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/*

 * 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

/*

 * Get a pointer to the argv array.  On many platforms this can be just

 * the address if the first argument, on other platforms we need to

 * do something a little more subtle here.

 */

#define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long*) ARGS)+1)

/*

 * 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 is a macro to perform a relocation.  This is only used when

 * bootstrapping the dynamic loader.  RELP is the relocation that we

 * are performing, REL is the pointer to the address we are relocating.

 * SYMBOL is the symbol involved in the relocation, and LOAD is the

 * load address.

 */

// finaladdr = LOAD ?

#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \

        {int type=ELF32_R_TYPE((RELP)->r_info);         \

        if(type==R_PPC_NONE){                           \

        }else if(type==R_PPC_ADDR32){                   \

                *REL += (SYMBOL);                       \

        }else if(type==R_PPC_RELATIVE){                 \

                *REL = (Elf32_Word)(LOAD) + (RELP)->r_addend;           \

        }else if(type==R_PPC_REL24){                    \

                Elf32_Sword delta = (Elf32_Word)(SYMBOL) - (Elf32_Word)(REL);   \

                *REL &= 0xfc000003;                     \

                *REL |= (delta & 0x03fffffc);           \

        }else if(type==R_PPC_JMP_SLOT){                 \

                Elf32_Sword delta = (Elf32_Word)(SYMBOL) - (Elf32_Word)(REL);   \

                /*if (delta << 6 >> 6 != delta)_dl_exit(99);*/  \

                *REL = OPCODE_B(delta);                 \

        }else{                                          \

          _dl_exit(100+ELF32_R_TYPE((RELP)->r_info));   \

        }                                               \

        if(type!=R_PPC_NONE){                           \

                PPC_DCBST(REL); PPC_SYNC; PPC_ICBI(REL);\

        }                                               \

        }

/*

 * Transfer control to the user's application, once the dynamic loader

 * is done.  This routine has to exit the current function, then

 * call the _dl_elf_main function.

 */

/* hgb@ifi.uio.no:

 * Adding a clobber list consisting of r0 for %1.  addi on PowerPC

 * takes a register as the second argument, but if the register is

 * r0, the value 0 is used instead.  If r0 is used here, the stack

 * pointer (r1) will be zeroed, and the dynamically linked

 * application will seg.fault immediatly when receiving control.

 */

#define START()         \

        __asm__ volatile ( \

                    "addi 1,%1,0\n\t" \

                    "mtlr %0\n\t" \

                    "blrl\n\t"  \

                    : : "r" (_dl_elf_main), "r" (args) \

                    : "r0")

/* 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