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Basic 8052 context switching is working 

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@39 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2007-03-06 21:34:32 +00:00
parent 0d1bcd8e1a
commit 8b000cffe3
14 changed files with 537 additions and 232 deletions
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11
nuttx/arch/pjrc-8051/sdcc-2.6.0.patch Normal file
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@ -0,0 +1,11 @@
--- sdcc/device/lib/Makefile.orig 2007-03-06 09:55:01.000000000 -0600
+++ sdcc/device/lib/Makefile 2007-03-06 09:58:32.000000000 -0600
@@ -242,7 +242,7 @@
model-mcs51-stack-auto:
if [ "`grep mcs51 $(top_builddir)ports.build`" = mcs51 ]; then \
for model in $(MODELS); do \
- $(MAKE) MODELFLAGS="--model-$$model --stack-auto" PORT=$$model PORTDIR=$(BUILDDIR)/$$model-stack-auto PORTINCDIR=$(INCDIR)/mcs51 objects; \
+ $(MAKE) MODELFLAGS="--model-$$model --stack-auto --int-long-reent --float-reent" PORT=$$model PORTDIR=$(BUILDDIR)/$$model-stack-auto PORTINCDIR=$(INCDIR)/mcs51 objects; \
done \
fi

6
nuttx/arch/pjrc-8051/src/Makefile
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@ -48,12 +48,12 @@ CSRCS = up_initialize.c up_idle.c up_interruptcontext.c \
up_releasepending.c up_reprioritizertr.c \
up_exit.c up_assert.c up_allocateheap.c \
up_irq.c up_savecontext.c up_restorecontext.c \
up_timerisr.c up_putc.c
up_timerisr.c up_putc.c up_debug.c
COBJS = $(CSRCS:.c=$(OBJEXT))
SRCS = $(SSRCS) $(CSRCS)
OBJS = $(AOBJS) $(COBJS)
SDCCLIBDIR = /usr/local/share/sdcc/lib/large
SDCCLIBDIR = /usr/local/share/sdcc/lib/large-stack-auto
SDCCPATH = -L$(SDCCLIBDIR)
SDCCLIBS = -llibfloat.lib -llibint.lib -lliblong.lib -llibmysdcc.lib -lmcs51.lib
@ -66,7 +66,7 @@ LDLIBS = $(addprefix -l,$(notdir $(LINKLIBS)))
LDFLAGS = --model-large --nostdlib \
--data-loc 0x30 --iram-size 0x100 \
--code-loc 0x20c0 --code-size 0x5f40 \
--code-loc 0x2100 --code-size 0x5f40 \
--xram-loc 0x0100 --xram-size 0x1f00
DEPSRCS = $(SRCS) $(LINKSSRCS)

7
nuttx/arch/pjrc-8051/src/up_assert.c
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@ -42,6 +42,9 @@
#include <stdlib.h>
#include <assert.h>
#include <debug.h>
#include <8052.h>
#include "up_internal.h"
#include "up_mem.h"
/************************************************************
* Definitions
@ -56,7 +59,7 @@
************************************************************/
/************************************************************
* Public Funtions
* Public Functions
************************************************************/
/************************************************************
@ -66,6 +69,7 @@
void up_assert(void)
{
dbg("Assertion failed\n");
up_dumpstack();
exit(EXIT_FAILURE);
}
@ -76,5 +80,6 @@ void up_assert(void)
void up_assert_code(int errorcode)
{
dbg("Assertion failed with error code: %d\n", errorcode);
up_dumpstack();
exit(errorcode);
}

8
nuttx/arch/pjrc-8051/src/up_blocktask.c
View File

@ -131,7 +131,7 @@ void up_block_task(FAR _TCB *tcb, tstate_t task_state)
* Just copy the current registers into the OLD rtcb.
*/
up_savestack(&tcb->xcp);
up_savestack(&tcb->xcp, g_irqtos);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
@ -140,9 +140,11 @@ void up_block_task(FAR _TCB *tcb, tstate_t task_state)
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
up_restorestack(&tcb->xcp);
g_irqcontext = &rtcb->xcp;
}
/* Copy the user C context into the TCB at the (old) head of the

