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Linux i386 allow compression of position-independent main executables (gcc -pie).

Browse Source 
p_elf.h p_lx_elf.cpp p_lx_elf.h p_lx_exc.cpp
	stub/fold_elf86.asm stub/fold_elf86.h stub/l_lx_elf.c
	stub/l_lx_elf86.asm stub/l_lx_elf86.h stub/l_lx_elf86.lds
	stub/linux.hh

committer: jreiser <jreiser> 1126886896 +0000
This commit is contained in:
John Reiser
2005-09-16 16:08:16 +00:00
parent eb6c51426a
commit 3f7b642c7d
11 changed files with 761 additions and 515 deletions
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src/p_elf.h
+51
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@@ -181,12 +181,59 @@ struct Dyn
enum { // d_tag
DT_NULL = 0, /* End flag */
DT_NEEDED = 1, /* Name of needed library */
DT_HASH = 4, /* Hash table of symbol names */
DT_STRTAB = 5, /* String table */
DT_SYMTAB = 6, /* Symbol table */
DT_STRSZ = 10, /* Sizeof string table */
};
}
__attribute_packed;
template <class TT16, class TT32, class TT64>
struct Sym
{
TT32 st_name; /* symbol name (index into string table) */
TT32 st_value; /* symbol value */
TT32 st_size; /* symbol size */
unsigned char st_info; /* symbol type and binding */
unsigned char st_other; /* symbol visibility */
TT16 st_shndx; /* section index */
unsigned int st_bind(unsigned int x) const { return 0xf & (x>>4); }
unsigned int st_type(unsigned int x) const { return 0xf & x ; }
unsigned char St_info(unsigned bind, unsigned type) const { return (bind<<4) + (0xf & type); }
enum { // st_bind (high 4 bits of st_info)
STB_LOCAL = 0, /* Local symbol */
STB_GLOBAL = 1, /* Global symbol */
STB_WEAK = 2, /* Weak symbol */
};
enum { // st_type (low 4 bits of st_info)
STT_NOTYPE = 0, /* Symbol type is unspecified */
STT_OBJECT = 1, /* Symbol is a data object */
STT_FUNC = 2, /* Symbol is a code object */
STT_SECTION = 3, /* Symbol associated with a section */
STT_FILE = 4, /* Symbol's name is file name */
STT_COMMON = 5, /* Symbol is a common data object */
STT_TLS = 6, /* Symbol is thread-local data object*/
};
enum { // st_other (visibility)
STV_DEFAULT = 0, /* Default symbol visibility rules */
STV_INTERNAL = 1, /* Processor specific hidden class */
STV_HIDDEN = 2, /* Sym unavailable in other modules */
STV_PROTECTED= 3, /* Not preemptible, not exported */
};
enum { // st_shndx
SHN_UNDEF = 0, /* Undefined section */
SHN_ABS = 0xfff1, /* Associated symbol is absolute */
SHN_COMMON = 0xfff2, /* Associated symbol is common */
};
}
__attribute_packed;
} // namespace
@@ -198,22 +245,26 @@ typedef TT_Elf32::Ehdr<LE16,LE32,void> Elf_LE32_Ehdr;
typedef TT_Elf32::Phdr<LE16,LE32,void> Elf_LE32_Phdr;
typedef TT_Elf32::Shdr<LE16,LE32,void> Elf_LE32_Shdr;
typedef TT_Elf32::Dyn <LE16,LE32,void> Elf_LE32_Dyn;
typedef TT_Elf32::Sym <LE16,LE32,void> Elf_LE32_Sym;
typedef TT_Elf32::Ehdr<unsigned short,unsigned int,void> Elf32_Ehdr;
typedef TT_Elf32::Phdr<unsigned short,unsigned int,void> Elf32_Phdr;
typedef TT_Elf32::Shdr<unsigned short,unsigned int,void> Elf32_Shdr;
typedef TT_Elf32::Dyn <unsigned short,unsigned int,void> Elf32_Dyn;
typedef TT_Elf32::Sym <unsigned short,unsigned int,void> Elf32_Sym;
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf_LE32_Ehdr) == 52)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf_LE32_Phdr) == 32)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf_LE32_Shdr) == 40)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf_LE32_Dyn) == 8)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf_LE32_Sym) == 16)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf32_Ehdr) == 52)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf32_Phdr) == 32)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf32_Shdr) == 40)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf32_Dyn) == 8)
ACC_COMPILE_TIME_ASSERT_HEADER(sizeof(Elf32_Sym) == 16)
#endif /* already included */