Mercurial > sdl-ios-xcode
annotate src/thread/linux/clone.S @ 1057:e9d23bb80140
Date: Mon, 02 May 2005 04:23:16 -0500
From: Jonathan Atkins
Subject: Re: [PATCH] *CRITICAL* 8bit direct RGB palette not being created
I think that SDL_AllocFormat should create the palette for all 8bit
surfaces. And when the RGBAmasks match the normal 3:3:2:0 we need to
apply the old behavior. If the mask doesn't match that, then we need
to make the right palette assuming the masks are valid (I don't think
we validate any masks for high color surfaces...so we wouldn't here)
Then there's always a palette available for the 8bit surfaces.
This restores the normal behavior and allows for masks to create
palettes automatically for odd masks even, which would be a neato
thing to have in there, as SDL never did this before.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 16 May 2005 05:34:58 +0000 |
| parents | 974ba6ae0fa3 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* Taken with thanks from LinuxThreads 0.6 */ | |
| 3 | |
|
1035
974ba6ae0fa3
Date: Wed, 26 Jan 2005 13:37:09 GMT
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
4 /* This is no longer necessary with glibc-2.1, which has its own clone() */ |
| 0 | 5 #ifdef linux |
| 6 /* Look to see if glibc is available, and if so, what version */ | |
| 7 #include <features.h> | |
| 8 | |
| 9 #if (__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1)) | |
| 10 #define HAVE_CLONE | |
| 11 #endif /* glibc 2.1 or newer */ | |
| 12 #endif /* linux */ | |
| 13 | |
| 14 #if defined(linux) && !defined(SDL_USE_PTHREADS) && !defined(HAVE_CLONE) | |
| 15 | |
| 16 #if defined(__i386__) | |
| 17 /************************************************************************/ | |
| 18 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. | |
| 19 Contributed by Richard Henderson (rth@tamu.edu) | |
| 20 | |
| 21 The GNU C Library is free software; you can redistribute it and/or | |
| 22 modify it under the terms of the GNU Library General Public License as | |
| 23 published by the Free Software Foundation; either version 2 of the | |
| 24 License, or (at your option) any later version. | |
| 25 | |
| 26 The GNU C Library is distributed in the hope that it will be useful, | |
| 27 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 28 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 29 Library General Public License for more details. | |
| 30 | |
| 31 You should have received a copy of the GNU Library General Public | |
| 32 License along with the GNU C Library; see the file COPYING.LIB. If | |
| 33 not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 34 | |
| 35 #ifdef SAVE_RCSID | |
| 36 static char rcsid = | |
| 37 "@(#) $Id$"; | |
| 38 #endif | |
| 39 Cambridge, MA 02139, USA. */ | |
| 40 | |
| 41 /* clone() is even more special than fork() as it mucks with stacks | |
| 42 and invokes a function in the right context after its all over. */ | |
| 43 | |
| 44 #include <asm/errno.h> | |
| 45 #include <asm/unistd.h> | |
| 46 | |
| 47 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ | |
| 48 | |
| 49 .text | |
| 50 .align 4 | |
| 51 .globl __clone | |
| 52 .type __clone,@function | |
| 53 .weak clone | |
| 54 clone = __clone | |
| 55 __clone: | |
| 56 /* Sanity check arguments. */ | |
| 57 movl $-EINVAL,%eax | |
| 58 movl 4(%esp),%ecx /* no NULL function pointers */ | |
| 59 testl %ecx,%ecx | |
| 60 jz syscall_error | |
| 61 movl 8(%esp),%ecx /* no NULL stack pointers */ | |
| 62 testl %ecx,%ecx | |
| 63 jz syscall_error | |
| 64 | |
| 65 /* Insert the argument onto the new stack. */ | |
| 66 subl $8,%ecx | |
| 67 movl 16(%esp),%eax | |
| 68 movl %eax,4(%ecx) | |
| 69 | |