162
nuttx/arch/pjrc-8051/src/up_debug.c Normal file
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@ -0,0 +1,162 @@
/************************************************************
* up_assert.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <debug.h>
#include <8052.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include "up_internal.h"
#include "up_mem.h"
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Data
************************************************************/
/************************************************************
* Private Functions
************************************************************/
#ifdef CONFIG_FRAME_DUMP
static void _up_puthex(ubyte hex) __naked
{
hex; /* To avoid unreferenced argument warning */
_asm
mov a, dpl
ljmp PM2_ENTRY_PHEX
_endasm;
}
static void _up_putspace(void) __naked
{
_asm
mov a, #0x20
ljmp PM2_ENTRY_COUT
_endasm;
}
static void _up_putcolon(void) __naked
{
_asm
mov a, #0x3a
lcall PM2_ENTRY_COUT
_endasm;
}
static void _up_putnl(void) __naked
{
_asm
ljmp PM2_ENTRY_NEWLINE
_endasm;
}
static void _up_puts(__code char *ptr)
{
for (; *ptr; ptr++)
{
up_putc(*ptr);
}
}
static void _up_dump16(__code char *ptr, ubyte msb, ubyte lsb)
{
_up_puts(ptr);
_up_puthex(msb);
_up_puthex(lsb);
_up_putnl();
}
static void _up_dump8(__code char *ptr, ubyte b)
{
_up_puts(ptr);
_up_puthex(b);
_up_putnl();
}
#endif
/************************************************************
* Public Functions
************************************************************/
/************************************************************
* Name: up_dumpstack
************************************************************/
#ifdef CONFIG_FRAME_DUMP
void up_dumpstack(void)
{
NEAR ubyte *start = (NEAR ubyte *)(UP_STACK_BASE & 0xf0);
NEAR ubyte *end = (NEAR ubyte *)SP;
ubyte i;
while (start < end)
{
_up_puthex((ubyte)start);
_up_putcolon();
for (i = 0; i < 8; i++)
{
_up_putspace();
_up_puthex(*start);
start++;
}
_up_putnl();
}
}
#endif
/************************************************************
* Name: up_dumpframe
************************************************************/
#ifdef CONFIG_FRAME_DUMP
void up_dumpframe(FAR struct xcptcontext *context)
{
FAR ubyte *start = &context->stack[context->nbytes - FRAME_SIZE];
_up_dump16(" RET ", start[FRAME_RETMS], start[FRAME_RETLS]);
_up_dump8(" IE ", start[FRAME_IE]);
_up_dump16(" DPTR ", start[FRAME_DPH], start[FRAME_DPL]);
_up_dump8(" PSW ", start[FRAME_PSW]);
}
#endif

