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6 Commits

Author SHA1 Message Date
Fangrui Song 9e33c09647 [ELF] Keep orphan section names (.rodata.foo .text.foo) unchanged if !hasSectionsCommand 
This behavior matches GNU ld and seems reasonable.

```
// If a SECTIONS command is not specified
.text.* -> .text
.rodata.* -> .rodata
.init_array.* -> .init_array
```

A proposed Linux feature CONFIG_FG_KASLR may depend on the GNU ld behavior.

Reword a comment about -z keep-text-section-prefix and a comment about
CommonSection (deleted by rL286234).

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D75225
 2020-03-23 10:30:06 -07:00
Fangrui Song f9a0056016 [llvm-objdump] --syms: make flags closer to GNU objdump 
This fixes several issues. The behavior changes are:

A SHN_COMMON symbol does not have the 'g' flag.
An undefined symbol does not have 'g' or 'l' flag.
A STB_GLOBAL SymbolRef::ST_Unknown symbol has the 'g' flag.
A STB_LOCAL SymbolRef::ST_Unknown symbol has the 'l' flag.

Reviewed By: rupprecht

Differential Revision: https://reviews.llvm.org/D75659
 2020-03-05 09:59:53 -08:00
Fangrui Song c72d60d42f [llvm-objdump] --syms: print st_size as "%016" PRIx64 instead of "%08" PRIx64 for 64-bit objects 
This is GNU objdump's behavior and it is reasonable to match.

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D75588
 2020-03-04 12:09:27 -08:00
Fangrui Song 68fa4e8c34 [ELF] Assign RF_EXEC rank even if --no-rosegment or SECTIONS command is used 
Summary:
Currently when --no-rosegment is specified or a linker script with SECTIONS command is used,
.rodata (A) .text (AX) are assigned the same rank and .rodata may be placed after .text .
This increases the gap between .text and .bss and can cause pc-relative relocation overflow (e.g. gcc crtbegin.o crtbegin.S have R_X86_64_PC32 relocation from .text to .bss).

This patch makes SingleRoRx affect only segment layout, not section layout. As a consequence, .rodata will be placed before .text regardless of SingleRoRx.

Reviewers: espindola, ruiu, grimar, echristo, javed.absar

Subscribers: emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D48405

llvm-svn: 335627
 2018-06-26 17:04:47 +00:00
Rafael Espindola 36f2edb6fd Check the produced file instead of stderr. 
It is somewhat pointless to check that a specific error is not
produced. That is already checked by the ld.lld exit value.

Instead make the test a bit stronger by checking that the output file
has the expected symbol and section.

llvm-svn: 306496
 2017-06-28 01:46:31 +00:00
Petr Hosek 40f2866a67 [ELF] Mark symbols referenced from linker script as live 
This is necessary to ensure that sections containing symbols referenced
from linker scripts (e.g. in data commands) don't get GC'd.

Differential Revision: https://reviews.llvm.org/D34195

llvm-svn: 305452
 2017-06-15 05:34:31 +00:00