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/*
* semihosting.c -- ARM Semihoting API implementation
*
* Copyright (c) 2015 Zodiac Inflight Innovations
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* based on a smiliar code from U-Boot
* Copyright (c) 2014 Broadcom Corporation
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <common.h>
#include <command.h>
#include <fcntl.h>
#include <asm/semihosting.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
enum {
SEMIHOSTING_SYS_OPEN = 0x01,
SEMIHOSTING_SYS_CLOSE = 0x02,
SEMIHOSTING_SYS_WRITEC = 0x03,
SEMIHOSTING_SYS_WRITE0 = 0x04,
SEMIHOSTING_SYS_WRITE = 0x05,
SEMIHOSTING_SYS_READ = 0x06,
SEMIHOSTING_SYS_READC = 0x07,
/* SYS_ISERROR is not implemented */
SEMIHOSTING_SYS_ISATTY = 0x09,
SEMIHOSTING_SYS_SEEK = 0x0a,
SEMIHOSTING_SYS_FLEN = 0x0c,
SEMIHOSTING_SYS_REMOVE = 0x0e,
SEMIHOSTING_SYS_RENAME = 0x0f,
SEMIHOSTING_SYS_TIME = 0x11,
SEMIHOSTING_SYS_ERRNO = 0x13,
/* SYS_GET_CMDLINE is not implemented */
/* SYS_HEAPINFO is not implemented */
/* angel_SWIreason_ReportException is not implemented */
SEMIHOSTING_SYS_SYSTEM = 0x12,
};
uint32_t semihosting_trap(uint32_t sysnum, void *addr);
static uint32_t semihosting_flags_to_mode(int flags)
{
static const int semihosting_open_modeflags[12] = {
O_RDONLY,
O_RDONLY | O_BINARY,
O_RDWR,
O_RDWR | O_BINARY,
O_WRONLY | O_CREAT | O_TRUNC,
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
O_RDWR | O_CREAT | O_TRUNC,
O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
O_WRONLY | O_CREAT | O_APPEND,
O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
O_RDWR | O_CREAT | O_APPEND,
O_RDWR | O_CREAT | O_APPEND | O_BINARY
};
int i;
for (i = 0; i < ARRAY_SIZE(semihosting_open_modeflags); i++) {
if (semihosting_open_modeflags[i] == flags)
return i;
}
return 0;
}
int semihosting_open(const char *fname, int flags)
{
struct __packed {
uint32_t fname;
uint32_t mode;
uint32_t len;
} open = {
.fname = (uint32_t)fname,
.len = strlen(fname),
.mode = semihosting_flags_to_mode(flags),
};
return semihosting_trap(SEMIHOSTING_SYS_OPEN, &open);
}
EXPORT_SYMBOL(semihosting_open);
int semihosting_close(int fd)
{
return semihosting_trap(SEMIHOSTING_SYS_CLOSE, &fd);
}
EXPORT_SYMBOL(semihosting_close);
int semihosting_writec(char c)
{
return semihosting_trap(SEMIHOSTING_SYS_WRITEC, &c);
}
EXPORT_SYMBOL(semihosting_writec);
int semihosting_write0(const char *str)
{
return semihosting_trap(SEMIHOSTING_SYS_WRITE0, (void *)str);
}
EXPORT_SYMBOL(semihosting_write0);
struct __packed semihosting_file_io {
uint32_t fd;
uint32_t memp;
uint32_t len;
};
ssize_t semihosting_write(int fd, const void *buf, size_t count)
{
struct semihosting_file_io write = {
.fd = fd,
.memp = (uint32_t)buf,
.len = count,
};
return semihosting_trap(SEMIHOSTING_SYS_WRITE, &write);
}
EXPORT_SYMBOL(semihosting_write);
ssize_t semihosting_read(int fd, void *buf, size_t count)
{
struct semihosting_file_io read = {
.fd = fd,
.memp = (uint32_t)buf,
.len = count,
};
return semihosting_trap(SEMIHOSTING_SYS_READ, &read);
}
EXPORT_SYMBOL(semihosting_read);
int semihosting_readc(void)
{
return semihosting_trap(SEMIHOSTING_SYS_READC, NULL);
}
EXPORT_SYMBOL(semihosting_readc);
int semihosting_isatty(int fd)
{
return semihosting_trap(SEMIHOSTING_SYS_ISATTY, &fd);
}
EXPORT_SYMBOL(semihosting_isatty);
int semihosting_seek(int fd, loff_t pos)
{
struct __packed {
uint32_t fd;
uint32_t pos;
} seek = {
.fd = fd,
.pos = pos,
};
return semihosting_trap(SEMIHOSTING_SYS_SEEK, &seek);
}
EXPORT_SYMBOL(semihosting_seek);
int semihosting_flen(int fd)
{
return semihosting_trap(SEMIHOSTING_SYS_FLEN, &fd);
}
EXPORT_SYMBOL(semihosting_flen);
int semihosting_remove(const char *fname)
{
struct __packed {
uint32_t fname;
uint32_t fname_length;
} remove = {
.fname = (uint32_t)fname,
.fname_length = strlen(fname),
};
return semihosting_trap(SEMIHOSTING_SYS_REMOVE, &remove);
}
EXPORT_SYMBOL(semihosting_remove);
int semihosting_rename(const char *fname1, const char *fname2)
{
struct __packed {
uint32_t fname1;
uint32_t fname1_length;
uint32_t fname2;
uint32_t fname2_length;
} rename = {
.fname1 = (uint32_t)fname1,
.fname1_length = strlen(fname1),
.fname2 = (uint32_t)fname2,
.fname2_length = strlen(fname2),
};
return semihosting_trap(SEMIHOSTING_SYS_RENAME, &rename);
}
EXPORT_SYMBOL(semihosting_rename);
int semihosting_errno(void)
{
return semihosting_trap(SEMIHOSTING_SYS_ERRNO, NULL);
}
EXPORT_SYMBOL(semihosting_errno);
int semihosting_system(const char *command)
{
struct __packed {
uint32_t cmd;
uint32_t cmd_len;
} system = {
.cmd = (uint32_t)command,
.cmd_len = strlen(command),
};
return semihosting_trap(SEMIHOSTING_SYS_SYSTEM, &system);
}
EXPORT_SYMBOL(semihosting_system);
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