159
nuttx/arch/pjrc-8051/src/up_head.S
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@ -55,6 +55,7 @@
************************************************************/
.globl _g_irqtos
.globl _g_irqcontext
/************************************************************
* Public Functions
@ -167,18 +168,36 @@ _up_interrupt:
clr psw
push _bp
/* Mark that we are in an interrupt */
/* Save the IRQ number in r3 */
mov r2, a
/* Mark that we are in an interrupt and provide the top
* of stack pointer to the context switching logic.
*/
mov dptr, #_g_irqtos
mov a, sp
movx @dptr, a
/* Nullify the context pointer. If a context switch is
* needed, this will be set to the address of the context
* structure.
*/
mov dptr,#_g_irqcontext
clr a
movx @dptr,a
inc dptr
movx @dptr,a
/* Now call void irq_dispatch(int irq, FAR void *context)
*
* First, create the first argument as (int)irqno
*/
mov dpl, a
clr dph
mov dpl, r2
mov dph, #0
/* Create the second argument (void *context) on the stack */
@ -186,30 +205,120 @@ _up_interrupt:
clr a
push acc
/* Then dispatch the IRQ. On return, the stack is off by
* by two because the above two pushes, but we fix that by
* reloading sp from g_irqtos below.
*/
/* Then dispatch the IRQ. */
lcall _irq_dispatch
/* Get the stackpointer. This might be the stack pointer that
* we increment above or it might be the stack pointer of a
* new task if the a context switch happened during the
* interrupt handling.
*/
mov dptr, #_g_irqtos
movx a, @dptr
mov sp, a
pop acc
pop acc
/* Indicate that we are no longer in an interrupt */
mov dptr, #_g_irqtos
clr a
movx @dptr, a
/* Check if a context switch is pending */
mov dptr,#_g_irqcontext
movx a, @dptr
mov r2, a
inc dptr
movx a, @dptr
mov r3, a
orl a, r2
jz 00003$
/* A conext switch is pending Clear g_irqcontext */
mov dpl, r2
mov dph, r3
clr a
movx @dptr, a
inc dptr
movx @dptr, a
/* Then return from the interrupt */
#ifdef CONFIG_INTERRUPT_FRAME_DUMP
mov dpl, r2
mov dph, r3
push ar2
push ar3
lcall _up_dumpframe
pop ar3
pop ar2
#endif
/* Register usage in the following:
*
* R0 - Holds working the 8-bit IRAM pointer
* R1 - Not used
* R2-3 - Holds the working 16-bit XRAM pointer
* R4 - Holds the working byte count
* R5 - Holds the new stack pointer
* R6-7 - Not used
*/
/* Fetch r4 = context->nbytes */
mov dpl, r2
mov dph, r3
movx a, @dptr
mov r4, a
/* Save the new stack pointer in r5 */
add a, #(STACK_BASE-1)
mov r5, a
/* Save r2-3 = &context->stack */
inc dptr
mov r2, dpl
mov r3, dph
/* Set r0 = stack base address */
mov r0, #STACK_BASE
/* Top of the copy loop */
00001$:
dec r4
jz 00002$
/* Fetch the next byte from context->stack */
mov dpl, r2
mov dph, r3
movx a,@dptr
/* Increment the XRAM pointer */
inc dptr
mov r2, dpl
mov r3, dph
/* Save the next byte into IRAM */
mov @r0, a
/* Increment the IRAM pointer */
inc r0
sjmp 00001$
/* Set the new stack pointer */
00002$:
mov sp, r5
#ifdef CONFIG_INTERRUPT_FRAME_DUMP
lcall _up_dumpstack
#endif
/* Then restore the context from the stack and return
* from the interrupt
*/
00003$:
pop _bp
pop psw
pop ar1
@ -223,18 +332,6 @@ _up_interrupt:
pop b
pop dph
pop dpl
/* Restore the interrupt state per the stored IE value */
pop ie
pop acc
jb acc.7, 00001$
clr ie.7
sjmp 00002$
00001$:
setb ie.7
00002$:
/* Finally pop off the ACC, which was the first register saved. */
pop acc
reti

20
nuttx/arch/pjrc-8051/src/up_initialize.c
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@ -51,14 +51,24 @@
* Private Data
************************************************************/
/* This is the top of the stack containing the interrupt stack frame. It
* is set when processing an interrupt. It is also cleared when the
* interrupt returns so this can also be used like a boolean indication that
* we are in an interrupt.
/* This is the top of the stack containing the interrupt
* stack frame. It is set when processing an interrupt. It
* is also cleared when the interrupt returns so this can
* also be used like a boolean indication that we are in an
* interrupt.
*/
ubyte g_irqtos;
/* If during execution of an interrup handler, a context
* switch must be performed, the follwing will be set to
* to that address of the relevant context structure. The
* actual switch will be deferred until the time that the
* the interrupt exits.
*/
FAR struct xcptcontext *g_irqcontext;
/************************************************************
* Private Functions
************************************************************/
@ -105,7 +115,9 @@ void up_initialize(void)
/* Initialize the system timer interrupt */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
up_timerinit();
#endif
/* Initialize the serial console support */
}

