mirror of
https://github.com/frida/tinycc
synced 2024-12-24 22:16:49 +03:00
1353ccd9e2
this is enough to let me link a tcctest.c compiled by GCC using some current debian sid riscv64 system. It needs linking against libgcc.a for various floating point TFmode routines. The result runs.
258 lines
8.5 KiB
C
258 lines
8.5 KiB
C
#ifdef TARGET_DEFS_ONLY
|
|
|
|
#define EM_TCC_TARGET EM_AARCH64
|
|
|
|
#define R_DATA_32 R_AARCH64_ABS32
|
|
#define R_DATA_PTR R_AARCH64_ABS64
|
|
#define R_JMP_SLOT R_AARCH64_JUMP_SLOT
|
|
#define R_GLOB_DAT R_AARCH64_GLOB_DAT
|
|
#define R_COPY R_AARCH64_COPY
|
|
#define R_RELATIVE R_AARCH64_RELATIVE
|
|
|
|
#define R_NUM R_AARCH64_NUM
|
|
|
|
#define ELF_START_ADDR 0x00400000
|
|
#define ELF_PAGE_SIZE 0x1000
|
|
|
|
#define PCRELATIVE_DLLPLT 1
|
|
#define RELOCATE_DLLPLT 1
|
|
|
|
#else /* !TARGET_DEFS_ONLY */
|
|
|
|
#include "tcc.h"
|
|
|
|
/* 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_AARCH64_ABS32:
|
|
case R_AARCH64_ABS64:
|
|
case R_AARCH64_PREL32:
|
|
case R_AARCH64_MOVW_UABS_G0_NC:
|
|
case R_AARCH64_MOVW_UABS_G1_NC:
|
|
case R_AARCH64_MOVW_UABS_G2_NC:
|
|
case R_AARCH64_MOVW_UABS_G3:
|
|
case R_AARCH64_ADR_PREL_PG_HI21:
|
|
case R_AARCH64_ADD_ABS_LO12_NC:
|
|
case R_AARCH64_ADR_GOT_PAGE:
|
|
case R_AARCH64_LD64_GOT_LO12_NC:
|
|
case R_AARCH64_GLOB_DAT:
|
|
case R_AARCH64_COPY:
|
|
return 0;
|
|
|
|
case R_AARCH64_JUMP26:
|
|
case R_AARCH64_CALL26:
|
|
case R_AARCH64_JUMP_SLOT:
|
|
return 1;
|
|
}
|
|
|
|
tcc_error ("Unknown relocation type: %d", reloc_type);
|
|
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_AARCH64_PREL32:
|
|
case R_AARCH64_MOVW_UABS_G0_NC:
|
|
case R_AARCH64_MOVW_UABS_G1_NC:
|
|
case R_AARCH64_MOVW_UABS_G2_NC:
|
|
case R_AARCH64_MOVW_UABS_G3:
|
|
case R_AARCH64_ADR_PREL_PG_HI21:
|
|
case R_AARCH64_ADD_ABS_LO12_NC:
|
|
case R_AARCH64_GLOB_DAT:
|
|
case R_AARCH64_JUMP_SLOT:
|
|
case R_AARCH64_COPY:
|
|
return NO_GOTPLT_ENTRY;
|
|
|
|
case R_AARCH64_ABS32:
|
|
case R_AARCH64_ABS64:
|
|
case R_AARCH64_JUMP26:
|
|
case R_AARCH64_CALL26:
|
|
return AUTO_GOTPLT_ENTRY;
|
|
|
|
case R_AARCH64_ADR_GOT_PAGE:
|
|
case R_AARCH64_LD64_GOT_LO12_NC:
|
|
return ALWAYS_GOTPLT_ENTRY;
|
|
}
|
|
|
|
tcc_error ("Unknown relocation type: %d", reloc_type);
|
|
return -1;
|
|
}
|
|
|
|
ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
|
|
{
|
|
Section *plt = s1->plt;
|
|
uint8_t *p;
|
|
unsigned plt_offset;
|
|
|
|
if (s1->output_type == TCC_OUTPUT_DLL)
|
|
tcc_error("DLLs unimplemented!");
|
|
|
|
if (plt->data_offset == 0) {
|
|
section_ptr_add(plt, 32);
|
|
}
|
|
plt_offset = plt->data_offset;
|
|
|
|
p = section_ptr_add(plt, 16);
|
|
write32le(p, got_offset);
|
|
write32le(p + 4, (uint64_t) got_offset >> 32);
|
|
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) {
|
|
uint64_t plt = s1->plt->sh_addr;
|
|
uint64_t got = s1->got->sh_addr;
|
|
uint64_t off = (got >> 12) - (plt >> 12);
|
|
if ((off + ((uint32_t)1 << 20)) >> 21)
|
|
tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
|
|
write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
|
|
write32le(p + 4, (0x90000010 | // adrp x16,...
|
|
(off & 0x1ffffc) << 3 | (off & 3) << 29));
|
|
write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
|
|
(got & 0xff8) << 7));
|
|
write32le(p + 12, (0x91000210 | // add x16,x16,#...
