456 lines
13 KiB
C
456 lines
13 KiB
C
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/*
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* Nios II Semihosting syscall interface.
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* This code is derived from m68k-semi.c.
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* The semihosting protocol implemented here is described in the
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* libgloss sources:
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* https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=libgloss/nios2/nios2-semi.txt;hb=HEAD
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*
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* Copyright (c) 2017-2019 Mentor Graphics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#if defined(CONFIG_USER_ONLY)
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#include "qemu.h"
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#else
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#include "qemu-common.h"
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#include "exec/gdbstub.h"
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#include "exec/softmmu-semi.h"
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#endif
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#include "qemu/log.h"
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#include "sysemu/sysemu.h"
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#define HOSTED_EXIT 0
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#define HOSTED_INIT_SIM 1
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#define HOSTED_OPEN 2
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#define HOSTED_CLOSE 3
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#define HOSTED_READ 4
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#define HOSTED_WRITE 5
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#define HOSTED_LSEEK 6
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#define HOSTED_RENAME 7
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#define HOSTED_UNLINK 8
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#define HOSTED_STAT 9
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#define HOSTED_FSTAT 10
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#define HOSTED_GETTIMEOFDAY 11
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#define HOSTED_ISATTY 12
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#define HOSTED_SYSTEM 13
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typedef uint32_t gdb_mode_t;
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typedef uint32_t gdb_time_t;
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struct nios2_gdb_stat {
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uint32_t gdb_st_dev; /* device */
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uint32_t gdb_st_ino; /* inode */
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gdb_mode_t gdb_st_mode; /* protection */
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uint32_t gdb_st_nlink; /* number of hard links */
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uint32_t gdb_st_uid; /* user ID of owner */
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uint32_t gdb_st_gid; /* group ID of owner */
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uint32_t gdb_st_rdev; /* device type (if inode device) */
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uint64_t gdb_st_size; /* total size, in bytes */
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uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
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uint64_t gdb_st_blocks; /* number of blocks allocated */
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gdb_time_t gdb_st_atime; /* time of last access */
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gdb_time_t gdb_st_mtime; /* time of last modification */
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gdb_time_t gdb_st_ctime; /* time of last change */
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} QEMU_PACKED;
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struct gdb_timeval {
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gdb_time_t tv_sec; /* second */
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uint64_t tv_usec; /* microsecond */
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} QEMU_PACKED;
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#define GDB_O_RDONLY 0x0
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#define GDB_O_WRONLY 0x1
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#define GDB_O_RDWR 0x2
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#define GDB_O_APPEND 0x8
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#define GDB_O_CREAT 0x200
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#define GDB_O_TRUNC 0x400
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#define GDB_O_EXCL 0x800
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static int translate_openflags(int flags)
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{
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int hf;
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if (flags & GDB_O_WRONLY) {
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hf = O_WRONLY;
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} else if (flags & GDB_O_RDWR) {
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hf = O_RDWR;
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} else {
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hf = O_RDONLY;
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}
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if (flags & GDB_O_APPEND) {
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hf |= O_APPEND;
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}
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if (flags & GDB_O_CREAT) {
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hf |= O_CREAT;
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}
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if (flags & GDB_O_TRUNC) {
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hf |= O_TRUNC;
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}
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if (flags & GDB_O_EXCL) {
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hf |= O_EXCL;
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}
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return hf;
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}
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static bool translate_stat(CPUNios2State *env, target_ulong addr,
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struct stat *s)
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{
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struct nios2_gdb_stat *p;
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p = lock_user(VERIFY_WRITE, addr, sizeof(struct nios2_gdb_stat), 0);
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if (!p) {
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return false;
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}
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p->gdb_st_dev = cpu_to_be32(s->st_dev);
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p->gdb_st_ino = cpu_to_be32(s->st_ino);
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p->gdb_st_mode = cpu_to_be32(s->st_mode);
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p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
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p->gdb_st_uid = cpu_to_be32(s->st_uid);
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p->gdb_st_gid = cpu_to_be32(s->st_gid);
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p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
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p->gdb_st_size = cpu_to_be64(s->st_size);
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#ifdef _WIN32
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/* Windows stat is missing some fields. */
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p->gdb_st_blksize = 0;
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p->gdb_st_blocks = 0;
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#else
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p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
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p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
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#endif
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p->gdb_st_atime = cpu_to_be32(s->st_atime);
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p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
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p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
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unlock_user(p, addr, sizeof(struct nios2_gdb_stat));
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return true;
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}
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static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret,
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uint32_t err)
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{
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target_ulong args = env->regs[R_ARG1];
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if (put_user_u32(ret, args) ||
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put_user_u32(err, args + 4)) {
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/*
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* The nios2 semihosting ABI does not provide any way to report this
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* error to the guest, so the best we can do is log it in qemu.
