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llvm-project/lld/test/ELF/partition-synthetic-sections.s

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ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// Test that synthetic sections are created correctly for each partition.
// REQUIRES: x86
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %S/Inputs/verneed1.s -o %t1.o
// RUN: echo "v1 {}; v2 {}; v3 { local: *; };" > %t1.script
[ELF] Add -z separate-code and pad the last page of last PF_X PT_LOAD with traps only if -z separate-code is specified This patch 1) adds -z separate-code and -z noseparate-code (default). 2) changes the condition that the last page of last PF_X PT_LOAD is padded with trap instructions. Current condition (after D33630): if there is no `SECTIONS` commands. After this change: if -z separate-code is specified. -z separate-code was introduced to ld.bfd in 2018, to place the text segment in its own pages. There is no overlap in pages between an executable segment and a non-executable segment: 1) RX cannot load initial contents from R or RW(or non-SHF_ALLOC). 2) R and RW(or non-SHF_ALLOC) cannot load initial contents from RX. lld's current status: - Between R and RX: in `Writer<ELFT>::fixSectionAlignments()`, the start of a segment is always aligned to maxPageSize, so the initial contents loaded by R and RX do not overlap. I plan to allow overlaps in D64906 if -z noseparate-code is in effect. - Between RX and RW(or non-SHF_ALLOC if RW doesn't exist): we currently unconditionally pad the last page to commonPageSize (defaults to 4096 on all targets we support). This patch will make it effective only if -z separate-code is specified. -z separate-code is a dubious feature that intends to reduce the number of ROP gadgets (which is actually ineffective because attackers can find plenty of gadgets in the text segment, no need to find gadgets in non-code regions). With the overlapping PT_LOAD technique D64906, -z noseparate-code removes two more alignments at segment boundaries than -z separate-code. This saves at most defaultCommonPageSize*2 bytes, which are significant on targets with large defaultCommonPageSize (AArch64/MIPS/PPC: 65536). Issues/feedback on alignment at segment boundaries to help understand the implication: * binutils PR24490 (the situation on ld.bfd is worse because they have two R-- on both sides of R-E so more alignments.) * In binutils, the 2018-02-27 commit "ld: Add --enable-separate-code" made -z separate-code the default on Linux. https://github.com/richfelker/musl-cross-make/commit/d969dea983a2cc54a1e0308a0cdeb6c3307e4bfa In musl-cross-make, binutils is configured with --disable-separate-code to address size regressions caused by -z separate-code. (lld actually has the same issue, which I plan to fix in a future patch. The ld.bfd x86 status is worse because they default to max-page-size=0x200000). * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237676 people want smaller code size. This patch will remove one alignment boundary. * Stef O'Rear: I'm opposed to any kind of page alignment at the text/rodata line (having a partial page of text aliased as rodata and vice versa has no demonstrable harm, and I actually care about small systems). So, make -z noseparate-code the default. Reviewed By: ruiu Differential Revision: https://reviews.llvm.org/D64903 llvm-svn: 367537
