*/
#include <string.h>
#include <mach/boolean.h>
-#include <mach/machine.h>
#include <sys/types.h>
#if KERNEL
#include <libkern/libkern.h>
+ #include <mach/machine.h>
#else
- #include <libkern/OSByteOrder.h>
#include <stdlib.h>
+ #include <libkern/OSByteOrder.h>
+
+ /* Get machine.h from the kernel source so we can support all platforms
+ * that the kernel supports. Otherwise we're at the mercy of the host.
+ */
+ #include "../../osfmk/mach/machine.h"
#endif
#define DEBUG_ASSERT_COMPONENT_NAME_STRING "kxld"
#include "kxld_util.h"
#include "kxld_vtable.h"
+#if KXLD_PIC_KEXTS
+/* This will try to pull in mach/machine.h, so it has to come after the
+ * explicit include above.
+ */
+#include <mach-o/loader.h>
+#endif
+
/* include target-specific relocation prototypes */
#include <mach-o/reloc.h>
-#if KXLD_USER_OR_PPC
-#include <mach-o/ppc/reloc.h>
-#endif
#if KXLD_USER_OR_X86_64
#include <mach-o/x86_64/reloc.h>
#endif
#if KXLD_USER_OR_ARM
#include <mach-o/arm/reloc.h>
#endif
+#if KXLD_USER_OR_ARM64
+#include <mach-o/arm64/reloc.h>
+#endif
#define KXLD_TARGET_NONE (u_int) 0x0
#define KXLD_TARGET_VALUE (u_int) 0x1
#if KXLD_USER_OR_I386
static boolean_t generic_reloc_has_pair(u_int _type)
__attribute__((const));
-static boolean_t generic_reloc_is_pair(u_int _type, u_int _prev_type)
+static u_int generic_reloc_get_pair_type(u_int _prev_type)
__attribute__((const));
static boolean_t generic_reloc_has_got(u_int _type)
__attribute__((const));
kxld_addr_t pair_target, boolean_t swap);
#endif /* KXLD_USER_OR_I386 */
-#if KXLD_USER_OR_PPC
-static boolean_t ppc_reloc_has_pair(u_int _type)
- __attribute__((const));
-static boolean_t ppc_reloc_is_pair(u_int _type, u_int _prev_type)
- __attribute__((const));
-static boolean_t ppc_reloc_has_got(u_int _type)
- __attribute__((const));
-static kern_return_t ppc_process_reloc(const KXLDRelocator *relocator,
- u_char *instruction, u_int length, u_int pcrel, kxld_addr_t base_pc,
- kxld_addr_t link_pc, kxld_addr_t link_disp, u_int type, kxld_addr_t target,
- kxld_addr_t pair_target, boolean_t swap);
-#endif /* KXLD_USER_OR_PPC */
-
#if KXLD_USER_OR_X86_64
static boolean_t x86_64_reloc_has_pair(u_int _type)
__attribute__((const));
-static boolean_t x86_64_reloc_is_pair(u_int _type, u_int _prev_type)
+static u_int x86_64_reloc_get_pair_type(u_int _prev_type)
__attribute__((const));
static boolean_t x86_64_reloc_has_got(u_int _type)
__attribute__((const));
#if KXLD_USER_OR_ARM
static boolean_t arm_reloc_has_pair(u_int _type)
__attribute__((const));
-static boolean_t arm_reloc_is_pair(u_int _type, u_int _prev_type)
+static u_int arm_reloc_get_pair_type(u_int _prev_type)
__attribute__((const));
static boolean_t arm_reloc_has_got(u_int _type)
__attribute__((const));
kxld_addr_t pair_target, boolean_t swap);
#endif /* KXLD_USER_OR_ARM */
+#if KXLD_USER_OR_ARM64
+static boolean_t arm64_reloc_has_pair(u_int _type)
+ __attribute__((const));
+static u_int arm64_reloc_get_pair_type(u_int _prev_type)
+ __attribute__((const));
+static boolean_t arm64_reloc_has_got(u_int _type)
+ __attribute__((const));
+static kern_return_t arm64_process_reloc(const KXLDRelocator *relocator,
