@micro-os-plus/semihosting

v8.0.0

Published

2 years ago

A source library xPack with the µOS++ portable semihosting definitions

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A source library xPack with the µOS++ semihosting support

This project provides the XXXX YYYY source library as an xPack dependency and includes support for semihosting.

It complements the newlib implementation (arm/librdimon) with a more complete set of POSIX functions, and also includes debugging support.

The project is hosted on GitHub as micro-os-plus/semihosting-xpack.

Maintainer info

This page is addressed to developers who plan to include this source library into their own projects.

For maintainer info, please see the README-MAINTAINER file.

Install

As a source library xPack, the easiest way to add it to a project is via xpm, but it can also be used as any Git project, for example as a submodule.

Prerequisites

A recent xpm, which is a portable Node.js command line application.

For details please follow the instructions in the xPack install page.

xpm

Note: the package will be available from npmjs.com at a later date.

For now, it can be installed from GitHub:

cd my-project
xpm init # Unless a package.json is already present

xpm install github:micro-os-plus/semihosting-xpack

When ready, this package will be available as @micro-os-plus/semihosting from the npmjs.com registry:

cd my-project
xpm init # Unless a package.json is already present

xpm install @micro-os-plus/semihosting@latest

ls -l xpacks/micro-os-plus-semihosting

Git submodule

If, for any reason, xpm is not available, the next recommended solution is to link it as a Git submodule below an xpacks folder.

cd my-project
git init # Unless already a Git project
mkdir -p xpacks

git submodule add https://github.com/micro-os-plus/semihosting-xpack.git \
  xpacks/micro-os-plus-semihosting

Branches

Apart from the unused master branch, there are two active branches:

xpack, with the latest stable version (default)
xpack-develop, with the current development version

All development is done in the xpack-develop branch, and contributions via Pull Requests should be directed to this branch.

When new releases are published, the xpack-develop branch is merged into xpack.

Developer info

Overview

This project provides several components, which can be enabled separately:

the declarations for the basic semihosting calls
implementations for the system calls
implementations for the initialisations required during the startup
implementations for the debug trace channels via semihosting

Status

The semihosting source library is fully functional.

C++ API

The C++ methods available to call semihosting functions are:

namespace micro_os_plus::semihosting
{
  response_t
  call_host (int reason, param_block_t* arg);
}

C API

The same functionality is available from a similar C function, defined in the architecture package:

static micro_os_plus_semihosting_response_t
micro_os_plus_semihosting_call_host (
    int reason,
    micro_os_plus_semihosting_param_block_t* arg);

Implementation

The architecture should provide a definition of the following function:

  static inline __attribute__ ((always_inline)) int
  micro_os_plus_semihosting_call_host (int reason, void* arg);

Build & integration info

The project is written in C++, and it is expected to be used in C and C++ projects.

The source code was compiled with GCC 11, clang 12, clang 13 arm-none-eabi-gcc 11, riscv-none-elf-gcc 12, and should be warning free.

To ease the integration of this package into user projects, there are already made CMake and meson configuration files (see below).

For other build systems, consider the following details:

Include folders

The following folders should be passed to the compiler during the build:

include

The header files to be included in user projects are:

#include <micro-os-plus/semihosting.h>

Source files

The source files to be added to the build are:

src/semihosting-startup.cpp
src/semihosting-syscalls.cpp
src/semihosting-trace.cpp

Preprocessor definitions

MICRO_OS_PLUS_INCLUDE_CONFIG_H - to include <micro-os-plus/config.h>
MICRO_OS_PLUS_INCLUDE_SEMIHOSTING_SYSCALLS
MICRO_OS_PLUS_INTEGER_SEMIHOSTING_MAX_OPEN_FILES (20)
MICRO_OS_PLUS_DEBUG_SYSCALLS_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_CHDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_CHMOD_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_CHOWN_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_CLOSEDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_EXECVE_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_FCNTL_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_FORK_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_FSYNC_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_FTRUNCATE_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_IOCTL_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_KILL_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_LINK_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_OPENDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_RAISE_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_READDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_READLINK_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_REWINDDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_RMDIR_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_SELECT_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_SYMLINK_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_SYNC_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_TRUNCATE_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_UTIME_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_WAIT_BRK
MICRO_OS_PLUS_DEBUG_SYSCALL_WRITEV_BRK
MICRO_OS_PLUS_INCLUDE_SEMIHOSTING_STARTUP
MICRO_OS_PLUS_INTEGER_SEMIHOSTING_CMDLINE_ARRAY_SIZE (80)
MICRO_OS_PLUS_INTEGER_SEMIHOSTING_ARGV_ARRAY_SIZE (10)

Compiler options

-std=c++20 or higher for C++ sources
-std=c11 for C sources

C++ Namespaces

micro_os_plus::semihosting

C++ Classes

none

Dependencies

the @micro-os-plus/diag-trace package, for the declarations of the debug trace channels

CMake

To integrate the semihosting source library into a CMake application, add this folder to the build:

add_subdirectory("xpacks/micro-os-plus-semihosting")`

The result is an interface library that can be added as an application dependency with:

target_link_libraries(your-target PRIVATE

  micro-os-plus::semihosting
)

meson

To integrate the semihosting source library into a meson application, add this folder to the build:

subdir('xpacks/micro-os-plus-semihosting')

The result is a dependency object that can be added to an application with:

exe = executable(
  your-target,
  link_with: [
    # Nothing, not static.
  ],
  dependencies: [
    micro_os_plus_semihosting_dependency,
  ]
)

Examples

TBD

Known problems

none

Tests

TBD

Change log - incompatible changes

According to semver rules:

Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API.

The incompatible changes, in reverse chronological order, are:

v7.x: get rid of the C++ posix:: namespace
v6.x: rename source files
v5.x: rename SYS_GETCMDLINE; use param_block_t
v4.x: rename MICRO_OS_PLUS_DEBUG, MICRO_OS_PLUS_TRACE
v3.x: rename the micro_os_plus namespace
v2.x: update for new OpenOCD implementation; use the posix:: namespace
v1.x: the code was extracted from the mono-repo µOS++ project