libs/wine/port.c

   1 /*
   2  * Wine portability routines
   3  *
   4  * Copyright 2000 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/types.h>
  27
  28 #include "wine/unicode.h"
  29 #include "wine/library.h"
  30
  31 /* functions from libwine_port that are also exported from libwine for backwards compatibility,
  32  * on platforms that require it */
  33 #ifndef __ANDROID__
  34 const void *libwine_port_functions[] =
  35 {
  36     wine_cp_enum_table,
  37     wine_cp_get_table,
  38     wine_cp_mbstowcs,
  39     wine_cp_wcstombs,
  40     wine_cpsymbol_mbstowcs,
  41     wine_cpsymbol_wcstombs,
  42     wine_fold_string,
  43     wine_utf8_mbstowcs,
  44     wine_utf8_wcstombs
  45 };
  46 #endif
  47
  48 /* no longer used, for backwards compatibility only */
  49 struct wine_pthread_functions;
  50 static void *pthread_functions[8];
  51
  52 /***********************************************************************
  53  *           wine_pthread_get_functions
  54  */
  55 void wine_pthread_get_functions( struct wine_pthread_functions *functions, size_t size )
  56 {
  57     memcpy( functions, &pthread_functions, min( size, sizeof(pthread_functions) ));
  58 }
  59
  60
  61 /***********************************************************************
  62  *           wine_pthread_set_functions
  63  */
  64 void wine_pthread_set_functions( const struct wine_pthread_functions *functions, size_t size )
  65 {
  66     memcpy( &pthread_functions, functions, min( size, sizeof(pthread_functions) ));
  67 }
  68
  69
  70 /***********************************************************************
  71  *           wine_switch_to_stack
  72  *
  73  * Switch to the specified stack and call the function.
  74  */
  75 void DECLSPEC_NORETURN wine_switch_to_stack( void (*func)(void *), void *arg, void *stack )
  76 {
  77     wine_call_on_stack( (int (*)(void *))func, arg, stack );
  78     abort();
  79 }
  80
  81
  82 /***********************************************************************
  83  *           wine_call_on_stack
  84  *
  85  * Switch to the specified stack to call the function and return.
  86  */
  87
  88 #if defined(__i386__) && defined(__GNUC__)
  89 __ASM_GLOBAL_FUNC( wine_call_on_stack,
  90                    "pushl %ebp\n\t"
  91                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
  92                    __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
  93                    "pushl %esi\n\t"
  94                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
  95                    __ASM_CFI(".cfi_rel_offset %esi,0\n\t")
  96                    "movl %esp,%esi\n\t"
  97                    __ASM_CFI(".cfi_def_cfa_register %esi\n\t")
  98                    "movl 12(%esp),%ecx\n\t"  /* func */
  99                    "movl 16(%esp),%edx\n\t"  /* arg */
 100                    "movl 20(%esp),%eax\n\t"  /* stack */
 101                    "andl $~15,%eax\n\t"
 102                    "subl $12,%eax\n\t"
 103                    "movl %eax,%esp\n\t"
 104                    "pushl %edx\n\t"
 105                    "xorl %ebp,%ebp\n\t"
 106                    "call *%ecx\n\t"
 107                    "movl %esi,%esp\n\t"
 108                    "popl %esi\n\t"
 109                    __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
 110                    __ASM_CFI(".cfi_same_value %esi\n\t")
 111                    "popl %ebp\n\t"
 112                    __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
 113                    __ASM_CFI(".cfi_same_value %ebp\n\t")
 114                    "ret" )
 115 #elif defined(__i386__) && defined(_MSC_VER)
 116 __declspec(naked) int wine_call_on_stack( int (*func)(void *), void *arg, void *stack )
 117 {
 118   __asm push ebp;
 119   __asm push esi;
 120   __asm mov ecx, 12[esp];
 121   __asm mov edx, 16[esp];
 122   __asm mov esi, 20[esp];
 123   __asm xchg esp, esi;
 124   __asm push edx;
 125   __asm xor ebp, ebp;
 126   __asm call [ecx];