+ u_char *instruction, u_int length, u_int pcrel, kxld_addr_t base_pc,
+ kxld_addr_t link_pc, kxld_addr_t link_disp, u_int type, kxld_addr_t target,
+ kxld_addr_t pair_target, boolean_t swap);
+#endif /* KXLD_USER_OR_ARM64 */
+
#if KXLD_USER_OR_ILP32
static kxld_addr_t get_pointer_at_addr_32(const KXLDRelocator *relocator,
const u_char *data, u_long offset)
static kern_return_t check_for_direct_pure_virtual_call(
const KXLDRelocator *relocator, u_long offset);
+#if KXLD_PIC_KEXTS
+static u_long get_macho_data_size_for_array(const KXLDArray *relocs);
+
+static kern_return_t export_macho_for_array(const KXLDRelocator *relocator,
+ const KXLDArray *relocs, struct relocation_info **dstp);
+#endif /* KXLD_PIC_KEXTS */
+
/*******************************************************************************
*******************************************************************************/
kern_return_t
kern_return_t rval = KERN_FAILURE;
check(relocator);
-
+
switch(cputype) {
#if KXLD_USER_OR_I386
case CPU_TYPE_I386:
relocator->reloc_has_pair = generic_reloc_has_pair;
- relocator->reloc_is_pair = generic_reloc_is_pair;
+ relocator->reloc_get_pair_type = generic_reloc_get_pair_type;
relocator->reloc_has_got = generic_reloc_has_got;
relocator->process_reloc = generic_process_reloc;
relocator->function_align = 0;
relocator->is_32_bit = TRUE;
+ relocator->may_scatter = TRUE;
break;
#endif /* KXLD_USER_OR_I386 */
-#if KXLD_USER_OR_PPC
- case CPU_TYPE_POWERPC:
- relocator->reloc_has_pair = ppc_reloc_has_pair;
- relocator->reloc_is_pair = ppc_reloc_is_pair;
- relocator->reloc_has_got = ppc_reloc_has_got;
- relocator->process_reloc = ppc_process_reloc;
- relocator->function_align = 0;
- relocator->is_32_bit = TRUE;
- break;
-#endif /* KXLD_USER_OR_PPC */
#if KXLD_USER_OR_X86_64
case CPU_TYPE_X86_64:
relocator->reloc_has_pair = x86_64_reloc_has_pair;
- relocator->reloc_is_pair = x86_64_reloc_is_pair;
+ relocator->reloc_get_pair_type = x86_64_reloc_get_pair_type;
relocator->reloc_has_got = x86_64_reloc_has_got;
relocator->process_reloc = x86_64_process_reloc;
relocator->function_align = 0;
relocator->is_32_bit = FALSE;
+ relocator->may_scatter = FALSE;
break;
#endif /* KXLD_USER_OR_X86_64 */
#if KXLD_USER_OR_ARM
case CPU_TYPE_ARM:
relocator->reloc_has_pair = arm_reloc_has_pair;
- relocator->reloc_is_pair = arm_reloc_is_pair;
+ relocator->reloc_get_pair_type = arm_reloc_get_pair_type;
relocator->reloc_has_got = arm_reloc_has_got;
relocator->process_reloc = arm_process_reloc;
relocator->function_align = 1;
relocator->is_32_bit = TRUE;
+ relocator->may_scatter = FALSE;
break;
#endif /* KXLD_USER_OR_ARM */
+#if KXLD_USER_OR_ARM64
+ case CPU_TYPE_ARM64:
+ relocator->reloc_has_pair = arm64_reloc_has_pair;
+ relocator->reloc_get_pair_type = arm64_reloc_get_pair_type;
+ relocator->reloc_has_got = arm64_reloc_has_got;
+ relocator->process_reloc = arm64_process_reloc;
+ relocator->function_align = 0;
+ relocator->is_32_bit = FALSE;
+ relocator->may_scatter = FALSE;
+ break;
+#endif /* KXLD_USER_OR_ARM64 */
+
default:
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr,
* symbols.
