--- /dev/null
+/*
+ * Copyright (c) 1995 by Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * This source code is a product of Sun Microsystems, Inc. and is provided
+ * for unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part. Users
+ * may copy or modify this source code without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
+ * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
+ * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
+ * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
+ * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
+ *
+ * This source code is provided with no support and without any obligation on
+ * the part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
+ * SOURCE CODE OR ANY PART THEREOF.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California 94043
+ */
+
+#pragma ident "@(#) $Id: _relocate.c,v 1.4 1998/03/31 20:10:55 steve Exp $ - SMI"
+
+/* LINTLIBRARY */
+
+#include <string.h>
+#include <sys/elf_ppc.h>
+#include "_dynodump.h"
+
+
+/*
+ * NOTE: These macros will work reliably only on 32-bit 2's
+ * complement machines. The type of P in all cases should
+ * by unsigned char *
+ */
+#if defined(_BIG_ENDIAN)
+
+#define GET4(P) ((long)(((unsigned long)(P)[0] << 24) | \
+ ((unsigned long)(P)[1] << 16) | \
+ ((unsigned long)(P)[2] << 8) | \
+ (unsigned long)(P)[3]))
+#define PUT4(V, P) { \
+ (P)[0] = (unsigned char)((V) >> 24); \
+ (P)[1] = (unsigned char)((V) >> 16); \
+ (P)[2] = (unsigned char)((V) >> 8); \
+ (P)[3] = (unsigned char)(V); \
+ }
+#define GEThalf(P) ((long) (((unsigned long) (P)[0] << 8) | \
+ ((unsigned long) (P)[1])))
+#define GETword(P) GET4(P)
+#define PUThalf(V, P) { \
+ (P)[0] = ((V) >> 8); \
+ (P)[1] = ((V)); \
+ }
+#define PUTword(V, P) PUT4(V, P)
+
+#elif defined(_LITTLE_ENDIAN)
+
+#define GET4(P) ((long)(((unsigned long)(P)[0]) | \
+ ((unsigned long)(P)[1] << 8) | \
+ ((unsigned long)(P)[2] << 16) | \
+ ((unsigned long)(P)[3]) << 24))
+#define PUT4(V, P) { \
+ (P)[0] = (unsigned char)(V); \
+ (P)[1] = (unsigned char)((V) >> 8); \
+ (P)[2] = (unsigned char)((V) >> 16); \
+ (P)[3] = (unsigned char)((V) >> 24); \
+ }
+#define GEThalf(P) ((long) (((unsigned long) (P)[0]) | \
+ ((unsigned long) (P)[1] << 8)))
+#define GETword(P) GET4(P)
+#define PUThalf(V, P) { \
+ (P)[0] = (V); \
+ (P)[1] = ((V) >> 8); \
+ }
+#define PUTword(V, P) PUT4(V, P)
+
+#endif /* defined(_LITTLE_ENDIAN) */
+
+/*
+ * NAME VALUE FIELD CALCULATION
+ *
+ * R_PPC_NONE 0 none none
+ * R_PPC_ADDR32 1 word32 S + A
+ * R_PPC_ADDR24 2 low24 (S + A) >> 2
+ * R_PPC_ADDR16 3 half16 S + A
+ * R_PPC_ADDR16_LO 4 half16 #lo(S + A)
+ * R_PPC_ADDR16_HI 5 half16 #hi(S + A)
+ * R_PPC_ADDR16_HA 6 half16 #ha(S + A)
+ * R_PPC_ADDR14 7 low14 (S + A) >> 2
+ * R_PPC_ADDR14_BRTAKEN 8 low14 (S + A) >> 2
+ * R_PPC_ADDR14_BRNTAKEN 9 low14 (S + A) >> 2
+ * R_PPC_REL24 10 low24 (S + A - P) >> 2
+ * R_PPC_REL14 11 low14 (S + A - P) >> 2
+ * R_PPC_REL14_BRTAKEN 12 low14 (S + A - P) >> 2
+ * R_PPC_REL14_BRNTAKEN 13 low14 (S + A - P) >> 2
+ * R_PPC_GOT16 14 half16 G + A
+ * R_PPC_GOT16_LO 15 half16 #lo(G + A)
+ * R_PPC_GOT16_HI 16 half16 #hi(G + A)
+ * R_PPC_GOT16_HA 17 half16 #ha(G + A)
+ * R_PPC_PLT24 18 low24 (L + A - P) >> 2
+ * R_PPC_COPY 19 none none
+ * R_PPC_GLOB_DAT 20 word32 S + A
+ * R_PPC_JMP_SLOT 21 none see below
+ * R_PPC_RELATIVE 22 word32 B + A
+ * R_PPC_LOCAL24PC 23 low24 see below
+ * R_PPC_UADDR32 24 word32 S + A
+ * R_PPC_UADDR16 25 half16 S + A
+ *
+ * This is Figure 4-3: Relocation Types from the Draft Copy of
+ * the ABI, Printed on 7/25/94.
