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Soren Ptak 2023-09-05 17:24:04 -04:00 • committed by GitHub
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46
portable/GCC/ARM_CM0/port.c
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@ -205,20 +205,20 @@ void vPortStartFirstTask( void )
* Not all M0 parts have the application vector table at address 0. */
__asm volatile (
" .syntax unified \n"
" ldr r2, pxCurrentTCBConst2 \n"/* Obtain location of pxCurrentTCB. */
" ldr r2, pxCurrentTCBConst2 \n" /* Obtain location of pxCurrentTCB. */
" ldr r3, [r2] \n"
" ldr r0, [r3] \n"/* The first item in pxCurrentTCB is the task top of stack. */
" adds r0, #32 \n"/* Discard everything up to r0. */
" msr psp, r0 \n"/* This is now the new top of stack to use in the task. */
" movs r0, #2 \n"/* Switch to the psp stack. */
" ldr r0, [r3] \n" /* The first item in pxCurrentTCB is the task top of stack. */
" adds r0, #32 \n" /* Discard everything up to r0. */
" msr psp, r0 \n" /* This is now the new top of stack to use in the task. */
" movs r0, #2 \n" /* Switch to the psp stack. */
" msr CONTROL, r0 \n"
" isb \n"
" pop {r0-r5} \n"/* Pop the registers that are saved automatically. */
" mov lr, r5 \n"/* lr is now in r5. */
" pop {r3} \n"/* Return address is now in r3. */
" pop {r2} \n"/* Pop and discard XPSR. */
" cpsie i \n"/* The first task has its context and interrupts can be enabled. */
" bx r3 \n"/* Finally, jump to the user defined task code. */
" pop {r0-r5} \n" /* Pop the registers that are saved automatically. */
" mov lr, r5 \n" /* lr is now in r5. */
" pop {r3} \n" /* Return address is now in r3. */
" pop {r2} \n" /* Pop and discard XPSR. */
" cpsie i \n" /* The first task has its context and interrupts can be enabled. */
" bx r3 \n" /* Finally, jump to the user defined task code. */
" \n"
" .align 4 \n"
"pxCurrentTCBConst2: .word pxCurrentTCB "
@ -330,13 +330,13 @@ void xPortPendSVHandler( void )
" .syntax unified \n"
" mrs r0, psp \n"
" \n"
" ldr r3, pxCurrentTCBConst \n"/* Get the location of the current TCB. */
" ldr r3, pxCurrentTCBConst \n" /* Get the location of the current TCB. */
" ldr r2, [r3] \n"
" \n"
" subs r0, r0, #32 \n"/* Make space for the remaining low registers. */
" str r0, [r2] \n"/* Save the new top of stack. */
" stmia r0!, {r4-r7} \n"/* Store the low registers that are not saved automatically. */
" mov r4, r8 \n"/* Store the high registers. */
" subs r0, r0, #32 \n" /* Make space for the remaining low registers. */
" str r0, [r2] \n" /* Save the new top of stack. */
" stmia r0!, {r4-r7} \n" /* Store the low registers that are not saved automatically. */
" mov r4, r8 \n" /* Store the high registers. */
" mov r5, r9 \n"
" mov r6, r10 \n"
" mov r7, r11 \n"
@ -346,21 +346,21 @@ void xPortPendSVHandler( void )
" cpsid i \n"
" bl vTaskSwitchContext \n"
" cpsie i \n"
" pop {r2, r3} \n"/* lr goes in r3. r2 now holds tcb pointer. */
" pop {r2, r3} \n" /* lr goes in r3. r2 now holds tcb pointer. */
" \n"
" ldr r1, [r2] \n"
" ldr r0, [r1] \n"/* The first item in pxCurrentTCB is the task top of stack. */
" adds r0, r0, #16 \n"/* Move to the high registers. */
" ldmia r0!, {r4-r7} \n"/* Pop the high registers. */
" ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
" adds r0, r0, #16 \n" /* Move to the high registers. */
" ldmia r0!, {r4-r7} \n" /* Pop the high registers. */
" mov r8, r4 \n"
" mov r9, r5 \n"
" mov r10, r6 \n"
" mov r11, r7 \n"
" \n"
" msr psp, r0 \n"/* Remember the new top of stack for the task. */
" msr psp, r0 \n" /* Remember the new top of stack for the task. */
" \n"
" subs r0, r0, #32 \n"/* Go back for the low registers that are not automatically restored. */
" ldmia r0!, {r4-r7} \n"/* Pop low registers. */
" subs r0, r0, #32 \n" /* Go back for the low registers that are not automatically restored. */
" ldmia r0!, {r4-r7} \n" /* Pop low registers. */
" \n"
" bx r3 \n"
" \n"