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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>
161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
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*/
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#ifndef _SEMIHOSTING_H
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#define _SEMIHOSTING_H
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/*
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* These are the encoded instructions used to indicate a semihosting trap. They
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* are named like SMH_ISA_INSN, where ISA is the instruction set (e.g.
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* AArch64), and INSN is the mneumonic for the instruction.
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*/
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#define SMH_A64_HLT 0xD45E0000
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#define SMH_A32_SVC 0xEF123456
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#define SMH_A32_HLT 0xE10F0070
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#define SMH_T32_SVC 0xDFAB
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#define SMH_T32_HLT 0xBABC
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/**
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* smh_trap() - ARCH-specific semihosting call.
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*
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* Semihosting library/driver can use this function to do the
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* actual semihosting calls.
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*
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* Return: Error code defined by semihosting spec.
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*/
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long smh_trap(unsigned int sysnum, void *addr);
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#if CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK)
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/**
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* semihosting_enabled() - Determine whether semihosting is supported
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*
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* Semihosting-based drivers should call this function before making other
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* semihosting calls.
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*
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* Return: %true if a debugger is attached which supports semihosting, %false
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* otherwise
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*/
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bool semihosting_enabled(void);
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/**
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* disable_semihosting() - Cause semihosting_enabled() to return false
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*
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* If U-Boot ever receives an unhandled exception caused by a semihosting trap,
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* the trap handler should call this function.
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*/
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void disable_semihosting(void);
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#else
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static inline bool semihosting_enabled(void)
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{
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return CONFIG_IS_ENABLED(SEMIHOSTING);
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}
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static inline void disable_semihosting(void)
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{
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}
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#endif
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/**
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* enum smh_open_mode - Numeric file modes for use with smh_open()
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* MODE_READ: 'r'
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* MODE_BINARY: 'b'
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* MODE_PLUS: '+'
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* MODE_WRITE: 'w'
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* MODE_APPEND: 'a'
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*
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* These modes represent the mode string used by fopen(3) in a form which can
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* be passed to smh_open(). These do NOT correspond directly to %O_RDONLY,
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* %O_CREAT, etc; see fopen(3) for details. In particular, @MODE_PLUS
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* effectively results in adding %O_RDWR, and @MODE_WRITE will add %O_TRUNC.
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* For compatibility, @MODE_BINARY should be added when opening non-text files
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* (such as images).
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*/
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enum smh_open_mode {
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MODE_READ = 0x0,
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MODE_BINARY = 0x1,
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MODE_PLUS = 0x2,
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MODE_WRITE = 0x4,
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MODE_APPEND = 0x8,
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};
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/**
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* smh_open() - Open a file on the host
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* @fname: The name of the file to open
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* @mode: The mode to use when opening the file
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*
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* Return: Either a file descriptor or a negative error on failure
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*/
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long smh_open(const char *fname, enum smh_open_mode mode);
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/**
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* smh_read() - Read data from a file
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* @fd: A file descriptor returned from smh_open()
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* @memp: Pointer to a buffer of memory of at least @len bytes
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* @len: The number of bytes to read
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*
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* Return:
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* * The number of bytes read on success, with 0 indicating %EOF
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* * A negative error on failure
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*/
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long smh_read(long fd, void *memp, size_t len);
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/**
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* smh_write() - Write data to a file
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* @fd: A file descriptor returned from smh_open()
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* @memp: Pointer to a buffer of memory of at least @len bytes
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* @len: The number of bytes to read
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* @written: Pointer which will be updated with the actual bytes written
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*
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* Return: 0 on success or negative error on failure
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*/
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long smh_write(long fd, const void *memp, size_t len, ulong *written);
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/**
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* smh_close() - Close an open file
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* @fd: A file descriptor returned from smh_open()
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*
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* Return: 0 on success or negative error on failure
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*/
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long smh_close(long fd);
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/**
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* smh_flen() - Get the length of a file
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* @fd: A file descriptor returned from smh_open()
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*
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* Return: The length of the file, in bytes, or a negative error on failure
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*/
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long smh_flen(long fd);
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/**
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* smh_seek() - Seek to a position in a file
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* @fd: A file descriptor returned from smh_open()
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* @pos: The offset (in bytes) to seek to
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*
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* Return: 0 on success or negative error on failure
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*/
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long smh_seek(long fd, long pos);
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/**
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* smh_getc() - Read a character from stdin
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*
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* Return: The character read, or a negative error on failure
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*/
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int smh_getc(void);
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/**
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* smh_putc() - Print a character on stdout
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* @ch: The character to print
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*/
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void smh_putc(char ch);
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/**
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* smh_write0() - Print a nul-terminated string on stdout
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* @s: The string to print
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*/
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void smh_puts(const char *s);
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#endif /* _SEMIHOSTING_H */
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