/*\r
- FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.\r
+ FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd.\r
+ All rights reserved\r
\r
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
\r
the terms of the GNU General Public License (version 2) as published by the\r
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
\r
- >>! NOTE: The modification to the GPL is included to allow you to distribute\r
- >>! a combined work that includes FreeRTOS without being obliged to provide\r
- >>! the source code for proprietary components outside of the FreeRTOS\r
- >>! kernel.\r
+ >>! NOTE: The modification to the GPL is included to allow you to !<<\r
+ >>! distribute a combined work that includes FreeRTOS without being !<<\r
+ >>! obliged to provide the source code for proprietary components !<<\r
+ >>! outside of the FreeRTOS kernel. !<<\r
\r
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
#define portEPC_STACK_LOCATION 124\r
#define portSTATUS_STACK_LOCATION 128\r
\r
-/******************************************************************/ \r
+/******************************************************************/\r
.macro portSAVE_CONTEXT\r
\r
- /* Make room for the context. First save the current status so we can \r
- manipulate it, and the cause and EPC registers so we capture their \r
- original values in case of interrupt nesting. */\r
+ /* Make room for the context. First save the current status so it can be\r
+ manipulated, and the cause and EPC registers so their original values are\r
+ captured. */\r
mfc0 k0, _CP0_CAUSE\r
addiu sp, sp, -portCONTEXT_SIZE\r
mfc0 k1, _CP0_STATUS\r
\r
- /* Also save s6 and s5 so we can use them during this interrupt. Any\r
- nesting interrupts should maintain the values of these registers\r
- across the ISR. */\r
+ /* Also save s6 and s5 so they can be used. Any nesting interrupts should\r
+ maintain the values of these registers across the ISR. */\r
sw s6, 44(sp)\r
sw s5, 40(sp)\r
sw k1, portSTATUS_STACK_LOCATION(sp)\r
\r
- /* Enable interrupts above the current priority. */\r
+ /* Prepare to enable interrupts above the current priority. */\r
srl k0, k0, 0xa\r
ins k1, k0, 10, 6\r
ins k1, zero, 1, 4\r
\r
/* If the nesting count is 0 then swap to the the system stack, otherwise\r
the system stack is already being used. */\r
- bne s6, zero, .+20\r
+ bne s6, zero, 1f\r
nop\r
\r
/* Swap to the system stack. */\r
lw sp, (sp)\r
\r
/* Increment and save the nesting count. */\r
- addiu s6, s6, 1\r
+1: addiu s6, s6, 1\r
sw s6, 0(k0)\r
\r
/* s6 holds the EPC value, this is saved after interrupts are re-enabled. */\r
/* Save the context into the space just created. s6 is saved again\r
here as it now contains the EPC value. No other s registers need be\r
saved. */\r
- sw ra, 120(s5)\r
+ sw ra, 120(s5)\r
sw s8, 116(s5)\r
sw t9, 112(s5)\r
- sw t8, 108(s5)\r
- sw t7, 104(s5)\r
+ sw t8, 108(s5)\r
+ sw t7, 104(s5)\r
sw t6, 100(s5)\r
sw t5, 96(s5)\r
sw t4, 92(s5)\r
la s6, uxInterruptNesting\r
lw s6, (s6)\r
addiu s6, s6, -1\r
- bne s6, zero, .+20\r
+ bne s6, zero, 1f\r
nop\r
\r
/* Save the stack pointer. */\r
la s6, uxSavedTaskStackPointer\r
sw s5, (s6)\r
-\r
+1:\r
.endm\r
- \r
-/******************************************************************/ \r
+\r
+/******************************************************************/\r
.macro portRESTORE_CONTEXT\r
\r
/* Restore the stack pointer from the TCB. This is only done if the\r
la s6, uxInterruptNesting\r
lw s6, (s6)\r
addiu s6, s6, -1\r
- bne s6, zero, .+20\r
+ bne s6, zero, 1f\r
nop\r
la s6, uxSavedTaskStackPointer\r
lw s5, (s6)\r
- \r
+\r
/* Restore the context. */\r
- lw s6, 8(s5)\r
+1: lw s6, 8(s5)\r
mtlo s6\r
lw s6, 12(s5)\r
mthi s6\r
\r
/* Protect access to the k registers, and others. */\r
di\r
+ ehb\r
\r
/* Decrement the nesting count. */\r
la k0, uxInterruptNesting\r
lw k0, portSTATUS_STACK_LOCATION(s5)\r
lw k1, portEPC_STACK_LOCATION(s5)\r
\r
- /* Leave the stack how we found it. First load sp from s5, then restore\r
- s5 from the stack. */\r
+ /* Leave the stack in its original state. First load sp from s5, then\r
+ restore s5 from the stack. */\r
add sp, zero, s5\r
lw s5, 40(sp)\r
- addiu sp, sp, portCONTEXT_SIZE\r
+ addiu sp, sp, portCONTEXT_SIZE\r
\r
mtc0 k0, _CP0_STATUS\r
mtc0 k1, _CP0_EPC\r
- eret \r
+ ehb\r
+ eret\r
nop\r
\r
.endm\r
projects / freertos / blobdiff