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authorDavid Henkel-Wallace <gumby@cygnus>1991-03-21 21:29:06 +0000
committerDavid Henkel-Wallace <gumby@cygnus>1991-03-21 21:29:06 +0000
commit2fa0b342a5cd580781d2b9348a87f33a92d363fa (patch)
treee9729ab1630b7dbad885ed5601c51bf34c8ff8f4 /ld/ldexp.c
parent6fd9467324a5ebe73ee7e88e0b2e3a2049e4023f (diff)
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Initial revision
Diffstat (limited to 'ld/ldexp.c')
-rw-r--r--ld/ldexp.c770
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diff --git a/ld/ldexp.c b/ld/ldexp.c
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--- /dev/null
+++ b/ld/ldexp.c
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+/* Copyright (C) 1991 Free Software Foundation, Inc.
+
+This file is part of GLD, the Gnu Linker.
+
+GLD is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GLD is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GLD; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/*
+ $Id$
+
+ $Log$
+ Revision 1.1 1991/03/21 21:28:34 gumby
+ Initial revision
+
+ * Revision 1.1 1991/03/13 00:48:16 chrisb
+ * Initial revision
+ *
+ * Revision 1.6 1991/03/10 09:31:22 rich
+ * Modified Files:
+ * Makefile config.h ld-emul.c ld-emul.h ld-gld.c ld-gld960.c
+ * ld-lnk960.c ld.h lddigest.c ldexp.c ldexp.h ldfile.c ldfile.h
+ * ldgram.y ldinfo.h ldlang.c ldlang.h ldlex.h ldlex.l ldmain.c
+ * ldmain.h ldmisc.c ldmisc.h ldsym.c ldsym.h ldversion.c
+ * ldversion.h ldwarn.h ldwrite.c ldwrite.h y.tab.h
+ *
+ * As of this round of changes, ld now builds on all hosts of (Intel960)
+ * interest and copy passes my copy test on big endian hosts again.
+ *
+ * Revision 1.5 1991/03/09 03:25:04 sac
+ * Added support for LONG, SHORT and BYTE keywords in scripts
+ *
+ * Revision 1.4 1991/03/06 02:27:15 sac
+ * Added LONG, SHORT and BYTE keywords
+ *
+ * Revision 1.3 1991/02/22 17:14:59 sac
+ * Added RCS keywords and copyrights
+ *
+*/
+
+/*
+ * Written by Steve Chamberlain
+ * steve@cygnus.com
+ *
+ * This module handles expression trees.
+ */
+
+
+#include "sysdep.h"
+#include "bfd.h"
+
+#include "ld.h"
+#include "ldmain.h"
+#include "ldmisc.h"
+#include "ldexp.h"
+#include "ldgram.tab.h"
+#include "ldsym.h"
+#include "ldlang.h"
+
+extern char *output_filename;
+extern unsigned int undefined_global_sym_count;
+extern unsigned int defined_global_sym_count;
+extern bfd *output_bfd;
+extern size_t largest_section;
+extern lang_statement_list_type file_chain;
+extern args_type command_line;
+extern ld_config_type config;
+
+extern lang_input_statement_type *script_file;
+extern unsigned int defined_global_sym_count;
+
+extern bfd_vma print_dot;
+
+
+static void
+exp_print_token(outfile, code)
+FILE *outfile;
+token_code_type code;
+{
+ static struct {
+ token_code_type code;
+ char *name;
+ } table[] =
+ {
+ INT, "int",
+ CHAR,"char",
+ NAME,"NAME",
+ PLUSEQ,"+=",
+ MINUSEQ,"-=",
+ MULTEQ,"*=",
+ DIVEQ,"/=",
+ LSHIFTEQ,"<<=",
+ RSHIFTEQ,">>=",
+ ANDEQ,"&=",
+ OREQ,"|=",
+ OROR,"||",
+ ANDAND,"&&",
+ EQ,"==",
+ NE,"!=",
+ LE,"<=",
+ GE,">=",
+ LSHIFT,"<<",
+ RSHIFT,">>=",
+ ALIGN_K,"ALIGN",
+ BLOCK,"BLOCK",
+ SECTIONS,"SECTIONS",
+ ALIGNMENT,"ALIGNMENT",
+ SIZEOF_HEADERS,"SIZEOF_HEADERS",
+ NEXT,"NEXT",
+ SIZEOF,"SIZEOF",
+ ADDR,"ADDR",
+ MEMORY,"MEMORY",
