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1 | /* | |
2 | * Copyright (c) 1999-2011 Apple 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 | * C runtime startup for interface to the dynamic linker. | |
25 | * This is the same as the entry point in crt0.o with the addition of the | |
26 | * address of the mach header passed as the an extra first argument. | |
27 | * | |
28 | * Kernel sets up stack frame to look like: | |
29 | * | |
30 | * | STRING AREA | | |
31 | * +-------------+ | |
32 | * | 0 | | |
33 | * +-------------+ | |
34 | * | apple[n] | | |
35 | * +-------------+ | |
36 | * : | |
37 | * +-------------+ | |
38 | * | apple[0] | | |
39 | * +-------------+ | |
40 | * | 0 | | |
41 | * +-------------+ | |
42 | * | env[n] | | |
43 | * +-------------+ | |
44 | * : | |
45 | * : | |
46 | * +-------------+ | |
47 | * | env[0] | | |
48 | * +-------------+ | |
49 | * | 0 | | |
50 | * +-------------+ | |
51 | * | arg[argc-1] | | |
52 | * +-------------+ | |
53 | * : | |
54 | * : | |
55 | * +-------------+ | |
56 | * | arg[0] | | |
57 | * +-------------+ | |
58 | * | argc | | |
59 | * +-------------+ | |
60 | * sp-> | mh | address of where the a.out's file offset 0 is in memory | |
61 | * +-------------+ | |
62 | * | |
63 | * Where arg[i] and env[i] point into the STRING AREA | |
64 | */ | |
65 | ||
66 | ||
67 | #include <TargetConditionals.h> | |
68 | ||
69 | .globl __dyld_start | |
70 | ||
71 | #if __i386__ && !TARGET_OS_SIMULATOR | |
72 | .text | |
73 | .align 4, 0x90 | |
74 | .globl __dyld_start | |
75 | __dyld_start: | |
76 | popl %edx # edx = mh of app | |
77 | pushl $0 # push a zero for debugger end of frames marker | |
78 | movl %esp,%ebp # pointer to base of kernel frame | |
79 | andl $-16,%esp # force SSE alignment | |
80 | subl $32,%esp # room for locals and outgoing parameters | |
81 | ||
82 | call L__dyld_start_picbase | |
83 | L__dyld_start_picbase: | |
84 | popl %ebx # set %ebx to runtime value of picbase | |
85 | ||
86 | # call dyldbootstrap::start(app_mh, argc, argv, dyld_mh, &startGlue) | |
87 | subl $L__dyld_start_picbase-__dyld_start, %ebx # ebx = &__dyld_start | |
88 | subl $0x1000, %ebx # ebx = load address of dyld | |
89 | movl %edx,(%esp) # param1 = app_mh | |
90 | movl 4(%ebp),%eax | |
91 | movl %eax,4(%esp) # param2 = argc | |
92 | lea 8(%ebp),%eax | |
93 | movl %eax,8(%esp) # param3 = argv | |
94 | movl %ebx,12(%esp) # param4 = dyld load address | |
95 | lea 28(%esp),%eax | |
96 | movl %eax,16(%esp) # param5 = &startGlue | |
97 | call __ZN13dyldbootstrap5startEPKN5dyld311MachOLoadedEiPPKcS3_Pm | |
98 | movl 28(%esp),%edx | |
99 | cmpl $0,%edx | |
100 | jne Lnew | |
101 | ||
102 | # clean up stack and jump to "start" in main executable | |
103 | movl %ebp,%esp # restore the unaligned stack pointer | |
104 | addl $4,%esp # remove debugger end frame marker | |
105 | movl $0,%ebp # restore ebp back to zero | |
106 | jmp *%eax # jump to the entry point | |
107 | ||
108 | # LC_MAIN case, set up stack for call to main() | |
109 | Lnew: movl 4(%ebp),%ebx | |
110 | movl %ebx,(%esp) # main param1 = argc | |
111 | leal 8(%ebp),%ecx | |
112 | movl %ecx,4(%esp) # main param2 = argv | |
113 | leal 0x4(%ecx,%ebx,4),%ebx | |
114 | movl %ebx,8(%esp) # main param3 = env | |
115 | Lapple: movl (%ebx),%ecx # look for NULL ending env[] array | |
116 | add $4,%ebx | |
117 | testl %ecx,%ecx | |
118 | jne Lapple # once found, next pointer is "apple" parameter now in %ebx | |
119 | movl %ebx,12(%esp) # main param4 = apple | |
