From 5f846c8b0dea05554a48ec5ad13874cc757a886f Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Tue, 31 Mar 2020 17:32:14 +0100 Subject: aarch64: fix RTLD_START for BTI Tailcalls must use x16 or x17 for the indirect branch instruction to be compatible with code that uses BTI c at function entries. (Other forms of indirect branches can only land on BTI j.) Also added a BTI c at the ELF entry point of rtld, this is not strictly necessary since the kernel does not use indirect branch to get there, but it seems safest once building glibc itself with BTI is supported. Reviewed-by: Adhemerval Zanella --- sysdeps/aarch64/dl-machine.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h index db3335e5ad..70b9ed3925 100644 --- a/sysdeps/aarch64/dl-machine.h +++ b/sysdeps/aarch64/dl-machine.h @@ -125,6 +125,8 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) .globl _dl_start_user \n\ .type _dl_start_user, %function \n\ _start: \n\ + // bti c \n\ + hint 34 \n\ mov " PTR "0, " PTR_SP " \n\ bl _dl_start \n\ // returns user entry point in x0 \n\ @@ -178,7 +180,8 @@ _dl_start_user: \n\ adrp x0, _dl_fini \n\ add " PTR "0, " PTR "0, #:lo12:_dl_fini \n\ // jump to the user_s entry point \n\ - br x21 \n\ + mov x16, x21 \n\ + br x16 \n\ "); #define elf_machine_type_class(type) \ -- cgit 1.4.1