Fix build scripts, align some code, make a workable test

build.sh

@@ -10,6 +10,7 @@ clang -fPIC -nostdlib -I "include" -g "src/ciabatta.c" -c -o "bin/ciabatta.o"
 rm "$LIB_FILE" 2> /dev/null
 
 if [ "$1" != "-shared" ]; then
+    [ -f "lib/ciabatta.a" ] && rm "lib/ciabatta.a"
     llvm-ar -q "lib/ciabatta.a" "bin/crt_ctors.o" "bin/crt_entry.o" "bin/ciabatta.o"
 else
     clang -fPIC -nostdlib -shared -o "lib/ciabatta.so" "bin/ciabatta.o"

src/linux/crt_entry.asm

@@ -24,7 +24,7 @@ _start:
     pop rsi
     mov rdx, qword [rsp]
     ;; Align stack to 16, push junk and stack ptr
-    and rsi, ~0xf
+    and rsp, ~0xf
     push rax
     push rsp
     ;; Push fini and init sections

src/linux/entry.c

@@ -1,4 +1,10 @@
 
+
+int __stack_chk_fial() {
+    // TODO: implement proper stack protector support
+    return 0;
+}
+
 void __libc_start_main(
     int (*main)(int, char**, char**),
     int argc, char **argv,
@@ -7,5 +13,7 @@ void __libc_start_main(
     void (*rtld_fini)(void),
     void *stack_end
 ) {
+    static char string[] = "Hello, world!\n";
+    syscall_write(STDOUT_FILENO, string, sizeof string);
     syscall_exit(0);
 }

src/linux/syscall.c

@@ -1,67 +1,71 @@
 
 #if os_is_linux()
 
-#define SYS_read 0
+#define STDIN_FILENO  0
-#define SYS_write 1
+#define STDOUT_FILENO 1
-#define SYS_open 2
+#define STDERR_FILENO 2
-#define SYS_close 3
+
-#define SYS_stat 4
+#define SYS_read           0
-#define SYS_fstat 5
+#define SYS_write          1
-#define SYS_lstat 6
+#define SYS_open           2
-#define SYS_poll 7
+#define SYS_close          3
-#define SYS_lseek 8
+#define SYS_stat           4
-#define SYS_mmap 9
+#define SYS_fstat          5
-#define SYS_mprotect 10
+#define SYS_lstat          6
-#define SYS_munmap 11
+#define SYS_poll           7
-#define SYS_brk 12
+#define SYS_lseek          8
-#define SYS_rt_sigaction 13
+#define SYS_mmap           9
+#define SYS_mprotect       10
+#define SYS_munmap         11
+#define SYS_brk            12
+#define SYS_rt_sigaction   13
 #define SYS_rt_sigprocmask 14
-#define SYS_rt_sigreturn 15
+#define SYS_rt_sigreturn   15
-#define SYS_ioctl 16
+#define SYS_ioctl          16
-#define SYS_pread64 17
+#define SYS_pread64        17
-#define SYS_pwrite64 18
+#define SYS_pwrite64       18
-#define SYS_readv 19
+#define SYS_readv          19
-#define SYS_writev 20
+#define SYS_writev         20
-#define SYS_access 21
+#define SYS_access         21
-#define SYS_pipe 22
+#define SYS_pipe           22
-#define SYS_select 23
+#define SYS_select         23
-#define SYS_sched_yield 24
+#define SYS_sched_yield    24
-#define SYS_mremap 25
+#define SYS_mremap         25
-#define SYS_msync 26
+#define SYS_msync          26
-#define SYS_mincore 27
+#define SYS_mincore        27
-#define SYS_madvise 28
+#define SYS_madvise        28
-#define SYS_shmget 29
+#define SYS_shmget         29
-#define SYS_shmat 30
+#define SYS_shmat          30
-#define SYS_shmctl 31
+#define SYS_shmctl         31
-#define SYS_dup 32
+#define SYS_dup            32
-#define SYS_dup2 33
+#define SYS_dup2           33
-#define SYS_pause 34
+#define SYS_pause          34
-#define SYS_nanosleep 35
+#define SYS_nanosleep      35
-#define SYS_getitimer 36
+#define SYS_getitimer      36
-#define SYS_alarm 37
+#define SYS_alarm          37
-#define SYS_setitimer 38
+#define SYS_setitimer      38
-#define SYS_getpid 39
+#define SYS_getpid         39
-#define SYS_sendfile 40
+#define SYS_sendfile       40
-#define SYS_socket 41
+#define SYS_socket         41
-#define SYS_connect 42
+#define SYS_connect        42
-#define SYS_accept 43
+#define SYS_accept         43
-#define SYS_sendto 44
+#define SYS_sendto         44
-#define SYS_recvfrom 45
+#define SYS_recvfrom       45
-#define SYS_sendmsg 46
+#define SYS_sendmsg        46
-#define SYS_recvmsg 47
+#define SYS_recvmsg        47
-#define SYS_shutdown 48
+#define SYS_shutdown       48
-#define SYS_bind 49
+#define SYS_bind           49
-#define SYS_listen 50
+#define SYS_listen         50
-#define SYS_getsockname 51
+#define SYS_getsockname    51
-#define SYS_getpeername 52
+#define SYS_getpeername    52
-#define SYS_socketpair 53
+#define SYS_socketpair     53
-#define SYS_setsockopt 54
+#define SYS_setsockopt     54
-#define SYS_getsockopt 55
+#define SYS_getsockopt     55
-#define SYS_clone 56
+#define SYS_clone          56
-#define SYS_fork 57
+#define SYS_fork           57
-#define SYS_vfork 58
+#define SYS_vfork          58
-#define SYS_execve 59
+#define SYS_execve         59
-#define SYS_exit 60
+#define SYS_exit           60
 
 // Syscall stubs