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Revert ld ASCII support
Revert "Prevent the ASCII linker script directive from generating huge amounts of padding if the size expression is not a constant." This reverts commitadbe951fc9. Revert "ld test asciz and ascii fails" This reverts the ascii.d part of commit5f497256be. Revert "Add support for the ASCII directive inside linker scripts." This mostly reverts commit9fe129a410leaving the asciz.d and asciz.t changes in place.
This commit is contained in:
Alan Modra
parent
75bd292bea
commit
a4d5aec71e
24
ld/ChangeLog
24
ld/ChangeLog
@ -1,8 +1,3 @@
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2023-03-03 Nick Clifton <nickc@redhat.com>
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PR 30193
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* ldgram.y (ASCII): Fail if the size is not a constant.
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2023-02-23 Fangrui Song <i@maskray.me>
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* emultempl/riscvelf.em: Add option parsing.
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@ -17,25 +12,6 @@
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* pe-dll.c (pe_dll_build_sections): Do not build an edata section
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if all symbols are being excluded.
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2023-02-16 Ulf Samuelsson <binutils@emagii.com>
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Nick Clifton <nickc@redhat.com>
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* ldlex.l: Add ASCII token.
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* ldgram.y: Add parsing of the ASCII command.
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* ldlang.c (lang_add_string): Add maximum size parameter. Move
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escape character handling code into separate function.
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* ldlang.h (lang_add_string): Update prototype.
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* NEWS: Mention the new feature.
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* ld.texi (Output Section Data): Document the new directives.
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* testsuite/ld-scripts/asciz.t: Adjust to work on more architectures
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and to test more aspects of the ASCIZ directive.
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* testsuite/ld-scripts/asciz.d: Adjust to match the changes to the
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test linker script.
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* testsuite/ld-scripts/ascii.d: New test driver.
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* testsuite/ld-scripts/ascii.s: New test assembler source.
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* testsuite/ld-scripts/ascii.t: New test script.
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* testsuite/ld-scripts/script.exp: Run the new test.
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2023-02-15 Nick Clifton <nickc@redhat.com>
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PR 30078
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8
ld/NEWS
8
ld/NEWS
@ -1,12 +1,6 @@
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-*- text -*-
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* The linker script syntax has two new commands for inserting text into output
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sections:
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ASCII (<size>) "string"
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This will reserve a zero filled block of <size> bytes at the current
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location and insert "string" at the beginning of the block. If the string
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is too long, it will be truncated.
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ASCIZ "string"
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* The linker script syntax has a new command for output sections: ASCIZ "string"
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This will insert a zero-terminated string at the current location.
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Changes in 2.40:
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53
ld/ld.texi
53
ld/ld.texi
@ -5308,6 +5308,7 @@ C identifiers because they contain a @samp{.} character.
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@cindex data
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@cindex section data
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@cindex output section data
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@kindex ASCIZ ``@var{string}''
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@kindex BYTE(@var{expression})
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@kindex SHORT(@var{expression})
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@kindex LONG(@var{expression})
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@ -5344,6 +5345,18 @@ When the object file format does not have an explicit endianness, as is
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true of, for example, S-records, the value will be stored in the
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endianness of the first input object file.
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You can include a zero-terminated string in an output section by using
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@code{ASCIZ}. The keyword is followed by a string which is stored at
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the current value of the location counter adding a zero byte at the
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end. If the string includes spaces it must be enclosed in double
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quotes. The string may contain '\n', '\r', '\t' and octal numbers.
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Hex numbers are not supported.
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For example, this string of 16 characters will create a 17 byte area
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@smallexample
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ASCIZ "This is 16 bytes"
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@end smallexample
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Note---these commands only work inside a section description and not
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between them, so the following will produce an error from the linker:
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@smallexample
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@ -5354,46 +5367,6 @@ whereas this will work:
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SECTIONS @{@ .text : @{@ *(.text) ; LONG(1) @}@ .data : @{@ *(.data) @}@ @}@
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@end smallexample
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@cindex output section strings
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@kindex ASCII (@var{expression}) ``@var{string}''
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@kindex ASCIZ ``@var{string}''
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You can include a zero-terminated string in an output section by using
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@code{ASCIZ}. The keyword is followed by a string which is stored at
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the current value of the location counter including adding a zero byte
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at the end. Any length of string is supported by this directive.
