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/* SPDX-License-Identifier: GPL-2.0-only */
#if ENV_X86_64
#error COOP_MULTITASKING does not currently support x86_64
#endif
.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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