toolkit/crashreporter/google-breakpad/src/common/android/breakpad_getcontext.S@129ffea94266 (annotated)
toolkit/crashreporter/google-breakpad/src/common/android/breakpad_getcontext.S
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | // Copyright (c) 2012, Google Inc. |
| michael@0 | 2 | // All rights reserved. |
| michael@0 | 3 | // |
| michael@0 | 4 | // Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | // modification, are permitted provided that the following conditions are |
| michael@0 | 6 | // met: |
| michael@0 | 7 | // |
| michael@0 | 8 | // * Redistributions of source code must retain the above copyright |
| michael@0 | 9 | // notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | // * Redistributions in binary form must reproduce the above |
| michael@0 | 11 | // copyright notice, this list of conditions and the following disclaimer |
| michael@0 | 12 | // in the documentation and/or other materials provided with the |
| michael@0 | 13 | // distribution. |
| michael@0 | 14 | // * Neither the name of Google Inc. nor the names of its |
| michael@0 | 15 | // contributors may be used to endorse or promote products derived from |
| michael@0 | 16 | // this software without specific prior written permission. |
| michael@0 | 17 | // |
| michael@0 | 18 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 19 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 20 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| michael@0 | 21 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| michael@0 | 22 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| michael@0 | 23 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| michael@0 | 24 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| michael@0 | 25 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| michael@0 | 26 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 27 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| michael@0 | 28 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 29 | |
| michael@0 | 30 | // A minimalistic implementation of getcontext() to be used by |
| michael@0 | 31 | // Google Breakpad on Android. |
| michael@0 | 32 | |
| michael@0 | 33 | #include "common/android/ucontext_constants.h" |
| michael@0 | 34 | |
| michael@0 | 35 | /* int getcontext (ucontext_t *ucp) */ |
| michael@0 | 36 | |
| michael@0 | 37 | #ifdef __arm__ |
| michael@0 | 38 | |
| michael@0 | 39 | .text |
| michael@0 | 40 | .global breakpad_getcontext |
| michael@0 | 41 | .hidden breakpad_getcontext |
| michael@0 | 42 | .type breakpad_getcontext, #function |
| michael@0 | 43 | .align 0 |
| michael@0 | 44 | .fnstart |
| michael@0 | 45 | breakpad_getcontext: |
| michael@0 | 46 | |
| michael@0 | 47 | /* First, save r4-r11 */ |
| michael@0 | 48 | add r1, r0, #(MCONTEXT_GREGS_OFFSET + 4*4) |
| michael@0 | 49 | stm r1, {r4-r11} |
| michael@0 | 50 | |
| michael@0 | 51 | /* r12 is a scratch register, don't save it */ |
| michael@0 | 52 | |
| michael@0 | 53 | /* Save sp and lr explicitely. */ |
| michael@0 | 54 | /* - sp can't be stored with stmia in Thumb-2 */ |
| michael@0 | 55 | /* - STM instructions that store sp and pc are deprecated in ARM */ |
| michael@0 | 56 | str sp, [r0, #(MCONTEXT_GREGS_OFFSET + 13*4)] |
| michael@0 | 57 | str lr, [r0, #(MCONTEXT_GREGS_OFFSET + 14*4)] |
| michael@0 | 58 | |
| michael@0 | 59 | /* Save the caller's address in 'pc' */ |
| michael@0 | 60 | str lr, [r0, #(MCONTEXT_GREGS_OFFSET + 15*4)] |
| michael@0 | 61 | |
| michael@0 | 62 | /* Save ucontext_t* pointer accross next call */ |
| michael@0 | 63 | mov r4, r0 |
| michael@0 | 64 | |
| michael@0 | 65 | /* Call sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */ |
