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llvm-project/lld/test/ELF/mips-gprel32-relocs.s

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[ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations The R_MIPS_GPREL16 / R_MIPS_GPREL32 relocations use the following expressions for calculations: ``` local symbol: S + A + GP0 - GP global symbol: S + A - GP GP - Represents the final gp value, i.e. _gp symbol GP0 - Represents the gp value used to create the relocatable object ``` The GP0 value is taken from the .reginfo data section defined by an object file. To implement that I keep a reference to `MipsReginfoInputSection` in the `ObjectFile` class. This reference is used by the `ObjectFile::getMipsGp0` method to return the GP0 value. Differential Revision: http://reviews.llvm.org/D15760 llvm-svn: 256416
2015-12-25 21:02:13 +08:00
# Check R_MIPS_GPREL32 relocation calculation.
# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o %t.o
# RUN: ld.lld -shared -o %t.so %t.o
# RUN: llvm-objdump -s -section=.rodata -t %t.so | FileCheck %s
# REQUIRES: mips
.text
.globl __start
__start:
lw $t0,%call16(__start)($gp)
foo:
nop
bar:
nop
.section .rodata, "a"
v1:
.gpword foo
.gpword bar
# CHECK: Contents of section .rodata:
[ELF][MIPS] Exclude mips .got from PT_GNU_RELRO segment On MIPS .got section cannot be included into the PT_GNU_RELRO segment. Sometimes it might work, but in general it is unsupported. One of the problem is that all sections marked by SHF_MIPS_GPREL should be grouped together because data in these sections is addressable with a gp relative address, but such sections might be writable. This patch exclude mips .got from PT_GNU_RELRO segment and group SHF_MIPS_GPREL sections. llvm-svn: 292161
2017-01-17 05:17:23 +08:00
# CHECK: 00f4 fffe8014 fffe8018
[ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations The R_MIPS_GPREL16 / R_MIPS_GPREL32 relocations use the following expressions for calculations: ``` local symbol: S + A + GP0 - GP global symbol: S + A - GP GP - Represents the final gp value, i.e. _gp symbol GP0 - Represents the gp value used to create the relocatable object ``` The GP0 value is taken from the .reginfo data section defined by an object file. To implement that I keep a reference to `MipsReginfoInputSection` in the `ObjectFile` class. This reference is used by the `ObjectFile::getMipsGp0` method to return the GP0 value. Differential Revision: http://reviews.llvm.org/D15760 llvm-svn: 256416
2015-12-25 21:02:13 +08:00
# ^ 0x10004 - 0x27ff0
# ^ 0x10008 - 0x27ff0
# CHECK: SYMBOL TABLE:
# CHECK: 00010008 .text 00000000 bar
# CHECK: 00010004 .text 00000000 foo
[ELF][MIPS] Make _gp, _gp_disp, __gnu_local_gp global symbols These MIPS specific symbols should be global because in general they can have an arbitrary value. By default this value is a fixed offset from .got section. This patch adds more checks to the mips-gp-local.s test case but marks it as XFAIL because LLD does not allow redefinition of absolute symbols value by a linker script. This should be fixed by D27276. Differential revision: https://reviews.llvm.org/D27524 llvm-svn: 289025
2016-12-08 14:19:47 +08:00
# CHECK: 00027ff0 *ABS* 00000000 .hidden _gp