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285b64faec
after compile, the compiled code could change rsp, so use pure asm code to avoid such problem which will cause schedule switch failure. Tracked-On: #2410 Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
42 lines
988 B
ArmAsm
42 lines
988 B
ArmAsm
/*
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* Function schedule() will finally call arch_switch_to here for x86 platform, which use
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* the pointer of previous & next sched_obj->host_sp as the input parameters (rdi & rsi).
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*
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* Function arch_switch_to will save rflags, rbx, rbp, r12~r15, and rdi in the previous
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* sched_obj's stack, then switch stack pointer(rsp) from previous to next sched_obj (saved
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* in sched_obj->host_sp) and restore above registers from next sched_obj's stack.
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* It make sure the execution context return to the same point of next sched_obj when it got
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* scheduled last time.
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*/
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.text
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.code64
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.align 8
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.global arch_switch_to
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arch_switch_to:
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pushf
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pushq %rbx
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pushq %rbp
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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pushq %rdi
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movq %rsp, (%rdi)
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movq (%rsi), %rsp
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popq %rdi
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %rbp
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popq %rbx
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popf
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retq
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