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##=============================================================================
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##
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## context.S
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##
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## PowerPC context switch code
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##
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##=============================================================================
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## ####ECOSGPLCOPYRIGHTBEGIN####
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## -------------------------------------------
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## This file is part of eCos, the Embedded Configurable Operating System.
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## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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##
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## eCos is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free
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## Software Foundation; either version 2 or (at your option) any later
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## version.
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##
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## eCos is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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## for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with eCos; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## As a special exception, if other files instantiate templates or use
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## macros or inline functions from this file, or you compile this file
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## and link it with other works to produce a work based on this file,
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## this file does not by itself cause the resulting work to be covered by
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## the GNU General Public License. However the source code for this file
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## must still be made available in accordance with section (3) of the GNU
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## General Public License v2.
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##
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## This exception does not invalidate any other reasons why a work based
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## on this file might be covered by the GNU General Public License.
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## -------------------------------------------
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## ####ECOSGPLCOPYRIGHTEND####
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##=============================================================================
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#######DESCRIPTIONBEGIN####
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##
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## Author(s): nickg
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## Contributors: nickg
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## Date: 1998-04-27
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## Purpose: PowerPC context switch code
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## Description: This file contains implementations of the thread context
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## switch routines. It also contains the longjmp() and setjmp()
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## routines.
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##
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######DESCRIPTIONEND####
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##
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##=============================================================================
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#include
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#include
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#include
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#------------------------------------------------------------------------------
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# Configure to use either a minimal or maximal thread state
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#ifdef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
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#define MIN_SAVE_REG 13
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#define MAX_SAVE_REG 31
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.macro save_special
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.endm
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.macro load_special
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.endm
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#else
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#define MIN_SAVE_REG 6
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#define MAX_SAVE_REG 31
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.macro save_special
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mfxer r6
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mfctr r7
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stw r6,CYGARC_PPCREG_XER(sp)
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stw r7,CYGARC_PPCREG_CTR(sp)
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.endm
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.macro load_special
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lwz r6,CYGARC_PPCREG_XER(sp)
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lwz r7,CYGARC_PPCREG_CTR(sp)
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mtxer r6
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mtctr r7
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.endm
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#endif
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#ifdef CYGHWR_HAL_POWERPC_FPU
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#ifdef CYGDBG_HAL_COMMON_CONTEXT_SAVE_MINIMUM
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#define MIN_CONTEXT_SAVE_FREG 14
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#define MAX_CONTEXT_SAVE_FREG 31
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#else
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#define MIN_CONTEXT_SAVE_FREG 0
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#define MAX_CONTEXT_SAVE_FREG 31
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#endif
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#endif
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#------------------------------------------------------------------------------
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# hal_thread_switch_context
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# Switch thread contexts
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# R3 = address of sp of next thread to execute
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# R4 = address of sp save location of current thread
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FUNC_START(hal_thread_switch_context)
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mr r5,sp # R5 = saved stack pointer
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subi sp,sp,CYGARC_PPC_CONTEXT_SIZE # space for state
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# Save registers MIN..MAX
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.set _reg,MIN_SAVE_REG
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.rept MAX_SAVE_REG+1-MIN_SAVE_REG
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stw _reg,(CYGARC_PPCREG_REGS+_reg*4)(sp)
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.set _reg,_reg+1
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.endr
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#ifdef CYGHWR_HAL_POWERPC_FPU
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# Save floating point MIN..MAX
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.set _freg, MIN_CONTEXT_SAVE_FREG
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.rept MAX_CONTEXT_SAVE_FREG+1-MIN_CONTEXT_SAVE_FREG
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stfd _freg,(CYGARC_PPCREG_FREGS+_freg*8)(sp)
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.set _freg, _freg+1
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.endr
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#endif
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stw r0,CYGARC_PPCREG_REGS+0*4(sp) # R0
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stw r5,CYGARC_PPCREG_REGS+1*4(sp) # R5 = real SP, save in R1 slot
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stw r2,CYGARC_PPCREG_REGS+2*4(sp) # R2 = TOC
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# CR cannot be treated as a special register since GCC will only
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# do partial restore of CR at function exit, depending on which
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# of CR2, CR3, and CR4 have been used in the given function.
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mfcr r5 # save CR.
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stw r5,CYGARC_PPCREG_CR(sp)
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#ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT
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# Make the thread context look like an exception context if thread-
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# aware debugging is required. This state does not need restoring.
