2 * m68k/ColdFire Semihosting syscall interface
4 * Copyright (c) 2005-2007 CodeSourcery.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 #include "qemu/osdep.h"
23 #include "exec/gdbstub.h"
24 #if defined(CONFIG_USER_ONLY)
26 #define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
28 #include "exec/softmmu-semi.h"
29 #include "hw/boards.h"
34 #define HOSTED_INIT_SIM 1
36 #define HOSTED_CLOSE 3
38 #define HOSTED_WRITE 5
39 #define HOSTED_LSEEK 6
40 #define HOSTED_RENAME 7
41 #define HOSTED_UNLINK 8
43 #define HOSTED_FSTAT 10
44 #define HOSTED_GETTIMEOFDAY 11
45 #define HOSTED_ISATTY 12
46 #define HOSTED_SYSTEM 13
48 typedef uint32_t gdb_mode_t;
49 typedef uint32_t gdb_time_t;
51 struct m68k_gdb_stat {
52 uint32_t gdb_st_dev; /* device */
53 uint32_t gdb_st_ino; /* inode */
54 gdb_mode_t gdb_st_mode; /* protection */
55 uint32_t gdb_st_nlink; /* number of hard links */
56 uint32_t gdb_st_uid; /* user ID of owner */
57 uint32_t gdb_st_gid; /* group ID of owner */
58 uint32_t gdb_st_rdev; /* device type (if inode device) */
59 uint64_t gdb_st_size; /* total size, in bytes */
60 uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
61 uint64_t gdb_st_blocks; /* number of blocks allocated */
62 gdb_time_t gdb_st_atime; /* time of last access */
63 gdb_time_t gdb_st_mtime; /* time of last modification */
64 gdb_time_t gdb_st_ctime; /* time of last change */
68 gdb_time_t tv_sec; /* second */
69 uint64_t tv_usec; /* microsecond */
72 #define GDB_O_RDONLY 0x0
73 #define GDB_O_WRONLY 0x1
74 #define GDB_O_RDWR 0x2
75 #define GDB_O_APPEND 0x8
76 #define GDB_O_CREAT 0x200
77 #define GDB_O_TRUNC 0x400
78 #define GDB_O_EXCL 0x800
80 static int translate_openflags(int flags)
84 if (flags & GDB_O_WRONLY)
86 else if (flags & GDB_O_RDWR)
91 if (flags & GDB_O_APPEND) hf |= O_APPEND;
92 if (flags & GDB_O_CREAT) hf |= O_CREAT;
93 if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
94 if (flags & GDB_O_EXCL) hf |= O_EXCL;
99 static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
101 struct m68k_gdb_stat *p;
103 if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
104 /* FIXME - should this return an error code? */
106 p->gdb_st_dev = cpu_to_be32(s->st_dev);
107 p->gdb_st_ino = cpu_to_be32(s->st_ino);
108 p->gdb_st_mode = cpu_to_be32(s->st_mode);
109 p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
110 p->gdb_st_uid = cpu_to_be32(s->st_uid);
111 p->gdb_st_gid = cpu_to_be32(s->st_gid);
112 p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
113 p->gdb_st_size = cpu_to_be64(s->st_size);
115 /* Windows stat is missing some fields. */
116 p->gdb_st_blksize = 0;
117 p->gdb_st_blocks = 0;
119 p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
120 p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
122 p->gdb_st_atime = cpu_to_be32(s->st_atime);
123 p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
124 p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
125 unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
128 static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
130 target_ulong args = env->dregs[1];
131 if (put_user_u32(ret, args) ||
132 put_user_u32(err, args + 4)) {
134 * The m68k semihosting ABI does not provide any way to report this
135 * error to the guest, so the best we can do is log it in qemu.
136 * It is always a guest error not to pass us a valid argument block.
138 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
139 "discarded because argument block not writable\n");
143 static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
145 target_ulong args = env->dregs[1];
146 if (put_user_u32(ret >> 32, args) ||
147 put_user_u32(ret, args + 4) ||
148 put_user_u32(err, args + 8)) {
149 /* No way to report this via m68k semihosting ABI; just log it */
150 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
151 "discarded because argument block not writable\n");
155 static int m68k_semi_is_fseek;
157 static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
159 M68kCPU *cpu = M68K_CPU(cs);
160 CPUM68KState *env = &cpu->env;
162 if (m68k_semi_is_fseek) {
164 * FIXME: We've already lost the high bits of the fseek
167 m68k_semi_return_u64(env, ret, err);
168 m68k_semi_is_fseek = 0;
170 m68k_semi_return_u32(env, ret, err);
175 * Read the input value from the argument block; fail the semihosting
176 * call if the memory read fails.