+ DSECT,"DSECT",
+ NOLOAD,"NOLOAD",
+ COPY,"COPY",
+ INFO,"INFO",
+ OVERLAY,"OVERLAY",
+ DEFINED,"DEFINED",
+ TARGET_K,"TARGET",
+ SEARCH_DIR,"SEARCH_DIR",
+ MAP,"MAP",
+ LONG,"LONG",
+ SHORT,"SHORT",
+ BYTE,"BYTE",
+ ENTRY,"ENTRY",
+ 0,(char *)NULL} ;
+
+
+
+ unsigned int idx;
+ for (idx = 0; table[idx].name != (char*)NULL; idx++) {
+ if (table[idx].code == code) {
+ fprintf(outfile, "%s", table[idx].name);
+ return;
+ }
+ }
+ /* Not in table, just print it alone */
+ fprintf(outfile, "%c",code);
+}
+
+static void
+make_abs(ptr)
+etree_value_type *ptr;
+{
+ if (ptr->section != (lang_output_section_statement_type *)NULL) {
+ asection *s = ptr->section->bfd_section;
+ ptr->value += s->vma;
+ ptr->section = (lang_output_section_statement_type *)NULL;
+ }
+
+}
+static
+etree_value_type new_abs(value)
+bfd_vma value;
+{
+ etree_value_type new;
+ new.valid = true;
+ new.section = (lang_output_section_statement_type *)NULL;
+ new.value = value;
+ return new;
+}
+
+static void check(os)
+lang_output_section_statement_type *os;
+{
+ if (os == (lang_output_section_statement_type *)NULL) {
+ info("%F%P undefined section");
+ }
+ if (os->processed == false) {
+ info("%F%P forward reference of section");
+ }
+}
+
+etree_type *exp_intop(value)
+bfd_vma value;
+{
+ etree_type *new = (etree_type *)ldmalloc(sizeof(new->value));
+ new->type.node_code = INT;
+ new->value.value = value;
+ new->type.node_class = etree_value;
+ return new;
+
+}
+
+
+static
+etree_value_type new_rel(value, section)
+bfd_vma value;
+lang_output_section_statement_type *section;
+{
+ etree_value_type new;
+ new.valid = true;
+ new.value = value;
+ new.section = section;
+ return new;
+}
+
+static
+etree_value_type new_rel_from_section(value, section)
+bfd_vma value;
+lang_output_section_statement_type *section;
+{
+ etree_value_type new;
+ new.valid = true;
+ new.value = value;
+ new.section = section;
+ if (new.section != (lang_output_section_statement_type *)NULL) {
+ new.value -= section->bfd_section->vma;
+ }
+ return new;
+}
+
+static etree_value_type
+fold_binary(tree, current_section, allocation_done, dot, dotp)
+etree_type *tree;
+lang_output_section_statement_type *current_section;
+lang_phase_type allocation_done;
+bfd_vma dot;
+bfd_vma *dotp;
+{
+ etree_value_type result;
+
+ result = exp_fold_tree(tree->binary.lhs, current_section,
+ allocation_done, dot, dotp);
+ if (result.valid) {
+ etree_value_type other;
+ other = exp_fold_tree(tree->binary.rhs,
+ current_section,
+ allocation_done, dot,dotp) ;
+ if (other.valid) {
+ /* If values are from different sections, or this is an */
+ /* absolute expression, make both source args absolute */
+ if (result.section != other.section ||
+ current_section == (lang_output_section_statement_type *)NULL) {
+
+ make_abs(&result);
+ make_abs(&other);
+ }
+
+ switch (tree->type.node_code)
+ {
+ case '%':
+ /* Mod, both absolule*/
+
+ if (other.value == 0) {
+ info("%F%S % by zero\n");
+ }
+ result.value %= other.value;
+ break;
+ case '/':
+ if (other.value == 0) {
+ info("%F%S / by zero\n");
+ }
+ result.value /= other.value;
+ break;
+#define BOP(x,y) case x : result.value = result.value y other.value;break;
+ BOP('+',+);
+ BOP('*',*);
+ BOP('-',-);
+ BOP(LSHIFT,<<);
+ BOP(RSHIFT,>>);
+ BOP(EQ,==);
+ BOP(NE,!=);
+ BOP('<',<);
