1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)reg.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: reg.h,v 1.7 92/06/17 06:10:26 torek Exp $ 14 */ 15 16 #ifndef _MACHINE_REG_H_ 17 #define _MACHINE_REG_H_ 18 19 /* 20 * Registers passed to trap/syscall/etc. 21 * This structure is known to occupy exactly 80 bytes (see locore.s). 22 * Note, tf_global[0] is not actually written (since g0 is always 0). 23 * (The slot tf_global[0] is used to send a copy of %wim to kernel gdb. 24 * This is known as `cheating'.) 25 */ 26 struct trapframe { 27 int tf_psr; /* psr */ 28 int tf_pc; /* return pc */ 29 int tf_npc; /* return npc */ 30 int tf_y; /* %y register */ 31 int tf_global[8]; /* global registers in trap's caller */ 32 int tf_out[8]; /* output registers in trap's caller */ 33 }; 34 35 /* 36 * Register windows. Each stack pointer (%o6 aka %sp) in each window 37 * must ALWAYS point to some place at which it is safe to scribble on 38 * 64 bytes. (If not, your process gets mangled.) Furthermore, each 39 * stack pointer should be aligned on an 8-byte boundary (the kernel 40 * as currently coded allows arbitrary alignment, but with a hefty 41 * performance penalty). 42 */ 43 struct rwindow { 44 int rw_local[8]; /* %l0..%l7 */ 45 int rw_in[8]; /* %i0..%i7 */ 46 }; 47 48 #include "machine/fsr.h" 49 50 /* 51 * FP coprocessor registers. 52 * 53 * FP_QSIZE is the maximum coprocessor instruction queue depth 54 * of any implementation on which the kernel will run. David Hough: 55 * ``I'd suggest allowing 16 ... allowing an indeterminate variable 56 * size would be even better''. Of course, we cannot do that; we 57 * need to malloc these. 58 */ 59 #define FP_QSIZE 16 60 61 struct fp_qentry { 62 int *fq_addr; /* the instruction's address */ 63 int fq_instr; /* the instruction itself */ 64 }; 65 struct fpstate { 66 u_int fs_regs[32]; /* our view is 32 32-bit registers */ 67 int fs_fsr; /* %fsr */ 68 int fs_qsize; /* actual queue depth */ 69 struct fp_qentry fs_queue[FP_QSIZE]; /* queue contents */ 70 }; 71 72 #endif /* _MACHINE_REG_H_ */ 73