From 36f2d87ee57e841be5fe60f6430bdd167f9f03af Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Tue, 1 Feb 2022 17:19:16 -0700
Subject: Added spinlock condition
---
src/exceptions/svc.S | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
(limited to 'src')
diff --git a/src/exceptions/svc.S b/src/exceptions/svc.S
index a5e9982..d1fcbc0 100644
--- a/src/exceptions/svc.S
+++ b/src/exceptions/svc.S
@@ -5,9 +5,6 @@ svc:
stmfd sp!, {r0-r12,lr}
ldr r0, [lr, #-4]
bic r0, #0xFF000000
- // SVC #0 returns to supervisor mode
- // TODO: Make supervisor mode return to a specific location
- // (rather than to a user location) such as the kernel loop
cmp r0, #3
bgt svc_exit
beq svc_000003
@@ -27,7 +24,7 @@ svc_000002:
b schedule
svc_000003:
ldr r3, =scheduler
- ldr r2, [r3, #0]
+ ldr r2, [r3, #0] // struct Thread* rthread
ldr r1, [r2, #8] // sp_base
cmp r1, #-1
beq svc_exit
--
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