/* This module handles expression trees.
-Copyright (C) 1991 Free Software Foundation, Inc.
-Written by Steve Chamberlain of Cygnus Support (sac@cygnus.com).
+ Copyright (C) 1991-2020 Free Software Foundation, Inc.
+ Written by Steve Chamberlain of Cygnus Support <sac@cygnus.com>.
-This file is part of GLD, the Gnu Linker.
+ This file is part of the GNU Binutils.
-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 2, or (at your option)
-any later version.
+ This program 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 3 of the License, 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.
+ This program 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. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-/*
-This module is in charge of working out the contents of expressions.
-It has to keep track of the relative/absness of a symbol etc. This is
-done by keeping all values in a struct (an etree_value_type) which
-contains a value, a section to which it is relative and a valid bit.
+/* This module is in charge of working out the contents of expressions.
-*/
+ It has to keep track of the relative/absness of a symbol etc. This
+ is done by keeping all values in a struct (an etree_value_type)
+ which contains a value, a section to which it is relative and a
+ valid bit. */
-
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
+#include "bfdlink.h"
+#include "ctf-api.h"
#include "ld.h"
-#include "ldsym.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
-#include "ldgram.h"
+#include "ldlex.h"
+#include <ldgram.h>
#include "ldlang.h"
+#include "libiberty.h"
+#include "safe-ctype.h"
+
+static void exp_fold_tree_1 (etree_type *);
+static bfd_vma align_n (bfd_vma, bfd_vma);
+
+segment_type *segments;
+
+struct ldexp_control expld;
+
+/* This structure records symbols for which we need to keep track of
+ definedness for use in the DEFINED () test. It is also used in
+ making absolute symbols section relative late in the link. */
+
+struct definedness_hash_entry
+{
+ struct bfd_hash_entry root;
+
+ /* If this symbol was assigned from "dot" outside of an output
+ section statement, the section we'd like it relative to. */
+ asection *final_sec;
+
+ /* Low bits of iteration count. Symbols with matching iteration have
+ been defined in this pass over the script. */
+ unsigned int iteration : 8;
+
+ /* Symbol was defined by an object file. */
+ unsigned int by_object : 1;
+};
+
+static struct bfd_hash_table definedness_table;
+
+/* Print the string representation of the given token. Surround it
+ with spaces if INFIX_P is TRUE. */
static void
-exp_print_token (code)
- token_code_type code;
+exp_print_token (token_code_type code, int infix_p)
{
- static CONST struct {
+ 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} ;
+ const char *name;
+ }
+ table[] =
+ {
+ { INT, "int" },
+ { NAME, "NAME" },
+ { PLUSEQ, "+=" },
+ { MINUSEQ, "-=" },
+ { MULTEQ, "*=" },
+ { DIVEQ, "/=" },
+ { LSHIFTEQ, "<<=" },
+ { RSHIFTEQ, ">>=" },
+ { ANDEQ, "&=" },
+ { OREQ, "|=" },
+ { OROR, "||" },
+ { ANDAND, "&&" },
+ { EQ, "==" },
+ { NE, "!=" },
+ { LE, "<=" },
+ { GE, ">=" },
+ { LSHIFT, "<<" },
+ { RSHIFT, ">>" },
+ { LOG2CEIL, "LOG2CEIL" },
+ { ALIGN_K, "ALIGN" },
+ { BLOCK, "BLOCK" },
+ { QUAD, "QUAD" },
+ { SQUAD, "SQUAD" },
+ { LONG, "LONG" },
+ { SHORT, "SHORT" },
+ { BYTE, "BYTE" },
+ { SECTIONS, "SECTIONS" },
+ { SIZEOF_HEADERS, "SIZEOF_HEADERS" },
+ { MEMORY, "MEMORY" },
+ { DEFINED, "DEFINED" },
+ { TARGET_K, "TARGET" },
+ { SEARCH_DIR, "SEARCH_DIR" },
+ { MAP, "MAP" },
+ { ENTRY, "ENTRY" },
+ { NEXT, "NEXT" },
+ { ALIGNOF, "ALIGNOF" },
+ { SIZEOF, "SIZEOF" },
+ { ADDR, "ADDR" },
+ { LOADADDR, "LOADADDR" },
+ { CONSTANT, "CONSTANT" },
+ { ABSOLUTE, "ABSOLUTE" },
+ { MAX_K, "MAX" },
+ { MIN_K, "MIN" },
+ { ASSERT_K, "ASSERT" },
+ { REL, "relocatable" },
+ { DATA_SEGMENT_ALIGN, "DATA_SEGMENT_ALIGN" },
+ { DATA_SEGMENT_RELRO_END, "DATA_SEGMENT_RELRO_END" },
+ { DATA_SEGMENT_END, "DATA_SEGMENT_END" },
+ { ORIGIN, "ORIGIN" },
+ { LENGTH, "LENGTH" },
+ { SEGMENT_START, "SEGMENT_START" }
+ };
+ unsigned int idx;
+ for (idx = 0; idx < ARRAY_SIZE (table); idx++)
+ if (table[idx].code == code)
+ break;
+ if (infix_p)
+ fputc (' ', config.map_file);
- 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);
- return;
+ if (idx < ARRAY_SIZE (table))
+ fputs (table[idx].name, config.map_file);
+ else if (code < 127)
+ fputc (code, config.map_file);
+ else
+ fprintf (config.map_file, "<code %d>", code);
+
+ if (infix_p)
+ fputc (' ', config.map_file);
+}
+
+static void
+make_log2ceil (void)
+{
+ bfd_vma value = expld.result.value;
+ bfd_vma result = -1;
+ bfd_boolean round_up = FALSE;
+
+ do
+ {
+ result++;
+ /* If more than one bit is set in the value we will need to round up. */
+ if ((value > 1) && (value & 1))
+ round_up = TRUE;
}
- }
- /* Not in table, just print it alone */
- fprintf(config.map_file, "%c",code);
+ while (value >>= 1);
+
+ if (round_up)
+ result += 1;
+ expld.result.section = NULL;
+ expld.result.value = result;
}
-static void
-make_abs (ptr)
- etree_value_type *ptr;
+static void
+make_abs (void)
{
- asection *s = ptr->section->bfd_section;
- ptr->value += s->vma;
- ptr->section = abs_output_section;
+ if (expld.result.section != NULL)
+ expld.result.value += expld.result.section->vma;
+ expld.result.section = bfd_abs_section_ptr;
+ expld.rel_from_abs = FALSE;
}
-static etree_value_type
-new_abs (value)
- bfd_vma value;
+static void
+new_abs (bfd_vma value)
{
- etree_value_type new;
- new.valid = true;
- new.section = abs_output_section;
- new.value = value;
- return new;
+ expld.result.valid_p = TRUE;
+ expld.result.section = bfd_abs_section_ptr;
+ expld.result.value = value;
+ expld.result.str = NULL;
}
-static void
-check (os, name, op)
- lang_output_section_statement_type *os;
- CONST char *name;
- CONST char *op;
+etree_type *
+exp_intop (bfd_vma value)
{
- if (os == (lang_output_section_statement_type *)NULL) {
- einfo("%F%P: %s uses undefined section %s\n", op, name);
- }
- if (os->processed == false) {
- einfo("%F%P: %s forward reference of section %s\n",op, name);
- }
+ etree_type *new_e = stat_alloc (sizeof (new_e->value));
+ new_e->type.node_code = INT;
+ new_e->type.filename = ldlex_filename ();
+ new_e->type.lineno = lineno;
+ new_e->value.value = value;
+ new_e->value.str = NULL;
+ new_e->type.node_class = etree_value;
+ return new_e;
+}
+
+etree_type *
+exp_bigintop (bfd_vma value, char *str)
+{
+ etree_type *new_e = stat_alloc (sizeof (new_e->value));
+ new_e->type.node_code = INT;
+ new_e->type.filename = ldlex_filename ();
+ new_e->type.lineno = lineno;
