| /* |
| * Nios II Semihosting syscall interface. |
| * This code is derived from m68k-semi.c. |
| * The semihosting protocol implemented here is described in the |
| * libgloss sources: |
| * https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=libgloss/nios2/nios2-semi.txt;hb=HEAD |
| * |
| * Copyright (c) 2017-2019 Mentor Graphics |
| * |
| * 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| |
| #include "cpu.h" |
| #if defined(CONFIG_USER_ONLY) |
| #include "qemu.h" |
| #else |
| #include "qemu-common.h" |
| #include "exec/gdbstub.h" |
| #include "exec/softmmu-semi.h" |
| #endif |
| #include "qemu/log.h" |
| |
| #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 nios2_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 */ |
| } QEMU_PACKED; |
| |
| struct gdb_timeval { |
| gdb_time_t tv_sec; /* second */ |
| uint64_t tv_usec; /* microsecond */ |
| } QEMU_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 bool translate_stat(CPUNios2State *env, target_ulong addr, |
| struct stat *s) |
| { |
| struct nios2_gdb_stat *p; |
| |
| p = lock_user(VERIFY_WRITE, addr, sizeof(struct nios2_gdb_stat), 0); |
| |
| if (!p) { |
| return false; |
| } |
| 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 nios2_gdb_stat)); |
| return true; |
| } |
| |
| static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret, |
| uint32_t err) |
| { |
| target_ulong args = env->regs[R_ARG1]; |
| if (put_user_u32(ret, args) || |
| put_user_u32(err, args + 4)) { |
| /* |
| * The nios2 semihosting ABI does not provide any way to report this |
| * error to the guest, so the best we can do is log it in qemu. |
| * It is always a guest error not to pass us a valid argument block. |
| */ |
| qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value " |
| "discarded because argument block not writable\n"); |
| } |
| } |
| |
| static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret, |
| uint32_t err) |
| { |
| target_ulong args = env->regs[R_ARG1]; |
| if (put_user_u32(ret >> 32, args) || |
| put_user_u32(ret, args + 4) || |
| put_user_u32(err, args + 8)) { |
| /* No way to report this via nios2 semihosting ABI; just log it */ |
| qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value " |
| "discarded because argument block not writable\n"); |
| } |
| } |
| |
| static int nios2_semi_is_lseek; |
| |
| static void nios2_semi_cb(CPUState *cs, target_ulong ret, target_ulong err) |
| { |
| Nios2CPU *cpu = NIOS2_CPU(cs); |
| CPUNios2State *env = &cpu->env; |
| |
| if (nios2_semi_is_lseek) { |
| /* |
| * FIXME: We've already lost the high bits of the lseek |
| * return value. |
| */ |
| nios2_semi_return_u64(env, ret, err); |
| nios2_semi_is_lseek = 0; |
| } else { |
| nios2_semi_return_u32(env, ret, err); |
| } |
| } |
| |
| /* |
| * Read the input value from the argument block; fail the semihosting |
| * call if the memory read fails. |
| */ |
| #define GET_ARG(n) do { \ |
| if (get_user_ual(arg ## n, args + (n) * 4)) { \ |
| result = -1; \ |
| errno = EFAULT; \ |
| goto failed; \ |
| } \ |
| } while (0) |
| |
| void do_nios2_semihosting(CPUNios2State *env) |
| { |
| int nr; |
| uint32_t args; |
| target_ulong arg0, arg1, arg2, arg3; |
| void *p; |
| void *q; |
| uint32_t len; |
| uint32_t result; |
| |
| nr = env->regs[R_ARG0]; |
| args = env->regs[R_ARG1]; |
| switch (nr) { |
| case HOSTED_EXIT: |
| gdb_exit(env->regs[R_ARG0]); |
| exit(env->regs[R_ARG0]); |
| case HOSTED_OPEN: |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| GET_ARG(3); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "open,%s,%x,%x", arg0, (int)arg1, |
| arg2, arg3); |
| return; |
| } else { |
| p = lock_user_string(arg0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = open(p, translate_openflags(arg2), arg3); |
| unlock_user(p, arg0, 0); |
| } |
| } |
| break; |
| case HOSTED_CLOSE: |
| { |
| /* Ignore attempts to close stdin/out/err. */ |
| GET_ARG(0); |
| int fd = arg0; |
| if (fd > 2) { |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "close,%x", arg0); |
| return; |
| } else { |
| result = close(fd); |
| } |
| } else { |
| result = 0; |
