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llvm-project/lld/test/ELF/mips-hilo-gp-disp.s

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[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# Check R_MIPS_HI16 / LO16 relocations calculation against _gp_disp.
# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o %t1.o
# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux \
# RUN: %S/Inputs/mips-dynamic.s -o %t2.o
# RUN: ld.lld %t1.o %t2.o -o %t.exe
# RUN: llvm-objdump -d -t %t.exe | FileCheck -check-prefix=EXE %s
# RUN: ld.lld %t1.o %t2.o -shared -o %t.so
# RUN: llvm-objdump -d -t %t.so | FileCheck -check-prefix=SO %s
# REQUIRES: mips
.text
.globl __start
__start:
lui $t0,%hi(_gp_disp)
addi $t0,$t0,%lo(_gp_disp)
lw $v0,%call16(_foo)($gp)
[ELF][MIPS] Make R_MIPS_LO16 a relative relocation if it references _gp_disp symbol The _gp_disp symbol designates offset between start of function and 'gp' pointer into GOT. The following code is a typical MIPS function preamble used to setup $gp register: lui $gp, %hi(_gp_disp) addi $gp, $gp, %lo(_gp_disp) To calculate R_MIPS_HI16 / R_MIPS_LO16 relocations results we use the following formulas: %hi(_gp - P + A) %lo(_gp - P + A + 4), where _gp is a value of _gp symbol, A is addend, and P current address. The R_MIPS_LO16 relocation references _gp_disp symbol is always the second instruction. That is why we need four byte adjustments. The patch assigns R_PC type for R_MIPS_LO16 relocation and adjusts its addend by 4. That fix R_MIPS_LO16 calculation. For details see p. 4-19 at ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf Differential Revision: http://reviews.llvm.org/D19115 llvm-svn: 266368
2016-04-15 05:10:05 +08:00
bar:
lui $t0,%hi(_gp_disp)
addi $t0,$t0,%lo(_gp_disp)
[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# EXE: Disassembly of section .text:
# EXE-NEXT: __start:
ELF: Place relro sections after non-relro sections in r/w segment. This is in preparation for my next change, which will introduce a relro nobits section. That requires that relro sections appear at the end of the progbits part of the r/w segment so that the relro nobits section can appear contiguously. Because of the amount of churn required in the test suite, I'm making this change separately. llvm-svn: 291523
2017-01-10 09:21:30 +08:00
# EXE-NEXT: 20000: 3c 08 00 02 lui $8, 2
# ^-- %hi(0x47ff0-0x20000)
[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
# EXE-NEXT: 20004: 21 08 80 00 addi $8, $8, -32768
# ^-- %lo(0x38000-0x20004+4)
[ELF][MIPS] Make R_MIPS_LO16 a relative relocation if it references _gp_disp symbol The _gp_disp symbol designates offset between start of function and 'gp' pointer into GOT. The following code is a typical MIPS function preamble used to setup $gp register: lui $gp, %hi(_gp_disp) addi $gp, $gp, %lo(_gp_disp) To calculate R_MIPS_HI16 / R_MIPS_LO16 relocations results we use the following formulas: %hi(_gp - P + A) %lo(_gp - P + A + 4), where _gp is a value of _gp symbol, A is addend, and P current address. The R_MIPS_LO16 relocation references _gp_disp symbol is always the second instruction. That is why we need four byte adjustments. The patch assigns R_PC type for R_MIPS_LO16 relocation and adjusts its addend by 4. That fix R_MIPS_LO16 calculation. For details see p. 4-19 at ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf Differential Revision: http://reviews.llvm.org/D19115 llvm-svn: 266368
2016-04-15 05:10:05 +08:00
# EXE: bar:
[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
# EXE-NEXT: 2000c: 3c 08 00 01 lui $8, 1
# ^-- %hi(0x38000-0x2000c)
# EXE-NEXT: 20010: 21 08 7f f4 addi $8, $8, 32756
# ^-- %lo(0x38000-0x20010+4)
[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# EXE: SYMBOL TABLE:
[ELF][MIPS] Make R_MIPS_LO16 a relative relocation if it references _gp_disp symbol The _gp_disp symbol designates offset between start of function and 'gp' pointer into GOT. The following code is a typical MIPS function preamble used to setup $gp register: lui $gp, %hi(_gp_disp) addi $gp, $gp, %lo(_gp_disp) To calculate R_MIPS_HI16 / R_MIPS_LO16 relocations results we use the following formulas: %hi(_gp - P + A) %lo(_gp - P + A + 4), where _gp is a value of _gp symbol, A is addend, and P current address. The R_MIPS_LO16 relocation references _gp_disp symbol is always the second instruction. That is why we need four byte adjustments. The patch assigns R_PC type for R_MIPS_LO16 relocation and adjusts its addend by 4. That fix R_MIPS_LO16 calculation. For details see p. 4-19 at ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf Differential Revision: http://reviews.llvm.org/D19115 llvm-svn: 266368