*/
- if (!(src->r_address & R_SCATTERED) && !(src->r_extern) &&
- (R_ABS == src->r_symbolnum))
+ if (!(relocator->may_scatter && (src->r_address & R_SCATTERED)) &&
+ !(src->r_extern) && (R_ABS == src->r_symbolnum))
{
continue;
}
* Extern -> Symbolnum by Index
*/
reloc = kxld_array_get_item(relocarray, reloc_index++);
- if (src->r_address & R_SCATTERED) {
+ if (relocator->may_scatter && (src->r_address & R_SCATTERED)) {
reloc->address = scatsrc->r_address;
reloc->pcrel = scatsrc->r_pcrel;
reloc->length = scatsrc->r_length;
src = srcs + i;
scatsrc = (const struct scattered_relocation_info *) src;
- if (src->r_address & R_SCATTERED) {
- require_action(relocator->reloc_is_pair(
- scatsrc->r_type, reloc->reloc_type),
+ if (relocator->may_scatter && (src->r_address & R_SCATTERED)) {
+ require_action(relocator->reloc_get_pair_type(
+ reloc->reloc_type) == scatsrc->r_type,
finish, rval=KERN_FAILURE);
+ reloc->pair_address= scatsrc->r_address;
reloc->pair_target = scatsrc->r_value;
reloc->pair_target_type = KXLD_TARGET_LOOKUP;
} else {
- require_action(relocator->reloc_is_pair(src->r_type,
- reloc->reloc_type), finish, rval=KERN_FAILURE);
-
+ require_action(relocator->reloc_get_pair_type(
+ reloc->reloc_type) == scatsrc->r_type,
+ finish, rval=KERN_FAILURE);
+ reloc->pair_address = scatsrc->r_address;
if (src->r_extern) {
reloc->pair_target = src->r_symbolnum;
reloc->pair_target_type = KXLD_TARGET_SYMBOLNUM;
{
u_int num_nonpair_relocs = 0;
u_int i = 0;
- u_int prev_type = 0;
const struct relocation_info *reloc = NULL;
const struct scattered_relocation_info *sreloc = NULL;
/* Loop over all of the relocation entries */
num_nonpair_relocs = 1;
- prev_type = relocs->r_type;
for (i = 1; i < nrelocs; ++i) {
reloc = relocs + i;
sreloc = (const struct scattered_relocation_info *) reloc;
num_nonpair_relocs +=
- (!relocator->reloc_is_pair(sreloc->r_type, prev_type));
-
- prev_type = sreloc->r_type;
+ !relocator->reloc_has_pair(sreloc->r_type);
} else {
/* A normal relocation entry is relocatable if it is not a pair and
* if it is not a section-based relocation for an absolute symbol.
*/
num_nonpair_relocs +=
- !(relocator->reloc_is_pair(reloc->r_type, prev_type)
+ !(relocator->reloc_has_pair(reloc->r_type)
|| (0 == reloc->r_extern && R_ABS == reloc->r_symbolnum));
-
- prev_type = reloc->r_type;
}
}
/*******************************************************************************
*******************************************************************************/
-boolean_t
-kxld_relocator_is_pair(const KXLDRelocator *relocator, u_int r_type,
+u_int
+kxld_relocator_get_pair_type(const KXLDRelocator *relocator,
u_int prev_r_type)
{
check(relocator);
- return relocator->reloc_is_pair(r_type, prev_r_type);
+ return relocator->reloc_get_pair_type(prev_r_type);
}
/*******************************************************************************
return reloc;
}
+#if KXLD_PIC_KEXTS
+/*******************************************************************************
+*******************************************************************************/
+u_long
+kxld_reloc_get_macho_header_size()
+{
+ return sizeof(struct dysymtab_command);
+}
+
+/*******************************************************************************
+*******************************************************************************/
+u_long
+kxld_reloc_get_macho_data_size(const KXLDArray *locrelocs,
+ const KXLDArray *extrelocs)
+{
+ u_long rval = 0;
+
+ rval += get_macho_data_size_for_array(locrelocs);
+ rval += get_macho_data_size_for_array(extrelocs);
+
+ return (rval);
+}
+
+/*******************************************************************************
+*******************************************************************************/
+kern_return_t
+kxld_reloc_export_macho(const KXLDRelocator *relocator,
+ const KXLDArray *locrelocs, const KXLDArray *extrelocs,
+ u_char *buf, u_long *header_offset, u_long header_size,
