163 lines
5.6 KiB
C
163 lines
5.6 KiB
C
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/* xtruntime-frames.h - exception stack frames for single-threaded run-time */
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/* $Id: //depot/rel/Eaglenest/Xtensa/OS/include/xtensa/xtruntime-frames.h#1 $ */
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/*
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* Copyright (c) 2002-2012 Tensilica Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _XTRUNTIME_FRAMES_H_
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#define _XTRUNTIME_FRAMES_H_
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#include <xtensa/config/core.h>
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/* Macros that help define structures for both C and assembler: */
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#if defined(_ASMLANGUAGE) || defined(__ASSEMBLER__)
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#define STRUCT_BEGIN .pushsection .text; .struct 0
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#define STRUCT_FIELD(ctype,size,pre,name) pre##name: .space size
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#define STRUCT_AFIELD(ctype,size,pre,name,n) pre##name: .if n ; .space (size)*(n) ; .endif
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#define STRUCT_AFIELD_A(ctype,size,align,pre,name,n) .balign align ; pre##name: .if n ; .space (size)*(n) ; .endif
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#define STRUCT_END(sname) sname##Size:; .popsection
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#else /*_ASMLANGUAGE||__ASSEMBLER__*/
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#define STRUCT_BEGIN typedef struct {
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#define STRUCT_FIELD(ctype,size,pre,name) ctype name;
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#define STRUCT_AFIELD(ctype,size,pre,name,n) ctype name[n];
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#define STRUCT_AFIELD_A(ctype,size,align,pre,name,n) ctype name[n] __attribute__((aligned(align)));
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#define STRUCT_END(sname) } sname;
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#endif /*_ASMLANGUAGE||__ASSEMBLER__*/
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/*
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* Kernel vector mode exception stack frame.
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*
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* NOTE: due to the limited range of addi used in the current
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* kernel exception vector, and the fact that historically
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* the vector is limited to 12 bytes, the size of this
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* stack frame is limited to 128 bytes (currently at 64).
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*/
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STRUCT_BEGIN
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STRUCT_FIELD (long,4,KEXC_,pc) /* "parm" */
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STRUCT_FIELD (long,4,KEXC_,ps)
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STRUCT_AFIELD(long,4,KEXC_,areg, 4) /* a12 .. a15 */
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STRUCT_FIELD (long,4,KEXC_,sar) /* "save" */
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#if XCHAL_HAVE_LOOPS
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STRUCT_FIELD (long,4,KEXC_,lcount)
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STRUCT_FIELD (long,4,KEXC_,lbeg)
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STRUCT_FIELD (long,4,KEXC_,lend)
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#endif
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#if XCHAL_HAVE_MAC16
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STRUCT_FIELD (long,4,KEXC_,acclo)
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STRUCT_FIELD (long,4,KEXC_,acchi)
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STRUCT_AFIELD(long,4,KEXC_,mr, 4)
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#endif
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STRUCT_END(KernelFrame)
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/*
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* User vector mode exception stack frame:
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*
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* WARNING: if you modify this structure, you MUST modify the
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* computation of the pad size (ALIGNPAD) accordingly.
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*/
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STRUCT_BEGIN
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STRUCT_FIELD (long,4,UEXC_,pc)
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STRUCT_FIELD (long,4,UEXC_,ps)
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STRUCT_FIELD (long,4,UEXC_,sar)
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STRUCT_FIELD (long,4,UEXC_,vpri)
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#ifdef __XTENSA_CALL0_ABI__
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STRUCT_FIELD (long,4,UEXC_,a0)
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#endif
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STRUCT_FIELD (long,4,UEXC_,a2)
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STRUCT_FIELD (long,4,UEXC_,a3)
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STRUCT_FIELD (long,4,UEXC_,a4)
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STRUCT_FIELD (long,4,UEXC_,a5)
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#ifdef __XTENSA_CALL0_ABI__
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STRUCT_FIELD (long,4,UEXC_,a6)
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STRUCT_FIELD (long,4,UEXC_,a7)
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STRUCT_FIELD (long,4,UEXC_,a8)
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STRUCT_FIELD (long,4,UEXC_,a9)
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STRUCT_FIELD (long,4,UEXC_,a10)
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STRUCT_FIELD (long,4,UEXC_,a11)
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STRUCT_FIELD (long,4,UEXC_,a12)
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STRUCT_FIELD (long,4,UEXC_,a13)
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STRUCT_FIELD (long,4,UEXC_,a14)
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STRUCT_FIELD (long,4,UEXC_,a15)
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#endif
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STRUCT_FIELD (long,4,UEXC_,exccause) /* NOTE: can probably rid of this one (pass direct) */
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#if XCHAL_HAVE_LOOPS
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STRUCT_FIELD (long,4,UEXC_,lcount)
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STRUCT_FIELD (long,4,UEXC_,lbeg)
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STRUCT_FIELD (long,4,UEXC_,lend)
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#endif
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#if XCHAL_HAVE_MAC16
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STRUCT_FIELD (long,4,UEXC_,acclo)
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STRUCT_FIELD (long,4,UEXC_,acchi)
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STRUCT_AFIELD(long,4,UEXC_,mr, 4)
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#endif
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/* ALIGNPAD is the 16-byte alignment padding. */
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#ifdef __XTENSA_CALL0_ABI__
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# define CALL0_ABI 1
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#else
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# define CALL0_ABI 0
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#endif
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#define ALIGNPAD ((3 + XCHAL_HAVE_LOOPS*1 + XCHAL_HAVE_MAC16*2 + CALL0_ABI*1) & 3)
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#if ALIGNPAD
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STRUCT_AFIELD(long,4,UEXC_,pad, ALIGNPAD) /* 16-byte alignment padding */
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#endif
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/*STRUCT_AFIELD_A(char,1,XCHAL_CPEXTRA_SA_ALIGN,UEXC_,ureg, (XCHAL_CPEXTRA_SA_SIZE+3)&-4)*/ /* not used */
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STRUCT_END(UserFrame)
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#if defined(_ASMLANGUAGE) || defined(__ASSEMBLER__)
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/* Check for UserFrameSize small enough not to require rounding...: */
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/* Skip 16-byte save area, then 32-byte space for 8 regs of call12
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* (which overlaps with 16-byte GCC nested func chaining area),
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* then exception stack frame: */
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.set UserFrameTotalSize, 16+32+UserFrameSize
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/* Greater than 112 bytes? (max range of ADDI, both signs, when aligned to 16 bytes): */
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.ifgt UserFrameTotalSize-112
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/* Round up to 256-byte multiple to accelerate immediate adds: */
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.set UserFrameTotalSize, ((UserFrameTotalSize+255) & 0xFFFFFF00)
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.endif
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# define ESF_TOTALSIZE UserFrameTotalSize
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#endif /* _ASMLANGUAGE || __ASSEMBLER__ */
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#if XCHAL_NUM_CONTEXTS > 1
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/* Structure of info stored on new context's stack for setup: */
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STRUCT_BEGIN
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STRUCT_FIELD (long,4,INFO_,sp)
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STRUCT_FIELD (long,4,INFO_,arg1)
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STRUCT_FIELD (long,4,INFO_,funcpc)
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STRUCT_FIELD (long,4,INFO_,prevps)
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STRUCT_END(SetupInfo)
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#endif
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#define KERNELSTACKSIZE 1024
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#endif /* _XTRUNTIME_FRAMES_H_ */
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