+ new_e->value.value = value;
+ new_e->value.str = str;
+ new_e->type.node_class = etree_value;
+ return new_e;
}
+/* Build an expression representing an unnamed relocatable value. */
+
etree_type *
-exp_intop (value)
- bfd_vma value;
+exp_relop (asection *section, bfd_vma value)
{
- etree_type *new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->value)));
- new->type.node_code = INT;
- new->value.value = value;
- new->type.node_class = etree_value;
- return new;
+ etree_type *new_e = stat_alloc (sizeof (new_e->rel));
+ new_e->type.node_code = REL;
+ new_e->type.filename = ldlex_filename ();
+ new_e->type.lineno = lineno;
+ new_e->type.node_class = etree_rel;
+ new_e->rel.section = section;
+ new_e->rel.value = value;
+ return new_e;
+}
+static void
+new_number (bfd_vma value)
+{
+ expld.result.valid_p = TRUE;
+ expld.result.value = value;
+ expld.result.str = NULL;
+ expld.result.section = NULL;
}
+static void
+new_rel (bfd_vma value, asection *section)
+{
+ expld.result.valid_p = TRUE;
+ expld.result.value = value;
+ expld.result.str = NULL;
+ expld.result.section = section;
+}
-static etree_value_type
-new_rel (value, section)
- bfd_vma value;
- lang_output_section_statement_type *section;
+static void
+new_rel_from_abs (bfd_vma value)
{
- etree_value_type new;
- new.valid = true;
- new.value = value;
- new.section = section;
- return new;
+ asection *s = expld.section;
+
+ expld.rel_from_abs = TRUE;
+ expld.result.valid_p = TRUE;
+ expld.result.value = value - s->vma;
+ expld.result.str = NULL;
+ expld.result.section = s;
}
-static etree_value_type
-new_rel_from_section (value, section)
- bfd_vma value;
- lang_output_section_statement_type *section;
+/* New-function for the definedness hash table. */
+
+static struct bfd_hash_entry *
+definedness_newfunc (struct bfd_hash_entry *entry,
+ struct bfd_hash_table *table ATTRIBUTE_UNUSED,
+ const char *name ATTRIBUTE_UNUSED)
{
- etree_value_type new;
- new.valid = true;
- new.value = value;
- new.section = section;
+ struct definedness_hash_entry *ret = (struct definedness_hash_entry *) entry;
+
+ if (ret == NULL)
+ ret = (struct definedness_hash_entry *)
+ bfd_hash_allocate (table, sizeof (struct definedness_hash_entry));
- new.value -= section->bfd_section->vma;
+ if (ret == NULL)
+ einfo (_("%F%P: bfd_hash_allocate failed creating symbol %s\n"), name);
- return new;
+ ret->by_object = 0;
+ ret->iteration = 0;
+ return &ret->root;
}
-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;
+/* Called during processing of linker script script expressions.
+ For symbols assigned in a linker script, return a struct describing
+ where the symbol is defined relative to the current expression,
+ otherwise return NULL. */
+
+static struct definedness_hash_entry *
+symbol_defined (const char *name)
{
- etree_value_type result;
+ return ((struct definedness_hash_entry *)
+ bfd_hash_lookup (&definedness_table, name, FALSE, FALSE));
+}
- 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 == abs_output_section)
- {
- make_abs(&result);
- make_abs(&other);
- }
-
- switch (tree->type.node_code)
+/* Update the definedness state of NAME. Return FALSE if script symbol
+ is multiply defining a strong symbol in an object. */
+
+static bfd_boolean
+update_definedness (const char *name, struct bfd_link_hash_entry *h)
+{
+ bfd_boolean ret;
+ struct definedness_hash_entry *defentry
+ = (struct definedness_hash_entry *)
+ bfd_hash_lookup (&definedness_table, name, TRUE, FALSE);
+
+ if (defentry == NULL)
+ einfo (_("%F%P: bfd_hash_lookup failed creating symbol %s\n"), name);
+
+ /* If the symbol was already defined, and not by a script, then it
+ must be defined by an object file or by the linker target code. */
+ ret = TRUE;
+ if (!h->ldscript_def
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak
+ || h->type == bfd_link_hash_common))
+ {
+ defentry->by_object = 1;
+ if (h->type == bfd_link_hash_defined
+ && h->u.def.section->output_section != NULL
+ && !h->linker_def)
+ ret = FALSE;
+ }
+
+ defentry->iteration = lang_statement_iteration;
+ defentry->final_sec = bfd_abs_section_ptr;
+ if (expld.phase == lang_final_phase_enum
+ && expld.rel_from_abs
+ && expld.result.section == bfd_abs_section_ptr)
+ defentry->final_sec = section_for_dot ();
+ return ret;
+}
+
+static void
+fold_segment_end (seg_align_type *seg)
+{
+ if (expld.phase == lang_first_phase_enum
+ || expld.section != bfd_abs_section_ptr)
+ {
+ expld.result.valid_p = FALSE;
+ }
+ else if (seg->phase == exp_seg_align_seen
+ || seg->phase == exp_seg_relro_seen)
+ {
+ seg->phase = exp_seg_end_seen;
+ seg->end = expld.result.value;
+ }
+ else if (seg->phase == exp_seg_done
+ || seg->phase == exp_seg_adjust
+ || seg->phase == exp_seg_relro_adjust)
+ {
+ /* OK. */
+ }
+ else
+ expld.result.valid_p = FALSE;
+}
+
+static void
+fold_unary (etree_type *tree)
+{
+ exp_fold_tree_1 (tree->unary.child);
+ if (expld.result.valid_p)
+ {
+ switch (tree->type.node_code)
{
- case '%':
- /* Mod, both absolule*/
+ case ALIGN_K:
+ if (expld.phase != lang_first_phase_enum)
+ new_rel_from_abs (align_n (expld.dot, expld.result.value));
+ else
+ expld.result.valid_p = FALSE;
+ break;
- if (other.value == 0) {
- einfo("%F%S %% by zero\n");
- }
- result.value = (int)result.value % (int)other.value;
+ case ABSOLUTE:
+ make_abs ();
break;
- case '/':
- if (other.value == 0) {
- einfo("%F%S / by zero\n");
- }
- result.value = (int)result.value / (int) other.value;
+
+ case LOG2CEIL:
+ make_log2ceil ();
+ break;
+
+ case '~':
+ expld.result.value = ~expld.result.value;
+ break;
+
+ case '!':
+ expld.result.value = !expld.result.value;
+ break;
+
+ case '-':
+ expld.result.value = -expld.result.value;
+ break;
+
+ case NEXT:
+ /* Return next place aligned to value. */
+ if (expld.phase != lang_first_phase_enum)
+ {
+ make_abs ();
+ expld.result.value = align_n (expld.dot, expld.result.value);
+ }
+ else
+ expld.result.valid_p = FALSE;
+ break;
+
+ case DATA_SEGMENT_END:
+ fold_segment_end (&expld.dataseg);
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();
+ FAIL ();
+ break;
}
}
- else {
- result.valid = false;
- }
- }
- return result;
}
-etree_value_type
-invalid ()
+
+/* Arithmetic operators, bitwise AND, bitwise OR and XOR keep the
+ section of one of their operands only when the other operand is a
+ plain number. Losing the section when operating on two symbols,
+ ie. a result of a plain number, is required for subtraction and
+ XOR. It's justifiable for the other operations on the grounds that
+ adding, multiplying etc. two section relative values does not
+ really make sense unless they are just treated as numbers.
