| 1 | /* syscalls.c --- implement system calls for the M32C simulator. |
| 2 | |
| 3 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| 4 | Contributed by Red Hat, Inc. |
| 5 | |
| 6 | This file is part of the GNU simulators. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "config.h" |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <unistd.h> |
| 26 | #include <sys/time.h> |
| 27 | |
| 28 | #include "gdb/callback.h" |
| 29 | |
| 30 | #include "cpu.h" |
| 31 | #include "mem.h" |
| 32 | #include "syscalls.h" |
| 33 | |
| 34 | #include "syscall.h" |
| 35 | |
| 36 | /* The current syscall callbacks we're using. */ |
| 37 | static struct host_callback_struct *callbacks; |
| 38 | |
| 39 | void |
| 40 | set_callbacks (struct host_callback_struct *cb) |
| 41 | { |
| 42 | callbacks = cb; |
| 43 | } |
| 44 | |
| 45 | |
| 46 | /* A16 ABI: arg1 in r1l (QI) or r1 (HI) or stack |
| 47 | arg2 in r2 (HI) or stack |
| 48 | arg3..N on stack |
| 49 | padding: none |
| 50 | |
| 51 | A24 ABI: arg1 in r0l (QI) or r0 (HI) or stack |
| 52 | arg2..N on stack |
| 53 | padding: qi->hi |
| 54 | |
| 55 | return value in r0l (QI) r0 (HI) r2r0 (SI) |
| 56 | structs: pointer pushed on stack last |
| 57 | |
| 58 | */ |
| 59 | |
| 60 | int argp, stackp; |
| 61 | |
| 62 | static int |
| 63 | arg (int bytes) |
| 64 | { |
| 65 | int rv = 0; |
| 66 | argp++; |
| 67 | if (A16) |
| 68 | { |
| 69 | switch (argp) |
| 70 | { |
| 71 | case 1: |
| 72 | if (bytes == 1) |
| 73 | return get_reg (r1l); |
| 74 | if (bytes == 2) |
| 75 | return get_reg (r1); |
| 76 | break; |
| 77 | case 2: |
| 78 | if (bytes == 2) |
| 79 | return get_reg (r2); |
| 80 | break; |
| 81 | } |
| 82 | } |
| 83 | else |
| 84 | { |
| 85 | switch (argp) |
| 86 | { |
| 87 | case 1: |
| 88 | if (bytes == 1) |
| 89 | return get_reg (r0l); |
| 90 | if (bytes == 2) |
| 91 | return get_reg (r0); |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | if (bytes == 0) |
| 96 | bytes = 2; |
| 97 | switch (bytes) |
| 98 | { |
| 99 | case 1: |
| 100 | rv = mem_get_qi (get_reg (sp) + stackp); |
| 101 | if (A24) |
| 102 | stackp++; |
| 103 | break; |
| 104 | case 2: |
| 105 | rv = mem_get_hi (get_reg (sp) + stackp); |
| 106 | break; |
| 107 | case 3: |
| 108 | rv = mem_get_psi (get_reg (sp) + stackp); |
| 109 | if (A24) |
| 110 | stackp++; |
| 111 | break; |
| 112 | case 4: |
| 113 | rv = mem_get_si (get_reg (sp) + stackp); |
| 114 | break; |
| 115 | } |
| 116 | stackp += bytes; |
| 117 | return rv; |
| 118 | } |
| 119 | |
| 120 | static void |
| 121 | read_target (char *buffer, int address, int count, int asciiz) |
| 122 | { |
| 123 | char byte; |
| 124 | while (count > 0) |
| 125 | { |
| 126 | byte = mem_get_qi (address++); |
| 127 | *buffer++ = byte; |
| 128 | if (asciiz && (byte == 0)) |
| 129 | return; |
| 130 | count--; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | static void |
| 135 | write_target (char *buffer, int address, int count, int asciiz) |
| 136 | { |
| 137 | char byte; |
| 138 | while (count > 0) |
| 139 | { |
| 140 | byte = *buffer++; |
| 141 | mem_put_qi (address++, byte); |
| 142 | if (asciiz && (byte == 0)) |
| 143 | return; |
| 144 | count--; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | #define PTRSZ (A16 ? 2 : 3) |
| 149 | |
| 150 | static char *callnames[] = { |
| 151 | "SYS_zero", |
| 152 | "SYS_exit", |
| 153 | "SYS_open", |
| 154 | "SYS_close", |
| 155 | "SYS_read", |
| 156 | "SYS_write", |
| 157 | "SYS_lseek", |
| 158 | "SYS_unlink", |
| 159 | "SYS_getpid", |
| 160 | "SYS_kill", |
| 161 | "SYS_fstat", |
| 162 | "SYS_sbrk", |
| 163 | "SYS_argvlen", |
| 164 | "SYS_argv", |
| 165 | "SYS_chdir", |
| 166 | "SYS_stat", |
| 167 | "SYS_chmod", |
| 168 | "SYS_utime", |
| 169 | "SYS_time", |
| 170 | "SYS_gettimeofday", |
| 171 | "SYS_times", |
| 172 | "SYS_link" |
| 173 | }; |
| 174 | |
| 175 | void |
| 176 | m32c_syscall (int id) |
| 177 | { |
| 178 | static char buf[256]; |
| 179 | int rv; |
| 180 | |
| 181 | argp = 0; |
| 182 | stackp = A16 ? 3 : 4; |
| 183 | if (trace) |
