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Fix XCore DP/CP register corruption bug (#352)

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The kernel code that runs within RTOS ISRs requires that DP and CP not
be changed from their initial values. If a task changes them and is
interrupted while they are changed, then they must be restored for the
ISR. This commit implements this.

This relies on a corresponding change to the xcore lib_rtos_support.
This commit is contained in:
Michael Bruno 2021-06-28 11:44:24 -04:00 committed by GitHub
parent a9754a8fdd
commit a7092d400c
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 16 additions and 10 deletions
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13
portable/ThirdParty/xClang/XCORE200/portasm.S vendored
View file

@ -59,10 +59,13 @@ rtos_interrupt_callback_common:
/* The stack was extended for this by the wrapper function. */
/* Begin only by saving some registers. The rest will be saved */
/* later if vTaskSwitchContext() needs to be called. */
/* DP and CP need to be saved because these are restored for the kernel ISR. */
/* LR needs to be saved because it is clobbered when calling the callback. */
/* r0-r3, and r11 need to be saved because the callback may clobber them. */
/* r4 is saved because it is used here to hold the task SP. */
stw dp, sp[5]
stw cp, sp[6]
stw lr, sp[7]
stw r0, sp[8]
/*stw r1, sp[9] already saved by the wrapper function. */
@ -78,7 +81,9 @@ rtos_interrupt_callback_common:
/* that it saves to KSP[0]. We already have it in r4. */
get r11, ed} /* Get the event data... */
{mov r0, r11 /* into the first argument for the callback function... */
ldw dp, sp[3] /* (Restore CP and DP required for the RTOS ISR */
ldw cp, sp[4] /* in case the active thread has modified them.) */
{mov r0, r11 /* ...into the first argument for the callback function, */
bla r1} /* and call the callback function. */
{set sp, r4 /* Restore the task's SP now. */
@ -98,8 +103,6 @@ _yield_continue:
stw ssr, sp[2]
stw sed, sp[3]
stw et, sp[4]
stw dp, sp[5]
stw cp, sp[6]
stw r5, sp[13]
stw r6, sp[14]
stw r7, sp[15]
@ -134,8 +137,6 @@ _freertos_restore_ctx:
ldw ssr, sp[2]
ldw sed, sp[3]
ldw et, sp[4]
ldw dp, sp[5]
ldw cp, sp[6]
ldw r5, sp[13]
ldw r6, sp[14]
ldw r7, sp[15]
@ -143,6 +144,8 @@ _freertos_restore_ctx:
ldw r9, sp[17]
ldw r10, sp[18]
_freertos_restore_ctx_partial:
ldw dp, sp[5]
ldw cp, sp[6]
ldw lr, sp[7]
ldw r0, sp[8]
ldw r1, sp[9]

13
portable/ThirdParty/xClang/XCOREAI/portasm.S vendored
View file

@ -59,10 +59,13 @@ rtos_interrupt_callback_common:
/* The stack was extended for this by the wrapper function. */
/* Begin only by saving some registers. The rest will be saved */
/* later if vTaskSwitchContext() needs to be called. */
/* DP and CP need to be saved because these are restored for the kernel ISR. */
/* LR needs to be saved because it is clobbered when calling the callback. */
/* r0-r3, and r11 need to be saved because the callback may clobber them. */
/* r4 is saved because it is used here to hold the task SP. */
stw dp, sp[5]
stw cp, sp[6]
stw lr, sp[7]
stw r0, sp[8]
/*stw r1, sp[9] already saved by the wrapper function. */
@ -78,7 +81,9 @@ rtos_interrupt_callback_common:
/* that it saves to KSP[0]. We already have it in r4. */
get r11, ed} /* Get the event data... */
{mov r0, r11 /* into the first argument for the callback function... */
ldw dp, sp[3] /* (Restore CP and DP required for the RTOS ISR */
ldw cp, sp[4] /* in case the active thread has modified them.) */
{mov r0, r11 /* ...into the first argument for the callback function, */
bla r1} /* and call the callback function. */
{set sp, r4 /* Restore the task's SP now. */
@ -100,8 +105,6 @@ _yield_continue:
stw ssr, sp[2]
stw sed, sp[3]
stw et, sp[4]
stw dp, sp[5]
stw cp, sp[6]
stw r5, sp[13]
stw r6, sp[14]
stw r7, sp[15]
@ -160,8 +163,6 @@ _freertos_restore_ctx:
ldw ssr, sp[2]
ldw sed, sp[3]
ldw et, sp[4]
ldw dp, sp[5]
ldw cp, sp[6]
ldw r5, sp[13]
ldw r6, sp[14]
ldw r7, sp[15]
@ -169,6 +170,8 @@ _freertos_restore_ctx:
ldw r9, sp[17]
ldw r10, sp[18]
_freertos_restore_ctx_partial:
ldw dp, sp[5]
ldw cp, sp[6]
ldw lr, sp[7]
ldw r0, sp[8]
ldw r1, sp[9]