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 #define WINE_UNICODE_INLINE  /* nothing */
  29 #include "wine/unicode.h"
  30 #include "wine/library.h"
  31 #include "wine/asm.h"
  32
  33 /* functions from libwine_port that are also exported from libwine for backwards compatibility,
  34  * on platforms that require it */
  35 #ifndef __ANDROID__
  36 const void *libwine_port_functions[] =
  37 {
  38     strtolW,
  39     vsnprintfW,
  40     wine_compare_string,
  41     wine_cp_enum_table,
  42     wine_cp_get_table,
  43     wine_cp_mbstowcs,
  44     wine_cp_wcstombs,
  45     wine_cpsymbol_mbstowcs,
  46     wine_cpsymbol_wcstombs,
  47     wine_fold_string,
  48     wine_utf8_mbstowcs,
  49     wine_utf8_wcstombs
  50 };
  51 #endif
  52
  53 /* no longer used, for backwards compatibility only */
  54 struct wine_pthread_functions;
  55 static void *pthread_functions[8];
  56
  57 /***********************************************************************
  58  *           wine_pthread_get_functions
  59  */
  60 void wine_pthread_get_functions( struct wine_pthread_functions *functions, size_t size )
  61 {
  62     memcpy( functions, &pthread_functions, min( size, sizeof(pthread_functions) ));
  63 }
  64
  65
  66 /***********************************************************************
  67  *           wine_pthread_set_functions
  68  */
  69 void wine_pthread_set_functions( const struct wine_pthread_functions *functions, size_t size )
  70 {
  71     memcpy( &pthread_functions, functions, min( size, sizeof(pthread_functions) ));
  72 }
  73
  74
  75 /***********************************************************************
  76  *           wine_switch_to_stack
  77  *
  78  * Switch to the specified stack and call the function.
  79  */
  80 void DECLSPEC_NORETURN wine_switch_to_stack( void (*func)(void *), void *arg, void *stack )
  81 {
  82     wine_call_on_stack( (int (*)(void *))func, arg, stack );
  83     abort();
  84 }
  85
  86
  87 /***********************************************************************
  88  *           wine_call_on_stack
  89  *
  90  * Switch to the specified stack to call the function and return.
  91  */
  92
  93 #if defined(__i386__) && defined(__GNUC__)
  94 __ASM_GLOBAL_FUNC( wine_call_on_stack,
  95                    "pushl %ebp\n\t"
  96                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
  97                    __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
  98                    "pushl %esi\n\t"
  99                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 100                    __ASM_CFI(".cfi_rel_offset %esi,0\n\t")
 101                    "movl %esp,%esi\n\t"
 102                    __ASM_CFI(".cfi_def_cfa_register %esi\n\t")
 103                    "movl 12(%esp),%ecx\n\t"  /* func */
 104                    "movl 16(%esp),%edx\n\t"  /* arg */
 105                    "movl 20(%esp),%eax\n\t"  /* stack */
 106                    "andl $~15,%eax\n\t"
 107                    "subl $12,%eax\n\t"
 108                    "movl %eax,%esp\n\t"
 109                    "pushl %edx\n\t"
 110                    "xorl %ebp,%ebp\n\t"
 111                    "call *%ecx\n\t"
 112                    "movl %esi,%esp\n\t"
 113                    "popl %esi\n\t"
 114                    __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
 115                    __ASM_CFI(".cfi_same_value %esi\n\t")
 116                    "popl %ebp\n\t"
 117                    __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
 118                    __ASM_CFI(".cfi_same_value %ebp\n\t")
 119                    "ret" )
 120 #elif defined(__i386__) && defined(_MSC_VER)
 121 __declspec(naked) int wine_call_on_stack( int (*func)(void *), void *arg, void *stack )
 122 {
 123   __asm push ebp;
 124   __asm push esi;
 125   __asm mov ecx, 12[esp];
 126   __asm mov edx, 16[esp];
 127   __asm mov esi, 20[esp];
 128   __asm xchg esp, esi;
 129   __asm push edx;
 130   __asm xor ebp, ebp;
