* Copyright 2005, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
* All rights reserved. Distributed under the terms of the MIT License.
*
*
* Copyright 2002, Travis Geiselbrecht. All rights reserved.
* Distributed under the terms of the NewOS License.
*/
#ifdef _BOOT_MODE
#include <boot/arch.h>
#endif
#include <KernelExport.h>
#include <elf_priv.h>
#include <arch/elf.h>
#define CHATTY 0
#ifdef _BOOT_MODE
status_t
boot_arch_elf_relocate_rel(struct preloaded_elf32_image *image, Elf32_Rel *rel,
int rel_len)
#else
int
arch_elf_relocate_rel(struct elf_image_info *image,
struct elf_image_info *resolve_image, Elf32_Rel *rel, int rel_len)
#endif
{
return B_NO_ERROR;
}
static inline void
write_word32(addr_t P, Elf32_Word value)
{
*(Elf32_Word*)P = value;
}
static inline void
write_word30(addr_t P, Elf32_Word value)
{
*(Elf32_Word*)P = (*(Elf32_Word*)P & 0x3) | (value << 2);
}
static inline bool
write_low24_check(addr_t P, Elf32_Word value)
{
if ((value & 0x3f000000) && (~value & 0x3f800000))
return false;
*(Elf32_Word*)P = (*(Elf32_Word*)P & 0xfc000003)
| ((value & 0x00ffffff) << 2);
return true;
}
static inline bool
write_low14_check(addr_t P, Elf32_Word value)
{
if ((value & 0x3fffc000) && (~value & 0x3fffe000))
return false;
*(Elf32_Word*)P = (*(Elf32_Word*)P & 0xffff0003)
| ((value & 0x00003fff) << 2);
return true;
}
static inline void
write_half16(addr_t P, Elf32_Word value)
{
*(Elf32_Half*)P = (Elf32_Half)value;
}
static inline bool
write_half16_check(addr_t P, Elf32_Word value)
{
if ((value & 0xffff0000) && (~value & 0xffff8000))
return false;
*(Elf32_Half*)P = (Elf32_Half)value;
return true;
}
static inline Elf32_Word
lo(Elf32_Word value)
{
return (value & 0xffff);
}
static inline Elf32_Word
hi(Elf32_Word value)
{
return ((value >> 16) & 0xffff);
}
static inline Elf32_Word
ha(Elf32_Word value)
{
return (((value >> 16) + (value & 0x8000 ? 1 : 0)) & 0xffff);
}
#ifdef _BOOT_MODE
status_t
boot_arch_elf_relocate_rela(struct preloaded_elf32_image *image,
Elf32_Rela *rel, int rel_len)
#else
int
arch_elf_relocate_rela(struct elf_image_info *image,
struct elf_image_info *resolve_image, Elf32_Rela *rel, int rel_len)
#endif
{
int i;
Elf32_Sym *sym;
int vlErr;
Elf32_Addr S = 0;
addr_t R = 0;
addr_t G = 0;
addr_t L = 0;
#define P ((addr_t)(image->text_region.delta + rel[i].r_offset))
#define A ((addr_t)rel[i].r_addend)
#define B (image->text_region.delta)
#define REQUIRE_GOT \
if (G == 0) { \
dprintf("arch_elf_relocate_rela(): Failed to get GOT address!\n"); \
return B_ERROR; \
}
#define REQUIRE_PLT \
if (L == 0) { \
dprintf("arch_elf_relocate_rela(): Failed to get PLT address!\n"); \
return B_ERROR; \
}
for (i = 0; i * (int)sizeof(Elf32_Rela) < rel_len; i++) {
#if CHATTY
dprintf("looking at rel type %d, offset 0x%lx, sym 0x%lx, addend 0x%lx\n",
ELF32_R_TYPE(rel[i].r_info), rel[i].r_offset, ELF32_R_SYM(rel[i].r_info), rel[i].r_addend);
#endif
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_PPC_SECTOFF:
case R_PPC_SECTOFF_LO:
case R_PPC_SECTOFF_HI:
case R_PPC_SECTOFF_HA:
dprintf("arch_elf_relocate_rela(): Getting section relative "
"symbol addresses not yet supported!\n");
return B_ERROR;
case R_PPC_ADDR32:
case R_PPC_ADDR24:
case R_PPC_ADDR16:
case R_PPC_ADDR16_LO:
case R_PPC_ADDR16_HI:
case R_PPC_ADDR16_HA:
case R_PPC_ADDR14:
case R_PPC_ADDR14_BRTAKEN:
case R_PPC_ADDR14_BRNTAKEN:
case R_PPC_REL24:
case R_PPC_REL14:
case R_PPC_REL14_BRTAKEN:
case R_PPC_REL14_BRNTAKEN:
case R_PPC_GLOB_DAT:
case R_PPC_UADDR32:
case R_PPC_UADDR16:
case R_PPC_REL32:
case R_PPC_SDAREL16:
case R_PPC_ADDR30:
case R_PPC_JMP_SLOT:
sym = SYMBOL(image, ELF32_R_SYM(rel[i].r_info));
