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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* This program 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; version 2 of the License.
*
* 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.
*
* 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
*/
.code32
.text
/*
* stack layout after pushad:
* +------------+
* | save stack | <-- esp + 0x28
* +------------+
* | new stack | <-- esp + 0x24
* +------------+
* | ret addr | <-- esp + 0x20
* +------------+
* | eax | <-- esp + 0x1c
* +------------+
* | ecx | <-- esp + 0x18
* +------------+
* | edx | <-- esp + 0x14
* +------------+
* | ebx | <-- esp + 0x10
* +------------+
* | orig esp | <-- esp + 0x0c
* +------------+
* | ebp | <-- esp + 0x08
* +------------+
* | esi | <-- esp + 0x04
* +------------+
* | edi | <-- esp + 0x00
* +------------+
*/
.globl switch_to_thread
switch_to_thread:
pusha
/* Save the current stack */
movl 0x28(%esp), %ebx
movl %esp, (%ebx)
/* Switch to the new stack. */
movl 0x24(%esp), %eax
movl %eax, %esp
popa
ret
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