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ld/
* ld.texinfo (Options): Describe -Trodata-segment.
* ldlex.h (enum option_values): Add OPTION_TRODATA_SEGMENT.
* lexsup.c (ld_options, parse_args): Handle -Trodata-segment.
* scripttempl/elf.sc (RODATA_ADDR, SHLIB_RODATA_ADDR): Wrap
SEGMENT_START("rodata-segment", ...) + SIZEOF_HEADERS around the value.
This commit is contained in:
Roland McGrath
parent
d8a4f9280a
commit
9d5777a34c
@ -1,3 +1,11 @@
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2012-12-18 Roland McGrath <mcgrathr@google.com>
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* ld.texinfo (Options): Describe -Trodata-segment.
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* ldlex.h (enum option_values): Add OPTION_TRODATA_SEGMENT.
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* lexsup.c (ld_options, parse_args): Handle -Trodata-segment.
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* scripttempl/elf.sc (RODATA_ADDR, SHLIB_RODATA_ADDR): Wrap
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SEGMENT_START("rodata-segment", ...) + SIZEOF_HEADERS around the value.
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2012-12-17 Nick Clifton <nickc@redhat.com>
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* MAINTAINERS: Add copyright notice.
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@ -372,9 +372,9 @@ Adds @var{AUDITLIB} to the @code{DT_AUDIT} entry of the dynamic section.
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specified in the library. If specified multiple times @code{DT_AUDIT}
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will contain a colon separated list of audit interfaces to use. If the linker
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finds an object with an audit entry while searching for shared libraries,
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it will add a corresponding @code{DT_DEPAUDIT} entry in the output file.
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it will add a corresponding @code{DT_DEPAUDIT} entry in the output file.
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This option is only meaningful on ELF platforms supporting the rtld-audit
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interface.
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interface.
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@ifset I960
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@cindex architectures
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@ -472,7 +472,7 @@ Adds @var{AUDITLIB} to the @code{DT_DEPAUDIT} entry of the dynamic section.
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specified in the library. If specified multiple times @code{DT_DEPAUDIT}
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will contain a colon separated list of audit interfaces to use. This
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option is only meaningful on ELF platforms supporting the rtld-audit interface.
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The -P option is provided for Solaris compatibility.
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The -P option is provided for Solaris compatibility.
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@cindex entry point, from command line
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@kindex -e @var{entry}
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@ -1266,7 +1266,7 @@ option.
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@kindex --no-copy-dt-needed-entries
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@item --copy-dt-needed-entries
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@itemx --no-copy-dt-needed-entries
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This option affects the treatment of dynamic libraries referred to
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This option affects the treatment of dynamic libraries referred to
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by DT_NEEDED tags @emph{inside} ELF dynamic libraries mentioned on the
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command line. Normally the linker won't add a DT_NEEDED tag to the
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output binary for each library mentioned in a DT_NEEDED tag in an
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@ -1394,7 +1394,7 @@ the linker recursively marks as used any section referenced by their
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relocations. See @samp{--entry} and @samp{--undefined}.
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This option can be set when doing a partial link (enabled with option
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@samp{-r}). In this case the root of symbols kept must be explicitly
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@samp{-r}). In this case the root of symbols kept must be explicitly
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specified either by an @samp{--entry} or @samp{--undefined} option or by
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a @code{ENTRY} command in the linker script.
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@ -1837,6 +1837,13 @@ Same as @option{--section-start}, with @code{.bss}, @code{.data} or
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When creating an ELF executable or shared object, it will set the address
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of the first byte of the text segment.
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@kindex -Trodata-segment=@var{org}
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@item -Trodata-segment=@var{org}
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@cindex rodata segment origin, cmd line
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When creating an ELF executable or shared object for a target where
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the read-only data is in its own segment separate from the executable
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text, it will set the address of the first byte of the read-only data segment.
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@kindex --unresolved-symbols
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@item --unresolved-symbols=@var{method}
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Determine how to handle unresolved symbols. There are four possible
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@ -2214,8 +2221,8 @@ allow their use in executable images as well, or to (probably pointlessly!)
