Merge pull request #7368 from dhalbert/preserve-nlr_push-regs

Use returns_twice attribute to preserve regs in nlrthumb nlr_push()
adafruit · Dec 21, 2022 · 2f14768 · 2f14768
2 parents 2a1bb72 + 8087887
commit 2f14768
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/py/nlrthumb.c b/py/nlrthumb.c
@@ -36,7 +36,7 @@
 // For reference, arm/thumb callee save regs are:
 //      r4-r11, r13=sp
 
-__attribute__((naked)) unsigned int nlr_push(nlr_buf_t *nlr) {
+__attribute__((naked, returns_twice)) unsigned int nlr_push(nlr_buf_t *nlr) {
 
     __asm volatile (
         "str    r4, [r0, #12]       \n" // store r4 into nlr_buf