!signal: move signal handling to kernel

JIRA: RTOS-736

* remove default handlers, signal_common and _signals_init from libphoenix
* switch from signalHandle syscall to signalAction
* add handler address argument to signal_trampoline
* remove phx-posix signal numbers translation

Author: etiaro

arch/arm/signal.S

@@ -20,14 +20,11 @@
 .globl _signal_trampoline
 .type _signal_trampoline, %function
 _signal_trampoline:
-	/* Signal number, oldmask - keep stack aligned to 8 */
-	pop {r0,r4}
-	blx _signal_handler
+	/* Signal number, handler */
+	pop {r0, r1}
+	blx r1
 
-	mov r0, r4        /* move oldmask to r0 */
-	pop {r1,r2,r3,r4} /* cpu_context_t *, pc, psp, psr */
-
-	/* put psr back on stack, keep aligned to 8 (r5 as padding value) */
-	push {r4,r5}
+	pop {r0,r1,r2,r3} /* oldmask, cpu_context_t *, pc, psp */
+	/* psr on stack */
 	bl sigreturn
 .size _signal_trampoline, .-_signal_trampoline

include/signal.h

@@ -17,8 +17,7 @@
 #define _LIBPHOENIX_SIGNAL_H_
 
 
-#include <sys/types.h>
-#include <time.h>
+#include <phoenix/signal.h>
 
 
 #ifdef __cplusplus
@@ -28,87 +27,6 @@ extern "C" {
 
 typedef void (*sighandler_t)(int);
 
-#define SIGHUP     1
-#define SIGINT     2
-#define SIGQUIT    3
-#define SIGILL     4
-#define SIGTRAP    5
-#define SIGABRT    6
-#define SIGIOT     SIGABRT
-#define SIGEMT     7
-#define SIGFPE     8
-#define SIGKILL    9
-#define SIGBUS    10
-#define SIGSEGV   11
-#define SIGSYS    12
-#define SIGPIPE   13
-#define SIGALRM   14
-#define SIGTERM   15
-#define SIGURG    16
-#define SIGSTOP   17
-#define SIGTSTP   18
-#define SIGCONT   19
-#define SIGCHLD   20
-#define SIGTTIN   21
-#define SIGTTOU   22
-#define SIGIO     23
-#define SIGXCPU   24
-#define SIGXFSZ   25
-#define SIGVTALRM 26
-#define SIGPROF   27
-#define SIGWINCH  28
-#define SIGINFO   29
-#define SIGUSR1   30
-#define SIGUSR2   31
-
-#define NSIG 32
-
-#define SIG_ERR ((sighandler_t)-1)
-#define SIG_DFL ((sighandler_t)-2)
-#define SIG_IGN ((sighandler_t)-3)
-
-
-enum { SIG_BLOCK, SIG_SETMASK, SIG_UNBLOCK };
-
-
-#define	SA_NOCLDSTOP	1 << 0
-#define SA_NOCLDWAIT	1 << 1
-#define SA_NODEFER		1 << 2
-#define SA_ONSTACK		1 << 3
-#define	SA_RESETHAND	1 << 4
-#define	SA_RESTART		1 << 5
-#define	SA_RESTORER		1 << 6
-#define SA_SIGINFO		1 << 7
-
-
-typedef int sigset_t;
-typedef int sig_atomic_t;
-
-
-union sigval {
-	int sival_int;
-	void *sival_ptr;
-};
-
-
-typedef struct {
-	int si_signo;
-	int si_code;
-	pid_t si_pid;
-	uid_t si_uid;
-	void *si_addr;
-	int si_status;
-	union sigval si_value;
-} siginfo_t;
-
-
-struct sigaction {
-	void (*sa_handler) (int);
-	sigset_t sa_mask;
-	int sa_flags;
-	void (*sa_sigaction) (int, siginfo_t *, void *);
-};
-
 
 extern void (*bsd_signal(int, void (*)(int)))(int);
 
@@ -173,9 +91,6 @@ extern int sigsuspend(const sigset_t *);
 extern int sigwait(const sigset_t *, int *);
 
 
-extern int signalPostPosix(int pid, int tid, int signal);
-
-
 #ifdef __cplusplus
 }
 #endif

include/sys/threads.h

@@ -155,7 +155,7 @@ extern int condBroadcast(handle_t h);
 extern int resourceDestroy(handle_t h);
 
 
-extern int signalHandle(void (*handler)(void), unsigned mask, unsigned mmask);
+extern int signalAction(int signal, const struct sigaction *act, struct sigaction *oact, void (*trampoline)(void));
 
 
 extern int signalPost(int pid, int tid, int signal);

include/sys/wait.h

@@ -30,13 +30,10 @@ enum {
 };
 
 
-extern const int _signals_phx2posix[];
-
-
-#define WTERMSIG(stat_val) (_signals_phx2posix[(stat_val >> 8) & 0x7f])
-#define WEXITSTATUS(stat_val) ((stat_val) & 0xff)
-#define WIFEXITED(stat_val) (WTERMSIG(stat_val) == 0)
-#define WIFSIGNALED(stat_val) (WTERMSIG(stat_val) != 0)
+#define WTERMSIG(stat_val)     ((stat_val >> 8) & 0x7f)
+#define WEXITSTATUS(stat_val)  ((stat_val) & 0xff)
+#define WIFEXITED(stat_val)    (WTERMSIG(stat_val) == 0)
+#define WIFSIGNALED(stat_val)  (WTERMSIG(stat_val) != 0)
 #define WIFSTOPPED(stat_val) 0
 #define WSTOPSIG(stat_val) 0
 #define WIFCONTINUED(stat_val) 0

misc/init.c

@@ -16,7 +16,6 @@
 
 extern void _malloc_init(void);
 extern int _env_init(void);
-extern void _signals_init(void);
 extern void _file_init(void);
 extern void _errno_init(void);
 extern void _atexit_init(void);
@@ -30,7 +29,6 @@ void _libc_init(void)
 	_errno_init();
 	_malloc_init();
 	_env_init();
-	_signals_init();
 	_file_init();
 	_pthread_init();
 }

pthread/pthread.c

@@ -455,7 +455,7 @@ int pthread_cancel(pthread_t thread)
 				mutexUnlock(pthread_common.pthread_list_lock);
 				pthread_key_cleanup(ctx);
 				pthread_ctx_put(ctx);
-				err = signalPost(getpid(), id, signal_cancel);
+				err = signalPost(getpid(), id, PH_SIGCANCEL);
 			}
 			else {
 				_pthread_ctx_put(ctx);
@@ -1070,7 +1070,7 @@ int pthread_sigmask(int how, const sigset_t *__restrict__ set, sigset_t *__restr
 int pthread_kill(pthread_t thread, int sig)
 {
 	pthread_ctx *ctx = (pthread_ctx *)thread;
-	int ret = -signalPostPosix(getpid(), ctx->id, sig);
+	int ret = -signalPost(getpid(), ctx->id, sig);
 	return ret;
 }