+ u_long *data_offset, u_long size)
+{
+ kern_return_t rval = KERN_FAILURE;
+ struct dysymtab_command *dysymtabhdr = NULL;
+ struct relocation_info *start = NULL;
+ struct relocation_info *dst = NULL;
+ u_long count = 0;
+ u_long data_size = 0;
+
+ check(locrelocs);
+ check(extrelocs);
+ check(buf);
+ check(header_offset);
+ check(data_offset);
+
+ require_action(sizeof(*dysymtabhdr) <= header_size - *header_offset, finish, rval=KERN_FAILURE);
+ dysymtabhdr = (struct dysymtab_command *) ((void *) (buf + *header_offset));
+ *header_offset += sizeof(*dysymtabhdr);
+
+ data_size = kxld_reloc_get_macho_data_size(locrelocs, extrelocs);
+ require_action((*data_offset + data_size) <= size, finish, rval=KERN_FAILURE);
+
+ start = dst = (struct relocation_info *) ((void *) (buf + *data_offset));
+
+ rval = export_macho_for_array(relocator, locrelocs, &dst);
+ require_noerr(rval, finish);
+
+ rval = export_macho_for_array(relocator, extrelocs, &dst);
+ require_noerr(rval, finish);
+
+ count = dst - start;
+
+ memset(dysymtabhdr, 0, sizeof(*dysymtabhdr));
+ dysymtabhdr->cmd = LC_DYSYMTAB;
+ dysymtabhdr->cmdsize = (uint32_t) sizeof(*dysymtabhdr);
+ dysymtabhdr->locreloff = (uint32_t) *data_offset;
+ dysymtabhdr->nlocrel = (uint32_t) count;
+
+ *data_offset += count * sizeof(struct relocation_info);
+
+ rval = KERN_SUCCESS;
+finish:
+ return rval;
+}
+#endif /* KXLD_PIC_KEXTS */
+
/*******************************************************************************
*******************************************************************************/
kxld_addr_t
check(relocator);
- addr = *(const uint32_t *) (data + offset);
+ addr = *(const uint32_t *) ((void *) (data + offset));
#if !KERNEL
if (relocator->swap) {
addr = OSSwapInt32(addr);
check(relocator);
- addr = *(const uint64_t *) (data + offset);
+ addr = *(const uint64_t *) ((void *) (data + offset));
#if !KERNEL
if (relocator->swap) {
addr = OSSwapInt64(addr);
/*******************************************************************************
*******************************************************************************/
void
-kxld_relocator_set_vtables(KXLDRelocator *relocator,
- const struct kxld_dict *vtables)
+kxld_relocator_set_vtables(KXLDRelocator *relocator, const KXLDDict *vtables)
{
relocator->vtables = vtables;
}
*******************************************************************************/
kern_return_t
kxld_relocator_process_sect_reloc(KXLDRelocator *relocator,
- const KXLDReloc *reloc, const struct kxld_sect *sect)
+ const KXLDReloc *reloc, const KXLDSect *sect)
{
kern_return_t rval = KERN_FAILURE;
u_char *instruction = NULL;
return rval;
}
-#if KXLD_USER_OR_I386
+#if KXLD_PIC_KEXTS
/*******************************************************************************
*******************************************************************************/
-static boolean_t
-generic_reloc_has_pair(u_int _type)
+static u_long
+get_macho_data_size_for_array(const KXLDArray *relocs)
{
- enum reloc_type_generic type = _type;
-
- return (type == GENERIC_RELOC_SECTDIFF ||
- type == GENERIC_RELOC_LOCAL_SECTDIFF);
-}
+ const KXLDReloc *reloc = NULL;
+ u_int i = 0;
+ u_long size = 0;
-/*******************************************************************************
-*******************************************************************************/
-static boolean_t
-generic_reloc_is_pair(u_int _type, u_int _prev_type __unused)
-{
- enum reloc_type_generic type = _type;
+ check(relocs);
- return (type == GENERIC_RELOC_PAIR);
-}
+ for (i = 0; i < relocs->nitems; ++i) {
+ reloc = kxld_array_get_item(relocs, i);
+ if (!reloc->pcrel) {
+ size += sizeof(struct relocation_info);
+ if(reloc->pair_target_type != KXLD_TARGET_NONE) {
+ size += sizeof(struct relocation_info);
+ }
+ }
+ }
-/*******************************************************************************