2019-08-01 17:58:25 +08:00
// RUN: ld.lld -shared %t1.o --version-script %t1.script -o %t1.so -soname verneed1.so.0 -z separate-code
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// RUN: llvm-mc %s -o %t.o -filetype=obj --triple=x86_64-unknown-linux
// RUN: echo "x1 { global: p0; }; x2 { global: p1; p1alias; };" > %t.script
[ELF] Add -z separate-code and pad the last page of last PF_X PT_LOAD with traps only if -z separate-code is specified This patch 1) adds -z separate-code and -z noseparate-code (default). 2) changes the condition that the last page of last PF_X PT_LOAD is padded with trap instructions. Current condition (after D33630): if there is no `SECTIONS` commands. After this change: if -z separate-code is specified. -z separate-code was introduced to ld.bfd in 2018, to place the text segment in its own pages. There is no overlap in pages between an executable segment and a non-executable segment: 1) RX cannot load initial contents from R or RW(or non-SHF_ALLOC). 2) R and RW(or non-SHF_ALLOC) cannot load initial contents from RX. lld's current status: - Between R and RX: in `Writer<ELFT>::fixSectionAlignments()`, the start of a segment is always aligned to maxPageSize, so the initial contents loaded by R and RX do not overlap. I plan to allow overlaps in D64906 if -z noseparate-code is in effect. - Between RX and RW(or non-SHF_ALLOC if RW doesn't exist): we currently unconditionally pad the last page to commonPageSize (defaults to 4096 on all targets we support). This patch will make it effective only if -z separate-code is specified. -z separate-code is a dubious feature that intends to reduce the number of ROP gadgets (which is actually ineffective because attackers can find plenty of gadgets in the text segment, no need to find gadgets in non-code regions). With the overlapping PT_LOAD technique D64906, -z noseparate-code removes two more alignments at segment boundaries than -z separate-code. This saves at most defaultCommonPageSize*2 bytes, which are significant on targets with large defaultCommonPageSize (AArch64/MIPS/PPC: 65536). Issues/feedback on alignment at segment boundaries to help understand the implication: * binutils PR24490 (the situation on ld.bfd is worse because they have two R-- on both sides of R-E so more alignments.) * In binutils, the 2018-02-27 commit "ld: Add --enable-separate-code" made -z separate-code the default on Linux. https://github.com/richfelker/musl-cross-make/commit/d969dea983a2cc54a1e0308a0cdeb6c3307e4bfa In musl-cross-make, binutils is configured with --disable-separate-code to address size regressions caused by -z separate-code. (lld actually has the same issue, which I plan to fix in a future patch. The ld.bfd x86 status is worse because they default to max-page-size=0x200000). * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237676 people want smaller code size. This patch will remove one alignment boundary. * Stef O'Rear: I'm opposed to any kind of page alignment at the text/rodata line (having a partial page of text aliased as rodata and vice versa has no demonstrable harm, and I actually care about small systems). So, make -z noseparate-code the default. Reviewed By: ruiu Differential Revision: https://reviews.llvm.org/D64903 llvm-svn: 367537
