NetBSD/arm: initial support

This is more or less mechanical merge of existing NetBSD code and
ARM-specific bits from Linux/arm files.

2 files changed, 94 insertions, 0 deletions

diff --git a/emu/NetBSD/asm-arm.S b/emu/NetBSD/asm-arm.S
new file mode 100644
index 00000000..02e37396
--- /dev/null
+++ b/emu/NetBSD/asm-arm.S
@@ -0,0 +1,78 @@
+#include <machine/asm.h>
+
+/*
+ * ulong _tas(ulong*);
+ */
+#if __ARM_ARCH >= 6
+
+#if __ARM_ARCH >= 7
+#define	DMB	dmb
+#else
+#define	DMB	mcr	p15, 0, r0, c7, c10, 5
+#endif
+
+ENTRY(_tas)
+	@ args = 0, pretend = 0, frame = 0
+	@ frame_needed = 0, uses_anonymous_args = 0
+	@ link register save eliminated.
+	@ lr needed for prologue
+	DMB
+	mov	r1, r0
+	mov	r2, #0xaa
+tas1:
+	ldrex	r0, [r1]
+	cmp	r0, #0
+	bne	lockbusy
+	strex	r3, r2, [r1]
+	cmp	r3, #0
+	bne	tas1
+	DMB
+	bx	lr
+lockbusy:
+	clrex
+	bx	lr
+	END(_tas)
+
+#else	/* __ARM_ARCH <= 5*/
+
+ENTRY(_tas)
+	@ args = 0, pretend = 0, frame = 0
+	@ frame_needed = 0, uses_anonymous_args = 0
+	@ link register save eliminated.
+	@ lr needed for prologue
+	mov	r3, #1
+	mov	r1, r0
+	swp	r0, r3, [r1]
+	bx	lr
+	END(_tas)
+
+#endif	/* __ARM_ARCH <= 5*/
+
+
+/*
+ * void FPsave(void *);
+ */
+ENTRY(FPsave)
+	@ args = 0, pretend = 0, frame = 4
+	@ frame_needed = 1, uses_anonymous_args = 0
+	mov	ip, sp
+	stmfd	sp!, {fp, ip, lr, pc}
+	sub	fp, ip, #4
+	sub	sp, sp, #4
+	str	r0, [fp, #-16]
+	ldmea	fp, {fp, sp, pc}
+	END(FPsave)
+
+/*
+ * void FPrestore(void *);
+ */
+ENTRY(FPrestore)
+	@ args = 0, pretend = 0, frame = 4
+	@ frame_needed = 1, uses_anonymous_args = 0
+	mov	ip, sp
+	stmfd	sp!, {fp, ip, lr, pc}
+	sub	fp, ip, #4
+	sub	sp, sp, #4
+	str	r0, [fp, #-16]
+	ldmea	fp, {fp, sp, pc}
+	END(FPrestore)
diff --git a/emu/NetBSD/segflush-arm.c b/emu/NetBSD/segflush-arm.c
new file mode 100644
index 00000000..f4529633
--- /dev/null
+++ b/emu/NetBSD/segflush-arm.c
@@ -0,0 +1,16 @@
+#include <sys/types.h>
+#include <machine/sysarch.h>
+
+#include "dat.h"
+
+
+int
+segflush(void *a, ulong n)
+{
+	struct arm_sync_icache_args args;
+
+	args.addr = (uintptr_t)a;
+	args.len = (size_t)n;
+	sysarch(ARM_SYNC_ICACHE, (void *)&args);
+	return 0;
+}