-*******************************************************************************/
-static boolean_t generic_reloc_has_got(u_int _type __unused)
-{
- return FALSE;
+ return size;
}
/*******************************************************************************
*******************************************************************************/
-static kern_return_t
-generic_process_reloc(const KXLDRelocator *relocator, u_char *instruction,
- u_int length, u_int pcrel, kxld_addr_t _base_pc, kxld_addr_t _link_pc,
- kxld_addr_t _link_disp __unused, u_int _type, kxld_addr_t _target,
- kxld_addr_t _pair_target, boolean_t swap __unused)
+static kern_return_t
+export_macho_for_array(const KXLDRelocator *relocator,
+ const KXLDArray *relocs, struct relocation_info **dstp)
{
kern_return_t rval = KERN_FAILURE;
- uint32_t base_pc = (uint32_t) _base_pc;
- uint32_t link_pc = (uint32_t) _link_pc;
- uint32_t *instr_addr = NULL;
- uint32_t instr_data = 0;
- uint32_t target = (uint32_t) _target;
- uint32_t pair_target = (uint32_t) _pair_target;
- enum reloc_type_generic type = _type;
-
- check(instruction);
- require_action(length == 2, finish, rval=KERN_FAILURE);
+ const KXLDReloc *reloc = NULL;
+ struct relocation_info *dst = NULL;
+ struct scattered_relocation_info *scatdst = NULL;
+ u_int i = 0;
- if (pcrel) target = target + base_pc - link_pc;
+ dst = *dstp;
- instr_addr = (uint32_t *)instruction;
- instr_data = *instr_addr;
+ for (i = 0; i < relocs->nitems; ++i) {
+ reloc = kxld_array_get_item(relocs, i);
+ scatdst = (struct scattered_relocation_info *) dst;
-#if !KERNEL
- if (swap) instr_data = OSSwapInt32(instr_data);
-#endif
+ if (reloc->pcrel) {
+ continue;
+ }
- rval = check_for_direct_pure_virtual_call(relocator, instr_data);
- require_noerr(rval, finish);
+ switch (reloc->target_type) {
+ case KXLD_TARGET_LOOKUP:
+ scatdst->r_address = reloc->address;
+ scatdst->r_pcrel = reloc->pcrel;
+ scatdst->r_length = reloc->length;
+ scatdst->r_type = reloc->reloc_type;
+ scatdst->r_value = reloc->target;
+ scatdst->r_scattered = 1;
+ break;
+ case KXLD_TARGET_SECTNUM:
+ dst->r_address = reloc->address;
+ dst->r_pcrel = reloc->pcrel;
+ dst->r_length = reloc->length;
+ dst->r_type = reloc->reloc_type;
+ dst->r_symbolnum = reloc->target + 1;
+ dst->r_extern = 0;
+ break;
+ case KXLD_TARGET_SYMBOLNUM:
+ /* Assume that everything will be slid together; otherwise,
+ * there is no sensible value for the section number.
+ */
+ dst->r_address = reloc->address;
+ dst->r_pcrel = reloc->pcrel;
+ dst->r_length = reloc->length;
+ dst->r_type = reloc->reloc_type;
+ dst->r_symbolnum = 1;
+ dst->r_extern = 0;
+ break;
+ default:
+ rval = KERN_FAILURE;
+ goto finish;
+ }
- switch (type) {
- case GENERIC_RELOC_VANILLA:
- instr_data += target;
- break;
- case GENERIC_RELOC_SECTDIFF:
- case GENERIC_RELOC_LOCAL_SECTDIFF:
- instr_data = instr_data + target - pair_target;
- break;
- case GENERIC_RELOC_PB_LA_PTR:
- rval = KERN_FAILURE;
- goto finish;
- case GENERIC_RELOC_PAIR:
- default:
- rval = KERN_FAILURE;
- goto finish;
+ ++dst;
+
+ if(reloc->pair_target_type != KXLD_TARGET_NONE) {
+ ++i;
+ require_action(i < relocs->nitems, finish, rval=KERN_FAILURE);
+ scatdst = (struct scattered_relocation_info *) dst;
+ switch (reloc->pair_target_type) {
+ case KXLD_TARGET_LOOKUP:
+ scatdst->r_address = reloc->pair_address;
+ scatdst->r_pcrel = reloc->pcrel;
+ scatdst->r_length = reloc->length;
+ scatdst->r_type = relocator->reloc_get_pair_type(reloc->reloc_type);
+ scatdst->r_value = reloc->pair_target;
+ scatdst->r_scattered = 1;
+ break;
+ case KXLD_TARGET_SECTNUM:
+ dst->r_address = reloc->pair_address;
+ dst->r_pcrel = reloc->pcrel;
+ dst->r_length = reloc->length;
+ dst->r_type = relocator->reloc_get_pair_type(reloc->reloc_type);
+ dst->r_symbolnum = reloc->pair_target + 1;
+ dst->r_extern = 0;
+ break;
+ case KXLD_TARGET_SYMBOLNUM:
+ dst->r_address = reloc->pair_address;
+ dst->r_pcrel = reloc->pcrel;
