4e97a6511b
* Instead of always re-load page-tables when a thread context is switched only do this when another user PD's thread is the next target, core-threads are always executed within the last PD's page-table set * remove the concept of the mode transition * instead map the exception vector once in bootstrap code into kernel's memory segment * when a new page directory is constructed for a user PD, copy over the top-level kernel segment entries on RISCV and X86, on ARM we use a designated page directory register for the kernel segment * transfer the current CPU id from bootstrap to core/kernel in a register to ease first stack address calculation * align cpu context member of threads and vms, because of x86 constraints regarding the stack-pointer loading * introduce Align_at template for members with alignment constraints * let the x86 hardware do part of the context saving in ISS, by passing the thread context into the TSS before leaving to user-land * use one exception vector for all ARM platforms including Arm_v6 Fix #2091
62 lines
1.5 KiB
ArmAsm
62 lines
1.5 KiB
ArmAsm
/**
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* \brief Startup code for Genode 64Bit applications
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* \author Sebastian Sumpf
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* \author Martin Stein
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* \date 2011-05-11
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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.section ".text"
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/***********************
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** kernel entry code **
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***********************/
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.global _start
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_start:
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/* switch to kernel stack */
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mov kernel_stack@GOTPCREL(%rip), %rax
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mov kernel_stack_size@GOTPCREL(%rip), %rbx
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add (%rbx), %rax
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mov %rax, %rsp
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/* jump to C entry code */
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jmp kernel_init
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/*********************************
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** core main thread entry code **
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*********************************/
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.global _core_start
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_core_start:
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/* initialize GLOBAL OFFSET TABLE */
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leaq _GLOBAL_OFFSET_TABLE_(%rip), %r15
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/* create proper environment for the main thread */
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call init_main_thread
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/* apply environment that was created by init_main_thread */
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movq init_main_thread_result@GOTPCREL(%rip), %rax
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movq (%rax), %rsp
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/* clear the base pointer in order that stack backtraces will work */
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xorq %rbp, %rbp
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/*
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* We jump into initial C code instead of calling it as it should never
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* return on the one hand and because the alignment of the stack pointer
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* that init_main_thread returned expects a jump at the other hand. The
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* latter matters because GCC expects the initial stack pointer to be
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* aligned to 16 byte for at least the handling of floating points.
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*/
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jmp _main
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