/* * m68k/ColdFire Semihosting syscall interface * * Copyright (c) 2005-2007 CodeSourcery. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <sys/types.h> #include <sys/stat.h> #include <errno.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <sys/time.h> #include <time.h> #include "cpu.h" #if defined(CONFIG_USER_ONLY) #include "qemu.h" #define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024) #else #include "qemu-common.h" #include "sysemu.h" #include "gdbstub.h" #include "softmmu-semi.h" #endif #define HOSTED_EXIT 0 #define HOSTED_INIT_SIM 1 #define HOSTED_OPEN 2 #define HOSTED_CLOSE 3 #define HOSTED_READ 4 #define HOSTED_WRITE 5 #define HOSTED_LSEEK 6 #define HOSTED_RENAME 7 #define HOSTED_UNLINK 8 #define HOSTED_STAT 9 #define HOSTED_FSTAT 10 #define HOSTED_GETTIMEOFDAY 11 #define HOSTED_ISATTY 12 #define HOSTED_SYSTEM 13 typedef uint32_t gdb_mode_t; typedef uint32_t gdb_time_t; struct m68k_gdb_stat { uint32_t gdb_st_dev; /* device */ uint32_t gdb_st_ino; /* inode */ gdb_mode_t gdb_st_mode; /* protection */ uint32_t gdb_st_nlink; /* number of hard links */ uint32_t gdb_st_uid; /* user ID of owner */ uint32_t gdb_st_gid; /* group ID of owner */ uint32_t gdb_st_rdev; /* device type (if inode device) */ uint64_t gdb_st_size; /* total size, in bytes */ uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */ uint64_t gdb_st_blocks; /* number of blocks allocated */ gdb_time_t gdb_st_atime; /* time of last access */ gdb_time_t gdb_st_mtime; /* time of last modification */ gdb_time_t gdb_st_ctime; /* time of last change */ } __attribute__((packed)); struct gdb_timeval { gdb_time_t tv_sec; /* second */ uint64_t tv_usec; /* microsecond */ } __attribute__((packed)); #define GDB_O_RDONLY 0x0 #define GDB_O_WRONLY 0x1 #define GDB_O_RDWR 0x2 #define GDB_O_APPEND 0x8 #define GDB_O_CREAT 0x200 #define GDB_O_TRUNC 0x400 #define GDB_O_EXCL 0x800 static int translate_openflags(int flags) { int hf; if (flags & GDB_O_WRONLY) hf = O_WRONLY; else if (flags & GDB_O_RDWR) hf = O_RDWR; else hf = O_RDONLY; if (flags & GDB_O_APPEND) hf |= O_APPEND; if (flags & GDB_O_CREAT) hf |= O_CREAT; if (flags & GDB_O_TRUNC) hf |= O_TRUNC; if (flags & GDB_O_EXCL) hf |= O_EXCL; return hf; } static void translate_stat(CPUState *env, target_ulong addr, struct stat *s) { struct m68k_gdb_stat *p; if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0))) /* FIXME - should this return an error code? */ return; p->gdb_st_dev = cpu_to_be32(s->st_dev); p->gdb_st_ino = cpu_to_be32(s->st_ino); p->gdb_st_mode = cpu_to_be32(s->st_mode); p->gdb_st_nlink = cpu_to_be32(s->st_nlink); p->gdb_st_uid = cpu_to_be32(s->st_uid); p->gdb_st_gid = cpu_to_be32(s->st_gid); p->gdb_st_rdev = cpu_to_be32(s->st_rdev); p->gdb_st_size = cpu_to_be64(s->st_size); #ifdef _WIN32 /* Windows stat is missing some fields. */ p->gdb_st_blksize = 0; p->gdb_st_blocks = 0; #else p->gdb_st_blksize = cpu_to_be64(s->st_blksize); p->gdb_st_blocks = cpu_to_be64(s->st_blocks); #endif p->gdb_st_atime = cpu_to_be32(s->st_atime); p->gdb_st_mtime = cpu_to_be32(s->st_mtime); p->gdb_st_ctime = cpu_to_be32(s->st_ctime); unlock_user(p, addr, sizeof(struct m68k_gdb_stat)); } static int m68k_semi_is_fseek; static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err) { target_ulong args; args = env->dregs[1]; if (m68k_semi_is_fseek) { /* FIXME: We've already lost the high bits of the fseek return value. */ /* FIXME - handle put_user() failure */ put_user_u32(0, args); args += 4; m68k_semi_is_fseek = 0; } /* FIXME - handle put_user() failure */ put_user_u32(ret, args); put_user_u32(errno, args + 4); } #define ARG(n) \ ({ \ target_ulong __arg; \ /* FIXME - handle get_user() failure */ \ get_user_ual(__arg, args + (n) * 4); \ __arg; \ }) #define PARG(x) ((unsigned long)ARG(x)) void do_m68k_semihosting(CPUM68KState *env, int nr) { uint32_t args; void *p; void *q; uint32_t len; uint32_t result; args = env->dregs[1]; switch (nr) { case HOSTED_EXIT: exit(env->dregs[0]); case HOSTED_OPEN: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1), ARG(2), ARG(3)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = open(p, translate_openflags(ARG(2)), ARG(3)); unlock_user(p, ARG(0), 