From: Keith Packard <keithp@keithp.com>
Date: Sat, 8 Aug 2020 03:08:34 +0000 (-0700)
Subject: altos/stm: Fix stack validation code
X-Git-Tag: 1.9.5~1^2~55
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=304dbcbff72c6fa66c71224ecf98ec55447ffff7

altos/stm: Fix stack validation code

This is not included by default, and broke at some point.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h
index 8f4f6cd4..083f7a2b 100644
--- a/src/stm/ao_arch_funcs.h
+++ b/src/stm/ao_arch_funcs.h
@@ -562,8 +562,8 @@ ao_validate_cur_stack(void)
 
 	asm("mrs %0,psp" : "=&r" (psp));
 	if (ao_cur_task &&
-	    psp <= ao_cur_task->stack &&
-	    psp >= ao_cur_task->stack - 256)
+	    (psp <= ao_cur_task->stack8 ||
+	     psp >= ao_cur_task->stack8 + AO_STACK_SIZE))
 		ao_panic(AO_PANIC_STACK);
 }
 #endif