120 | pushl %edx # simulate return address into _start in libdyld | |
121 | jmp *%eax # jump to main(argc,argv,env,apple) with return address set to _start | |
122 | ||
123 | #endif /* __i386__ && !TARGET_OS_SIMULATOR*/ | |
124 | ||
125 | ||
126 | ||
127 | #if __x86_64__ && !TARGET_OS_SIMULATOR | |
128 | .text | |
129 | .align 2,0x90 | |
130 | .globl __dyld_start | |
131 | __dyld_start: | |
132 | popq %rdi # param1 = mh of app | |
133 | pushq $0 # push a zero for debugger end of frames marker | |
134 | movq %rsp,%rbp # pointer to base of kernel frame | |
135 | andq $-16,%rsp # force SSE alignment | |
136 | subq $16,%rsp # room for local variables | |
137 | ||
138 | # call dyldbootstrap::start(app_mh, argc, argv, dyld_mh, &startGlue) | |
139 | movl 8(%rbp),%esi # param2 = argc into %esi | |
140 | leaq 16(%rbp),%rdx # param3 = &argv[0] into %rdx | |
141 | leaq ___dso_handle(%rip),%rcx # param4 = dyldsMachHeader into %rcx | |
142 | leaq -8(%rbp),%r8 # param5 = &glue into %r8 | |
143 | call __ZN13dyldbootstrap5startEPKN5dyld311MachOLoadedEiPPKcS3_Pm | |
144 | movq -8(%rbp),%rdi | |
145 | cmpq $0,%rdi | |
146 | jne Lnew | |
147 | ||
148 | # clean up stack and jump to "start" in main executable | |
149 | movq %rbp,%rsp # restore the unaligned stack pointer | |
150 | addq $8,%rsp # remove the mh argument, and debugger end frame marker | |
151 | movq $0,%rbp # restore ebp back to zero | |
152 | jmp *%rax # jump to the entry point | |
153 | ||
154 | # LC_MAIN case, set up stack for call to main() | |
155 | Lnew: addq $16,%rsp # remove local variables | |
156 | pushq %rdi # simulate return address into _start in libdyld | |
157 | movq 8(%rbp),%rdi # main param1 = argc into %rdi | |
158 | leaq 16(%rbp),%rsi # main param2 = &argv[0] into %rsi | |
159 | leaq 0x8(%rsi,%rdi,8),%rdx # main param3 = &env[0] into %rdx | |
160 | movq %rdx,%rcx | |
161 | Lapple: movq (%rcx),%r8 | |
162 | add $8,%rcx | |
163 | testq %r8,%r8 # look for NULL ending env[] array | |
164 | jne Lapple # main param4 = apple into %rcx | |
165 | jmp *%rax # jump to main(argc,argv,env,apple) with return address set to _start | |
166 | #endif /* __x86_64__ && !TARGET_OS_SIMULATOR*/ | |
167 | ||
168 | ||
169 | ||
170 | #if __arm__ | |
171 | .text | |
172 | .align 2 | |
173 | __dyld_start: | |
174 | mov r8, sp // save stack pointer | |
175 | sub sp, #16 // make room for outgoing parameters | |
176 | bic sp, sp, #15 // force 16-byte alignment | |
177 | ||
178 | // call dyldbootstrap::start(app_mh, argc, argv, dyld_mh, &startGlue) | |
179 | ldr r0, [r8] // r0 = mach_header | |
180 | ldr r1, [r8, #4] // r1 = argc | |
181 | add r2, r8, #8 // r2 = argv | |
182 | adr r3, __dyld_start | |
183 | sub r3 ,r3, #0x1000 // r3 = dyld_mh | |
184 | add r4, sp, #12 | |
185 | str r4, [sp, #0] // [sp] = &startGlue | |
186 | ||
187 | bl __ZN13dyldbootstrap5startEPKN5dyld311MachOLoadedEiPPKcS3_Pm | |
188 | ldr r5, [sp, #12] | |
189 | cmp r5, #0 | |
190 | bne Lnew | |
191 | ||
192 | // traditional case, clean up stack and jump to result | |
193 | add sp, r8, #4 // remove the mach_header argument. | |
194 | bx r0 // jump to the program's entry point | |
195 | ||
196 | // LC_MAIN case, set up stack for call to main() | |
197 | Lnew: mov lr, r5 // simulate return address into _start in libdyld | |
198 | mov r5, r0 // save address of main() for later use | |
199 | ldr r0, [r8, #4] // main param1 = argc | |
200 | add r1, r8, #8 // main param2 = argv | |
201 | add r2, r1, r0, lsl #2 | |
202 | add r2, r2, #4 // main param3 = &env[0] | |