0); } } break; case HOSTED_CLOSE: { /* Ignore attempts to close stdin/out/err. */ int fd = ARG(0); if (fd > 2) { if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0)); return; } else { result = close(fd); } } else { result = 0; } break; } case HOSTED_READ: len = ARG(2); if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len); return; } else { if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) { /* FIXME - check error code? */ result = -1; } else { result = read(ARG(0), p, len); unlock_user(p, ARG(1), len); } } break; case HOSTED_WRITE: len = ARG(2); if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len); return; } else { if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) { /* FIXME - check error code? */ result = -1; } else { result = write(ARG(0), p, len); unlock_user(p, ARG(0), 0); } } break; case HOSTED_LSEEK: { uint64_t off; off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32); if (use_gdb_syscalls()) { m68k_semi_is_fseek = 1; gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x", ARG(0), off, ARG(3)); } else { off = lseek(ARG(0), off, ARG(3)); /* FIXME - handle put_user() failure */ put_user_u32(off >> 32, args); put_user_u32(off, args + 4); put_user_u32(errno, args + 8); } return; } case HOSTED_RENAME: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "rename,%s,%s", ARG(0), (int)ARG(1), ARG(2), (int)ARG(3)); return; } else { p = lock_user_string(ARG(0)); q = lock_user_string(ARG(2)); if (!p || !q) { /* FIXME - check error code? */ result = -1; } else { result = rename(p, q); } unlock_user(p, ARG(0), 0); unlock_user(q, ARG(2), 0); } break; case HOSTED_UNLINK: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = unlink(p); unlock_user(p, ARG(0), 0); } } break; case HOSTED_STAT: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "stat,%s,%x", ARG(0), (int)ARG(1), ARG(2)); return; } else { struct stat s; if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = stat(p, &s); unlock_user(p, ARG(0), 0); } if (result == 0) { translate_stat(env, ARG(2), &s); } } break; case HOSTED_FSTAT: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x", ARG(0), ARG(1)); return; } else { struct stat s; result = fstat(ARG(0), &s); if (result == 0) { translate_stat(env, ARG(1), &s); } } break; case HOSTED_GETTIMEOFDAY: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x", ARG(0), ARG(1)); return; } else { qemu_timeval tv; struct gdb_timeval *p; result = qemu_gettimeofday(&tv); if (result != 0) { if (!(p = lock_user(VERIFY_WRITE, ARG(0), sizeof(struct gdb_timeval), 0))) { /* FIXME - check error code? */ result = -1; } else { p->tv_sec = cpu_to_be32(tv.tv_sec); p->tv_usec = cpu_to_be64(tv.tv_usec); unlock_user(p, ARG(0), sizeof(struct gdb_timeval)); } } } break; case HOSTED_ISATTY: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0)); return; } else { result = isatty(ARG(0)); } break; case HOSTED_SYSTEM: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "system,%s", ARG(0), (int)ARG(1)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = system(p); unlock_user(p, ARG(0), 0); } } break; case HOSTED_INIT_SIM: #if defined(CONFIG_USER_ONLY) { TaskState *ts = env->opaque; /* Allocate the heap using sbrk. */ if (!ts->heap_limit) { long ret; uint32_t size; uint32_t base; base = do_brk(0); size = SEMIHOSTING_HEAP_SIZE; /* Try a big heap, and reduce the size if that fails. */ for (;;) { ret = do_brk(base + size); if (ret != -1) break; size >>= 1; } ts->heap_limit = base + size; } /* This call may happen before we have writable memory, so return values directly in registers. */ env->dregs[1] = ts->heap_limit; env->aregs[7] = ts->stack_base; } #else /* FIXME: This is wrong for boards where RAM does not start at address zero. */ env->dregs[1] = ram_size; env->aregs[7] = ram_size; #endif return; default: cpu_abort(env, "Unsupported semihosting syscall %d\n", nr); result = 0; } /* FIXME - handle put_user() failure */ put_user_u32(result, args); put_user_u32(errno, args + 4); }