+ dst->r_length = reloc->length;
+ dst->r_type = relocator->reloc_get_pair_type(reloc->reloc_type);
+ dst->r_symbolnum = 1;
+ dst->r_extern = 0;
+ break;
+ default:
+ rval = KERN_FAILURE;
+ goto finish;
+ }
+ ++dst;
+ }
}
-#if !KERNEL
- if (swap) instr_data = OSSwapInt32(instr_data);
-#endif
-
- *instr_addr = instr_data;
-
rval = KERN_SUCCESS;
-
finish:
+ *dstp = dst;
return rval;
}
-#endif /* KXLD_USER_OR_I386 */
+#endif /* KXLD_PIC_KEXTS */
-#if KXLD_USER_OR_PPC
+#if KXLD_USER_OR_I386
/*******************************************************************************
*******************************************************************************/
static boolean_t
-ppc_reloc_has_pair(u_int _type)
+generic_reloc_has_pair(u_int _type)
{
- enum reloc_type_ppc type = _type;
+ enum reloc_type_generic type = _type;
- switch(type) {
- case PPC_RELOC_HI16:
- case PPC_RELOC_LO16:
- case PPC_RELOC_HA16:
- case PPC_RELOC_LO14:
- case PPC_RELOC_JBSR:
- case PPC_RELOC_SECTDIFF:
- return TRUE;
- default:
- return FALSE;
- }
+ return (type == GENERIC_RELOC_SECTDIFF ||
+ type == GENERIC_RELOC_LOCAL_SECTDIFF);
}
/*******************************************************************************
*******************************************************************************/
-static boolean_t
-ppc_reloc_is_pair(u_int _type, u_int _prev_type __unused)
+static u_int
+generic_reloc_get_pair_type(u_int _prev_type __unused)
{
- enum reloc_type_ppc type = _type;
-
- return (type == PPC_RELOC_PAIR);
+ return GENERIC_RELOC_PAIR;
}
/*******************************************************************************
*******************************************************************************/
-static boolean_t ppc_reloc_has_got(u_int _type __unused)
+static boolean_t generic_reloc_has_got(u_int _type __unused)
{
return FALSE;
}
/*******************************************************************************
*******************************************************************************/
-static kern_return_t
-ppc_process_reloc(const KXLDRelocator *relocator __unused, u_char *instruction,
+static kern_return_t
+generic_process_reloc(const KXLDRelocator *relocator, u_char *instruction,
u_int length, u_int pcrel, kxld_addr_t _base_pc, kxld_addr_t _link_pc,
kxld_addr_t _link_disp __unused, u_int _type, kxld_addr_t _target,
- kxld_addr_t _pair_target __unused, boolean_t swap __unused)
+ kxld_addr_t _pair_target, boolean_t swap __unused)
{
kern_return_t rval = KERN_FAILURE;
- uint32_t *instr_addr = NULL;
- uint32_t instr_data = 0;
uint32_t base_pc = (uint32_t) _base_pc;
uint32_t link_pc = (uint32_t) _link_pc;
+ uint32_t *instr_addr = NULL;
+ uint32_t instr_data = 0;
uint32_t target = (uint32_t) _target;
uint32_t pair_target = (uint32_t) _pair_target;
- int32_t addend = 0;
- int32_t displacement = 0;
- uint32_t difference = 0;
- uint32_t br14_disp_sign = 0;
- enum reloc_type_ppc type = _type;
+ enum reloc_type_generic type = _type;
check(instruction);
- require_action(length == 2 || length == 3, finish,
- rval=KERN_FAILURE);
+ require_action(length == 2, finish, rval=KERN_FAILURE);
- if (pcrel) displacement = target + base_pc - link_pc;
+ if (pcrel) target = target + base_pc - link_pc;
- instr_addr = (uint32_t *)instruction;
+ instr_addr = (uint32_t *) ((void *) instruction);
instr_data = *instr_addr;
-
+
#if !KERNEL
if (swap) instr_data = OSSwapInt32(instr_data);
#endif
require_noerr(rval, finish);
switch (type) {
- case PPC_RELOC_VANILLA:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
+ case GENERIC_RELOC_VANILLA:
instr_data += target;
break;
- case PPC_RELOC_BR14:
- require_action(pcrel, finish, rval=KERN_FAILURE);
-
- addend = BR14D(instr_data);
- displacement += SIGN_EXTEND(addend, BR14_NBITS_DISPLACEMENT);
- difference = ABSOLUTE_VALUE(displacement);
- require_action(difference < BR14_LIMIT, finish,
- rval=KERN_FAILURE;
- kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogRelocationOverflow));
