2017-09-21 07:49:50 +08:00
|
|
|
# REQUIRES: aarch64
|
|
|
|
|
|
|
|
|
|
# RUN: llvm-mc -filetype=obj -triple=aarch64-linux-none %s -o %t.o
|
2017-10-06 17:37:44 +08:00
|
|
|
# RUN: ld.lld --hash-style=sysv -shared %t.o -o %t
|
2017-09-21 07:49:50 +08:00
|
|
|
# RUN: llvm-objdump %t -d | FileCheck %s --check-prefix=DISASM
|
2018-11-07 03:34:22 +08:00
|
|
|
# RUN: llvm-readelf %t --symbols | FileCheck %s --check-prefix=SYM
|
2017-09-21 07:49:50 +08:00
|
|
|
|
|
|
|
|
# It would be much easier to understand/read this test if llvm-objdump would print
|
|
|
|
|
# the immediates in hex.
|
|
|
|
|
# IMM = hex(65540) = 0x10004
|
|
|
|
|
# PC = 0x10000
|
|
|
|
|
# As the relocation is PC-relative, IMM + PC = 0x20004 which is the VA of the
|
|
|
|
|
# correct symbol.
|
|
|
|
|
|
|
|
|
|
# DISASM: Disassembly of section .text:
|
|
|
|
|
# DISASM-NEXT: $x.0:
|
[ELF] Simplify RelRo, TLS, NOBITS section ranks and make RW PT_LOAD start with RelRo
Old: PT_LOAD(.data | PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .bss)
New: PT_LOAD(PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .data .bss)
The placement of | indicates page alignment caused by PT_GNU_RELRO. The
new layout has simpler rules and saves space for many cases.
Old size: roundup(.data) + roundup(.data.rel.ro)
New size: roundup(.data.rel.ro + .bss.rel.ro) + .data
Other advantages:
* At runtime the 3 memory mappings decrease to 2.
* start(PT_TLS) = start(PT_GNU_RELRO) = start(RW PT_LOAD). This
simplifies binary manipulation tools.
GNU strip before 2.31 discards PT_GNU_RELRO if its
address is not equal to the start of its associated PT_LOAD.
This has been fixed by https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f2731e0c374e5323ce4cdae2bcc7b7fe22da1a6f
But with this change, we will be compatible with GNU strip before 2.31
* Before, .got.plt (non-relro by default) was placed before .got (relro
by default), which made it impossible to have _GLOBAL_OFFSET_TABLE_
(start of .got.plt on x86-64) equal to the end of .got (R_GOT*_FROM_END)
(https://bugs.llvm.org/show_bug.cgi?id=36555). With the new ordering, we
can improve on this regard if we'd like to.
Reviewers: ruiu, espindola, pcc
Subscribers: emaste, arichardson, llvm-commits, joerg, jdoerfert
Differential Revision: https://reviews.llvm.org/D56828
llvm-svn: 356117
2019-03-14 11:47:45 +08:00
|
|
|
# DISASM-NEXT: 10000: 28 00 10 58 ldr x8, #131076
|
2017-09-21 07:49:50 +08:00
|
|
|
|
|
|
|
|
# SYM: Symbol table '.symtab'
|
[ELF] Simplify RelRo, TLS, NOBITS section ranks and make RW PT_LOAD start with RelRo
Old: PT_LOAD(.data | PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .bss)
New: PT_LOAD(PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .data .bss)
The placement of | indicates page alignment caused by PT_GNU_RELRO. The
new layout has simpler rules and saves space for many cases.
Old size: roundup(.data) + roundup(.data.rel.ro)
New size: roundup(.data.rel.ro + .bss.rel.ro) + .data
Other advantages:
* At runtime the 3 memory mappings decrease to 2.
* start(PT_TLS) = start(PT_GNU_RELRO) = start(RW PT_LOAD). This
simplifies binary manipulation tools.
GNU strip before 2.31 discards PT_GNU_RELRO if its
address is not equal to the start of its associated PT_LOAD.
This has been fixed by https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f2731e0c374e5323ce4cdae2bcc7b7fe22da1a6f
But with this change, we will be compatible with GNU strip before 2.31
* Before, .got.plt (non-relro by default) was placed before .got (relro
by default), which made it impossible to have _GLOBAL_OFFSET_TABLE_
(start of .got.plt on x86-64) equal to the end of .got (R_GOT*_FROM_END)
(https://bugs.llvm.org/show_bug.cgi?id=36555). With the new ordering, we
can improve on this regard if we'd like to.
Reviewers: ruiu, espindola, pcc
Subscribers: emaste, arichardson, llvm-commits, joerg, jdoerfert
Differential Revision: https://reviews.llvm.org/D56828
llvm-svn: 356117
2019-03-14 11:47:45 +08:00
|
|
|
# SYM: 0000000000030004 0 NOTYPE LOCAL DEFAULT 6 patatino
|
2017-09-21 07:49:50 +08:00
|
|
|
|
|
|
|
|
ldr x8, patatino
|
|
|
|
|
.data
|
|
|
|
|
.zero 4
|
|
|
|
|
patatino:
|