+ *
+ * The field column specifies how much of the data
+ * at the reference address is to be used. The data are assumed to be
+ * right-justified with the least significant bit at the right.
+ * In the case of plt24 addresses, the reference address is
+ * assumed to be that of a 6-word PLT entry. The address is the right-
+ * most 24 bits of the third word.
+ */
+static void
+move_reloc(unsigned char *iaddr, unsigned char *oaddr, unsigned char type)
+{
+ switch(type) {
+ case R_PPC_NONE:
+ break;
+
+ case R_PPC_ADDR32:
+ case R_PPC_UADDR32:
+ PUTword(GETword(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR24:
+ case R_PPC_REL24:
+ case R_PPC_PLT24:
+ case R_PPC_LOCAL24PC:
+ /* XXX - big assumption here that the original contents were masked
+ * properly. If this assumption proves correct, then these 24bit
+ * cases can be folded into the above 32bit cases.
+ */
+ PUTword(GETword(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR16:
+ case R_PPC_UADDR16:
+ case R_PPC_GOT16:
+ PUThalf(GEThalf(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR16_LO:
+ case R_PPC_GOT16_LO:
+ /* XXX - more assumptions which if proved correct, we can
+ * do some folding with above cases
+ */
+ PUThalf(GEThalf(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR16_HI:
+ case R_PPC_GOT16_HI:
+ /* XXX - more assumptions which if proved correct, we can
+ * do some folding with above cases
+ */
+ PUThalf(GEThalf(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR16_HA:
+ case R_PPC_GOT16_HA:
+ /* XXX - more assumptions which if proved correct, we can
+ * do some folding with above cases
+ */
+ PUThalf(GEThalf(iaddr), oaddr);
+ break;
+
+ case R_PPC_ADDR14:
+ case R_PPC_ADDR14_BRTAKEN:
+ case R_PPC_ADDR14_BRNTAKEN:
+ case R_PPC_REL14:
+ case R_PPC_REL14_BRTAKEN:
+ case R_PPC_REL14_BRNTAKEN:
+ /* XXX - big assumption here that the original contents were masked
+ * properly. If this assumption proves correct, then these 14bit
+ * cases can be folded into the above 32bit cases.
+ */
+ PUTword(GETword(iaddr), oaddr);
+ break;
+
+ case R_PPC_COPY:
+ break;
+
+ case R_PPC_GLOB_DAT:
+ case R_PPC_RELATIVE:
+ PUTword(GETword(iaddr), oaddr);
+ break;
+
+ case R_PPC_JMP_SLOT:
+ break;
+
+ default:
+ break;
+ }
+}
+
+void
+update_reloc(Cache *ocache, Cache *_ocache, Cache *icache, Cache *_icache, Half shnum)
+{
+ Shdr *shdr;
+ Rel *rels;
+ int reln, cnt;
+ Cache *orcache, * ircache;
+
+ /*
+ * Set up to read the output relocation table.
+ */
+ shdr = _ocache->c_shdr;
+ rels = (Rel *)_ocache->c_data->d_buf;
+ reln = shdr->sh_size / shdr->sh_entsize;
+
+ /*
+ * Determine the section that is being relocated.
+ */
+ orcache = &ocache[shdr->sh_info];
+ shdr = _icache->c_shdr;
+ ircache = &icache[shdr->sh_info];
+
+ /*
+ * Loop through the relocation table.
+ */
+ for (cnt = 0; cnt < reln; cnt++, rels++) {
+ unsigned char type = ELF_R_TYPE(rels->r_info);
+
+ /*
+ * Ignore some relocations as these can safely be carried out
+ * twice (they simply override any existing data). In fact,
+ * some relocations like __iob's copy relocation must be carried
+ * out each time the process restarts otherwise stdio blows up.
+ */
+ if ((type == R_PPC_COPY) || (type == R_PPC_JMP_SLOT) ||
+ (type == R_PPC_NONE))
+ continue;
+
+ {
+ unsigned char *iaddr, *oaddr;
+ Addr off;
+
+ /*
+ * If we are required to restore the relocation location
+ * to its value prior to relocation, then read the
+ * locations original contents from the input image and
+ * copy it to the output image.
+ */
+ off = rels->r_offset - ircache->c_shdr->sh_addr;
+ iaddr = (unsigned char *)ircache->c_data->d_buf + off;
+ oaddr = (unsigned char *)orcache->c_data->d_buf + off;
+ move_reloc(iaddr, oaddr, type);
+ }
+ }
+}
projects / chise / xemacs-chise.git.1 / blobdiff