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/*

 * Mesa 3-D graphics library

 * Version:  7.1

 *

 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

/**

 * \file glapi_entrypoint.c

 *

 * Arch-specific code for manipulating GL API entrypoints (dispatch stubs).

 */

#include "glapi/glapi_priv.h"

#include "mapi/u_execmem.h"

#ifdef USE_X86_ASM

#if defined( GLX_USE_TLS )

extern       GLubyte gl_dispatch_functions_start[];

extern       GLubyte gl_dispatch_functions_end[];

#else

extern const GLubyte gl_dispatch_functions_start[];

#endif

#endif /* USE_X86_ASM */

#if defined(DISPATCH_FUNCTION_SIZE)

_glapi_proc

get_entrypoint_address(unsigned int functionOffset)

{

   return (_glapi_proc) (gl_dispatch_functions_start

                         + (DISPATCH_FUNCTION_SIZE * functionOffset));

}

#endif

#if defined(USE_X86_ASM)

/**

 * Perform platform-specific GL API entry-point fixups.

 */

static void

init_glapi_relocs( void )

{

#if defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)

    extern unsigned long _x86_get_dispatch(void);

    char run_time_patch[] = {

       0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */

    };

    GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */

    const GLubyte * const get_disp = (const GLubyte *) run_time_patch;

    GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;

    *offset = _x86_get_dispatch();

    while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {

	(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));

	curr_func += DISPATCH_FUNCTION_SIZE;

    }

#endif

}

/**

 * Generate a dispatch function (entrypoint) which jumps through

 * the given slot number (offset) in the current dispatch table.

 * We need assembly language in order to accomplish this.

 */

_glapi_proc

generate_entrypoint(unsigned int functionOffset)

{

   /* 32 is chosen as something of a magic offset.  For x86, the dispatch

    * at offset 32 is the first one where the offset in the

    * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.

    */

   const GLubyte * const template_func = gl_dispatch_functions_start

     + (DISPATCH_FUNCTION_SIZE * 32);

   GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE);

   if ( code != NULL ) {

      (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);

      fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );

   }

   return (_glapi_proc) code;

}

/**

 * This function inserts a new dispatch offset into the assembly language

 * stub that was generated with the preceeding function.

 */

void

fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset)

{

   GLubyte * const code = (GLubyte *) entrypoint;

#if defined(GLX_USE_TLS)

   *((unsigned int *)(code +  8)) = 4 * offset;

#elif defined(THREADS)

   *((unsigned int *)(code + 11)) = 4 * offset;

   *((unsigned int *)(code + 22)) = 4 * offset;

#else

   *((unsigned int *)(code +  7)) = 4 * offset;

#endif

}

#elif defined(USE_SPARC_ASM)

extern void __glapi_sparc_icache_flush(unsigned int *);

static void

init_glapi_relocs( void )

{

#if defined(PTHREADS) || defined(GLX_USE_TLS)

    static const unsigned int template[] = {

#ifdef GLX_USE_TLS

	0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */

	0x8730e00a, /* srl %g3, 10, %g3 */

	0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */

#ifdef __arch64__

	0xc259c002, /* ldx [%g7 + %g2], %g1 */

	0xc2584003, /* ldx [%g1 + %g3], %g1 */

#else

	0xc201c002, /* ld [%g7 + %g2], %g1 */

	0xc2004003, /* ld [%g1 + %g3], %g1 */

#endif

	0x81c04000, /* jmp %g1 */

	0x01000000, /* nop  */

#else

#ifdef __arch64__

	0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */

	0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */

	0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */

	0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */

	0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */

	0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */

	0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */

#else

	0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */

	0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */

	0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */

#endif

	0x80a06000, /*             --> cmp %g1, 0 */

	0x02800005, /*             --> be +4*5 */

	0x01000000, /*             -->  nop  */

#ifdef __arch64__

	0xc2584003, /* 64-bit      --> ldx [%g1 + %g3], %g1 */

#else

	0xc2004003, /* 32-bit      --> ld [%g1 + %g3], %g1 */

#endif

	0x81c04000, /*             --> jmp %g1 */

	0x01000000, /*             --> nop  */

#ifdef __arch64__

	0x9de3bf80, /* 64-bit      --> save  %sp, -128, %sp */

#else

	0x9de3bfc0, /* 32-bit      --> save  %sp, -64, %sp */

#endif

	0xa0100003, /*             --> mov  %g3, %l0 */

	0x40000000, /*             --> call _glapi_get_dispatch */

	0x01000000, /*             -->  nop */

	0x82100008, /*             --> mov %o0, %g1 */

	0x86100010, /*             --> mov %l0, %g3 */

	0x10bffff7, /*             --> ba -4*9 */

	0x81e80000, /*             -->  restore  */

#endif

    };

#ifdef GLX_USE_TLS

    extern unsigned int __glapi_sparc_tls_stub;

    extern unsigned long __glapi_sparc_get_dispatch(void);

    unsigned int *code = &__glapi_sparc_tls_stub;

    unsigned long dispatch = __glapi_sparc_get_dispatch();

