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/*
* Copyright (c) 2017 Richard Braun.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
.section .text
.code32
.global thread_load_context
thread_load_context:
mov 4(%esp), %eax /* Load the thread address */
mov (%eax), %esp /* Switch to the thread stack */
jmp thread_restore_context
.global thread_switch_context
thread_switch_context:
mov 4(%esp), %eax /* Get prev thread address */
mov 8(%esp), %ecx /* Get next thread address */
push %ebp /* Save registers owned by the caller */
push %ebx
push %edi
push %esi
mov %esp, (%eax) /* Save prev thread stack pointer */
mov (%ecx), %esp /* Switch to the stack of the next thread */
thread_restore_context:
pop %esi
pop %edi
pop %ebx
pop %ebp
ret
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