+ The same argument could be made for many expressions involving one
+ symbol and a number. For example, "1 << x" and "100 / x" probably
+ should not be given the section of x. The trouble is that if we
+ fuss about such things the rules become complex and it is onerous
+ to document ld expression evaluation. */
+static void
+arith_result_section (const etree_value_type *lhs)
{
- etree_value_type new;
- new.valid = false;
- return new;
+ if (expld.result.section == lhs->section)
+ {
+ if (expld.section == bfd_abs_section_ptr
+ && !config.sane_expr)
+ /* Duplicate the insanity in exp_fold_tree_1 case etree_value. */
+ expld.result.section = bfd_abs_section_ptr;
+ else
+ expld.result.section = NULL;
+ }
}
-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;
+static void
+fold_segment_align (seg_align_type *seg, etree_value_type *lhs)
{
- etree_value_type result;
- switch (tree->type.node_code)
- {
- case SIZEOF_HEADERS:
- if (allocation_done != lang_first_phase_enum)
- {
- result = new_abs(bfd_sizeof_headers(output_bfd,
- config.relocateable_output));
+ seg->relro = exp_seg_relro_start;
+ if (expld.phase == lang_first_phase_enum
+ || expld.section != bfd_abs_section_ptr)
+ expld.result.valid_p = FALSE;
+ else
+ {
+ bfd_vma maxpage = lhs->value;
+ bfd_vma commonpage = expld.result.value;
- }
- else {
- result.valid = false;
- }
- break;
- 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();
- }
+ expld.result.value = align_n (expld.dot, maxpage);
+ if (seg->phase == exp_seg_relro_adjust)
+ expld.result.value = seg->base;
+ else if (seg->phase == exp_seg_adjust)
+ {
+ if (commonpage < maxpage)
+ expld.result.value += ((expld.dot + commonpage - 1)
+ & (maxpage - commonpage));
}
- 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
+ {
+ expld.result.value += expld.dot & (maxpage - 1);
+ if (seg->phase == exp_seg_done)
+ {
+ /* OK. */
}
- if (result.valid == false) {
- einfo("%F%S: undefined symbol `%s' referenced in expression\n",
- tree->name.name);
+ else if (seg->phase == exp_seg_none)
+ {
+ seg->phase = exp_seg_align_seen;
+ seg->base = expld.result.value;
+ seg->pagesize = commonpage;
+ seg->maxpagesize = maxpage;
+ seg->relro_end = 0;
}
-
- }
+ else
+ expld.result.valid_p = FALSE;
}
+ }
+}
- break;
-
- case ADDR:
+static void
+fold_segment_relro_end (seg_align_type *seg, etree_value_type *lhs)
+{
+ /* Operands swapped! XXX_SEGMENT_RELRO_END(offset,exp) has offset
+ in expld.result and exp in lhs. */
+ seg->relro = exp_seg_relro_end;
+ seg->relro_offset = expld.result.value;
+ if (expld.phase == lang_first_phase_enum
+ || expld.section != bfd_abs_section_ptr)
+ expld.result.valid_p = FALSE;
+ else if (seg->phase == exp_seg_align_seen
+ || seg->phase == exp_seg_adjust
+ || seg->phase == exp_seg_relro_adjust
+ || seg->phase == exp_seg_done)
+ {
+ if (seg->phase == exp_seg_align_seen
+ || seg->phase == exp_seg_relro_adjust)
+ seg->relro_end = lhs->value + expld.result.value;
- if (allocation_done != lang_first_phase_enum) {
- lang_output_section_statement_type *os =
- lang_output_section_find(tree->name.name);
- check(os,tree->name.name,"ADDR");
- 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,tree->name.name,"SIZEOF");
- result = new_abs((bfd_vma)(os->bfd_section->_raw_size));
- }
- else {
- result = invalid();
+ if (seg->phase == exp_seg_relro_adjust
+ && (seg->relro_end & (seg->pagesize - 1)))
+ {
+ seg->relro_end += seg->pagesize - 1;
+ seg->relro_end &= ~(seg->pagesize - 1);
+ expld.result.value = seg->relro_end - expld.result.value;
}
- break;
-
- default:
- FAIL();
- break;
- }
+ else
+ expld.result.value = lhs->value;
- return result;
+ if (seg->phase == exp_seg_align_seen)
+ seg->phase = exp_seg_relro_seen;
+ }
+ else
+ expld.result.valid_p = FALSE;
}
-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;
+
+static void
+fold_binary (etree_type *tree)
{
- etree_value_type result;
+ etree_value_type lhs;
+ exp_fold_tree_1 (tree->binary.lhs);
+
+ /* The SEGMENT_START operator is special because its first
+ operand is a string, not the name of a symbol. Note that the
+ operands have been swapped, so binary.lhs is second (default)
+ operand, binary.rhs is first operand. */
+ if (expld.result.valid_p && tree->type.node_code == SEGMENT_START)
+ {
+ bfd_vma value = expld.result.value;
+ const char *segment_name;
+ segment_type *seg;
+
+ /* Check to see if the user has overridden the default
+ value. */
+ segment_name = tree->binary.rhs->name.name;
+ for (seg = segments; seg; seg = seg->next)
+ if (strcmp (seg->name, segment_name) == 0)
+ {
+ if (!seg->used
+ && config.magic_demand_paged
+ && config.maxpagesize != 0
+ && (seg->value % config.maxpagesize) != 0)
+ einfo (_("%P: warning: address of `%s' "
+ "isn't multiple of maximum page size\n"),
+ segment_name);
+ seg->used = TRUE;
+ value = seg->value;
+ break;
+ }
+ new_rel_from_abs (value);
+ return;
+ }
- if (tree == (etree_type *)NULL) {
- result.valid = false;
- }
- else {
- switch (tree->type.node_class)
+ lhs = expld.result;
+ exp_fold_tree_1 (tree->binary.rhs);
+ expld.result.valid_p &= lhs.valid_p;
+
+ if (expld.result.valid_p)
{
- 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)
+ if (lhs.section != expld.result.section)
{
- case ALIGN_K:
- if (allocation_done != lang_first_phase_enum) {
- result = new_rel_from_section(ALIGN_N(dot,
- result.value) ,
- current_section);
-
- }
- else {
- result.valid = false;
- }
- break;
- case ABSOLUTE:
- if (allocation_done != lang_first_phase_enum)
- {
- if (current_section
- == (lang_output_section_statement_type*)NULL)
+ /* If the values are from different sections, and neither is
+ just a number, make both the source arguments absolute. */
+ if (expld.result.section != NULL
+ && lhs.section != NULL)
{
- /* Outside a section, so it's all ok */
-
+ make_abs ();
+ lhs.value += lhs.section->vma;
+ lhs.section = bfd_abs_section_ptr;
}
- else {
- /* Inside a section, subtract the base of the section,
- so when it's added again (in an assignment), everything comes out fine
- */
- result.section = abs_output_section;
- result.value -= current_section->bfd_section->vma;
- result.valid = true;
+
+ /* If the rhs is just a number, keep the lhs section. */
+ else if (expld.result.section == NULL)
+ {
+ expld.result.section = lhs.section;
+ /* Make this NULL so that we know one of the operands
+ was just a number, for later tests. */
+ lhs.section = NULL;
}
- }
- else
- {
- result.valid = false;
- }
+ }
+ /* At this point we know that both operands have the same
+ section, or at least one of them is a plain number. */
+ switch (tree->type.node_code)
+ {
