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/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Philippe Proulx <pproulx@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include <stdio.h>
#include <barectf.h>
#include "barectf-platform-qemu-arm-uart.h"
#define BUF_SIZE 4096
#define TIMER_CTRL_32BIT (1 << 1)
#define TIMER_CTRL_ENABLE (1 << 7)
volatile uint32_t * const uart0 = (uint32_t *) 0x101f1000;
volatile uint32_t * const uart1 = (uint32_t *) 0x101f2000;
volatile uint32_t * const timer0_ctrl = (uint32_t *) 0x101e2008;
volatile uint32_t * const timer0_value = (uint32_t *) 0x101e2004;
static struct barectf_default_ctx barectf_ctx;
static uint8_t buf[BUF_SIZE];
static uint64_t get_clock(void* data)
{
return (uint64_t) -*timer0_value;
}
static void flush_packet(void)
{
size_t i;
/* flush packet to UART 1 */
for (i = 0; i < BUF_SIZE; ++i) {
*uart1 = (uint32_t) buf[i];
}
}
static int is_backend_full(void *data)
{
return 0;
}
static void open_packet(void *data)
{
barectf_default_open_packet(&barectf_ctx);
}
static void close_packet(void *data)
{
/* close packet now */
barectf_default_close_packet(&barectf_ctx);
/* flush current packet */
flush_packet();
}
void barectf_platform_qemu_arm_uart_init(void)
{
struct barectf_platform_callbacks cbs = {
.default_clock_get_value = get_clock,
.is_backend_full = is_backend_full,
.open_packet = open_packet,
.close_packet = close_packet,
};
/* enable/start timer (clock source) */
*timer0_ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE;
/* initialize barectf context */
barectf_init(&barectf_ctx, buf, BUF_SIZE, cbs, NULL);
/* open first packet */
open_packet(NULL);
/* indicate that tracing is starting */
puts("tracing: starting");
}
void barectf_platform_qemu_arm_uart_fini(void)
{
/* close last packet if it contains at least one event */
if (barectf_packet_is_open(&barectf_ctx) &&
!barectf_packet_is_empty(&barectf_ctx)) {
close_packet(NULL);
}
/* indicate that tracing is done */
puts("tracing: done");
}
struct barectf_default_ctx *barectf_platform_qemu_arm_uart_get_barectf_ctx()
{
return &barectf_ctx;
}
#define STDOUT 1
#define STDERR 2
/* custom write "syscall" for newlib's stdio: write to UART 0 */
int _write(int file, char *ptr, int len) {
if (file == STDOUT || file == STDERR) {
int i;
for (i = 0; i < len; i++) {
*uart0 = (uint32_t) ptr[i];
}
}
return 0;
}
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