2019-08-01 17:58:25 +08:00
// RUN: ld.lld %t.o %t1.so --version-script %t.script -o %t --shared --gc-sections --eh-frame-hdr -soname main.so -z separate-code
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// RUN: llvm-objcopy --extract-main-partition %t %t0
// RUN: llvm-objcopy --extract-partition=part1 %t %t1
// RUN: llvm-readelf --all --unwind %t0 | FileCheck --check-prefixes=CHECK,PART0 %s
// RUN: llvm-readelf --all --unwind %t1 | FileCheck --check-prefixes=CHECK,PART1 %s
// FIXME: llvm-objcopy does not preserve padding (see pr42145) so for now we
// check the combined output file.
// RUN: od -Ax -x %t | FileCheck %s -check-prefix=FILL
// RUN: llvm-objdump -s -j .rodata -j .dynstr %t0 | FileCheck --check-prefix=PART-INDEX %s
// CHECK: Section Headers:
// CHECK-NEXT: Name
// CHECK-NEXT: NULL
// CHECK-NEXT: .dynsym DYNSYM {{0*}}[[DYNSYM_ADDR:[^ ]*]]
// CHECK-NEXT: .gnu.version VERSYM {{0*}}[[VERSYM_ADDR:[^ ]*]]
// CHECK-NEXT: .gnu.version_d VERDEF {{0*}}[[VERDEF_ADDR:[^ ]*]]
// CHECK-NEXT: .gnu.version_r VERNEED {{0*}}[[VERNEED_ADDR:[^ ]*]]
// CHECK-NEXT: .gnu.hash GNU_HASH {{0*}}[[GNU_HASH_ADDR:[^ ]*]]
// CHECK-NEXT: .hash HASH {{0*}}[[HASH_ADDR:[^ ]*]]
// CHECK-NEXT: .dynstr STRTAB {{0*}}[[DYNSTR_ADDR:[^ ]*]]
// CHECK-NEXT: .rela.dyn RELA {{0*}}[[RELA_DYN_ADDR:[^ ]*]]
// PART0-NEXT: .rela.plt RELA {{0*}}[[RELA_PLT_ADDR:[^ ]*]]
// CHECK-NEXT: .eh_frame_hdr PROGBITS {{0*}}[[EH_FRAME_HDR_ADDR:[^ ]*]]
// CHECK-NEXT: .eh_frame PROGBITS {{0*}}[[EH_FRAME_ADDR:[^ ]*]]
// PART0-NEXT: .rodata PROGBITS
// CHECK-NEXT: .text PROGBITS {{0*}}[[TEXT_ADDR:[^ ]*]]
// PART0-NEXT: .plt PROGBITS
// PART0-NEXT: .init_array INIT_ARRAY {{0*}}[[INIT_ARRAY_ADDR:[^ ]*]]
// CHECK-NEXT: .dynamic DYNAMIC {{0*}}[[DYNAMIC_ADDR:[^ ]*]]
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// PART0-NEXT: .data PROGBITS 000000000000[[DATA_SEGMENT:.]]178
// PART1-NEXT: .data PROGBITS 000000000000[[DATA_SEGMENT:.]]130
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// PART0-NEXT: .got.plt PROGBITS {{0*}}[[GOT_PLT_ADDR:[^ ]*]]
// PART0-NEXT: .part.end NOBITS {{0*}}[[PART_END_ADDR:[^ ]*]]
// CHECK-NEXT: .comment PROGBITS
// CHECK-NEXT: .symtab SYMTAB
// CHECK-NEXT: .shstrtab STRTAB
// CHECK-NEXT: .strtab STRTAB
// CHECK-NEXT: Key to Flags
[llvm-readelf] Make --all output order closer to GNU readelf https://bugs.llvm.org/show_bug.cgi?id=43403 The new order makes it easy to compare the two tools' --all. Reviewed By: grimar, rupprecht Differential Revision: https://reviews.llvm.org/D75592
2020-03-04 11:49:14 +08:00
// CHECK: Program Headers:
// CHECK-NEXT: Type
// PART0-NEXT: PHDR {{.*}} 0x000230 0x000230 R
// PART1-NEXT: PHDR {{.*}} 0x0001f8 0x0001f8 R
// PART0-NEXT: LOAD 0x000000 0x0000000000000000 0x0000000000000000 {{.*}} R 0x1000
// PART0-NEXT: LOAD 0x001000 0x0000000000001000 0x0000000000001000 {{.*}} R E 0x1000
// PART0-NEXT: LOAD 0x002000 0x0000000000002000 0x0000000000002000 {{.*}} RW 0x1000
// PART0-NEXT: LOAD 0x002178 0x0000000000003178 0x0000000000003178 {{.*}} RW 0x1000