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disallow it in object files, by using these two options. Executable images
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generated with these long section names are slightly non-standard, carrying
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as they do a string table, and may generate confusing output when examined
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with non-GNU PE-aware tools, such as file viewers and dumpers. However,
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GDB relies on the use of PE long section names to find Dwarf-2 debug
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with non-GNU PE-aware tools, such as file viewers and dumpers. However,
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GDB relies on the use of PE long section names to find Dwarf-2 debug
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information sections in an executable image at runtime, and so if neither
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option is specified on the command-line, @command{ld} will enable long
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section names, overriding the default and technically correct behaviour,
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@ -2626,7 +2633,7 @@ Do not bind this image.
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@kindex --wdmdriver
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@item --wdmdriver
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The driver uses the MS Windows Driver Model.
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@kindex --tsaware
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@item --tsaware
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The image is Terminal Server aware.
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@ -3197,7 +3204,7 @@ systems come with three different memory setups @code{A}, @code{B} and
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@code{C}:
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@multitable @columnfractions .25 .25 .25 .25
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@item Section @tab Variant A @tab Variant B @tab Variant C
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@item .text @tab RAM @tab ROM @tab ROM
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@item .text @tab RAM @tab ROM @tab ROM
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@item .rodata @tab RAM @tab ROM @tab ROM2
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@item .data @tab RAM @tab RAM/ROM @tab RAM/ROM2
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@item .bss @tab RAM @tab RAM @tab RAM
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@ -4775,7 +4782,7 @@ Region names are stored in a separate name space, and will not conflict
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with symbol names, file names, or section names. Each memory region
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must have a distinct name within the @code{MEMORY} command. However you can
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add later alias names to existing memory regions with the @ref{REGION_ALIAS}
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command.
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command.
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@cindex memory region attributes
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The @var{attr} string is an optional list of attributes that specify
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@ -5296,7 +5303,7 @@ The target's default page size.
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So for example:
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@smallexample
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.text ALIGN (CONSTANT (MAXPAGESIZE)) : @{ *(.text) @}
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.text ALIGN (CONSTANT (MAXPAGESIZE)) : @{ *(.text) @}
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@end smallexample
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will create a text section aligned to the largest page boundary
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@ -6367,12 +6374,12 @@ are sufficient to avoid the erratum in both the scalar and vector cases.
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@cindex ARM1176 erratum workaround
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@kindex --fix-arm1176
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@kindex --no-fix-arm1176
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The @samp{--fix-arm1176} switch enables a link-time workaround for an erratum
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in certain ARM1176 processors. The workaround is enabled by default if you
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are targeting ARM v6 (excluding ARM v6T2) or earlier. It can be disabled
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The @samp{--fix-arm1176} switch enables a link-time workaround for an erratum
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in certain ARM1176 processors. The workaround is enabled by default if you
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are targeting ARM v6 (excluding ARM v6T2) or earlier. It can be disabled
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unconditionally by specifying @samp{--no-fix-arm1176}.
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Further information is available in the ``ARM1176JZ-S and ARM1176JZF-S
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Further information is available in the ``ARM1176JZ-S and ARM1176JZF-S
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Programmer Advice Notice'' available on the ARM documentation website at:
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http://infocenter.arm.com/.
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@ -6964,7 +6971,7 @@ When auto-export is in operation, @command{ld} will export all the non-local
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symbols known to belong to the system's runtime and libraries. As it will
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often not be desirable to export all of a DLL's symbols, which may include
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private functions that are not part of any public interface, the command-line
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options listed above may be used to filter symbols out from the list for
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options listed above may be used to filter symbols out from the list for
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exporting. The @samp{--output-def} option can be used in order to see the
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final list of exported symbols with all exclusions taken into effect.
