��-��

�� . �� , � �� , �� , �� . �� .
�� id/st �� SPARC, �� 2.2, �� -�� 13-�� .
�� . ��, �� , � � �� , �� . � �� .
3 �� , � �� , � �� . �� -- �� , � �� -�� .
� �� (� �� ) �� .

��

�� (�, C++, Pascal) � �� , �� .
�� , �� . � SPARC �� (��. 2.9), �� , �� .

��. 2.9. �� SPARC

�� (�� ) �� , ��, �� . �� (��, � PDP-11) �� , � � �� , � ��680�� VAX, � �� 86, �� (��. 2.10, �� 2.4).

�� 2.4. ��, �� . �� GNU � 2.7.2.1 (�� )

#include <stdio.h>
# include <strings.h>

/* �� SMTP (RFC822) */
int parse_line(FILE * socket)
{
/* �� RFC822, �� 4 ��,� �� 255 �� V char cmd[5], args [255]; fscanf (socket, "%s %s\n", cmd, args);
if (stricmpfcmd, "HELO")==0) {
fprintf (socket, "200 Hello, %s, glad to meet you\n", args);
return 200;
)
/* etc */
fprintf (socket, "500 Unknown command %s\n", cmd);
return 500;
.file "sample" gcc2_compiled. : _ gnu_compiled_c : .text LCO:
.ascii "%s %s\12\0" LCI:
.ascii "HELCAO" LC2:
.ascii "200 Hello, %s, glad to meet you\12\0" LC3:
.ascii "500 Unknown command %s\12\0"
.align 2, 0x90 .globl _parse_line _parse_line:
; x86 �� enter, �� ; �� 255 ��. � �� ; �� , � �� .
pushl %ebp ; ��
; �� .
movl %esp, %ebp ; ��
subl $264,%esp ; � �� . ; ��
leal -264 (%ebp) , %�� ; �� args � pushl %eax
leal -8 (%ebp) , %�� ; ... �� cmd
pushl %eax
pushl $LCO ; ��
; �� . movl 8(%ebp),%eax ; �� socket �� pushl %eax ; � ��
call fscanf ; �� (�� ) addl $16,%esp ; ��
; � �� , ��
; �� . �� ,
; �� .
pushl $LC1
leal -8(%ebp),%eax
pushl %eax
call _stricmp
addl $8,%esp
movl %eax,%eax ; �� :)
; � �� , �� ; ��.
testl %eax,%��
jne L14
leal -264(%ebp),%��
pushl %eax
pushl $LC2
movl 8(%ebp),%eax
pushl %eax
call _fprintf
addl $12,%esp
; �� , �� ; �� return.
movl $200,%eax
jmp L13
� �� : � �� . �� NOP ; (�� 0x90).
align 2,0x90 L14:
leal -8(%ebp),%��
Pushl %eax
Pushl $LC3
movl 8(%ebp),%eax pushl %eax
call _fprintf
addl ?12,%esp
movl $500,%eax
jmp L13
.align 2,0x90 L13:
; �� leave �� , �� : ; �� : move %ebp, %esp; pop %ebp. ; �� , �� ; �� .
leave
ret

��. 2.10. ��

��
�� , �� 2.4 �� . � �� , �� 4 ��, � �� 255. �� -�� (�� ) �� RFC822 [RFC822], �� . �� , �� : �� /�� . ��, � �� , �� 12.

�� .

�� SPARC
�� SPARC �� . ��-��, �� 32-�� . �� 2.4. ��-��, �� , �� , �� 6 ��-�� . �-��, �� . �-��, � �� . �� [www.sparc.com v9].
�� Isp (�6) � %fp (i6). �� save %sp, -96 %sp �� : �� , �� . �� , �� %sp �� %fp, � �� %sp.
�� . �� SPARC �� , �� CANSAVE � CANRESTORE. ��, �� , �� (��. 2.11). �� , � �� (CANRESTORE=1) � �� (CANSAVE=3). �� OTHERWIN �� , �� . �� w4 �� (�� ) �� . �� , �� , �� , � �� , �� CANSAVE + CANRESTORE + OTHERWIN = NWINDOWS - 2, �� NWINDOWS- �� (�� 8 ��, �. �. 128 ��).

��. 2.11. �� SPARC � �� . �� CANSAVE � CANRESTORE (��. �� [www.sparc.com v9])

�� (� ��, �� 2.11 �� w7), �� (window fill) � �� (window spill). �� , �� OTHERWIN, �� .
� �� , �� , � �� %sp �� . �� , �� .