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38ddf301f6
This makes the types used in the PT_PEEK and PT_POKE actions suitable for 64-bit platforms as well.
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <errno.h>
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#include <sys/ptrace.h>
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#include <syscall.h>
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extern "C" {
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long ptrace(int request, pid_t tid, void* addr, void* data)
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{
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// PT_PEEK needs special handling since the syscall wrapper
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// returns the peeked value as an int, which can be negative because of the cast.
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// When using PT_PEEK, the user can check if an error occurred
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// by looking at errno rather than the return value.
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FlatPtr out_data;
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Syscall::SC_ptrace_peek_params peek_params;
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auto is_peek_type = request == PT_PEEK || request == PT_PEEKDEBUG;
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if (is_peek_type) {
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peek_params.address = reinterpret_cast<FlatPtr*>(addr);
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peek_params.out_data = &out_data;
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addr = &peek_params;
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}
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Syscall::SC_ptrace_params params {
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request,
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tid,
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addr,
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(FlatPtr)data
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};
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long rc = syscall(SC_ptrace, ¶ms);
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if (is_peek_type) {
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if (rc < 0) {
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errno = -rc;
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return -1;
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}
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errno = 0;
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return static_cast<long>(out_data);
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}
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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