| 184 | printf ("\033[31m/* SYSCALL(%d) = %s */\033[0m\n", id, callnames[id]); |
| 185 | switch (id) |
| 186 | { |
| 187 | case SYS_exit: |
| 188 | { |
| 189 | int ec = arg (2); |
| 190 | if (verbose) |
| 191 | printf ("[exit %d]\n", ec); |
| 192 | step_result = M32C_MAKE_EXITED (ec); |
| 193 | } |
| 194 | break; |
| 195 | |
| 196 | case SYS_open: |
| 197 | { |
| 198 | int path = arg (PTRSZ); |
| 199 | int oflags = arg (2); |
| 200 | int cflags = arg (2); |
| 201 | |
| 202 | read_target (buf, path, 256, 1); |
| 203 | if (trace) |
| 204 | printf ("open(\"%s\",0x%x,%#o) = ", buf, oflags, cflags); |
| 205 | |
| 206 | if (callbacks) |
| 207 | /* The callback vector ignores CFLAGS. */ |
| 208 | rv = callbacks->open (callbacks, buf, oflags); |
| 209 | else |
| 210 | { |
| 211 | int h_oflags = 0; |
| 212 | |
| 213 | if (oflags & 0x0001) |
| 214 | h_oflags |= O_WRONLY; |
| 215 | if (oflags & 0x0002) |
| 216 | h_oflags |= O_RDWR; |
| 217 | if (oflags & 0x0200) |
| 218 | h_oflags |= O_CREAT; |
| 219 | if (oflags & 0x0008) |
| 220 | h_oflags |= O_APPEND; |
| 221 | if (oflags & 0x0400) |
| 222 | h_oflags |= O_TRUNC; |
| 223 | rv = open (buf, h_oflags, cflags); |
| 224 | } |
| 225 | if (trace) |
| 226 | printf ("%d\n", rv); |
| 227 | put_reg (r0, rv); |
| 228 | } |
| 229 | break; |
| 230 | |
| 231 | case SYS_close: |
| 232 | { |
| 233 | int fd = arg (2); |
| 234 | |
| 235 | if (callbacks) |
| 236 | rv = callbacks->close (callbacks, fd); |
| 237 | else if (fd > 2) |
| 238 | rv = close (fd); |
| 239 | else |
| 240 | rv = 0; |
| 241 | if (trace) |
| 242 | printf ("close(%d) = %d\n", fd, rv); |
| 243 | put_reg (r0, rv); |
| 244 | } |
| 245 | break; |
| 246 | |
| 247 | case SYS_read: |
| 248 | { |
| 249 | int fd = arg (2); |
| 250 | int addr = arg (PTRSZ); |
| 251 | int count = arg (2); |
| 252 | |
| 253 | if (count > sizeof (buf)) |
| 254 | count = sizeof (buf); |
| 255 | if (callbacks) |
| 256 | rv = callbacks->read (callbacks, fd, buf, count); |
| 257 | else |
| 258 | rv = read (fd, buf, count); |
| 259 | if (trace) |
| 260 | printf ("read(%d,%d) = %d\n", fd, count, rv); |
| 261 | if (rv > 0) |
| 262 | write_target (buf, addr, rv, 0); |
| 263 | put_reg (r0, rv); |
| 264 | } |
| 265 | break; |
| 266 | |
| 267 | case SYS_write: |
| 268 | { |
| 269 | int fd = arg (2); |
| 270 | int addr = arg (PTRSZ); |
| 271 | int count = arg (2); |
| 272 | |
| 273 | if (count > sizeof (buf)) |
| 274 | count = sizeof (buf); |
| 275 | if (trace) |
| 276 | printf ("write(%d,0x%x,%d)\n", fd, addr, count); |
| 277 | read_target (buf, addr, count, 0); |
| 278 | if (trace) |
| 279 | fflush (stdout); |
| 280 | if (callbacks) |
| 281 | rv = callbacks->write (callbacks, fd, buf, count); |
| 282 | else |
| 283 | rv = write (fd, buf, count); |
| 284 | if (trace) |
| 285 | printf ("write(%d,%d) = %d\n", fd, count, rv); |
| 286 | put_reg (r0, rv); |
| 287 | } |
| 288 | break; |
| 289 | |
| 290 | case SYS_getpid: |
| 291 | put_reg (r0, 42); |
| 292 | break; |
| 293 | |
| 294 | case SYS_gettimeofday: |
| 295 | { |
| 296 | int tvaddr = arg (PTRSZ); |
| 297 | struct timeval tv; |
| 298 | |
| 299 | rv = gettimeofday (&tv, 0); |
| 300 | if (trace) |
| 301 | printf ("gettimeofday: %ld sec %ld usec to 0x%x\n", tv.tv_sec, |
| 302 | tv.tv_usec, tvaddr); |
| 303 | mem_put_si (tvaddr, tv.tv_sec); |
| 304 | mem_put_si (tvaddr + 4, tv.tv_usec); |
| 305 | put_reg (r0, rv); |
| 306 | } |
| 307 | break; |
| 308 | |
| 309 | case SYS_kill: |
| 310 | { |
| 311 | int pid = arg (2); |
| 312 | int sig = arg (2); |
| 313 | if (pid == 42) |
| 314 | { |
| 315 | if (verbose) |
| 316 | printf ("[signal %d]\n", sig); |
| 317 | step_result = M32C_MAKE_STOPPED (sig); |
| 318 | } |
| 319 | } |
| 320 | break; |
| 321 | |
| 322 | case 11: |
| 323 | { |
| 324 | int heaptop_arg = arg (PTRSZ); |
| 325 | if (trace) |
| 326 | printf ("sbrk: heap top set to %x\n", heaptop_arg); |
| 327 | heaptop = heaptop_arg; |
| 328 | if (heapbottom == 0) |
| 329 | heapbottom = heaptop_arg; |
| 330 | } |
| 331 | break; |
| 332 | |
| 333 | } |
| 334 | } |