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