gdb: add target_ops::supports_displaced_step
[deliverable/binutils-gdb.git] / gold / yyscript.y
index a1d58d395ce6dbb1087b0ddd970a9ab67e1bc207..d645dac2608c46de36a79765d29aab58a0892d8d 100644 (file)
@@ -1,6 +1,6 @@
-/* yyscript.y -- linker script grammer for gold.  */
+/* yyscript.y -- linker script grammar for gold.  */
 
-/* Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+/* Copyright (C) 2006-2020 Free Software Foundation, Inc.
    Written by Ian Lance Taylor <iant@google.com>.
 
    This file is part of gold.
@@ -29,6 +29,8 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include "script-c.h"
 
   uint64_t integer;
   /* An expression.  */
   Expression_ptr expr;
-  // Used for version scripts and within VERSION {}
+  /* An output section header.  */
+  struct Parser_output_section_header output_section_header;
+  /* An output section trailer.  */
+  struct Parser_output_section_trailer output_section_trailer;
+  /* A section constraint.  */
+  enum Section_constraint constraint;
+  /* A complete input section specification.  */
+  struct Input_section_spec input_section_spec;
+  /* A list of wildcard specifications, with exclusions.  */
+  struct Wildcard_sections wildcard_sections;
+  /* A single wildcard specification.  */
+  struct Wildcard_section wildcard_section;
+  /* A list of strings.  */
+  String_list_ptr string_list;
+  /* Information for a program header.  */
+  struct Phdr_info phdr_info;
+  /* Used for version scripts and within VERSION {}.  */
   struct Version_dependency_list* deplist;
   struct Version_expression_list* versyms;
   struct Version_tree* versnode;
+  enum Script_section_type section_type;
 }
 
 /* Operators, including a precedence table for expressions.  */
 %token FORCE_COMMON_ALLOCATION
 %token GLOBAL          /* global */
 %token GROUP
+%token HIDDEN
 %token HLL
 %token INCLUDE
-%token INFO
 %token INHIBIT_COMMON_ALLOCATION
+%token INFO
 %token INPUT
 %token KEEP
+%token LEN
 %token LENGTH          /* LENGTH, l, len */
 %token LOADADDR
 %token LOCAL           /* local */
 %token NOLOAD
 %token ONLY_IF_RO
 %token ONLY_IF_RW
+%token ORG
 %token ORIGIN          /* ORIGIN, o, org */
 %token OUTPUT
 %token OUTPUT_ARCH
 %token SIZEOF
 %token SIZEOF_HEADERS  /* SIZEOF_HEADERS, sizeof_headers */
 %token SORT_BY_ALIGNMENT
+%token SORT_BY_INIT_PRIORITY
 %token SORT_BY_NAME
 %token SPECIAL
 %token SQUAD
 %token PARSING_LINKER_SCRIPT
 %token PARSING_VERSION_SCRIPT
 %token PARSING_DEFSYM
+%token PARSING_DYNAMIC_LIST
+%token PARSING_SECTIONS_BLOCK
+%token PARSING_SECTION_COMMANDS
+%token PARSING_MEMORY_DEF
 
 /* Non-terminal types, where needed.  */
 
 %type <expr> parse_exp exp
+%type <expr> opt_at opt_align opt_subalign opt_fill
+%type <output_section_header> section_header opt_address_and_section_type
+%type <section_type> section_type
+%type <output_section_trailer> section_trailer
+%type <constraint> opt_constraint
+%type <string_list> opt_phdr
+%type <integer> data_length
+%type <input_section_spec> input_section_no_keep
+%type <wildcard_sections> wildcard_sections
+%type <wildcard_section> wildcard_file wildcard_section
+%type <string_list> exclude_names
+%type <string> wildcard_name
+%type <integer> phdr_type memory_attr
+%type <phdr_info> phdr_info
 %type <versyms> vers_defns
 %type <versnode> vers_tag
 %type <deplist> verdep
@@ -195,6 +236,10 @@ top:
          PARSING_LINKER_SCRIPT linker_script
        | PARSING_VERSION_SCRIPT version_script
        | PARSING_DEFSYM defsym_expr
+        | PARSING_DYNAMIC_LIST dynamic_list_expr
+        | PARSING_SECTIONS_BLOCK sections_block
+        | PARSING_SECTION_COMMANDS section_cmds
+        | PARSING_MEMORY_DEF memory_defs
        ;
 
 /* A file contains a list of commands.  */
@@ -205,18 +250,55 @@ linker_script:
 