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You can include a fixed size string in an output section by using
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@code{ASCII}. The keyword is followed by a size enclosed in
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parentheses and then a string. The string is stored at the current
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value of the location counter and zero bytes are added at the end to
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fill up to the specified size. Note the fill value is ignored for
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this padding.
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If the string is too long, a warning is issued and the string is
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truncated. The string will still be zero-terminated in this case.
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If the expression evaluates to zero then the directive will be treated
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as if it were @code{ASCIZ} instead.
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If the string in an @code{ASCII} or @code{ASCIZ} command includes spaces
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it must be enclosed in double quotes.
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The string can have C escape characters like '\n', '\r', '\t' and
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octal numbers. The '\"' escape is not supported. Nor are escaped hex
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values.
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Example 1: This is string of 16 characters and will create a 32 byte
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area:
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@smallexample
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ASCII (32) "This is 16 bytes"
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@end smallexample
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Example 2: This is a string of 16 characters and will create a 17 byte
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area:
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@smallexample
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ASCIZ "This is 16 bytes"
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@end smallexample
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@kindex FILL(@var{expression})
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@cindex holes, filling
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@cindex unspecified memory
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13
ld/ldgram.y
13
ld/ldgram.y
@ -125,7 +125,7 @@ static int error_index;
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%right UNARY
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%token END
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%left <token> '('
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%token <token> ALIGN_K BLOCK BIND QUAD SQUAD LONG SHORT BYTE ASCII ASCIZ
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%token <token> ALIGN_K BLOCK BIND QUAD SQUAD LONG SHORT BYTE ASCIZ
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%token SECTIONS PHDRS INSERT_K AFTER BEFORE
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%token DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END DATA_SEGMENT_END
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%token SORT_BY_NAME SORT_BY_ALIGNMENT SORT_NONE
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@ -668,18 +668,9 @@ statement:
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{
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lang_add_data ((int) $1, $3);
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}
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| ASCII '(' mustbe_exp ')' NAME
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{
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/* 'value' is a memory leak, do we care? */
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etree_type *value = $3;
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if (value->type.node_code == INT)
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lang_add_string (value->value.value, $5);
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else
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einfo (_("%X%P:%pS: ASCII expression must be an integer\n"), NULL);
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}
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| ASCIZ NAME
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{
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lang_add_string (0, $2);
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lang_add_string ($2);
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}
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| FILL '(' fill_exp ')'
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{
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69
ld/ldlang.c
69
ld/ldlang.c
@ -8400,20 +8400,15 @@ lang_add_data (int type, union etree_union *exp)
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new_stmt->type = type;
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}
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/* Convert escape codes in S.
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Supports \n, \r, \t and \NNN octals.
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Returns a copy of S in a malloc'ed buffer. */
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static char *
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convert_string (const char * s)
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void
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lang_add_string (const char *s)
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{
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size_t len = strlen (s);
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size_t i;
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bool escape = false;
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char * buffer = malloc (len + 1);
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char * b;
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bfd_vma len = strlen (s);
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bfd_vma i;
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bool escape = false;
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for (i = 0, b = buffer; i < len; i++)
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/* Add byte expressions until end of string. */
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for (i = 0 ; i < len; i++)
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{
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char c = *s++;
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@ -8448,7 +8443,7 @@ convert_string (const char * s)
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value += (c - '0');
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i++;
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s++;
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c = *s;
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if ((c >= '0') && (c <= '7'))
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{
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@ -8466,58 +8461,26 @@ convert_string (const char * s)
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i--;
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s--;
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}
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c = value;
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}
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break;
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}
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lang_add_data (BYTE, exp_intop (c));
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escape = false;
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}
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else
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{
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if (c == '\\')
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{
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escape = true;
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continue;
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}
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escape = true;
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else
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lang_add_data (BYTE, exp_intop (c));
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}
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* b ++ = c;
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}
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* b = 0;
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return buffer;
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}
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void
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lang_add_string (size_t size, const char *s)
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{
