added website data, because it had heaps of good tutorials and info

1 files changed, 123 insertions, 0 deletions

diff --git a/riemann.fmi.uni-sofia.bg/ngetty/ngetty-1.1/system-i386.S b/riemann.fmi.uni-sofia.bg/ngetty/ngetty-1.1/system-i386.S
new file mode 100644
index 0000000..9e92cd4
--- /dev/null
+++ b/riemann.fmi.uni-sofia.bg/ngetty/ngetty-1.1/system-i386.S
@@ -0,0 +1,123 @@
+.comm system__errno,4,4
+.comm environ,4,4
+
+.text
+.global _start
+_start:
+	popl	%ecx			/* %ecx = argc */
+	movl	%esp,%esi		/* %esi = argv */
+	pushl	%ecx
+	leal	4(%esi,%ecx,4),%eax	/* %eax = envp = (4*ecx)+%esi+4 */
+
+	pushl	%eax
+	pushl	%esi
+	pushl	%ecx
+	movl	%eax,environ
+
+	call	main
+	pushl	%eax
+	call	exit
+	hlt	/* die now ! will ya ... */
+.size	 _start,.-_start
+
+/* ------------------------------------------------------- */
+.text
+.weak exit
+exit:
+.global _exit
+.type	_exit,@function
+_exit:
+	movb	$1,%al
+.size _exit,.-_exit
+
+.global __unified_syscall
+.type	__unified_syscall,@function
+__unified_syscall:
+	movzbl	%al, %eax
+.size __unified_syscall,.-__unified_syscall
+
+.global __unified_return
+.type	__unified_return,@function
+__unified_return:
+	push	%edi
+	push	%esi
+	push	%ebx
+	movl	%esp,%edi
+	/* we use movl instead of pop because otherwise a signal would
+	   destroy the stack frame and crash the program, although it
+	   would save a few bytes. */
+	movl	0x10(%edi),%ebx
+	movl	0x14(%edi),%ecx
+	movl	0x18(%edi),%edx
+	movl	0x1c(%edi),%esi
+	movl	0x20(%edi),%edi
+	int	$0x80
+
+	cmp	$-124,%eax
+	jb	.Lnoerror
+	neg	%eax
+	mov	%eax,system__errno
+	sbb	%eax,%eax               # eax = eax - eax - CY = -1
+.Lnoerror:
+	pop	%ebx
+	pop	%esi
+	pop	%edi
+	ret
+.size __unified_return,.-__unified_return
+
+/* ------------------------------------------------------- */
+#define do_it(name,sym) \
+.type sym,@function; \
+.global sym; \
+sym: \
+.ifle __NR_##name-255; \
+	movb $__NR_##name,%al; \
+	jmp __unified_syscall; \
+.else; \
+	movw $__NR_##name,%ax; \
+	jmp __unified_syscall_256; \
+.endif; \
+.size sym,.-sym
+
+
+#define syscall(name,sym) \
+.text; \
+do_it(name,sym)
+
+
+#define syscall_weak(name,wsym,sym) \
+.text; \
+.type wsym,@function; \
+.weak wsym; \
+wsym:; \
+do_it(name,sym)
+
+/* ------------------------------------------------------- */
+#include <asm/unistd.h>
+	
+#define S(x)	syscall(x,x)
+#define S__(x)	syscall(x,__##x)
+
+S(nanosleep)
+S(fork)
+S(dup2)
+S(close)
+S(execve)
+S(chown)
+S(chmod)
+S(open)
+S(kill)
+S(waitpid)
+S(poll)
+S__(rt_sigaction)
+		
+/* ------------------------------------------------------- */
+#if 0
+.text
+.global __unified_syscall_256
+.type __unified_syscall_256,@function
+__unified_syscall_256:
+	movzwl %ax,%eax
+	jmp __unified_return
+.size	__unified_syscall_256,.-__unified_syscall_256
+#endif