diff options
| -rw-r--r-- | src/init/main.c | 10 | ||||
| -rw-r--r-- | src/kernel/syscalls.c | 10 | ||||
| -rw-r--r-- | src/kernel/syscalls.h | 2 |
3 files changed, 19 insertions, 3 deletions
diff --git a/src/init/main.c b/src/init/main.c index 33a4372..84475da 100644 --- a/src/init/main.c +++ b/src/init/main.c @@ -4,6 +4,11 @@ int _syscall(int, int, int, int); +void exit(const char *msg, size_t len) { + _syscall(SC_EXIT, (void*)msg, len, 0); + __builtin_unreachable(); +} + int debuglog(const char *msg, size_t len) { return _syscall(SC_DEBUGLOG, (void*)msg, len, 0); } @@ -13,7 +18,6 @@ int main() { debuglog("hello from init! ", sizeof("hello from init! ") - 1); - // try to mess with kernel memory - uint8_t *kernel = (void*) 0x100000; - *kernel = 0; // should segfault + exit( "bye from init! ", + sizeof("bye from init! ") - 1); } diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c index 24706d3..1bc1a44 100644 --- a/src/kernel/syscalls.c +++ b/src/kernel/syscalls.c @@ -4,6 +4,13 @@ #include <kernel/syscalls.h> #include <stdint.h> +int sc_exit(const char *msg, size_t len) { + // the message is currently ignored + + log_const("last process returned. "); + panic(); +} + int sc_debuglog(const char *msg, size_t len) { struct pagedir *pages = process_current->pages; void *phys = pagedir_virt2phys(pages, msg, true, false); @@ -23,6 +30,9 @@ int syscall_handler(int num, int a, int b, int c, void *stack, void *eip) { process_current->eip = eip; switch (num) { + case SC_EXIT: + sc_exit((void*)a, b); + panic(); // sc_exit should never return case SC_DEBUGLOG: return sc_debuglog((void*)a, b); default: diff --git a/src/kernel/syscalls.h b/src/kernel/syscalls.h index 39db6a9..a249046 100644 --- a/src/kernel/syscalls.h +++ b/src/kernel/syscalls.h @@ -2,5 +2,7 @@ // not caring about stable syscall numbers just yet enum { + SC_EXIT, + SC_DEBUGLOG }; |