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qemu/target/mips/mips-semi.c
Alex Bennée f1672e6f2b semihosting: move semihosting configuration into its own directory 
In preparation for having some more common semihosting code let's
excise the current config magic from vl.c into its own file. We shall
later add more conditionals to the build configurations so we can
avoid building this if we don't need it.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-05-28 10:28:50 +01:00

375 lines
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/*
* Unified Hosting Interface syscalls.
*
* Copyright (c) 2015 Imagination Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/log.h"
#include "exec/helper-proto.h"
#include "exec/softmmu-semi.h"
#include "hw/semihosting/semihost.h"
typedef enum UHIOp {
UHI_exit = 1,
UHI_open = 2,
UHI_close = 3,
UHI_read = 4,
UHI_write = 5,
UHI_lseek = 6,
UHI_unlink = 7,
UHI_fstat = 8,
UHI_argc = 9,
UHI_argnlen = 10,
UHI_argn = 11,
UHI_plog = 13,
UHI_assert = 14,
UHI_pread = 19,
UHI_pwrite = 20,
UHI_link = 22
} UHIOp;
typedef struct UHIStat {
int16_t uhi_st_dev;
uint16_t uhi_st_ino;
uint32_t uhi_st_mode;
uint16_t uhi_st_nlink;
uint16_t uhi_st_uid;
uint16_t uhi_st_gid;
int16_t uhi_st_rdev;
uint64_t uhi_st_size;
uint64_t uhi_st_atime;
uint64_t uhi_st_spare1;
uint64_t uhi_st_mtime;
uint64_t uhi_st_spare2;
uint64_t uhi_st_ctime;
uint64_t uhi_st_spare3;
uint64_t uhi_st_blksize;
uint64_t uhi_st_blocks;
uint64_t uhi_st_spare4[2];
} UHIStat;
enum UHIOpenFlags {
UHIOpen_RDONLY = 0x0,
UHIOpen_WRONLY = 0x1,
UHIOpen_RDWR = 0x2,
UHIOpen_APPEND = 0x8,
UHIOpen_CREAT = 0x200,
UHIOpen_TRUNC = 0x400,
UHIOpen_EXCL = 0x800
};
/* Errno values taken from asm-mips/errno.h */
static uint16_t host_to_mips_errno[] = {
[ENAMETOOLONG] = 78,
#ifdef EOVERFLOW
[EOVERFLOW] = 79,
#endif
#ifdef ELOOP
[ELOOP] = 90,
#endif
};
static int errno_mips(int err)
{
if (err < 0 || err >= ARRAY_SIZE(host_to_mips_errno)) {
return EINVAL;
} else if (host_to_mips_errno[err]) {
return host_to_mips_errno[err];
} else {
return err;
}
}
static int copy_stat_to_target(CPUMIPSState *env, const struct stat *src,
target_ulong vaddr)
{
hwaddr len = sizeof(struct UHIStat);
UHIStat *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
if (!dst) {
errno = EFAULT;
return -1;
}
dst->uhi_st_dev = tswap16(src->st_dev);
dst->uhi_st_ino = tswap16(src->st_ino);
dst->uhi_st_mode = tswap32(src->st_mode);
dst->uhi_st_nlink = tswap16(src->st_nlink);
dst->uhi_st_uid = tswap16(src->st_uid);
dst->uhi_st_gid = tswap16(src->st_gid);
dst->uhi_st_rdev = tswap16(src->st_rdev);
dst->uhi_st_size = tswap64(src->st_size);
dst->uhi_st_atime = tswap64(src->st_atime);
dst->uhi_st_mtime = tswap64(src->st_mtime);
dst->uhi_st_ctime = tswap64(src->st_ctime);
#ifdef _WIN32
dst->uhi_st_blksize = 0;
dst->uhi_st_blocks = 0;
#else
dst->uhi_st_blksize = tswap64(src->st_blksize);
dst->uhi_st_blocks = tswap64(src->st_blocks);
#endif
unlock_user(dst, vaddr, len);
return 0;
}
static int get_open_flags(target_ulong target_flags)
{
int open_flags = 0;
if (target_flags & UHIOpen_RDWR) {
open_flags |= O_RDWR;
} else if (target_flags & UHIOpen_WRONLY) {
open_flags |= O_WRONLY;
} else {
open_flags |= O_RDONLY;
}
open_flags |= (target_flags & UHIOpen_APPEND) ? O_APPEND : 0;
open_flags |= (target_flags & UHIOpen_CREAT) ? O_CREAT : 0;
open_flags |= (target_flags & UHIOpen_TRUNC) ? O_TRUNC : 0;
open_flags |= (target_flags & UHIOpen_EXCL) ? O_EXCL : 0;
return open_flags;
}
static int write_to_file(CPUMIPSState *env, target_ulong fd, target_ulong vaddr,
target_ulong len, target_ulong offset)
{
int num_of_bytes;
void *dst = lock_user(VERIFY_READ, vaddr, len, 1);
if (!dst) {
errno = EFAULT;
return -1;
}
if (offset) {
#ifdef _WIN32
num_of_bytes = 0;
#else
num_of_bytes = pwrite(fd, dst, len, offset);
#endif
} else {
num_of_bytes = write(fd, dst, len);
}
unlock_user(dst, vaddr, 0);
return num_of_bytes;
}
static int read_from_file(CPUMIPSState *env, target_ulong fd,
target_ulong vaddr, target_ulong len,
target_ulong offset)
{
