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/* SPDX-License-Identifier: GPL-2.0-or-later */
/***************************************************************************
* Copyright (C) 2018 by Liviu Ionescu *
* <ilg@livius.net> *
* *
* Copyright (C) 2009 by Marvell Technology Group Ltd. *
* Written by Nicolas Pitre <nico@marvell.com> *
***************************************************************************/
#ifndef OPENOCD_TARGET_SEMIHOSTING_COMMON_H
#define OPENOCD_TARGET_SEMIHOSTING_COMMON_H
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include "helper/replacements.h"
#include <server/server.h>
/*
* According to:
* "Semihosting for AArch32 and AArch64, Release 2.0"
* https://static.docs.arm.com/100863/0200/semihosting.pdf
* from ARM Ltd.
*
* The available semihosting operation numbers passed in R0 are allocated
* as follows:
* - 0x00-0x31 Used by ARM.
* - 0x32-0xFF Reserved for future use by ARM.
* - 0x100-0x1FF Reserved for user applications. These are not used by ARM.
* However, if you are writing your own SVC operations, you are advised
* to use a different SVC number rather than using the semihosted
* SVC number and these operation type numbers.
* - 0x200-0xFFFFFFFF Undefined and currently unused. It is recommended
* that you do not use these.
*/
enum semihosting_operation_numbers {
/*
* ARM semihosting operations, in lexicographic order.
*/
SEMIHOSTING_ENTER_SVC = 0x17, /* DEPRECATED */
SEMIHOSTING_SYS_CLOSE = 0x02,
SEMIHOSTING_SYS_CLOCK = 0x10,
SEMIHOSTING_SYS_ELAPSED = 0x30,
SEMIHOSTING_SYS_ERRNO = 0x13,
SEMIHOSTING_SYS_EXIT = 0x18,
SEMIHOSTING_SYS_EXIT_EXTENDED = 0x20,
SEMIHOSTING_SYS_FLEN = 0x0C,
SEMIHOSTING_SYS_GET_CMDLINE = 0x15,
SEMIHOSTING_SYS_HEAPINFO = 0x16,
SEMIHOSTING_SYS_ISERROR = 0x08,
SEMIHOSTING_SYS_ISTTY = 0x09,
SEMIHOSTING_SYS_OPEN = 0x01,
SEMIHOSTING_SYS_READ = 0x06,
SEMIHOSTING_SYS_READC = 0x07,
SEMIHOSTING_SYS_REMOVE = 0x0E,
SEMIHOSTING_SYS_RENAME = 0x0F,
SEMIHOSTING_SYS_SEEK = 0x0A,
SEMIHOSTING_SYS_SYSTEM = 0x12,
SEMIHOSTING_SYS_TICKFREQ = 0x31,
SEMIHOSTING_SYS_TIME = 0x11,
SEMIHOSTING_SYS_TMPNAM = 0x0D,
SEMIHOSTING_SYS_WRITE = 0x05,
SEMIHOSTING_SYS_WRITEC = 0x03,
SEMIHOSTING_SYS_WRITE0 = 0x04,
SEMIHOSTING_ARM_RESERVED_START = 0x32,
SEMIHOSTING_ARM_RESERVED_END = 0xFF,
SEMIHOSTING_USER_CMD_0X100 = 0x100, /* First user cmd op code */
SEMIHOSTING_USER_CMD_0X107 = 0x107, /* Last supported user cmd op code */
SEMIHOSTING_USER_CMD_0X1FF = 0x1FF, /* Last user cmd op code */
};
/** Maximum allowed Tcl command segment length in bytes*/
#define SEMIHOSTING_MAX_TCL_COMMAND_FIELD_LENGTH (1024 * 1024)
/*
* Codes used by SEMIHOSTING_SYS_EXIT (formerly
* SEMIHOSTING_REPORT_EXCEPTION).
* On 64-bits, the exit code is passed explicitly.
