mirror of
https://src.fedoraproject.org/rpms/llvm.git
synced 2024-11-24 09:32:42 +00:00
Fix profiling after a binutils NOTE change
Resolves: rhbz#2322754 Ref: https://github.com/llvm/llvm-project/issues/114605 Ref: https://github.com/llvm/llvm-project/pull/114907
This commit is contained in:
Josh Stone
Timm Bäder
parent
7cc769a9d3
commit
028a8240db
2 changed files with 96 additions and 1 deletions
|
|
@ -0,0 +1,86 @@
|
|||
From ccc2b792e57d632bc887b226a4e7f0a8189eab8b Mon Sep 17 00:00:00 2001
|
||||
From: Josh Stone <jistone@redhat.com>
|
||||
Date: Mon, 4 Nov 2024 16:37:49 -0800
|
||||
Subject: [PATCH] [profile] Use base+vaddr for `__llvm_write_binary_ids` note
|
||||
pointers
|
||||
|
||||
This function is always examining its own ELF headers in memory, but it
|
||||
was trying to use conditions between examining files or memory, and it
|
||||
wasn't accounting for LOAD offsets at runtime. This is especially bad if
|
||||
a loaded segment has additional padding that's not in the file offsets.
|
||||
|
||||
Now we do a first scan of the program headers to figure out the runtime
|
||||
base address based on `PT_PHDR` and/or `PT_DYNAMIC` (else assume zero),
|
||||
similar to libc's `do_start`. Then each `PT_NOTE` pointer is simply the
|
||||
base plus the segments's `pt_vaddr`, which includes LOAD offsets.
|
||||
|
||||
Fixes #114605
|
||||
---
|
||||
.../lib/profile/InstrProfilingPlatformLinux.c | 40 ++++++++-----------
|
||||
1 file changed, 16 insertions(+), 24 deletions(-)
|
||||
|
||||
diff --git a/compiler-rt/lib/profile/InstrProfilingPlatformLinux.c b/compiler-rt/lib/profile/InstrProfilingPlatformLinux.c
|
||||
index e2c06d51e0c6..c365129a0768 100644
|
||||
--- a/compiler-rt/lib/profile/InstrProfilingPlatformLinux.c
|
||||
+++ b/compiler-rt/lib/profile/InstrProfilingPlatformLinux.c
|
||||
@@ -194,41 +194,33 @@ static int WriteBinaryIds(ProfDataWriter *Writer, const ElfW(Nhdr) * Note,
|
||||
*/
|
||||
COMPILER_RT_VISIBILITY int __llvm_write_binary_ids(ProfDataWriter *Writer) {
|
||||
extern const ElfW(Ehdr) __ehdr_start __attribute__((visibility("hidden")));
|
||||
+ extern ElfW(Dyn) _DYNAMIC[] __attribute__((weak, visibility("hidden")));
|
||||
+
|
||||
const ElfW(Ehdr) *ElfHeader = &__ehdr_start;
|
||||
const ElfW(Phdr) *ProgramHeader =
|
||||
(const ElfW(Phdr) *)((uintptr_t)ElfHeader + ElfHeader->e_phoff);
|
||||
|
||||
+ /* Compute the added base address in case of position-independent code. */
|
||||
+ uintptr_t Base = 0;
|
||||
+ for (uint32_t I = 0; I < ElfHeader->e_phnum; I++) {
|
||||
+ if (ProgramHeader[I].p_type == PT_PHDR)
|
||||
+ Base = (uintptr_t)ProgramHeader - ProgramHeader[I].p_vaddr;
|
||||
+ if (ProgramHeader[I].p_type == PT_DYNAMIC && _DYNAMIC)
|
||||
+ Base = (uintptr_t)_DYNAMIC - ProgramHeader[I].p_vaddr;
|
||||
+ }
|
||||
+
|
||||
int TotalBinaryIdsSize = 0;
|
||||
- uint32_t I;
|
||||
/* Iterate through entries in the program header. */
|
||||
- for (I = 0; I < ElfHeader->e_phnum; I++) {
|
||||
+ for (uint32_t I = 0; I < ElfHeader->e_phnum; I++) {
|
||||
/* Look for the notes segment in program header entries. */
|
||||
if (ProgramHeader[I].p_type != PT_NOTE)
|
||||
continue;
|
||||
|
||||
/* There can be multiple notes segment, and examine each of them. */
|
||||
- const ElfW(Nhdr) * Note;
|
||||
- const ElfW(Nhdr) * NotesEnd;
|
||||
- /*
|
||||
- * When examining notes in file, use p_offset, which is the offset within
|
||||
- * the elf file, to find the start of notes.