178 #define GET_ARG(n) do { \
179 if (get_user_ual(arg ## n, args + (n) * 4)) { \
186 void do_m68k_semihosting(CPUM68KState *env, int nr)
189 target_ulong arg0, arg1, arg2, arg3;
195 args = env->dregs[1];
198 gdb_exit(env->dregs[0]);
205 if (use_gdb_syscalls()) {
206 gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
210 p = lock_user_string(arg0);
212 /* FIXME - check error code? */
215 result = open(p, translate_openflags(arg2), arg3);
216 unlock_user(p, arg0, 0);
222 /* Ignore attempts to close stdin/out/err. */
226 if (use_gdb_syscalls()) {
227 gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
242 if (use_gdb_syscalls()) {
243 gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
247 p = lock_user(VERIFY_WRITE, arg1, len, 0);
249 /* FIXME - check error code? */
252 result = read(arg0, p, len);
253 unlock_user(p, arg1, len);
262 if (use_gdb_syscalls()) {
263 gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
267 p = lock_user(VERIFY_READ, arg1, len, 1);
269 /* FIXME - check error code? */
272 result = write(arg0, p, len);
273 unlock_user(p, arg0, 0);
284 off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
285 if (use_gdb_syscalls()) {
286 m68k_semi_is_fseek = 1;
287 gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
290 off = lseek(arg0, off, arg3);
291 m68k_semi_return_u64(env, off, errno);
300 if (use_gdb_syscalls()) {
301 gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
302 arg0, (int)arg1, arg2, (int)arg3);
305 p = lock_user_string(arg0);
306 q = lock_user_string(arg2);
308 /* FIXME - check error code? */
311 result = rename(p, q);
313 unlock_user(p, arg0, 0);
314 unlock_user(q, arg2, 0);
320 if (use_gdb_syscalls()) {
321 gdb_do_syscall(m68k_semi_cb, "unlink,%s",
325 p = lock_user_string(arg0);
327 /* FIXME - check error code? */
331 unlock_user(p, arg0, 0);
339 if (use_gdb_syscalls()) {
340 gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
341 arg0, (int)arg1, arg2);
345 p = lock_user_string(arg0);
347 /* FIXME - check error code? */
350 result = stat(p, &s);
351 unlock_user(p, arg0, 0);
354 translate_stat(env, arg2, &s);
361 if (use_gdb_syscalls()) {
362 gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
367 result = fstat(arg0, &s);
369 translate_stat(env, arg1, &s);
373 case HOSTED_GETTIMEOFDAY:
376 if (use_gdb_syscalls()) {
377 gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
382 struct gdb_timeval *p;
383 result = qemu_gettimeofday(&tv);
385 if (!(p = lock_user(VERIFY_WRITE,
386 arg0, sizeof(struct gdb_timeval), 0))) {
387 /* FIXME - check error code? */
390 p->tv_sec = cpu_to_be32(tv.tv_sec);
391 p->tv_usec = cpu_to_be64(tv.tv_usec);
392 unlock_user(p, arg0, sizeof(struct gdb_timeval));
399 if (use_gdb_syscalls()) {
400 gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
403 result = isatty(arg0);
409 if (use_gdb_syscalls()) {
410 gdb_do_syscall(m68k_semi_cb, "system,%s",
414 p = lock_user_string(arg0);
416 /* FIXME - check error code? */
420 unlock_user(p, arg0, 0);
424 case HOSTED_INIT_SIM:
425 #if defined(CONFIG_USER_ONLY)
427 CPUState *cs = env_cpu(env);
428 TaskState *ts = cs->opaque;
429 /* Allocate the heap using sbrk. */
430 if (!ts->heap_limit) {
436 size = SEMIHOSTING_HEAP_SIZE;
437 /* Try a big heap, and reduce the size if that fails. */
439 ret = do_brk(base + size);
440 if (ret >= (base + size)) {
445 ts->heap_limit = base + size;
448 * This call may happen before we have writable memory, so return
449 * values directly in registers.
451 env->dregs[1] = ts->heap_limit;
452 env->aregs[7] = ts->stack_base;
456 * FIXME: This is wrong for boards where RAM does not start at
459 env->dregs[1] = current_machine->ram_size;
460 env->aregs[7] = current_machine->ram_size;
464 cpu_abort(env_cpu(env), "Unsupported semihosting syscall %d\n", nr);
468 m68k_semi_return_u32(env, result, errno);