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/*
* Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd.
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
* in this tarball.
*/
/* Define this if the system uses RELOCA. */
#define ELF_USES_RELOCA
#include <elf.h>
/* Initialization sequence for the GOT. */
#define INIT_GOT(GOT_BASE,MODULE) \
do { \
GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
GOT_BASE[1] = (unsigned long) MODULE; \
} while(0)
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_MCORE
#define MAGIC2 EM_CSKY
/* Used for error messages */
#define ELF_TARGET "csky"
struct elf_resolve;
extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
/* 65536 bytes alignment */
#define PAGE_ALIGN 0xfffff000 /* need modify */
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
TLS variable, so undefined references should not be allowed to
define the value.
ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
of the main executable's symbols, as for a COPY reloc. */
#define elf_machine_type_class(type) \
((((type) == R_CKCORE_JUMP_SLOT || (type) == R_CKCORE_TLS_DTPMOD32 \
|| (type) == R_CKCORE_TLS_DTPOFF32 || (type) == R_CKCORE_TLS_TPOFF32) \
* ELF_RTYPE_CLASS_PLT) \
| (((type) == R_CKCORE_COPY) * ELF_RTYPE_CLASS_COPY))
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
first element of the GOT. This must be inlined in a function which
uses global data. */
static __inline__ Elf32_Addr elf_machine_dynamic (void) attribute_unused;
static __inline__ Elf32_Addr
elf_machine_dynamic (void)
{
register Elf32_Addr *got __asm__ ("gb"); /* need modify */
return *got;
}
/* this funtion will be called only when the auxvt[AT_BASE].a_un.a_val == 0
so it normal not be called, we should define a default address of the interprrter load */
static __inline__ Elf32_Addr elf_machine_load_address (void) attribute_unused;
static __inline__ Elf32_Addr
elf_machine_load_address (void)
{
#ifdef __CSKYABIV2__
extern Elf32_Addr internal_function __dl_start (void *) __asm__ ("_dl_start");
Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
Elf32_Addr pcrel_addr;
__asm__ ("grs %0,_dl_start\n" : "=r" (pcrel_addr));
#else
extern Elf32_Addr internal_function __start_flag (void *) __asm__ ("start_flag");
Elf32_Addr got_addr = (Elf32_Addr) &__start_flag;
Elf32_Addr pcrel_addr;
__asm__ ("subi sp,8\n" \
"stw lr,(sp,0)\n" \
"bsr start_flag\n" \
"start_flag:" \
"mov %0, lr\n" \
"ldw lr,(sp,0)\n" \
"addi sp,8\n" \
: "=r" (pcrel_addr));
#endif
return pcrel_addr - got_addr;
}
/* some relocation information are machine special */
static __inline__ void
elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
Elf32_Word relative_count)
{
Elf32_Rela *rpnt = (void *) rel_addr;
--rpnt;
do {
Elf32_Addr *reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
*reloc_addr = load_off + rpnt->r_addend;
} while (--relative_count); /* maybe need modify */
}
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