From 9fa35dbb901b11d31a897cc88c9258e7cd35b899 Mon Sep 17 00:00:00 2001 From: Alexandre Oliva Date: Thu, 14 Dec 2023 03:21:37 -0300 Subject: strub: sparc: omit frame in strub_leave [PR112917] If we allow __strub_leave to allocate a frame on sparc, it will overlap with a lot of the stack range we're supposed to scrub, because of the large fixed-size outgoing args and register save area. Unfortunately, setting up the PIC register seems to prevent the frame pointer from being omitted. Since the strub runtime doesn't issue calls or use global variables, at least on sparc, disabling PIC to compile strub.c seems to do the right thing. for libgcc/ChangeLog PR middle-end/112917 * config.host (sparc, sparc64): Enable... * config/sparc/t-sparc: ... this new fragment. --- libgcc/config.host | 2 ++ libgcc/config/sparc/t-sparc | 4 ++++ 2 files changed, 6 insertions(+) create mode 100644 libgcc/config/sparc/t-sparc (limited to 'libgcc') diff --git a/libgcc/config.host b/libgcc/config.host index 694e3e9..54d0697 100644 --- a/libgcc/config.host +++ b/libgcc/config.host @@ -199,9 +199,11 @@ riscv*-*-*) ;; sparc64*-*-*) cpu_type=sparc + tmake_file="${tmake_file} sparc/t-sparc" ;; sparc*-*-*) cpu_type=sparc + tmake_file="${tmake_file} sparc/t-sparc" ;; s390*-*-*) cpu_type=s390 diff --git a/libgcc/config/sparc/t-sparc b/libgcc/config/sparc/t-sparc new file mode 100644 index 0000000..fb1bf1f --- /dev/null +++ b/libgcc/config/sparc/t-sparc @@ -0,0 +1,4 @@ +# This is needed for __strub_leave to omit the frame pointer, without +# which it will allocate a register save area on the stack and leave +# it unscrubbed and most likely unused, because it's a leaf function. +CFLAGS-strub.c += -fno-PIC -fomit-frame-pointer -- cgit v1.1