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