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@ -68,6 +68,7 @@ enum option_values
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OPTION_TDATA,
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OPTION_TTEXT,
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OPTION_TTEXT_SEGMENT,
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OPTION_TRODATA_SEGMENT,
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OPTION_TRADITIONAL_FORMAT,
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OPTION_UR,
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OPTION_VERBOSE,
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11
ld/lexsup.c
11
ld/lexsup.c
@ -405,13 +405,13 @@ static const struct ld_option ld_options[] =
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{ {"pic-executable", no_argument, NULL, OPTION_PIE},
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'\0', NULL, NULL, TWO_DASHES },
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{ {"sort-common", optional_argument, NULL, OPTION_SORT_COMMON},
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'\0', N_("[=ascending|descending]"),
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N_("Sort common symbols by alignment [in specified order]"),
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'\0', N_("[=ascending|descending]"),
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N_("Sort common symbols by alignment [in specified order]"),
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TWO_DASHES },
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{ {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
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'\0', NULL, NULL, NO_HELP },
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{ {"sort-section", required_argument, NULL, OPTION_SORT_SECTION},
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'\0', N_("name|alignment"),
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'\0', N_("name|alignment"),
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N_("Sort sections by name or maximum alignment"), TWO_DASHES },
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{ {"spare-dynamic-tags", required_argument, NULL, OPTION_SPARE_DYNAMIC_TAGS},
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'\0', N_("COUNT"), N_("How many tags to reserve in .dynamic section"),
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@ -441,6 +441,8 @@ static const struct ld_option ld_options[] =
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'\0', N_("ADDRESS"), N_("Set address of .text section"), ONE_DASH },
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{ {"Ttext-segment", required_argument, NULL, OPTION_TTEXT_SEGMENT},
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'\0', N_("ADDRESS"), N_("Set address of text segment"), ONE_DASH },
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{ {"Trodata-segment", required_argument, NULL, OPTION_TRODATA_SEGMENT},
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'\0', N_("ADDRESS"), N_("Set address of rodata segment"), ONE_DASH },
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{ {"unresolved-symbols=<method>", required_argument, NULL,
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OPTION_UNRESOLVED_SYMBOLS},
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'\0', NULL, N_("How to handle unresolved symbols. <method> is:\n"
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@ -1191,6 +1193,9 @@ parse_args (unsigned argc, char **argv)
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case OPTION_TTEXT_SEGMENT:
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set_segment_start (".text-segment", optarg);
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break;
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case OPTION_TRODATA_SEGMENT:
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set_segment_start (".rodata-segment", optarg);
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break;
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case OPTION_TRADITIONAL_FORMAT:
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link_info.traditional_format = TRUE;
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break;
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@ -492,12 +492,26 @@ cat <<EOF
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EOF
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if test -n "${SEPARATE_CODE}"; then
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if test -n "${RODATA_ADDR}"; then
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RODATA_ADDR="\
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SEGMENT_START(\"rodata-segment\", ${RODATA_ADDR}) + SIZEOF_HEADERS"
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else
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RODATA_ADDR="ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))}"
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RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${RODATA_ADDR})"
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fi
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if test -n "${SHLIB_RODATA_ADDR}"; then
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SHLIB_RODATA_ADDR="\
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SEGMENT_START(\"rodata-segment\", ${SHLIB_RODATA_ADDR}) + SIZEOF_HEADERS"
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else
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SHLIB_RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${SHLIB_RODATA_ADDR})"
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SHLIB_RODATA_ADDR="ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))"
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fi
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cat <<EOF
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/* Adjust the address for the rodata segment. We want to adjust up to
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the same address within the page on the next page up. */
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${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${RODATA_ADDR-ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))};}}}
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${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_RODATA_ADDR-ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))};}}
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${CREATE_PIE+${RELOCATING+. = ${SHLIB_RODATA_ADDR-ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))};}}
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${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${RODATA_ADDR};}}}
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${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_RODATA_ADDR};}}
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${CREATE_PIE+${RELOCATING+. = ${SHLIB_RODATA_ADDR};}}
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EOF
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emit_early_ro
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emit_dyn
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@ -650,8 +664,8 @@ cat <<EOF
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.debug_ranges 0 : { *(.debug_ranges) }
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/* DWARF Extension. */
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.debug_macro 0 : { *(.debug_macro) }
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.debug_macro 0 : { *(.debug_macro) }
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${TINY_DATA_SECTION}
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${TINY_BSS_SECTION}
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