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107 lines
2.1 KiB
ArmAsm
107 lines
2.1 KiB
ArmAsm
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: ntoskrnl/ke/arm/ctxswtch.s
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* PURPOSE: Context Switch and Idle Thread on ARM
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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.title "ARM Context Switching"
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.include "ntoskrnl/include/internal/arm/kxarm.h"
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.include "ntoskrnl/include/internal/arm/ksarm.h"
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TEXTAREA
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NESTED_ENTRY KiSwapContext
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PROLOG_END KiSwapContext
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//
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// a1 = Old Thread
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// a2 = New Thread
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//
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//
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// Make space for the trap frame
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//
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sub sp, sp, #ExceptionFrameLength
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//
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// Build exception frame
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// FIXME-PERF: Change to stmdb later
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//
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str r4, [sp, #ExR4]
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str r5, [sp, #ExR5]
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str r6, [sp, #ExR6]
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str r7, [sp, #ExR7]
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str r8, [sp, #ExR8]
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str r9, [sp, #ExR9]
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str r10, [sp, #ExR10]
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str r11, [sp, #ExR11]
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str lr, [sp, #ExLr]
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mrs r4, spsr_all
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str r4, [sp, #ExSpsr]
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//
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// Switch stacks
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//
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str sp, [a1, #ThKernelStack]
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ldr sp, [a2, #ThKernelStack]
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//
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// Call the C context switch code
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//
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bl KiSwapContextInternal
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//
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// Get the SPSR and restore it
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//
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ldr r4, [sp, #ExSpsr]
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msr spsr_all, r4
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//
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// Restore the registers
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// FIXME-PERF: Use LDMIA later
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//
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ldr r4, [sp, #ExR4]
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ldr r5, [sp, #ExR5]
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ldr r6, [sp, #ExR6]
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ldr r7, [sp, #ExR7]
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ldr r8, [sp, #ExR8]
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ldr r9, [sp, #ExR9]
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ldr r10, [sp, #ExR10]
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ldr r11, [sp, #ExR11]
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ldr lr, [sp, #ExLr]
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//
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// Restore stack
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//
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add sp, sp, #ExceptionFrameLength
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//
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// Jump to saved restore address
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//
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mov pc, lr
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ENTRY_END KiSwapContext
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NESTED_ENTRY KiThreadStartup
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PROLOG_END KiThreadStartup
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//
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// Lower to APC_LEVEL
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//
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mov a1, #1
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bl KeLowerIrql
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//
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// Set the start address and startup context
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//
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mov a1, r6
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mov a2, r5
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blx r7
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//
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// Oh noes, we are back!
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//
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b .
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ENTRY_END KiThreadStartup
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