2016-04-06 05:27:30 +08:00
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// REQUIRES: x86
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// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t
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2018-02-06 03:39:04 +08:00
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// RUN: ld.lld %t -o %t2 -shared --apply-dynamic-relocs
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2019-05-01 13:49:01 +08:00
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// RUN: llvm-readobj -S --section-data -r %t2 | FileCheck -check-prefix CHECK -check-prefix APPLYDYNREL %s
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2016-04-13 06:08:23 +08:00
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2018-02-06 03:39:04 +08:00
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// RUN: ld.lld %t -o %t2 -shared
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2019-05-01 13:49:01 +08:00
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// RUN: llvm-readobj -S --section-data -r %t2 | FileCheck -check-prefix CHECK -check-prefix NOAPPLYDYNREL %s
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2018-02-05 18:15:08 +08:00
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// RUN: ld.lld %t -o %t2 -shared --no-apply-dynamic-relocs
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2019-05-01 13:49:01 +08:00
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// RUN: llvm-readobj -S --section-data -r %t2 | FileCheck -check-prefix CHECK -check-prefix NOAPPLYDYNREL %s
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2018-02-05 18:15:08 +08:00
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// APPLYDYNREL: Name: .data
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// APPLYDYNREL-NEXT: Type: SHT_PROGBITS
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// APPLYDYNREL-NEXT: Flags [
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// APPLYDYNREL-NEXT: SHF_ALLOC
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// APPLYDYNREL-NEXT: SHF_WRITE
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// APPLYDYNREL-NEXT: ]
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[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
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// APPLYDYNREL-NEXT: Address: 0x2000
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// APPLYDYNREL-NEXT: Offset: 0x2000
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2018-02-05 18:15:08 +08:00
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// APPLYDYNREL-NEXT: Size: 16
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// APPLYDYNREL-NEXT: Link: 0
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// APPLYDYNREL-NEXT: Info: 0
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// APPLYDYNREL-NEXT: AddressAlignment: 1
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// APPLYDYNREL-NEXT: EntrySize: 0
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// APPLYDYNREL-NEXT: SectionData (
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[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
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// APPLYDYNREL-NEXT: 0000: 00200000 00000000 00000000 00000000
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2018-02-05 18:15:08 +08:00
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// APPLYDYNREL-NEXT: )
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// NOAPPLYDYNREL: Name: .data
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// NOAPPLYDYNREL-NEXT: Type: SHT_PROGBITS
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// NOAPPLYDYNREL-NEXT: Flags [
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// NOAPPLYDYNREL-NEXT: SHF_ALLOC
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// NOAPPLYDYNREL-NEXT: SHF_WRITE
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// NOAPPLYDYNREL-NEXT: ]
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[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
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// NOAPPLYDYNREL-NEXT: Address: 0x2000
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// NOAPPLYDYNREL-NEXT: Offset: 0x2000
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2018-02-05 18:15:08 +08:00
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// NOAPPLYDYNREL-NEXT: Size: 16
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// NOAPPLYDYNREL-NEXT: Link: 0
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// NOAPPLYDYNREL-NEXT: Info: 0
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// NOAPPLYDYNREL-NEXT: AddressAlignment: 1
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// NOAPPLYDYNREL-NEXT: EntrySize: 0
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// NOAPPLYDYNREL-NEXT: SectionData (
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// NOAPPLYDYNREL-NEXT: 0000: 00000000 00000000 00000000 00000000
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// NOAPPLYDYNREL-NEXT: )
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2016-04-06 05:27:30 +08:00
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// CHECK: Name: foo
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// CHECK-NEXT: Type: SHT_PROGBITS
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: 0x0
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// CHECK-NEXT: Offset:
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2016-04-29 11:21:08 +08:00
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// CHECK-NEXT: Size: 32
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2016-04-06 05:27:30 +08:00
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// CHECK-NEXT: Link: 0
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 1
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// CHECK-NEXT: EntrySize: 0
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// CHECK-NEXT: SectionData (
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[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
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// CHECK-NEXT: 0000: 00200000 00000000 00200000 00000000
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// CHECK-NEXT: 0010: 00200000 00000000 00200000 00000000
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2016-04-06 05:27:30 +08:00
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// CHECK-NEXT: )
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2016-04-13 06:08:23 +08:00
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// CHECK: Relocations [
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// CHECK-NEXT: Section ({{.}}) .rela.dyn {
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[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
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// CHECK-NEXT: 0x2000 R_X86_64_RELATIVE - 0x2000
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// CHECK-NEXT: 0x2008 R_X86_64_64 zed 0x0
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2016-04-13 06:08:23 +08:00
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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2016-04-30 08:49:10 +08:00
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.data
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2016-04-13 06:08:23 +08:00
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.global zed
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zed:
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bar:
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.quad bar
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.quad zed
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2016-04-06 05:27:30 +08:00
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.section foo
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2016-04-13 06:08:23 +08:00
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.quad bar
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.quad zed
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2016-04-29 11:21:08 +08:00
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.section foo
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.quad bar
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.quad zed
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