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@@ -0,0 +1,120 @@
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+/*
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+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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+ *
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+ * SPDX-License-Identifier: BSD-2-Clause
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+ */
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+
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+#include <AK/String.h>
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+#include <AK/StringUtils.h>
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+#include <LibCore/ArgsParser.h>
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+#include <LibCore/System.h>
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+#include <LibMain/Main.h>
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+#include <assert.h>
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+#include <errno.h>
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+#include <fcntl.h>
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+#include <inttypes.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <sys/mman.h>
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+#include <sys/stat.h>
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+#include <unistd.h>
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+
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+static bool try_set_offset_and_length_parameters(String const& arg_offset, String const& arg_length, u64& offset, u64& length)
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+{
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+ // TODO: Add support for hex values
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+ auto possible_offset = arg_offset.to_uint<u64>();
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+ if (!possible_offset.has_value())
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+ return false;
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+ auto possible_length = arg_length.to_uint<u64>();
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+ if (!possible_length.has_value())
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+ return false;
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+ offset = possible_offset.value();
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+ length = possible_length.value();
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+ return true;
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+}
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+
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+static void try_to_dump_with_memory_mapping(int fd, u64 offset, u64 length)
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+{
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+ VERIFY(fd >= 0);
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+ u64 mmoffset = offset % sysconf(_SC_PAGESIZE);
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+ void* mmp = mmap(NULL, mmoffset + length, PROT_READ, MAP_SHARED, fd, offset - mmoffset);
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+ if (mmp == MAP_FAILED) {
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+ perror("mmap");
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+ return;
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+ }
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+
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+ size_t ncomplete = 0;
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+ while (ncomplete < length) {
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+ ssize_t nwritten = write(STDOUT_FILENO, static_cast<u8*>(mmp) + ncomplete, length - ncomplete);
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+ if (nwritten < 0) {
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+ perror("write");
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+ return;
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+ }
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+ ncomplete += nwritten;
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+ }
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+ if (munmap(mmp, mmoffset + length) < 0) {
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+ perror("munmap");
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+ }
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+}
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+
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+static void try_to_dump_with_read(int fd, u64 offset, u64 length)
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+{
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+ VERIFY(fd >= 0);
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+ auto rs = lseek(fd, offset, SEEK_SET);
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+ if (rs < 0) {
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+ fprintf(stderr, "Couldn't seek to offset %" PRIi64 " while verifying: %s\n", offset, strerror(errno));
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+ return;
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+ }
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+ u8 buf[4096];
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+ size_t ncomplete = 0;
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+ while (ncomplete < length) {
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+ size_t length_to_be_read = min<size_t>((length - ncomplete), sizeof(buf));
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+ if (read(fd, buf, length_to_be_read) < 0) {
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+ perror("read");
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+ return;
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+ }
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+ ssize_t nwritten = write(STDOUT_FILENO, buf, length_to_be_read);
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+ if (nwritten < 0) {
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+ perror("write");
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+ return;
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+ }
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+ ncomplete += nwritten;
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+ }
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+}
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+
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+ErrorOr<int> serenity_main(Main::Arguments arguments)
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+{
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+ TRY(Core::System::pledge("stdio rpath"));
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+
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+ StringView arg_offset;
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+ StringView arg_length;
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+ bool use_read_instead_of_mmap = false;
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+ Core::ArgsParser args;
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+ args.add_positional_argument(arg_offset, "Physical Address (Offset)", "offset", Core::ArgsParser::Required::Yes);
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+ args.add_positional_argument(arg_length, "Length of that region", "length", Core::ArgsParser::Required::Yes);
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+ args.add_option(use_read_instead_of_mmap, "Read /dev/mem instead of try to map it", nullptr, 'r');
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+
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+ args.parse(arguments);
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+
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+ u64 offset = 0;
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+ u64 length = 0;
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+ if (!try_set_offset_and_length_parameters(arg_offset, arg_length, offset, length)) {
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+ warnln("pmemdump: Invalid length or offset parameters\n");
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+ return 1;
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+ }
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+
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+ int fd = open("/dev/mem", O_RDONLY);
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+ if (fd < 0) {
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+ perror("open");
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+ return 1;
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+ }
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+ if (use_read_instead_of_mmap)
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+ try_to_dump_with_read(fd, offset, length);
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+ else
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+ try_to_dump_with_memory_mapping(fd, offset, length);
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+
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+ close(fd);
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+
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+ return 0;
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+}
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