 /* A command which may appear at top level of a linker script.  */
 file_cmd:
-         GROUP
+         EXTERN '(' extern_name_list ')'
+       | FORCE_COMMON_ALLOCATION
+           { script_set_common_allocation(closure, 1); }
+       | GROUP
            { script_start_group(closure); }
          '(' input_list ')'
            { script_end_group(closure); }
+       | INHIBIT_COMMON_ALLOCATION
+           { script_set_common_allocation(closure, 0); }
+       | INPUT '(' input_list ')'
+       | MEMORY '{' memory_defs '}'
         | OPTION '(' string ')'
            { script_parse_option(closure, $3.value, $3.length); }
+       | OUTPUT_FORMAT '(' string ')'
+           {
+             if (!script_check_output_format(closure, $3.value, $3.length,
+                                             NULL, 0, NULL, 0))
+               YYABORT;
+           }
+       | OUTPUT_FORMAT '(' string ',' string ',' string ')'
+           {
+             if (!script_check_output_format(closure, $3.value, $3.length,
+                                             $5.value, $5.length,
+                                             $7.value, $7.length))
+               YYABORT;
+           }
+       | PHDRS '{' phdrs_defs '}'
+       | SEARCH_DIR '(' string ')'
+           { script_add_search_dir(closure, $3.value, $3.length); }
+       | SECTIONS '{'
+           { script_start_sections(closure); }
+         sections_block '}'
+           { script_finish_sections(closure); }
+       | TARGET_K '(' string ')'
+           { script_set_target(closure, $3.value, $3.length); }
         | VERSIONK '{'
             { script_push_lex_into_version_mode(closure); }
           version_script '}'
             { script_pop_lex_mode(closure); }
-       | file_or_sections_cmd
+       | ENTRY '(' string ')'
+           { script_set_entry(closure, $3.value, $3.length); }
+       | assignment end
+       | ASSERT_K '(' parse_exp ',' string ')'
+           { script_add_assertion(closure, $3, $5.value, $5.length); }
+       | INCLUDE string
+           { script_include_directive(PARSING_LINKER_SCRIPT, closure,
+                                      $2.value, $2.length); }
        | ignore_cmd
+       | ';'
        ;
 
 /* Top level commands which we ignore.  The GNU linker uses these to
@@ -224,9 +306,26 @@ file_cmd:
    these is more-or-less OK since most scripts simply explicitly
    choose the default.  */
 ignore_cmd:
-         OUTPUT_FORMAT '(' string ')'
-       | OUTPUT_FORMAT '(' string ',' string ',' string ')'
-       | OUTPUT_ARCH '(' string ')'
+         OUTPUT_ARCH '(' string ')'
+       ;
+
+/* A list of external undefined symbols.  We put the lexer into
+   expression mode so that commas separate names; this is what the GNU
+   linker does.  */
+
+extern_name_list:
+           { script_push_lex_into_expression_mode(closure); }
+         extern_name_list_body
+           { script_pop_lex_mode(closure); }
+       ;
+
+extern_name_list_body:
+         string
+           { script_add_extern(closure, $1.value, $1.length); }
+       | extern_name_list_body string
+           { script_add_extern(closure, $2.value, $2.length); }
+       | extern_name_list_body ',' string
+           { script_add_extern(closure, $3.value, $3.length); }
        ;
 
 /* A list of input file names.  */
@@ -239,18 +338,479 @@ input_list:
 input_list_element:
          string
            { script_add_file(closure, $1.value, $1.length); }
+       | '-' STRING
+           { script_add_library(closure, $2.value, $2.length); }
        | AS_NEEDED
            { script_start_as_needed(closure); }
          '(' input_list ')'
            { script_end_as_needed(closure); }
        ;
 