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mflr r5
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stw r5,CYGARC_PPCREG_PC(sp) # pc of caller
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#endif
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mfmsr r5
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stw r5,CYGARC_PPCREG_MSR(sp)# msr (or PS)
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save_special # save special regs
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mflr r5 # save LR == return link for this fn
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stw r5,CYGARC_PPCREG_LR(sp)
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stw sp,0(r4) # save SP into save location
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# Now load the destination thread by dropping through
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# to hal_thread_load_context
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#------------------------------------------------------------------------------
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# hal_thread_load_context
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# Load thread context
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# R3 = address of sp of next thread to execute
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# Note that this function is also the second half of hal_thread_switch_context
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# and is simply dropped into from it.
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FUNC_START(hal_thread_load_context)
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lwz sp,0(r3) # load state directly into SP
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load_special # load special registers
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lwz r5,CYGARC_PPCREG_CR(sp) # restore CR
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mtcr r5
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lwz r5,CYGARC_PPCREG_LR(sp) # get LR as set as return link
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mtlr r5
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# Load registers MIN..MAX
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.set _reg,MIN_SAVE_REG
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.rept MAX_SAVE_REG+1-MIN_SAVE_REG
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lwz _reg,(CYGARC_PPCREG_REGS+_reg*4)(sp)
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.set _reg,_reg+1
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.endr
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#ifdef CYGHWR_HAL_POWERPC_FPU
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# Load floating registers MIN..MAX
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.set _freg, MIN_CONTEXT_SAVE_FREG
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.rept MAX_CONTEXT_SAVE_FREG+1-MIN_CONTEXT_SAVE_FREG
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lfd _freg,(CYGARC_PPCREG_FREGS+_freg*8)(sp)
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.set _freg,_freg+1
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.endr
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#endif
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lwz r3,CYGARC_PPCREG_MSR(sp) # merge interrupt state
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hal_cpu_int_merge r3,r2
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lwz r0,CYGARC_PPCREG_REGS+0*4(sp) # R0
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lwz r2,CYGARC_PPCREG_REGS+2*4(sp) # R2 = TOC
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lwz r3,CYGARC_PPCREG_REGS+3*4(sp) # load r3
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lwz sp,CYGARC_PPCREG_REGS+1*4(sp) # finally restore true SP
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blr # jump to LR
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#------------------------------------------------------------------------------
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# HAL longjmp, setjmp implementations
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# hal_setjmp saves only to callee save registers 13-31, r1[sp],r2, cr[2-4]
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# and lr into buffer supplied in r3[arg0]
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FUNC_START(hal_setjmp)
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mfcr r5
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stw r5, CYGARC_JMPBUF_CR(r3)
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mflr r5
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stw r5, CYGARC_JMPBUF_LR(r3)
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stw r31,CYGARC_JMPBUF_R31(r3)
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stw r30,CYGARC_JMPBUF_R30(r3)
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stw r29,CYGARC_JMPBUF_R29(r3)
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stw r28,CYGARC_JMPBUF_R28(r3)
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stw r27,CYGARC_JMPBUF_R27(r3)
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stw r26,CYGARC_JMPBUF_R26(r3)
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stw r25,CYGARC_JMPBUF_R25(r3)
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stw r24,CYGARC_JMPBUF_R24(r3)
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stw r23,CYGARC_JMPBUF_R23(r3)
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stw r22,CYGARC_JMPBUF_R22(r3)
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stw r21,CYGARC_JMPBUF_R21(r3)
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stw r20,CYGARC_JMPBUF_R20(r3)
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stw r19,CYGARC_JMPBUF_R19(r3)
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stw r18,CYGARC_JMPBUF_R18(r3)
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stw r17,CYGARC_JMPBUF_R17(r3)
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stw r16,CYGARC_JMPBUF_R16(r3)
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stw r15,CYGARC_JMPBUF_R15(r3)
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stw r14,CYGARC_JMPBUF_R14(r3)
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stw r13,CYGARC_JMPBUF_R13(r3)
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#ifdef CYGHWR_HAL_POWERPC_FPU
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stfd f31,CYGARC_JMPBUF_F31(r3)
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stfd f30,CYGARC_JMPBUF_F30(r3)
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stfd f29,CYGARC_JMPBUF_F29(r3)
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stfd f28,CYGARC_JMPBUF_F28(r3)
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stfd f27,CYGARC_JMPBUF_F27(r3)
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stfd f26,CYGARC_JMPBUF_F26(r3)
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stfd f25,CYGARC_JMPBUF_F25(r3)
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stfd f24,CYGARC_JMPBUF_F24(r3)
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stfd f23,CYGARC_JMPBUF_F23(r3)
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stfd f22,CYGARC_JMPBUF_F22(r3)
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stfd f21,CYGARC_JMPBUF_F21(r3)
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stfd f20,CYGARC_JMPBUF_F20(r3)
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stfd f19,CYGARC_JMPBUF_F19(r3)
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stfd f18,CYGARC_JMPBUF_F18(r3)
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stfd f17,CYGARC_JMPBUF_F17(r3)
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stfd f16,CYGARC_JMPBUF_F16(r3)
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stfd f15,CYGARC_JMPBUF_F15(r3)
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stfd f14,CYGARC_JMPBUF_F14(r3)
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#endif
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stw r2, CYGARC_JMPBUF_R2(r3) # TOC, optimize out?
