commit 0400a14d7f47e6f43dfbeb3b74f1dd3fa2d3eb62
parent d90dad8876457c8d86e8eff69fe25aa56cc3f077
Author: Connor Thomson <connor@gnufault.org>
Date:   Sun, 25 Oct 2026 16:42:10 -0700

Add back the yield syscall

Diffstat:
M
include/ta_mod.h
 | 
1
-
M
include/ta_vm.h
 | 
1
+
M
src/ta_mod.c
 | 
17
++++++++---------

3 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/include/ta_mod.h b/include/ta_mod.h
@@ -14,7 +14,6 @@
 
 #define TA_SYS_EXIT  0
 #define TA_SYS_YIELD 1
-#define TA_SYS_CLEAR 2
 
 extern ta_bool ta_mod_running;
 
diff --git a/include/ta_vm.h b/include/ta_vm.h
@@ -6,6 +6,7 @@
 typedef enum {
 	TA_VM_RUNNING,
 	TA_VM_HALTED,
+	TA_VM_YIELDED,
 	TA_VM_FAULT_ILLEGAL,
 	TA_VM_FAULT_MEMORY,
 	TA_VM_FAULT_MISALIGNED,
diff --git a/src/ta_mod.c b/src/ta_mod.c
@@ -22,16 +22,10 @@ static ta_vm_status mod_ecall(ta_vm *machine, void *user) {
 
             return TA_VM_HALTED;
         }
-        case TA_SYS_CLEAR: {
-            if (ta_display->sprite_mode) {
-                ta_display_sprites_clear();
-            } else {
-                ta_fb_clear(ta_display);
-            }
+        case TA_SYS_YIELD: {
+            machine->pc += 4;
 
-            r[TA_VM_REG_A0] = 0;
-
-            return TA_VM_RUNNING;
+            return TA_VM_YIELDED;
         }
         default: {
             return TA_VM_FAULT_ILLEGAL;
@@ -85,6 +79,11 @@ ta_bool ta_mod_update(void) {
     }
 
     status = ta_vm_run(&vm, TA_MOD_STEPS_PER_FRAME);
+
+    if (status == TA_VM_YIELDED) {
+        status = TA_VM_RUNNING;
+    }
+
     ta_mod_running = loaded && (status == TA_VM_RUNNING);
 
     return ta_mod_running;