-/* A command which may appear at the top level of a linker script, or
-   within a SECTIONS block.  */
-file_or_sections_cmd:
+/* Commands in a SECTIONS block.  */
+sections_block:
+         sections_block section_block_cmd
+       | /* empty */
+       ;
+
+/* A command which may appear within a SECTIONS block.  */
+section_block_cmd:
          ENTRY '(' string ')'
            { script_set_entry(closure, $3.value, $3.length); }
        | assignment end
+       | ASSERT_K '(' parse_exp ',' string ')'
+           { script_add_assertion(closure, $3, $5.value, $5.length); }
+       | INCLUDE string
+           { script_include_directive(PARSING_SECTIONS_BLOCK, closure,
+                                      $2.value, $2.length); }
+       | string section_header
+           { script_start_output_section(closure, $1.value, $1.length, &$2); }
+         '{' section_cmds '}' section_trailer
+           { script_finish_output_section(closure, &$7); }
+       ;
+
+/* The header of an output section in a SECTIONS block--everything
+   after the name.  */
+section_header:
+           { script_push_lex_into_expression_mode(closure); }
+         opt_address_and_section_type opt_at opt_align opt_subalign
+           { script_pop_lex_mode(closure); }
+         opt_constraint
+           {
+             $$.address = $2.address;
+             $$.section_type = $2.section_type;
+             $$.load_address = $3;
+             $$.align = $4;
+             $$.subalign = $5;
+             $$.constraint = $7;
+           }
+       ;
+
+/* The optional address followed by the optional section type.  This
+   is a separate nonterminal to avoid a shift/reduce conflict on
+   '(' in section_header.  */
+
+opt_address_and_section_type:
+       ':'
+           {
+             $$.address = NULL;
+             $$.section_type = SCRIPT_SECTION_TYPE_NONE;
+           }
+       | '(' ')' ':'
+           {
+             $$.address = NULL;
+             $$.section_type = SCRIPT_SECTION_TYPE_NONE;
+           }
+       | exp ':'
+           {
+             $$.address = $1;
+             $$.section_type = SCRIPT_SECTION_TYPE_NONE;
+           }
+       | exp '(' ')' ':'
+           {
+             $$.address = $1;
+             $$.section_type = SCRIPT_SECTION_TYPE_NONE;
+           }
+       | '(' section_type ')' ':'
+           {
+             $$.address = NULL;
+             $$.section_type = $2;
+           }
+       | exp '(' section_type ')' ':'
+           {
+             $$.address = $1;
+             $$.section_type = $3;
+           }
+       ;
+
+/* We only support NOLOAD.  */
+section_type:
+       NOLOAD
+           { $$ = SCRIPT_SECTION_TYPE_NOLOAD; }
+       | DSECT
+           {
+             yyerror(closure, "DSECT section type is unsupported");
+             $$ = SCRIPT_SECTION_TYPE_DSECT;
+           }
+       | COPY
+           {
+             yyerror(closure, "COPY section type is unsupported");
+             $$ = SCRIPT_SECTION_TYPE_COPY;
+           }
+       | INFO
+           {
+             yyerror(closure, "INFO section type is unsupported");
+             $$ = SCRIPT_SECTION_TYPE_INFO;
+           }
+       | OVERLAY
+           {
+             yyerror(closure, "OVERLAY section type is unsupported");
+             $$ = SCRIPT_SECTION_TYPE_OVERLAY;
+           }
+       ;
+
+/* The address at which an output section should be loaded.  */
+opt_at:
+         /* empty */
+           { $$ = NULL; }
+       | AT '(' exp ')'
+           { $$ = $3; }
+       ;
+
+/* The alignment of an output section.  */
+opt_align:
+         /* empty */
+           { $$ = NULL; }
+       | ALIGN_K '(' exp ')'
+           { $$ = $3; }
+       ;
+
+/* The input section alignment within an output section.  */
+opt_subalign:
+         /* empty */
+           { $$ = NULL; }
+       | SUBALIGN '(' exp ')'
+           { $$ = $3; }
+       ;
+
+/* A section constraint.  */
+opt_constraint:
+         /* empty */
+           { $$ = CONSTRAINT_NONE; }
+       | ONLY_IF_RO
+           { $$ = CONSTRAINT_ONLY_IF_RO; }
+       | ONLY_IF_RW
+           { $$ = CONSTRAINT_ONLY_IF_RW; }
+       | SPECIAL
+           { $$ = CONSTRAINT_SPECIAL; }
+       ;
+
+/* The trailer of an output section in a SECTIONS block.  */
+section_trailer:
+         opt_memspec opt_at_memspec opt_phdr opt_fill opt_comma
+           {
+             $$.fill = $4;
+             $$.phdrs = $3;
+           }
+       ;
+
+/* A memory specification for an output section.  */
+opt_memspec:
+         '>' string
+           { script_set_section_region(closure, $2.value, $2.length, 1); }
+       | /* empty */
+       ;
+
+/* A memory specification for where to load an output section.  */
+opt_at_memspec:
