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Move .sdata2/.sbss2 into read-only section

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Michael Meissner 1996-02-03 00:31:03 +00:00
parent fcfcbf27be
commit c2b6884b97
1 changed files with 42 additions and 10 deletions
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52
ld/scripttempl/elfppc.sc
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@ -2,9 +2,9 @@
# Unusual variables checked by this code:
# NOP - two byte opcode for no-op (defaults to 0)
# DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
# OTHER_READONLY_SECTIONS - other than .text .init .ctors .rodata ...
# OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
# (e.g., .PARISC.milli)
# OTHER_READWRITE_SECTIONS - other than .data .bss .sdata ...
# OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
# (e.g., .PARISC.global)
# OTHER_SECTIONS - at the end
# EXECUTABLE_SYMBOLS - symbols that must be defined for an
@ -61,7 +61,11 @@ SECTIONS
.rela.fini ${RELOCATING-0} : { *(.rela.fini) }
.rela.bss ${RELOCATING-0} : { *(.rela.bss) }
.rela.plt ${RELOCATING-0} : { *(.rela.plt) }
.init ${RELOCATING-0} : { *(.init) } =${NOP-0}
.rela.sdata ${RELOCATING-0} : { *(.rela.sdata2) }
.rela.sbss ${RELOCATING-0} : { *(.rela.sbss2) }
.rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2) }
.rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2) }
.init ${RELOCATING-0} : { *(.init) } =${NOP-0}
${DATA_PLT-${PLT}}
.text ${RELOCATING-0} :
{
@ -72,13 +76,30 @@ SECTIONS
} =${NOP-0}
${RELOCATING+_etext = .;}
${RELOCATING+PROVIDE (etext = .);}
.fini ${RELOCATING-0} : { *(.fini) } =${NOP-0}
.rodata ${RELOCATING-0} : { *(.rodata) }
.rodata1 ${RELOCATING-0} : { *(.rodata1) }
.fini ${RELOCATING-0} : { *(.fini) } =${NOP-0}
.rodata ${RELOCATING-0} : { *(.rodata) }
.rodata1 ${RELOCATING-0} : { *(.rodata1) }
${CREATE_SHLIB-
.sdata2 ${RELOCATING-0} : { *(.sdata2) }
.sbss2 ${RELOCATING-0} : { *(.sbss2) } }
${RELOCATING+${OTHER_READONLY_SECTIONS}}
/* Read-write section, merged into data segment: */
/* Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up. It would
be more correct to do this:
${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (ALIGN(8) & (${MAXPAGESIZE} - 1))};}
The current expression does not correctly handle the case of a
text segment ending precisely at the end of a page; it causes the
data segment to skip a page. The above expression does not have
this problem, but it will currently (2/95) cause BFD to allocate
a single segment, combining both text and data, for this case.
This will prevent the text segment from being shared among
multiple executions of the program; I think that is more
important than losing a page of the virtual address space (note
that no actual memory is lost; the page which is skipped can not
be referenced). */
${RELOCATING+. = ${DATA_ADDR- ALIGN(8) + ${MAXPAGESIZE}};}
.data ${RELOCATING-0} :
{
${RELOCATING+${DATA_START_SYMBOLS}}
@ -88,8 +109,6 @@ SECTIONS
.data1 ${RELOCATING-0} : { *(.data1) }
${RELOCATING+${OTHER_READWRITE_SECTIONS}}
.sdata2 ${RELOCATING-0} : { *(.sdata2) }
.sbss2 ${RELOCATING-0} : { *(.sbss2) }
.got1 ${RELOCATING-0} : { *(.got1) }
.dynamic ${RELOCATING-0} : { *(.dynamic) }
@ -117,10 +136,12 @@ SECTIONS
${RELOCATING+PROVIDE (_GLOBAL_OFFSET_TABLE_ = .);}
.got ${RELOCATING-0} : { *(.got) }
.got.plt ${RELOCATING-0} : { *(.got.plt) }
${CREATE_SHLIB+
.sdata2 ${RELOCATING-0} : { *(.sdata2) }
.sbss2 ${RELOCATING-0} : { *(.sbss2) } }
${RELOCATING+PROVIDE (_GOT_END_ = .);}
${DATA_PLT+${PLT}}
/* We want the small data sections together, so single-instruction offsets
can access them all, and initialized data all before uninitialized, so
we can shorten the on-disk segment size. */
@ -150,6 +171,17 @@ SECTIONS
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
/* DWARF debug sections.
Symbols in the .debug DWARF section are relative to the beginning of the
section so we begin .debug at 0. It's not clear yet what needs to happen
for the others. */
.debug 0 : { *(.debug) }
.debug_srcinfo 0 : { *(.debug_srcinfo) }
.debug_aranges 0 : { *(.debug_aranges) }
.debug_pubnames 0 : { *(.debug_pubnames) }
.debug_sfnames 0 : { *(.debug_sfnames) }
.line 0 : { *(.line) }
/* These must appear regardless of ${RELOCATING}. */
${OTHER_SECTIONS}
}