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annotate src/hermes/x86_main.asm @ 3950:9d9e15ab1697 SDL-1.2

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Check if yasm supports a nasm-specific syntax we use (it doesn't in 0.5.0, which is still common in Linux distros, and does in 0.6.0). Disable it if we don't, attempting to fallback to using nasm. Thanks to Mike Frysinger for the patch. Fixes Bugzilla #393.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 04 Jun 2007 11:06:48 +0000
parents eb4d9d99849b
children 180fa05e98e2
rev   line source
0
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1 ;
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2 ; x86 format converters for HERMES
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3 ; Some routines Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at)
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4 ; This source code is licensed under the GNU LGPL
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5 ;
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6 ; Please refer to the file COPYING.LIB contained in the distribution for
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7 ; licensing conditions
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8 ;
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9 ; Most routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission
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10 ;
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11
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12 BITS 32
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13
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14 %include "common.inc"
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15
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16 SDL_FUNC _ConvertX86
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17 SDL_FUNC _x86return
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18
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19 SDL_FUNC _Hermes_X86_CPU
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20
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21 SECTION .text
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22
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23 ;; _ConvertX86:
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24 ;; [ESP+8] ConverterInfo*
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25 ;; --------------------------------------------------------------------------
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26 ;; ConverterInfo (ebp+..)
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27 ;; 0: void *s_pixels
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28 ;; 4: int s_width
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29 ;; 8: int s_height
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30 ;; 12: int s_add
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31 ;; 16: void *d_pixels
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32 ;; 20: int d_width
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33 ;; 24: int d_height
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34 ;; 28: int d_add
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35 ;; 32: void (*converter_function)()
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36 ;; 36: int32 *lookup
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37
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38 _ConvertX86:
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39 push ebp
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40 mov ebp,esp
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41
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42 ; Save the registers used by the blitters, necessary for optimized code
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43 pusha
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44
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45 mov eax,[ebp+8]
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46
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47 cmp dword [eax+4],BYTE 0
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48 je endconvert
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49
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50 mov ebp,eax
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51
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52 mov esi,[ebp+0]
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53 mov edi,[ebp+16]
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54
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55 y_loop:
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56 mov ecx,[ebp+4]
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57
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58 jmp [ebp+32]
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59
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60 _x86return:
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61 add esi,[ebp+12]
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62 add edi,[ebp+28]
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63
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64 dec dword [ebp+8]
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65 jnz y_loop
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66
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67 ; Restore the registers used by the blitters, necessary for optimized code
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68 popa
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69
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70 pop ebp
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71
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72 endconvert:
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73 ret
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74
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75
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76
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77 ;; Hermes_X86_CPU returns the CPUID flags in eax
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78
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79 _Hermes_X86_CPU:
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80 pushfd
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81 pop eax
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82
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83 mov ecx,eax
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84
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85 xor eax,040000h
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86 push eax
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87
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88 popfd
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89 pushfd
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90
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91 pop eax
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92 xor eax,ecx
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93 jz .L1 ; Processor is 386
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94
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95 push ecx
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96 popfd
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97
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98 mov eax,ecx
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99 xor eax,200000h
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100
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101 push eax
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102 popfd
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103 pushfd
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104
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105 pop eax
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106 xor eax,ecx
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107 je .L1
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108
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109 push ebx
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110
0
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111 mov eax,1
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112 cpuid
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113 mov eax,edx
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114
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115 pop ebx
0
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116
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117 .L1:
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118 ret
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119
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120 %ifidn __OUTPUT_FORMAT__,elf
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121 section .note.GNU-stack noalloc noexec nowrite progbits
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122 %endif