added Josh's dynamic display assembly generator
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@@ -1,4 +1,4 @@
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/* $Id: glapi.c,v 1.29 2000/01/28 20:17:42 brianp Exp $ */
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/* $Id: glapi.c,v 1.30 2000/01/31 22:51:44 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@@ -299,13 +299,51 @@ static GLuint NumExtEntryPoints = 0;
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/*
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* Generate a dispatch function (entrypoint) which jumps through
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* the given slot number (offset) in the current dispatch table.
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* We need assembly language in order to accomplish this.
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*/
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static void *
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generate_entrypoint(GLuint offset)
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{
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/* XXX need to generate some assembly code here */
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#if defined(USE_X86_ASM)
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/*
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* This x86 code contributed by Josh Vanderhoof.
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*
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* 0: a1 10 32 54 76 movl __glapi_Dispatch,%eax
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* 00 01 02 03 04
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* 5: 85 c0 testl %eax,%eax
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* 05 06
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* 7: 74 06 je f <entrypoint+0xf>
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* 07 08
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* 9: ff a0 10 32 54 76 jmp *0x76543210(%eax)
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* 09 0a 0b 0c 0d 0e
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* f: e8 fc ff ff ff call __glapi_get_dispatch
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* 0f 10 11 12 13
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* 14: ff a0 10 32 54 76 jmp *0x76543210(%eax)
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* 14 15 16 17 18 19
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*/
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static const unsigned char temp[] = {
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0xa1, 0x00, 0x00, 0x00, 0x00,
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0x85, 0xc0,
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0x74, 0x06,
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0xff, 0xa0, 0x00, 0x00, 0x00, 0x00,
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0xe8, 0x00, 0x00, 0x00, 0x00,
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0xff, 0xa0, 0x00, 0x00, 0x00, 0x00
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};
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unsigned char *code = malloc(sizeof(temp));
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unsigned int next_insn;
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if (code) {
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memcpy(code, temp, sizeof(temp));
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*(unsigned int *)(code + 0x01) = (unsigned int)&_glapi_Dispatch;
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*(unsigned int *)(code + 0x0b) = (unsigned int)functionOffset * 4;
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next_insn = (unsigned int)(code + 0x14);
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*(unsigned int *)(code + 0x10) = (unsigned int)_glapi_get_dispatch - next_insn;
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*(unsigned int *)(code + 0x16) = (unsigned int)functionOffset * 4;
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}
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return code;
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#else
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return NULL;
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#endif
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}
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