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stw sp, CYGARC_JMPBUF_SP(r3)
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li r3,0 # return 0
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blr
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# hal_longjmp loads state from r3[arg0] and returns
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# to the setjmp caller with r4[arg1] as return value
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FUNC_START(hal_longjmp)
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lwz r5,CYGARC_JMPBUF_CR(r3)
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mtcr r5
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lwz r5,CYGARC_JMPBUF_LR(r3)
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mtlr r5
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lwz r31,CYGARC_JMPBUF_R31(r3)
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lwz r30,CYGARC_JMPBUF_R30(r3)
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lwz r29,CYGARC_JMPBUF_R29(r3)
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lwz r28,CYGARC_JMPBUF_R28(r3)
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lwz r27,CYGARC_JMPBUF_R27(r3)
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lwz r26,CYGARC_JMPBUF_R26(r3)
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lwz r25,CYGARC_JMPBUF_R25(r3)
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lwz r24,CYGARC_JMPBUF_R24(r3)
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lwz r23,CYGARC_JMPBUF_R23(r3)
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lwz r22,CYGARC_JMPBUF_R22(r3)
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lwz r21,CYGARC_JMPBUF_R21(r3)
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lwz r20,CYGARC_JMPBUF_R20(r3)
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lwz r19,CYGARC_JMPBUF_R19(r3)
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lwz r18,CYGARC_JMPBUF_R18(r3)
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lwz r17,CYGARC_JMPBUF_R17(r3)
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lwz r16,CYGARC_JMPBUF_R16(r3)
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lwz r15,CYGARC_JMPBUF_R15(r3)
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lwz r14,CYGARC_JMPBUF_R14(r3)
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lwz r13,CYGARC_JMPBUF_R13(r3)
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#ifdef CYGHWR_HAL_POWERPC_FPU
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lfd f31,CYGARC_JMPBUF_F31(r3)
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lfd f30,CYGARC_JMPBUF_F30(r3)
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lfd f29,CYGARC_JMPBUF_F29(r3)
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lfd f28,CYGARC_JMPBUF_F28(r3)
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lfd f27,CYGARC_JMPBUF_F27(r3)
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lfd f26,CYGARC_JMPBUF_F26(r3)
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lfd f25,CYGARC_JMPBUF_F25(r3)
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lfd f24,CYGARC_JMPBUF_F24(r3)
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lfd f23,CYGARC_JMPBUF_F23(r3)
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lfd f22,CYGARC_JMPBUF_F22(r3)
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lfd f21,CYGARC_JMPBUF_F21(r3)
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lfd f20,CYGARC_JMPBUF_F20(r3)
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lfd f19,CYGARC_JMPBUF_F19(r3)
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| 305 |
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|
lfd f18,CYGARC_JMPBUF_F18(r3)
|
| 306 |
|
|
lfd f17,CYGARC_JMPBUF_F17(r3)
|
| 307 |
|
|
lfd f16,CYGARC_JMPBUF_F16(r3)
|
| 308 |
|
|
lfd f15,CYGARC_JMPBUF_F15(r3)
|
| 309 |
|
|
lfd f14,CYGARC_JMPBUF_F14(r3)
|
| 310 |
|
|
#endif
|
| 311 |
|
|
lwz r2, CYGARC_JMPBUF_R2(r3)
|
| 312 |
|
|
lwz sp, CYGARC_JMPBUF_SP(r3)
|
| 313 |
|
|
mr r3,r4 # return r4[arg1]
|
| 314 |
|
|
blr
|
| 315 |
|
|
|
| 316 |
|
|
#------------------------------------------------------------------------------
|
| 317 |
|
|
# end of context.S
|