+#define BOP(x, y) \
+ case x: \
+ expld.result.value = lhs.value y expld.result.value; \
+ arith_result_section (&lhs); \
break;
- case '~':
- make_abs(&result);
- result.value = ~result.value;
+
+ /* Comparison operators, logical AND, and logical OR always
+ return a plain number. */
+#define BOPN(x, y) \
+ case x: \
+ expld.result.value = lhs.value y expld.result.value; \
+ expld.result.section = NULL; \
break;
- case '!':
- make_abs(&result);
- result.value = !result.value;
+
+ BOP ('+', +);
+ BOP ('*', *);
+ BOP ('-', -);
+ BOP (LSHIFT, <<);
+ BOP (RSHIFT, >>);
+ BOP ('&', &);
+ BOP ('^', ^);
+ BOP ('|', |);
+ BOPN (EQ, ==);
+ BOPN (NE, !=);
+ BOPN ('<', <);
+ BOPN ('>', >);
+ BOPN (LE, <=);
+ BOPN (GE, >=);
+ BOPN (ANDAND, &&);
+ BOPN (OROR, ||);
+
+ case '%':
+ if (expld.result.value != 0)
+ expld.result.value = ((bfd_signed_vma) lhs.value
+ % (bfd_signed_vma) expld.result.value);
+ else if (expld.phase != lang_mark_phase_enum)
+ einfo (_("%F%P:%pS %% by zero\n"), tree->binary.rhs);
+ arith_result_section (&lhs);
break;
- case '-':
- make_abs(&result);
- result.value = -result.value;
+
+ case '/':
+ if (expld.result.value != 0)
+ expld.result.value = ((bfd_signed_vma) lhs.value
+ / (bfd_signed_vma) expld.result.value);
+ else if (expld.phase != lang_mark_phase_enum)
+ einfo (_("%F%P:%pS / by zero\n"), tree->binary.rhs);
+ arith_result_section (&lhs);
break;
- case NEXT:
- if (allocation_done ==lang_allocating_phase_enum) {
- make_abs(&result);
- result.value = ALIGN_N(dot, result.value);
- }
- else {
- /* Return next place aligned to value */
- result.valid = false;
- }
+
+ case MAX_K:
+ if (lhs.value > expld.result.value)
+ expld.result.value = lhs.value;
+ break;
+
+ case MIN_K:
+ if (lhs.value < expld.result.value)
+ expld.result.value = lhs.value;
+ break;
+
+ case ALIGN_K:
+ expld.result.value = align_n (lhs.value, expld.result.value);
+ break;
+
+ case DATA_SEGMENT_ALIGN:
+ fold_segment_align (&expld.dataseg, &lhs);
+ break;
+
+ case DATA_SEGMENT_RELRO_END:
+ fold_segment_relro_end (&expld.dataseg, &lhs);
break;
- default:
- FAIL();
+
+ 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);
- }
+static void
+fold_trinary (etree_type *tree)
+{
+ struct bfd_link_hash_entry *save = expld.assign_src;
+
+ exp_fold_tree_1 (tree->trinary.cond);
+ expld.assign_src = save;
+ if (expld.result.valid_p)
+ exp_fold_tree_1 (expld.result.value
+ ? tree->trinary.lhs
+ : tree->trinary.rhs);
+}
+
+static void
+fold_name (etree_type *tree)
+{
+ struct bfd_link_hash_entry *h;
+ struct definedness_hash_entry *def;
+ memset (&expld.result, 0, sizeof (expld.result));
+
+ switch (tree->type.node_code)
+ {
+ case SIZEOF_HEADERS:
+ link_info.load_phdrs = 1;
+ if (expld.phase != lang_first_phase_enum)
+ {
+ bfd_vma hdr_size = 0;
+ /* Don't find the real header size if only marking sections;
+ The bfd function may cache incorrect data. */
+ if (expld.phase != lang_mark_phase_enum)
+ hdr_size = bfd_sizeof_headers (link_info.output_bfd, &link_info);
+ new_number (hdr_size);
+ }
break;
- case etree_binary:
- result = fold_binary(tree, current_section, allocation_done,
- dot, dotp);
+
+ case DEFINED:
+ h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
+ &link_info,
+ tree->name.name,
+ FALSE, FALSE, TRUE);
+ new_number (h != NULL
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak
+ || h->type == bfd_link_hash_common)
+ && (!h->ldscript_def
+ || (def = symbol_defined (tree->name.name)) == NULL
+ || def->by_object
+ || def->iteration == (lang_statement_iteration & 255)));
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) {
- einfo("%F%S invalid assignment to location counter\n");
- }
- else {
- if (current_section ==
- (lang_output_section_statement_type *)NULL) {
- einfo("%F%S assignment to location counter invalid outside of SECTION\n");
+
+ case NAME:
+ if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
+ new_rel_from_abs (expld.dot);
+ else
+ {
+ h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
+ &link_info,
+ tree->name.name,
+ TRUE, FALSE, TRUE);
+ if (!h)
+ einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
+ else if (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak)
+ {
+ asection *output_section;
+
+ output_section = h->u.def.section->output_section;
+ if (output_section == NULL)
+ {
+ if (expld.phase <= lang_mark_phase_enum)
+ new_rel (h->u.def.value, h->u.def.section);
+ else
+ einfo (_("%X%P:%pS: unresolvable symbol `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ }
+ else if (output_section == bfd_abs_section_ptr
+ && (expld.section != bfd_abs_section_ptr
+ || config.sane_expr))
+ new_number (h->u.def.value + h->u.def.section->output_offset);
+ else
+ new_rel (h->u.def.value + h->u.def.section->output_offset,
+ output_section);
}
- else {
- bfd_vma nextdot =result.value +
- current_section->bfd_section->vma;
- if (nextdot < dot) {
- einfo("%F%S cannot move location counter backwards (from %V to %V)\n", dot, nextdot);
- }
- else {
- *dotp = nextdot;
- }
+ else if (expld.phase == lang_final_phase_enum
+ || (expld.phase != lang_mark_phase_enum
+ && expld.assigning_to_dot))
+ einfo (_("%F%P:%pS: undefined symbol `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ else if (h->type == bfd_link_hash_new)
+ {
+ h->type = bfd_link_hash_undefined;
+ h->u.undef.abfd = NULL;
+ if (h->u.undef.next == NULL && h != link_info.hash->undefs_tail)
+ bfd_link_add_undef (link_info.hash, h);
}
- }
+ if (expld.assign_src == NULL)
+ expld.assign_src = h;
+ else
+ expld.assign_src = (struct bfd_link_hash_entry *) - 1;
+
+ /* Self-assignment is only allowed for absolute symbols
+ defined in a linker script. */
+ if (expld.assign_name != NULL
+ && strcmp (expld.assign_name, tree->name.name) == 0
+ && !(h != NULL
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak)
+ && h->u.def.section == bfd_abs_section_ptr
+ && (def = symbol_defined (tree->name.name)) != NULL
+ && def->iteration == (lang_statement_iteration & 255)))
+ expld.assign_name = NULL;
}
- }
- 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)
+ break;
+
+ case ADDR:
+ if (expld.phase != lang_first_phase_enum)
{
- 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;
- }
+ lang_output_section_statement_type *os;
+
+ os = lang_output_section_find (tree->name.name);
+ if (os == NULL)
+ {
+ if (expld.phase == lang_final_phase_enum)
+ einfo (_("%F%P:%pS: undefined section `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ }
+ else if (os->processed_vma)
+ new_rel (0, os->bfd_section);
+ }
+ break;
+
+ case LOADADDR:
+ if (expld.phase != lang_first_phase_enum)
+ {
