X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Femul%2Fswitch_x86_64.s;h=ea76d2c98ed9d1246652f3aac29f1ad2152c0f19;hb=7911a6f01bc8a19f220f98e2fdc8595f65996853;hp=5fb4da658d1663d461c4fb91218285d212fb82f2;hpb=89080d17850a68d57281c14430ee74c94b7f359d;p=bertos.git diff --git a/bertos/emul/switch_x86_64.s b/bertos/emul/switch_x86_64.s index 5fb4da65..ea76d2c9 100644 --- a/bertos/emul/switch_x86_64.s +++ b/bertos/emul/switch_x86_64.s @@ -1,71 +1,72 @@ -/*! +/** * \file * + * This file is part of BeRTOS. * - * \brief i386 context switch + * Bertos is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. * - * \version $Id$ + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. * - * \author Bernardo Innocenti - */ - -/* - * $Log$ - * Revision 1.4 2006/09/20 14:02:49 marco - * C-style comment. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * - * Revision 1.3 2006/02/24 01:35:40 bernie - * Update for new emulator. + * As a special exception, you may use this file as part of a free software + * library without restriction. Specifically, if other files instantiate + * templates or use macros or inline functions from this file, or you compile + * this file and link it with other files to produce an executable, this + * file does not by itself cause the resulting executable to be covered by + * the GNU General Public License. This exception does not however + * invalidate any other reasons why the executable file might be covered by + * the GNU General Public License. * - * Revision 1.2 2006/02/24 01:17:05 bernie - * Update for new emulator. + * Copyright 2004, 2008 Develer S.r.l. (http://www.develer.com/) + * Copyright 1999, 2000, 2001 Bernie Innocenti + * --> * - * Revision 1.1 2005/11/27 03:06:15 bernie - * Add x86_64 task switching (to be updated to new-style scheduler). + * \author Bernie Innocenti * - * Revision 1.1 2005/11/14 21:06:38 bernie - * Add x86_64 support. + * \brief x86_64 context switch * - * Revision 1.2 2004/06/06 16:14:12 bernie - * Add DevLib license information. + * x86_64 function call convention: + * -------------------------------- + * arguments | callee-saved | extra caller-saved | return + * [callee-clobbered] | | [callee-clobbered] | + * ------------------------------------------------------------------------- + * rdi rsi rdx rcx r8-9 | rbx rbp [*] r12-15 | r10-11 | rax, rdx * - * Revision 1.1 2004/05/23 17:27:00 bernie - * Import kern/ subdirectory. + * [*] In the frame-pointers case rbp must hold a base address for the + * current stack frame. * + * asm_switch_context() can be considered as a normal function call, so we need + * to save all the callee-clobbered registers minus the return registers. */ -/* I know it's ugly... */ -/* .intel_syntax */ - -/* void AsmSwitchContext(void **new_sp, void **save_sp) */ -/* %rdi %rsi */ +/* void asm_switch_context(void **new_sp [%rdi], void **save_sp [%rsi]) */ .globl asm_switch_context asm_switch_context: - pushq %rax - pushq %rbx - pushq %rcx - pushq %rdx - pushq %rsi - pushq %rdi pushq %rbp + pushq %rdi + pushq %rsi + pushq %rcx + pushq %r8 + pushq %r9 + pushq %r10 + pushq %r11 movq %rsp,(%rsi) /* *save_sp = rsp */ movq (%rdi),%rsp /* rsp = *new_sp */ - popq %rbp - popq %rdi - popq %rsi - popq %rdx + popq %r11 + popq %r10 + popq %r9 + popq %r8 popq %rcx - popq %rbx - popq %rax - ret - -/* int asm_switch_version(void) */ -.globl asm_switch_version -asm_switch_version: - mov $1,%rax + popq %rsi + popq %rdi + popq %rbp ret -