/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <string.h>
#include <sys/errno.h>
#ifdef __XTENSA__
#include "xtensa/semihosting.h"
#elif __riscv
#include "riscv/semihosting.h"
#else
#error Unsupported architecture
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* Semihosting call numbers and functions for OpenOCD.
* In OpenOCD, ARM semihosting call numbers and parameters are used for
* RISC-V and Xtensa targets.
*
* These conventions are not compatible with Xtensa ISS and QEMU for Xtensa,
* which the actual Xtensa-specific semihosting call numbers and formats;
* these are not supported in ESP-IDF yet.
*/
#define SEMIHOSTING_SYS_CLOCK 0x10
#define SEMIHOSTING_SYS_CLOSE 0x02
#define SEMIHOSTING_SYS_ERRNO 0x13
#define SEMIHOSTING_SYS_EXIT 0x18
#define SEMIHOSTING_SYS_EXIT_EXTENDED 0x20
#define SEMIHOSTING_SYS_FLEN 0x0C
#define SEMIHOSTING_SYS_GET_CMDLINE 0x15
#define SEMIHOSTING_SYS_HEAPINFO 0x16
#define SEMIHOSTING_SYS_ISERROR 0x08
#define SEMIHOSTING_SYS_ISTTY 0x09
#define SEMIHOSTING_SYS_OPEN 0x01
#define SEMIHOSTING_SYS_READ 0x06
#define SEMIHOSTING_SYS_READC 0x07
#define SEMIHOSTING_SYS_REMOVE 0x0E
#define SEMIHOSTING_SYS_RENAME 0x0F
#define SEMIHOSTING_SYS_SEEK 0x0A
#define SEMIHOSTING_SYS_SYSTEM 0x12
#define SEMIHOSTING_SYS_TIME 0x11
#define SEMIHOSTING_SYS_WRITE 0x05
#define SEMIHOSTING_SYS_WRITEC 0x03
#define SEMIHOSTING_SYS_WRITE0 0x04
/* This call is an Espressif OpenOCD extension to send the version
* information to the host. This lets the host support different IDF versions,
* allowing semihosting interface to be modified over time.
*
* The parameters of this call are:
* - pointer to the version info structure,
* - size of the version info structure.
*
* At present, the structure should contain a single word, indicating
* the semihosting interface version used by the target.
*
* If the syscall is recognized, the return value is zero.
*/
#define ESP_SEMIHOSTING_SYS_DRV_INFO 0x100
/* 0x101...0x104 used by RiscV for custom semihosting calls */
/* Other Espressif extension sys calls */
#define ESP_SEMIHOSTING_SYS_SEEK 0x105 /* custom lseek with whence */
/* not implemented yet */
#define ESP_SEMIHOSTING_SYS_MKDIR 0x106
#define ESP_SEMIHOSTING_SYS_OPENDIR 0x107
#define ESP_SEMIHOSTING_SYS_READDIR 0x108
#define ESP_SEMIHOSTING_SYS_READDIR_R 0x109
#define ESP_SEMIHOSTING_SYS_SEEKDIR 0x10A
#define ESP_SEMIHOSTING_SYS_TELLDIR 0x10B
#define ESP_SEMIHOSTING_SYS_CLOSEDIR 0x10C
#define ESP_SEMIHOSTING_SYS_RMDIR 0x10D
#define ESP_SEMIHOSTING_SYS_ACCESS 0x10E
#define ESP_SEMIHOSTING_SYS_TRUNCATE 0x10F
#define ESP_SEMIHOSTING_SYS_UTIME 0x110
#define ESP_SEMIHOSTING_SYS_FSTAT 0x111
#define ESP_SEMIHOSTING_SYS_STAT 0x112
#define ESP_SEMIHOSTING_SYS_FSYNC 0x113
#define ESP_SEMIHOSTING_SYS_LINK 0x114
#define ESP_SEMIHOSTING_SYS_UNLINK 0x115
/* Semihosting version bumped to 2. Changelog;
1 - Memory based approach with 2 registers implemented as defined in the ARM standard.
2 - User defined syscall numbers located between 0x100-0x1FF
3 - The break instruction operands updated to (1, 14)
4 - Absolute path support is dropped
*/
#define SEMIHOSTING_DRV_VERSION 2
/**
* @brief Perform semihosting call and retrieve errno
*
* @param id semihosting call number
* @param data data block to pass to the host; number of items and their
* meaning depends on the semihosting call. See the spec for
* details.
* @param[out] out_errno output, errno value from the host. Only set if
* the return value is negative.
* @return return value from the host
*/
static inline long semihosting_call(long id, long *data, int *out_errno)
{
long ret = semihosting_call_noerrno(id, data);
if (ret < 0) {
const int semihosting_sys_errno = SEMIHOSTING_SYS_ERRNO;
*out_errno = (int) semihosting_call_noerrno(semihosting_sys_errno, NULL);
}
return ret;
}
static inline int semihosting_open(const char *path, int open_mode, int mode)
{
int host_errno = 0;
long args[] = {(long) path, open_mode, strlen(path), 0};
(void) mode; // unused in OpenOCD
int result = (int) semihosting_call(SEMIHOSTING_SYS_OPEN, args, &host_errno);
if (result < 0) {
errno = host_errno;
}
return result;
}
static inline ssize_t semihosting_write(int fd, const void *data, size_t size)
{
int host_errno = 0;
long args[] = {fd, (long) data, size, 0};
ssize_t ret = (ssize_t) semihosting_call(SEMIHOSTING_SYS_WRITE, args, &host_errno);
if (ret < 0) {
errno = host_errno;
return ret;
}
/* On success, write syscall returns the number of bytes NOT written,
* adjust the return value to match POSIX.
*/
return size - (ssize_t)ret;
}
static inline ssize_t semihosting_read(int fd, void *data, size_t size)
{
int host_errno = 0;
long args[] = {fd, (long) data, size, 0};
ssize_t ret = (ssize_t) semihosting_call(SEMIHOSTING_SYS_READ, args, &host_errno);
if (ret < 0) {
errno = host_errno;
return ret;
}
/* On success, read syscall returns the number of bytes NOT read,
* adjust the return value to match POSIX.
*/
return size - (ssize_t)ret;
}
static inline int semihosting_close(int fd)
{
int host_errno = 0;
long args[] = {fd, 0, 0, 0};
int ret = (int) semihosting_call(SEMIHOSTING_SYS_CLOSE, args, &host_errno);
if (ret < 0) {
errno = host_errno;
}
return ret;
}
static inline off_t semihosting_seek(int fd, off_t offset, int mode)
{
int host_errno = 0;
long args[] = {fd, offset, mode, 0};
off_t ret = (off_t) semihosting_call(ESP_SEMIHOSTING_SYS_SEEK, args, &host_errno);
if (ret == -1) {
errno = host_errno;
}
return ret;
}
static inline int semihosting_ver_info(void)
{
int host_errno = 0;
struct {
int version;
} ver_info = { SEMIHOSTING_DRV_VERSION };
long args[] = {(long) &ver_info, sizeof(ver_info), 0, 0};
int ret = (int) semihosting_call(ESP_SEMIHOSTING_SYS_DRV_INFO, args, &host_errno);
(void) host_errno; /* errno not set by this call */
return ret;
}
#ifdef __cplusplus
}
#endif