initial commit of the arm port

this port assumes eabi calling conventions, eabi linux syscall
convention, and presence of the kernel helpers at 0xffff0f?0 needed
for threads support. otherwise it makes very few assumptions, and the
code should work even on armv4 without thumb support, as well as on
systems with thumb interworking. the bits headers declare this a
little endian system, but as far as i can tell the code should work
equally well on big endian.

some small details are probably broken; so far, testing has been
limited to qemu/aboriginal linux.

1 files changed, 40 insertions, 0 deletions

diff --git a/arch/arm/bits/user.h b/arch/arm/bits/user.h
new file mode 100644
index 00000000..1cbd94e5
--- /dev/null
+++ b/arch/arm/bits/user.h
@@ -0,0 +1,40 @@
+struct user_fpregs
+{
+	struct fp_reg {
+		unsigned sign1:1;
+		unsigned unused:15;
+		unsigned sign2:1;
+		unsigned exponent:14;
+		unsigned j:1;
+		unsigned mantissa1:31;
+		unsigned mantissa0:32;
+	} fpregs[8];
+	unsigned fpsr:32;
+	unsigned fpcr:32;
+	unsigned char ftype[8];
+	unsigned int init_flag;
+};
+
+struct user_regs
+{
+	unsigned long uregs[18];
+};
+
+struct user
+{
+	struct user_regs		regs;
+	int				u_fpvalid;
+	unsigned long			u_tsize;
+	unsigned long			u_dsize;
+	unsigned long			u_ssize;
+	unsigned long			start_code;
+	unsigned long			start_stack;
+	long				signal;
+	int				reserved;
+	struct user_regs		*u_ar0;
+	unsigned long int		magic;
+	char				u_comm[32];
+	int				u_debugreg[8];
+	struct user_fpregs		u_fp;
+	struct user_fpregs		*u_fp0;
+};