lm32: Make setjmp return '1' when longjmp is passed '0'

When the application calls longjmp with '0', the library is supposed
to replace that with '1' when returning from setjmp.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

newlib/libc/machine/lm32/setjmp.S

@@ -25,14 +25,11 @@
 /* setjmp/longjmp for LatticeMico32. */
 #include <picolibc.h>
 
- 
 	.section	.text
 	.align	4
 
 	.globl	setjmp
 	.type	setjmp,@function
-	.globl	longjmp
-	.type	longjmp,@function
 
 /* setjmp: save all callee saves into jmp_buf
    r1 - Address of jmp_buf
@@ -60,6 +57,7 @@ setjmp:
         sw      (r1+72), ra
         mvi     r1, 0
         ret
+	.size setjmp, . - setjmp
 
 /* longjmp: restore all callee saves from jmp_buf
    r1 - Address of jmb_buf
@@ -91,6 +89,8 @@ longjmp:
         lw      sp, (r1+68)
         lw      ra, (r1+72)
         mv      r1, r2
+	# Return 1 if the argument is zero
+	cmpe	r1, r0, r2
+	add	r1, r1, r2
         ret
-
-
+	.size longjmp, . - longjmp