*/
enum semihosting_reported_exceptions {
/* On 32 bits, use it for exit(0) */
ADP_STOPPED_APPLICATION_EXIT = ((2 << 16) + 38),
/* On 32 bits, use it for exit(1) */
ADP_STOPPED_RUN_TIME_ERROR = ((2 << 16) + 35),
};
enum semihosting_redirect_config {
SEMIHOSTING_REDIRECT_CFG_NONE,
SEMIHOSTING_REDIRECT_CFG_DEBUG,
SEMIHOSTING_REDIRECT_CFG_STDIO,
SEMIHOSTING_REDIRECT_CFG_ALL,
};
enum semihosting_result {
SEMIHOSTING_NONE, /* Not halted for a semihosting call. */
SEMIHOSTING_HANDLED, /* Call handled, and target was resumed. */
SEMIHOSTING_WAITING, /* Call handled, target is halted waiting until we can resume. */
SEMIHOSTING_ERROR /* Something went wrong. */
};
struct target;
/*
* A pointer to this structure was added to the target structure.
*/
struct semihosting {
/** A flag reporting whether semihosting is active. */
bool is_active;
/** Semihosting STDIO file descriptors */
int stdin_fd, stdout_fd, stderr_fd;
/** redirection configuration, NONE by default */
enum semihosting_redirect_config redirect_cfg;
/** Handle to redirect semihosting print via tcp */
struct connection *tcp_connection;
/** A flag reporting whether semihosting fileio is active. */
bool is_fileio;
/** A flag reporting whether semihosting fileio operation is active. */
bool hit_fileio;
/** Most are resumable, except the two exit calls. */
bool is_resumable;
/**
* When SEMIHOSTING_SYS_EXIT is called outside a debug session,
* things are simple, the openocd process calls exit() and passes
* the value returned by the target.
* When SEMIHOSTING_SYS_EXIT is called during a debug session,
* by default execution returns to the debugger, leaving the
* debugger in a HALT state, similar to the state entered when
* encountering a break.
* In some use cases, it is useful to have SEMIHOSTING_SYS_EXIT
* return normally, as any semihosting call, and do not break
* to the debugger.
* The standard allows this to happen, but the condition
* to trigger it is a bit obscure ("by performing an RDI_Execute
* request or equivalent").
*
* To make the SEMIHOSTING_SYS_EXIT call return normally, enable
* this variable via the dedicated command (default: disabled).
*/
bool has_resumable_exit;
/** The Target (hart) word size; 8 for 64-bits targets. */
size_t word_size_bytes;
/** The current semihosting operation (R0 on ARM). */
int op;
/** The current semihosting parameter (R1 or ARM). */
uint64_t param;
/**
* The current semihosting result to be returned to the application.
* Usually 0 for success, -1 for error,
* but sometimes a useful value, even a pointer.
*/
int64_t result;
/** The value to be returned by semihosting SYS_ERRNO request. */
int sys_errno;
/** The semihosting command line to be passed to the target. */
char *cmdline;
/** The current time when 'execution starts' */
clock_t setup_time;
/** Base directory for semihosting I/O operations. */
char *basedir;
/**
* Target's extension of semihosting user commands.
* @returns ERROR_NOT_IMPLEMENTED when user command is not handled, otherwise
* sets semihosting->result and semihosting->sys_errno and returns ERROR_OK.
*/
int (*user_command_extension)(struct target *target);
int (*setup)(struct target *target, int enable);
int (*post_result)(struct target *target);
};
/**
* @brief Convert the syscall opcode to a human-readable string
* @param[in] opcode Syscall opcode
* @return String representation of syscall opcode
*/
const char *semihosting_opcode_to_str(uint64_t opcode);
int semihosting_common_init(struct target *target, void *setup,
void *post_result);
int semihosting_common(struct target *target);
/* utility functions which may also be used by semihosting extensions (custom vendor-defined syscalls) */
int semihosting_read_fields(struct target *target, size_t number,
uint8_t *fields);
int semihosting_write_fields(struct target *target, size_t number,
uint8_t *fields);
uint64_t semihosting_get_field(struct target *target, size_t index,
uint8_t *fields);
void semihosting_set_field(struct target *target, uint64_t value,
size_t index,
uint8_t *fields);
extern const struct command_registration semihosting_common_handlers[];
#endif /* OPENOCD_TARGET_SEMIHOSTING_COMMON_H */
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