src/stub_binding_helper.s

   1 /*
   2  * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25
  26 #ifdef __i386__
  27 /*
  28  * This is the interface for the stub_binding_helper for i386:
  29  * The caller has pushed the address of the a lazy pointer to be filled in with
  30  * the value for the defined symbol and pushed the address of the the mach
  31  * header this pointer comes from.
  32  *
  33  * sp+4 address of lazy pointer
  34  * sp+0 address of mach header
  35  *
  36  * Some inter-image function calls pass parameters in registers EAX, ECX, EDX, or XXM0-3,
  37  * Therefore those registers need to be preserved during the lazy binding.
  38  *
  39  * After the symbol has been resolved and the pointer filled in this is to pop
  40  * these arguments off the stack and jump to the address of the defined symbol.
  41  */
  42 #define MH_PARAM_BP                     4
  43 #define LP_PARAM_BP                     8
  44 #define RESULT_BP                       8    /* in order to trash no registers, the target is stored back on the stack then ret it done to it */
  45
  46 #define MH_PARAM_OUT        0
  47 #define LP_PARAM_OUT        4
  48 #define EAX_SAVE                        8
  49 #define ECX_SAVE                        12
  50 #define EDX_SAVE                        16
  51 #define XMMM0_SAVE                      32    /* 16-byte align */
  52 #define XMMM1_SAVE                      48
  53 #define XMMM2_SAVE                      64
  54 #define XMMM3_SAVE                      80
  55 #define STACK_SIZE                      96 /*  (XMMM3_SAVE+16) must be 16 byte aligned too */
  56
  57
  58     .text
  59     .align 4,0x90
  60         .globl _fast_stub_binding_helper_interface
  61 _fast_stub_binding_helper_interface:
  62         pushl           $0
  63     .globl _stub_binding_helper_interface
  64 _stub_binding_helper_interface:
  65         pushl           %ebp
  66         movl            %esp,%ebp
  67         subl            $STACK_SIZE,%esp                # at this point stack is 16-byte aligned because two meta-parameters where pushed
  68         movl            %eax,EAX_SAVE(%esp)             # save registers that might be used as parameters
  69         movl            %ecx,ECX_SAVE(%esp)
  70         movl            %edx,EDX_SAVE(%esp)
  71         movdqa          %xmm0,XMMM0_SAVE(%esp)
  72         movdqa          %xmm1,XMMM1_SAVE(%esp)
  73         movdqa          %xmm2,XMMM2_SAVE(%esp)
  74         movdqa          %xmm3,XMMM3_SAVE(%esp)
  75         movl            MH_PARAM_BP(%ebp),%eax  # call dyld::bindLazySymbol(mh, lazy_ptr)
  76         movl            %eax,MH_PARAM_OUT(%esp)
  77         movl            LP_PARAM_BP(%ebp),%eax
  78         movl            %eax,LP_PARAM_OUT(%esp)
  79         call            __ZN4dyld14bindLazySymbolEPK11mach_headerPm
  80         movl            %eax,RESULT_BP(%ebp)    # store target for ret
  81         movdqa          XMMM0_SAVE(%esp),%xmm0  # restore registers
  82         movdqa          XMMM1_SAVE(%esp),%xmm1
  83         movdqa          XMMM2_SAVE(%esp),%xmm2
  84         movdqa          XMMM3_SAVE(%esp),%xmm3
  85         movl            EAX_SAVE(%esp),%eax
  86         movl            ECX_SAVE(%esp),%ecx
  87         movl            EDX_SAVE(%esp),%edx
  88         addl            $STACK_SIZE,%esp
  89         popl            %ebp
  90         addl            $4,%esp                                 # remove meta-parameter, other meta-parmaeter now holds target for ret
  91         ret
  92 #endif /* __i386__ */
  93
  94
  95
  96 #if __x86_64__
  97 /*
  98  * This is the interface for the stub_binding_helper for x86_64:
  99  * The caller has pushed the address of the a lazy pointer to be filled in with
 100  * the value for the defined symbol and pushed the address of the the mach
 101  * header this pointer comes from.
