[PATCH 0/8] Implement assembly cortex-M PACBTI functionality
Victor Do Nascimento
victor.donascimento@arm.com
Tue Jul 5 13:58:10 GMT 2022
This patch series modifies hand-written assembly files for Arm targets,
conditionally enabling branch target identification as well as address
return signature and verification based on Armv8.1-M Pointer
Authentication [1] using ACLE feature test macros at compile-time [2].
Function prologues/epilogues reflect gcc compilation behaviour when
gcc invoked with the following flags:
"-march=armv8.1-m.main -mbranch-protection=pac-ret+leaf+bti -mthumb
-mfloat-abi=soft -fasynchronous-unwind-tables -g -O2 -S"
Regression tested on arm-none-eabi with and without MVE extension and
for Newlib and Newlib-nano.
[1]
<https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension>
[2] <https://developer.arm.com/documentation/101028/0012/5--Feature-test-macros>
Victor Do Nascimento (8):
newlib: libc: define M-profile PACBTI-enablement macros
newlib: libc: strcmp M-profile PACBTI-enablement
newlib: libc: strlen M-profile PACBTI-enablement
newlib: libc: memchr M-profile PACBTI-enablement
newlib: libc: memcpy M-profile PACBTI-enablement
newlib: libc: setjmp/longjmp M-profile PACBTI-enablement
newlib: libc: aeabi_memmove M-profile PACBTI-enablement
newlib: libc: aeabi_memset M-profile PACBTI-enablement
.../libc/machine/arm/aeabi_memmove-thumb2.S | 42 ++++++++++-
newlib/libc/machine/arm/aeabi_memset-thumb2.S | 45 +++++++++++-
newlib/libc/machine/arm/memchr.S | 49 +++++++++++--
newlib/libc/machine/arm/memcpy-armv7m.S | 73 +++++++++++++++++--
newlib/libc/machine/arm/pacbti.h | 58 +++++++++++++++
newlib/libc/machine/arm/setjmp.S | 32 +++++++-
newlib/libc/machine/arm/strcmp-arm-tiny.S | 7 +-
newlib/libc/machine/arm/strcmp-armv7.S | 45 +++++++++---
newlib/libc/machine/arm/strcmp-armv7m.S | 36 +++++++--
newlib/libc/machine/arm/strlen-armv7.S | 52 ++++++++++++-
newlib/libc/machine/arm/strlen-stub.c | 9 +++
newlib/libc/machine/arm/strlen-thumb2-Os.S | 13 +++-
12 files changed, 417 insertions(+), 44 deletions(-)
create mode 100644 newlib/libc/machine/arm/pacbti.h
--
2.36.1
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