203 | mov r3, r2 | |
204 | Lapple: ldr r4, [r3] | |
205 | add r3, #4 | |
206 | cmp r4, #0 | |
207 | bne Lapple // main param4 = apple | |
208 | bx r5 | |
209 | ||
210 | #endif /* __arm__ */ | |
211 | ||
212 | ||
213 | ||
214 | ||
215 | #if __arm64__ && !TARGET_OS_SIMULATOR | |
216 | .text | |
217 | .align 2 | |
218 | .globl __dyld_start | |
219 | __dyld_start: | |
220 | mov x28, sp | |
221 | and sp, x28, #~15 // force 16-byte alignment of stack | |
222 | mov x0, #0 | |
223 | mov x1, #0 | |
224 | stp x1, x0, [sp, #-16]! // make aligned terminating frame | |
225 | mov fp, sp // set up fp to point to terminating frame | |
226 | sub sp, sp, #16 // make room for local variables | |
227 | #if __LP64__ | |
228 | ldr x0, [x28] // get app's mh into x0 | |
229 | ldr x1, [x28, #8] // get argc into x1 (kernel passes 32-bit int argc as 64-bits on stack to keep alignment) | |
230 | add x2, x28, #16 // get argv into x2 | |
231 | #else | |
232 | ldr w0, [x28] // get app's mh into x0 | |
233 | ldr w1, [x28, #4] // get argc into x1 (kernel passes 32-bit int argc as 64-bits on stack to keep alignment) | |
234 | add w2, w28, #8 // get argv into x2 | |
235 | #endif | |
236 | adrp x3,___dso_handle@page | |
237 | add x3,x3,___dso_handle@pageoff // get dyld's mh in to x4 | |
238 | mov x4,sp // x5 has &startGlue | |
239 | ||
240 | // call dyldbootstrap::start(app_mh, argc, argv, dyld_mh, &startGlue) | |
241 | bl __ZN13dyldbootstrap5startEPKN5dyld311MachOLoadedEiPPKcS3_Pm | |
242 | mov x16,x0 // save entry point address in x16 | |
243 | #if __LP64__ | |
244 | ldr x1, [sp] | |
245 | #else | |
246 | ldr w1, [sp] | |
247 | #endif | |
248 | cmp x1, #0 | |
249 | b.ne Lnew | |
250 | ||
251 | // LC_UNIXTHREAD way, clean up stack and jump to result | |
252 | #if __LP64__ | |
253 | add sp, x28, #8 // restore unaligned stack pointer without app mh | |
254 | #else | |
255 | add sp, x28, #4 // restore unaligned stack pointer without app mh | |
256 | #endif | |
257 | #if __arm64e__ | |
258 | braaz x16 // jump to the program's entry point | |
259 | #else | |
260 | br x16 // jump to the program's entry point | |
261 | #endif | |
262 | ||
263 | // LC_MAIN case, set up stack for call to main() | |
264 | Lnew: mov lr, x1 // simulate return address into _start in libdyld.dylib | |
265 | #if __LP64__ | |
266 | ldr x0, [x28, #8] // main param1 = argc | |
267 | add x1, x28, #16 // main param2 = argv | |
268 | add x2, x1, x0, lsl #3 | |
269 | add x2, x2, #8 // main param3 = &env[0] | |
270 | mov x3, x2 | |
271 | Lapple: ldr x4, [x3] | |
272 | add x3, x3, #8 | |
273 | #else | |
274 | ldr w0, [x28, #4] // main param1 = argc | |
275 | add x1, x28, #8 // main param2 = argv | |
276 | add x2, x1, x0, lsl #2 | |
277 | add x2, x2, #4 // main param3 = &env[0] | |
278 | mov x3, x2 | |
279 | Lapple: ldr w4, [x3] | |
280 | add x3, x3, #4 | |
281 | #endif | |
282 | cmp x4, #0 | |
283 | b.ne Lapple // main param4 = apple | |
284 | #if __arm64e__ | |
285 | braaz x16 | |
286 | #else | |
287 | br x16 | |
288 | #endif | |
289 | ||
290 | #endif // __arm64__ && !TARGET_OS_SIMULATOR | |
291 | ||
292 | ||
293 | // When iOS 10.0 simulator runs on 10.11, abort_with_payload() does not exist, | |
294 | // so it falls back and uses dyld_fatal_error(). | |
295 | #if TARGET_OS_SIMULATOR | |
296 | .text | |
297 | .align 2 | |
298 | .globl _dyld_fatal_error | |
299 | _dyld_fatal_error: | |
300 | #if __arm64__ || __arm64e__ | |
301 | brk #3 | |
302 | #else | |
303 | int3 | |
304 | #endif | |
305 | nop | |
306 | #endif | |
307 |