mirror of
https://github.com/frida/tinycc
synced 2024-11-24 16:49:44 +03:00
3877618785
Add __attribute__((constructor)) to __bounds_init. - remove tcc_add_bcheck from i386-link.c and x86_64-link.c - add simplified tcc_add_bcheck to tccelf.c - Update tccrun.c to call constructor/destructor. Set dynsym sh_info to number of local symbols in tccelf.c Reduce stack size when bounds checking is enabled. Added variable TCC_LIBBCHECK for windows support. Add signal stack to detect stack overflow. Add all & parameters in lbound_section and remove them if not used. Close fd in tcc_relocate in tccrun.c Fix section type constructor/destructor in tccelf.c Add check code in tests/boundtest.c for mem/str functions. Remove -ba from documentation. Add bounds check signal info in documentation. bcheck.c: - Fix initial_pool alignment. . Fix printf statements. . Add prototypes for all external interface functions. - Add TCC_BOUNDS_WARN_POINTER_ADD environment variable. . Add ctype and errno data. - Fix alloca when multithreading is used. - Add lock for __bound_checking and __bound_never_fatal. - Catch pthread_create and use locks when called. - Detect in loaded in shared lib and use locks when found - Use spin locks instead of semaphore locks. - Make spin locked code as small as possible. - Fix mem/str functions checking. - Fix overlap checking mem/str functions.
239 lines
6.6 KiB
C
239 lines
6.6 KiB
C
#ifdef TARGET_DEFS_ONLY
|
|
|
|
#define EM_TCC_TARGET EM_386
|
|
|
|
/* relocation type for 32 bit data relocation */
|
|
#define R_DATA_32 R_386_32
|
|
#define R_DATA_PTR R_386_32
|
|
#define R_JMP_SLOT R_386_JMP_SLOT
|
|
#define R_GLOB_DAT R_386_GLOB_DAT
|
|
#define R_COPY R_386_COPY
|
|
#define R_RELATIVE R_386_RELATIVE
|
|
|
|
#define R_NUM R_386_NUM
|
|
|
|
#define ELF_START_ADDR 0x08048000
|
|
#define ELF_PAGE_SIZE 0x1000
|
|
|
|
#define PCRELATIVE_DLLPLT 0
|
|
#define RELOCATE_DLLPLT 0
|
|
|
|
#else /* !TARGET_DEFS_ONLY */
|
|
|
|
#include "tcc.h"
|
|
|
|
#ifndef ELF_OBJ_ONLY
|
|
/* Returns 1 for a code relocation, 0 for a data relocation. For unknown
|
|
relocations, returns -1. */
|
|
int code_reloc (int reloc_type)
|
|
{
|
|
switch (reloc_type) {
|
|
case R_386_RELATIVE:
|
|
case R_386_16:
|
|
case R_386_32:
|
|
case R_386_GOTPC:
|
|
case R_386_GOTOFF:
|
|
case R_386_GOT32:
|
|
case R_386_GOT32X:
|
|
case R_386_GLOB_DAT:
|
|
case R_386_COPY:
|
|
return 0;
|
|
|
|
case R_386_PC16:
|
|
case R_386_PC32:
|
|
case R_386_PLT32:
|
|
case R_386_JMP_SLOT:
|
|
return 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Returns an enumerator to describe whether and when the relocation needs a
|
|
GOT and/or PLT entry to be created. See tcc.h for a description of the
|
|
different values. */
|
|
int gotplt_entry_type (int reloc_type)
|
|
{
|
|
switch (reloc_type) {
|
|
case R_386_RELATIVE:
|
|
case R_386_16:
|
|
case R_386_GLOB_DAT:
|
|
case R_386_JMP_SLOT:
|
|
case R_386_COPY:
|
|
return NO_GOTPLT_ENTRY;
|
|
|
|
case R_386_32:
|
|
/* This relocations shouldn't normally need GOT or PLT
|
|
slots if it weren't for simplicity in the code generator.
|
|
See our caller for comments. */
|
|
return AUTO_GOTPLT_ENTRY;
|
|
|
|
case R_386_PC16:
|
|
case R_386_PC32:
|
|
return AUTO_GOTPLT_ENTRY;
|
|
|
|
case R_386_GOTPC:
|
|
case R_386_GOTOFF:
|
|
return BUILD_GOT_ONLY;
|
|
|
|
case R_386_GOT32:
|
|
case R_386_GOT32X:
|
|
case R_386_PLT32:
|
|
return ALWAYS_GOTPLT_ENTRY;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
|
|
{
|
|
Section *plt = s1->plt;
|
|
uint8_t *p;
|
|
int modrm;
|
|
unsigned plt_offset, relofs;
|
|
|
|
/* on i386 if we build a DLL, we add a %ebx offset */
|
|
if (s1->output_type == TCC_OUTPUT_DLL)
|
|
modrm = 0xa3;
|
|
else
|
|
modrm = 0x25;
|
|
|
|
/* empty PLT: create PLT0 entry that pushes the library identifier
|
|
(GOT + PTR_SIZE) and jumps to ld.so resolution routine
|
|
(GOT + 2 * PTR_SIZE) */
|
|
if (plt->data_offset == 0) {
|
|
p = section_ptr_add(plt, 16);
|
|
p[0] = 0xff; /* pushl got + PTR_SIZE */
|
|
p[1] = modrm + 0x10;
|
|
write32le(p + 2, PTR_SIZE);
|
|
p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
|
|
p[7] = modrm;
|
|
write32le(p + 8, PTR_SIZE * 2);
|
|
}
|
|
plt_offset = plt->data_offset;
|
|
|
|
/* The PLT slot refers to the relocation entry it needs via offset.
