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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/LogStream.h>
#include <Kernel/Syscall.h>
#include <errno.h>
#include <sys/ptrace.h>
extern "C" {
int ptrace(int request, pid_t pid, void* addr, int data)
{
// PT_PEEK needs special handling since the syscall wrapper
// returns the peeked value as an int, which can be negative because of the cast.
// When using PT_PEEK, the user can check if an error occured
// by looking at errno rather than the return value.
u32 out_data;
Syscall::SC_ptrace_peek_params peek_params;
if (request == PT_PEEK) {
peek_params.address = reinterpret_cast<u32*>(addr);
peek_params.out_data = &out_data;
addr = &peek_params;
}
Syscall::SC_ptrace_params params {
request,
pid,
reinterpret_cast<u8*>(addr),
data
};
int rc = syscall(SC_ptrace, ¶ms);
if (request == PT_PEEK) {
if (rc < 0) {
errno = -rc;
return -1;
}
errno = 0;
return static_cast<int>(out_data);
}
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}
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