58 lines
1.3 KiB
ArmAsm
58 lines
1.3 KiB
ArmAsm
/**
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* \file context.S
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* License details are found in the file LICENSE.
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* \brief
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* Save registers of old context and load registers of new context.
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* \author Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp> \par
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* Copyright (C) 2011 - 2012 Taku Shimosawa
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*/
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/*
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* HISTORY
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*/
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#define X86_CPU_LOCAL_OFFSET_TSS 176
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#define X86_TSS_OFFSET_SP0 4
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#define X86_CPU_LOCAL_OFFSET_SP0 \
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(X86_CPU_LOCAL_OFFSET_TSS + X86_TSS_OFFSET_SP0)
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.text
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.globl ihk_mc_switch_context
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ihk_mc_switch_context:
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/*
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* rdi - ihk_mc_kernel_context_t *old_ctx
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* rsi - ihk_mc_kernel_context_t *new_ctx
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* rdx - void *prev
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*/
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pushfq
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popq %rax
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testq %rdi, %rdi
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jz 1f /* skip saving if "old_ctx" is null. */
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movq %rbp, 8(%rdi)
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movq %rbx, 16(%rdi)
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movq %rax, 72(%rdi) /* rflags */
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movq %rsi, 24(%rdi)
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movq %rdi, 32(%rdi)
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movq %r12, 40(%rdi)
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movq %r13, 48(%rdi)
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movq %r14, 56(%rdi)
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movq %r15, 64(%rdi)
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movq %rsp, 0(%rdi)
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1:
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movq 0(%rsi), %rsp
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movq 80(%rsi), %rbp
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movq %rbp, %gs:(X86_CPU_LOCAL_OFFSET_SP0)
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movq 64(%rsi), %r15
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movq 56(%rsi), %r14
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movq 48(%rsi), %r13
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movq 40(%rsi), %r12
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movq 32(%rsi), %rdi
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movq 16(%rsi), %rbx
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movq 72(%rsi), %rax
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pushq %rax
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popfq
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movq 8(%rsi), %rbp
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movq 24(%rsi), %rsi
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movq %rdx,%rax
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retq
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