+ BOP('>',>);
+ BOP(LE,<=);
+ BOP(GE,>=);
+ BOP('&',&);
+ BOP('^',^);
+ BOP('|',|);
+ BOP(ANDAND,&&);
+ BOP(OROR,||);
+ default:
+ FAIL();
+ }
+ }
+ }
+ return result;
+}
+etree_value_type invalid()
+{
+ etree_value_type new;
+ new.valid = false;
+ return new;
+}
+
+etree_value_type fold_name(tree, current_section, allocation_done, dot)
+etree_type *tree;
+lang_output_section_statement_type *current_section;
+lang_phase_type allocation_done;
+bfd_vma dot;
+
+{
+ etree_value_type result;
+ switch (tree->type.node_code)
+ {
+ case DEFINED:
+ result.value =
+ ldsym_get_soft(tree->name.name) != (ldsym_type *)NULL;
+ result.section = 0;
+ result.valid = true;
+ break;
+ case NAME:
+ result.valid = false;
+ if (tree->name.name[0] == '.' && tree->name.name[1] == 0) {
+
+ if (allocation_done != lang_first_phase_enum) {
+ result = new_rel_from_section(dot, current_section);
+ }
+ else {
+ result = invalid();
+ }
+ }
+ else {
+ if (allocation_done == lang_final_phase_enum) {
+ ldsym_type *sy = ldsym_get_soft(tree->name.name);
+
+ if (sy) {
+ asymbol **sdefp = sy->sdefs_chain;
+
+ if (sdefp) {
+ asymbol *sdef = *sdefp;
+ if (sdef->section == (asection *)NULL) {
+ /* This is an absolute symbol */
+ result = new_abs(sdef->value);
+ }
+ else {
+ lang_output_section_statement_type *os =
+ lang_output_section_statement_lookup( sdef->section->output_section->name);
+ result = new_rel(sdef->value, os);
+ }
+ }
+ }
+ if (result.valid == false) {
+ info("%F%S: undefined symbol `%s' referenced in expression.\n",
+ tree->name.name);
+ }
+
+ }
+ }
+
+ break;
+
+ case ADDR:
+
+ if (allocation_done != lang_first_phase_enum) {
+ lang_output_section_statement_type *os =
+ lang_output_section_find(tree->name.name);
+ check(os);
+ result = new_rel((bfd_vma)0, os);
+ }
+ else {
+ result = invalid();
+ }
+ break;
+ case SIZEOF:
+ if(allocation_done != lang_first_phase_enum) {
+ lang_output_section_statement_type *os =
+ lang_output_section_find(tree->name.name);
+ check(os);
+ result = new_abs((bfd_vma)(os->bfd_section->size));
+ }
+ else {
+ result = invalid();
+ }
+ break;
+
+ default:
+ FAIL();
+ break;
+ }
+
+ return result;
+}
+etree_value_type exp_fold_tree(tree, current_section, allocation_done,
+ dot, dotp)
+etree_type *tree;
+lang_output_section_statement_type *current_section;
+lang_phase_type allocation_done;
+bfd_vma dot;
+bfd_vma *dotp;
+{
+ etree_value_type result;
+
+ if (tree == (etree_type *)NULL) {
+ result.valid = false;
+ }
+ else {
+ switch (tree->type.node_class)
+ {
+ case etree_value:
+ result = new_rel(tree->value.value, current_section);
+ break;
+ case etree_unary:
+ result = exp_fold_tree(tree->unary.child,
+ current_section,
+ allocation_done, dot, dotp);
+ if (result.valid == true)
+ {
+ switch(tree->type.node_code)
+ {
+ case ALIGN_K:
+ if (allocation_done != lang_first_phase_enum) {
+ result = new_rel_from_section(ALIGN(dot,
+ result.value) ,
+ current_section);
+
+ }
+ else {
+ result.valid = false;
+ }
+ break;
+ case '-':
+ result.value = -result.value;
+ break;
+ case NEXT:
+ result.valid = false;
+ break;
+ default:
+ FAIL();
+ }
+ }
+
+ break;
+ case etree_trinary:
+
+ result = exp_fold_tree(tree->trinary.cond,
+ current_section,
+ allocation_done, dot, dotp);
+ if (result.valid) {
+ result = exp_fold_tree(result.value ?
