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, 30 insertions, 60 deletions

diff --git a/sys/amd64/include/signal.h b/sys/amd64/include/signal.h
index fb2d82c..baa0c4e 100644
--- a/sys/amd64/include/signal.h
+++ b/sys/amd64/include/signal.h
@@ -44,7 +44,7 @@
  * Machine-dependent signal definitions
  */
 
-typedef int sig_atomic_t;
+typedef long sig_atomic_t;
 
 #if __XSI_VISIBLE
 /*
@@ -60,7 +60,6 @@ typedef int sig_atomic_t;
 /*
  * Only the kernel should need these old type definitions.
  */
-#if defined(_KERNEL) && defined(COMPAT_43)
 /*
  * Information pushed on stack when a signal is delivered.
  * This is used by the kernel to restore state following
@@ -68,75 +67,46 @@ typedef int sig_atomic_t;
  * to the handler to allow it to restore state properly if
  * a non-standard exit is performed.
  */
-struct osigcontext {
-	int	sc_onstack;		/* sigstack state to restore */
-	osigset_t sc_mask;		/* signal mask to restore */
-	int	sc_esp;			/* machine state follows: */
-	int	sc_ebp;
-	int	sc_isp;
-	int	sc_eip;
-	int	sc_efl;
-	int	sc_es;
-	int	sc_ds;
-	int	sc_cs;
-	int	sc_ss;
-	int	sc_edi;
-	int	sc_esi;
-	int	sc_ebx;
-	int	sc_edx;
-	int	sc_ecx;
-	int	sc_eax;
-	int	sc_gs;
-	int	sc_fs;
-	int	sc_trapno;
-	int	sc_err;
-};
-#endif
-
 /*
  * The sequence of the fields/registers in struct sigcontext should match
  * those in mcontext_t.
  */
 struct sigcontext {
 	struct __sigset sc_mask;	/* signal mask to restore */
-	int	sc_onstack;		/* sigstack state to restore */
-	int	sc_gs;			/* machine state (struct trapframe) */
-	int	sc_fs;
-	int	sc_es;
-	int	sc_ds;
-	int	sc_edi;
-	int	sc_esi;
-	int	sc_ebp;
-	int	sc_isp;
-	int	sc_ebx;
-	int	sc_edx;
-	int	sc_ecx;
-	int	sc_eax;
-	int	sc_trapno;
-	int	sc_err;
-	int	sc_eip;
-	int	sc_cs;
-	int	sc_efl;
-	int	sc_esp;
-	int	sc_ss;
-	int	sc_len;			/* sizeof(mcontext_t) */
+	long	sc_onstack;		/* sigstack state to restore */
+	long	sc_r15;		/* machine state (struct trapframe) */
+	long	sc_r14;
+	long	sc_r13;
+	long	sc_r12;
+	long	sc_r11;
+	long	sc_r10;
+	long	sc_r9;
+	long	sc_r8;
+	long	sc_rdi;
+	long	sc_rsi;
+	long	sc_rbp;
+	long	sc_rbx;
+	long	sc_rdx;
+	long	sc_rcx;
+	long	sc_rax;
+	long	sc_trapno;
+	long	sc_err;
+	long	sc_rip;
+	long	sc_cs;
+	long	sc_rflags;
+	long	sc_rsp;
+	long	sc_ss;
+	long	sc_len;			/* sizeof(mcontext_t) */
 	/*
 	 * XXX - See <machine/ucontext.h> and <machine/npx.h> for
 	 *       the following fields.
 	 */
-	int	sc_fpformat;
-	int	sc_ownedfp;
-	int	sc_spare1[1];
-	int	sc_fpstate[128] __aligned(16);
-	int	sc_spare2[8];
+	long	sc_fpformat;
+	long	sc_ownedfp;
+	long	sc_spare1[1];
+	long	sc_fpstate[128] __aligned(16);
+	long	sc_spare2[8];
 };
-
-#define	sc_sp		sc_esp
-#define	sc_fp		sc_ebp
-#define	sc_pc		sc_eip
-#define	sc_ps		sc_efl
-#define	sc_eflags	sc_efl
-
 #endif /* __BSD_VISIBLE */
 
 #endif /* !_MACHINE_SIGNAL_H_ */