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comparison src/video/SDL_stretch.c @ 4108:3feb94233f90 SDL-1.2

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Fixed bug #528 OpenBSD (and possibly others) do not have executable memory by default, so use mprotect() to allow execution of dynamic assembly block.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 03:50:29 +0000
parents b5a4ac87b98c
children cd2ab40f1219
comparison
equal deleted inserted replaced
4107:4e3b250c950e 4108:3feb94233f90
39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES 39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES
40 #define USE_ASM_STRETCH 40 #define USE_ASM_STRETCH
41 #endif 41 #endif
42 42
43 #ifdef USE_ASM_STRETCH 43 #ifdef USE_ASM_STRETCH
44
45 /* OpenBSD has non-executable memory by default, so use mprotect() */
46 #ifdef __OpenBSD__
47 #define USE_MPROTECT
48 #endif
49 #ifdef USE_MPROTECT
50 #include <sys/types.h>
51 #include <sys/mman.h>
52 #endif
44 53
45 #if defined(_M_IX86) || defined(i386) 54 #if defined(_M_IX86) || defined(i386)
46 #define PREFIX16 0x66 55 #define PREFIX16 0x66
47 #define STORE_BYTE 0xAA 56 #define STORE_BYTE 0xAA
48 #define STORE_WORD 0xAB 57 #define STORE_WORD 0xAB
89 break; 98 break;
90 default: 99 default:
91 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp); 100 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
92 return(-1); 101 return(-1);
93 } 102 }
103 #ifdef USE_MPROTECT
104 mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_WRITE|PROT_EXEC);
105 #endif
94 pos = 0x10000; 106 pos = 0x10000;
95 inc = (src_w << 16) / dst_w; 107 inc = (src_w << 16) / dst_w;
96 eip = copy_row; 108 eip = copy_row;
97 for ( i=0; i<dst_w; ++i ) { 109 for ( i=0; i<dst_w; ++i ) {
98 while ( pos >= 0x10000L ) { 110 while ( pos >= 0x10000L ) {