initial import of NetBSD tree

1 files changed, 517 insertions, 0 deletions

diff --git a/gnu/usr.bin/ld/ns32k/md.c b/gnu/usr.bin/ld/ns32k/md.c
new file mode 100644
index 00000000000..0d3f1d0b951
--- /dev/null
+++ b/gnu/usr.bin/ld/ns32k/md.c
@@ -0,0 +1,517 @@
+/*	$NetBSD: md.c,v 1.6 1994/11/30 06:20:42 phil Exp $  */
+/*
+ * Copyright (c) 1993 Paul Kranenburg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Paul Kranenburg.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sys/param.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <a.out.h>
+#include <stab.h>
+#include <string.h>
+
+#include "ld.h"
+
+/*
+ * Put little endian VAL of size N at ADDR
+ */
+static void
+put_num(addr, val, n)
+unsigned char	*addr;
+long		val;
+char		n;
+{
+	while (n--) {
+		*addr++ = val;
+		val >>= 8;
+	}
+}
+
+/*
+ * Get little endian of size N at ADDR
+ */
+static unsigned long
+get_num(addr, n)
+unsigned char	*addr;
+int		n;
+{
+	int val = 0;
+
+	addr += (n - 1);
+	while (n--)
+		val = val * 256 + *addr--;
+
+	return val;
+}
+
+/*
+ * Put big endian VAL of size N at ADDR
+ */
+static void
+put_imm(addr, val, n)
+unsigned char	*addr;
+unsigned long	val;
+char    	n;
+{
+	addr += (n - 1);
+	while (n--) {
+		*addr-- = val;
+		val >>= 8;
+	}
+}
+
+/*
+ * Get big endian of size N at ADDR
+ */
+static unsigned long
+get_imm(addr, n)
+unsigned char	*addr;
+int 		n;
+{
+	int val = 0;
+
+	while (n--)
+  		val = val * 256 + *addr++;
+
+	return val;
+}
+
+/*
+ * Displacements are big endian with the size
+ * encoded in the two top bits:
+ * Byte:	0xxxxxxx
+ * Word:	10xxxxxx xxxxxxxx
+ * Double word:	11xxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
+ */
+
+/*
+ * Signextend VAL from bit N
+ */
+static long
+sign_extend(val, n)
+int	val, n;
+{
+	val = val & ((1 << n) - 1);
+	return (val & (1 << (n - 1))?
+			val | (~((1 << n) - 1))
+		:
+			val
+		);
+}
+
+/*
+ * Put ns32k displacement VAL of size N at ADDR
+ */
+static void
+put_disp(addr, val, n)
+unsigned char	*addr;
+long		val;
+char		n;
+{
+	switch (n) {
+	case 1:
+		if (val < -64 || val > 63)
+			warnx("Byte displacement %d, out of range.", val);
+		val &= 0x7f;
+		*addr++ = val;
+		break;
+	case 2:
+		if (val < -8192 || val > 8191)
+			warnx("Word displacement %d, out of range.", val);
+		val &= 0x3fff;
+		val |= 0x8000;
+		*addr++ = (val >> 8);
+		*addr++ = val;
+		break;
+	case 4:
+#if 1
+		if (val < -0x1f000000 || val >= 0x20000000)
+#else
+		if (val < -0x20000000 || val >= 0x20000000)
+#endif
+			warnx("Double word displacement %d, out of range", val);
+		val |= 0xc0000000;
+		*addr++ = (val >> 24);
+		*addr++ = (val >> 16);
+		*addr++ = (val >> 8);
+		*addr++ = val;
+		break;
+	default:
+		errx(1, "internal error: putdisp: n = %d", n);
+	}
+}
+
+/*
+ * Get ns32k displacement size N at ADDR
+ */
+static unsigned long
+get_disp(addr, n)
+unsigned char	*addr;
+int		n;
+{
+	unsigned long Ivalue;
+
+	Ivalue = *addr++ & 0xff;
+	if (n == 0) {
+		if (Ivalue & 0x80) {
+			if (Ivalue & 0x40)
+				n = 4;
+			else
+				n = 2;
+		} else
+			n = 1;
+	}
+
+	switch (n) {
+	case 1:
+		Ivalue = sign_extend(Ivalue, 7);
+		break;
+	case 2:
+		Ivalue = sign_extend(Ivalue, 6);
+		Ivalue = (Ivalue << 8) | *addr;
+		break;
+	case 4:
+		Ivalue = sign_extend (Ivalue, 6);
+		Ivalue = (Ivalue << 8) | *addr++;
+		Ivalue = (Ivalue << 8) | *addr++;
+		Ivalue = (Ivalue << 8) | *addr;
+		break;
+	default:
+		errx(1, "get_disp: invalid argument %d\n", n);
+	}
+	return Ivalue;
+}
+
+/*
+ * Get relocation addend corresponding to relocation record RP
+ * from address ADDR
+ */
+long
+md_get_addend(rp, addr)
+struct relocation_info	*rp;
+unsigned char		*addr;
+{
+	int bytes = 1 << RELOC_TARGET_SIZE(rp);
+
+	switch (rp->r_disp) {
+	case 0:
+		return get_imm(addr, bytes);
+	case 1:
+		return get_disp(addr, bytes);
+	case 2:
+		return get_num(addr, bytes);
+	}
+}
+
+/*
+ * Put RELOCATION at ADDR according to relocation record RP.
