Author: andrew
Date: Fri Apr 24 10:03:11 2020
New Revision: 360247
URL: https://svnweb.freebsd.org/changeset/base/360247
Log:
Build the arm64 loader with -ffixed-x18
This stops the compiler from using the x18 register. Some UEFI
implementations assume this will be preserved when calling the Boot
Services.
MFC after: 2 weeks
Sponsored by: Innovate UK
Modified:
head/stand/defs.mk
Modified: head/stand/defs.mk
==============================================================================
--- head/stand/defs.mk Fri Apr 24 09:32:20 2020 (r360246)
+++ head/stand/defs.mk Fri Apr 24 10:03:11 2020 (r360247)
@@ -119,7 +119,7 @@ SSP_CFLAGS=
# currently has no /boot/loader, but may soon.
CFLAGS+= -ffreestanding ${CFLAGS_NO_SIMD}
.if ${MACHINE_CPUARCH} == "aarch64"
-CFLAGS+= -mgeneral-regs-only -fPIC
+CFLAGS+= -mgeneral-regs-only -ffixed-x18 -fPIC
.elif ${MACHINE_CPUARCH} == "riscv"
CFLAGS+= -march=rv64imac -mabi=lp64
.else
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