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-rw-r--r--include/macros.inc29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/macros.inc b/include/macros.inc
index 9eac27a..7d2f10f 100644
--- a/include/macros.inc
+++ b/include/macros.inc
@@ -15,3 +15,32 @@
cps #0x13 // Setup sp in SVC mode.
ldr sp, =svc_stack_core\coreid
.endm
+
+.macro preserve_ctx
+ cps #0x1f // Sys mode
+ // Store Usr regs
+ push {r0-r12}
+ push {lr}
+ ldr r3, =scheduler // struct Scheduler
+ ldr r2, [r3, #0] // struct Thread* rthread
+ str sp, [r2, #4] // svc_lr -> void* sp
+ cps #0x13 // Svc mode
+ mrs r1, spsr
+ str r1, [r2, #0xc] // preserve cpsr
+ str lr, [r2, #0] // svc_lr -> void* pc
+.endm
+
+.macro restore_ctx
+ ldr r3, =scheduler // struct Scheduler
+ ldr r2, [r3, #0] // struct Thread* rthread
+ ldr lr, [r2, #0] // void* pc -> lr_svc
+ ldr r0, [r2, #4] // void* sp -> r0
+ ldr r1, [r2, #0xc] // restore cpsr
+ msr spsr_f, r1
+ cps #0x1f // Sys mode
+ mov sp, r0 // Set stack pointer
+ // Restore Usr regs
+ pop {lr}
+ pop {r0-r12}
+ cps #0x13 // Svc mode
+.endm