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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
*@brief Provides implementations of syscalls needed by libc. The newlib
* documentation provides a list of the required syscalls:
* https://sourceware.org/newlib/libc.html#Syscalls and minimal implementations
* can be found in newlib's "nosys" library:
* https://sourceware.org/git/?p=newlib-cygwin.git;a=tree;f=libgloss/libnosys.
*/
#include "gettimeofday.h"
#include "link_defs.h"
#include "panic.h"
#include "shared_mem.h"
#include "software_panic.h"
#include "system.h"
#include "task.h"
#include "uart.h"
#include <errno.h>
#include <sys/stat.h>
/**
* Reboot the system.
*
* This function is called from libc functions such as abort() or exit().
*
* @param rc exit code
*/
void _exit(int rc)
{
panic_printf("%s called with rc: %d\n", __func__, rc);
software_panic(PANIC_SW_EXIT, task_get_current());
}
/**
* Write to the UART.
*
* This function is called from libc functions such as printf().
*
* @param fd ignored
* @param buf buffer to write
* @param len number of bytes in @buf to write
* @return number of bytes successfully written
*/
int _write(int fd, char *buf, int len)
{
return uart_put(buf, len);
}
/**
* Create a directory.
*
* @warning Not implemented.
*
* @note Unlike the other functions in this file, this is not overriding a
* stub version in libnosys. There's no "_mkdir" stub in libnosys, so this
* provides the actual "mkdir" function.
*
* @param pathname directory to create
* @param mode mode for the new directory
* @return -1 (error) always
*/
int mkdir(const char *pathname, mode_t mode)
{
errno = ENOSYS;
return -1;
}
/**
* Get the time.
*
* This function is called from the libc gettimeofday() function.
*
* @warning This does not match gettimeofday() exactly; it does not return the
* time since the Unix Epoch.
*
* @param[out] tv time
* @param[in] tz ignored
* @return 0 on success
* @return -1 on error (errno is set to indicate error)
*/
int _gettimeofday(struct timeval *restrict tv, void *restrict tz)
{
enum ec_error_list ret = ec_gettimeofday(tv, tz);
if (ret == EC_ERROR_INVAL) {
errno = EFAULT;
return -1;
}
return 0;
}
/**
* Change program's data space by increment bytes.
*
* This function is called from the libc sbrk() function (which is in turn
* called from malloc() when memory needs to be allocated or released).
*
* @param incr[in] amount to increment or decrement. 0 means return current
* program break.
* @return the previous program break (address) on success
* @return (void*)-1 on error and errno is set to ENOMEM.
*/
void *_sbrk(intptr_t incr)
{
static char *heap_end = __shared_mem_buf;
char *prev_heap_end;
if ((heap_end + incr < __shared_mem_buf) ||
(heap_end + incr > (__shared_mem_buf + shared_mem_size()))) {
errno = ENOMEM;
return (void *)-1;
}
prev_heap_end = heap_end;
heap_end += incr;
return (void *)prev_heap_end;
}
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