210 lines
5.9 KiB
C
210 lines
5.9 KiB
C
/* @(#)reg.h 1.1 86/07/07 SMI */
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/*
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* Copyright (c) 1986 by Sun Microsystems, Inc.
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*/
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/*
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modification history
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--------------------
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01a,05jun90,llk borrowed.
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*/
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#ifndef _REG_
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#define _REG_
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#ifdef I80960
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/* Intel 960 register values passed over the wire by RPC: */
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struct regs
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{
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int r_lreg[16]; /* local registers */
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int r_greg[16]; /* global registers */
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int r_pcw; /* process control word */
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int r_acw; /* arithmetic control word */
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int r_tcw; /* trace control word */
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};
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#define FP_REG_SIZE 12
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struct fp_status {
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char fps_regs[4][FP_REG_SIZE]; /* floating point regs */
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};
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#else /* For now, just 68000 */
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/*
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* Location of the users' stored
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* registers relative to R0.
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* Usage is u.u_ar0[XX].
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*/
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#define R0 (0)
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#define R1 (1)
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#define R2 (2)
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#define R3 (3)
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#define R4 (4)
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#define R5 (5)
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#define R6 (6)
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#define R7 (7)
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#define AR0 (8)
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#define AR1 (9)
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#define AR2 (10)
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#define AR3 (11)
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#define AR4 (12)
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#define AR5 (13)
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#define AR6 (14)
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#define AR7 (15)
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#define SP (15)
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#define PS (16)
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#define PC (17)
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/*
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* And now for something completely the same...
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*/
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#ifndef LOCORE
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struct regs {
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int r_dreg[8]; /* data registers */
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#define r_r0 r_dreg[0] /* r0 for portability */
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int r_areg[8]; /* address registers */
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#define r_sp r_areg[7] /* user stack pointer */
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int r_sr; /* status register (actually a short) */
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#define r_ps r_sr
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int r_pc; /* program counter */
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};
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struct stkfmt {
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int f_stkfmt : 4; /* stack format */
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int : 2;
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int f_vector : 10; /* vector offset */
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short f_beibase; /* start of bus error info (if any) */
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};
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/*
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* Struct for floating point registers and general state
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* for the MC68881 (the sky fpp has no user visible state).
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* If fps_flags == FPS_UNUSED, the other 68881 fields have no meaning.
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* fps_code and fps_flags are software implemented fields.
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* fps_flags is not used when set by user level programs,
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* but changing fps_code has the side effect of changing u.u_code.
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*/
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typedef struct ext_fp {
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int fp[3];
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} ext_fp; /* extended 96-bit 68881 fp registers */
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struct fp_status {
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ext_fp fps_regs[8]; /* 68881 floating point regs */
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int fps_control; /* 68881 control reg */
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int fps_status; /* 68881 status reg */
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int fps_iaddr; /* 68881 instruction address reg */
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int fps_code; /* additional word for signals */
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int fps_flags; /* r/o - unused, idle or busy */
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};
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#endif !LOCORE
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/*
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* Values defined for `fps_flags'.
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*/
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#define FPS_UNUSED 0 /* 68881 never used yet */
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#define FPS_IDLE 1 /* 68881 instruction completed */
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#define FPS_BUSY 2 /* 68881 instruction interrupted */
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/*
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* The EXT_FPS_FLAGS() macro is used to convert a pointer to an
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* fp_istate into a value to be used for the user visible state
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* found in fps_flags. As a speed optimization, this convertion
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* is only done is required (e.g. the PTRACE_GETFPREGS ptrace
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* call or when dumping core) instead of on each context switch.
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* The tests that we base the state on are that a fpis_vers of
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* FPIS_VERSNULL means NULL state, else a fpis_bufsiz of FPIS_IDLESZ
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* means IDLE state, else we assume BUSY state.
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*/
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#define FPIS_VERSNULL 0x0
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#define FPIS_IDLESIZE 0x18
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#define EXT_FPS_FLAGS(istatep) \
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((istatep)->fpis_vers == FPIS_VERSNULL ? FPS_UNUSED : \
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(istatep)->fpis_bufsiz == FPIS_IDLESIZE ? FPS_IDLE : FPS_BUSY)
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#ifndef LOCORE
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/*
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* Struct for the internal state of the MC68881
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* Although the MC68881 can have a smaller maximum for
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* internal state, we allow for more to allow for expansion.
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*/
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#define FPIS_BUFSIZ 0xc0
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struct fp_istate {
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unsigned char fpis_vers; /* version number */
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unsigned char fpis_bufsiz; /* size of info in fpis_buf */
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unsigned short fpis_reserved; /* reserved word */
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unsigned char fpis_buf[FPIS_BUFSIZ]; /* fpp internal state buffer */
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};
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/*
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* Structures for the status and data registers are defined here.
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* Struct fpa_status are included in the u area.
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* Struct fpa_regs is included in struct core.
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*/
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/* struct fpa_status is saved/restored during context switch */
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struct fpa_status {
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unsigned int fpas_state; /* STATE, supervisor privileged reg */
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unsigned int fpas_imask; /* IMASK */
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unsigned int fpas_load_ptr; /* LOAD_PTR */
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unsigned int fpas_ierr; /* IERR */
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unsigned int fpas_act_instr; /* pipe active instruction halves */
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unsigned int fpas_nxt_instr; /* pipe next instruction halves */
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unsigned int fpas_act_d1half;/* pipe active data first half */
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unsigned int fpas_act_d2half;/* pipe active data second half */
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unsigned int fpas_nxt_d1half;/* pipe next data first half */
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unsigned int fpas_nxt_d2half;/* pipe next data second half */
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unsigned int fpas_mode3_0; /* FPA MODE3_0 register */
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unsigned int fpas_wstatus; /* FPA WSTATUS register */
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};
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/*
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* Since there are 32 contexts supported by the FPA hardware,
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* when we do context switch on the FPA, we don't save/restore
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* the data registers between the FPA and the u area.
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* If there are already 32 processes using the fpa concurrently,
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* we give an error message to the 33rd process trying to use the fpa.
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* (Hopefully there will not be this many processes using FPA concurrently.)
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*/
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#define FPA_NCONTEXTS 32
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#define FPA_NDATA_REGS 32
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typedef struct fpa_long {
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int fpl_data[2];
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} fpa_long; /* 64 bit double precision registers */
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/* Struct fpa_regs is included in struct core. */
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struct fpa_regs {
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unsigned int fpar_flags; /* if zero, other fields are meaningless */
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struct fpa_status fpar_status;
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fpa_long fpar_data[FPA_NDATA_REGS];
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};
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/*
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* The size of struct fpa_regs is changed from 141 ints in 3.0 to
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* 77 ints in 3.x. A pad of this size difference is added to struct core.
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*/
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#define CORE_PADLEN 64
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/*
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* If there is going to be external FPU state then we must define the FPU
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* variable
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*/
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struct fpu {
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struct fp_status f_fpstatus; /* External FPP state, if any */
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struct fpa_regs f_fparegs; /* FPA registers, if any */
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int f_pad[CORE_PADLEN]; /* see comment above */
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};
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#endif !LOCORE
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#endif /* !I80960 */
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#endif !_REG_
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