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2002-06-06 Chris Demetriou <cgd@broadcom.com>

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Ed Satterthwaite  <ehs@broadcom.com>

	* cp1.h: New file.
	* sim-main.h: Include cp1.h.
	(SETFCC, GETFCC, IR, UF, OF, DX, IO, UO, FP_FLAGS, FP_ENABLE)
	(FP_CAUSE, GETFS, FP_RM_NEAREST, FP_RM_TOZERO, FP_RM_TOPINF)
	(FP_RM_TOMINF, GETRM): Remove.  Moved to cp1.h.
	(FP_FS, FP_MASK_RM, FP_SH_RM, Nan, Less, Equal): Remove.
	(value_fcr, store_fcr, test_fcsr, fp_cmp): New prototypes.
	(ValueFCR, StoreFCR, TestFCSR, Compare): New macros.
	* cp1.c: Don't include sim-fpu.h; already included by
	sim-main.h.  Clean up formatting of some comments.
	(NaN, Equal, Less): Remove.
	(test_fcsr, value_fcr, store_fcr, update_fcsr, fp_test)
	(fp_cmp): New functions.
	* mips.igen (do_c_cond_fmt): Remove.
	(C.cond.fmta, C.cond.fmtb): Replace uses of do_c_cond_fmt_a with
	Compare.  Add result tracing.
	(CxC1): Remove, replace with...
	(CFC1a, CFC1b, CFC1c, CTC1a, CTC1b, CTC1c): New instructions.
	(DMxC1): Remove, replace with...
	(DMFC1a, DMFC1b, DMTC1a, DMTC1b): New instructions.
	(MxC1): Remove, replace with...
	(MFC1a, MFC1b, MTC1a, MTC1b): New instructions.
This commit is contained in:
Chris Demetriou
2002-06-07 00:13:24 +00:00
parent feb2269354
commit cfe9ea23c7
5 changed files with 473 additions and 320 deletions
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81
sim/mips/cp1.h Normal file
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/*> cp1.h <*/
/* MIPS Simulator FPU (CoProcessor 1) definitions.
Copyright (C) 1997, 1998, 2002 Free Software Foundation, Inc.
Derived from sim-main.h contributed by Cygnus Solutions,
modified substially by Broadcom Corporation (SiByte).
This file is part of GDB, the GNU debugger.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef CP1_H
#define CP1_H
/* See sim-main.h for allocation of registers FCR0 and FCR31 (FCSR)
in CPU state (struct sim_cpu), and for FPU functions. */
#define fcsr_FCC_mask (0xFE800000)
#define fcsr_FCC_shift (23)
#define fcsr_FCC_bit(cc) ((cc) == 0 ? 23 : (24 + (cc)))
#define fcsr_FS (1 << 24) /* MIPS III onwards : Flush to Zero */
#define fcsr_ZERO_mask (0x007C0000)
#define fcsr_CAUSE_mask (0x0003F000)
#define fcsr_CAUSE_shift (12)
#define fcsr_ENABLES_mask (0x00000F80)
#define fcsr_ENABLES_shift (7)
#define fcsr_FLAGS_mask (0x0000007C)
#define fcsr_FLAGS_shift (2)
#define fcsr_RM_mask (0x00000003)
#define fcsr_RM_shift (0)
/* Macros to update and retrieve the FCSR condition-code bits. This
is complicated by the fact that there is a hole in the index range
of the bits within the FCSR register. (Note that the number of bits
visible depends on the ISA in use, but that is handled elsewhere.) */
#define SETFCC(cc,v) \
do { \
(FCSR = ((FCSR & ~(1 << fcsr_FCC_bit(cc))) | ((v) << fcsr_FCC_bit(cc)))); \
} while (0)
#define GETFCC(cc) ((FCSR & (1 << fcsr_FCC_bit(cc))) != 0 ? 1 : 0)
/* Read flush-to-zero bit (not right-justified). */
#define GETFS() ((int)(FCSR & fcsr_FS))
/* FCSR flag bits definitions and access macros. */
#define IR 0 /* I: Inexact Result */
#define UF 1 /* U: UnderFlow */
#define OF 2 /* O: OverFlow */
#define DZ 3 /* Z: Division by Zero */
#define IO 4 /* V: Invalid Operation */
#define UO 5 /* E: Unimplemented Operation (CAUSE field only) */
#define FP_FLAGS(b) (1 << ((b) + fcsr_FLAGS_shift))
#define FP_ENABLE(b) (1 << ((b) + fcsr_ENABLES_shift))
#define FP_CAUSE(b) (1 << ((b) + fcsr_CAUSE_shift))
/* Rounding mode bit definitions and access macros. */
#define FP_RM_NEAREST 0 /* Round to nearest (Round). */
#define FP_RM_TOZERO 1 /* Round to zero (Trunc). */
#define FP_RM_TOPINF 2 /* Round to Plus infinity (Ceil). */
#define FP_RM_TOMINF 3 /* Round to Minus infinity (Floor). */
#define GETRM() ((FCSR >> fcsr_RM_shift) & fcsr_RM_mask)
#endif /* CP1_H */