| 70 /* Save the function pointer as the zeroth argument. */ | |
| 71 /* It will be popped off in the child in the ebx frobbing below. */ | |
| 72 movl 4(%esp),%eax | |
| 73 movl %eax,0(%ecx) | |
| 74 | |
| 75 /* Do the system call */ | |
| 76 pushl %ebx | |
| 77 movl 16(%esp),%ebx | |
| 78 movl $__NR_clone,%eax | |
| 79 int $0x80 | |
| 80 popl %ebx | |
| 81 | |
| 82 test %eax,%eax | |
| 83 jl syscall_error | |
| 84 jz thread_start | |
| 85 | |
| 86 ret | |
| 87 | |
| 88 syscall_error: | |
| 89 negl %eax | |
| 90 pushl %eax | |
| 91 #ifdef __PIC__ | |
| 92 call __errno_location@PLT | |
| 93 #else | |
| 94 call __errno_location | |
| 95 #endif | |
| 96 popl 0(%eax) | |
| 97 movl $-1, %eax | |
| 98 ret | |
| 99 | |
| 100 thread_start: | |
| 101 subl %ebp,%ebp /* terminate the stack frame */ | |
| 102 call *%ebx | |
| 103 pushl %eax | |
| 104 #ifdef __PIC__ | |
| 105 call _exit@PLT | |
| 106 #else | |
| 107 call _exit | |
| 108 #endif | |
| 109 /************************************************************************/ | |
| 110 #elif defined(sparc) | |
| 111 /************************************************************************/ | |
| 112 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. | |
| 113 Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx) | |
| 114 Based on code written for the Intel by Richard | |
| 115 Henderson (rth@tamu.edu) | |
| 116 | |
| 117 The GNU C Library is free software; you can redistribute it and/or | |
| 118 modify it under the terms of the GNU Library General Public License as | |
| 119 published by the Free Software Foundation; either version 2 of the | |
| 120 License, or (at your option) any later version. | |
| 121 | |
| 122 The GNU C Library is distributed in the hope that it will be useful, | |
| 123 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 124 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 125 Library General Public License for more details. | |
| 126 | |
| 127 You should have received a copy of the GNU Library General Public | |
| 128 License along with the GNU C Library; see the file COPYING.LIB. If | |
| 129 not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 130 Cambridge, MA 02139, USA. */ | |
| 131 | |
| 132 /* clone() is even more special than fork() as it mucks with stacks | |
| 133 and invokes a function in the right context after its all over. */ | |
| 134 | |
| 135 #include <asm/errno.h> | |
| 136 #include <asm/unistd.h> | |
| 137 | |
| 138 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ | |
| 139 | |
| 140 .text | |
| 141 .align 4 | |
| 142 .globl __clone | |
| 143 .type __clone,@function | |
| 144 .weak clone | |
| 145 clone = __clone | |
| 146 __clone: | |
| 147 save %sp,-96,%sp | |
| 148 /* sanity check arguments */ | |
| 149 tst %i0 | |
| 150 be __clone_syscall_error | |
| 151 tst %i1 | |
| 152 be __clone_syscall_error | |
| 153 nop | |
| 154 | |
| 155 /* Do the system call */ | |
| 156 mov %i1,%o1 | |
| 157 mov %i2,%o0 | |
| 158 set __NR_clone,%g1 | |
| 159 ta 0x10 | |
| 160 bcs __clone_syscall_error | |
| 161 tst %o1 | |
| 162 bne __thread_start | |
| 163 nop | |
| 164 mov %o0,%i0 | |
| 165 ret | |
| 166 restore | |
| 167 | |
| 168 __clone_syscall_error: | |
| 169 call __errno_location | |
| 170 set EINVAL,%i0 | |
| 171 st %i0,[%o0] | |
| 172 mov -1,%i0 | |
| 173 ret | |
| 174 restore | |
| 175 | |
| 176 __thread_start: | |
| 177 call %i0 | |
| 178 mov %i3,%o0 | |
| 179 call _exit,0 | |
| 180 nop | |
| 181 /************************************************************************/ | |
| 182 #else | |
| 183 #error "Unknown Linux architecture" | |
| 184 #endif | |
| 185 | |
| 186 #endif /* Linux && ! SDL_USE_PTHREADS */ |