#else

    extern unsigned int __glapi_sparc_pthread_stub;

    unsigned int *code = &__glapi_sparc_pthread_stub;

    unsigned long dispatch = (unsigned long) &_glapi_Dispatch;

    unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch;

    int idx;

#endif

#ifdef GLX_USE_TLS

    code[0] = template[0] | (dispatch >> 10);

    code[1] = template[1];

    __glapi_sparc_icache_flush(&code[0]);

    code[2] = template[2] | (dispatch & 0x3ff);

    code[3] = template[3];

    __glapi_sparc_icache_flush(&code[2]);

    code[4] = template[4];

    code[5] = template[5];

    __glapi_sparc_icache_flush(&code[4]);

    code[6] = template[6];

    __glapi_sparc_icache_flush(&code[6]);

#else

#if defined(__arch64__)

    code[0] = template[0] | (dispatch >> (32 + 10));

    code[1] = template[1] | ((dispatch & 0xffffffff) >> 10);

    __glapi_sparc_icache_flush(&code[0]);

    code[2] = template[2] | ((dispatch >> 32) & 0x3ff);

    code[3] = template[3];

    __glapi_sparc_icache_flush(&code[2]);

    code[4] = template[4];

    code[5] = template[5];

    __glapi_sparc_icache_flush(&code[4]);

    code[6] = template[6] | (dispatch & 0x3ff);

    idx = 7;

#else

    code[0] = template[0] | (dispatch >> 10);

    code[1] = template[1];

    __glapi_sparc_icache_flush(&code[0]);

    code[2] = template[2] | (dispatch & 0x3ff);

    idx = 3;

#endif

    code[idx + 0] = template[idx + 0];

    __glapi_sparc_icache_flush(&code[idx - 1]);

    code[idx + 1] = template[idx + 1];

    code[idx + 2] = template[idx + 2];

    __glapi_sparc_icache_flush(&code[idx + 1]);

    code[idx + 3] = template[idx + 3];

    code[idx + 4] = template[idx + 4];

    __glapi_sparc_icache_flush(&code[idx + 3]);

    code[idx + 5] = template[idx + 5];

    code[idx + 6] = template[idx + 6];

    __glapi_sparc_icache_flush(&code[idx + 5]);

    code[idx + 7] = template[idx + 7];

    code[idx + 8] = template[idx + 8] |

	    (((call_dest - ((unsigned long) &code[idx + 8]))

	      >> 2) & 0x3fffffff);

    __glapi_sparc_icache_flush(&code[idx + 7]);

    code[idx + 9] = template[idx + 9];

    code[idx + 10] = template[idx + 10];

    __glapi_sparc_icache_flush(&code[idx + 9]);

    code[idx + 11] = template[idx + 11];

    code[idx + 12] = template[idx + 12];

    __glapi_sparc_icache_flush(&code[idx + 11]);

    code[idx + 13] = template[idx + 13];

    __glapi_sparc_icache_flush(&code[idx + 13]);

#endif

#endif

}

_glapi_proc

generate_entrypoint(GLuint functionOffset)

{

#if defined(PTHREADS) || defined(GLX_USE_TLS)

   static const unsigned int template[] = {

      0x07000000, /* sethi %hi(0), %g3 */

      0x8210000f, /* mov  %o7, %g1 */

      0x40000000, /* call */

      0x9e100001, /* mov  %g1, %o7 */

   };

#ifdef GLX_USE_TLS

   extern unsigned int __glapi_sparc_tls_stub;

   unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub;

#else

   extern unsigned int __glapi_sparc_pthread_stub;

   unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub;

#endif

   unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template));

   if (code) {

      code[0] = template[0] | (functionOffset & 0x3fffff);

      code[1] = template[1];

      __glapi_sparc_icache_flush(&code[0]);

      code[2] = template[2] |

         (((call_dest - ((unsigned long) &code[2]))

	   >> 2) & 0x3fffffff);

      code[3] = template[3];

      __glapi_sparc_icache_flush(&code[2]);

   }

   return (_glapi_proc) code;

#endif

}

void

fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)

{

   unsigned int *code = (unsigned int *) entrypoint;

   code[0] &= ~0x3fffff;

   code[0] |= (offset * sizeof(void *)) & 0x3fffff;

   __glapi_sparc_icache_flush(&code[0]);

}

#else /* USE_*_ASM */

static void

init_glapi_relocs( void )

{

}

_glapi_proc

generate_entrypoint(GLuint functionOffset)

{

   (void) functionOffset;

   return NULL;

}

void

fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)

{

   /* an unimplemented architecture */

   (void) entrypoint;

   (void) offset;

}

#endif /* USE_*_ASM */

void

init_glapi_relocs_once( void )

{

#if defined(PTHREADS) || defined(GLX_USE_TLS)

   static pthread_once_t once_control = PTHREAD_ONCE_INIT;

   pthread_once( & once_control, init_glapi_relocs );

#endif

}