aarch64: add freestanding port

README.md

@@ -17,7 +17,7 @@ Adding support for new architectures is easy, but you need to know assembly lang
 
 | Architecture | Works on musl | Syscall | Supports FREESTANDING |
 |--------------|---------------|---------|-----------------------|
-|    aarch64   | ✓             |         |                       |
+|    aarch64   | ✓             |         | ✓                     |
 |      arm     | ✓             |         | ✓                     |
 |     m68k     | ✓             |         | ✓                     |
 |     mips     | ✓             |         | ✓                     |

arch/aarch64/freestanding/bits.h

@@ -0,0 +1,34 @@
+#ifndef LIBUCONTEXT_BITS_H
+#define LIBUCONTEXT_BITS_H
+
+typedef unsigned long libucontext_greg_t;
+typedef unsigned long libucontext_gregset_t[34];
+
+typedef struct {
+	__uint128_t vregs[32];
+	unsigned int fpsr;
+	unsigned int fpcr;
+} libucontext_fpregset_t;
+
+typedef struct sigcontext {
+	unsigned long fault_address;
+	unsigned long regs[31];
+	unsigned long sp, pc, pstate;
+	long double __reserved[256];
+} libucontext_mcontext_t;
+
+typedef struct {
+	void *ss_sp;
+	int ss_flags;
+	size_t ss_size;
+} libucontext_stack_t;
+
+typedef struct libucontext_ucontext {
+	unsigned long uc_flags;
+	struct libucontext_ucontext *uc_link;
+	libucontext_stack_t uc_stack;
+	unsigned char __pad[128];
+	libucontext_mcontext_t uc_mcontext;
+} libucontext_ucontext_t;
+
+#endif

arch/aarch64/makecontext.c

@@ -23,7 +23,7 @@ extern void libucontext_trampoline(void);
 
 
 void
-libucontext_makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+libucontext_makecontext(libucontext_ucontext_t *ucp, void (*func)(void), int argc, ...)
 {
 	unsigned long *sp;
 	unsigned long *regp;