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size_t len;
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size_t i;
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char * string;
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string = convert_string (s);
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len = strlen (string);
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/* Check if it is ASCIZ command (len == 0) */
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if (size == 0)
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/* Make sure that we include the terminating nul byte. */
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size = len + 1;
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else if (len >= size)
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{
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len = size - 1;
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einfo (_("%P:%pS: warning: ASCII string does not fit in allocated space,"
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" truncated\n"), NULL);
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}
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for (i = 0 ; i < len ; i++)
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lang_add_data (BYTE, exp_intop (string[i]));
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while (i++ < size)
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lang_add_data (BYTE, exp_intop ('\0'));
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free (string);
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/* Remeber to terminate the string. */
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lang_add_data (BYTE, exp_intop (0));
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}
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/* Create a new reloc statement. RELOC is the BFD relocation type to
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@ -646,9 +646,8 @@ extern void pop_stat_ptr
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(void);
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extern void lang_add_data
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(int, union etree_union *);
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extern bfd_vma charcount(const char *s);
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extern void lang_add_string
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(size_t, const char *s);
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(const char *);
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extern void lang_add_reloc
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(bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
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union etree_union *);
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@ -309,7 +309,6 @@ V_IDENTIFIER [*?.$_a-zA-Z\[\]\-\!\^\\]([*?.$_a-zA-Z0-9\[\]\-\!\^\\]|::)*
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<WILD>"LONG" { RTOKEN(LONG); }
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<WILD>"SHORT" { RTOKEN(SHORT); }
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<WILD>"BYTE" { RTOKEN(BYTE); }
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<WILD>"ASCII" { RTOKEN(ASCII); }
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<WILD>"ASCIZ" { RTOKEN(ASCIZ); }
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<SCRIPT>"NOFLOAT" { RTOKEN(NOFLOAT); }
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<SCRIPT,EXPRESSION>"NOCROSSREFS" { RTOKEN(NOCROSSREFS); }
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@ -1,25 +0,0 @@
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#source: ascii.s
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#ld: -T ascii.t
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#objdump: -s -j .header
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#target: [is_elf_format] [is_coff_format]
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#notarget: tic4x-*-* tic54x-*-*
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.*: file format .*
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Contents of section .header:
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.... 70726f67 72616d20 6e616d65 00000000 program name....
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.... 656d7074 79000000 00000000 00000000 empty...........
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.... 00000000 00000000 00000000 00000000 ................
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.... 00000000 00000000 00000000 00000000 ................
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.... 00000000 00000000 00000000 00000000 ................
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.... 636f6d6d 656e7420 310a0000 00000000 comment 1.......
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.... 00000000 00000000 00000000 00000000 ................
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.... 636f6d6d 656e7420 320a0000 00000000 comment 2.......
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.... 00000000 00000000 00000000 00000000 ................
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.... 636f6d6d 656e7420 330a0000 00000000 comment 3.......
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.... 00000000 00000000 00000000 00000000 ................
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.... 636f6d6d 656e7420 340a0000 00000000 comment 4.......
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.... 00000000 00000000 49206d65 616e7420 ........I meant
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.... 746f2073 61793a20 54686973 20697320 to say: This is
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.... 77617920 746f6f20 6c6f6e67 00000000 way too long....
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#pass
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@ -1,11 +0,0 @@
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.extern ecc_start
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.section .text
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main:
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.long 0x45444F43
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.long 0x12345678
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.section .data
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.long 0x9abcdef0
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.section .bss
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.long 0
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@ -1,38 +0,0 @@
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_start = 0x000000;
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SECTIONS
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{
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. = 0x1000 + SIZEOF_HEADERS;
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.header ALIGN (0x100) (READONLY) :
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{
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ASCII (16) "program name"
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ASCII (64) "empty"
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ASCII (4 * 8) "comment 1\n"
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ASCII (32) "comment 2\n"
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ASCII (32) "comment 3\n"
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ASCII (24) "comment 4\n"
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ASCII (64) "I meant to say: This is way too long"
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}
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.text ALIGN (0x100) :
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{
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entry = .;
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*(.text)
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}
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.data : AT (0x400000)
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{
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*(.data)
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}
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. = ALIGN(0x20);
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.bss :
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{
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*(.bss)
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}
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/DISCARD/ : { *(*) }
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}
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@ -228,7 +228,6 @@ foreach test_script $test_script_list {
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}
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run_dump_test "asciz"
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run_dump_test "ascii"
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run_dump_test "align-with-input"
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run_dump_test "pr20302"
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run_dump_test "output-section-types"
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