TRUNC     = 0x400,
    NEWLIB_O_EXCL      = 0x800,
};

static int translate_openflags(int flags)
{
    int hf;

    if (flags & NEWLIB_O_WRONLY) {
        hf = O_WRONLY;
    } else if (flags & NEWLIB_O_RDWR) {
        hf = O_RDWR;
    } else {
        hf = O_RDONLY;
    }

    if (flags & NEWLIB_O_APPEND) {
        hf |= O_APPEND;
    }

    if (flags & NEWLIB_O_CREAT) {
        hf |= O_CREAT;
    }

    if (flags & NEWLIB_O_TRUNC) {
        hf |= O_TRUNC;
    }

    if (flags & NEWLIB_O_EXCL) {
        hf |= O_EXCL;
    }

    return hf;
}

struct newlib_stat {
    int16_t     newlib_st_dev;     /* device */
    uint16_t    newlib_st_ino;     /* inode */
    uint16_t    newlib_st_mode;    /* protection */
    uint16_t    newlib_st_nlink;   /* number of hard links */
    uint16_t    newlib_st_uid;     /* user ID of owner */
    uint16_t    newlib_st_gid;     /* group ID of owner */
    int16_t     newlib_st_rdev;    /* device type (if inode device) */
    int32_t     newlib_st_size;    /* total size, in bytes */
    int32_t     newlib_st_atime;   /* time of last access */
    uint32_t    newlib_st_spare1;
    int32_t     newlib_st_mtime;   /* time of last modification */
    uint32_t    newlib_st_spare2;
    int32_t     newlib_st_ctime;   /* time of last change */
    uint32_t    newlib_st_spare3;
} QEMU_PACKED;

static int translate_stat(CPULM32State *env, target_ulong addr,
        struct stat *s)
{
    struct newlib_stat *p;

    p = lock_user(VERIFY_WRITE, addr, sizeof(struct newlib_stat), 0);
    if (!p) {
        return 0;
    }
    p->newlib_st_dev = cpu_to_be16(s->st_dev);
    p->newlib_st_ino = cpu_to_be16(s->st_ino);
    p->newlib_st_mode = cpu_to_be16(s->st_mode);
    p->newlib_st_nlink = cpu_to_be16(s->st_nlink);
    p->newlib_st_uid = cpu_to_be16(s->st_uid);
    p->newlib_st_gid = cpu_to_be16(s->st_gid);
    p->newlib_st_rdev = cpu_to_be16(s->st_rdev);
    p->newlib_st_size = cpu_to_be32(s->st_size);
    p->newlib_st_atime = cpu_to_be32(s->st_atime);
    p->newlib_st_mtime = cpu_to_be32(s->st_mtime);
    p->newlib_st_ctime = cpu_to_be32(s->st_ctime);
    unlock_user(p, addr, sizeof(struct newlib_stat));

    return 1;
}

bool lm32_cpu_do_semihosting(CPUState *cs)
{
    LM32CPU *cpu = LM32_CPU(cs);
    CPULM32State *env = &cpu->env;

    int ret = -1;
    target_ulong nr, arg0, arg1, arg2;
    void *p;
    struct stat s;

    nr = env->regs[R_R8];
    arg0 = env->regs[R_R1];
    arg1 = env->regs[R_R2];
    arg2 = env->regs[R_R3];

    switch (nr) {
    case TARGET_SYS_exit:
        /* void _exit(int rc) */
        exit(arg0);

    case TARGET_SYS_open:
        /* int open(const char *pathname, int flags) */
        p = lock_user_string(arg0);
        if (!p) {
            ret = -1;
        } else {
            ret = open(p, translate_openflags(arg2));
            unlock_user(p, arg0, 0);
        }
        break;

    case TARGET_SYS_read:
        /* ssize_t read(int fd, const void *buf, size_t count) */
        p = lock_user(VERIFY_WRITE, arg1, arg2, 0);
        if (!p) {
            ret = -1;
        } else {
            ret = read(arg0, p, arg2);
            unlock_user(p, arg1, arg2);
        }
        break;

    case TARGET_SYS_write:
        /* ssize_t write(int fd, const void *buf, size_t count) */
        p = lock_user(VERIFY_READ, arg1, arg2, 1);
        if (!p) {
            ret = -1;
        } else {
            ret = write(arg0, p, arg2);
            unlock_user(p, arg1, 0);
        }
        break;

    case TARGET_SYS_close:
        /* int close(int fd) */
        /* don't close stdin/stdout/stderr */
        if (arg0 > 2) {
            ret = close(arg0);
        } else {
            ret = 0;
        }
        break;

    case TARGET_SYS_lseek:
        /* off_t lseek(int fd, off_t offset, int whence */
        ret = lseek(arg0, arg1, arg2);
        break;

    case TARGET_SYS_stat:
        /* int stat(const char *path, struct stat *buf) */
        p = lock_user_string(arg0);
        if (!p) {
            ret = -1;
        } else {
            ret = stat(p, &s);
            unlock_user(p, arg0, 0);
            if (translate_stat(env, arg1, &s) == 0) {
                ret = -1;
            }
        }
        break;

    case TARGET_SYS_fstat:
        /* int stat(int fd, struct stat *buf) */
        ret = fstat(arg0, &s);
        if (ret == 0) {
            if (translate_stat(env, arg1, &s) == 0) {
                ret = -1;
            }
        }
        break;

    default:
        /* unhandled */
        return false;
    }

    env->regs[R_R1] = ret;
    return true;
}