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23SCR/SCR016-ARM/SCR016.txt

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+1 et 2. systeme d'exploitation : Linux en 64 bits / architect : aarch64 / process: Little Endian
+
+2.
+
+as -gstabs -o printHW.o printHW.s
+ld -O0 printHW.o
+
+3.
+
+./a.out => "Hello World!"
+
+4]
+raban@rp73:~/SCR/TP16-ARM$ gdb a.out
+GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
+Copyright (C) 2021 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+Type "show copying" and "show warranty" for details.
+This GDB was configured as "aarch64-linux-gnu".
+Type "show configuration" for configuration details.
+For bug reporting instructions, please see:
+<https://www.gnu.org/software/gdb/bugs/>.
+Find the GDB manual and other documentation resources online at:
+    <http://www.gnu.org/software/gdb/documentation/>.
+
+For help, type "help".
+Type "apropos word" to search for commands related to "word"...
+Reading symbols from a.out...
+(gdb) run
+Starting program: /export/home/senart22/raban/SCR/TP16-ARM/a.out 
+Hello World!
+[Inferior 1 (process 634476) exited normally]
+(gdb) l 10,15
+10	.text // tells assembler to assemble the following
+11	// in the text (code) section
+12	.globl _start // _start is there where the program starts,
+13	// .globl makes it visible to the linker
+14	_start:
+15	mov x0,#1 // value 1 is placed in register x0
+(gdb) b 12
+Breakpoint 1 at 0x4000b0: file printHW.s, line 15.
+(gdb) run
+Starting program: /export/home/senart22/raban/SCR/TP16-ARM/a.out 
+
+Breakpoint 1, _start () at printHW.s:15
+15	mov x0,#1 // value 1 is placed in register x0
+(gdb) i r x0 x1 x2 w8
+x0             0x0                 0
+x1             0x0                 0
+x2             0x0                 0
+w8             0x0                 0
+(gdb) step
+16	adr x1,msg // the address retained by label msg is placed in register x1
+(gdb) i r x0 x1 x2 w8
+x0             0x1                 1
+x1             0x0                 0
+x2             0x0                 0
+w8             0x0                 0
+(gdb) s
+17	mov x2,#13
+(gdb) i r x0 x1 x2 w8
+x0             0x1                 1
+x1             0x4100d0            4260048
+x2             0x0                 0
+w8             0x0                 0
+(gdb) x /s 0x4100d0
+0x4100d0:	"Hello World!\n"
+(gdb) x /14cb 0x4100d0
+0x4100d0:	72 'H'	101 'e'	108 'l'	108 'l'	111 'o'	32 ' '	87 'W'	111 'o'
+0x4100d8:	114 'r'	108 'l'	100 'd'	33 '!'	10 '\n'	0 '\000'
+(gdb) s
+18	mov w8, #SYS_WRITE // svc must find the syscall number in w8
+(gdb) i r x0 x1 x2 w8
+x0             0x1                 1
+x1             0x4100d0            4260048
+x2             0xd                 13
+w8             0x0                 0
+(gdb) s
+20	svc #0 // invoke syscall: displays on the screen
+(gdb) i r x0 x1 x2 w8
+x0             0x1                 1
+x1             0x4100d0            4260048
+x2             0xd                 13
+w8             0x40                64
+(gdb) s
+Hello World!
+21	mov x0, #0 // in x0 put the value you want to exit with
+(gdb) c
+Continuing.
+[Inferior 1 (process 634489) exited normally]
+(gdb) 
+

23SCR/SCR016-ARM/printHW.s

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+/*
+Lines enclosed here are comments
+A small program: prints "Hello World!"
+*/
+// From // to the end of this line is a comment: next are directives to the assembler
+.equ SYS_EXIT, 93
+.equ SYS_WRITE, 64
+.data // tells assembler to assemble the following in the data section
+msg: .asciz "Hello World!\n" //msg retains the address of the string
+.text // tells assembler to assemble the following
+// in the text (code) section
+.globl _start // _start is there where the program starts,
+// .globl makes it visible to the linker
+_start:
+mov x0,#1 // value 1 is placed in register x0
+adr x1,msg // the address retained by label msg is placed in register x1
+mov x2,#13
+mov w8, #SYS_WRITE // svc must find the syscall number in w8
+// and the syscall arguments in x0,x1,x2
+svc #0 // invoke syscall: displays on the screen
+mov x0, #0 // in x0 put the value you want to exit with
+mov w8,#SYS_EXIT
+svc #0
+.end

23SCR/SCR016-ARM/small.c

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+#include<unistd.h>
+#include<stdlib.h>
+int main(void){
+write(1,"Hello World!\n",13);
+exit(0);
+}