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switch.h
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/*
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Copyright (c) 1992-1993 The Regents of the University of California.
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All rights reserved. See copyright.h for copyright notice and limitation
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of liability and disclaimer of warranty provisions.
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*/
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#ifndef SWITCH_H
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#define SWITCH_H
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#include "copyright.h"
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#ifdef HOST_MIPS
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/* Registers that must be saved during a context switch.
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* These are the offsets from the beginning of the Thread object,
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* in bytes, used in switch.s
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*/
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#define SP 0
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#define S0 4
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#define S1 8
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#define S2 12
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#define S3 16
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#define S4 20
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#define S5 24
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#define S6 28
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#define S7 32
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#define FP 36
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#define PC 40
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/* To fork a thread, we set up its saved register state, so that
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* when we switch to the thread, it will start running in ThreadRoot.
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*
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* The following are the initial registers we need to set up to
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* pass values into ThreadRoot (for instance, containing the procedure
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* for the thread to run). The first set is the registers as used
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* by ThreadRoot; the second set is the locations for these initial
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* values in the Thread object -- used in Thread::AllocateStack().
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*/
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#define InitialPC s0
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#define InitialArg s1
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#define WhenDonePC s2
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#define StartupPC s3
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#define PCState (PC/4-1)
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#define FPState (FP/4-1)
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#define InitialPCState (S0/4-1)
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#define InitialArgState (S1/4-1)
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#define WhenDonePCState (S2/4-1)
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#define StartupPCState (S3/4-1)
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#endif // HOST_MIPS
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#ifdef HOST_SPARC
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/* Registers that must be saved during a context switch. See comment above. */
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#define I0 4
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#define I1 8
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#define I2 12
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#define I3 16
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#define I4 20
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#define I5 24
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#define I6 28
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#define I7 32
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/* Aliases used for clearing code. */
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#define FP I6
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#define PC I7
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/* Registers for ThreadRoot. See comment above. */
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#define InitialPC %o0
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#define InitialArg %o1
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#define WhenDonePC %o2
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#define StartupPC %o3
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#define PCState (PC/4-1)
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#define InitialPCState (I0/4-1)
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#define InitialArgState (I1/4-1)
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#define WhenDonePCState (I2/4-1)
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#define StartupPCState (I3/4-1)
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#endif // HOST_SPARC
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#ifdef HOST_SNAKE
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/* Registers that must be saved during a context switch. See comment above. */
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#define SP 0
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#define S0 4
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#define S1 8
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#define S2 12
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#define S3 16
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#define S4 20
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#define S5 24
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#define S6 28
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#define S7 32
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#define S8 36
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#define S9 40
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#define S10 44
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#define S11 48
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#define S12 52
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#define S13 56
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#define S14 60
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#define S15 64
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#define PC 68
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/* Registers for ThreadRoot. See comment above. */
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#define InitialPC %r3
/* S0 */
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#define InitialArg %r4
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#define WhenDonePC %r5
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#define StartupPC %r6
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#define PCState (PC/4-1)
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#define InitialPCState (S0/4-1)
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#define InitialArgState (S1/4-1)
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#define WhenDonePCState (S2/4-1)
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#define StartupPCState (S3/4-1)
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#endif // HOST_SNAKE
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#ifdef HOST_i386
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/* the offsets of the registers from the beginning of the thread object */
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#define _ESP 0
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#define _EAX 4
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#define _EBX 8
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#define _ECX 12
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#define _EDX 16
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#define _EBP 20
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#define _ESI 24
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#define _EDI 28
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#define _PC 32
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/* These definitions are used in Thread::AllocateStack(). */
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#define PCState (_PC/4-1)
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#define FPState (_EBP/4-1)
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#define InitialPCState (_ESI/4-1)
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#define InitialArgState (_EDX/4-1)
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#define WhenDonePCState (_EDI/4-1)
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#define StartupPCState (_ECX/4-1)
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#define InitialPC %esi
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#define InitialArg %edx
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#define WhenDonePC %edi
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#define StartupPC %ecx
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#endif
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#endif // SWITCH_H
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