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/library.h"
  29
  30 /* no longer used, for backwards compatibility only */
  31 struct wine_pthread_functions;
  32 static void *pthread_functions[8];
  33
  34 /***********************************************************************
  35  *           wine_pthread_get_functions
  36  */
  37 void wine_pthread_get_functions( struct wine_pthread_functions *functions, size_t size )
  38 {
  39     memcpy( functions, &pthread_functions, min( size, sizeof(pthread_functions) ));
  40 }
  41
  42
  43 /***********************************************************************
  44  *           wine_pthread_set_functions
  45  */
  46 void wine_pthread_set_functions( const struct wine_pthread_functions *functions, size_t size )
  47 {
  48     memcpy( &pthread_functions, functions, min( size, sizeof(pthread_functions) ));
  49 }
  50
  51
  52 /***********************************************************************
  53  *           wine_switch_to_stack
  54  *
  55  * Switch to the specified stack and call the function.
  56  */
  57 void DECLSPEC_NORETURN wine_switch_to_stack( void (*func)(void *), void *arg, void *stack )
  58 {
  59     wine_call_on_stack( (int (*)(void *))func, arg, stack );
  60     abort();
  61 }
  62
  63
  64 /***********************************************************************
  65  *           wine_call_on_stack
  66  *
  67  * Switch to the specified stack to call the function and return.
  68  */
  69
  70 #if defined(__i386__) && defined(__GNUC__)
  71 __ASM_GLOBAL_FUNC( wine_call_on_stack,
  72                    "pushl %ebp\n\t"
  73                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
  74                    __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
  75                    "pushl %esi\n\t"
  76                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
  77                    __ASM_CFI(".cfi_rel_offset %esi,0\n\t")
  78                    "movl %esp,%esi\n\t"
  79                    __ASM_CFI(".cfi_def_cfa_register %esi\n\t")
  80                    "movl 12(%esp),%ecx\n\t"  /* func */
  81                    "movl 16(%esp),%edx\n\t"  /* arg */
  82                    "movl 20(%esp),%eax\n\t"  /* stack */
  83                    "andl $~15,%eax\n\t"
  84                    "subl $12,%eax\n\t"
  85                    "movl %eax,%esp\n\t"
  86                    "pushl %edx\n\t"
  87                    "xorl %ebp,%ebp\n\t"
  88                    "call *%ecx\n\t"
  89                    "movl %esi,%esp\n\t"
  90                    "popl %esi\n\t"
  91                    __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
  92                    __ASM_CFI(".cfi_same_value %esi\n\t")
  93                    "popl %ebp\n\t"
  94                    __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
  95                    __ASM_CFI(".cfi_same_value %ebp\n\t")
  96                    "ret" )
  97 #elif defined(__i386__) && defined(_MSC_VER)
  98 __declspec(naked) int wine_call_on_stack( int (*func)(void *), void *arg, void *stack )
  99 {
 100   __asm push ebp;
 101   __asm push esi;
 102   __asm mov ecx, 12[esp];
 103   __asm mov edx, 16[esp];
 104   __asm mov esi, 20[esp];
 105   __asm xchg esp, esi;
 106   __asm push edx;
 107   __asm xor ebp, ebp;
 108   __asm call [ecx];
 109   __asm mov esp, esi;
 110   __asm pop esi;
 111   __asm pop ebp
 112   __asm ret;
 113 }
 114 #elif defined(__x86_64__) && defined(__GNUC__)
 115 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 116                    "pushq %rbp\n\t"
 117                    __ASM_CFI(".cfi_adjust_cfa_offset 8\n\t")
 118                    __ASM_CFI(".cfi_rel_offset %rbp,0\n\t")
 119                    "movq %rsp,%rbp\n\t"
 120                    __ASM_CFI(".cfi_def_cfa_register %rbp\n\t")
 121                    "movq %rdi,%rax\n\t" /* func */
 122                    "movq %rsi,%rdi\n\t" /* arg */
 123                    "andq $~15,%rdx\n\t" /* stack */
 124                    "movq %rdx,%rsp\n\t"
 125                    "callq *%rax\n\t"    /* call func */
 126                    "movq %rbp,%rsp\n\t"
 127                    __ASM_CFI(".cfi_def_cfa_register %rsp\n\t")
 128                    "popq %rbp\n\t"
 129                    __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t")
 130                    __ASM_CFI(".cfi_same_value %rbp\n\t")
 131                    "ret")
 132 #elif defined(__powerpc__) && defined(__GNUC__)
 133 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 134                    "mflr 0\n\t"         /* get return address */
 135                    "stw 0, 4(1)\n\t"    /* save return address */
 136                    "subi 5, 5, 16\n\t" /* reserve space on new stack */
 137                    "stw 1, 12(5)\n\t"   /* store old sp */
 138                    "mtctr 3\n\t"        /* func -> ctr */
 139                    "mr 3,4\n\t"         /* args -> function param 1 (r3) */
 140                    "mr 1,5\n\t"         /* stack */
 141                    "li 0, 0\n\t"        /* zero */
 142                    "stw 0, 0(1)\n\t"    /* bottom of stack */
 143                    "stwu 1, -16(1)\n\t" /* create a frame for this function */
 144                    "bctrl\n\t"          /* call ctr */
 145                    "lwz 1, 28(1)\n\t"   /* fetch old sp */
 146                    "lwz 0, 4(1)\n\t"    /* fetch return address */
 147                    "mtlr 0\n\t"         /* return address -> lr */
 148                    "blr")               /* return */
 149 #elif defined(__arm__) && defined(__GNUC__)
 150 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 151                    "push {r4,LR}\n\t"   /* save return address on stack */
 152                    "mov r4, sp\n\t"     /* store old sp in local var */
 153                    "mov sp, r2\n\t"     /* stack */
 154                    "mov r2, r0\n\t"     /* func -> scratch register */
 155                    "mov r0, r1\n\t"     /* arg */
 156                    "blx r2\n\t"         /* call func */
 157                    "mov sp, r4\n\t"     /* restore old sp from local var */
 158                    "pop {r4,PC}")       /* fetch return address into pc */
 159 #elif defined(__aarch64__) && defined(__GNUC__)
 160 __ASM_GLOBAL_FUNC( wine_call_on_stack,
 161                    "stp x29, x30, [sp,#-32]!\n\t"    /* save return address on stack */
 162                    "str x19, [sp,#16]\n\t"           /* save register on stack */
 163                    "mov x19, sp\n\t"                 /* store old sp in local var */
 164                    "mov sp, x2\n\t"                  /* stack */
 165                    "mov x2, x0\n\t"                  /* func -> scratch register */
 166                    "mov x0, x1\n\t"                  /* arg */
 167                    "blr x2\n\t"                      /* call func */
 168                    "mov sp, x19\n\t"                 /* restore old sp from local var */
 169                    "ldr x19, [sp,#16]\n\t"           /* restore register from stack */
 170                    "ldp x29, x30, [sp],#32\n\t"      /* restore return address */
 171                    "ret")                            /* return */
 172 #else
 173 #error You must implement wine_call_on_stack for your platform
 174 #endif