| michael@0 | 66 | mov r0, #0 /* SIG_BLOCK */ |
| michael@0 | 67 | mov r1, #0 /* NULL */ |
| michael@0 | 68 | add r2, r4, #UCONTEXT_SIGMASK_OFFSET |
| michael@0 | 69 | bl sigprocmask(PLT) |
| michael@0 | 70 | |
| michael@0 | 71 | /* Intentionally do not save the FPU state here. This is because on |
| michael@0 | 72 | * Linux/ARM, one should instead use ptrace(PTRACE_GETFPREGS) or |
| michael@0 | 73 | * ptrace(PTRACE_GETVFPREGS) to get it. |
| michael@0 | 74 | * |
| michael@0 | 75 | * Note that a real implementation of getcontext() would need to save |
| michael@0 | 76 | * this here to allow setcontext()/swapcontext() to work correctly. |
| michael@0 | 77 | */ |
| michael@0 | 78 | |
| michael@0 | 79 | /* Restore the values of r4 and lr */ |
| michael@0 | 80 | mov r0, r4 |
| michael@0 | 81 | ldr lr, [r0, #(MCONTEXT_GREGS_OFFSET + 14*4)] |
| michael@0 | 82 | ldr r4, [r0, #(MCONTEXT_GREGS_OFFSET + 4*4)] |
| michael@0 | 83 | |
| michael@0 | 84 | /* Return 0 */ |
| michael@0 | 85 | mov r0, #0 |
| michael@0 | 86 | bx lr |
| michael@0 | 87 | |
| michael@0 | 88 | .fnend |
| michael@0 | 89 | .size breakpad_getcontext, . - breakpad_getcontext |
| michael@0 | 90 | |
| michael@0 | 91 | #elif defined(__i386__) |
| michael@0 | 92 | |
| michael@0 | 93 | .text |
| michael@0 | 94 | .global breakpad_getcontext |
| michael@0 | 95 | .hidden breakpad_getcontext |
| michael@0 | 96 | .align 4 |
| michael@0 | 97 | .type breakpad_getcontext, @function |
| michael@0 | 98 | |
| michael@0 | 99 | breakpad_getcontext: |
| michael@0 | 100 | |
| michael@0 | 101 | movl 4(%esp), %eax /* eax = uc */ |
| michael@0 | 102 | |
| michael@0 | 103 | /* Save register values */ |
| michael@0 | 104 | movl %ecx, MCONTEXT_ECX_OFFSET(%eax) |
| michael@0 | 105 | movl %edx, MCONTEXT_EDX_OFFSET(%eax) |
| michael@0 | 106 | movl %ebx, MCONTEXT_EBX_OFFSET(%eax) |
| michael@0 | 107 | movl %edi, MCONTEXT_EDI_OFFSET(%eax) |
| michael@0 | 108 | movl %esi, MCONTEXT_ESI_OFFSET(%eax) |
| michael@0 | 109 | movl %ebp, MCONTEXT_EBP_OFFSET(%eax) |
| michael@0 | 110 | |
| michael@0 | 111 | movl (%esp), %edx /* return address */ |
| michael@0 | 112 | lea 4(%esp), %ecx /* exclude return address from stack */ |
| michael@0 | 113 | mov %edx, MCONTEXT_EIP_OFFSET(%eax) |
| michael@0 | 114 | mov %ecx, MCONTEXT_ESP_OFFSET(%eax) |
| michael@0 | 115 | |
| michael@0 | 116 | xorl %ecx, %ecx |
| michael@0 | 117 | movw %fs, %cx |
| michael@0 | 118 | mov %ecx, MCONTEXT_FS_OFFSET(%eax) |
| michael@0 | 119 | |
| michael@0 | 120 | movl $0, MCONTEXT_EAX_OFFSET(%eax) |
| michael@0 | 121 | |
| michael@0 | 122 | /* Save floating point state to fpregstate, then update |
| michael@0 | 123 | * the fpregs pointer to point to it */ |
| michael@0 | 124 | leal UCONTEXT_FPREGS_MEM_OFFSET(%eax), %ecx |
| michael@0 | 125 | fnstenv (%ecx) |
| michael@0 | 126 | fldenv (%ecx) |
| michael@0 | 127 | mov %ecx, UCONTEXT_FPREGS_OFFSET(%eax) |
| michael@0 | 128 | |
| michael@0 | 129 | /* Save signal mask: sigprocmask(SIGBLOCK, NULL, &uc->uc_sigmask) */ |
| michael@0 | 130 | leal UCONTEXT_SIGMASK_OFFSET(%eax), %edx |
| michael@0 | 131 | xorl %ecx, %ecx |
| michael@0 | 132 | push %edx /* &uc->uc_sigmask */ |
| michael@0 | 133 | push %ecx /* NULL */ |
| michael@0 | 134 | push %ecx /* SIGBLOCK == 0 on i386 */ |
| michael@0 | 135 | call sigprocmask@PLT |
| michael@0 | 136 | addl $12, %esp |
| michael@0 | 137 | |
| michael@0 | 138 | movl $0, %eax |
| michael@0 | 139 | ret |
| michael@0 | 140 | |
| michael@0 | 141 | .size breakpad_getcontext, . - breakpad_getcontext |
| michael@0 | 142 | |
| michael@0 | 143 | #else |
| michael@0 | 144 | #error "This file has not been ported for your CPU!" |
| michael@0 | 145 | #endif |
