20000317 sourceware import

libgloss/m32r/trap0.S

@@ -0,0 +1,16 @@
+; Trap 0 handler (syscall interface).
+;
+; The trap handler returns the result in r0 and the error code (errno value)
+; in r2.  r1 is reserved in case an 8 byte quantity ever needs to be
+; returned in registers.
+
+	.text
+	.global	__trap0
+__trap0:
+	trap	#0		; trap 0 returns result in r0, error code in r2
+	cmpui	r2,#1		; is error code zero?
+	bc	.Lret		; yes, skip setting errno
+	ld	r4,@(sp)	; no, set errno
+	st	r2,@r4
+.Lret:
+	jmp	lr		; return to caller