kern
annotate src/test_proc.S @ 71:c7bd6ec7b946
changed test_proc to modify memory after the fork in order to try out copy-on-write,
by pushing the result of getpid on the stack.
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Thu, 13 Oct 2011 05:22:35 +0300 |
| parents | b45e2d5f0ae1 |
| children | 8b21fe04ba2c |
| rev | line source |
|---|---|
| nuclear@51 | 1 #define ASM |
| nuclear@51 | 2 #include <syscall.h> |
| nuclear@44 | 3 |
| nuclear@44 | 4 .text |
| nuclear@44 | 5 .globl test_proc |
| nuclear@44 | 6 test_proc: |
| nuclear@57 | 7 /* fork another process */ |
| nuclear@57 | 8 movl $SYS_FORK, %eax |
| nuclear@57 | 9 int $SYSCALL_INT |
| nuclear@57 | 10 |
| nuclear@71 | 11 /* test copy-on-write by pushing the pid to the stack |
| nuclear@71 | 12 * then use this value from the stack times 2 as a sleep |
| nuclear@71 | 13 * interval in the loop. |
| nuclear@71 | 14 */ |
| nuclear@71 | 15 movl $SYS_GETPID, %eax |
| nuclear@71 | 16 int $SYSCALL_INT |
| nuclear@69 | 17 push %eax |
| nuclear@69 | 18 |
| nuclear@57 | 19 infloop: |
| nuclear@44 | 20 /* --- print a message --- */ |
| nuclear@44 | 21 movl $SYS_HELLO, %eax |
| nuclear@44 | 22 int $SYSCALL_INT |
| nuclear@44 | 23 |
| nuclear@57 | 24 |
| nuclear@60 | 25 /* --- sleep for (pid * 2) seconds --- |
| nuclear@71 | 26 * grab the pid from the stack and shift it left to |
| nuclear@71 | 27 * multiply the pid by 2. Then use that as a sleep interval |
| nuclear@71 | 28 * in seconds. |
| nuclear@60 | 29 */ |
| nuclear@71 | 30 movl (%esp), %ebx |
| nuclear@71 | 31 shl $1, %ebx |
| nuclear@44 | 32 movl $SYS_SLEEP, %eax |
| nuclear@44 | 33 int $SYSCALL_INT |
| nuclear@44 | 34 |
| nuclear@57 | 35 jmp infloop |
| nuclear@44 | 36 |
| nuclear@44 | 37 .globl test_proc_end |
| nuclear@44 | 38 test_proc_end: |