 127   __asm mov esp, esi;
 128   __asm pop esi;
 129   __asm pop ebp
 130   __asm ret;
 131 }
 132 #elif defined(__x86_64__) && defined(__GNUC__)
 133 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 134                    "pushq %rbp\n\t"
 135                    __ASM_CFI(".cfi_adjust_cfa_offset 8\n\t")
 136                    __ASM_CFI(".cfi_rel_offset %rbp,0\n\t")
 137                    "movq %rsp,%rbp\n\t"
 138                    __ASM_CFI(".cfi_def_cfa_register %rbp\n\t")
 139                    "movq %rdi,%rax\n\t" /* func */
 140                    "movq %rsi,%rdi\n\t" /* arg */
 141                    "andq $~15,%rdx\n\t" /* stack */
 142                    "movq %rdx,%rsp\n\t"
 143                    "callq *%rax\n\t"    /* call func */
 144                    "movq %rbp,%rsp\n\t"
 145                    __ASM_CFI(".cfi_def_cfa_register %rsp\n\t")
 146                    "popq %rbp\n\t"
 147                    __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t")
 148                    __ASM_CFI(".cfi_same_value %rbp\n\t")
 149                    "ret")
 150 #elif defined(__powerpc__) && defined(__GNUC__)
 151 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 152                    "mflr 0\n\t"         /* get return address */
 153                    "stw 0, 4(1)\n\t"    /* save return address */
 154                    "subi 5, 5, 16\n\t" /* reserve space on new stack */
 155                    "stw 1, 12(5)\n\t"   /* store old sp */
 156                    "mtctr 3\n\t"        /* func -> ctr */
 157                    "mr 3,4\n\t"         /* args -> function param 1 (r3) */
 158                    "mr 1,5\n\t"         /* stack */
 159                    "li 0, 0\n\t"        /* zero */
 160                    "stw 0, 0(1)\n\t"    /* bottom of stack */
 161                    "stwu 1, -16(1)\n\t" /* create a frame for this function */
 162                    "bctrl\n\t"          /* call ctr */
 163                    "lwz 1, 28(1)\n\t"   /* fetch old sp */
 164                    "lwz 0, 4(1)\n\t"    /* fetch return address */
 165                    "mtlr 0\n\t"         /* return address -> lr */
 166                    "blr")               /* return */
 167 #elif defined(__arm__) && defined(__GNUC__)
 168 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 169                    "push {r4,LR}\n\t"   /* save return address on stack */
 170                    "mov r4, sp\n\t"     /* store old sp in local var */
 171                    "mov sp, r2\n\t"     /* stack */
 172                    "mov r2, r0\n\t"     /* func -> scratch register */
 173                    "mov r0, r1\n\t"     /* arg */
 174                    "blx r2\n\t"         /* call func */
 175                    "mov sp, r4\n\t"     /* restore old sp from local var */
 176                    "pop {r4,PC}")       /* fetch return address into pc */
 177 #elif defined(__aarch64__) && defined(__GNUC__)
 178 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 179                    "stp x29, x30, [sp,#-32]!\n\t"    /* save return address on stack */
 180                    "str x19, [sp,#16]\n\t"           /* save register on stack */
 181                    "mov x19, sp\n\t"                 /* store old sp in local var */
 182                    "mov sp, x2\n\t"                  /* stack */
 183                    "mov x2, x0\n\t"                  /* func -> scratch register */
 184                    "mov x0, x1\n\t"                  /* arg */
 185                    "blr x2\n\t"                      /* call func */
 186                    "mov sp, x19\n\t"                 /* restore old sp from local var */
 187                    "ldr x19, [sp,#16]\n\t"           /* restore register from stack */
 188                    "ldp x29, x30, [sp],#32\n\t"      /* restore return address */
 189                    "ret")                            /* return */
 190 #else
 191 #error You must implement wine_call_on_stack for your platform
 192 #endif