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Supplement base/log.h with raw output function

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This patch introduces the Genode::raw function that prints output
directly via a low-level kernel mechanism, if available.

On base-linux, it replaces the former 'raw_write_str' function.
On base-hw, it replaces the former kernel/log.h interface.

Fixes #2012
This commit is contained in:
Norman Feske
2016-06-16 15:55:36 +02:00
committed by Christian Helmuth
parent ebdb1c6892
commit 2030ae678e
27 changed files with 351 additions and 217 deletions
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29
repos/base-linux/src/lib/base/debug.cc
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@ -11,34 +11,7 @@
* under the terms of the GNU General Public License version 2.
*/
/*
* With the enabled 'DEBUG' flag, status information can be printed directly
* via a Linux system call by using the 'raw_write_str' function. This output
* bypasses the Genode 'LOG' mechanism, which is useful for debugging low-level
* code such as a libC back-end.
*/
#define DEBUG 1
#if DEBUG
#include <linux_syscalls.h>
#endif /* DEBUG */
/**
* Write function targeting directly the Linux system call layer and bypassing
* any Genode code.
*/
extern "C" int raw_write_str(const char *str)
{
#if DEBUG
unsigned len = 0;
for (; str[len] != 0; len++);
lx_syscall(SYS_write, (int)1, str, len);
return len;
#endif /* DEBUG */
}
/**
* Debug function waiting until the user presses return
@ -50,8 +23,6 @@ extern "C" int raw_write_str(const char *str)
*/
extern "C" void wait_for_continue(void)
{
#if DEBUG
char buf[16];
lx_syscall(SYS_read, (int)0, buf, sizeof(buf));
#endif /* DEBUG */
}