/* This module handles expression trees.
-Copyright (C) 1991 Free Software Foundation, Inc.
+Copyright (C) 1991, 1993 Free Software Foundation, Inc.
Written by Steve Chamberlain of Cygnus Support (sac@cygnus.com).
This file is part of GLD, the Gnu Linker.
#include "bfd.h"
#include "sysdep.h"
+#include "bfdlink.h"
#include "ld.h"
-#include "ldsym.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldgram.h"
#include "ldlang.h"
+static void exp_print_token PARAMS ((token_code_type code));
+static void make_abs PARAMS ((etree_value_type *ptr));
+static etree_value_type new_abs PARAMS ((bfd_vma value));
+static void check PARAMS ((lang_output_section_statement_type *os,
+ const char *name, const char *op));
+static etree_value_type new_rel
+ PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
+static etree_value_type new_rel_from_section
+ PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
+static etree_value_type fold_binary
+ PARAMS ((etree_type *tree,
+ lang_output_section_statement_type *current_section,
+ lang_phase_type allocation_done,
+ bfd_vma dot, bfd_vma *dotp));
+static etree_value_type fold_name
+ PARAMS ((etree_type *tree,
+ lang_output_section_statement_type *current_section,
+ lang_phase_type allocation_done,
+ bfd_vma dot));
+static etree_value_type exp_fold_tree_no_dot
+ PARAMS ((etree_type *tree,
+ lang_output_section_statement_type *current_section,
+ lang_phase_type allocation_done));
+
static void
exp_print_token (code)
token_code_type code;
{
- static CONST struct {
- token_code_type code;
- char *name;
- } table[] =
+ static CONST struct
+ {
+ token_code_type code;
+ char *name;
+ } table[] =
{
- INT, "int",
- 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",
- SIZEOF_HEADERS,"SIZEOF_HEADERS",
- NEXT,"NEXT",
- SIZEOF,"SIZEOF",
- ADDR,"ADDR",
- MEMORY,"MEMORY",
-
-
-
-
-
- DEFINED,"DEFINED",
- TARGET_K,"TARGET",
- SEARCH_DIR,"SEARCH_DIR",
- MAP,"MAP",
- LONG,"LONG",
- SHORT,"SHORT",
- BYTE,"BYTE",
- ENTRY,"ENTRY",
- 0,(char *)NULL} ;
-
-
-
+ { INT, "int" },
+ { REL, "relocateable" },
+ { 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" },
+ { SIZEOF_HEADERS,"SIZEOF_HEADERS" },
+ { NEXT,"NEXT" },
+ { SIZEOF,"SIZEOF" },
+ { ADDR,"ADDR" },
+ { MEMORY,"MEMORY" },
+ { DEFINED,"DEFINED" },
+ { TARGET_K,"TARGET" },
+ { SEARCH_DIR,"SEARCH_DIR" },
+ { MAP,"MAP" },
+ { QUAD,"QUAD" },
+ { 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(config.map_file, "%s", table[idx].name);
}
+/* Build an expression representing an unnamed relocateable value. */
+
+etree_type *
+exp_relop (section, value)
+ asection *section;
+ bfd_vma value;
+{
+ etree_type *new = (etree_type *) stat_alloc (sizeof (new->rel));
+ new->type.node_code = REL;
+ new->type.node_class = etree_rel;
+ new->rel.section = section;
+ new->rel.value = value;
+ return new;
+}
static etree_value_type
new_rel (value, section)
return new;
}
-etree_value_type
+static etree_value_type
fold_name (tree, current_section, allocation_done, dot)
etree_type *tree;
lang_output_section_statement_type *current_section;
{
case SIZEOF_HEADERS:
if (allocation_done != lang_first_phase_enum)
- {
- result = new_abs(bfd_sizeof_headers(output_bfd,
- config.relocateable_output));
-
- }
- else {
- result.valid = false;
- }
+ {
+ result = new_abs ((bfd_vma)
+ bfd_sizeof_headers (output_bfd,
+ link_info.relocateable));
+ }
+ else
+ {
+ result.valid = false;
+ }
break;
case DEFINED:
- result.value =
- ldsym_get_soft(tree->name.name) != (ldsym_type *)NULL;
- result.section = 0;
- result.valid = true;
+ {
+ struct bfd_link_hash_entry *h;
+
+ h = bfd_link_hash_lookup (link_info.hash, tree->name.name,
