mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 21:54:01 +00:00
1c03ab9f4b
We factor out the arch-independent parts of the ARM semihosting implementation as a common library so that it can be shared with RISC-V. Signed-off-by: Kautuk Consul <kconsul@ventanamicro.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
186 lines
3.2 KiB
C
186 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
|
|
* Copyright 2014 Broadcom Corporation
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <log.h>
|
|
#include <semihosting.h>
|
|
|
|
#define SYSOPEN 0x01
|
|
#define SYSCLOSE 0x02
|
|
#define SYSWRITEC 0x03
|
|
#define SYSWRITE0 0x04
|
|
#define SYSWRITE 0x05
|
|
#define SYSREAD 0x06
|
|
#define SYSREADC 0x07
|
|
#define SYSISERROR 0x08
|
|
#define SYSSEEK 0x0A
|
|
#define SYSFLEN 0x0C
|
|
#define SYSERRNO 0x13
|
|
|
|
#if CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK)
|
|
static bool _semihosting_enabled = true;
|
|
static bool try_semihosting = true;
|
|
|
|
bool semihosting_enabled(void)
|
|
{
|
|
if (try_semihosting) {
|
|
smh_trap(SYSERRNO, NULL);
|
|
try_semihosting = false;
|
|
}
|
|
|
|
return _semihosting_enabled;
|
|
}
|
|
|
|
void disable_semihosting(void)
|
|
{
|
|
_semihosting_enabled = false;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* smh_errno() - Read the host's errno
|
|
*
|
|
* This gets the value of the host's errno and negates it. The host's errno may
|
|
* or may not be set, so only call this function if a previous semihosting call
|
|
* has failed.
|
|
*
|
|
* Return: a negative error value
|
|
*/
|
|
static int smh_errno(void)
|
|
{
|
|
long ret = smh_trap(SYSERRNO, NULL);
|
|
|
|
if (ret > 0 && ret < INT_MAX)
|
|
return -ret;
|
|
return -EIO;
|
|
}
|
|
|
|
long smh_open(const char *fname, enum smh_open_mode mode)
|
|
{
|
|
long fd;
|
|
struct smh_open_s {
|
|
const char *fname;
|
|
unsigned long mode;
|
|
size_t len;
|
|
} open;
|
|
|
|
debug("%s: file \'%s\', mode \'%u\'\n", __func__, fname, mode);
|
|
|
|
open.fname = fname;
|
|
open.len = strlen(fname);
|
|
open.mode = mode;
|
|
|
|
/* Open the file on the host */
|
|
fd = smh_trap(SYSOPEN, &open);
|
|
if (fd == -1)
|
|
return smh_errno();
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* struct smg_rdwr_s - Arguments for read and write
|
|
* @fd: A file descriptor returned from smh_open()
|
|
* @memp: Pointer to a buffer of memory of at least @len bytes
|
|
* @len: The number of bytes to read or write
|
|
*/
|
|
struct smh_rdwr_s {
|
|
long fd;
|
|
void *memp;
|
|
size_t len;
|
|
};
|
|
|
|
long smh_read(long fd, void *memp, size_t len)
|
|
{
|
|
long ret;
|
|
struct smh_rdwr_s read;
|
|
|
|
debug("%s: fd %ld, memp %p, len %zu\n", __func__, fd, memp, len);
|
|
|
|
read.fd = fd;
|
|
read.memp = memp;
|
|
read.len = len;
|
|
|
|
ret = smh_trap(SYSREAD, &read);
|
|
if (ret < 0)
|
|
return smh_errno();
|
|
return len - ret;
|
|
}
|
|
|
|
long smh_write(long fd, const void *memp, size_t len, ulong *written)
|
|
{
|
|
long ret;
|
|
struct smh_rdwr_s write;
|
|
|
|
debug("%s: fd %ld, memp %p, len %zu\n", __func__, fd, memp, len);
|
|
|
|
write.fd = fd;
|
|
write.memp = (void *)memp;
|
|
write.len = len;
|
|
|
|
ret = smh_trap(SYSWRITE, &write);
|
|
*written = len - ret;
|
|
if (ret)
|
|
return smh_errno();
|
|
return 0;
|
|
}
|
|
|
|
long smh_close(long fd)
|
|
{
|
|
long ret;
|
|
|
|
debug("%s: fd %ld\n", __func__, fd);
|
|
|
|
ret = smh_trap(SYSCLOSE, &fd);
|
|
if (ret == -1)
|
|
return smh_errno();
|
|
return 0;
|
|
}
|
|
|
|
long smh_flen(long fd)
|
|
{
|
|
long ret;
|
|
|
|
debug("%s: fd %ld\n", __func__, fd);
|
|
|
|
ret = smh_trap(SYSFLEN, &fd);
|
|
if (ret == -1)
|
|
return smh_errno();
|
|
return ret;
|
|
}
|
|
|
|
long smh_seek(long fd, long pos)
|
|
{
|
|
long ret;
|
|
struct smh_seek_s {
|
|
long fd;
|
|
long pos;
|
|
} seek;
|
|
|
|
debug("%s: fd %ld pos %ld\n", __func__, fd, pos);
|
|
|
|
seek.fd = fd;
|
|
seek.pos = pos;
|
|
|
|
ret = smh_trap(SYSSEEK, &seek);
|
|
if (ret)
|
|
return smh_errno();
|
|
return 0;
|
|
}
|
|
|
|
int smh_getc(void)
|
|
{
|
|
return smh_trap(SYSREADC, NULL);
|
|
}
|
|
|
|
void smh_putc(char ch)
|
|
{
|
|
smh_trap(SYSWRITEC, &ch);
|
|
}
|
|
|
|
void smh_puts(const char *s)
|
|
{
|
|
smh_trap(SYSWRITE0, (char *)s);
|
|
}
|