|
|
(got & 0xfff) << 10));
|
|
write32le(p + 16, 0xd61f0220); // br x17
|
|
write32le(p + 20, 0xd503201f); // nop
|
|
write32le(p + 24, 0xd503201f); // nop
|
|
write32le(p + 28, 0xd503201f); // nop
|
|
p += 32;
|
|
while (p < p_end) {
|
|
uint64_t pc = plt + (p - s1->plt->data);
|
|
uint64_t addr = got + read64le(p);
|
|
uint64_t off = (addr >> 12) - (pc >> 12);
|
|
if ((off + ((uint32_t)1 << 20)) >> 21)
|
|
tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
|
|
write32le(p, (0x90000010 | // adrp x16,...
|
|
(off & 0x1ffffc) << 3 | (off & 3) << 29));
|
|
write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
|
|
(addr & 0xff8) << 7));
|
|
write32le(p + 8, (0x91000210 | // add x16,x16,#...
|
|
(addr & 0xfff) << 10));
|
|
write32le(p + 12, 0xd61f0220); // br x17
|
|
p += 16;
|
|
}
|
|
}
|
|
}
|
|
|
|
void relocate_init(Section *sr) {}
|
|
void relocate_fini(Section *sr) {}
|
|
|
|
void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
|
|
{
|
|
int sym_index = ELFW(R_SYM)(rel->r_info);
|
|
#ifdef DEBUG_RELOC
|
|
ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
|
#endif
|
|
|
|
switch(type) {
|
|
case R_AARCH64_ABS64:
|
|
write64le(ptr, val);
|
|
return;
|
|
case R_AARCH64_ABS32:
|
|
write32le(ptr, val);
|
|
return;
|
|
case R_AARCH64_PREL32:
|
|
write32le(ptr, val - addr);
|
|
return;
|
|
case R_AARCH64_MOVW_UABS_G0_NC:
|
|
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
|
|
(val & 0xffff) << 5));
|
|
return;
|
|
case R_AARCH64_MOVW_UABS_G1_NC:
|
|
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
|
|
(val >> 16 & 0xffff) << 5));
|
|
return;
|
|
case R_AARCH64_MOVW_UABS_G2_NC:
|
|
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
|
|
(val >> 32 & 0xffff) << 5));
|
|
return;
|
|
case R_AARCH64_MOVW_UABS_G3:
|
|
write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
|
|
(val >> 48 & 0xffff) << 5));
|
|
return;
|
|
case R_AARCH64_ADR_PREL_PG_HI21: {
|
|
uint64_t off = (val >> 12) - (addr >> 12);
|
|
if ((off + ((uint64_t)1 << 20)) >> 21)
|
|
tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
|
|
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
|
|
(off & 0x1ffffc) << 3 | (off & 3) << 29));
|
|
return;
|
|
}
|
|
case R_AARCH64_ADD_ABS_LO12_NC:
|
|
write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
|
|
(val & 0xfff) << 10));
|
|
return;
|
|
case R_AARCH64_JUMP26:
|
|
case R_AARCH64_CALL26:
|
|
#ifdef DEBUG_RELOC
|
|
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
|
|
(char *) symtab_section->link->data + sym->st_name);
|
|
#endif
|
|
if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
|
|
tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
|
|
" (val=%lx, addr=%lx)", val, addr);
|
|
write32le(ptr, (0x14000000 |
|
|
(uint32_t)(type == R_AARCH64_CALL26) << 31 |
|
|
((val - addr) >> 2 & 0x3ffffff)));
|
|
return;
|
|
case R_AARCH64_ADR_GOT_PAGE: {
|
|
uint64_t off =
|
|
(((s1->got->sh_addr +
|
|
get_sym_attr(s1, sym_index, 0)->got_offset) >> 12) - (addr >> 12));
|
|
if ((off + ((uint64_t)1 << 20)) >> 21)
|
|
tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
|
|
write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
|
|
(off & 0x1ffffc) << 3 | (off & 3) << 29));
|
|
return;
|
|
}
|
|
case R_AARCH64_LD64_GOT_LO12_NC:
|
|
write32le(ptr,
|
|
((read32le(ptr) & 0xfff803ff) |
|
|
((s1->got->sh_addr +
|
|
get_sym_attr(s1, sym_index, 0)->got_offset) & 0xff8) << 7));
|
|
return;
|
|
case R_AARCH64_COPY:
|
|
return;
|
|
case R_AARCH64_GLOB_DAT:
|
|
case R_AARCH64_JUMP_SLOT:
|
|
/* They don't need addend */
|
|
#ifdef DEBUG_RELOC
|
|
printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
|
|
val - rel->r_addend,
|
|
(char *) symtab_section->link->data + sym->st_name);
|
|
#endif
|
|
write64le(ptr, val - rel->r_addend);
|
|
return;
|
|
case R_AARCH64_RELATIVE:
|
|
#ifdef TCC_TARGET_PE
|
|
add32le(ptr, val - s1->pe_imagebase);
|
|
#endif
|
|
/* do nothing */
|
|
return;
|
|
default:
|
|
fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
|
|
type, (unsigned)addr, ptr, (unsigned)val);
|
|
return;
|
|
}
|
|
}
|
|
|
|
#endif /* !TARGET_DEFS_ONLY */
|