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freertos: riscv: fix vPortTaskWrapper for clang

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This commit is contained in:
Alexey Lapshin 2023-02-02 01:17:28 +07:00
parent 851c10aded
commit d1214aef8c
4 changed files with 8 additions and 44 deletions
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16
components/freertos/FreeRTOS-Kernel-SMP/portable/riscv/port.c
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@ -469,23 +469,15 @@ FORCE_INLINE_ATTR UBaseType_t uxInitialiseStackTLS(UBaseType_t uxStackPointer, u
}
#if CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER
/**
* Wrapper to allow task functions to return. Force the optimization option -O1 on that function to make sure there
* is no tail-call. Indeed, we need the compiler to keep the return address to this function when calling `panic_abort`.
*
* Thanks to `naked` attribute, the compiler won't generate a prologue and epilogue for the function, which saves time
* and stack space.
*/
static void __attribute__((optimize("O1"), naked)) vPortTaskWrapper(TaskFunction_t pxCode, void *pvParameters)
static void vPortTaskWrapper(TaskFunction_t pxCode, void *pvParameters)
{
asm volatile(".cfi_undefined ra\n");
__asm__ volatile(".cfi_undefined ra"); // tell to debugger that it's outermost (inital) frame
extern void __attribute__((noreturn)) panic_abort(const char *details);
static char DRAM_ATTR msg[80] = "FreeRTOS: FreeRTOS Task \"\0";
pxCode(pvParameters);
//FreeRTOS tasks should not return. Log the task name and abort.
char *pcTaskName = pcTaskGetName(NULL);
/* FreeRTOS tasks should not return. Log the task name and abort. */
/* We cannot use s(n)printf because it is in flash */
strcat(msg, pcTaskName);
strcat(msg, pcTaskGetName(NULL));
strcat(msg, "\" should not return, Aborting now!");
panic_abort(msg);
}

28
components/freertos/FreeRTOS-Kernel/portable/riscv/port.c
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@ -194,37 +194,17 @@ FORCE_INLINE_ATTR UBaseType_t uxInitialiseStackTLS(UBaseType_t uxStackPointer, u
}
#if CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER
/**
* Wrapper to allow task functions to return. Force the optimization option -O1 on that function to make sure there
* is no tail-call. Indeed, we need the compiler to keep the return address to this function when calling `panic_abort`.
*
* Thanks to `naked` attribute, the compiler won't generate a prologue and epilogue for the function, which saves time
* and stack space.
*/
static void __attribute__((optimize("O1"), naked)) vPortTaskWrapper(TaskFunction_t pxCode, void *pvParameters)
static void vPortTaskWrapper(TaskFunction_t pxCode, void *pvParameters)
{
#ifdef __clang__
// clang generates error "error: non-ASM statement in naked function is not supported"
// The reason for it is described at
// https://stackoverflow.com/questions/47316611/clang-error-non-asm-statement-in-naked-function-is-not-supported.
// GCC docs say that there is no guarantee that non-ASM statement in naked function will work:
// "Only basic asm statements can safely be included in naked functions (see Basic Asm).
// While using extended asm or a mixture of basic asm and C code may appear to work, they cannot be
// depended upon to work reliably and are not supported."
// TODO: IDF-6347
#error CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER not supported yet when building with Clang!
#else
asm volatile(".cfi_undefined ra\n");
__asm__ volatile(".cfi_undefined ra"); // tell to debugger that it's outermost (inital) frame
extern void __attribute__((noreturn)) panic_abort(const char *details);
static char DRAM_ATTR msg[80] = "FreeRTOS: FreeRTOS Task \"\0";
pxCode(pvParameters);
//FreeRTOS tasks should not return. Log the task name and abort.
char *pcTaskName = pcTaskGetName(NULL);
/* FreeRTOS tasks should not return. Log the task name and abort. */
/* We cannot use s(n)printf because it is in flash */
strcat(msg, pcTaskName);
strcat(msg, pcTaskGetName(NULL));
strcat(msg, "\" should not return, Aborting now!");
panic_abort(msg);
#endif
}
#endif // CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER

4
components/freertos/linker.lf
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@ -232,8 +232,6 @@ entries:
if IDF_TARGET_ARCH_XTENSA = y:
port:xPortStartScheduler (default)
port:vPortEndScheduler (default)
if FREERTOS_TASK_FUNCTION_WRAPPER = y:
port:vPortTaskWrapper (default)
port:pxPortInitialiseStack (default)
if IDF_TARGET_ESP32 = y || IDF_TARGET_ESP32S3 = y :
port:vPortCleanUpCoprocArea (default)
@ -245,7 +243,5 @@ entries:
if IDF_TARGET_ARCH_RISCV = y:
port:xPortStartScheduler (default)
port:vPortEndScheduler (default)
if FREERTOS_TASK_FUNCTION_WRAPPER = y:
port:vPortTaskWrapper (default)
port:pxPortInitialiseStack (default)
port:xPortGetTickRateHz (default)

4
components/freertos/linker_smp.lf
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@ -215,8 +215,6 @@ entries:
port:vPortFree (default)
port:vPortInitialiseBlocks (default)
port:xPortGetFreeHeapSize (default)
if FREERTOS_TASK_FUNCTION_WRAPPER = y:
port:vPortTaskWrapper (default)
port:pxPortInitialiseStack (default)
if FREERTOS_UNICORE = n:
port:vPortCleanUpCoprocArea (default)
@ -235,8 +233,6 @@ entries:
port:vPortFree (default)
port:vPortInitialiseBlocks (default)
port:xPortGetFreeHeapSize (default)
if FREERTOS_TASK_FUNCTION_WRAPPER = y:
port:vPortTaskWrapper (default)
port:pxPortInitialiseStack (default)
if FREERTOS_TLSP_DELETION_CALLBACKS = y:
port:vPortTLSPointersDelCb (default)