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/* $OpenBSD: cpustate.h,v 1.4 2004/09/09 22:21:41 pefo Exp $ */
/*
* Copyright (c) 2002-2003 Opsycon AB (www.opsycon.se / www.opsycon.com)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define KERN_REG_SIZE (NUMSAVEREGS * REGSZ)
#define KERN_EXC_FRAME_SIZE (CF_SZ + KERN_REG_SIZE + 16)
#define SAVE_REG(reg, offs, base, bo) \
REG_S reg, bo + (REGSZ * offs) (base)
#define RESTORE_REG(reg, offs, base, bo) \
REG_L reg, bo + (REGSZ * offs) (base)
/*
* This macro saves the 'scratch' cpu state on stack.
* Macros are generic so no 'special' instructions!
* a0 will have a pointer to the 'frame' on return.
* a1 will have saved STATUS_REG on return.
* a3 will have the exception pc on 'return'.
* No traps, no interrupts if frame = k1 or k0!
* Temp regs are saved with their register number so
* branch emulation etc works properly.
*/
#define SAVE_CPU(frame, bo) \
SAVE_REG(AT, AST, frame, bo) ;\
SAVE_REG(v0, V0, frame, bo) ;\
SAVE_REG(v1, V1, frame, bo) ;\
SAVE_REG(a0, A0, frame, bo) ;\
SAVE_REG(a1, A1, frame, bo) ;\
SAVE_REG(a2, A2, frame, bo) ;\
SAVE_REG(a3, A3, frame, bo) ;\
SAVE_REG($8, T0, frame, bo) ;\
SAVE_REG($9, T1, frame, bo) ;\
SAVE_REG($10, T2, frame, bo) ;\
SAVE_REG($11, T3, frame, bo) ;\
SAVE_REG($12, T4, frame, bo) ;\
SAVE_REG($13, T5, frame, bo) ;\
SAVE_REG($14, T6, frame, bo) ;\
SAVE_REG($15 T7, frame, bo) ;\
SAVE_REG(t8, T8, frame, bo) ;\
SAVE_REG(t9, T9, frame, bo) ;\
SAVE_REG(gp, GP, frame, bo) ;\
SAVE_REG(ra, RA, frame, bo) ;\
mflo v0 ;\
mfhi v1 ;\
mfc0 a0, COP_0_CAUSE_REG ;\
mfc0 a1, COP_0_STATUS_REG ;\
mfc0 a2, COP_0_BAD_VADDR ;\
mfc0 a3, COP_0_EXC_PC ;\
SAVE_REG(v0, MULLO, frame, bo) ;\
SAVE_REG(v1, MULHI, frame, bo) ;\
SAVE_REG(a0, CAUSE, frame, bo) ;\
SAVE_REG(a1, SR, frame, bo) ;\
SAVE_REG(a2, BADVADDR, frame, bo) ;\
SAVE_REG(a3, PC, frame, bo) ;\
SAVE_REG(sp, SP, frame, bo) ;\
addu a0, frame, bo ;\
lw a2, cpl ;\
SAVE_REG(a2, CPL, frame, bo)
/*
* Save 'callee save' registers in frame to aid DDB.
*/
#define SAVE_CPU_SREG(frame, bo) \
SAVE_REG(s0, S0, frame, bo) ;\
SAVE_REG(s1, S1, frame, bo) ;\
SAVE_REG(s2, S2, frame, bo) ;\
SAVE_REG(s3, S3, frame, bo) ;\
SAVE_REG(s4, S4, frame, bo) ;\
SAVE_REG(s5, S5, frame, bo) ;\
SAVE_REG(s6, S6, frame, bo) ;\
SAVE_REG(s7, S7, frame, bo) ;\
SAVE_REG(s8, S8, frame, bo)
/*
* Restore cpu state. When called a0 = EXC_PC.
*/
#define RESTORE_CPU(frame, bo) \
RESTORE_REG(t1, SR, frame, bo) ;\
RESTORE_REG(t2, MULLO, frame, bo) ;\
RESTORE_REG(t3, MULHI, frame, bo) ;\
mtc0 t1, COP_0_STATUS_REG ;\
mtlo t2 ;\
mthi t3 ;\
dmtc0 a0, COP_0_EXC_PC ;\
RESTORE_REG(AT, AST, frame, bo) ;\
RESTORE_REG(v0, V0, frame, bo) ;\
RESTORE_REG(v1, V1, frame, bo) ;\
RESTORE_REG(a0, A0, frame, bo) ;\
RESTORE_REG(a1, A1, frame, bo) ;\
RESTORE_REG(a2, A2, frame, bo) ;\
RESTORE_REG(a3, A3, frame, bo) ;\
RESTORE_REG($8, T0, frame, bo) ;\
RESTORE_REG($9, T1, frame, bo) ;\
RESTORE_REG($10, T2, frame, bo) ;\
RESTORE_REG($11, T3, frame, bo) ;\
RESTORE_REG($12, T4, frame, bo) ;\
RESTORE_REG($13, T5, frame, bo) ;\
RESTORE_REG($14, T6, frame, bo) ;\
RESTORE_REG($15, T7, frame, bo) ;\
RESTORE_REG(t8, T8, frame, bo) ;\
RESTORE_REG(t9, T9, frame, bo) ;\
RESTORE_REG(gp, GP, frame, bo) ;\
RESTORE_REG(ra, RA, frame, bo)
/*
* Restore 'callee save' registers
*/
#define RESTORE_CPU_SREG(frame, bo) \
RESTORE_REG(s0, S0, frame, bo) ;\
RESTORE_REG(s1, S1, frame, bo) ;\
RESTORE_REG(s2, S2, frame, bo) ;\
RESTORE_REG(s3, S3, frame, bo) ;\
RESTORE_REG(s4, S4, frame, bo) ;\
RESTORE_REG(s5, S5, frame, bo) ;\
RESTORE_REG(s6, S6, frame, bo) ;\
RESTORE_REG(s7, S7, frame, bo) ;\
RESTORE_REG(s8, S8, frame, bo)
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