elflink: ldlinux should not have any dependencies

ldlinux currently requires the get_key() symbol, which means it has a
dependency on libutil_com.c32. ldlinux.c32 really should be a
standalone module so let's move get_key.c into ldlinux/.

However, moving get_key.c creates a new problem - native linux
applications such as com32/samples/keytest.c require the get_key()
symbol which is currently exported by libutil_lnx.a. To fix this, we
create a new native linux library that exports any required symbols
from ldlinux. With this change we need to update com32/Makefile so
that we build com32/elfink/ldlinux before com32/samples, and seeing as
ldlinux now has no dependencies, we may as well move it to the front
of $SUBDIRS.

Also, update elf_gen_dep.sh to skip ldlinux.c32 and not search for
dependencies for any of its unresolved symbols. This way, if anyone
inadvertently introduces a dependency that cannot be resolved by the
core, ldlinux.c32 will fail to load at runtime (which guarantees that
the newly introduced dependency won't go unnoticed).

Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>

1 files changed, 172 insertions, 0 deletions

diff --git a/com32/elflink/ldlinux/get_key.c b/com32/elflink/ldlinux/get_key.c
new file mode 100644
index 00000000..f277b43b
--- /dev/null
+++ b/com32/elflink/ldlinux/get_key.c
@@ -0,0 +1,172 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * get_key.c
+ *
+ * Get a single key, and try to pick apart function key codes.
+ * This doesn't decode anywhere close to all possiblities, but
+ * hopefully is enough to be useful.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/times.h>
+#include <getkey.h>
+#include <libutil.h>
+
+struct keycode {
+    int code;
+    int seqlen;
+    const unsigned char *seq;
+};
+
+#define MAXLEN 8
+#define CODE(x,y) { x, (sizeof y)-1, (const unsigned char *)(y) }
+
+static const struct keycode keycodes[] = {
+    /* First, the BIOS combined codes */
+    CODE(KEY_F1, "\0\x3B"),
+    CODE(KEY_F2, "\0\x3C"),
+    CODE(KEY_F3, "\0\x3D"),
+    CODE(KEY_F4, "\0\x3E"),
+    CODE(KEY_F5, "\0\x3F"),
+    CODE(KEY_F6, "\0\x40"),
+    CODE(KEY_F7, "\0\x41"),
+    CODE(KEY_F8, "\0\x42"),
+    CODE(KEY_F9, "\0\x43"),
+    CODE(KEY_F10, "\0\x44"),
+    CODE(KEY_F11, "\0\x85"),
+    CODE(KEY_F12, "\0\x86"),
+
+    CODE(KEY_UP, "\0\x48"),
+    CODE(KEY_DOWN, "\0\x50"),
+    CODE(KEY_LEFT, "\0\x4B"),
+    CODE(KEY_RIGHT, "\0\x4D"),
+    CODE(KEY_PGUP, "\0\x49"),
+    CODE(KEY_PGDN, "\0\x51"),
+    CODE(KEY_HOME, "\0\x47"),
+    CODE(KEY_END, "\0\x4F"),
+    CODE(KEY_INSERT, "\0\x52"),
+    CODE(KEY_DELETE, "\0\x53"),
+
+    /* Now, VT/xterm/Linux codes */
+    CODE(KEY_F1, "\033[[A"),
+    CODE(KEY_F1, "\033OP"),
+    CODE(KEY_F2, "\033[[B"),
+    CODE(KEY_F2, "\033OQ"),
+    CODE(KEY_F3, "\033[[C"),
+    CODE(KEY_F3, "\033OR"),
+    CODE(KEY_F4, "\033[[D"),
+    CODE(KEY_F4, "\033OS"),
+    CODE(KEY_F5, "\033[[E"),
+    CODE(KEY_F5, "\033[15~"),
+    CODE(KEY_F6, "\033[17~"),
+    CODE(KEY_F7, "\033[18~"),
+    CODE(KEY_F8, "\033[19~"),
+    CODE(KEY_F9, "\033[20~"),
+    CODE(KEY_F10, "\033[21~"),
+    CODE(KEY_F11, "\033[23~"),
+    CODE(KEY_F12, "\033[24~"),
+
+    CODE(KEY_UP, "\033[A"),
+    CODE(KEY_DOWN, "\033[B"),
+    CODE(KEY_LEFT, "\033[D"),
+    CODE(KEY_RIGHT, "\033[C"),
+    CODE(KEY_PGUP, "\033[5~"),
+    CODE(KEY_PGUP, "\033[V"),
+    CODE(KEY_PGDN, "\033[6~"),
+    CODE(KEY_PGDN, "\033[U"),
+    CODE(KEY_HOME, "\033[1~"),
+    CODE(KEY_HOME, "\033[H"),
+    CODE(KEY_END, "\033[4~"),
+    CODE(KEY_END, "\033[F"),
+    CODE(KEY_END, "\033OF"),
+    CODE(KEY_INSERT, "\033[2~"),
+    CODE(KEY_INSERT, "\033[@"),
+    CODE(KEY_DELETE, "\033[3~"),
+};
+
+#define NCODES ((int)(sizeof keycodes/sizeof(struct keycode)))
+
+#define KEY_TIMEOUT ((CLK_TCK+9)/10)
+
+int get_key(FILE * f, clock_t timeout)
+{
+    unsigned char buffer[MAXLEN];
+    int nc, i, rv;
+    const struct keycode *kc;
+    int another;
+    unsigned char ch;
+    clock_t start;
+
+    /* We typically start in the middle of a clock tick */
+    if (timeout)
+	timeout++;
+
+    nc = 0;
+    start = times(NULL);
+    do {
+	rv = read(fileno(f), &ch, 1);
+	if (rv == 0 || (rv == -1 && errno == EAGAIN)) {
+	    clock_t lateness = times(NULL) - start;
+	    if (nc && lateness > 1 + KEY_TIMEOUT) {
+		if (nc == 1)
+		    return buffer[0];	/* timeout in sequence */
+		else if (timeout && lateness > timeout)
+		    return KEY_NONE;
+	    } else if (!nc && timeout && lateness > timeout)
+		return KEY_NONE;	/* timeout before sequence */
+
+	    do_idle();
+
+	    another = 1;
+	    continue;
+	}
+
+	start = times(NULL);
+
+	buffer[nc++] = ch;
+
+	another = 0;
+	for (i = 0, kc = keycodes; i < NCODES; i++, kc++) {
+	    if (nc == kc->seqlen && !memcmp(buffer, kc->seq, nc))
+		return kc->code;
+	    else if (nc < kc->seqlen && !memcmp(buffer, kc->seq, nc)) {
+		another = 1;
+		break;
+	    }
+	}
+    } while (another);
+
+    /* We got an unrecognized sequence; return the first character */
+    /* We really should remember this and return subsequent characters later */
+    return buffer[0];
+}