+ false, false, true);
+ result.value = (h != (struct bfd_link_hash_entry *) NULL
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_common));
+ 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();
+ 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 0
- if (sdef->section == (asection *)NULL) {
- /* This is an absolute symbol */
- result = new_abs(sdef->value);
- }
- else
-#endif
- {
- lang_output_section_statement_type *os =
- lang_output_section_statement_lookup(
- sdef->section->output_section->name);
- /* If the symbol is from a file which we are not
- relocating (-R) then return an absolute for its
- value */
- if (bfd_asymbol_bfd(sdef)->usrdata &&
- ((lang_input_statement_type*)(bfd_asymbol_bfd(sdef)->usrdata))->just_syms_flag == true)
- {
- result = new_abs(sdef->value +sdef->section->vma);
-
- }
- else {
- result = new_rel(sdef->value + sdef->section->output_offset, os);
- }
- }
+ else if (allocation_done == lang_final_phase_enum)
+ {
+ struct bfd_link_hash_entry *h;
+
+ h = bfd_link_hash_lookup (link_info.hash, tree->name.name,
+ false, false, true);
+ if (h != (struct bfd_link_hash_entry *) NULL
+ && h->type == bfd_link_hash_defined)
+ {
+ lang_output_section_statement_type *os;
+
+ os = (lang_output_section_statement_lookup
+ (h->u.def.section->output_section->name));
+
+ /* FIXME: Is this correct if this section is being
+ linked with -R? */
+ result = new_rel ((h->u.def.value
+ + h->u.def.section->output_offset),
+ os);
}
- }
- if (result.valid == false) {
+ if (result.valid == false)
einfo("%F%S: undefined symbol `%s' referenced in expression\n",
- tree->name.name);
- }
-
+ tree->name.name);
}
- }
-
break;
case ADDR:
case etree_value:
result = new_rel(tree->value.value, current_section);
break;
+ case etree_rel:
+ if (allocation_done != lang_final_phase_enum)
+ result.valid = false;
+ else
+ result = new_rel ((tree->rel.value
+ + tree->rel.section->output_section->vma
+ + tree->rel.section->output_offset),
+ current_section);
+ break;
case etree_unary:
result = exp_fold_tree(tree->unary.child,
current_section,
dot, dotp);
break;
case etree_assign:
+ case etree_provide:
if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) {
/* Assignment to dot can only be done during allocation */
+ if (tree->type.node_class == etree_provide)
+ einfo ("%F%S can not PROVIDE assignment to location counter\n");
if (allocation_done == lang_allocating_phase_enum) {
result = exp_fold_tree(tree->assign.src,
current_section,
}
}
}
- 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)
+ else
{
- asymbol *def;
- asymbol **def_ptr ;
- /* Add this definition to script file */
- if (sy->sdefs_chain)
- {
- def_ptr = sy->sdefs_chain;
- def = *def_ptr;
-
- }
- else
- {
- def_ptr = (asymbol **)stat_alloc((bfd_size_type)(sizeof(asymbol **)));
- def = (asymbol *)bfd_make_empty_symbol(script_file->the_bfd);
-
-
- def->flags = 0;
-
- sy->sdefs_chain = def_ptr;
- *def_ptr = def;
- }
-
- def->value = result.value;
-
- def->section = result.section->bfd_section;
- def->flags |= BSF_GLOBAL | BSF_EXPORT;
-
-
- def->udata = (PTR)NULL;
- def->name = sy->name;
-
- if (sy->sdefs_chain == 0)
- enter_global_ref(def_ptr, sy->name);
- }
-
- }
-
-
+ result = exp_fold_tree (tree->assign.src,
+ current_section, allocation_done,
+ dot, dotp);
+ if (result.valid)
+ {
+ struct bfd_link_hash_entry *h;
+
+ h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
+ (tree->type.node_class == etree_assign
+ ? true : false),
+ false, false);
+ if (h == (struct bfd_link_hash_entry *) NULL)
+ {
+ if (tree->type.node_class == etree_assign)
+ einfo ("%P%F:%s: hash creation failed\n",
+ tree->assign.dst);