+ */
+void
+md_relocate(rp, relocation, addr, relocatable_output)
+struct relocation_info	*rp;
+long			relocation;
+unsigned char		*addr;
+{
+	int bytes = 1 << RELOC_TARGET_SIZE(rp);
+
+	switch (rp->r_disp) {
+	case 0:
+		return put_imm(addr, relocation, bytes);
+	case 1:
+		return put_disp(addr, relocation, bytes);
+	case 2:
+		return put_num(addr, relocation, bytes);
+	}
+#ifdef RTLD
+	_cachectl (addr, bytes); /* maintain cache coherency */
+#endif
+}
+
+/*
+ * Machine dependent part of claim_rrs_reloc().
+ * Set RRS relocation type.
+ */
+int
+md_make_reloc(rp, r, type)
+struct relocation_info	*rp, *r;
+int			type;
+{
+	/* Relocation size */
+	r->r_length = rp->r_length;
+
+	/* Data type */
+	r->r_disp = rp->r_disp;
+
+	if (RELOC_PCREL_P(rp))
+		r->r_pcrel = 1;
+
+	if (type & RELTYPE_RELATIVE)
+		r->r_relative = 1;
+
+	if (type & RELTYPE_COPY)
+		r->r_copy = 1;
+
+	return 0;
+}
+
+/*
+ * Set up a transfer from jmpslot at OFFSET (relative to the PLT table)
+ * to the binder slot (which is at offset 0 of the PLT).
+ */
+void
+md_make_jmpslot(sp, offset, index)
+jmpslot_t	*sp;
+long		offset;
+long		index;
+{
+	/*
+	 * On ns32k machines, a long branch offset is relative to
+	 * the address of the branch instruction.
+	 */
+
+	put_num(sp->code, BSR, 2);
+	put_disp(sp->code + 2, -offset - 1, 4);
+	sp->reloc_index = index;
+#ifdef RTLD
+	_cachectl (sp->code, 6);	/* maintain cache coherency */
+#endif
+}
+
+/*
+ * Set up a "direct" transfer (ie. not through the run-time binder) from
+ * jmpslot at OFFSET to ADDR. Used by `ld' when the SYMBOLIC flag is on,
+ * and by `ld.so' after resolving the symbol.
+ * On the ns32k, we use the BR instruction which is PC relative, so no
+ * further RRS relocations will be necessary for such a jmpslot.
+ */
+void
+md_fix_jmpslot(sp, offset, addr)
+jmpslot_t	*sp;
+long		offset;
+u_long		addr;
+{
+	put_num(sp->code, BR, 2);
+	put_disp(sp->code + 2, addr - offset - 1, 4);
+	sp->reloc_index = 0;
+#ifdef RTLD
+	_cachectl (sp->code, 6);	/* maintain cache coherency */
+#endif
+}
+
+/*
+ * Update the relocation record for a RRS jmpslot.
+ */
+void
+md_make_jmpreloc(rp, r, type)
+struct relocation_info	*rp, *r;
+int			type;
+{
+	jmpslot_t	*sp;
+
+	/*
+	 * Fix relocation address to point to the correct
+	 * location within this jmpslot.
+	 */
+	r->r_address++;
+
+	/* Relocation size */
+	r->r_length = 2;
+
+	/* Data type */
+	r->r_disp = 1;
+
+	/* Set relocation type */
+	r->r_jmptable = 1;
+
+	if (type & RELTYPE_RELATIVE)
+		r->r_relative = 1;
+}
+
+/*
+ * Set relocation type for a RRS GOT relocation.