+ lang_output_section_statement_type *os;
- def->value = result.value;
+ os = lang_output_section_find (tree->name.name);
+ if (os == NULL)
+ {
+ if (expld.phase == lang_final_phase_enum)
+ einfo (_("%F%P:%pS: undefined section `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ }
+ else if (os->processed_lma)
+ {
+ if (os->load_base == NULL)
+ new_abs (os->bfd_section->lma);
+ else
+ {
+ exp_fold_tree_1 (os->load_base);
+ if (expld.result.valid_p)
+ make_abs ();
+ }
+ }
+ }
+ break;
- def->section = result.section->bfd_section;
- def->flags |= BSF_GLOBAL | BSF_EXPORT;
+ case SIZEOF:
+ case ALIGNOF:
+ if (expld.phase != lang_first_phase_enum)
+ {
+ lang_output_section_statement_type *os;
+ os = lang_output_section_find (tree->name.name);
+ if (os == NULL)
+ {
+ if (expld.phase == lang_final_phase_enum)
+ einfo (_("%F%P:%pS: undefined section `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ new_number (0);
+ }
+ else if (os->bfd_section != NULL)
+ {
+ bfd_vma val;
- def->udata = (PTR)NULL;
- def->name = sy->name;
+ if (tree->type.node_code == SIZEOF)
+ val = (os->bfd_section->size
+ / bfd_octets_per_byte (link_info.output_bfd,
+ os->bfd_section));
+ else
+ val = (bfd_vma)1 << os->bfd_section->alignment_power;
- if (sy->sdefs_chain == 0)
- enter_global_ref(def_ptr, sy->name);
+ new_number (val);
+ }
+ else
+ new_number (0);
}
+ break;
+ case LENGTH:
+ {
+ lang_memory_region_type *mem;
+
+ mem = lang_memory_region_lookup (tree->name.name, FALSE);
+ if (mem != NULL)
+ new_number (mem->length);
+ else
+ einfo (_("%F%P:%pS: undefined MEMORY region `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
}
+ break;
-
+ case ORIGIN:
+ {
+ lang_memory_region_type *mem;
+
+ mem = lang_memory_region_lookup (tree->name.name, FALSE);
+ if (mem != NULL)
+ new_rel_from_abs (mem->origin);
+ else
+ einfo (_("%F%P:%pS: undefined MEMORY region `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ }
break;
- case etree_name:
- result = fold_name(tree, current_section, allocation_done, dot);
+
+ case CONSTANT:
+ if (strcmp (tree->name.name, "MAXPAGESIZE") == 0)
+ new_number (config.maxpagesize);
+ else if (strcmp (tree->name.name, "COMMONPAGESIZE") == 0)
+ new_number (config.commonpagesize);
+ else
+ einfo (_("%F%P:%pS: unknown constant `%s' referenced in expression\n"),
+ tree, tree->name.name);
break;
- default:
- einfo("%F%S need more of these %d\n",tree->type.node_class );
+ default:
+ FAIL ();
+ break;
}
- }
+}
+
+/* Return true if TREE is '.'. */
- return result;
+static bfd_boolean
+is_dot (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_name
+ && tree->type.node_code == NAME
+ && tree->name.name[0] == '.'
+ && tree->name.name[1] == 0);
}
+/* Return true if TREE is a constant equal to VAL. */
-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;
+static bfd_boolean
+is_value (const etree_type *tree, bfd_vma val)
{
-return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma)
- 0, (bfd_vma *)NULL);
+ return (tree->type.node_class == etree_value
+ && tree->value.value == val);
}
-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,
- abs_output_section,
- lang_first_phase_enum );
- if (r.valid)
+/* Return true if TREE is an absolute symbol equal to VAL defined in
+ a linker script. */
+
+static bfd_boolean
+is_sym_value (const etree_type *tree, bfd_vma val)
+{
+ struct bfd_link_hash_entry *h;
+ struct definedness_hash_entry *def;
+
+ return (tree->type.node_class == etree_name
+ && tree->type.node_code == NAME
+ && (def = symbol_defined (tree->name.name)) != NULL
+ && def->iteration == (lang_statement_iteration & 255)
+ && (h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
+ &link_info,
+ tree->name.name,
+ FALSE, FALSE, TRUE)) != NULL
+ && h->ldscript_def
+ && h->type == bfd_link_hash_defined
+ && h->u.def.section == bfd_abs_section_ptr
+ && h->u.def.value == val);
+}
+
+/* Return true if TREE is ". != 0". */
+
+static bfd_boolean
+is_dot_ne_0 (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_binary
+ && tree->type.node_code == NE
+ && is_dot (tree->binary.lhs)
+ && is_value (tree->binary.rhs, 0));
+}
+
+/* Return true if TREE is ". = . + 0" or ". = . + sym" where sym is an
+ absolute constant with value 0 defined in a linker script. */
+
+static bfd_boolean
+is_dot_plus_0 (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_binary
+ && tree->type.node_code == '+'
+ && is_dot (tree->binary.lhs)
+ && (is_value (tree->binary.rhs, 0)
+ || is_sym_value (tree->binary.rhs, 0)));
+}
+
+/* Return true if TREE is "ALIGN (. != 0 ? some_expression : 1)". */
+
+static bfd_boolean
+is_align_conditional (const etree_type *tree)
+{
+ if (tree->type.node_class == etree_unary
+ && tree->type.node_code == ALIGN_K)
+ {
+ tree = tree->unary.child;
+ return (tree->type.node_class == etree_trinary
+ && is_dot_ne_0 (tree->trinary.cond)
+ && is_value (tree->trinary.rhs, 1));
+ }
+ return FALSE;
+}
+
+static void
+exp_fold_tree_1 (etree_type *tree)
+{
+ if (tree == NULL)
+ {
+ memset (&expld.result, 0, sizeof (expld.result));
+ return;
+ }
+
+ switch (tree->type.node_class)
+ {
+ case etree_value:
+ if (expld.section == bfd_abs_section_ptr
+ && !config.sane_expr)
+ new_abs (tree->value.value);
+ else
+ new_number (tree->value.value);
+ expld.result.str = tree->value.str;
+ break;
+
+ case etree_rel:
+ if (expld.phase != lang_first_phase_enum)
+ {
+ asection *output_section = tree->rel.section->output_section;
+ new_rel (tree->rel.value + tree->rel.section->output_offset,
+ output_section);
+ }
+ else
+ memset (&expld.result, 0, sizeof (expld.result));
+ break;
+
+ case etree_assert:
+ exp_fold_tree_1 (tree->assert_s.child);
+ if (expld.phase == lang_final_phase_enum && !expld.result.value)
+ einfo ("%X%P: %s\n", tree->assert_s.message);
+ break;
+
+ case etree_unary:
+ fold_unary (tree);
+ break;
+
+ case etree_binary:
+ fold_binary (tree);
+ break;
+
+ case etree_trinary:
+ fold_trinary (tree);
+ break;
+
+ case etree_assign:
+ case etree_provide:
+ case etree_provided:
+ if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0)
+ {
+ if (tree->type.node_class != etree_assign)
+ einfo (_("%F%P:%pS can not PROVIDE assignment to"
+ " location counter\n"), tree);
+ if (expld.phase != lang_first_phase_enum)
+ {
+ /* Notify the folder that this is an assignment to dot. */
+ expld.assigning_to_dot = TRUE;
+ exp_fold_tree_1 (tree->assign.src);
+ expld.assigning_to_dot = FALSE;
+
+ /* If we are assigning to dot inside an output section
+ arrange to keep the section, except for certain
+ expressions that evaluate to zero. We ignore . = 0,
+ . = . + 0, and . = ALIGN (. != 0 ? expr : 1).
