diff options
Diffstat (limited to 'newlib/libc/sys/mmixware/_exit.c')
| -rw-r--r-- | newlib/libc/sys/mmixware/_exit.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/newlib/libc/sys/mmixware/_exit.c b/newlib/libc/sys/mmixware/_exit.c index 127bda75d..2f70154f2 100644 --- a/newlib/libc/sys/mmixware/_exit.c +++ b/newlib/libc/sys/mmixware/_exit.c @@ -18,9 +18,11 @@ void _exit (int n) { - /* Unfortunately, the return status is not returned by Knuth's mmix - simulator, so it seems in effect ineffective. We set it anyway; - there may be a purpose. */ + /* The return status is passed on at exit from the simulator by all + but the oldest versions of Knuth's mmixware simulator. Beware, + "TRAP 0,0,0" is the instruction corresponding to (int32_t) 0 and + the value 0 in $255 is common enough that a program crash jumping + to e.g. uninitialized memory will look like "exit (0)". */ __asm__ ("SET $255,%0\n\tTRAP 0,0,0" : /* No outputs. */ : "r" (n) |