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sysdep.h

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

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

/*
 * Get the address of the Global offset table.  This must be absolute, not
 * relative.
 */
#define GET_GOT(X)     __asm__("\tmov %%l7,%0\n\t" : "=r" (X))

/*
 * 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.  We assume that argc is stored
 * at the word just below the argvp that we return here.
 */
#define GET_ARGV(ARGVP, ARGS) __asm__("\tadd %%fp,68,%0\n" : "=r" (ARGVP));

/*
 * Initialization sequence for a GOT.  For the Sparc, this points to the
 * PLT, and we need to initialize a couple of the slots.  The PLT should
 * look like:
 *
 *          save %sp, -64, %sp
 *          call _dl_linux_resolve
 *          nop
 *          .word implementation_dependent
 */
#define INIT_GOT(GOT_BASE,MODULE) \
{                       \
   GOT_BASE[0] = 0x9de3bfc0;  /* save %sp, -64, %sp */      \
   GOT_BASE[1] = 0x40000000 | (((unsigned int) _dl_linux_resolve - (unsigned int) GOT_BASE - 4) >> 2);      \
   GOT_BASE[2] = 0x01000000; /* nop */                \
   GOT_BASE[3] = (int) MODULE;                              \
}

/*
 * Here is a macro to perform a relocation.  This is only used when
 * bootstrapping the dynamic loader.
 */
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD) \
      switch(ELF32_R_TYPE((RELP)->r_info)) {          \
      case R_SPARC_32:                    \
        *REL = SYMBOL + (RELP)->r_addend;       \
        break;                            \
      case R_SPARC_GLOB_DAT:                    \
        *REL = SYMBOL + (RELP)->r_addend;       \
        break;                            \
      case R_SPARC_JMP_SLOT:                    \
        REL[1] = 0x03000000 | ((SYMBOL >> 10) & 0x3fffff);  \
        REL[2] = 0x81c06000 | (SYMBOL & 0x3ff); \
        break;                            \
      case R_SPARC_NONE:                        \
        break;                            \
        case R_SPARC_WDISP30:                   \
          break;                                        \
      case R_SPARC_RELATIVE:                    \
        *REL += (unsigned int) LOAD + (RELP)->r_addend; \
        break;                            \
      default:                            \
        _dl_exit(1);                            \
      }


/*
 * Transfer control to the user's application, once the dynamic loader
 * is done.  The crt calls atexit with $g1 if not null, so we need to
 * ensure that it contains NULL.
 */

#define START()         \
      __asm__ volatile ( \
                         "add %%g0,%%g0,%%g1\n\t" \
                     "jmpl %0, %%o7\n\t"  \
                     "restore %%g0,%%g0,%%g0\n\t" \
                  : /*"=r" (status) */ :  \
                    "r" (_dl_elf_main): "g1", "o0", "o1")



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

#define MAGIC1 EM_SPARC
#undef  MAGIC2
/* Used for error messages */
#define ELF_TARGET "Sparc"

#ifndef COMPILE_ASM
extern unsigned int _dl_linux_resolver(unsigned int reloc_entry,
                              unsigned int * i);
#endif

/*
 * Define this if you want a dynamic loader that works on Solaris.
 */
#define SOLARIS_COMPATIBLE

/*
 * Define this because we do not want to call .udiv in the library.
 * Change on the plans -miguel:
 * We just statically link against .udiv.  This is required
 * if we want to be able to run on Sun4c machines.
 */

/* #define do_div(n,base) ({ \ */
/* volatile int __res; \ */
/* __asm__("mov %%g0,%%Y\n\t" \ */
/*    "sdiv %2,%3,%0\n\t" \ */
/*     :"=r" (n),"=r" (__res):"r" (n),"r"(base)); __res; }) */

/* We now link .urem against this one */
#ifdef USE_V8
#define do_rem(result,n,base) ({ \
volatile int __res; \
__asm__("mov %%g0,%%Y\n\t" \
      "sdiv %2,%3,%%l6\n\t" \
       "smul %%l6,%3,%%l6\n\t" \
       "sub  %2,%%l6,%0\n\t" \
       :"=r" (result),"=r" (__res):"r" (n),"r"(base) : "l6" ); __res; })
#else
#define do_rem(a,b,c) a = _dl_urem (b,c);
#endif
/*
 * dbx wants the binder to have a specific name.  Mustn't disappoint it.
 */
#ifdef SOLARIS_COMPATIBLE
#define _dl_linux_resolve _elf_rtbndr
#endif


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