+         AT '>' string
+           { script_set_section_region(closure, $3.value, $3.length, 0); }
+       | /* empty */
+       ;
+
+/* The program segment an output section should go into.  */
+opt_phdr:
+         opt_phdr ':' string
+           { $$ = script_string_list_push_back($1, $3.value, $3.length); }
+       | /* empty */
+           { $$ = NULL; }
+       ;
+
+/* The value to use to fill an output section.  FIXME: This does not
+   handle a string of arbitrary length.  */
+opt_fill:
+         '=' parse_exp
+           { $$ = $2; }
+       | /* empty */
+           { $$ = NULL; }
+       ;
+
+/* Commands which may appear within the description of an output
+   section in a SECTIONS block.  */
+section_cmds:
+         /* empty */
+       | section_cmds section_cmd
+       ;
+
+/* A command which may appear within the description of an output
+   section in a SECTIONS block.  */
+section_cmd:
+         assignment end
+       | input_section_spec
+       | data_length '(' parse_exp ')'
+           { script_add_data(closure, $1, $3); }
+       | ASSERT_K '(' parse_exp ',' string ')'
+           { script_add_assertion(closure, $3, $5.value, $5.length); }
+       | FILL '(' parse_exp ')'
+           { script_add_fill(closure, $3); }
+       | CONSTRUCTORS
+           {
+             /* The GNU linker uses CONSTRUCTORS for the a.out object
+                file format.  It does nothing when using ELF.  Since
+                some ELF linker scripts use it although it does
+                nothing, we accept it and ignore it.  */
+           }
+       | SORT_BY_NAME '(' CONSTRUCTORS ')'
+       | INCLUDE string
+           { script_include_directive(PARSING_SECTION_COMMANDS, closure,
+                                      $2.value, $2.length); }
+       | ';'
+       ;
+
+/* The length of data which may appear within the description of an
+   output section in a SECTIONS block.  */
+data_length:
+         QUAD
+           { $$ = QUAD; }
+       | SQUAD
+           { $$ = SQUAD; }
+       | LONG
+           { $$ = LONG; }
+       | SHORT
+           { $$ = SHORT; }
+       | BYTE
+           { $$ = BYTE; }
+       ;
+
+/* An input section specification.  This may appear within the
+   description of an output section in a SECTIONS block.  */
+input_section_spec:
+         input_section_no_keep
+           { script_add_input_section(closure, &$1, 0); }
+       | KEEP '(' input_section_no_keep ')'
+           { script_add_input_section(closure, &$3, 1); }
+       ;
+
+/* An input section specification within a KEEP clause.  */
+input_section_no_keep:
+         string
+           {
+             $$.file.name = $1;
+             $$.file.sort = SORT_WILDCARD_NONE;
+             $$.input_sections.sections = NULL;
+             $$.input_sections.exclude = NULL;
+           }
+       | wildcard_file '(' wildcard_sections ')'
+           {
+             $$.file = $1;
+             $$.input_sections = $3;
+           }
+       ;
+
+/* A wildcard file specification.  */
+wildcard_file:
+         wildcard_name
+           {
+             $$.name = $1;
+             $$.sort = SORT_WILDCARD_NONE;
+           }
+       | SORT_BY_NAME '(' wildcard_name ')'
+           {
+             $$.name = $3;
+             $$.sort = SORT_WILDCARD_BY_NAME;
+           }
+       ;
+
+/* A list of wild card section specifications.  */
+wildcard_sections:
+         wildcard_sections opt_comma wildcard_section
+           {
+             $$.sections = script_string_sort_list_add($1.sections, &$3);
+             $$.exclude = $1.exclude;
+           }
+       | wildcard_section
+           {
+             $$.sections = script_new_string_sort_list(&$1);
+             $$.exclude = NULL;
+           }
+       | wildcard_sections opt_comma EXCLUDE_FILE '(' exclude_names ')'
+           {
+             $$.sections = $1.sections;
+             $$.exclude = script_string_list_append($1.exclude, $5);
+           }
+       | EXCLUDE_FILE '(' exclude_names ')'
+           {
+             $$.sections = NULL;
+             $$.exclude = $3;
+           }
+       ;
+
+/* A single wild card specification.  */
+wildcard_section:
+         wildcard_name
+           {
+             $$.name = $1;
+             $$.sort = SORT_WILDCARD_NONE;
+           }
+       | SORT_BY_NAME '(' wildcard_section ')'
+           {
+             $$.name = $3.name;
+             switch ($3.sort)
+               {
+               case SORT_WILDCARD_NONE:
+                 $$.sort = SORT_WILDCARD_BY_NAME;
+                 break;
+               case SORT_WILDCARD_BY_NAME:
+               case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT:
+                 break;
