Import newlib and create makefile

1 files changed, 31 insertions, 0 deletions

diff --git a/newlib/libc/sys/sysvi386/_longjmp.s b/newlib/libc/sys/sysvi386/_longjmp.s
new file mode 100644
index 0000000..691409b
--- /dev/null
+++ b/newlib/libc/sys/sysvi386/_longjmp.s
@@ -0,0 +1,31 @@
+/
+/ our buffer looks like:
+/  eax,ebx,ecx,edx,esi,edi,esp,ebp,pc
+/
+/ _longjmp is called with two parameters:  jmp_buf*,int
+/ jmp_buf* is at 4(%esp), int is at 8(%esp)
+/ retaddr is, of course, at (%esp)
+
+	.globl	_longjmp
+	.globl	longjmp
+_longjmp:
+longjmp:
+	movl	4(%esp), %ebx	/ address of buf
+	movl	8(%esp), %eax	/ store return value
+
+	movl	24(%ebx), %esp	/ restore stack
+	movl	32(%ebx), %edi
+/ Next line sets up return address.
+	movl	%edi, 0(%esp)	
+	movl	8(%ebx), %ecx
+	movl	12(%ebx), %edx
+	movl	16(%ebx), %esi
+	movl	20(%ebx), %edi
+	movl	28(%ebx), %ebp
+	movl	4(%ebx), %ebx
+	testl	%eax,%eax
+	jne	bye
+	incl	%eax		/ eax hold 0 if we are here
+bye:
+	ret
+