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* It is always a guest error not to pass us a valid argument block.
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*/
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qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value "
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"discarded because argument block not writable\n");
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}
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}
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static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret,
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uint32_t err)
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{
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target_ulong args = env->regs[R_ARG1];
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if (put_user_u32(ret >> 32, args) ||
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put_user_u32(ret, args + 4) ||
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put_user_u32(err, args + 8)) {
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/* No way to report this via nios2 semihosting ABI; just log it */
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qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value "
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"discarded because argument block not writable\n");
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}
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}
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static int nios2_semi_is_lseek;
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static void nios2_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUNios2State *env = &cpu->env;
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if (nios2_semi_is_lseek) {
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/*
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* FIXME: We've already lost the high bits of the lseek
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* return value.
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*/
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nios2_semi_return_u64(env, ret, err);
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nios2_semi_is_lseek = 0;
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} else {
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nios2_semi_return_u32(env, ret, err);
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}
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}
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/*
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* Read the input value from the argument block; fail the semihosting
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* call if the memory read fails.
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*/
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#define GET_ARG(n) do { \
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if (get_user_ual(arg ## n, args + (n) * 4)) { \
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result = -1; \
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errno = EFAULT; \
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goto failed; \
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} \
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} while (0)
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void do_nios2_semihosting(CPUNios2State *env)
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{
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int nr;
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uint32_t args;
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target_ulong arg0, arg1, arg2, arg3;
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void *p;
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void *q;
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uint32_t len;
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uint32_t result;
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nr = env->regs[R_ARG0];
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args = env->regs[R_ARG1];
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switch (nr) {
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case HOSTED_EXIT:
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gdb_exit(env, env->regs[R_ARG0]);
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exit(env->regs[R_ARG0]);
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case HOSTED_OPEN:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
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arg2, arg3);
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return;
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} else {
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p = lock_user_string(arg0);
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if (!p) {
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result = -1;
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errno = EFAULT;
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} else {
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result = open(p, translate_openflags(arg2), arg3);
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unlock_user(p, arg0, 0);
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}
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}
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break;
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case HOSTED_CLOSE:
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{
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/* Ignore attempts to close stdin/out/err. */
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GET_ARG(0);
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int fd = arg0;
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if (fd > 2) {
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "close,%x", arg0);
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return;
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} else {
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result = close(fd);
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}
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} else {
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result = 0;
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}
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break;
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}
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case HOSTED_READ:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2;
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "read,%x,%x,%x",
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arg0, arg1, len);
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return;
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} else {
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p = lock_user(VERIFY_WRITE, arg1, len, 0);
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if (!p) {
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result = -1;
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errno = EFAULT;
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} else {
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result = read(arg0, p, len);
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unlock_user(p, arg1, len);
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}
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}
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break;
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case HOSTED_WRITE:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2;
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "write,%x,%x,%x",
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arg0, arg1, len);
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return;
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} else {
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p = lock_user(VERIFY_READ, arg1, len, 1);
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if (!p) {
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result = -1;
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errno = EFAULT;
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} else {
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result = write(arg0, p, len);
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unlock_user(p, arg0, 0);
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}
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}
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break;
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case HOSTED_LSEEK:
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{
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uint64_t off;
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
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if (use_gdb_syscalls()) {
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nios2_semi_is_lseek = 1;
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gdb_do_syscall(nios2_semi_cb, "lseek,%x,%lx,%x",
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arg0, off, arg3);
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} else {
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off = lseek(arg0, off, arg3);
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nios2_semi_return_u64(env, off, errno);
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}
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return;
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}
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case HOSTED_RENAME:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "rename,%s,%s",
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arg0, (int)arg1, arg2, (int)arg3);
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return;
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} else {
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p = lock_user_string(arg0);
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q = lock_user_string(arg2);
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if (!p || !q) {
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result = -1;
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errno = EFAULT;
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} else {
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result = rename(p, q);
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}
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unlock_user(p, arg0, 0);
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unlock_user(q, arg2, 0);
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}
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break;
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case HOSTED_UNLINK:
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GET_ARG(0);
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GET_ARG(1);
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if (use_gdb_syscalls()) {
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gdb_do_syscall(nios2_semi_cb, "unlink,%s",
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arg0, (int)arg1);
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return;
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} else {
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p = lock_user_string(arg0);
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if (!p) {
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result = -1;
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errno = EFAULT;
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} else {
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result = unlink(p);
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unlock_user(p, arg0, 0);
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}
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}
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break;
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case HOSTED_STAT:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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|
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);
|
||
|
|
}
|