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##=============================================================================
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##
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## context.S
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##
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## FR30 context switch and longjmp setjmp 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, 2007 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): larsi
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## Contributors:larsi
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## Date: 2006-06-03
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## Purpose: fr30 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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# function declaration macro
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#define FUNC_START(name) \
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.globl name; \
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name:
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#------------------------------------------------------------------------------
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# hal_thread_switch_context
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# Switch thread contexts
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#
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# a timer interrupt should have caused this function to be called
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# so interrupts are forbidden and we are in SSP mode (S flag=1)
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#
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# R4 and R5 contain our arguments.
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# R5 is _fspptr_ (old USP), R4 is _tspptr_ (new USP).
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# @(SSP) has the return address of the call to this function.
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# In @(SSP,4) the PS and in @(SSP,8) the PC are saved by hardware.
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# Before we RETI, we have to switch S flag in CCR to 0
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# to use SSP for returning. Interrupts have to be
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# reenabled before returning, but this is done by restoring PS.
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.globl hal_thread_switch_context
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hal_thread_switch_context:
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# at first switch to USP (set bit 5 in CCR in PS)
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st r0, @-r15 ; push last_trap, cannot guarantee that it is
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; the right value, but that should not matter
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; as it is only for GDB
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st mdl, @-r15
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st mdh, @-r15
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st r0, @-r15 ; store usp
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st r0, @-r15 ; store ssp
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st rp, @-r15
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st tbr, @-r15
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st ps, @-r15
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st rp, @-r15 ; rp is our new pc when load_context executes
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st r15, @-r15 ; store original r15 here
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stm1 (r8, r9, r10, r11, r12, r13, r14)
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stm0 (r0, r1, r2, r3 , r4 , r5 , r6 , r7)
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# we should be finished saving context here
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st r15, @r5 ; store pointer to saved context
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#------------------------------------------------------------------------------
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# hal_thread_load_context
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# Load thread context
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.globl hal_thread_load_context
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hal_thread_load_context:
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ld @r4, r15
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ldm0 (r0, r1, r2, r3, r4, r5, r6, r7)
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ldm1 (r8, r9, r10, r11, r12, r13, r14)
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ld @r15+, mdl
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ld @r15+, rp
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ld @r15+, ps
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ld @r15+, tbr
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# TODO addsp to skip stack positions
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ld @r15+, mdl
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ld @r15+, mdl
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ld @r15+, mdl
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ld @r15+, mdh
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ld @r15+, mdl
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addsp 4
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ret
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#------------------------------------------------------------------------------
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# HAL longjmp, setjmp implementations
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# hal_setjmp saves only to callee save registers r8, r9, r10, r11, r14, r15
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# into buffer supplied in r4
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# Note: These definitions are repeated in hal_arch.h. If changes are required
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# remember to update both sets.
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# setjmp/longjmp for FR30. The jmpbuf looks like this:
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#
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# Register jmpbuf offset
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# r8 0x00
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# r9 0x04
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# r10 0x08
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# r11 0x0c
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# r14 (FP) 0x10
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# r15 (SP) 0x14
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# pc (rp) 0x18
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.macro save reg
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st \reg, @r4
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addn #4, r4
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.endm
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.macro restore reg
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ld @r4, \reg
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addn #4, r4
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.endm
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.text
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.global hal_setjmp
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.type hal_setjmp,@function
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hal_setjmp:
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save r8
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save r9
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save r10
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save r11
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save r14
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save r15
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mov rp, r5
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st r5, @r4
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# Return 0 to caller.
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ldi:8 #0, r4
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ret
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.global hal_longjmp
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hal_longjmp:
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restore r8
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restore r9
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restore r10
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restore r11
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restore r14
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restore r15
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ld @r4, r4
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mov r4, rp
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# If caller attempted to return 0, return 1 instead.
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mov r5, r4
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or r4, r4
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bne 1f
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ldi:8 #1, r4
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1:
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ret
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#-----------------------------------------------------------------------------
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# End of context.S
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