+ We can't ignore all expressions that evaluate to zero
+ because an otherwise empty section might have padding
+ added by an alignment expression that changes with
+ relaxation. Such a section might have zero size
+ before relaxation and so be stripped incorrectly. */
+ if (expld.phase == lang_mark_phase_enum
+ && expld.section != bfd_abs_section_ptr
+ && expld.section != bfd_und_section_ptr
+ && !(expld.result.valid_p
+ && expld.result.value == 0
+ && (is_value (tree->assign.src, 0)
+ || is_sym_value (tree->assign.src, 0)
+ || is_dot_plus_0 (tree->assign.src)
+ || is_align_conditional (tree->assign.src))))
+ expld.section->flags |= SEC_KEEP;
+
+ if (!expld.result.valid_p
+ || expld.section == bfd_und_section_ptr)
+ {
+ if (expld.phase != lang_mark_phase_enum)
+ einfo (_("%F%P:%pS invalid assignment to"
+ " location counter\n"), tree);
+ }
+ else if (expld.dotp == NULL)
+ einfo (_("%F%P:%pS assignment to location counter"
+ " invalid outside of SECTIONS\n"), tree);
+
+ /* After allocation, assignment to dot should not be
+ done inside an output section since allocation adds a
+ padding statement that effectively duplicates the
+ assignment. */
+ else if (expld.phase <= lang_allocating_phase_enum
+ || expld.section == bfd_abs_section_ptr)
+ {
+ bfd_vma nextdot;
+
+ nextdot = expld.result.value;
+ if (expld.result.section != NULL)
+ nextdot += expld.result.section->vma;
+ else
+ nextdot += expld.section->vma;
+ if (nextdot < expld.dot
+ && expld.section != bfd_abs_section_ptr)
+ einfo (_("%F%P:%pS cannot move location counter backwards"
+ " (from %V to %V)\n"),
+ tree, expld.dot, nextdot);
+ else
+ {
+ expld.dot = nextdot;
+ *expld.dotp = nextdot;
+ }
+ }
+ }
+ else
+ memset (&expld.result, 0, sizeof (expld.result));
+ }
+ else
+ {
+ struct bfd_link_hash_entry *h = NULL;
+
+ if (tree->type.node_class == etree_provide)
+ {
+ h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
+ FALSE, FALSE, TRUE);
+ if (h == NULL
+ || !(h->type == bfd_link_hash_new
+ || h->type == bfd_link_hash_undefined
+ || h->type == bfd_link_hash_undefweak
+ || h->linker_def))
+ {
+ /* Do nothing. The symbol was never referenced, or
+ was defined in some object file. Note that
+ undefweak symbols are defined by PROVIDE. This
+ is to support glibc use of __rela_iplt_start and
+ similar weak references. */
+ break;
+ }
+ }
+
+ expld.assign_name = tree->assign.dst;
+ expld.assign_src = NULL;
+ exp_fold_tree_1 (tree->assign.src);
+ /* expld.assign_name remaining equal to tree->assign.dst
+ below indicates the evaluation of tree->assign.src did
+ not use the value of tree->assign.dst. We don't allow
+ self assignment until the final phase for two reasons:
+ 1) Expressions are evaluated multiple times. With
+ relaxation, the number of times may vary.
+ 2) Section relative symbol values cannot be correctly
+ converted to absolute values, as is required by many
+ expressions, until final section sizing is complete. */
+ if (expld.phase == lang_final_phase_enum
+ || expld.phase == lang_fixed_phase_enum
+ || expld.assign_name != NULL)
+ {
+ if (tree->type.node_class == etree_provide)
+ tree->type.node_class = etree_provided;
+
+ if (h == NULL)
+ {
+ h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
+ TRUE, FALSE, TRUE);
+ if (h == NULL)
+ einfo (_("%F%P:%s: hash creation failed\n"),
+ tree->assign.dst);
+ }
+
+ /* If the expression is not valid then fake a zero value. In
+ the final phase any errors will already have been raised,
+ in earlier phases we want to create this definition so
+ that it can be seen by other expressions. */
+ if (!expld.result.valid_p
+ && h->type == bfd_link_hash_new)
+ {
+ expld.result.value = 0;
+ expld.result.section = NULL;
+ expld.result.valid_p = TRUE;
+ }
+
+ if (expld.result.valid_p)
+ {
+ if (expld.result.section == NULL)
+ expld.result.section = expld.section;
+ if (!update_definedness (tree->assign.dst, h) && 0)
+ {
+ /* Symbol was already defined. For now this error
+ is disabled because it causes failures in the ld
+ testsuite: ld-elf/var1, ld-scripts/defined5, and
+ ld-scripts/pr14962. Some of these no doubt
+ reflect scripts used in the wild. */
+ (*link_info.callbacks->multiple_definition)
+ (&link_info, h, link_info.output_bfd,
+ expld.result.section, expld.result.value);
+ }
+ if (expld.phase == lang_fixed_phase_enum)
+ {
+ if (h->type == bfd_link_hash_defined)
+ {
+ expld.result.value = h->u.def.value;
+ expld.result.section = h->u.def.section;
+ }
+ }
+ else
+ {
+ h->type = bfd_link_hash_defined;
+ h->u.def.value = expld.result.value;
+ h->u.def.section = expld.result.section;
+ h->linker_def = ! tree->assign.type.lineno;
+ h->ldscript_def = 1;
+ h->rel_from_abs = expld.rel_from_abs;
+ if (tree->assign.hidden)
+ bfd_link_hide_symbol (link_info.output_bfd,
+ &link_info, h);
+
+ /* Copy the symbol type if this is an expression only
+ referencing a single symbol. (If the expression
+ contains ternary conditions, ignoring symbols on
+ false branches.) */
+ if (expld.assign_src != NULL
+ && (expld.assign_src
+ != (struct bfd_link_hash_entry *) -1))
+ bfd_copy_link_hash_symbol_type (link_info.output_bfd,
+ h, expld.assign_src);
+ }
+ }
+ }
+ if (expld.phase != lang_fixed_phase_enum)
+ expld.assign_name = NULL;
+ }
+ break;
+
+ case etree_name:
+ fold_name (tree);
+ break;
+
+ default:
+ FAIL ();
+ memset (&expld.result, 0, sizeof (expld.result));
+ break;
+ }
+}
+
+void
+exp_fold_tree (etree_type *tree, asection *current_section, bfd_vma *dotp)
+{
+ expld.rel_from_abs = FALSE;
+ expld.dot = *dotp;
+ expld.dotp = dotp;
+ expld.section = current_section;
+ exp_fold_tree_1 (tree);
+}
+
+void
+exp_fold_tree_no_dot (etree_type *tree)
+{
+ expld.rel_from_abs = FALSE;
+ expld.dot = 0;
+ expld.dotp = NULL;
+ expld.section = bfd_abs_section_ptr;
+ exp_fold_tree_1 (tree);
+}
+
+static void
+exp_value_fold (etree_type *tree)
+{
+ exp_fold_tree_no_dot (tree);
+ if (expld.result.valid_p)
{
- return exp_intop(r.value);
+ tree->type.node_code = INT;
+ tree->value.value = expld.result.value;
+ tree->value.str = NULL;
+ tree->type.node_class = etree_value;
}
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->binary)));
- memcpy((char *)new, (char *)&value, sizeof(new->binary));
- return new;
}
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
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 *)stat_alloc((bfd_size_type)(sizeof(new->trinary)));
- memcpy((char *)new,(char *) &value, sizeof(new->trinary));
- return new;
