kern
annotate src/test_proc.S @ 76:0fe6eef16335
holy fuck, copy_on_write didn't actually do the copy!!!!
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 05 Nov 2011 04:53:46 +0200 |
| parents | c7bd6ec7b946 |
| children |
| 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@75 | 19 /* this will count the iterations */ |
| nuclear@75 | 20 xor %ecx, %ecx |
| nuclear@75 | 21 |
| nuclear@57 | 22 infloop: |
| nuclear@44 | 23 /* --- print a message --- */ |
| nuclear@44 | 24 movl $SYS_HELLO, %eax |
| nuclear@44 | 25 int $SYSCALL_INT |
| nuclear@44 | 26 |
| nuclear@57 | 27 |
| nuclear@60 | 28 /* --- sleep for (pid * 2) seconds --- |
| nuclear@71 | 29 * grab the pid from the stack and shift it left to |
| nuclear@71 | 30 * multiply the pid by 2. Then use that as a sleep interval |
| nuclear@71 | 31 * in seconds. |
| nuclear@60 | 32 */ |
| nuclear@71 | 33 movl (%esp), %ebx |
| nuclear@71 | 34 shl $1, %ebx |
| nuclear@44 | 35 movl $SYS_SLEEP, %eax |
| nuclear@44 | 36 int $SYSCALL_INT |
| nuclear@44 | 37 |
| nuclear@75 | 38 inc %ecx |
| nuclear@75 | 39 |
| nuclear@75 | 40 /* let process 2 quit after 2 iterations */ |
| nuclear@75 | 41 cmpl $2, (%esp) |
| nuclear@75 | 42 jne 1f |
| nuclear@75 | 43 cmpl $2, %ecx |
| nuclear@75 | 44 je exit_proc |
| nuclear@75 | 45 |
| nuclear@75 | 46 1: |
| nuclear@57 | 47 jmp infloop |
| nuclear@44 | 48 |
| nuclear@75 | 49 exit_proc: |
| nuclear@75 | 50 movl $SYS_EXIT, %eax |
| nuclear@75 | 51 movl $0, %ebx |
| nuclear@75 | 52 int $SYSCALL_INT |
| nuclear@75 | 53 |
| nuclear@75 | 54 /* shouldn't reach this, trap otherwise */ |
| nuclear@75 | 55 int $3 |
| nuclear@75 | 56 |
| nuclear@44 | 57 .globl test_proc_end |
| nuclear@44 | 58 test_proc_end: |