+               case SORT_WILDCARD_BY_ALIGNMENT:
+               case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME:
+                 $$.sort = SORT_WILDCARD_BY_NAME_BY_ALIGNMENT;
+                 break;
+               default:
+                 abort();
+               }
+           }
+       | SORT_BY_ALIGNMENT '(' wildcard_section ')'
+           {
+             $$.name = $3.name;
+             switch ($3.sort)
+               {
+               case SORT_WILDCARD_NONE:
+                 $$.sort = SORT_WILDCARD_BY_ALIGNMENT;
+                 break;
+               case SORT_WILDCARD_BY_ALIGNMENT:
+               case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME:
+                 break;
+               case SORT_WILDCARD_BY_NAME:
+               case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT:
+                 $$.sort = SORT_WILDCARD_BY_ALIGNMENT_BY_NAME;
+                 break;
+               default:
+                 abort();
+               }
+           }
+       | SORT_BY_INIT_PRIORITY '(' wildcard_name ')'
+           {
+             $$.name = $3;
+             $$.sort = SORT_WILDCARD_BY_INIT_PRIORITY;
+           }
+       ;
+
+/* A list of file names to exclude.  */
+exclude_names:
+         exclude_names opt_comma wildcard_name
+           { $$ = script_string_list_push_back($1, $3.value, $3.length); }
+       | wildcard_name
+           { $$ = script_new_string_list($1.value, $1.length); }
+       ;
+
+/* A single wildcard name.  We recognize '*' and '?' specially since
+   they are expression tokens.  */
+wildcard_name:
+         string
+           { $$ = $1; }
+       | '*'
+           {
+             $$.value = "*";
+             $$.length = 1;
+           }
+       | '?'
+           {
+             $$.value = "?";
+             $$.length = 1;
+           }
+       ;
+
+/* A list of MEMORY definitions.  */
+memory_defs:
+         memory_defs opt_comma memory_def
+       | /* empty */
+       ;
+
+/* A single MEMORY definition.  */
+memory_def:
+         string memory_attr ':' memory_origin '=' parse_exp opt_comma memory_length '=' parse_exp
+         { script_add_memory(closure, $1.value, $1.length, $2, $6, $10); }
+       |
+         INCLUDE string
+         { script_include_directive(PARSING_MEMORY_DEF, closure,
+                                    $2.value, $2.length); }
+       |
+       ;
+
+/* The (optional) attributes of a MEMORY region.  */
+memory_attr:
+         '(' string ')'
+         { $$ = script_parse_memory_attr(closure, $2.value, $2.length, 0); }
+        | /* Inverted attributes. */
+         '(' '!' string ')'
+         { $$ = script_parse_memory_attr(closure, $3.value, $3.length, 1); }
+       | /* empty */
+           { $$ = 0; }
+       ;
+
+memory_origin:
+          ORIGIN
+       |
+         ORG
+       |
+         'o'
+       ;
+
+memory_length:
+          LENGTH
+       |
+         LEN
+       |
+         'l'
+       ;
+
+/* A list of program header definitions.  */
+phdrs_defs:
+         phdrs_defs phdr_def
+       | /* empty */
+       ;
+
+/* A program header definition.  */
+phdr_def:
+         string phdr_type phdr_info ';'
+           { script_add_phdr(closure, $1.value, $1.length, $2, &$3); }
+       ;
+
+/* A program header type.  The GNU linker accepts a general expression
+   here, but that would be a pain because we would have to dig into
+   the expression structure.  It's unlikely that anybody uses anything
+   other than a string or a number here, so that is all we expect.  */
+phdr_type:
+         string
+           { $$ = script_phdr_string_to_type(closure, $1.value, $1.length); }
+       | INTEGER
+           { $$ = $1; }
+       ;
+
+/* Additional information for a program header.  */
+phdr_info:
+         /* empty */
+           { memset(&$$, 0, sizeof(struct Phdr_info)); }
+       | string phdr_info
+           {
+             $$ = $2;
+             if ($1.length == 7 && strncmp($1.value, "FILEHDR", 7) == 0)
+               $$.includes_filehdr = 1;
+             else
+               yyerror(closure, "PHDRS syntax error");
+           }
+       | PHDRS phdr_info
+           {
+             $$ = $2;
+             $$.includes_phdrs = 1;
+           }
+       | string '(' INTEGER ')' phdr_info
+           {
+             $$ = $5;
+             if ($1.length == 5 && strncmp($1.value, "FLAGS", 5) == 0)
+               {
+                 $$.is_flags_valid = 1;
+                 $$.flags = $3;
+               }
+             else
+               yyerror(closure, "PHDRS syntax error");
+           }
+       | AT '(' parse_exp ')' phdr_info
+           {
+             $$ = $5;
+             $$.load_address = $3;
+           }
        ;
 
