58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
/*
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* \brief Linux-specific debug utilities
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* \author Norman Feske
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* \date 2009-05-16
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*/
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/*
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* Copyright (C) 2009-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/*
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* With the enabled 'DEBUG' flag, status information can be printed directly
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* via a Linux system call by using the 'raw_write_str' function. This output
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* bypasses the Genode 'LOG' mechanism, which is useful for debugging low-level
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* code such as a libC back-end.
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*/
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#define DEBUG 1
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#if DEBUG
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#include <linux_syscalls.h>
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#endif /* DEBUG */
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/**
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* Write function targeting directly the Linux system call layer and bypassing
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* any Genode code.
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*/
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extern "C" int raw_write_str(const char *str)
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{
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#if DEBUG
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unsigned len = 0;
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for (; str[len] != 0; len++);
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lx_syscall(SYS_write, (int)1, str, len);
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return len;
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#endif /* DEBUG */
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}
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/**
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* Debug function waiting until the user presses return
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*
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* This function is there to delay the execution of a back-end function such
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* that we have time to attack the GNU debugger to the running process. Once
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* attached, we can continue execution and use 'gdb' for debugging. In the
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* normal mode of operation, this function is never used.
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*/
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extern "C" void wait_for_continue(void)
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{
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#if DEBUG
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char buf[16];
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lx_syscall(SYS_read, (int)0, buf, sizeof(buf));
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#endif /* DEBUG */
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}
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