|
|
The reloc entry is created below, so its offset is the current
|
|
data_offset */
|
|
relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0;
|
|
|
|
/* Jump to GOT entry where ld.so initially put the address of ip + 4 */
|
|
p = section_ptr_add(plt, 16);
|
|
p[0] = 0xff; /* jmp *(got + x) */
|
|
p[1] = modrm;
|
|
write32le(p + 2, got_offset);
|
|
p[6] = 0x68; /* push $xxx */
|
|
write32le(p + 7, relofs);
|
|
p[11] = 0xe9; /* jmp plt_start */
|
|
write32le(p + 12, -(plt->data_offset));
|
|
return plt_offset;
|
|
}
|
|
|
|
/* relocate the PLT: compute addresses and offsets in the PLT now that final
|
|
address for PLT and GOT are known (see fill_program_header) */
|
|
ST_FUNC void relocate_plt(TCCState *s1)
|
|
{
|
|
uint8_t *p, *p_end;
|
|
|
|
if (!s1->plt)
|
|
return;
|
|
|
|
p = s1->plt->data;
|
|
p_end = p + s1->plt->data_offset;
|
|
|
|
if (p < p_end) {
|
|
add32le(p + 2, s1->got->sh_addr);
|
|
add32le(p + 8, s1->got->sh_addr);
|
|
p += 16;
|
|
while (p < p_end) {
|
|
add32le(p + 2, s1->got->sh_addr);
|
|
p += 16;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
|
|
{
|
|
int sym_index, esym_index;
|
|
|
|
sym_index = ELFW(R_SYM)(rel->r_info);
|
|
|
|
switch (type) {
|
|
case R_386_32:
|
|
if (s1->output_type == TCC_OUTPUT_DLL) {
|
|
esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
|
|
qrel->r_offset = rel->r_offset;
|
|
if (esym_index) {
|
|
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
|
|
qrel++;
|
|
return;
|
|
} else {
|
|
qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
|
|
qrel++;
|
|
}
|
|
}
|
|
add32le(ptr, val);
|
|
return;
|
|
case R_386_PC32:
|
|
if (s1->output_type == TCC_OUTPUT_DLL) {
|
|
/* DLL relocation */
|
|
esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
|
|
if (esym_index) {
|
|
qrel->r_offset = rel->r_offset;
|
|
qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
|
|
qrel++;
|
|
return;
|
|
}
|
|
}
|
|
add32le(ptr, val - addr);
|
|
return;
|
|
case R_386_PLT32:
|
|
add32le(ptr, val - addr);
|
|
return;
|
|
case R_386_GLOB_DAT:
|
|
case R_386_JMP_SLOT:
|
|
write32le(ptr, val);
|
|
return;
|
|
case R_386_GOTPC:
|
|
add32le(ptr, s1->got->sh_addr - addr);
|
|
return;
|
|
case R_386_GOTOFF:
|
|
add32le(ptr, val - s1->got->sh_addr);
|
|
return;
|
|
case R_386_GOT32:
|
|
case R_386_GOT32X:
|
|
/* we load the got offset */
|
|
add32le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset);
|
|
return;
|
|
case R_386_16:
|
|
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
|
|
output_file:
|
|
tcc_error("can only produce 16-bit binary files");
|
|
}
|
|
write16le(ptr, read16le(ptr) + val);
|
|
return;
|
|
case R_386_PC16:
|
|
if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
|
|
goto output_file;
|
|
write16le(ptr, read16le(ptr) + val - addr);
|
|
return;
|
|
case R_386_RELATIVE:
|
|
#ifdef TCC_TARGET_PE
|
|
add32le(ptr, val - s1->pe_imagebase);
|
|
#endif
|
|
/* do nothing */
|
|
return;
|
|
case R_386_COPY:
|
|
/* This relocation must copy initialized data from the library
|
|
to the program .bss segment. Currently made like for ARM
|
|
(to remove noise of default case). Is this true?
|
|
*/
|
|
return;
|
|
default:
|
|
fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
|
|
type, (unsigned)addr, ptr, (unsigned)val);
|
|
return;
|
|
}
|
|
}
|
|
|
|
#endif /* !TARGET_DEFS_ONLY */
|