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xemu/target/nios2/nios2-semi.c
Markus Armbruster d5938f29fe Clean up inclusion of sysemu/sysemu.h 
In my "build everything" tree, changing sysemu/sysemu.h triggers a
recompile of some 5400 out of 6600 objects (not counting tests and
objects that don't depend on qemu/osdep.h).

Almost a third of its inclusions are actually superfluous.  Delete
them.  Downgrade two more to qapi/qapi-types-run-state.h, and move one
from char/serial.h to char/serial.c.

hw/semihosting/config.c, monitor/monitor.c, qdev-monitor.c, and
stubs/semihost.c define variables declared in sysemu/sysemu.h without
including it.  The compiler is cool with that, but include it anyway.

This doesn't reduce actual use much, as it's still included into
widely included headers.  The next commit will tackle that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20190812052359.30071-27-armbru@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2019-08-16 13:31:53 +02:00

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/*
* 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, 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);
}
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