Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9222
-gerrit
commit bd7604841b4f7eedd733ede19d5358dbc03e6095 Author: Julius Werner jwerner@chromium.org Date: Tue Sep 23 20:53:20 2014 -0700
arm: Prevent compilation of old, experimental SMP support
The ARM SMP feature was added a long time ago and has never really been used by anyone since. We are still always compiling cpu_info() even though we don't use it, and it makes some dangerous assumptions about stack alignment that are not guaranteed anywhere.
I'm planning to change the way the stack boundaries are defined. Rather than trying to work that into this unsafe, unused and hard to test feature, I think we should just seal it off with police tape and make sure that if anyone ever tries to use it again (which currently seems unlikely), they get forced to do their due diligence on making sure it works as intended.
BUG=None TEST=Compiled Veyron_Pinky.
Change-Id: Id25545cab88f29200c7672ef02c7804f0ac26399 Signed-off-by: Stefan Reinauer reinauer@chromium.org Original-Commit-Id: 5b517fc46b030a6e50ef2f5e4d4a449b98ce16c6 Original-Change-Id: I8a60bd30e8b27a22bb3da68ca84daea99424dee9 Original-Signed-off-by: Julius Werner jwerner@chromium.org Original-Reviewed-on: https://chromium-review.googlesource.com/219680 Original-Reviewed-by: Aaron Durbin adurbin@chromium.org Original-Reviewed-by: David Hendricks dhendrix@chromium.org --- src/arch/arm/Makefile.inc | 2 +- src/arch/arm/cpu.c | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/arch/arm/Makefile.inc b/src/arch/arm/Makefile.inc index 25f764c..e739d0b 100644 --- a/src/arch/arm/Makefile.inc +++ b/src/arch/arm/Makefile.inc @@ -117,7 +117,7 @@ ifeq ($(CONFIG_ARCH_RAMSTAGE_ARM),y)
ramstage-y += stages.c ramstage-y += div0.c -ramstage-y += cpu.c +ramstage-$(CONFIG_COOP_MULTITASKING) += cpu.c ramstage-y += eabi_compat.c ramstage-y += boot.c ramstage-y += tables.c diff --git a/src/arch/arm/cpu.c b/src/arch/arm/cpu.c index f90c759..e02fed3 100644 --- a/src/arch/arm/cpu.c +++ b/src/arch/arm/cpu.c @@ -34,6 +34,11 @@ */ struct cpu_info *cpu_info(void) { +#error "This is BROKEN! ARM stacks are currently not guaranteed to be " \ + "STACK_SIZE-aligned in any way. If you ever plan to revive this " \ + "feature, make sure you add the proper assertions " \ + "(and maybe consider revising the whole thing to work closer to what " \ + "arm64 is doing now)." uintptr_t addr = ALIGN((uintptr_t)__builtin_frame_address(0), CONFIG_STACK_SIZE); addr -= sizeof(struct cpu_info);