#ifdef _BOOT_MODE
vlErr = boot_elf_resolve_symbol(image, sym, &S);
#else
vlErr = elf_resolve_symbol(image, sym, resolve_image, &S);
#endif
if (vlErr < 0) {
dprintf("%s(): Failed to relocate "
"entry index %d, rel type %d, offset 0x%lx, sym 0x%lx, "
"addend 0x%lx\n", __FUNCTION__, i, ELF32_R_TYPE(rel[i].r_info),
rel[i].r_offset, ELF32_R_SYM(rel[i].r_info),
rel[i].r_addend);
return vlErr;
}
break;
}
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_PPC_NONE:
break;
case R_PPC_COPY:
dprintf("arch_elf_relocate_rela(): R_PPC_COPY not yet "
"supported!\n");
return B_ERROR;
case R_PPC_ADDR32:
case R_PPC_GLOB_DAT:
case R_PPC_UADDR32:
write_word32(P, S + A);
break;
case R_PPC_ADDR24:
if (write_low24_check(P, (S + A) >> 2))
break;
dprintf("R_PPC_ADDR24 overflow\n");
return B_BAD_DATA;
case R_PPC_ADDR16:
case R_PPC_UADDR16:
if (write_half16_check(P, S + A))
break;
dprintf("R_PPC_ADDR16 overflow\n");
return B_BAD_DATA;
case R_PPC_ADDR16_LO:
write_half16(P, lo(S + A));
break;
case R_PPC_ADDR16_HI:
write_half16(P, hi(S + A));
break;
case R_PPC_ADDR16_HA:
write_half16(P, ha(S + A));
break;
case R_PPC_ADDR14:
case R_PPC_ADDR14_BRTAKEN:
case R_PPC_ADDR14_BRNTAKEN:
if (write_low14_check(P, (S + A) >> 2))
break;
dprintf("R_PPC_ADDR14 overflow\n");
return B_BAD_DATA;
case R_PPC_REL24:
if (write_low24_check(P, (S + A - P) >> 2))
break;
dprintf("R_PPC_REL24 overflow: 0x%lx\n", (S + A - P) >> 2);
return B_BAD_DATA;
case R_PPC_REL14:
case R_PPC_REL14_BRTAKEN:
case R_PPC_REL14_BRNTAKEN:
if (write_low14_check(P, (S + A - P) >> 2))
break;
dprintf("R_PPC_REL14 overflow\n");
return B_BAD_DATA;
case R_PPC_GOT16:
REQUIRE_GOT;
if (write_half16_check(P, G + A))
break;
dprintf("R_PPC_GOT16 overflow\n");
return B_BAD_DATA;
case R_PPC_GOT16_LO:
REQUIRE_GOT;
write_half16(P, lo(G + A));
break;
case R_PPC_GOT16_HI:
REQUIRE_GOT;
write_half16(P, hi(G + A));
break;
case R_PPC_GOT16_HA:
REQUIRE_GOT;
write_half16(P, ha(G + A));
break;
case R_PPC_JMP_SLOT:
{
addr_t jumpOffset = S - P;
if ((jumpOffset & 0xfc000000) != 0
&& (~jumpOffset & 0xfe000000) != 0) {
dprintf("arch_elf_relocate_rela(): R_PPC_JMP_SLOT: "
"Offsets > 24 bit currently not supported!\n");
dprintf("jumpOffset: %p\n", (void*)jumpOffset);
return B_ERROR;
} else {
*(uint32*)P = 0x48000000 | ((jumpOffset) & 0x03fffffc);
}
break;
}
case R_PPC_RELATIVE:
write_word32(P, B + A);
break;
case R_PPC_LOCAL24PC:
dprintf("arch_elf_relocate_rela(): R_PPC_LOCAL24PC not yet "
"supported!\n");
return B_ERROR;
case R_PPC_REL32:
write_word32(P, S + A - P);
break;
case R_PPC_PLTREL24:
REQUIRE_PLT;
if (write_low24_check(P, (L + A - P) >> 2))
break;
dprintf("R_PPC_PLTREL24 overflow\n");
return B_BAD_DATA;
case R_PPC_PLT32:
REQUIRE_PLT;
write_word32(P, L + A);
break;
case R_PPC_PLTREL32:
REQUIRE_PLT;
write_word32(P, L + A - P);
break;
case R_PPC_PLT16_LO:
REQUIRE_PLT;
write_half16(P, lo(L + A));
break;
case R_PPC_PLT16_HI:
REQUIRE_PLT;
write_half16(P, hi(L + A));
break;
case R_PPC_PLT16_HA:
write_half16(P, ha(L + A));
break;
case R_PPC_SDAREL16:
dprintf("arch_elf_relocate_rela(): R_PPC_SDAREL16 not yet "
"supported!\n");
return B_ERROR;
case R_PPC_SECTOFF:
if (write_half16_check(P, R + A))
break;
dprintf("R_PPC_SECTOFF overflow\n");
return B_BAD_DATA;
case R_PPC_SECTOFF_LO:
write_half16(P, lo(R + A));
break;
case R_PPC_SECTOFF_HI:
write_half16(P, hi(R + A));
break;
case R_PPC_SECTOFF_HA:
write_half16(P, ha(R + A));
break;
case R_PPC_ADDR30:
write_word30(P, (S + A - P) >> 2);
break;
default:
dprintf("arch_elf_relocate_rela: unhandled relocation type %d\n", ELF32_R_TYPE(rel[i].r_info));
return B_ERROR;
}
}
return B_NO_ERROR;
}