// PART0-NEXT: LOAD 0x003150 0x0000000000008150 0x0000000000008150 0x000000 0x001000 RW 0x1000
// PART1-NEXT: LOAD 0x000000 0x0000000000004000 0x0000000000004000 {{.*}} R 0x1000
// PART1-NEXT: LOAD 0x001000 0x0000000000005000 0x0000000000005000 {{.*}} R E 0x1000
// PART1-NEXT: LOAD 0x002000 0x0000000000006000 0x0000000000006000 {{.*}} RW 0x1000
// PART1-NEXT: LOAD 0x002130 0x0000000000007130 0x0000000000007130 {{.*}} RW 0x1000
// CHECK-NEXT: DYNAMIC {{.*}} 0x{{0*}}[[DYNAMIC_ADDR]] 0x{{0*}}[[DYNAMIC_ADDR]] {{.*}} RW 0x8
// PART0-NEXT: GNU_RELRO 0x002000 0x0000000000002000 0x0000000000002000 {{.*}} R 0x1
// PART1-NEXT: GNU_RELRO 0x002000 0x0000000000006000 0x0000000000006000 {{.*}} R 0x1
// CHECK-NEXT: GNU_EH_FRAME {{.*}} 0x{{0*}}[[EH_FRAME_HDR_ADDR]] 0x{{0*}}[[EH_FRAME_HDR_ADDR]] {{.*}} R 0x4
// CHECK-NEXT: GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0x0
// CHECK-EMPTY:
// CHECK: Dynamic section
// CHECK-NEXT: Tag
// CHECK-NEXT: 0x0000000000000001 (NEEDED) Shared library: [verneed1.so.0]
// PART0-NEXT: 0x000000000000000e (SONAME) Library soname: [main.so]
// PART1-NEXT: 0x0000000000000001 (NEEDED) Shared library: [main.so]
// PART1-NEXT: 0x000000000000000e (SONAME) Library soname: [part1]
// CHECK-NEXT: 0x0000000000000007 (RELA) 0x[[RELA_DYN_ADDR]]
// CHECK-NEXT: 0x0000000000000008 (RELASZ)
// CHECK-NEXT: 0x0000000000000009 (RELAENT) 24 (bytes)
// PART1-NEXT: 0x000000006ffffff9 (RELACOUNT) 1
// PART0-NEXT: 0x0000000000000017 (JMPREL) 0x[[RELA_PLT_ADDR]]
// PART0-NEXT: 0x0000000000000002 (PLTRELSZ) 48 (bytes)
// PART0-NEXT: 0x0000000000000003 (PLTGOT) 0x[[GOT_PLT_ADDR]]
// PART0-NEXT: 0x0000000000000014 (PLTREL) RELA
// CHECK-NEXT: 0x0000000000000006 (SYMTAB) 0x[[DYNSYM_ADDR]]
// CHECK-NEXT: 0x000000000000000b (SYMENT) 24 (bytes)
// CHECK-NEXT: 0x0000000000000005 (STRTAB) 0x[[DYNSTR_ADDR]]
// CHECK-NEXT: 0x000000000000000a (STRSZ)
// CHECK-NEXT: 0x000000006ffffef5 (GNU_HASH) 0x[[GNU_HASH_ADDR]]
// CHECK-NEXT: 0x0000000000000004 (HASH) 0x[[HASH_ADDR]]
// PART0-NEXT: 0x0000000000000019 (INIT_ARRAY) 0x[[INIT_ARRAY_ADDR]]
// PART0-NEXT: 0x000000000000001b (INIT_ARRAYSZ) 8 (bytes)
// CHECK-NEXT: 0x000000006ffffff0 (VERSYM) 0x[[VERSYM_ADDR]]
// CHECK-NEXT: 0x000000006ffffffc (VERDEF) 0x[[VERDEF_ADDR]]
// CHECK-NEXT: 0x000000006ffffffd (VERDEFNUM) 3
// CHECK-NEXT: 0x000000006ffffffe (VERNEED) 0x[[VERNEED_ADDR]]
// CHECK-NEXT: 0x000000006fffffff (VERNEEDNUM) 1
// PART0-NEXT: 0x0000000000000000 (NULL) 0x0
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// CHECK: Relocation section '.rela.dyn'
// CHECK-NEXT: Offset
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// PART0-NEXT: 000000000000[[DATA_SEGMENT]]178 {{.*}} R_X86_64_64 {{.*}} f1@v3 + 0
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// PART0-NEXT: {{0*}}[[INIT_ARRAY_ADDR]] {{.*}} R_X86_64_64 {{.*}} p0@@x1 + 0
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// PART1-NEXT: 000000000000[[DATA_SEGMENT]]148 {{.*}} R_X86_64_RELATIVE 3178
// PART1-NEXT: 000000000000[[DATA_SEGMENT]]130 {{.*}} R_X86_64_64 {{.*}} f2@v2 + 0
[libObject,llvm-readelf/obj] - Don't use @@ when printing versions of undefined symbols. A default version (@@) is only available for defined symbols. Currently we use "@@" for undefined symbols too. This patch fixes the issue and improves our test case. Differential revision: https://reviews.llvm.org/D95219
