uclibc-ng/ldso/ldso/powerpc/dl-sysdep.h

/*
 * Various assmbly language/system dependent  hacks that are required
 * so that we can minimize the amount of platform specific code.
 */

/*
 * Define this if the system uses RELOCA.
 */
#define ELF_USES_RELOCA

/*
 * Initialization sequence for a GOT.
 */
#define INIT_GOT(GOT_BASE,MODULE)  _dl_init_got(GOT_BASE,MODULE)

/* Stuff for the PLT.  */
#define PLT_INITIAL_ENTRY_WORDS 18
#define PLT_LONGBRANCH_ENTRY_WORDS 0
#define PLT_TRAMPOLINE_ENTRY_WORDS 6
#define PLT_DOUBLE_SIZE (1<<13)
#define PLT_ENTRY_START_WORDS(entry_number) \
  (PLT_INITIAL_ENTRY_WORDS + (entry_number)*2				\
   + ((entry_number) > PLT_DOUBLE_SIZE					\
      ? ((entry_number) - PLT_DOUBLE_SIZE)*2				\
      : 0))
#define PLT_DATA_START_WORDS(num_entries) PLT_ENTRY_START_WORDS(num_entries)

/* Macros to build PowerPC opcode words.  */
#define OPCODE_ADDI(rd,ra,simm) \
  (0x38000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
#define OPCODE_ADDIS(rd,ra,simm) \
  (0x3c000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
#define OPCODE_ADD(rd,ra,rb) \
  (0x7c000214 | (rd) << 21 | (ra) << 16 | (rb) << 11)
#define OPCODE_B(target) (0x48000000 | ((target) & 0x03fffffc))
#define OPCODE_BA(target) (0x48000002 | ((target) & 0x03fffffc))
#define OPCODE_BCTR() 0x4e800420
#define OPCODE_LWZ(rd,d,ra) \
  (0x80000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
#define OPCODE_LWZU(rd,d,ra) \
  (0x84000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
#define OPCODE_MTCTR(rd) (0x7C0903A6 | (rd) << 21)
#define OPCODE_RLWINM(ra,rs,sh,mb,me) \
  (0x54000000 | (rs) << 21 | (ra) << 16 | (sh) << 11 | (mb) << 6 | (me) << 1)

#define OPCODE_LI(rd,simm)    OPCODE_ADDI(rd,0,simm)
#define OPCODE_ADDIS_HI(rd,ra,value) \
  OPCODE_ADDIS(rd,ra,((value) + 0x8000) >> 16)
#define OPCODE_LIS_HI(rd,value) OPCODE_ADDIS_HI(rd,0,value)
#define OPCODE_SLWI(ra,rs,sh) OPCODE_RLWINM(ra,rs,sh,0,31-sh)


#define PPC_DCBST(where) asm volatile ("dcbst 0,%0" : : "r"(where) : "memory")
#define PPC_SYNC asm volatile ("sync" : : : "memory")
#define PPC_ISYNC asm volatile ("sync; isync" : : : "memory")
#define PPC_ICBI(where) asm volatile ("icbi 0,%0" : : "r"(where) : "memory")
#define PPC_DIE asm volatile ("tweq 0,0")

/* Here we define the magic numbers that this dynamic loader should accept */

#define MAGIC1 EM_PPC
#undef  MAGIC2
/* Used for error messages */
#define ELF_TARGET "powerpc"

struct elf_resolve;
extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
void _dl_init_got(unsigned long *lpnt,struct elf_resolve *tpnt);


#define do_rem(result, n, base) ((result) = (n) % (base))

/* 4096 bytes alignment */
#define PAGE_ALIGN 0xfffff000
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000

/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
   PLT entries 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.  */
/* We never want to use a PLT entry as the destination of a
   reloc, when what is being relocated is a branch. This is
   partly for efficiency, but mostly so we avoid loops.  */
#define elf_machine_type_class(type) \
  ((((type) == R_PPC_JMP_SLOT				\
    || (type) == R_PPC_REL24				\
    || (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT)	\
   | (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY))

/* The SVR4 ABI specifies that the JMPREL relocs must be inside the
   DT_RELA table.  */
#define ELF_MACHINE_PLTREL_OVERLAP 1