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PR26378, sections initialised only by linker scripts are always read/write

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This changes the initialisation of output sections so that it is
possible to create read-only sections fed only from linker script
BYTE, SHORT, LONG or QUAD.  That currently isn't possible even for one
of the well-known ELF sections like .rodata, because once a section is
marked read/write that sticks.  On the other hand if we start
read-only, well-known ELF sections end up read/write as appropriate.
For example .tdata will still be SHF_ALLOC + SHF_WRITE + SHF_TLS.

	PR 26378
	* ldlang.c (map_input_to_output_sections): Start with a read-only
	section for data statements.
	* testsuite/ld-elf/size-2.d: Adjust to suit.
This commit is contained in:
Alan Modra 2020-09-12 10:49:13 +09:30
parent d3d7d1ba3b
commit 326adec374
3 changed files with 9 additions and 2 deletions
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7
ld/ChangeLog
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@ -1,3 +1,10 @@
2021-01-18 Alan Modra <amodra@gmail.com>
PR 26378
* ldlang.c (map_input_to_output_sections): Start with a read-only
section for data statements.
* testsuite/ld-elf/size-2.d: Adjust to suit.
2021-01-17 H.J. Lu <hongjiu.lu@intel.com>
PR ld/27193

2
ld/ldlang.c
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@ -4225,7 +4225,7 @@ map_input_to_output_sections
break;
}
if (os->bfd_section == NULL)
init_os (os, flags);
init_os (os, flags | SEC_READONLY);
else
os->bfd_section->flags |= flags;
break;

2
ld/testsuite/ld-elf/size-2.d
View File

@ -11,7 +11,7 @@
.* \.text +PROGBITS +0+100 [0-9a-f]+ 0+10 00 AX .*
.* \.tdata +PROGBITS +0+110 [0-9a-f]+ 0+20 00 WAT .*
.* \.tbss +NOBITS +0+130 [0-9a-f]+ 0+30 00 WAT .*
.* \.map +PROGBITS +0+130 [0-9a-f]+ 0+c 00 +WA .*
.* \.map +PROGBITS +0+130 [0-9a-f]+ 0+c 00 +A .*
#...
+PHDR +(0x0+40 0x0+40 0x0+40 0x0+a8 0x0+a8|0x0+34 0x0+34 0x0+34 0x0+60 0x0+60|0x0+34 0x0+a0 0x0+a0 0x0+60 0x0+60) R .*
+LOAD +(0x0+40 0x0+40 0x0+40 0x0+fc 0x0+fc|0x0+34 0x0+34 0x0+34 0x0+1(08|10) 0x0+1(08|10)|0x0+34 0x0+a0 0x0+a0 0x0+9c 0x0+9c) R E .*