diff options
| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-01-31 17:26:59 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-02-09 10:29:18 -0300 |
| commit | 80adf8399949f1890632e572d756ebf81bea94a6 (patch) | |
| tree | 270d4c39300d92aa8dde3ecd3521208b388a794e | |
| parent | 102f6424791ee49c9600898dc9312ba278a7f8c5 (diff) | |
| download | glibc-80adf8399949f1890632e572d756ebf81bea94a6.tar glibc-80adf8399949f1890632e572d756ebf81bea94a6.tar.gz glibc-80adf8399949f1890632e572d756ebf81bea94a6.tar.bz2 glibc-80adf8399949f1890632e572d756ebf81bea94a6.zip | |
aarch64: Fix gmon profiling with clang
Different than gcc, clang does not pass the LR value as the first
argument. To avoid requiring change clang generated code (since same
ABI is used on other OS, like FreeBSD), use a similar strategy as x86_64
to obtain both the frompc and the selfpc from the stack frame.
Checked on aarch64-linux-gnu.
| -rw-r--r-- | sysdeps/aarch64/Makefile | 3 | ||||
| -rw-r--r-- | sysdeps/aarch64/__mcount.S (renamed from sysdeps/aarch64/mcount.c) | 20 | ||||
| -rw-r--r-- | sysdeps/aarch64/machine-gmon.h | 12 |
3 files changed, 23 insertions, 12 deletions
diff --git a/sysdeps/aarch64/Makefile b/sysdeps/aarch64/Makefile index 141d7d9cc2..bac84c6144 100644 --- a/sysdeps/aarch64/Makefile +++ b/sysdeps/aarch64/Makefile @@ -54,6 +54,9 @@ gen-as-const-headers += \ endif ifeq ($(subdir),gmon) +sysdep_routines += \ + __mcount \ + # sysdep_routines CFLAGS-mcount.c += -mgeneral-regs-only endif diff --git a/sysdeps/aarch64/mcount.c b/sysdeps/aarch64/__mcount.S index 1651ab9c8f..9688c41459 100644 --- a/sysdeps/aarch64/mcount.c +++ b/sysdeps/aarch64/__mcount.S @@ -1,5 +1,5 @@ -/* Copyright (C) 2013-2024 Free Software Foundation, Inc. - +/* AArch64 definitions for profiling support. + Copyright (C) 2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,9 +16,23 @@ License along with the GNU C Library. If not, see <https://www.gnu.org/licenses/>. */ +#include <sysdep.h> #include <shlib-compat.h> -#include <gmon/mcount.c> +ENTRY (__mcount) + stp x29, x30, [sp, -16]! + /* Note: xpaclri is needed for frompc because of gcc PR target/94791. */ + hint 7 + mov x1, x30 + /* Load the caller return address as frompc. */ + ldr x0, [x29, #8] + mov x30, x0 + mov x0, x30 + /* Use the return address as selfpc. */ + mov x0, x30 + ldp x29, x30, [sp], 16 + b __mcount_internal +END (__mcount) /* We forgot to add _mcount in glibc 2.17. We added it in 2.18 therefore we want it to be added with version GLIBC_2_18. However, diff --git a/sysdeps/aarch64/machine-gmon.h b/sysdeps/aarch64/machine-gmon.h index 6890b9912b..a703f5ca4d 100644 --- a/sysdeps/aarch64/machine-gmon.h +++ b/sysdeps/aarch64/machine-gmon.h @@ -22,14 +22,8 @@ #include <sysdep.h> -static void mcount_internal (u_long frompc, u_long selfpc); - #define _MCOUNT_DECL(frompc, selfpc) \ -static inline void mcount_internal (u_long frompc, u_long selfpc) +void __mcount_internal (u_long frompc, u_long selfpc) -/* Note: strip_pac is needed for frompc because of gcc PR target/94791. */ -#define MCOUNT \ -void __mcount (void *frompc) \ -{ \ - mcount_internal ((u_long) strip_pac (frompc), (u_long) RETURN_ADDRESS (0)); \ -} +/* Implemented by __mcount.S. */ +#define MCOUNT |