+ tree->trinary.lhs:tree->trinary.rhs,
+ current_section,
+ allocation_done, dot, dotp);
+ }
+
+ break;
+ case etree_binary:
+ result = fold_binary(tree, current_section, allocation_done,
+ dot, dotp);
+ break;
+ case etree_assign:
+ if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) {
+ /* Assignment to dot can only be done during allocation */
+ if (allocation_done == lang_allocating_phase_enum) {
+ result = exp_fold_tree(tree->assign.src,
+ current_section,
+ lang_allocating_phase_enum, dot, dotp);
+ if (result.valid == false) {
+ info("%F%S invalid assignment to location counter\n");
+ }
+ else {
+ if (current_section ==
+ (lang_output_section_statement_type *)NULL) {
+ info("%F%S assignment to location counter invalid outside of SECTION\n");
+ }
+ else {
+ unsigned long nextdot =result.value +
+ current_section->bfd_section->vma;
+ if (nextdot < dot) {
+ info("%F%S cannot move location counter backwards");
+ }
+ else {
+ *dotp = nextdot;
+ }
+ }
+ }
+ }
+ }
+ else {
+ ldsym_type *sy = ldsym_get(tree->assign.dst);
+
+ /* If this symbol has just been created then we'll place it into
+ * a section of our choice
+ */
+ result = exp_fold_tree(tree->assign.src,
+ current_section, allocation_done,
+ dot, dotp);
+ if (result.valid)
+ {
+ asymbol *def;
+ asymbol **def_ptr = (asymbol **)ldmalloc(sizeof(asymbol **));
+ /* Add this definition to script file */
+ def = (asymbol *)bfd_make_empty_symbol(script_file->the_bfd);
+ *def_ptr = def;
+
+
+ def->value = result.value;
+ if (result.section !=
+ (lang_output_section_statement_type *)NULL) {
+ if (current_section !=
+ (lang_output_section_statement_type *)NULL) {
+
+ def->section = result.section->bfd_section;
+ def->flags = BSF_GLOBAL | BSF_EXPORT;
+ }
+ else {
+ /* Force to absolute */
+ def->value += result.section->bfd_section->vma;
+ def->section = (asection *)NULL;
+ def->flags = BSF_GLOBAL | BSF_EXPORT | BSF_ABSOLUTE;
+ }
+
+
+ }
+ else {
+ def->section = (asection *)NULL;
+ def->flags = BSF_GLOBAL | BSF_EXPORT | BSF_ABSOLUTE;
+ }
+
+
+ def->udata = (void *)NULL;
+ def->name = sy->name;
+ Q_enter_global_ref(def_ptr);
+ }
+
+ }
+
+
+ break;
+ case etree_name:
+ result = fold_name(tree, current_section, allocation_done, dot);
+ break;
+ default:
+ info("%F%S Need more of these %d",tree->type.node_class );
+
+ }
+ }
+
+ return result;
+}
+
+
+etree_value_type exp_fold_tree_no_dot(tree, current_section, allocation_done)
+etree_type *tree;
+lang_output_section_statement_type *current_section;
+lang_phase_type allocation_done;
+{
+return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma)
+ 0, (bfd_vma *)NULL);
+}
+
+etree_type *
+exp_binop(code, lhs, rhs)
+int code;
+etree_type *lhs;
+etree_type *rhs;
+{
+ etree_type value, *new;
+ etree_value_type r;
+
+ value.type.node_code = code;
+ value.binary.lhs = lhs;
+ value.binary.rhs = rhs;
+ value.type.node_class = etree_binary;
+ r = exp_fold_tree_no_dot(&value, (lang_output_section_statement_type *)NULL,
+ lang_first_phase_enum );
+ if (r.valid)
+ {
+ return exp_intop(r.value);
+ }
+ new = (etree_type *)ldmalloc(sizeof(new->binary));
+ memcpy((char *)new, (char *)&value, sizeof(new->binary));
+ return new;
+}
+
+etree_type *
+exp_trinop(code, cond, lhs, rhs)
+int code;
+etree_type *cond;
+etree_type *lhs;
+etree_type *rhs;
+{
+ etree_type value, *new;
+ etree_value_type r;
+ value.type.node_code = code;
+ value.trinary.lhs = lhs;
+ value.trinary.cond = cond;
+ value.trinary.rhs = rhs;
+ value.type.node_class = etree_trinary;
+ r= exp_fold_tree_no_dot(&value, (lang_output_section_statement_type
+ *)NULL,lang_first_phase_enum);
+ if (r.valid) {
+ return exp_intop(r.value);
+ }
+ new = (etree_type *)ldmalloc(sizeof(new->trinary));