40
nuttx/arch/pjrc-8051/src/up_internal.h
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@ -44,6 +44,13 @@
* Public Definitions
**************************************************************************/
/* Bring-up debug configurations */
#define CONFIG_FRAME_DUMP 1 /* Enabled stack/frame dumping logic */
#define CONFIG_SUPPRESS_INTERRUPTS 1 /* Do not enable interrupts */
#define CONFIG_SWITCH_FRAME_DUMP 1 /* Dump frames from normal switches */
#undef CONFIG_INTERRUPT_FRAME_DUMP /* Dump frames from interrupt switches */
/* Memory Map
*
* BEGIN END DESCRIPTION
@ -161,14 +168,24 @@ sfr at 0xc9 T2MOD ;
#ifndef __ASSEMBLY__
/* This is the top of the stack containing the interrupt stack frame. It
* is set when processing an interrupt. It is also cleared when the
* interrupt returns so this can also be used like a boolean indication that
* we are in an interrupt.
/* This is the top of the stack containing the interrupt
* stack frame. It is set when processing an interrupt. It
* is also cleared when the interrupt returns so this can
* also be used like a boolean indication that we are in an
* interrupt.
*/
extern ubyte g_irqtos;
/* If during execution of an interrup handler, a context
* switch must be performed, the follwing will be set to
* to that address of the relevant context structure. The
* actual switch will be deferred until the time that the
* the interrupt exits.
*/
extern FAR struct xcptcontext *g_irqcontext;
#endif /* __ASSEMBLY */
/**************************************************************************
@ -181,11 +198,18 @@ extern ubyte g_irqtos;
extern void up_addregion(void);
#endif
extern void up_irqinitialize(void);
extern void up_restorecontext(FAR struct xcptcontext *context);
extern void up_restorestack(FAR struct xcptcontext *context);
extern ubyte up_savecontext(FAR struct xcptcontext *context);
extern void up_savestack(FAR struct xcptcontext *context);
extern void up_restorecontext(FAR struct xcptcontext *context) _naked;
extern ubyte up_savecontext(FAR struct xcptcontext *context) __naked;
extern void up_savestack(FAR struct xcptcontext *context, ubyte tos);
extern void up_timerinit(void);
#ifdef CONFIG_FRAME_DUMP
extern void up_dumpstack(void);
extern void up_dumpframe(FAR struct xcptcontext *context);
#else
# define up_dumpstack()
# define up_dumpframe(x)
#endif
#endif /* __ASSEMBLY */
#endif /* __ARCH_UP_INTERNAL_H */

4
nuttx/arch/pjrc-8051/src/up_irq.c
View File

@ -69,7 +69,9 @@
void up_irqinitialize(void)
{
#if 1 /* remove me */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
/* Disable all interrupts */
IE = 0;
#else
/* Enable interrupts globally, but disable all interrupt

8
nuttx/arch/pjrc-8051/src/up_releasepending.c
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@ -94,7 +94,7 @@ void up_release_pending(void)
* Just copy the current registers into the OLD rtcb.
*/
up_savestack(&rtcb->xcp);
up_savestack(&rtcb->xcp, g_irqtos);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
@ -103,9 +103,11 @@ void up_release_pending(void)
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
up_restorestack(&rtcb->xcp);
g_irqcontext = &rtcb->xcp;
}
/* Copy the exception context into the TCB of the task that

8
nuttx/arch/pjrc-8051/src/up_reprioritizertr.c
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@ -142,7 +142,7 @@ void up_reprioritize_rtr(FAR _TCB *tcb, ubyte priority)
* Just copy the current registers into the OLD rtcb.
*/
up_savestack(&tcb->xcp);
up_savestack(&tcb->xcp, g_irqtos);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
@ -151,9 +151,11 @@ void up_reprioritize_rtr(FAR _TCB *tcb, ubyte priority)
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
up_restorestack(&tcb->xcp);
g_irqcontext = &tcb->xcp;
}
/* Copy the exception context into the TCB at the (old) head of the

