86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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// This is the pathname to the sysfs file that enables and disables
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// tracing on the qemu emulator.
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#define SYS_QEMU_TRACE_STATE "/sys/qemu_trace/state"
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// This is the pathname to the sysfs file that adds new (address, symbol)
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// pairs to the trace.
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#define SYS_QEMU_TRACE_SYMBOL "/sys/qemu_trace/symbol"
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// The maximum length of a symbol name
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#define MAX_SYMBOL_NAME_LENGTH (4 * 1024)
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// Allow space in the buffer for the address plus whitespace.
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#define MAX_BUF_SIZE (MAX_SYMBOL_NAME_LENGTH + 20)
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// return 0 on success, or an error if the qemu driver cannot be opened
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int qemu_start_tracing()
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{
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int fd = open(SYS_QEMU_TRACE_STATE, O_WRONLY);
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if (fd < 0)
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return fd;
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write(fd, "1\n", 2);
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close(fd);
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return 0;
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}
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int qemu_stop_tracing()
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{
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int fd = open(SYS_QEMU_TRACE_STATE, O_WRONLY);
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if (fd < 0)
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return fd;
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write(fd, "0\n", 2);
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close(fd);
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return 0;
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}
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int qemu_add_mapping(unsigned int addr, const char *name)
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{
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char buf[MAX_BUF_SIZE];
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if (strlen(name) > MAX_SYMBOL_NAME_LENGTH)
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return EINVAL;
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int fd = open(SYS_QEMU_TRACE_SYMBOL, O_WRONLY);
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if (fd < 0)
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return fd;
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sprintf(buf, "%x %s\n", addr, name);
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write(fd, buf, strlen(buf));
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close(fd);
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return 0;
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}
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int qemu_remove_mapping(unsigned int addr)
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{
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char buf[MAX_BUF_SIZE];
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int fd = open(SYS_QEMU_TRACE_SYMBOL, O_WRONLY);
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if (fd < 0)
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return fd;
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sprintf(buf, "%x\n", addr);
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write(fd, buf, strlen(buf));
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close(fd);
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return 0;
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}
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