+exp_binop (int code, etree_type *lhs, etree_type *rhs)
+{
+ etree_type *new_e = stat_alloc (MAX (sizeof (new_e->binary),
+ sizeof (new_e->value)));
+ new_e->type.node_code = code;
+ new_e->type.filename = lhs->type.filename;
+ new_e->type.lineno = lhs->type.lineno;
+ new_e->binary.lhs = lhs;
+ new_e->binary.rhs = rhs;
+ new_e->type.node_class = etree_binary;
+ if (lhs->type.node_class == etree_value
+ && rhs->type.node_class == etree_value
+ && code != ALIGN_K
+ && code != DATA_SEGMENT_ALIGN
+ && code != DATA_SEGMENT_RELRO_END)
+ exp_value_fold (new_e);
+ return new_e;
}
+etree_type *
+exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs)
+{
+ etree_type *new_e = stat_alloc (MAX (sizeof (new_e->trinary),
+ sizeof (new_e->value)));
+ new_e->type.node_code = code;
+ new_e->type.filename = cond->type.filename;
+ new_e->type.lineno = cond->type.lineno;
+ new_e->trinary.lhs = lhs;
+ new_e->trinary.cond = cond;
+ new_e->trinary.rhs = rhs;
+ new_e->type.node_class = etree_trinary;
+ if (cond->type.node_class == etree_value
+ && lhs->type.node_class == etree_value
+ && rhs->type.node_class == etree_value)
+ exp_value_fold (new_e);
+ return new_e;
+}
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,abs_output_section,
- lang_first_phase_enum);
- if (r.valid) {
- return exp_intop(r.value);
- }
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->unary)));
- memcpy((char *)new, (char *)&value, sizeof(new->unary));
- return new;
+exp_unop (int code, etree_type *child)
+{
+ etree_type *new_e = stat_alloc (MAX (sizeof (new_e->unary),
+ sizeof (new_e->value)));
+ new_e->unary.type.node_code = code;
+ new_e->unary.type.filename = child->type.filename;
+ new_e->unary.type.lineno = child->type.lineno;
+ new_e->unary.child = child;
+ new_e->unary.type.node_class = etree_unary;
+ if (child->type.node_class == etree_value
+ && code != ALIGN_K
+ && code != ABSOLUTE
+ && code != NEXT
+ && code != DATA_SEGMENT_END)
+ exp_value_fold (new_e);
+ return new_e;
}
+etree_type *
+exp_nameop (int code, const char *name)
+{
+ etree_type *new_e = stat_alloc (sizeof (new_e->name));
+
+ new_e->name.type.node_code = code;
+ new_e->name.type.filename = ldlex_filename ();
+ new_e->name.type.lineno = lineno;
+ new_e->name.name = name;
+ new_e->name.type.node_class = etree_name;
+ return new_e;
+
+}
+
+static etree_type *
+exp_assop (const char *dst,
+ etree_type *src,
+ enum node_tree_enum class,
+ bfd_boolean hidden)
+{
+ etree_type *n;
+
+ n = stat_alloc (sizeof (n->assign));
+ n->assign.type.node_code = '=';
+ n->assign.type.filename = src->type.filename;
+ n->assign.type.lineno = src->type.lineno;
+ n->assign.type.node_class = class;
+ n->assign.src = src;
+ n->assign.dst = dst;
+ n->assign.hidden = hidden;
+ return n;
+}
+
+/* Handle linker script assignments and HIDDEN. */
etree_type *
-exp_nameop (code, name)
- int code;
- CONST 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 *)stat_alloc((bfd_size_type)(sizeof(new->name)));
- memcpy((char *)new, (char *)&value, sizeof(new->name));
- return new;
+exp_assign (const char *dst, etree_type *src, bfd_boolean hidden)
+{
+ return exp_assop (dst, src, etree_assign, hidden);
+}
+
+/* Handle --defsym command-line option. */
+etree_type *
+exp_defsym (const char *dst, etree_type *src)
+{
+ return exp_assop (dst, src, etree_assign, FALSE);
}
+/* Handle PROVIDE. */
+etree_type *
+exp_provide (const char *dst, etree_type *src, bfd_boolean hidden)
+{
+ return exp_assop (dst, src, etree_provide, hidden);
+}
+/* Handle ASSERT. */
etree_type *
-exp_assop (code, dst, src)
- int code;
- CONST char *dst;
- etree_type *src;
+exp_assert (etree_type *exp, const char *message)
{
- etree_type value, *new;
+ etree_type *n;
+
+ n = stat_alloc (sizeof (n->assert_s));
+ n->assert_s.type.node_code = '!';
+ n->assert_s.type.filename = exp->type.filename;
+ n->assert_s.type.lineno = exp->type.lineno;
+ n->assert_s.type.node_class = etree_assert;
+ n->assert_s.child = exp;
+ n->assert_s.message = message;
+ return n;
+}
- value.assign.type.node_code = code;
+void
+exp_print_tree (etree_type *tree)
+{
+ bfd_boolean function_like;
+ if (config.map_file == NULL)
+ config.map_file = stderr;
- value.assign.src = src;
- value.assign.dst = dst;
- value.assign.type.node_class = etree_assign;
+ if (tree == NULL)
+ {
+ minfo ("NULL TREE\n");
+ return;
+ }
-#if 0
- if (exp_fold_tree_no_dot(&value, &result)) {
- return exp_intop(result);
- }
-#endif
- new = (etree_type*)stat_alloc((bfd_size_type)(sizeof(new->assign)));
- memcpy((char *)new, (char *)&value, sizeof(new->assign));
- return new;
-}
-
-void
-exp_print_tree (tree)
- etree_type *tree;
-{
- switch (tree->type.node_class) {
- case etree_value:
- print_address(tree->value.value);
- return;
-
- case etree_assign:
-#if 0
- if (tree->assign.dst->sdefs != (asymbol *)NULL){
- fprintf(config.map_file,"%s (%x) ",tree->assign.dst->name,
- tree->assign.dst->sdefs->value);
+ switch (tree->type.node_class)
+ {
+ case etree_value:
+ minfo ("0x%v", tree->value.value);
+ return;
+ case etree_rel:
+ if (tree->rel.section->owner != NULL)
+ minfo ("%pB:", tree->rel.section->owner);
+ minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value);
+ return;
+ case etree_assign:
+ fputs (tree->assign.dst, config.map_file);
+ exp_print_token (tree->type.node_code, TRUE);
+ exp_print_tree (tree->assign.src);
+ break;
+ case etree_provide:
+ case etree_provided:
+ fprintf (config.map_file, "PROVIDE (%s = ", tree->assign.dst);
+ exp_print_tree (tree->assign.src);
+ fputc (')', config.map_file);
+ break;
+ case etree_binary:
+ function_like = FALSE;
+ switch (tree->type.node_code)
+ {
+ case MAX_K:
+ case MIN_K:
+ case ALIGN_K:
+ case DATA_SEGMENT_ALIGN:
+ case DATA_SEGMENT_RELRO_END:
+ function_like = TRUE;
+ break;
+ case SEGMENT_START:
+ /* Special handling because arguments are in reverse order and
+ the segment name is quoted. */
+ exp_print_token (tree->type.node_code, FALSE);
+ fputs (" (\"", config.map_file);
+ exp_print_tree (tree->binary.rhs);
+ fputs ("\", ", config.map_file);
+ exp_print_tree (tree->binary.lhs);
+ fputc (')', config.map_file);
+ return;
+ }
+ if (function_like)
+ {
+ exp_print_token (tree->type.node_code, FALSE);
+ fputc (' ', config.map_file);
+ }
+ fputc ('(', config.map_file);
+ exp_print_tree (tree->binary.lhs);
+ if (function_like)
+ fprintf (config.map_file, ", ");
+ else
+ exp_print_token (tree->type.node_code, TRUE);
+ exp_print_tree (tree->binary.rhs);
