arm64: Add signal handling and forking

Change-Id: I8fd41bf5c540bcb2b9347aae47ad8bb86a6a6964
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10605
Reviewed-by: waddlesplash <[email protected]>
Tested-by: Commit checker robot <[email protected]>

headers/private/kernel/arch/arm64/arch_cpu.h

@@ -119,34 +119,6 @@ ADDRESS_TRANSLATE_FUNC(s1e1r)
 ADDRESS_TRANSLATE_FUNC(s1e1w)
 
 
-struct aarch64_fpu_state
-{
-	uint64 regs[32 * 2];
-	uint64 fpsr;
-	uint64 fpcr;
-};
-
-
-/* raw exception frames */
-struct iframe {
-	// return info
-	uint64 elr;
-	uint64 spsr;
-	uint64 x[29];
-	uint64 fp;
-	uint64 lr;
-	uint64 sp;
-	uint64 tpidr;
-
-	// exception info
-	uint64 esr;
-	uint64 far;
-
-	// fpu
-	struct aarch64_fpu_state fpu;
-};
-
-
 #ifdef __cplusplus
 namespace BKernel {
 	struct Thread;

headers/private/kernel/arch/arm64/arch_thread_types.h

@@ -11,6 +11,35 @@
 
 #define	IFRAME_TRACE_DEPTH 4
 
+
+struct aarch64_fpu_state
+{
+	uint64 regs[32 * 2];
+	uint64 fpsr;
+	uint64 fpcr;
+};
+
+
+/* raw exception frames */
+struct iframe {
+	// return info
+	uint64 elr;
+	uint64 spsr;
+	uint64 x[29];
+	uint64 fp;
+	uint64 lr;
+	uint64 sp;
+	uint64 tpidr;
+
+	// exception info
+	uint64 esr;
+	uint64 far;
+
+	// fpu
+	struct aarch64_fpu_state fpu;
+};
+
+
 struct iframe_stack {
 	struct iframe *frames[IFRAME_TRACE_DEPTH];
 	int32	index;
@@ -20,17 +49,21 @@ struct iframe_stack {
 struct arch_thread {
 	uint64 regs[14]; // x19-x30, sp, tpidr_el0
 	uint64 fp_regs[8]; // d8-d15
+	uint64 old_x0;
 
 	// used to track interrupts on this thread
 	struct iframe_stack	iframes;
 };
 
+
 struct arch_team {
 	int			dummy;
 };
 
+
 struct arch_fork_arg {
-	int			dummy;
+	struct iframe frame;
 };
 
+
 #endif /* _KERNEL_ARCH_ARM64_ARCH_THREAD_TYPES_H_ */

headers/private/system/arch/arm64/arch_commpage_defs.h

@@ -11,5 +11,6 @@
 #endif
 
 #define COMMPAGE_ENTRY_ARM64_THREAD_EXIT (COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 0)
+#define COMMPAGE_ENTRY_ARM64_SIGNAL_HANDLER (COMMPAGE_ENTRY_FIRST_ARCH_SPECIFIC + 1)
 
 #endif	/* _SYSTEM_ARCH_ARM64_COMMPAGE_DEFS_H */