perche se faccio un programma ad esempio :
e poi prendo il codice assembly con GDBcodice:int main(){ printf ("%s","Ciauuu - Benvenuto in GalatolOS !\n"); printf ("%s","Come Ti Chiami : "); char nome[500]; scanf("%s",nome); printf ("%s","Ciao ",nome); }
lo metto in un file (boot.asm) non va?codice:federico@crash-overflow:~/GalatolOS$ gdb main GNU gdb 6.6-debian Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i486-linux-gnu"... Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". (gdb) disass main Dump of assembler code for function main: 0x08048208 <main+0>: lea 0x4(%esp),%ecx 0x0804820c <main+4>: and $0xfffffff0,%esp 0x0804820f <main+7>: pushl 0xfffffffc(%ecx) 0x08048212 <main+10>: push %ebp 0x08048213 <main+11>: mov %esp,%ebp 0x08048215 <main+13>: push %ecx 0x08048216 <main+14>: sub $0x214,%esp 0x0804821c <main+20>: mov %gs:0x14,%eax 0x08048222 <main+26>: mov %eax,0xfffffff8(%ebp) 0x08048225 <main+29>: xor %eax,%eax 0x08048227 <main+31>: movl $0x809e4e8,(%esp) 0x0804822e <main+38>: call 0x8048cf0 <puts> 0x08048233 <main+43>: movl $0x809e50a,0x4(%esp) 0x0804823b <main+51>: movl $0x809e51c,(%esp) 0x08048242 <main+58>: call 0x8048c90 <printf> 0x08048247 <main+63>: lea 0xfffffe04(%ebp),%eax 0x0804824d <main+69>: mov %eax,0x4(%esp) 0x08048251 <main+73>: movl $0x809e51c,(%esp) 0x08048258 <main+80>: call 0x8048cc0 <scanf> 0x0804825d <main+85>: lea 0xfffffe04(%ebp),%eax 0x08048263 <main+91>: mov %eax,0x8(%esp) 0x08048267 <main+95>: movl $0x809e51f,0x4(%esp) ---Type <return> to continue, or q <return> to quit--- 0x0804826f <main+103>: movl $0x809e51c,(%esp) 0x08048276 <main+110>: call 0x8048c90 <printf> 0x0804827b <main+115>: mov 0xfffffff8(%ebp),%edx 0x0804827e <main+118>: xor %gs:0x14,%edx 0x08048285 <main+125>: je 0x804828c <main+132> 0x08048287 <main+127>: call 0x8050d70 <__stack_chk_fail> 0x0804828c <main+132>: add $0x214,%esp 0x08048292 <main+138>: pop %ecx 0x08048293 <main+139>: pop %ebp 0x08048294 <main+140>: lea 0xfffffffc(%ecx),%esp 0x08048297 <main+143>: ret End of assembler dump. (gdb)
boot.asm:
PS. esiste un altro programma per prendere il codice assembly???codice:lea 0x4(%esp),%ecx and $0xfffffff0,%esp pushl 0xfffffffc(%ecx) push %ebp mov %esp,%ebp push %ecx sub $0x214,%esp mov %gs:0x14,%eax mov %eax,0xfffffff8(%ebp) xor %eax,%eax movl $0x809e4e8,(%esp) call 0x8048cf0 <puts> movl $0x809e50a,0x4(%esp) movl $0x809e51c,(%esp) call 0x8048c90 <printf> lea 0xfffffe04(%ebp),%eax mov %eax,0x4(%esp) movl $0x809e51c,(%esp) call 0x8048cc0 <scanf> lea 0xfffffe04(%ebp),%eax mov %eax,0x8(%esp) movl $0x809e51f,0x4(%esp) movl $0x809e51c,(%esp) call 0x8048c90 <printf> mov 0xfffffff8(%ebp),%edx xor %gs:0x14,%edx je 0x804828c <main+132> call 0x8050d70 <__stack_chk_fail> add $0x214,%esp pop %ecx pop %ebp lea 0xfffffffc(%ecx),%esp ret
GRAZIEEEE
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