 131   __asm call [ecx];
 132   __asm mov esp, esi;
 133   __asm pop esi;
 134   __asm pop ebp;
 135   __asm ret;
 136 }
 137 #elif defined(__x86_64__) && defined(__GNUC__)
 138 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 139                    "pushq %rbp\n\t"
 140                    __ASM_CFI(".cfi_adjust_cfa_offset 8\n\t")
 141                    __ASM_CFI(".cfi_rel_offset %rbp,0\n\t")
 142                    "movq %rsp,%rbp\n\t"
 143                    __ASM_CFI(".cfi_def_cfa_register %rbp\n\t")
 144                    "movq %rdi,%rax\n\t" /* func */
 145                    "movq %rsi,%rdi\n\t" /* arg */
 146                    "andq $~15,%rdx\n\t" /* stack */
 147                    "movq %rdx,%rsp\n\t"
 148                    "callq *%rax\n\t"    /* call func */
 149                    "movq %rbp,%rsp\n\t"
 150                    __ASM_CFI(".cfi_def_cfa_register %rsp\n\t")
 151                    "popq %rbp\n\t"
 152                    __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t")
 153                    __ASM_CFI(".cfi_same_value %rbp\n\t")
 154                    "ret")
 155 #elif defined(__powerpc__) && defined(__GNUC__)
 156 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 157                    "mflr 0\n\t"         /* get return address */
 158                    "stw 0, 4(1)\n\t"    /* save return address */
 159                    "subi 5, 5, 16\n\t" /* reserve space on new stack */
 160                    "stw 1, 12(5)\n\t"   /* store old sp */
 161                    "mtctr 3\n\t"        /* func -> ctr */
 162                    "mr 3,4\n\t"         /* args -> function param 1 (r3) */
 163                    "mr 1,5\n\t"         /* stack */
 164                    "li 0, 0\n\t"        /* zero */
 165                    "stw 0, 0(1)\n\t"    /* bottom of stack */
 166                    "stwu 1, -16(1)\n\t" /* create a frame for this function */
 167                    "bctrl\n\t"          /* call ctr */
 168                    "lwz 1, 28(1)\n\t"   /* fetch old sp */
 169                    "lwz 0, 4(1)\n\t"    /* fetch return address */
 170                    "mtlr 0\n\t"         /* return address -> lr */
 171                    "blr")               /* return */
 172 #elif defined(__arm__) && defined(__GNUC__)
 173 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 174                    "push {r4,LR}\n\t"   /* save return address on stack */
 175                    "mov r4, sp\n\t"     /* store old sp in local var */
 176                    "mov sp, r2\n\t"     /* stack */
 177                    "mov r2, r0\n\t"     /* func -> scratch register */
 178                    "mov r0, r1\n\t"     /* arg */
 179                    "blx r2\n\t"         /* call func */
 180                    "mov sp, r4\n\t"     /* restore old sp from local var */
 181                    "pop {r4,PC}")       /* fetch return address into pc */
 182 #elif defined(__aarch64__) && defined(__GNUC__)
 183 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 184                    "stp x29, x30, [sp,#-32]!\n\t"    /* save return address on stack */
 185                    "str x19, [sp,#16]\n\t"           /* save register on stack */
 186                    "mov x19, sp\n\t"                 /* store old sp in local var */
 187                    "mov sp, x2\n\t"                  /* stack */
 188                    "mov x2, x0\n\t"                  /* func -> scratch register */
 189                    "mov x0, x1\n\t"                  /* arg */
 190                    "blr x2\n\t"                      /* call func */
 191                    "mov sp, x19\n\t"                 /* restore old sp from local var */
 192                    "ldr x19, [sp,#16]\n\t"           /* restore register from stack */
 193                    "ldp x29, x30, [sp],#32\n\t"      /* restore return address */
 194                    "ret")                            /* return */
 195 #else
 196 #error You must implement wine_call_on_stack for your platform
 197 #endif