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i#1569 AArch64: Implement xfer_to_new_libdr.
Some code is moved from arm/arm.asm and aarch64/aarch64.asm into aarchxx/aarchxx.asm, where it is shared between the two architectures. Review-URL: https://codereview.appspot.com/296270043
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| /* ********************************************************** | ||
| * Copyright (c) 2014-2016 Google, Inc. All rights reserved. | ||
| * Copyright (c) 2016 ARM Limited. All rights reserved. | ||
| * **********************************************************/ | ||
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| /* | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright notice, | ||
| * this list of conditions and the following disclaimer. | ||
| * | ||
| * * Redistributions in binary form must reproduce the above copyright notice, | ||
| * this list of conditions and the following disclaimer in the documentation | ||
| * and/or other materials provided with the distribution. | ||
| * | ||
| * * Neither the name of ARM Limited nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software without | ||
| * specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| * ARE DISCLAIMED. IN NO EVENT SHALL ARM LIMITED OR CONTRIBUTORS BE LIABLE | ||
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | ||
| * DAMAGE. | ||
| */ | ||
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| /*************************************************************************** | ||
| * Assembly and trampoline code shared between between ARM and AArch64. | ||
| */ | ||
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| #include "../asm_defines.asm" | ||
| START_FILE | ||
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| #ifdef UNIX | ||
| # if !defined(STANDALONE_UNIT_TEST) && !defined(STATIC_LIBRARY) | ||
| DECLARE_FUNC(_start) | ||
| GLOBAL_LABEL(_start:) | ||
| mov FP, #0 /* clear frame ptr for stack trace bottom */ | ||
| /* i#1676, i#1708: relocate dynamorio if it is not loaded to preferred address. | ||
| * We call this here to ensure it's safe to access globals once in C code | ||
| * (xref i#1865). | ||
| */ | ||
| CALLC2(GLOBAL_REF(relocate_dynamorio), #0, #0) | ||
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| /* Clear 2nd & 3rd args to distinguish from xfer_to_new_libdr */ | ||
| mov ARG2, #0 | ||
| mov ARG3, #0 | ||
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| /* Entry from xfer_to_new_libdr is here. It has set up 2nd & 3rd args already. */ | ||
| .L_start_invoke_C: | ||
| mov FP, #0 /* clear frame ptr for stack trace bottom */ | ||
| mov ARG1, sp /* 1st arg to privload_early_inject */ | ||
| bl GLOBAL_REF(privload_early_inject) | ||
| /* shouldn't return */ | ||
| bl GLOBAL_REF(unexpected_return) | ||
| END_FUNC(_start) | ||
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| /* i#1227: on a conflict with the app we reload ourselves. | ||
| * xfer_to_new_libdr(entry, init_sp, cur_dr_map, cur_dr_size) | ||
| * => | ||
| * Invokes entry after setting sp to init_sp and placing the current (old) | ||
| * libdr bounds in registers for the new libdr to unmap. | ||
| */ | ||
| DECLARE_FUNC(xfer_to_new_libdr) | ||
| GLOBAL_LABEL(xfer_to_new_libdr:) | ||
| mov REG_PRESERVED_1, ARG1 | ||
| /* Restore sp */ | ||
| mov sp, ARG2 | ||
| /* Skip prologue that calls relocate_dynamorio() and clears args 2+3 by | ||
| * adjusting the _start in the reloaded DR by the same distance as in | ||
| * the current DR, but w/o clobbering ARG3 or ARG4. | ||
| */ | ||
| adr ARG1, .L_start_invoke_C | ||
| adr ARG2, _start | ||
| sub ARG1, ARG1, ARG2 | ||
| add REG_PRESERVED_1, REG_PRESERVED_1, ARG1 | ||
| /* _start expects these as 2nd & 3rd args */ | ||
| mov ARG2, ARG3 | ||
| mov ARG3, ARG4 | ||
| INDJMP REG_PRESERVED_1 | ||
| END_FUNC(xfer_to_new_libdr) | ||
| # endif /* !STANDALONE_UNIT_TEST && !STATIC_LIBRARY */ | ||
| #endif /* UNIX */ | ||
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| END_FILE |
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