+ */
+void
+md_make_gotreloc(rp, r, type)
+struct relocation_info	*rp, *r;
+int			type;
+{
+	r->r_baserel = 1;
+	if (type & RELTYPE_RELATIVE)
+		r->r_relative = 1;
+
+	/* Relocation size */
+	r->r_length = 2;
+
+	/* Data type */
+	r->r_disp = 2;
+}
+
+/*
+ * Set relocation type for a RRS copy operation.
+ */
+void
+md_make_cpyreloc(rp, r)
+struct relocation_info	*rp, *r;
+{
+	/* Relocation size */
+	r->r_length = 2;
+
+	/* Data type */
+	r->r_disp = 2;
+
+	r->r_copy = 1;
+}
+
+void
+md_set_breakpoint(where, savep)
+long	where;
+long	*savep;
+{
+	*savep = *(long *)where;
+	*(short *)where = BPT;
+}
+
+#ifndef RTLD
+/*
+ * Initialize (output) exec header such that useful values are
+ * obtained from subsequent N_*() macro evaluations.
+ */
+void
+md_init_header(hp, magic, flags)
+struct exec	*hp;
+int		magic, flags;
+{
+	if (oldmagic)
+		hp->a_midmag = oldmagic;
+	else
+		N_SETMAGIC((*hp), magic, MID_MACHINE, flags);
+
+	/* TEXT_START depends on the value of outheader.a_entry.  */
+	if (!(link_mode & SHAREABLE))
+		hp->a_entry = PAGSIZ;
+}
+#endif /* RTLD */
+
+
+#ifdef NEED_SWAP
+/*
+ * Byte swap routines for cross-linking.
+ */
+
+void
+md_swapin_exec_hdr(h)
+struct exec *h;
+{
+	int skip = 0;
+
+	if (!N_BADMAG(*h))
+		skip = 1;
+
+	swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
+}
+
+void
+md_swapout_exec_hdr(h)
+struct exec *h;
+{
+	/* NetBSD: Always leave magic alone */
+	int skip = 1;
+#if 0
+	if (N_GETMAGIC(*h) == OMAGIC)
+		skip = 0;
+#endif
+
+	swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
+}
+
+
+void
+md_swapin_reloc(r, n)
+struct relocation_info *r;
+int n;
+{
+	int	bits;
+
+	for (; n; n--, r++) {
+		r->r_address = md_swap_long(r->r_address);
+		bits = ((int *)r)[1];
+		r->r_symbolnum = md_swap_long(bits) & 0xffffff;
+		bits = ((unsigned char *)r)[7];
+		r->r_pcrel = ((bits >> 7) & 1);
+		r->r_length = ((bits >> 5) & 3);
+		r->r_extern = ((bits >> 4) & 1);
+		r->r_baserel = ((bits >> 3) & 1);
+		r->r_jmptable = ((bits >> 2) & 1);
+		r->r_relative = ((bits >> 1) & 1);
+#ifdef N_SIZE
+		r->r_copy = (bits & 1);
+#endif
+	}
+}
+
+void
+md_swapout_reloc(r, n)
+struct relocation_info *r;
+int n;
+{
+	int	bits;
+
+	for (; n; n--, r++) {
+		r->r_address = md_swap_long(r->r_address);
+		((int *)r)[1] = md_swap_long(r->r_symbolnum & 0xffffff00);
+		bits = ((r->r_pcrel << 7) & 0x80);
+		bits |= ((r->r_length << 5) & 0x60);
+		bits |= ((r->r_extern << 4) & 0x10);
+		bits |= ((r->r_baserel << 3) & 8);
+		bits |= ((r->r_jmptable << 2) & 4);
+		bits |= ((r->r_relative << 1) & 2);
+#ifdef N_SIZE
+		bits |= (r->r_copy & 1);
+#endif
+		((unsigned char *)r)[7] = bits;
+	}
+}
+
+void
+md_swapout_jmpslot(j, n)
+jmpslot_t	*j;
+int		n;
+{
+	for (; n; n--, j++) {
+		j->opcode = md_swap_short(j->opcode);
+		j->addr[0] = md_swap_short(j->addr[0]);
+		j->addr[1] = md_swap_short(j->addr[1]);
+		j->reloc_index = md_swap_short(j->reloc_index);
+	}
+}
+
+#endif /* NEED_SWAP */