core.actions: Fixed indexerror in move_parent() - ranger - mirror of ranger

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author	hut <hut@lavabit.com>	2010-06-20 17:12:32 +0200
committer	hut <hut@lavabit.com>	2010-06-20 17:12:32 +0200
commit	1dbb5ce9e0dfe2b857020290b29e2e22321985ef (patch)
tree	faa8f16d25ec05db51d9c782d4dab6ab0dfa5a17 /doc/pydoc/ranger.fsobject.fsobject.html
parent	c928a9ebd2dc11142f5a7d5b1e6be5cff0183e96 (diff)
download	ranger-1dbb5ce9e0dfe2b857020290b29e2e22321985ef.tar.gz

core.actions: Fixed indexerror in move_parent()

Diffstat (limited to 'doc/pydoc/ranger.fsobject.fsobject.html')

0 files changed, 0 insertions, 0 deletions

// Helper for debugging and testing. // Based on https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c :(before "End Main") assert(argc > 1); if (is_equal(argv[1], "run")) { START_TRACING_UNTIL_END_OF_SCOPE; assert(argc > 2); reset(); cerr << std::hex; initialize_mem(); Mem_offset = CODE_START; load_elf(argv[2]); while (EIP < End_of_program) // weak final-gasp termination check run_one_instruction(); info << "executed past end of the world: " << EIP << " vs " << End_of_program << '\n'; } :(code) void load_elf(const string& filename) { int fd = open(filename.c_str(), O_RDONLY); if (fd < 0) raise << filename.c_str() << ": open" << perr() << '\n' << die(); off_t size = lseek(fd, 0, SEEK_END); lseek(fd, 0, SEEK_SET); uint8_t* elf_contents = static_cast<uint8_t*>(malloc(size)); if (elf_contents == NULL) raise << "malloc(" << size << ')' << perr() << '\n' << die(); ssize_t read_size = read(fd, elf_contents, size); if (size != read_size) raise << "read → " << size << " (!= " << read_size << ')' << perr() << '\n' << die(); load_elf_contents(elf_contents, size); free(elf_contents); } void load_elf_contents(uint8_t* elf_contents, size_t size) { uint8_t magic[5] = {0}; memcpy(magic, elf_contents, 4); if (memcmp(magic, "\177ELF", 4) != 0) raise << "Invalid ELF file; starts with \"" << magic << '"' << die(); if (elf_contents[4] != 1) raise << "Only 32-bit ELF files (4-byte words; virtual addresses up to 4GB) supported.\n" << die(); if (elf_contents[5] != 1) raise << "Only little-endian ELF files supported.\n" << die(); // unused: remaining 10 bytes of e_ident uint32_t e_machine_type = u32_in(&elf_contents[16]); if (e_machine_type != 0x00030002) raise << "ELF type/machine 0x" << HEXWORD << e_machine_type << " isn't i386 executable\n" << die(); // unused: e_version. We only support version 1, and later versions will be backwards compatible. uint32_t e_entry = u32_in(&elf_contents[24]); uint32_t e_phoff = u32_in(&elf_contents[28]); // unused: e_shoff // unused: e_flags uint32_t e_ehsize = u16_in(&elf_contents[40]); if (e_ehsize < 52) raise << "Invalid binary; ELF header too small\n" << die(); uint32_t e_phentsize = u16_in(&elf_contents[42]); uint32_t e_phnum = u16_in(&elf_contents[44]); info << e_phnum << " entries in the program header, each " << e_phentsize << " bytes long\n"; // unused: e_shentsize // unused: e_shnum // unused: e_shstrndx for (size_t i = 0; i < e_phnum; ++i) load_segment_from_program_header(elf_contents, size, e_phoff + i*e_phentsize, e_ehsize); // initialize code and stack Reg[ESP].u = AFTER_STACK; Reg[EBP].u = 0; EIP = e_entry; } void load_segment_from_program_header(uint8_t* elf_contents, size_t size, uint32_t offset, uint32_t e_ehsize) { uint32_t p_type = u32_in(&elf_contents[offset]); info << "program header at offset " << offset << ": type " << p_type << '\n'; if (p_type != 1) { info << "ignoring segment at offset " << offset << " of non PT_LOAD type " << p_type << " (see http://refspecs.linuxbase.org/elf/elf.pdf)\n"; return; } uint32_t p_offset = u32_in(&elf_contents[offset + 4]); uint32_t p_vaddr = u32_in(&elf_contents[offset + 8]); if (e_ehsize > p_vaddr) raise << "Invalid binary; program header overlaps ELF header\n" << die(); if ((p_vaddr & 0xfffff000) != 0x08048000) raise << "Currently only supporting binaries starting in the default page 0x08048000, but code segment starts at 0x" << HEXWORD << p_vaddr << '\n' << die(); // unused: p_paddr uint32_t p_filesz = u32_in(&elf_contents[offset + 16]); uint32_t p_memsz = u32_in(&elf_contents[offset + 20]); if (p_filesz != p_memsz) raise << "Can't handle segments where p_filesz != p_memsz (see http://refspecs.linuxbase.org/elf/elf.pdf)\n" << die(); if (p_offset + p_filesz > size) raise << "Invalid binary; segment at offset " << offset << " is too large: wants to end at " << p_offset+p_filesz << " but the file ends at " << size << '\n' << die(); if (Mem.size() < p_vaddr + p_memsz) Mem.resize(p_vaddr + p_memsz); if (size > p_memsz) size = p_memsz; info << "blitting file offsets (" << p_offset << ", " << (p_offset+p_filesz) << ") to addresses (" << p_vaddr << ", " << (p_vaddr+p_memsz) << ")\n"; for (size_t i = 0; i < p_filesz; ++i) write_mem_u8(p_vaddr+i, elf_contents[p_offset+i]); if (End_of_program < p_vaddr+p_memsz) End_of_program = p_vaddr+p_memsz; } :(before "End Includes") // Very primitive/fixed/insecure ELF segments for now. // code: 0x08048000 -> 0x08048fff // data: 0x08049000 -> 0x08049fff // heap: 0x0804a000 -> 0x0804afff // stack: 0x0804bfff -> 0x0804b000 (downward) const int CODE_START = 0x08048000; const int SEGMENT_SIZE = 0x1000; const int DATA_START = 0x08049000; const int AFTER_STACK = 0x0804c000; :(code) void initialize_mem() { Mem.resize(AFTER_STACK - CODE_START); } inline uint32_t u32_in(uint8_t* p) { return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; } inline uint16_t u16_in(uint8_t* p) { return p[0] | p[1] << 8; } :(before "End Types") struct perr {}; :(code) ostream& operator<<(ostream& os, unused perr) { if (errno) os << ": " << strerror(errno); return os; } :(before "End Types") struct die {}; :(code) ostream& operator<<(unused ostream& os, unused die) { if (Trace_stream) Trace_stream->newline(); exit(1); } :(before "End Includes") #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdarg.h> #include <errno.h> #define info cerr // #define info dbg


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