+ memcpy((char *)new,(char *) &value, sizeof(new->trinary));
+ return new;
+}
+
+
+etree_type *
+exp_unop(code, child)
+int code;
+etree_type *child;
+{
+ etree_type value, *new;
+
+ etree_value_type r;
+ value.unary.type.node_code = code;
+ value.unary.child = child;
+ value.unary.type.node_class = etree_unary;
+r = exp_fold_tree_no_dot(&value,(lang_output_section_statement_type *)NULL,
+ lang_first_phase_enum);
+if (r.valid) {
+ return exp_intop(r.value);
+ }
+ new = (etree_type *)ldmalloc(sizeof(new->unary));
+ memcpy((char *)new, (char *)&value, sizeof(new->unary));
+ return new;
+}
+
+
+etree_type *
+exp_nameop(code, name)
+int code;
+char *name;
+{
+
+ etree_type value, *new;
+
+ etree_value_type r;
+ value.name.type.node_code = code;
+ value.name.name = name;
+ value.name.type.node_class = etree_name;
+
+
+ r = exp_fold_tree_no_dot(&value,(lang_output_section_statement_type *)NULL,
+ lang_first_phase_enum);
+ if (r.valid) {
+ return exp_intop(r.value);
+ }
+ new = (etree_type *)ldmalloc(sizeof(new->name));
+ memcpy((char *)new, (char *)&value, sizeof(new->name));
+ return new;
+
+}
+
+
+
+
+etree_type *
+exp_assop(code, dst, src)
+int code;
+char *dst;
+etree_type *src;
+{
+ etree_type value, *new;
+
+ value.assign.type.node_code = code;
+
+
+ value.assign.src = src;
+ value.assign.dst = dst;
+ value.assign.type.node_class = etree_assign;
+
+#if 0
+ if (exp_fold_tree_no_dot(&value, &result)) {
+ return exp_intop(result);
+ }
+#endif
+ new = (etree_type*)ldmalloc(sizeof(new->assign));
+ memcpy((char *)new, (char *)&value, sizeof(new->assign));
+ return new;
+}
+
+void
+exp_print_tree(outfile, tree)
+FILE *outfile;
+etree_type *tree;
+{
+ switch (tree->type.node_class) {
+ case etree_value:
+ fprintf(outfile,"0x%08lx",(bfd_vma)(tree->value.value));
+ return;
+ case etree_assign:
+#if 0
+ if (tree->assign.dst->sdefs != (asymbol *)NULL){
+ fprintf(outfile,"%s (%x) ",tree->assign.dst->name,
+ tree->assign.dst->sdefs->value);
+ }
+ else {
+ fprintf(outfile,"%s (UNDEFINED)",tree->assign.dst->name);
+ }
+#endif
+ fprintf(outfile,"%s ",tree->assign.dst);
+ exp_print_token(outfile,tree->type.node_code);
+ exp_print_tree(outfile,tree->assign.src);
+ break;
+ case etree_binary:
+ exp_print_tree(outfile,tree->binary.lhs);
+ exp_print_token(outfile,tree->type.node_code);
+ exp_print_tree(outfile,tree->binary.rhs);
+ break;
+ case etree_trinary:
+ exp_print_tree(outfile,tree->trinary.cond);
+ fprintf(outfile,"?");
+ exp_print_tree(outfile,tree->trinary.lhs);
+ fprintf(outfile,":");
+ exp_print_tree(outfile,tree->trinary.rhs);
+ break;
+ case etree_unary:
+ exp_print_token(outfile,tree->unary.type.node_code);
+ fprintf(outfile,"(");
+ exp_print_tree(outfile,tree->unary.child);
+ fprintf(outfile,")");
+ break;
+ case etree_undef:
+ fprintf(outfile,"????????");
+ break;
+ case etree_name:
+ if (tree->type.node_code == NAME) {
+ fprintf(outfile,"%s", tree->name.name);
+ }
+ else {
+ exp_print_token(outfile,tree->type.node_code);
+ fprintf(outfile,"(%s)", tree->name.name);
+ }
+ break;
+ default:
+ FAIL();
+ break;
+ }
+}
+
+
+
+
+bfd_vma
+exp_get_vma(tree, def, name, allocation_done)
+etree_type *tree;
+bfd_vma def;
+char *name;
+lang_phase_type allocation_done;
+{
+ etree_value_type r;
+
+ if (tree != (etree_type *)NULL) {
+ r = exp_fold_tree_no_dot(tree,
+ (lang_output_section_statement_type *)NULL,
+ allocation_done);
+ if (r.valid == false && name) {
+ info("%F%S Nonconstant expression for %s\n",name);
+ }
+ return r.value;
+ }
+ else {
+ return def;
+ }
+}
+
+int
+exp_get_value_int(tree,def,name, allocation_done)
+etree_type *tree;
+int def;
+char *name;
+lang_phase_type allocation_done;
+{
+ return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done);
+}