tie-asm.h

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/*
 * This header file contains assembly-language definitions (assembly
 * macros, etc.) for this specific Xtensa processor's TIE extensions
 * and options.  It is customized to this Xtensa processor configuration.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999-2007 Tensilica Inc.
 */

#ifndef _XTENSA_CORE_TIE_ASM_H
#define _XTENSA_CORE_TIE_ASM_H

/*  Selection parameter values for save-area save/restore macros:  */
/*  Option vs. TIE:  */
#define XTHAL_SAS_TIE   0x0001  /* custom extension or coprocessor */
#define XTHAL_SAS_OPT   0x0002  /* optional (and not a coprocessor) */
/*  Whether used automatically by compiler:  */
#define XTHAL_SAS_NOCC  0x0004  /* not used by compiler w/o special opts/code */
#define XTHAL_SAS_CC    0x0008  /* used by compiler without special opts/code */
/*  ABI handling across function calls:  */
#define XTHAL_SAS_CALR  0x0010  /* caller-saved */
#define XTHAL_SAS_CALE  0x0020  /* callee-saved */
#define XTHAL_SAS_GLOB  0x0040  /* global across function calls (in thread) */
/*  Misc  */
#define XTHAL_SAS_ALL   0xFFFF  /* include all default NCP contents */



/* Macro to save all non-coprocessor (extra) custom TIE and optional state
 * (not including zero-overhead loop registers).
 * Save area ptr (clobbered):  ptr  (1 byte aligned)
 * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
 */
    .macro xchal_ncp_store  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
    xchal_sa_start	\continue, \ofs
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-8, 4, 4
    rsr	\at1, ACCLO     // MAC16 accumulator
    rsr	\at2, ACCHI
    s32i	\at1, \ptr, .Lxchal_ofs_ + 0
    s32i	\at2, \ptr, .Lxchal_ofs_ + 4
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 8
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-16, 4, 4
    rsr	\at1, M0        // MAC16 registers
    rsr	\at2, M1
    s32i	\at1, \ptr, .Lxchal_ofs_ + 0
    s32i	\at2, \ptr, .Lxchal_ofs_ + 4
    rsr	\at1, M2
    rsr	\at2, M3
    s32i	\at1, \ptr, .Lxchal_ofs_ + 8
    s32i	\at2, \ptr, .Lxchal_ofs_ + 12
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 16
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-4, 4, 4
    rsr	\at1, SCOMPARE1     // conditional store option
    s32i	\at1, \ptr, .Lxchal_ofs_ + 0
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 4
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_GLOB) & ~\select
    xchal_sa_align	\ptr, 0, 1024-4, 4, 4
    rur	\at1, THREADPTR     // threadptr option
    s32i	\at1, \ptr, .Lxchal_ofs_ + 0
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 4
    .endif
    .endm   // xchal_ncp_store

/* Macro to save all non-coprocessor (extra) custom TIE and optional state
 * (not including zero-overhead loop registers).
 * Save area ptr (clobbered):  ptr  (1 byte aligned)
 * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
 */
    .macro xchal_ncp_load  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
    xchal_sa_start	\continue, \ofs
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-8, 4, 4
    l32i	\at1, \ptr, .Lxchal_ofs_ + 0
    l32i	\at2, \ptr, .Lxchal_ofs_ + 4
    wsr	\at1, ACCLO     // MAC16 accumulator
    wsr	\at2, ACCHI
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 8
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-16, 4, 4
    l32i	\at1, \ptr, .Lxchal_ofs_ + 0
    l32i	\at2, \ptr, .Lxchal_ofs_ + 4
    wsr	\at1, M0        // MAC16 registers
    wsr	\at2, M1
    l32i	\at1, \ptr, .Lxchal_ofs_ + 8
    l32i	\at2, \ptr, .Lxchal_ofs_ + 12
    wsr	\at1, M2
    wsr	\at2, M3
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 16
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
    xchal_sa_align	\ptr, 0, 1024-4, 4, 4
    l32i	\at1, \ptr, .Lxchal_ofs_ + 0
    wsr	\at1, SCOMPARE1     // conditional store option
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 4
    .endif
    .ifeq (XTHAL_SAS_OPT | XTHAL_SAS_CC | XTHAL_SAS_GLOB) & ~\select
    xchal_sa_align	\ptr, 0, 1024-4, 4, 4
    l32i	\at1, \ptr, .Lxchal_ofs_ + 0
    wur	\at1, THREADPTR     // threadptr option
    .set    .Lxchal_ofs_, .Lxchal_ofs_ + 4
    .endif
    .endm   // xchal_ncp_load



#define XCHAL_NCP_NUM_ATMPS 2


#define XCHAL_SA_NUM_ATMPS  2

#endif /*_XTENSA_CORE_TIE_ASM_H*/