+ fputc (')', config.map_file);
+ break;
+ case etree_trinary:
+ exp_print_tree (tree->trinary.cond);
+ fputc ('?', config.map_file);
+ exp_print_tree (tree->trinary.lhs);
+ fputc (':', config.map_file);
+ exp_print_tree (tree->trinary.rhs);
+ break;
+ case etree_unary:
+ exp_print_token (tree->unary.type.node_code, FALSE);
+ if (tree->unary.child)
+ {
+ fprintf (config.map_file, " (");
+ exp_print_tree (tree->unary.child);
+ fputc (')', config.map_file);
+ }
+ break;
+
+ case etree_assert:
+ fprintf (config.map_file, "ASSERT (");
+ exp_print_tree (tree->assert_s.child);
+ fprintf (config.map_file, ", %s)", tree->assert_s.message);
+ break;
+
+ case etree_name:
+ if (tree->type.node_code == NAME)
+ fputs (tree->name.name, config.map_file);
+ else
+ {
+ exp_print_token (tree->type.node_code, FALSE);
+ if (tree->name.name)
+ fprintf (config.map_file, " (%s)", tree->name.name);
+ }
+ break;
+ default:
+ FAIL ();
+ break;
}
- else {
- fprintf(config.map_file,"%s (UNDEFINED)",tree->assign.dst->name);
+}
+
+bfd_vma
+exp_get_vma (etree_type *tree, bfd_vma def, char *name)
+{
+ if (tree != NULL)
+ {
+ exp_fold_tree_no_dot (tree);
+ if (expld.result.valid_p)
+ return expld.result.value;
+ else if (name != NULL && expld.phase != lang_mark_phase_enum)
+ einfo (_("%F%P:%pS: nonconstant expression for %s\n"),
+ tree, name);
+ }
+ return def;
+}
+
+/* Return the smallest non-negative integer such that two raised to
+ that power is at least as large as the vma evaluated at TREE, if
+ TREE is a non-NULL expression that can be resolved. If TREE is
+ NULL or cannot be resolved, return -1. */
+
+int
+exp_get_power (etree_type *tree, char *name)
+{
+ bfd_vma x = exp_get_vma (tree, -1, name);
+ bfd_vma p2;
+ int n;
+
+ if (x == (bfd_vma) -1)
+ return -1;
+
+ for (n = 0, p2 = 1; p2 < x; ++n, p2 <<= 1)
+ if (p2 == 0)
+ break;
+
+ return n;
+}
+
+fill_type *
+exp_get_fill (etree_type *tree, fill_type *def, char *name)
+{
+ fill_type *fill;
+ size_t len;
+ unsigned int val;
+
+ if (tree == NULL)
+ return def;
+
+ exp_fold_tree_no_dot (tree);
+ if (!expld.result.valid_p)
+ {
+ if (name != NULL && expld.phase != lang_mark_phase_enum)
+ einfo (_("%F%P:%pS: nonconstant expression for %s\n"),
+ tree, name);
+ return def;
}
-#endif
- fprintf(config.map_file,"%s ",tree->assign.dst);
- exp_print_token(tree->type.node_code);
- exp_print_tree(tree->assign.src);
- break;
- case etree_binary:
- fprintf(config.map_file,"(");
- exp_print_tree(tree->binary.lhs);
- exp_print_token(tree->type.node_code);
- exp_print_tree(tree->binary.rhs);
- fprintf(config.map_file,")");
- break;
- case etree_trinary:
- exp_print_tree(tree->trinary.cond);
- fprintf(config.map_file,"?");
- exp_print_tree(tree->trinary.lhs);
- fprintf(config.map_file,":");
- exp_print_tree(tree->trinary.rhs);
- break;
- case etree_unary:
- exp_print_token(tree->unary.type.node_code);
- if (tree->unary.child)
+
+ if (expld.result.str != NULL && (len = strlen (expld.result.str)) != 0)
{
-
- fprintf(config.map_file,"(");
- exp_print_tree(tree->unary.child);
- fprintf(config.map_file,")");
- }
-
- break;
- case etree_undef:
- fprintf(config.map_file,"????????");
- break;
- case etree_name:
- if (tree->type.node_code == NAME) {
- fprintf(config.map_file,"%s", tree->name.name);
+ unsigned char *dst;
+ unsigned char *s;
+ fill = (fill_type *) xmalloc ((len + 1) / 2 + sizeof (*fill) - 1);
+ fill->size = (len + 1) / 2;
+ dst = fill->data;
+ s = (unsigned char *) expld.result.str;
+ val = 0;
+ do
+ {
+ unsigned int digit;
+
+ digit = *s++ - '0';
+ if (digit > 9)
+ digit = (digit - 'A' + '0' + 10) & 0xf;
+ val <<= 4;
+ val += digit;
+ --len;
+ if ((len & 1) == 0)
+ {
+ *dst++ = val;
+ val = 0;
+ }
+ }
+ while (len != 0);
}
- else {
- exp_print_token(tree->type.node_code);
- if (tree->name.name)
- fprintf(config.map_file,"(%s)", tree->name.name);
+ else
+ {
+ fill = (fill_type *) xmalloc (4 + sizeof (*fill) - 1);
+ val = expld.result.value;
+ fill->data[0] = (val >> 24) & 0xff;
+ fill->data[1] = (val >> 16) & 0xff;
+ fill->data[2] = (val >> 8) & 0xff;
+ fill->data[3] = (val >> 0) & 0xff;
+ fill->size = 4;
}
- break;
- default:
- FAIL();
- break;
- }
+ return fill;
}
+bfd_vma
+exp_get_abs_int (etree_type *tree, int def, char *name)
+{
+ if (tree != NULL)
+ {
+ exp_fold_tree_no_dot (tree);
+ if (expld.result.valid_p)
+ {
+ if (expld.result.section != NULL)
+ expld.result.value += expld.result.section->vma;
+ return expld.result.value;
+ }
+ else if (name != NULL && expld.phase != lang_mark_phase_enum)
+ {
+ einfo (_("%F%P:%pS: nonconstant expression for %s\n"),
+ tree, name);
+ }
+ }
+ return def;
+}
+static bfd_vma
+align_n (bfd_vma value, bfd_vma align)
+{
+ if (align <= 1)
+ return value;
-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,
- abs_output_section,
- allocation_done);
- if (r.valid == false && name) {
- einfo("%F%S nonconstant expression for %s\n",name);
+ value = (value + align - 1) / align;
+ return value * align;
+}
+
+void
+ldexp_init (void)
+{
+ /* The value "13" is ad-hoc, somewhat related to the expected number of
+ assignments in a linker script. */
+ if (!bfd_hash_table_init_n (&definedness_table,
+ definedness_newfunc,
+ sizeof (struct definedness_hash_entry),
+ 13))
+ einfo (_("%F%P: can not create hash table: %E\n"));
+}
+
+/* Convert absolute symbols defined by a script from "dot" (also
+ SEGMENT_START or ORIGIN) outside of an output section statement,
+ to section relative. */
+
+static bfd_boolean
+set_sym_sections (struct bfd_hash_entry *bh, void *inf ATTRIBUTE_UNUSED)
+{
+ struct definedness_hash_entry *def = (struct definedness_hash_entry *) bh;
+ if (def->final_sec != bfd_abs_section_ptr)
+ {
+ struct bfd_link_hash_entry *h;
+ h = bfd_link_hash_lookup (link_info.hash, bh->string,
+ FALSE, FALSE, TRUE);
+ if (h != NULL
+ && h->type == bfd_link_hash_defined
+ && h->u.def.section == bfd_abs_section_ptr)
+ {
+ h->u.def.value -= def->final_sec->vma;
+ h->u.def.section = def->final_sec;
+ }
}
- return r.value;
- }
- else {
- return def;
- }
+ return TRUE;
}
-int
-exp_get_value_int (tree,def,name, allocation_done)
- etree_type *tree;
- int def;
- char *name;
- lang_phase_type allocation_done;
+void
+ldexp_finalize_syms (void)
{
- return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done);
+ bfd_hash_traverse (&definedness_table, set_sym_sections, NULL);
}
+void
+ldexp_finish (void)
+{
+ bfd_hash_table_free (&definedness_table);
+}
projects / deliverable / binutils-gdb.git / blobdiff