| } |
| break; |
| } |
| case HOSTED_READ: |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| len = arg2; |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "read,%x,%x,%x", |
| arg0, arg1, len); |
| return; |
| } else { |
| p = lock_user(VERIFY_WRITE, arg1, len, 0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = read(arg0, p, len); |
| unlock_user(p, arg1, len); |
| } |
| } |
| break; |
| case HOSTED_WRITE: |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| len = arg2; |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "write,%x,%x,%x", |
| arg0, arg1, len); |
| return; |
| } else { |
| p = lock_user(VERIFY_READ, arg1, len, 1); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = write(arg0, p, len); |
| unlock_user(p, arg0, 0); |
| } |
| } |
| break; |
| case HOSTED_LSEEK: |
| { |
| uint64_t off; |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| GET_ARG(3); |
| off = (uint32_t)arg2 | ((uint64_t)arg1 << 32); |
| if (use_gdb_syscalls()) { |
| nios2_semi_is_lseek = 1; |
| gdb_do_syscall(nios2_semi_cb, "lseek,%x,%lx,%x", |
| arg0, off, arg3); |
| } else { |
| off = lseek(arg0, off, arg3); |
| nios2_semi_return_u64(env, off, errno); |
| } |
| return; |
| } |
| case HOSTED_RENAME: |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| GET_ARG(3); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "rename,%s,%s", |
| arg0, (int)arg1, arg2, (int)arg3); |
| return; |
| } else { |
| p = lock_user_string(arg0); |
| q = lock_user_string(arg2); |
| if (!p || !q) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = rename(p, q); |
| } |
| unlock_user(p, arg0, 0); |
| unlock_user(q, arg2, 0); |
| } |
| break; |
| case HOSTED_UNLINK: |
| GET_ARG(0); |
| GET_ARG(1); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "unlink,%s", |
| arg0, (int)arg1); |
| return; |
| } else { |
| p = lock_user_string(arg0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = unlink(p); |
| unlock_user(p, arg0, 0); |
| } |
| } |
| break; |
| case HOSTED_STAT: |
| GET_ARG(0); |
| GET_ARG(1); |
| GET_ARG(2); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "stat,%s,%x", |
| arg0, (int)arg1, arg2); |
| return; |
| } else { |
| struct stat s; |
| p = lock_user_string(arg0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = stat(p, &s); |
| unlock_user(p, arg0, 0); |
| } |
| if (result == 0 && !translate_stat(env, arg2, &s)) { |
| result = -1; |
| errno = EFAULT; |
| } |
| } |
| break; |
| case HOSTED_FSTAT: |
| GET_ARG(0); |
| GET_ARG(1); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "fstat,%x,%x", |
| arg0, arg1); |
| return; |
| } else { |
| struct stat s; |
| result = fstat(arg0, &s); |
| if (result == 0 && !translate_stat(env, arg1, &s)) { |
| result = -1; |
| errno = EFAULT; |
| } |
| } |
| break; |
| case HOSTED_GETTIMEOFDAY: |
| /* Only the tv parameter is used. tz is assumed NULL. */ |
| GET_ARG(0); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "gettimeofday,%x,%x", |
| arg0, 0); |
| return; |
| } else { |
| qemu_timeval tv; |
| struct gdb_timeval *p; |
| result = qemu_gettimeofday(&tv); |
| if (result != 0) { |
| p = lock_user(VERIFY_WRITE, arg0, sizeof(struct gdb_timeval), |
| 0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| p->tv_sec = cpu_to_be32(tv.tv_sec); |
| p->tv_usec = cpu_to_be64(tv.tv_usec); |
| unlock_user(p, arg0, sizeof(struct gdb_timeval)); |
| } |
| } |
| } |
| break; |
| case HOSTED_ISATTY: |
| GET_ARG(0); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "isatty,%x", arg0); |
| return; |
| } else { |
| result = isatty(arg0); |
| } |
| break; |
| case HOSTED_SYSTEM: |
| GET_ARG(0); |
| GET_ARG(1); |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(nios2_semi_cb, "system,%s", |
| arg0, (int)arg1); |
| return; |
| } else { |
| p = lock_user_string(arg0); |
| if (!p) { |
| result = -1; |
| errno = EFAULT; |
| } else { |
| result = system(p); |
| unlock_user(p, arg0, 0); |
| } |
| } |
| break; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: unsupported " |
| "semihosting syscall %d\n", nr); |
| result = 0; |
| } |
| failed: |
| nios2_semi_return_u32(env, result, errno); |
| } |