 /* Set a symbol to a value.  */
@@ -305,6 +865,8 @@ assignment:
              Expression_ptr e = script_exp_binary_bitwise_or(s, $3);
              script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
            }
+       | HIDDEN '(' string '=' parse_exp ')'
+           { script_set_symbol(closure, $3.value, $3.length, $5, 0, 1); }
        | PROVIDE '(' string '=' parse_exp ')'
            { script_set_symbol(closure, $3.value, $3.length, $5, 1, 0); }
        | PROVIDE_HIDDEN '(' string '=' parse_exp ')'
@@ -373,10 +935,8 @@ exp:
            { $$ = script_exp_trinary_cond($1, $3, $5); }
        | INTEGER
            { $$ = script_exp_integer($1); }
-       | STRING
-           { $$ = script_exp_string($1.value, $1.length); }
-       | QUOTED_STRING
-           { $$ = script_exp_string($1.value, $1.length); }
+       | string
+           { $$ = script_symbol(closure, $1.value, $1.length); }
        | MAX_K '(' exp ',' exp ')'
            { $$ = script_exp_function_max($3, $5); }
        | MIN_K '(' exp ',' exp ')'
@@ -394,9 +954,9 @@ exp:
        | LOADADDR '(' string ')'
            { $$ = script_exp_function_loadaddr($3.value, $3.length); }
        | ORIGIN '(' string ')'
-           { $$ = script_exp_function_origin($3.value, $3.length); }
+           { $$ = script_exp_function_origin(closure, $3.value, $3.length); }
        | LENGTH '(' string ')'
-           { $$ = script_exp_function_length($3.value, $3.length); }
+           { $$ = script_exp_function_length(closure, $3.value, $3.length); }
        | CONSTANT '(' string ')'
            { $$ = script_exp_function_constant($3.value, $3.length); }
        | ABSOLUTE '(' exp ')'
@@ -408,14 +968,24 @@ exp:
        | BLOCK '(' exp ')'
            { $$ = script_exp_function_align(script_exp_string(".", 1), $3); }
        | DATA_SEGMENT_ALIGN '(' exp ',' exp ')'
-           { $$ = script_exp_function_data_segment_align($3, $5); }
+           {
+             script_data_segment_align(closure);
+             $$ = script_exp_function_data_segment_align($3, $5);
+           }
        | DATA_SEGMENT_RELRO_END '(' exp ',' exp ')'
-           { $$ = script_exp_function_data_segment_relro_end($3, $5); }
+           {
+             script_data_segment_relro_end(closure);
+             $$ = script_exp_function_data_segment_relro_end($3, $5);
+           }
        | DATA_SEGMENT_END '(' exp ')'
            { $$ = script_exp_function_data_segment_end($3); }
        | SEGMENT_START '(' string ',' exp ')'
            {
              $$ = script_exp_function_segment_start($3.value, $3.length, $5);
+             /* We need to take note of any SEGMENT_START expressions
+                because they change the behaviour of -Ttext, -Tdata and
+                -Tbss options.  */
+             script_saw_segment_start_expression(closure);
            }
        | ASSERT_K '(' exp ',' string ')'
            { $$ = script_exp_function_assert($3, $5.value, $5.length); }
@@ -427,6 +997,24 @@ defsym_expr:
            { script_set_symbol(closure, $1.value, $1.length, $3, 0, 0); }
        ;
 
+/* Handle the --dynamic-list option.  A dynamic list has the format
+   { sym1; sym2; extern "C++" { namespace::sym3 }; };
+   We store the symbol we see in the "local" list; that is where
+   Command_line::in_dynamic_list() will look to do its check.
+   TODO(csilvers): More than one of these brace-lists can appear, and
+   should just be merged and treated as a single list.  */
+dynamic_list_expr: dynamic_list_nodes ;
+
+dynamic_list_nodes:
+         dynamic_list_node
+       | dynamic_list_nodes dynamic_list_node
+        ;
+
+dynamic_list_node:
+          '{' vers_defns ';' '}' ';'
+            { script_new_vers_node (closure, NULL, $2); }
+        ;
+
 /* A version script.  */
 version_script:
          vers_nodes
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