From bd113e42fc7a276ceb6962a83c88159a7775e46e Mon Sep 17 00:00:00 2001
From: iliya <iliya.saroukha@hes-so.ch>
Date: Sat, 6 Jan 2024 16:31:49 +0100
Subject: [PATCH] feat: using stack with offset through value stored and loaded
from R1
---
assembleur.s | 7 +++----
mpu_user_console_etu.c | 2 +-
2 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/assembleur.s b/assembleur.s
index ac36678..24a7831 100644
--- a/assembleur.s
+++ b/assembleur.s
@@ -22,12 +22,11 @@ switch_to_user_mode:
// R0: user_starting_address
/*************************/
change_ret:
- ldr r1, =user_stack
- //mrs r1, PSP
- //str r0, [r1, #76]
+ mrs r1, PSP
+ ldr r1, [r1]
str r0, [r1, #24]
msr PSP, r1
- bx lr
+ bx lr
.equ bad_addr,0x90000
diff --git a/mpu_user_console_etu.c b/mpu_user_console_etu.c
index b946221..1439a82 100644
--- a/mpu_user_console_etu.c
+++ b/mpu_user_console_etu.c
@@ -120,7 +120,7 @@ int main(void) {
switch_to_user_mode(); // to be implemented
// testing memory accesses in user mode:
- //test_user_mode(); // to be removed after checking
+ test_user_mode(); // to be removed after checking
while (1) {
exec_user_read_write();
--
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