2016-04-15 05:10:05 +08:00
# EXE: 0002000c .text 00000000 bar
[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
# EXE: 00038000 *ABS* 00000000 .hidden _gp
[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# EXE: 00020000 .text 00000000 __start
# SO: Disassembly of section .text:
# SO-NEXT: __start:
ELF: Place relro sections after non-relro sections in r/w segment. This is in preparation for my next change, which will introduce a relro nobits section. That requires that relro sections appear at the end of the progbits part of the r/w segment so that the relro nobits section can appear contiguously. Because of the amount of churn required in the test suite, I'm making this change separately. llvm-svn: 291523
2017-01-10 09:21:30 +08:00
# SO-NEXT: 10000: 3c 08 00 02 lui $8, 2
[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
# ^-- %hi(0x28000-0x10000)
# SO-NEXT: 10004: 21 08 80 00 addi $8, $8, -32768
# ^-- %lo(0x28000-0x10004+4)
[ELF][MIPS] Make R_MIPS_LO16 a relative relocation if it references _gp_disp symbol The _gp_disp symbol designates offset between start of function and 'gp' pointer into GOT. The following code is a typical MIPS function preamble used to setup $gp register: lui $gp, %hi(_gp_disp) addi $gp, $gp, %lo(_gp_disp) To calculate R_MIPS_HI16 / R_MIPS_LO16 relocations results we use the following formulas: %hi(_gp - P + A) %lo(_gp - P + A + 4), where _gp is a value of _gp symbol, A is addend, and P current address. The R_MIPS_LO16 relocation references _gp_disp symbol is always the second instruction. That is why we need four byte adjustments. The patch assigns R_PC type for R_MIPS_LO16 relocation and adjusts its addend by 4. That fix R_MIPS_LO16 calculation. For details see p. 4-19 at ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf Differential Revision: http://reviews.llvm.org/D19115 llvm-svn: 266368
2016-04-15 05:10:05 +08:00
# SO: bar:
[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
# SO-NEXT: 1000c: 3c 08 00 01 lui $8, 1
# ^-- %hi(0x28000-0x1000c)
# SO-NEXT: 10010: 21 08 7f f4 addi $8, $8, 32756
# ^-- %lo(0x28000-0x10010+4)
[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# SO: SYMBOL TABLE:
[ELF][MIPS] Make R_MIPS_LO16 a relative relocation if it references _gp_disp symbol The _gp_disp symbol designates offset between start of function and 'gp' pointer into GOT. The following code is a typical MIPS function preamble used to setup $gp register: lui $gp, %hi(_gp_disp) addi $gp, $gp, %lo(_gp_disp) To calculate R_MIPS_HI16 / R_MIPS_LO16 relocations results we use the following formulas: %hi(_gp - P + A) %lo(_gp - P + A + 4), where _gp is a value of _gp symbol, A is addend, and P current address. The R_MIPS_LO16 relocation references _gp_disp symbol is always the second instruction. That is why we need four byte adjustments. The patch assigns R_PC type for R_MIPS_LO16 relocation and adjusts its addend by 4. That fix R_MIPS_LO16 calculation. For details see p. 4-19 at ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf Differential Revision: http://reviews.llvm.org/D19115 llvm-svn: 266368
2016-04-15 05:10:05 +08:00
# SO: 0001000c .text 00000000 bar
[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
# SO: 00028000 *ABS* 00000000 .hidden _gp
[ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol The `_gp_disp` is a magic symbol designates offset between start of function and gp pointer into GOT. Only `R_MIPS_HI16` and `R_MIPS_LO16` relocations are permitted with `_gp_disp`. The patch adds the `_gp_disp` as an ignored symbol and adjusts symbol value before call the `relocateOne` for `R_MIPS_HI16/LO16` relocations. Differential Revision: http://reviews.llvm.org/D15480 llvm-svn: 255768
2015-12-16 22:45:09 +08:00
# SO: 00010000 .text 00000000 __start