build: communicate correct page size to linker

This change communicates the common and maximum page sizes to the
linker, which allows us to use the built-in constants that it provides
to deal with page alignments.

We only support 4K pages today so the fact these are fixed is not too
much of an issue, but we will need to revisit this if we ever support
other page sizes.

Change-Id: I3358c51e70df794025ddf25209ae0e2a96550b0e
Signed-off-by: Chris Kay <chris.kay@arm.com>

Makefile

@@ -456,6 +456,10 @@ else ifneq ($(findstring gcc,$(notdir $(LD))),)
 # Pass ld options with Wl or Xlinker switches
 TF_LDFLAGS		+=	-Wl,--fatal-warnings -O1
 TF_LDFLAGS		+=	-Wl,--gc-sections
+
+TF_LDFLAGS		+=	-Wl,-z,common-page-size=4096 # Configure page size constants
+TF_LDFLAGS		+=	-Wl,-z,max-page-size=4096
+
 ifeq ($(ENABLE_LTO),1)
 	ifeq (${ARCH},aarch64)
 		TF_LDFLAGS	+=	-flto -fuse-linker-plugin
@@ -473,6 +477,10 @@ TF_LDFLAGS		+=	$(subst --,-Xlinker --,$(TF_LDFLAGS_$(ARCH)))
 else
 TF_LDFLAGS		+=	-O1
 TF_LDFLAGS		+=	--gc-sections
+
+TF_LDFLAGS		+=	-z common-page-size=4096 # Configure page size constants
+TF_LDFLAGS		+=	-z max-page-size=4096
+
 # ld.lld doesn't recognize the errata flags,
 # therefore don't add those in that case.
 # ld.lld reports section type mismatch warnings,