 102  *
 103  * sp+4 address of lazy pointer
 104  * sp+0 address of mach header
 105  *
 106  * All parameters registers must be preserved.
 107  *
 108  * After the symbol has been resolved and the pointer filled in this is to pop
 109  * these arguments off the stack and jump to the address of the defined symbol.
 110  */
 111 #define MH_PARAM_BP                     8
 112 #define LP_PARAM_BP                     16
 113
 114 #define RDI_SAVE                        0
 115 #define RSI_SAVE                        8
 116 #define RDX_SAVE                        16
 117 #define RCX_SAVE                        24
 118 #define R8_SAVE                         32
 119 #define R9_SAVE                         40
 120 #define RAX_SAVE                        48
 121 #define XMMM0_SAVE                      64    /* 16-byte align */
 122 #define XMMM1_SAVE                      80
 123 #define XMMM2_SAVE                      96
 124 #define XMMM3_SAVE                      112
 125 #define XMMM4_SAVE                      128
 126 #define XMMM5_SAVE                      144
 127 #define XMMM6_SAVE                      160
 128 #define XMMM7_SAVE                      176
 129 #define STACK_SIZE                      192 /*  (XMMM7_SAVE+16) must be 16 byte aligned too */
 130
 131     .text
 132     .align 2,0x90
 133     .globl _stub_binding_helper_interface
 134 _stub_binding_helper_interface:
 135         pushq           %rbp
 136         movq            %rsp,%rbp
 137         subq            $STACK_SIZE,%rsp        # at this point stack is 16-byte aligned because two meta-parameters where pushed
 138         movq            %rdi,RDI_SAVE(%rsp)     # save registers that might be used as parameters
 139         movq            %rsi,RSI_SAVE(%rsp)
 140         movq            %rdx,RDX_SAVE(%rsp)
 141         movq            %rcx,RCX_SAVE(%rsp)
 142         movq            %r8,R8_SAVE(%rsp)
 143         movq            %r9,R9_SAVE(%rsp)
 144         movq            %rax,RAX_SAVE(%rsp)
 145         movdqa          %xmm0,XMMM0_SAVE(%rsp)
 146         movdqa          %xmm1,XMMM1_SAVE(%rsp)
 147         movdqa          %xmm2,XMMM2_SAVE(%rsp)
 148         movdqa          %xmm3,XMMM3_SAVE(%rsp)
 149         movdqa          %xmm4,XMMM4_SAVE(%rsp)
 150         movdqa          %xmm5,XMMM5_SAVE(%rsp)
 151         movdqa          %xmm6,XMMM6_SAVE(%rsp)
 152         movdqa          %xmm7,XMMM7_SAVE(%rsp)
 153         movq            MH_PARAM_BP(%rbp),%rdi  # call dyld::bindLazySymbol(mh, lazy_ptr)
 154         movq            LP_PARAM_BP(%rbp),%rsi
 155         call            __ZN4dyld14bindLazySymbolEPK11mach_headerPm
 156         movq            %rax,%r11               # save target
 157         movdqa          XMMM0_SAVE(%rsp),%xmm0  # restore registers
 158         movdqa          XMMM1_SAVE(%rsp),%xmm1
 159         movdqa          XMMM2_SAVE(%rsp),%xmm2
 160         movdqa          XMMM3_SAVE(%rsp),%xmm3
 161         movdqa          XMMM4_SAVE(%rsp),%xmm4
 162         movdqa          XMMM5_SAVE(%rsp),%xmm5
 163         movdqa          XMMM6_SAVE(%rsp),%xmm6
 164         movdqa          XMMM7_SAVE(%rsp),%xmm7
 165         movq            RDI_SAVE(%rsp),%rdi
 166         movq            RSI_SAVE(%rsp),%rsi
 167         movq            RDX_SAVE(%rsp),%rdx
 168         movq            RCX_SAVE(%rsp),%rcx
 169         movq            R8_SAVE(%rsp),%r8
 170         movq            R9_SAVE(%rsp),%r9
 171         movq            RAX_SAVE(%rsp),%rax
 172         addq            $STACK_SIZE,%rsp
 173         popq            %rbp
 174         addq            $16,%rsp                # remove meta-parameters
 175         jmp             *%r11                   # jmp to target
 176
 177 #endif
 178
 179 #if __ppc__ || __ppc64__
 180 #include <architecture/ppc/mode_independent_asm.h>
 181 /*
 182  * This is the interface for the stub_binding_helper for the ppc:
 183  * The caller has placed in r11 the address of the a lazy pointer to be filled
 184  * in with the value for the defined symbol and placed in r12 the address of
 185  * the the mach header this pointer comes from.
 186  *
 187  * r11 address of lazy pointer
 188  * r12 address of mach header
 189  */
 190 #define LRSAVE          MODE_CHOICE(8,16)
 191 #define STACK_SIZE      MODE_CHOICE(144,288)
 192 #define R3SAVE          MODE_CHOICE(56,112)
 193 #define R4SAVE          MODE_CHOICE(60,120)
 194 #define R5SAVE          MODE_CHOICE(64,128)
 195 #define R6SAVE          MODE_CHOICE(68,136)
 196 #define R7SAVE          MODE_CHOICE(72,144)
 197 #define R8SAVE          MODE_CHOICE(76,152)
 198 #define R9SAVE          MODE_CHOICE(80,160)
 199 #define R10SAVE         MODE_CHOICE(84,168)
 200
 201
 202         .text
 203         .align 2
 204         .globl _stub_binding_helper_interface
 205 _stub_binding_helper_interface:
 206         mflr    r0                  ; get link register value
 207         stg     r0,LRSAVE(r1)       ; save link register value in the linkage area
 208         stgu    r1,-STACK_SIZE(r1)  ; save stack pointer and update it
 209
 210         stg     r3,R3SAVE(r1)   ; save all registers that could contain
 211         stg     r4,R4SAVE(r1)   ;  parameters to the routine that is being
 212         stg     r5,R5SAVE(r1)   ;  bound.
 213         stg     r6,R6SAVE(r1)
 214         stg     r7,R7SAVE(r1)
 215         stg     r8,R8SAVE(r1)
 216         stg     r9,R9SAVE(r1)
 217         stg     r10,R10SAVE(r1)
 218
 219         mr      r3,r12          ; move address of mach header to 1st parameter
 220         mr      r4,r11          ; move address of lazy pointer to 2nd parameter
 221         ; call dyld::bindLazySymbol(mh, lazy_symbol_pointer_address)
 222         bl      __ZN4dyld14bindLazySymbolEPK11mach_headerPm
 223         mr      r12,r3          ; move the symbol`s address into r12
 224         mtctr   r12             ; move the symbol`s address into count register
 225
 226         lg      r0,STACK_SIZE+LRSAVE(r1)        ; get old link register value
 227
 228         lg      r3,R3SAVE(r1)   ; restore all registers that could contain
 229         lg      r4,R4SAVE(r1)   ;  parameters to the routine that was bound.
 230         lg      r5,R5SAVE(r1)
 231         lg      r6,R6SAVE(r1)
 232         lg      r7,R7SAVE(r1)
 233         lg      r8,R8SAVE(r1)
 234         lg      r9,R9SAVE(r1)
 235         lg      r10,R10SAVE(r1)
 236
 237         addi    r1,r1,STACK_SIZE; restore old stack pointer
 238         mtlr    r0              ; restore link register
 239
 240         bctr                    ; jump to the symbol`s address that was bound
 241
 242 #endif /* __ppc__ */
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253