int num_of_bytes;
void *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
if (!dst) {
errno = EFAULT;
return -1;
}
if (offset) {
#ifdef _WIN32
num_of_bytes = 0;
#else
num_of_bytes = pread(fd, dst, len, offset);
#endif
} else {
num_of_bytes = read(fd, dst, len);
}
unlock_user(dst, vaddr, len);
return num_of_bytes;
}
static int copy_argn_to_target(CPUMIPSState *env, int arg_num,
target_ulong vaddr)
{
int strsize = strlen(semihosting_get_arg(arg_num)) + 1;
char *dst = lock_user(VERIFY_WRITE, vaddr, strsize, 0);
if (!dst) {
return -1;
}
strcpy(dst, semihosting_get_arg(arg_num));
unlock_user(dst, vaddr, strsize);
return 0;
}
#define GET_TARGET_STRING(p, addr) \
do { \
p = lock_user_string(addr); \
if (!p) { \
gpr[2] = -1; \
gpr[3] = EFAULT; \
goto uhi_done; \
} \
} while (0)
#define GET_TARGET_STRINGS_2(p, addr, p2, addr2) \
do { \
p = lock_user_string(addr); \
if (!p) { \
gpr[2] = -1; \
gpr[3] = EFAULT; \
goto uhi_done; \
} \
p2 = lock_user_string(addr2); \
if (!p2) { \
unlock_user(p, addr, 0); \
gpr[2] = -1; \
gpr[3] = EFAULT; \
goto uhi_done; \
} \
} while (0)
#define FREE_TARGET_STRING(p, gpr) \
do { \
unlock_user(p, gpr, 0); \
} while (0)
void helper_do_semihosting(CPUMIPSState *env)
{
target_ulong *gpr = env->active_tc.gpr;
const UHIOp op = gpr[25];
char *p, *p2;
switch (op) {
case UHI_exit:
qemu_log("UHI(%d): exit(%d)\n", op, (int)gpr[4]);
exit(gpr[4]);
case UHI_open:
GET_TARGET_STRING(p, gpr[4]);
if (!strcmp("/dev/stdin", p)) {
gpr[2] = 0;
} else if (!strcmp("/dev/stdout", p)) {
gpr[2] = 1;
} else if (!strcmp("/dev/stderr", p)) {
gpr[2] = 2;
} else {
gpr[2] = open(p, get_open_flags(gpr[5]), gpr[6]);
gpr[3] = errno_mips(errno);
}
FREE_TARGET_STRING(p, gpr[4]);
break;
case UHI_close:
if (gpr[4] < 3) {
/* ignore closing stdin/stdout/stderr */
gpr[2] = 0;
goto uhi_done;
}
gpr[2] = close(gpr[4]);
gpr[3] = errno_mips(errno);
break;
case UHI_read:
gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], 0);
gpr[3] = errno_mips(errno);
break;
case UHI_write:
gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], 0);
gpr[3] = errno_mips(errno);
break;
case UHI_lseek:
gpr[2] = lseek(gpr[4], gpr[5], gpr[6]);
gpr[3] = errno_mips(errno);
break;
case UHI_unlink:
GET_TARGET_STRING(p, gpr[4]);
gpr[2] = remove(p);
gpr[3] = errno_mips(errno);
FREE_TARGET_STRING(p, gpr[4]);
break;
case UHI_fstat:
{
struct stat sbuf;
memset(&sbuf, 0, sizeof(sbuf));
gpr[2] = fstat(gpr[4], &sbuf);
gpr[3] = errno_mips(errno);
if (gpr[2]) {
goto uhi_done;
}
gpr[2] = copy_stat_to_target(env, &sbuf, gpr[5]);
gpr[3] = errno_mips(errno);
}
break;
case UHI_argc:
gpr[2] = semihosting_get_argc();
break;
case UHI_argnlen:
if (gpr[4] >= semihosting_get_argc()) {
gpr[2] = -1;
goto uhi_done;
}
gpr[2] = strlen(semihosting_get_arg(gpr[4]));
break;
case UHI_argn:
if (gpr[4] >= semihosting_get_argc()) {
gpr[2] = -1;
goto uhi_done;
}
gpr[2] = copy_argn_to_target(env, gpr[4], gpr[5]);
break;
case UHI_plog:
GET_TARGET_STRING(p, gpr[4]);
p2 = strstr(p, "%d");
if (p2) {
int char_num = p2 - p;
char *buf = g_malloc(char_num + 1);
strncpy(buf, p, char_num);
buf[char_num] = '\0';
gpr[2] = printf("%s%d%s", buf, (int)gpr[5], p2 + 2);
g_free(buf);
} else {
gpr[2] = printf("%s", p);
}
FREE_TARGET_STRING(p, gpr[4]);
break;
case UHI_assert:
GET_TARGET_STRINGS_2(p, gpr[4], p2, gpr[5]);
printf("assertion '");
printf("\"%s\"", p);
printf("': file \"%s\", line %d\n", p2, (int)gpr[6]);
FREE_TARGET_STRING(p2, gpr[5]);
FREE_TARGET_STRING(p, gpr[4]);
abort();
break;
case UHI_pread:
gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
gpr[3] = errno_mips(errno);
break;
case UHI_pwrite:
gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
gpr[3] = errno_mips(errno);
break;
#ifndef _WIN32
case UHI_link:
GET_TARGET_STRINGS_2(p, gpr[4], p2, gpr[5]);
gpr[2] = link(p, p2);
gpr[3] = errno_mips(errno);
FREE_TARGET_STRING(p2, gpr[5]);
FREE_TARGET_STRING(p, gpr[4]);
break;
#endif
default:
fprintf(stderr, "Unknown UHI operation %d\n", op);
abort();
}
uhi_done:
return;
}
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