dyld_stub_binder.s [plain text]
/*
* Copyright (c) 2008 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifdef __i386__
#define MH_PARAM_OUT 0
#define LP_PARAM_OUT 4
#define XMMM0_SAVE 16 /* 16-byte align */
#define XMMM1_SAVE 32
#define XMMM2_SAVE 48
#define XMMM3_SAVE 64
#define EAX_SAVE 84
#define ECX_SAVE 88
#define EDX_SAVE 92
#define LP_LOCAL 96
#define MH_LOCAL 100
#define STACK_SIZE 100 /* must be 4 mod 16 so that stack winds up 16-byte aliged */
#define LP_OLD_BP_SAVE 104
/*
* sp+4 lazy binding info offset
* sp+0 address of ImageLoader cache
*/
.text
.align 4,0x90
.globl dyld_stub_binder
.globl _misaligned_stack_error
dyld_stub_binder:
subl $STACK_SIZE,%esp # makes stack 16-byte aligned
movl %eax,EAX_SAVE(%esp)
movl LP_OLD_BP_SAVE(%esp),%eax # get lazy-pointer meta-parameter
movl %eax,LP_LOCAL(%esp)
movl %ebp,LP_OLD_BP_SAVE(%esp) # store epb back chain
movl %esp,%ebp # set epb to be this frame
add $LP_OLD_BP_SAVE,%ebp
movl %ecx,ECX_SAVE(%esp)
movl %edx,EDX_SAVE(%esp)
.align 0,0x90
_misaligned_stack_error_:
movdqa %xmm0,XMMM0_SAVE(%esp)
movdqa %xmm1,XMMM1_SAVE(%esp)
movdqa %xmm2,XMMM2_SAVE(%esp)
movdqa %xmm3,XMMM3_SAVE(%esp)
dyld_stub_binder_:
movl MH_LOCAL(%esp),%eax # call dyld::fastBindLazySymbol(loadercache, lazyinfo)
movl %eax,MH_PARAM_OUT(%esp)
movl LP_LOCAL(%esp),%eax
movl %eax,LP_PARAM_OUT(%esp)
call __Z21_dyld_fast_stub_entryPvl
movdqa XMMM0_SAVE(%esp),%xmm0 # restore registers
movdqa XMMM1_SAVE(%esp),%xmm1
movdqa XMMM2_SAVE(%esp),%xmm2
movdqa XMMM3_SAVE(%esp),%xmm3
movl ECX_SAVE(%esp),%ecx
movl EDX_SAVE(%esp),%edx
movl %eax,%ebp # move target address to epb
movl EAX_SAVE(%esp),%eax # restore eax
addl $STACK_SIZE+4,%esp # cut back stack
xchg %ebp, (%esp) # restore ebp and set target to top of stack
ret # jump to target
#endif /* __i386__ */
#if __x86_64__
#define MH_PARAM_BP 8
#define LP_PARAM_BP 16
#define RDI_SAVE 0
#define RSI_SAVE 8
#define RDX_SAVE 16
#define RCX_SAVE 24
#define R8_SAVE 32
#define R9_SAVE 40
#define RAX_SAVE 48
#define XMMM0_SAVE 64 /* 16-byte align */
#define XMMM1_SAVE 80
#define XMMM2_SAVE 96
#define XMMM3_SAVE 112
#define XMMM4_SAVE 128
#define XMMM5_SAVE 144
#define XMMM6_SAVE 160
#define XMMM7_SAVE 176
#define STACK_SIZE 192 /* (XMMM7_SAVE+16) must be 16 byte aligned too */
/*
* sp+4 lazy binding info offset
* sp+0 address of ImageLoader cache
*/
.align 2,0x90
.globl dyld_stub_binder
dyld_stub_binder:
pushq %rbp
movq %rsp,%rbp
subq $STACK_SIZE,%rsp # at this point stack is 16-byte aligned because two meta-parameters where pushed
movq %rdi,RDI_SAVE(%rsp) # save registers that might be used as parameters
movq %rsi,RSI_SAVE(%rsp)
movq %rdx,RDX_SAVE(%rsp)
movq %rcx,RCX_SAVE(%rsp)
movq %r8,R8_SAVE(%rsp)
movq %r9,R9_SAVE(%rsp)
movq %rax,RAX_SAVE(%rsp)
misaligned_stack_error_entering_dyld_stub_binder:
movdqa %xmm0,XMMM0_SAVE(%rsp)
movdqa %xmm1,XMMM1_SAVE(%rsp)
movdqa %xmm2,XMMM2_SAVE(%rsp)
movdqa %xmm3,XMMM3_SAVE(%rsp)
movdqa %xmm4,XMMM4_SAVE(%rsp)
movdqa %xmm5,XMMM5_SAVE(%rsp)
movdqa %xmm6,XMMM6_SAVE(%rsp)
movdqa %xmm7,XMMM7_SAVE(%rsp)
dyld_stub_binder_:
movq MH_PARAM_BP(%rbp),%rdi # call fastBindLazySymbol(loadercache, lazyinfo)
movq LP_PARAM_BP(%rbp),%rsi
call __Z21_dyld_fast_stub_entryPvl
movq %rax,%r11 # save target
movdqa XMMM0_SAVE(%rsp),%xmm0 # restore registers
movdqa XMMM1_SAVE(%rsp),%xmm1
movdqa XMMM2_SAVE(%rsp),%xmm2
movdqa XMMM3_SAVE(%rsp),%xmm3
movdqa XMMM4_SAVE(%rsp),%xmm4
movdqa XMMM5_SAVE(%rsp),%xmm5
movdqa XMMM6_SAVE(%rsp),%xmm6
movdqa XMMM7_SAVE(%rsp),%xmm7
movq RDI_SAVE(%rsp),%rdi
movq RSI_SAVE(%rsp),%rsi
movq RDX_SAVE(%rsp),%rdx
movq RCX_SAVE(%rsp),%rcx
movq R8_SAVE(%rsp),%r8
movq R9_SAVE(%rsp),%r9
movq RAX_SAVE(%rsp),%rax
addq $STACK_SIZE,%rsp
popq %rbp
addq $16,%rsp # remove meta-parameters
jmp *%r11 # jmp to target
#endif
#if __arm__
/*
* sp+4 lazy binding info offset
* sp+0 address of ImageLoader cache
*/
.text
.align 2
.globl dyld_stub_binder
dyld_stub_binder:
stmfd sp!, {r0,r1,r2,r3,r7,lr} // save registers
add r7, sp, #16 // point FP to previous FP
ldr r0, [sp, #24] // move address ImageLoader cache to 1st parameter
ldr r1, [sp, #28] // move lazy info offset 2nd parameter
// call dyld::fastBindLazySymbol(loadercache, lazyinfo)
bl __Z21_dyld_fast_stub_entryPvl
mov ip, r0 // move the symbol`s address into ip
ldmfd sp!, {r0,r1,r2,r3,r7,lr} // restore registers
add sp, sp, #8 // remove meta-parameters
bx ip // jump to the symbol`s address that was bound
#endif /* __arm__ */