|
||||
- */
|
||||
- if (ProgramHeader[I].p_memsz == 0 ||
|
||||
- ProgramHeader[I].p_memsz == ProgramHeader[I].p_filesz) {
|
||||
- Note = (const ElfW(Nhdr) *)((uintptr_t)ElfHeader +
|
||||
- ProgramHeader[I].p_offset);
|
||||
- NotesEnd = (const ElfW(Nhdr) *)((const char *)(Note) +
|
||||
- ProgramHeader[I].p_filesz);
|
||||
- } else {
|
||||
- /*
|
||||
- * When examining notes in memory, use p_vaddr, which is the address of
|
||||
- * section after loaded to memory, to find the start of notes.
|
||||
- */
|
||||
- Note =
|
||||
- (const ElfW(Nhdr) *)((uintptr_t)ElfHeader + ProgramHeader[I].p_vaddr);
|
||||
- NotesEnd =
|
||||
- (const ElfW(Nhdr) *)((const char *)(Note) + ProgramHeader[I].p_memsz);
|
||||
- }
|
||||
+ const ElfW(Nhdr) *Note =
|
||||
+ (const ElfW(Nhdr) *)(Base + ProgramHeader[I].p_vaddr);
|
||||
+ const ElfW(Nhdr) *NotesEnd =
|
||||
+ (const ElfW(Nhdr) *)((const char *)(Note) + ProgramHeader[I].p_memsz);
|
||||
|
||||
int BinaryIdsSize = WriteBinaryIds(Writer, Note, NotesEnd);
|
||||
if (TotalBinaryIdsSize == -1)
|
||||
--
|
||||
2.47.0
|
||||
|
||||
11
llvm.spec
11
llvm.spec
|
|
@ -182,7 +182,7 @@
|
|||
#region main package
|
||||
Name: %{pkg_name_llvm}
|
||||
Version: %{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}%{?llvm_snapshot_version_suffix:~%{llvm_snapshot_version_suffix}}
|
||||
Release: 2%{?dist}
|
||||
Release: 3%{?dist}
|
||||
Summary: The Low Level Virtual Machine
|
||||
|
||||
License: Apache-2.0 WITH LLVM-exception OR NCSA
|
||||
|
|
@ -277,6 +277,12 @@ Patch501: 0001-Fix-page-size-constant-on-aarch64-and-ppc64le.patch
|
|||
# Fixes RHEL-49517.
|
||||
Patch1801: 18-99273.patch
|
||||
|
||||
# Fix profiling after a binutils NOTE change.
|
||||
# https://github.com/llvm/llvm-project/pull/114907
|
||||
Patch1802: 0001-profile-Use-base-vaddr-for-__llvm_write_binary_ids-n.patch
|
||||
Patch1903: 0001-profile-Use-base-vaddr-for-__llvm_write_binary_ids-n.patch
|
||||
Patch2001: 0001-profile-Use-base-vaddr-for-__llvm_write_binary_ids-n.patch
|
||||
|
||||
%if 0%{?rhel} == 8
|
||||
%global python3_pkgversion 3.12
|
||||
%global __python3 /usr/bin/python3.12
|
||||
|
|
@ -2472,6 +2478,9 @@ fi
|
|||
|
||||
#region changelog
|
||||
%changelog
|
||||
* Mon Nov 18 2024 Josh Stone <jistone@redhat.com> - 19.1.3-3
|
||||
- Fix profiling after a binutils NOTE change (rhbz#2322754)
|
||||
|
||||
* Mon Nov 18 2024 Timm Bäder <tbaeder@redhat.com> - 19.1.3-2
|
||||
- Install i386 config files on x86_64
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue