1 files changed, 43 insertions, 0 deletions

diff --git a/sys/amd64/include/asmacros.h b/sys/amd64/include/asmacros.h
new file mode 100644
index 000000000000..f0f2c014178c
--- /dev/null
+++ b/sys/amd64/include/asmacros.h
@@ -0,0 +1,43 @@
+#define ALIGN_DATA	.align	2	/* 4 byte alignment, zero filled */
+#define ALIGN_TEXT	.align	2,0x90	/* 4-byte alignment, nop filled */
+#define SUPERALIGN_TEXT	.align	4,0x90	/* 16-byte alignment (better for 486), nop filled */
+
+#define GEN_ENTRY(name)		ALIGN_TEXT;	.globl name; name:
+#define NON_GPROF_ENTRY(name)	GEN_ENTRY(_/**/name)
+
+#ifdef GPROF
+/*
+ * ALTENTRY() must be before a corresponding ENTRY() so that it can jump
+ * over the mcounting.
+ */
+#define ALTENTRY(name)	GEN_ENTRY(_/**/name); MCOUNT; jmp 2f
+#define ENTRY(name)	GEN_ENTRY(_/**/name); MCOUNT; 2:
+/*
+ * The call to mcount supports the usual (bad) conventions.  We allocate
+ * some data and pass a pointer to it although the FreeBSD doesn't use
+ * the data.  We set up a frame before calling mcount because that is
+ * the standard convention although it makes work for both mcount and
+ * callers.
+ */
+#define MCOUNT		.data; ALIGN_DATA; 1:; .long 0; .text; \
+			pushl %ebp; movl %esp,%ebp; \
+			movl $1b,%eax; call mcount; popl %ebp
+#else
+/*
+ * ALTENTRY() has to align because it is before a corresponding ENTRY().
+ * ENTRY() has to align to because there may be no ALTENTRY() before it.
+ * If there is a previous ALTENTRY() then the alignment code is empty.
+ */
+#define ALTENTRY(name)	GEN_ENTRY(_/**/name)
+#define ENTRY(name)	GEN_ENTRY(_/**/name)
+
+#endif
+
+#ifdef DUMMY_NOPS			/* this will break some older machines */
+#define FASTER_NOP
+#define NOP
+#else
+#define FASTER_NOP	pushl %eax ; inb $0x84,%al ; popl %eax
+#define NOP		pushl %eax ; inb $0x84,%al ; inb $0x84,%al ; popl %eax
+#endif
+