2021-01-22 17:26:42 +08:00
// PART1-NEXT: 000000000000[[DATA_SEGMENT]]138 {{.*}} R_X86_64_64 {{.*}} p0@x1 + 0
// PART1-NEXT: 000000000000[[DATA_SEGMENT]]140 {{.*}} R_X86_64_64 {{.*}} p0@x1 + 0
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// PART0: Relocation section '.rela.plt'
// PART0-NEXT: Offset
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// PART0-NEXT: 000000000000[[DATA_SEGMENT]]198 {{.*}} R_X86_64_JUMP_SLOT {{.*}} f1@v3 + 0
// PART0-NEXT: 000000000000[[DATA_SEGMENT]]1a0 {{.*}} R_X86_64_JUMP_SLOT {{.*}} f2@v2 + 0
[llvm-readelf] Make --all output order closer to GNU readelf https://bugs.llvm.org/show_bug.cgi?id=43403 The new order makes it easy to compare the two tools' --all. Reviewed By: grimar, rupprecht Differential Revision: https://reviews.llvm.org/D75592
2020-03-04 11:49:14 +08:00
// CHECK-NEXT: EHFrameHeader
// CHECK: Address: 0x[[EH_FRAME_HDR_ADDR]]
// CHECK: eh_frame_ptr: 0x[[EH_FRAME_ADDR]]
// CHECK: initial_location: 0x[[TEXT_ADDR]]
// CHECK: address: 0x[[FDE_ADDR:.*]]
// CHECK: .eh_frame section
// CHECK: 0x[[EH_FRAME_ADDR]]] CIE length=20
// CHECK-NOT: FDE
// CHECK: 0x[[FDE_ADDR]]] FDE length=20 cie={{.}}0x[[EH_FRAME_ADDR]]
// CHECK-NEXT: initial_location: 0x[[TEXT_ADDR]]
// CHECK-NOT: FDE
// CHECK: CIE length=0
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// CHECK: Symbol table '.dynsym'
// PART0: 1: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND f1@v3
// PART0: 2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND f2@v2
// PART0: 3: {{0*}}[[TEXT_ADDR]] 0 NOTYPE GLOBAL DEFAULT {{.*}} p0@@x1
// PART1: 1: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND f2@v2
[libObject,llvm-readelf/obj] - Don't use @@ when printing versions of undefined symbols. A default version (@@) is only available for defined symbols. Currently we use "@@" for undefined symbols too. This patch fixes the issue and improves our test case. Differential revision: https://reviews.llvm.org/D95219
2021-01-22 17:26:42 +08:00
// PART1: 2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND p0@x1
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// PART1: 3: {{0*}}[[TEXT_ADDR]] 0 NOTYPE GLOBAL DEFAULT {{.*}} p1@@x2
// PART1: 4: {{0*}}[[TEXT_ADDR]] 0 NOTYPE GLOBAL DEFAULT {{.*}} p1alias@@x2
// CHECK-EMPTY:
// PART0: Symbol table '.symtab'
// PART0: 000000000000048c 0 NOTYPE LOCAL HIDDEN {{.*}} __part_index_begin
// PART0: 0000000000000498 0 NOTYPE LOCAL HIDDEN {{.*}} __part_index_end
// PART-INDEX: Contents of section .dynstr:
ELFObjectWriter: Don't sort non-local symbols As we don't sort local symbols, don't sort non-local symbols. This makes non-local symbols appear in their register order, which matches GNU as. The register order is nice in that you can write tests with interleaved CHECK prefixes, e.g. ``` // CHECK: something about foo .globl foo foo: // CHECK: something about bar .globl bar bar: ``` With the lexicographical order, the user needs to place lexicographical smallest symbol first or keep CHECK prefixes in one place.
2021-02-14 02:32:27 +08:00
// PART-INDEX-NEXT: 03a8 00703000 66310066 32007061 72743100 .p0.f1.f2.part1.
