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/*
* Hosted file support for semihosting syscalls.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Copyright © 2020 by Keith Packard <keithp@keithp.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef SEMIHOSTING_GUESTFD_H
#define SEMIHOSTING_GUESTFD_H
typedef enum GuestFDType {
GuestFDUnused = 0,
GuestFDHost,
GuestFDGDB,
GuestFDStatic,
GuestFDConsole,
} GuestFDType;
/*
* Guest file descriptors are integer indexes into an array of
* these structures (we will dynamically resize as necessary).
*/
typedef struct GuestFD {
GuestFDType type;
union {
int hostfd;
struct {
const uint8_t *data;
size_t len;
size_t off;
} staticfile;
};
} GuestFD;
/*
* For ARM semihosting, we have a separate structure for routing
* data for the console which is outside the guest fd address space.
*/
extern GuestFD console_in_gf;
extern GuestFD console_out_gf;
/**
* alloc_guestfd:
*
* Allocate an unused GuestFD index. The associated guestfd index
* will still be GuestFDUnused until it is initialized.
*/
int alloc_guestfd(void);
/**
* dealloc_guestfd:
* @guestfd: GuestFD index
*
* Deallocate a GuestFD index. The associated GuestFD structure
* will be recycled for a subsequent allocation.
*/
void dealloc_guestfd(int guestfd);
/**
* get_guestfd:
* @guestfd: GuestFD index
*
* Return the GuestFD structure associated with an initialized @guestfd,
* or NULL if it has not been allocated, or hasn't been initialized.
*/
GuestFD *get_guestfd(int guestfd);
/**
* associate_guestfd:
* @guestfd: GuestFD index
* @hostfd: host file descriptor
*
* Initialize the GuestFD for @guestfd to GuestFDHost using @hostfd.
*/
void associate_guestfd(int guestfd, int hostfd);
/**
* staticfile_guestfd:
* @guestfd: GuestFD index
* @data: data to be read
* @len: length of @data
*
* Initialize the GuestFD for @guestfd to GuestFDStatic.
* The @len bytes at @data will be returned to the guest on reads.
*/
void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len);
#endif /* SEMIHOSTING_GUESTFD_H */
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