From a8601c3f0da98f7179288be1a9a2950aad5b2f5f Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Wed, 13 May 2020 12:10:13 +0100 Subject: aarch64: fix pac-ret support in _mcount Currently gcc -pg -mbranch-protection=pac-ret passes signed return address to _mcount, so _mcount now has to always strip pac from the frompc since that's from user code that may be built with pac-ret. This is gcc PR target/94791: signed pointers should not escape and get passed across extern call boundaries, since that's an ABI break, but because existing gcc has this issue we work it around in glibc until that is resolved. This is compatible with a fixed gcc and it is a nop on systems without PAuth support. The bug was introduced in gcc-7 with -msign-return-address=non-leaf|all support which in gcc-9 got renamed to -mbranch-protection=pac-ret|pac-ret+leaf|standard. strip_pac uses inline asm instead of __builtin_aarch64_xpaclri since that is not a documented api and not available in all supported gccs. Reviewed-by: Adhemerval Zanella --- sysdeps/aarch64/machine-gmon.h | 3 ++- sysdeps/aarch64/sysdep.h | 11 +++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/sysdeps/aarch64/machine-gmon.h b/sysdeps/aarch64/machine-gmon.h index 730a23b..a687298 100644 --- a/sysdeps/aarch64/machine-gmon.h +++ b/sysdeps/aarch64/machine-gmon.h @@ -27,8 +27,9 @@ 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) +/* Note: strip_pac is needed for frompc because of gcc PR target/94791. */ #define MCOUNT \ void __mcount (void *frompc) \ { \ - mcount_internal ((u_long) frompc, (u_long) RETURN_ADDRESS (0)); \ + mcount_internal ((u_long) strip_pac (frompc), (u_long) RETURN_ADDRESS (0)); \ } diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h index cd88023..f442506 100644 --- a/sysdeps/aarch64/sysdep.h +++ b/sysdeps/aarch64/sysdep.h @@ -35,6 +35,17 @@ #define PTR_SIZE (1<