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// PART-INDEX: Contents of section .rodata:
// 0x48c + 0xffffff26 = 0x3b2
// 0x490 + 0x3b70 = 0x4000
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// PART-INDEX-NEXT: 048c 26ffffff 703b0000 50410000
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// CHECK: Version symbols section '.gnu.version'
// CHECK-NEXT: Addr:
// PART0-NEXT: 000: 0 (*local*) 4 (v3) 5 (v2) 2 (x1)
// PART1-NEXT: 000: 0 (*local*) 5 (v2) 2 (x1) 3 (x2)
// CHECK: Version definition section '.gnu.version_d'
// CHECK-NEXT: Addr:
// PART0-NEXT: 0x0000: Rev: 1 Flags: BASE Index: 1 Cnt: 1 Name: main.so
// PART1-NEXT: 0x0000: Rev: 1 Flags: BASE Index: 1 Cnt: 1 Name: part1
// CHECK-NEXT: 0x001c: Rev: 1 Flags: none Index: 2 Cnt: 1 Name: x1
// CHECK-NEXT: 0x0038: Rev: 1 Flags: none Index: 3 Cnt: 1 Name: x2
// CHECK: Version needs section '.gnu.version_r'
// CHECK-NEXT: Addr:
// CHECK-NEXT: 0x0000: Version: 1 File: verneed1.so.0 Cnt: 2
// CHECK-NEXT: 0x0010: Name: v2 Flags: none Version: 5
// CHECK-NEXT: 0x0020: Name: v3 Flags: none Version: 4
// PART0: Histogram for bucket list length (total of 4 buckets)
// PART0-NEXT: Length Number % of total Coverage
// PART0-NEXT: 0 1 ( 25.0%) 0.0%
// PART0-NEXT: 1 3 ( 75.0%) 100.0%
// PART0-NEXT: Histogram for `.gnu.hash' bucket list length (total of 1 buckets)
// PART0-NEXT: Length Number % of total Coverage
// PART0-NEXT: 0 0 ( 0.0%) 0.0%
// PART0-NEXT: 1 1 (100.0%) 100.0%
// PART1: Histogram for bucket list length (total of 5 buckets)
// PART1-NEXT: Length Number % of total Coverage
// PART1-NEXT: 0 3 ( 60.0%) 0.0%
// PART1-NEXT: 1 2 ( 40.0%) 100.0%
// PART1-NEXT: Histogram for `.gnu.hash' bucket list length (total of 1 buckets)
// PART1-NEXT: Length Number % of total Coverage
// PART1-NEXT: 0 0 ( 0.0%) 0.0%
// PART1-NEXT: 1 0 ( 0.0%) 0.0%
// PART1-NEXT: 2 1 (100.0%) 100.0%
// FILL: 001040 cccc cccc cccc cccc cccc cccc cccc cccc
// FILL-NEXT: *
// FILL-NEXT: 002000
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// FILL: 004010 cccc cccc cccc cccc cccc cccc cccc cccc
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
// FILL-NEXT: *
[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64 Port the D64906 technique to EM_X86_64. Differential Revision: https://reviews.llvm.org/D67482 llvm-svn: 371958
2019-09-16 15:05:34 +08:00
// FILL-NEXT: 005000
ELF: Create synthetic sections for loadable partitions. We create several types of synthetic sections for loadable partitions, including: - The dynamic symbol table. This allows code outside of the loadable partitions to find entry points with dlsym. - Creating a dynamic symbol table also requires the creation of several other synthetic sections for the partition, such as the dynamic table and hash table sections. - The partition's ELF header is represented as a synthetic section in the combined output file, and will be used by llvm-objcopy to extract partitions. Differential Revision: https://reviews.llvm.org/D62350 llvm-svn: 362819
2019-06-08 01:57:58 +08:00
.section .llvm_sympart,"",@llvm_sympart
.asciz "part1"
.quad p1
.section .llvm_sympart2,"",@llvm_sympart
.asciz "part1"
.quad p1alias
.section .text.p0,"ax",@progbits
.globl p0
p0:
.cfi_startproc
lea d0(%rip), %rax
call f1
ret
.cfi_endproc
.section .data.d0,"aw",@progbits
d0:
.quad f1
.section .text.p1,"ax",@progbits
.globl p1
p1:
.globl p1alias
p1alias:
.cfi_startproc
lea d1(%rip), %rax
call f2
ret
.cfi_endproc
.section .data.d1,"aw",@progbits
d1:
.quad f2
.quad p0
.quad p0
.quad d0
.section .init_array,"aw",@init_array
.quad p0
.globl __part_index_begin
.globl __part_index_end