initial signal implementation

kernel-src/arch/x86-64/mmu.c

@@ -267,8 +267,12 @@ static void pfisr(isr_t *self, context_t *ctx) {
 	if (ctx->error & ERROR_FETCH)
 		vmmerror |= VMM_ACTION_EXEC;
 
-	if (vmm_pagefault((void *)ctx->cr2, ctx->cs != 8, vmmerror) == false)
-		_panic("Page fault", ctx);
+	if (vmm_pagefault((void *)ctx->cr2, ctx->cs != 8, vmmerror) == false) {
+		if (ARCH_CONTEXT_ISUSER(ctx))
+			signal_signalthread(_cpu()->thread, SIGSEGV, true);
+		else
+			_panic("Page fault", ctx);
+	}
 }
 
 void arch_mmu_init() {

kernel-src/arch/x86-64/syscall.asm

@@ -57,6 +57,11 @@ extern syscall_getpgid
 extern syscall_getsid
 extern syscall_setsid
 extern syscall_setpgid
+extern syscall_sigaction
+extern syscall_sigaltstack
+extern syscall_sigprocmask
+extern syscall_kill
+extern syscall_sigreturn
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -116,7 +121,12 @@ dq syscall_getpgid
 dq syscall_getsid
 dq syscall_setsid
 dq syscall_setpgid
-syscallcount equ 58
+dq syscall_sigaction
+dq syscall_sigaltstack
+dq syscall_sigprocmask
+dq syscall_kill
+dq syscall_sigreturn
+syscallcount equ 63
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/arch/x86-64/syscalllog.c

@@ -4,7 +4,7 @@
 
 #ifdef SYSCALL_LOGGING
 
-#define SYSCALL_COUNT 58
+#define SYSCALL_COUNT 63
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -65,7 +65,12 @@ static char *name[] = {
 	"getpgid",
 	"getsid",
 	"setsid",
-	"setpgid"
+	"setpgid",
+	"sigaction",
+	"sigaltstack",
+	"sigprocmask",
+	"kill",
+	"sigreturn"
 };
 
 static char *args[] = {
@@ -127,6 +132,11 @@ static char *args[] = {
 	"pid %d", // getsid
 	"N/A", // setsid
 	"pid %d pgid %d", // setpgid
+	"signal %d new %p old %p", // sigaction
+	"new %p old %p", // sigaltstack
+	"how %d set %p oldset %p", // sigprocmask
+	"pid %d signal %d", // kill
+	"N/A" // sigreturn
 };
 
 #endif