+ }
+ else if (tree->type.node_class == etree_provide
+ && h->type != bfd_link_hash_undefined
+ && h->type != bfd_link_hash_common)
+ {
+ /* Do nothing. The symbol was defined by some
+ object. */
+ }
+ else
+ {
+ /* FIXME: Should we worry if the symbol is already
+ defined? */
+ h->type = bfd_link_hash_defined;
+ h->u.def.value = result.value;
+ h->u.def.section = result.section->bfd_section;
+ }
+ }
+ }
break;
case etree_name:
result = fold_name(tree, current_section, allocation_done, dot);
}
-etree_value_type
+static etree_value_type
exp_fold_tree_no_dot (tree, current_section, allocation_done)
etree_type *tree;
lang_output_section_statement_type *current_section;
return new;
}
+/* Handle PROVIDE. */
+
+etree_type *
+exp_provide (dst, src)
+ const char *dst;
+ etree_type *src;
+{
+ etree_type *n;
+
+ n = (etree_type *) stat_alloc (sizeof (n->assign));
+ n->assign.type.node_code = '=';
+ n->assign.type.node_class = etree_provide;
+ n->assign.src = src;
+ n->assign.dst = dst;
+ return n;
+}
+
void
exp_print_tree (tree)
etree_type *tree;
case etree_value:
print_address(tree->value.value);
return;
-
+ case etree_rel:
+ if (tree->rel.section->owner != NULL)
+ fprintf (config.map_file, "%s:",
+ bfd_get_filename (tree->rel.section->owner));
+ fprintf (config.map_file, "%s+", tree->rel.section->name);
+ print_address (tree->rel.value);
+ return;
case etree_assign:
#if 0
if (tree->assign.dst->sdefs != (asymbol *)NULL){
exp_print_token(tree->type.node_code);
exp_print_tree(tree->assign.src);
break;
+ case etree_provide:
+ fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
+ exp_print_tree (tree->assign.src);
+ fprintf (config.map_file, ")");
+ break;
case etree_binary:
fprintf(config.map_file,"(");
exp_print_tree(tree->binary.lhs);
# (e.g., .PARISC.milli)
# OTHER_READWRITE_SECTIONS - other than .data .bss .sdata ...
# (e.g., .PARISC.global)
+# OTHER_SECTIONS - at the end
# EXECUTABLE_SYMBOLS - symbols that must be defined for an
# executable (e.g., _DYNAMIC_LINK)
# TEXT_START_SYMBOLS - symbols that appear at the start of the
# When adding sections, do note that the names of some sections are used
# when specifying the start address of the next.
#
+INTERP=".interp ${RELOCATING-0} : { *(.interp) }"
PLT=".plt ${RELOCATING-0} : { *(.plt) }"
cat <<EOF
OUTPUT_FORMAT("${OUTPUT_FORMAT}")
SECTIONS
{
/* Read-only sections, merged into text segment: */
- ${RELOCATING+. = ${TEXT_START_ADDR} + SIZEOF_HEADERS;}
- .interp ${RELOCATING-0} : { *(.interp) }
+ ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_START_ADDR} + SIZEOF_HEADERS;}}
+ ${CREATE_SHLIB+${RELOCATING+. = SIZEOF_HEADERS;}}
+ ${CREATE_SHLIB-${INTERP}}
.hash ${RELOCATING-0} : { *(.hash) }
.dynsym ${RELOCATING-0} : { *(.dynsym) }
.dynstr ${RELOCATING-0} : { *(.dynstr) }
*(.text)
}
${RELOCATING+_etext = .;}
+ ${RELOCATING+PROVIDE (etext = .);}
.fini ${RELOCATING-0} : { *(.fini) } =${NOP-0}
.ctors ${RELOCATING-0} : { *(.ctors) }
.dtors ${RELOCATING-0} : { *(.dtors) }
we can shorten the on-disk segment size. */
.sdata ${RELOCATING-0} : { *(.sdata) }
${RELOCATING+_edata = .;}
+ ${RELOCATING+PROVIDE (edata = .);}
${RELOCATING+__bss_start = .;}
${RELOCATING+${OTHER_BSS_SYMBOLS}}
.sbss ${RELOCATING-0} : { *(.sbss) *(.scommon) }
*(COMMON)
}
${RELOCATING+_end = . ;}
- ${RELOCATING+end = . ;}
+ ${RELOCATING+PROVIDE (end = .);}
+
+ /* These are needed for ELF backends which have not yet been
+ converted to the new style linker. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+
+ /* These must appear regardless of ${RELOCATING}. */
+ ${OTHER_SECTIONS}
}
EOF
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