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Add stack repainting call to ESP class (#5221)

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Allow the unused stack to be reset to the check value at any time in
the application, allowing for delta-stack calculations to be done.

Add ESP.resetFreeContStack() class method for general use.

Add in some dumping in the BearSSL_Validation example to show the
usage for those that care.
This commit is contained in:
Earle F. Philhower, III
2018-10-11 08:55:30 -07:00
committed by GitHub
parent d17ffc2874
commit 1b1b0a28a8
5 changed files with 31 additions and 1 deletions
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15
cores/esp8266/cont_util.c
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@@ -64,3 +64,18 @@ bool ICACHE_RAM_ATTR cont_can_yield(cont_t* cont) {
return !ETS_INTR_WITHINISR() &&
cont->pc_ret != 0 && cont->pc_yield == 0;
}
// No need for this to be in IRAM, not expected to be IRQ called
void cont_repaint_stack(cont_t *cont)
{
register uint32_t *sp asm("a1");
// Ensure 64 bytes adjacent to the current SP don't get touched to endure
// we don't accidentally trounce over locals or IRQ temps.
uint32_t sp_safe = CONT_STACKSIZE/4 - ((sp - &cont->stack[0] - 64)/4);
// Fill stack with magic values
for(uint32_t pos = 0; pos < sp_safe; pos++)
{
cont->stack[pos] = CONT_STACKGUARD;
}
}