205
nuttx/arch/pjrc-8051/src/up_restorecontext.c
View File

@ -64,55 +64,6 @@
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_popcontext
*
* Description:
* Pop the current execution context from the stack and return to the
* execution context. Similar operations are executed from the interrupt
* state restore
*
* Inputs:
* None
*
* Return:
* This function does not return
*
**************************************************************************/
static void up_popcontext(ubyte newsp) __naked
{
_asm
pop _bp
pop psw
pop ar1
pop ar0
pop ar7
pop ar6
pop ar5
pop ar4
pop ar3
pop ar2
pop b
pop dph
pop dpl
/* Restore the interrupt state per the stored IE value */
pop acc
jb acc.7,00001$
clr ie.7
sjmp 00002$
00001$:
setb ie.7
00002$:
pop acc
ret
_endasm;
}
/**************************************************************************
* Public Functions
**************************************************************************/
@ -132,67 +83,125 @@ static void up_popcontext(ubyte newsp) __naked
*
**************************************************************************/
void up_restorecontext(FAR struct xcptcontext *context)
void up_restorecontext(FAR struct xcptcontext *context) __naked
{
int nbytes = context->nbytes;
FAR ubyte *src = context->stack;
NEAR ubyte *dest = (NEAR ubyte*)STACK_BASE;
_asm
ar2 = 0x02
ar3 = 0x03
ar4 = 0x04
ar5 = 0x05
ar6 = 0x06
ar7 = 0x07
ar0 = 0x00
ar1 = 0x01
/* Interrupts should be disabled for the following. up_popcontext() will
* set the new interrupt state correctly.
*/
#ifdef CONFIG_SWITCH_FRAME_DUMP
push dpl
push dph
lcall _up_dumpframe
pop dph
pop dpl
#endif
(void)irqsave();
/* Interrupts should be disabled for the following. up_popcontext() will
* set the new interrupt state correctly.
*/
while (nbytes--)
{
*src++ = *dest++;
}
clr ea
/* Then return to the restored context (probably restoring interrupts) */
/* Register usage in the following:
*
* R0 - Holds working the 8-bit IRAM pointer
* R1 - Not used
* R2-3 - Holds the working 16-bit XRAM pointer
* R4 - Holds the working byte count
* R5 - Holds the new stack pointer
* R6-7 - Not used
*/
up_popcontext(context->nbytes + (STACK_BASE-1));
}
/* Fetch r4 = context->nbytes */
/**************************************************************************
* Name: up_restorestack
*
* Description:
* Restore the entire interrupt stack contents in the provided context
* structure.
*
* Inputs:
* context - the context structure from which to restore the stack info
*
* Return:
* None
*
* Assumptions:
* - We are in an interrupt handler with g_irqtos set
* - Interrupts are disabled
*
**************************************************************************/
movx a, @dptr
mov r4, a
void up_restorestack(FAR struct xcptcontext *context)
{
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
/* Save the new stack pointer in r5 */
ubyte nbytes = context->nbytes;
FAR ubyte *src = context->stack;
NEAR ubyte *dest = (NEAR ubyte*)STACK_BASE;
add a, #(STACK_BASE-1)
mov r5, a
while (nbytes--)
{
*dest++ = *src++;
}
/* Save r2-3 = &context->stack */
/* We are still in the interrupt context, but the size of the interrupt
* stack has changed.
*/
inc dptr
mov r2, dpl
mov r3, dph
g_irqtos = context->nbytes + (STACK_BASE-1);
/* Set r0 = stack base address */
mov r0, #STACK_BASE
/* Top of the copy loop */
00001$:
dec r4
jz 00002$
/* Fetch the next byte from context->stack */
mov dpl, r2
mov dph, r3
movx a,@dptr
/* Increment the XRAM pointer */
inc dptr
mov r2, dpl
mov r3, dph
/* Save the next byte into IRAM */
mov @r0, a
/* Increment the IRAM pointer */
inc r0
sjmp 00001$
00002$:
/* Set the new stack pointer */
mov sp, r5
#ifdef CONFIG_SWITCH_FRAME_DUMP
lcall _up_dumpstack
#endif
/* Then restore the context from the stack */
pop _bp
pop psw
pop ar1
pop ar0
pop ar7
pop ar6
pop ar5
pop ar4
pop ar3
pop ar2
pop b
pop dph
pop dpl
/* Restore the interrupt state per the stored IE value */
pop acc
jb acc.7,00003$
clr ie.7
sjmp 00004$
00003$:
setb ie.7
00004$:
pop acc
ret
_endasm;
}