-
-
- br14_disp_sign = BIT15(instr_data);
- instr_data = BR14I(instr_data) | BR14D(displacement);
-
- /* If this is a predicted conditional branch (signified by an
- * instruction length of 3) that is not branch-always, and the sign of
- * the displacement is different after relocation, then flip the y-bit
- * to preserve the branch prediction
- */
- if ((length == 3) &&
- IS_COND_BR_INSTR(instr_data) &&
- IS_NOT_ALWAYS_TAKEN(instr_data) &&
- (BIT15(instr_data) != br14_disp_sign))
- {
- FLIP_PREDICT_BIT(instr_data);
- }
- break;
- case PPC_RELOC_BR24:
- require_action(pcrel, finish, rval=KERN_FAILURE);
-
- addend = BR24D(instr_data);
- displacement += SIGN_EXTEND(addend, BR24_NBITS_DISPLACEMENT);
- difference = ABSOLUTE_VALUE(displacement);
- require_action(difference < BR24_LIMIT, finish,
- rval=KERN_FAILURE;
- kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogRelocationOverflow));
-
- instr_data = BR24I(instr_data) | BR24D(displacement);
- break;
- case PPC_RELOC_HI16:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
- target += LO16S(instr_data) | LO16(pair_target);
- instr_data = HI16(instr_data) | HI16S(target);
- break;
- case PPC_RELOC_LO16:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
- target += LO16S(pair_target) | LO16(instr_data);
- instr_data = HI16(instr_data) | LO16(target);
- break;
- case PPC_RELOC_HA16:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
- instr_data -= BIT15(pair_target) ? 1 : 0;
- target += LO16S(instr_data) | LO16(pair_target);
- instr_data = HI16(instr_data) | HI16S(target);
- instr_data += BIT15(target) ? 1 : 0;
- break;
- case PPC_RELOC_JBSR:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
- /* The generated code as written branches to an island that loads the
- * absolute address of the target. If we can branch to the target
- * directly with less than 24 bits of displacement, we modify the branch
- * instruction to do so which avoids the cost of the island.
- */
-
- displacement = target + pair_target - link_pc;
- difference = ABSOLUTE_VALUE(displacement);
- if (difference < BR24_LIMIT) {
- instr_data = BR24I(instr_data) | BR24D(displacement);
- }
- break;
- case PPC_RELOC_SECTDIFF:
- require_action(!pcrel, finish, rval=KERN_FAILURE);
-
+ case GENERIC_RELOC_SECTDIFF:
+ case GENERIC_RELOC_LOCAL_SECTDIFF:
instr_data = instr_data + target - pair_target;
break;
- case PPC_RELOC_LO14:
- case PPC_RELOC_PB_LA_PTR:
- case PPC_RELOC_HI16_SECTDIFF:
- case PPC_RELOC_LO16_SECTDIFF:
- case PPC_RELOC_HA16_SECTDIFF:
- case PPC_RELOC_LO14_SECTDIFF:
- case PPC_RELOC_LOCAL_SECTDIFF:
+ case GENERIC_RELOC_PB_LA_PTR:
rval = KERN_FAILURE;
goto finish;
- case PPC_RELOC_PAIR:
+ case GENERIC_RELOC_PAIR:
default:
rval = KERN_FAILURE;
goto finish;
*instr_addr = instr_data;
rval = KERN_SUCCESS;
-finish:
+finish:
return rval;
}
-#endif /* KXLD_USER_OR_PPC */
+#endif /* KXLD_USER_OR_I386 */
#if KXLD_USER_OR_X86_64
/*******************************************************************************
/*******************************************************************************
*******************************************************************************/
-static boolean_t
-x86_64_reloc_is_pair(u_int _type, u_int _prev_type)
+static u_int
+x86_64_reloc_get_pair_type(u_int _prev_type __unused)
{
- enum reloc_type_x86_64 type = _type;
- enum reloc_type_x86_64 prev_type = _prev_type;
-
- return (x86_64_reloc_has_pair(prev_type) && type == X86_64_RELOC_UNSIGNED);
+ return X86_64_RELOC_UNSIGNED;
}
/*******************************************************************************
finish, rval=KERN_FAILURE);
if (length == 2) {
- instr32p = (int32_t *) instruction;
+ instr32p = (int32_t *) ((void *) instruction);
instr32 = *instr32p;
#if !KERNEL
*instr32p = instr32;
} else {
- instr64p = (uint64_t *) instruction;
+ instr64p = (uint64_t *) ((void *) instruction);
instr64 = *instr64p;
