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ld: Issue an error for GC on __patchable_function_entries section

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__patchable_function_entries section is generated by a compiler with
-fpatchable-function-entry=XX.  The assembly code looks like this:

---
	.text
	.globl	_start
	.type	_start, %function
_start:
	.section __patchable_function_entries,"aw",%progbits
	.dc.a	.LPFE1
	.text
.LPFE1:
	.byte 0
---

But --gc-sections will silently remove __patchable_function_entries
section and generate corrupt result.  This patch disallows garbage
collection on __patchable_function_entries section without linked-to
section.

bfd/

	PR ld/25490
	* elflink.c (_bfd_elf_gc_mark_extra_sections): Issue an error
	for garbage collection on __patchable_function_entries section
	without linked-to section.

ld/

	PR ld/25490
	* testsuite/ld-elf/pr25490-1.d: New file.
	* testsuite/ld-elf/pr25490-1.s: Likewise.
This commit is contained in:
H.J. Lu 2020-02-06 19:37:54 -08:00
parent b7d0721677
commit 5242a0a000
5 changed files with 32 additions and 0 deletions
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7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
2020-02-06 H.J. Lu <hongjiu.lu@intel.com>
PR ld/25490
* elflink.c (_bfd_elf_gc_mark_extra_sections): Issue an error
for garbage collection on __patchable_function_entries section
without linked-to section.
2020-02-06 H.J. Lu <hongjiu.lu@intel.com>
PR gas/25381

7
bfd/elflink.c
View File

@ -13365,6 +13365,13 @@ _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
&& (isec->flags & SEC_DEBUGGING)
&& CONST_STRNEQ (isec->name, ".debug_line."))
debug_frag_seen = TRUE;
else if (strcmp (bfd_section_name (isec),
"__patchable_function_entries") == 0
&& elf_linked_to_section (isec) == NULL)
info->callbacks->einfo (_("%F%P: %pB(%pA): error: "
"need linked-to section "
"for --gc-sections\n"),
isec->owner, isec);
}
/* If no non-note alloc section in this file will be kept, then

6
ld/ChangeLog
View File

@ -1,3 +1,9 @@
2020-02-06 H.J. Lu <hongjiu.lu@intel.com>
PR ld/25490
* testsuite/ld-elf/pr25490-1.d: New file.
* testsuite/ld-elf/pr25490-1.s: Likewise.
2020-02-06 H.J. Lu <hongjiu.lu@intel.com>
PR ld/24526

3
ld/testsuite/ld-elf/pr25490-1.d Normal file
View File

@ -0,0 +1,3 @@
#ld: --gc-sections -e _start
#target: [check_gc_sections_available]
#error: .*\(__patchable_function_entries\): error: need linked-to section for --gc-sections

9
ld/testsuite/ld-elf/pr25490-1.s Normal file
View File

@ -0,0 +1,9 @@
.text
.globl _start
.type _start, %function
_start:
.section __patchable_function_entries,"aw",%progbits
.dc.a .LPFE1
.text
.LPFE1:
.byte 0