Commit MD parts of a loosely functional AMD64 port. This is based on

a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to
attempt to get a stable base to start from.  There is a lot missing still.
Worth noting:
- The kernel runs at 1GB in order to cheat with the pmap code.  pmap uses
  a variation of the PAE code in order to avoid having to worry about 4
  levels of page tables yet.
- It boots in 64 bit "long mode" with a tiny trampoline embedded in the
  i386 loader.  This simplifies locore.s greatly.
- There are still quite a few fragments of i386-specific code that have
  not been translated yet, and some that I cheated and wrote dumb C
  versions of (bcopy etc).
- It has both int 0x80 for syscalls (but using registers for argument
  passing, as is native on the amd64 ABI), and the 'syscall' instruction
  for syscalls.  int 0x80 preserves all registers, 'syscall' does not.
- I have tried to minimize looking at the NetBSD code, except in a couple
  of places (eg: to find which register they use to replace the trashed
  %rcx register in the syscall instruction).  As a result, there is not a
  lot of similarity.  I did look at NetBSD a few times while debugging to
  get some ideas about what I might have done wrong in my first attempt.

1 files changed, 29 insertions, 54 deletions

diff --git a/sys/amd64/include/ucontext.h b/sys/amd64/include/ucontext.h
index ec3e0ee..1938707 100644
--- a/sys/amd64/include/ucontext.h
+++ b/sys/amd64/include/ucontext.h
@@ -37,69 +37,44 @@ typedef struct __mcontext {
 	 * sigcontext. So that we can support sigcontext
 	 * and ucontext_t at the same time.
 	 */
-	int	mc_onstack;		/* XXX - sigcontext compat. */
-	int	mc_gs;			/* machine state (struct trapframe) */
-	int	mc_fs;
-	int	mc_es;
-	int	mc_ds;
-	int	mc_edi;
-	int	mc_esi;
-	int	mc_ebp;
-	int	mc_isp;
-	int	mc_ebx;
-	int	mc_edx;
-	int	mc_ecx;
-	int	mc_eax;
-	int	mc_trapno;
-	int	mc_err;
-	int	mc_eip;
-	int	mc_cs;
-	int	mc_eflags;
-	int	mc_esp;
-	int	mc_ss;
+	register_t	mc_onstack;		/* XXX - sigcontext compat. */
+	register_t	mc_r15;			/* machine state (struct trapframe) */
+	register_t	mc_r14;
+	register_t	mc_r13;
+	register_t	mc_r12;
+	register_t	mc_r11;
+	register_t	mc_r10;
+	register_t	mc_r9;
+	register_t	mc_r8;
+	register_t	mc_rdi;
+	register_t	mc_rsi;
+	register_t	mc_rbp;
+	register_t	mc_rbx;
+	register_t	mc_rdx;
+	register_t	mc_rcx;
+	register_t	mc_rax;
+	register_t	mc_trapno;
+	register_t	mc_err;
+	register_t	mc_rip;
+	register_t	mc_cs;
+	register_t	mc_rflags;
+	register_t	mc_rsp;
+	register_t	mc_ss;
 
-	int	mc_len;			/* sizeof(mcontext_t) */
+	long	mc_len;			/* sizeof(mcontext_t) */
 #define	_MC_FPFMT_NODEV		0x10000	/* device not present or configured */
-#define	_MC_FPFMT_387		0x10001
 #define	_MC_FPFMT_XMM		0x10002
-	int	mc_fpformat;
+	long	mc_fpformat;
 #define	_MC_FPOWNED_NONE	0x20000	/* FP state not used */
 #define	_MC_FPOWNED_FPU		0x20001	/* FP state came from FPU */
 #define	_MC_FPOWNED_PCB		0x20002	/* FP state came from PCB */
-	int	mc_ownedfp;
-	int	mc_spare1[1];		/* align next field to 16 bytes */
+	long	mc_ownedfp;
+	long	mc_spare1[1];		/* align next field to 16 bytes */
 	/*
 	 * See <machine/npx.h> for the internals of mc_fpstate[].
 	 */
-	int	mc_fpstate[128] __aligned(16);
-	int	mc_spare2[8];
+	long	mc_fpstate[128] __aligned(16);
+	long	mc_spare2[8];
 } mcontext_t;
 
-#if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
-struct mcontext4 {
-	int	mc_onstack;		/* XXX - sigcontext compat. */
-	int	mc_gs;			/* machine state (struct trapframe) */
-	int	mc_fs;
-	int	mc_es;
-	int	mc_ds;
-	int	mc_edi;
-	int	mc_esi;
-	int	mc_ebp;
-	int	mc_isp;
-	int	mc_ebx;
-	int	mc_edx;
-	int	mc_ecx;
-	int	mc_eax;
-	int	mc_trapno;
-	int	mc_err;
-	int	mc_eip;
-	int	mc_cs;
-	int	mc_eflags;
-	int	mc_esp;			/* machine state */
-	int	mc_ss;
-	int	mc_fpregs[28];		/* env87 + fpacc87 + u_long */
-	int	__spare__[17];
-};
-#endif
-
 #endif /* !_MACHINE_UCONTEXT_H_ */