#if !KERNEL
/*******************************************************************************
*******************************************************************************/
-static boolean_t
-arm_reloc_is_pair(u_int _type, u_int _prev_type __unused)
+static u_int
+arm_reloc_get_pair_type(u_int _prev_type __unused)
{
- enum reloc_type_arm type = _type;
-
- return (type == ARM_RELOC_PAIR);
+ return ARM_RELOC_PAIR;
}
/*******************************************************************************
if (pcrel) displacement = target + base_pc - link_pc;
- instr_addr = (uint32_t *)instruction;
+ instr_addr = (uint32_t *) ((void *) instruction);
instr_data = *instr_addr;
#if !KERNEL
#endif /* KXLD_USER_OR_ARM */
+#if KXLD_USER_OR_ARM64
+/*******************************************************************************
+*******************************************************************************/
+boolean_t
+arm64_reloc_has_pair(u_int _type)
+{
+ return (_type == ARM64_RELOC_SUBTRACTOR);
+}
+
+/*******************************************************************************
+*******************************************************************************/
+u_int
+arm64_reloc_get_pair_type(u_int _prev_type __unused)
+{
+ if (_prev_type == ARM64_RELOC_SUBTRACTOR) {
+ return ARM64_RELOC_UNSIGNED;
+ } else {
+ return -1u;
+ }
+}
+
+/*******************************************************************************
+*******************************************************************************/
+boolean_t
+arm64_reloc_has_got(u_int _type)
+{
+ return (_type == ARM64_RELOC_GOT_LOAD_PAGE21 ||
+ _type == ARM64_RELOC_GOT_LOAD_PAGEOFF12);
+}
+
+/*******************************************************************************
+*******************************************************************************/
+kern_return_t
+arm64_process_reloc(const KXLDRelocator *relocator __unused, u_char *instruction,
+ u_int length, u_int pcrel, kxld_addr_t _base_pc __unused, kxld_addr_t _link_pc,
+ kxld_addr_t _link_disp __unused, u_int _type, kxld_addr_t _target,
+ kxld_addr_t _pair_target __unused, boolean_t swap)
+{
+ kern_return_t rval = KERN_FAILURE;
+ enum reloc_type_arm64 type = _type;
+ uint64_t target = _target;
+ uint64_t link_pc = (uint64_t) _link_pc;
+ uint64_t difference = 0;
+ int64_t displacement = 0;
+ uint32_t addend = 0;
+
+ check(instruction);
+ require_action((length == 2 || length == 3), finish, rval=KERN_FAILURE);
+
+ if (length == 2) {
+ uint32_t *instr32p = (uint32_t *) (void *) instruction;
+ uint32_t instr32 = *instr32p;
+
+#if !KERNEL
+ if (swap) instr32 = OSSwapInt32(instr32);
+#endif
+
+ switch (type) {
+ case ARM64_RELOC_BRANCH26:
+ require_action(pcrel, finish, rval=KERN_FAILURE);
+ addend = (instr32 & 0x03FFFFFF) << 2;
+ addend = SIGN_EXTEND(addend, 27);
+ displacement = (target - link_pc + addend);
+ difference = ABSOLUTE_VALUE(displacement);
+ displacement = (displacement >> 2);
+ require_action(difference < (128 * 1024 * 1024), finish,
+ rval = KERN_FAILURE;
+ kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogRelocationOverflow));
+ instr32 = (instr32 & 0xFC000000) | (displacement & 0x03FFFFFF);
+ break;
+
+ default:
+ rval = KERN_FAILURE;
+ goto finish;
+ }
+
+#if !KERNEL
+ if (swap) instr32 = OSSwapInt32(instr32);
+#endif
+
+ *instr32p = instr32;
+ } else { /* length == 3 */
+ uint64_t *instr64p = (uint64_t *) (void *) instruction;
+ uint64_t instr64 = *instr64p;
+
+#if !KERNEL
+ if (swap) instr64 = OSSwapInt64(instr64);
+#endif
+
+ switch (type) {
+ case ARM64_RELOC_UNSIGNED:
+ require_action(!pcrel, finish, rval=KERN_FAILURE);
+ instr64 += target;
+ break;
+ default:
+ rval = KERN_FAILURE;
+ goto finish;
+ }
+
+#if !KERNEL
+ if (swap) instr64 = OSSwapInt64(instr64);
+#endif
+
+ *instr64p = instr64;
+ }
+
+ rval = KERN_SUCCESS;
+finish:
+ return rval;
+}
+
+#endif /* KXLD_USER_OR_ARM64 */
projects / apple / xnu.git / blobdiff