123
nuttx/arch/pjrc-8051/src/up_savecontext.c
View File

@ -65,53 +65,6 @@
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_pushcontext
*
* Description:
* Push the current execution context onto the before the stack. Similar
* operations are executed from the interrupt state save.
*
* Inputs:
* None
*
* Return:
* Returns the stack pointer (always non-zero). However, when
* up_popcontext() executes, it will appear as a return from this
* function with return value == 0
*
**************************************************************************/
static ubyte up_pushcontext(void) __naked
{
/* Push the current execution context onto the stack. */
_asm
push acc
push ie
mov dptr, #0 /* Save return value (dpl) = 0 */
push dpl
push dph
push b
push ar2
push ar3
push ar4
push ar5
push ar6
push ar7
push ar0
push ar1
push psw
clr psw
push _bp
/* And return the current stack pointer value in dpl */
mov dpl, sp
ret
_endasm;
}
/**************************************************************************
* Public Functions
**************************************************************************/
@ -132,38 +85,61 @@ static ubyte up_pushcontext(void) __naked
*
**************************************************************************/
ubyte up_savecontext(FAR struct xcptcontext *context)
ubyte up_savecontext(FAR struct xcptcontext *context) _naked
{
irqstate_t flags = irqsave();
ubyte sp = up_pushcontext();
if (sp)
{
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
_asm
/* Create the stack frame that we want when it is time to restore
* this* context. The return address will be the return address
* of this function, the return value will be zero.
*/
ubyte nbytes = sp - (STACK_BASE-1);
NEAR ubyte *src = (NEAR ubyte*)STACK_BASE;
FAR ubyte *dest = context->stack;
clr a
push acc /* ACC = 0 */
push ie
mov a, #1
push acc /* DPL = 1 */
clr a
push acc /* DPH = 0 */
push b
push ar2
push ar3
push ar4
push ar5
push ar6
push ar7
push ar0
push ar1
push psw
clr psw
push _bp
/* Then copy the stack info into the context structure */
/* Disable interrupts while we create a snapshot of the stack */
context->nbytes = nbytes;
while (nbytes--)
{
*dest++ = *src++;
}
push ie
mov ea, 0
/* Return zero so that the return behavior is similar to setjmp */
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
irqrestore(flags);
return 0;
}
push sp
lcall _up_savestack
pop acc
/* Return one so that the return behavior is similar to setjmp */
/* Restore the interrupt state */
irqrestore(flags);
return 1;
pop ie
/* Now that we have a snapshot of the desired stack frame saved,
* restore the correct stackpointer.
*/
mov a, sp
subb a, #15
mov sp, a
mov dpl,#0
ret
_endasm;
}
/**************************************************************************
@ -180,18 +156,17 @@ ubyte up_savecontext(FAR struct xcptcontext *context)
* None
*
* Assumptions:
* - We are in an interrupt handler with g_irqtos set
* - Interrupts are disabled
*
**************************************************************************/
void up_savestack(FAR struct xcptcontext *context)
void up_savestack(FAR struct xcptcontext *context, ubyte tos)
{
/* Now copy the current stack frame (including the saved execution
* context) from internal RAM to XRAM.
*/
ubyte nbytes = g_irqtos - (STACK_BASE-1);
ubyte nbytes = tos - (STACK_BASE-1);
NEAR ubyte *src = (NEAR ubyte*)STACK_BASE;
FAR ubyte *dest = context->stack;

8
nuttx/arch/pjrc-8051/src/up_unblocktask.c
View File

@ -122,7 +122,7 @@ void up_unblock_task(FAR _TCB *tcb)
* Just copy the current stack into the OLD rtcb.
*/
up_savestack(&rtcb->xcp);
up_savestack(&rtcb->xcp, g_irqtos);
/* Restore the exception context of the rtcb at the (new) head
* of the g_readytorun task list.
@ -131,9 +131,11 @@ void up_unblock_task(FAR _TCB *tcb)
rtcb = (FAR _TCB*)g_readytorun.head;
dbg("New Active Task TCB=%p\n", rtcb);
/* Then switch contexts */
/* Then setup so that the context will be performed on exit
* from the interrupt.
*/
up_restorestack(&rtcb->xcp);
g_irqcontext = &rtcb->xcp;
}
/* We are not in an interrupt andler. Copy the user C context