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x86: Update the check for Forbidden global variables 

Add a section .illegal_globals to romstage and check that the section does not
contain any variables while creating romstage.

[pg: Handle individual AGESA special cases in the
linker script instead of whitelisting everything
remotely AGESA related in the Makefile.]

Change-Id: I866681f51a44bc21770d32995c281b556a90c153
Signed-off-by: Furquan Shaikh <furquan@google.com>
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7306
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Furquan Shaikh 2014-10-30 11:53:38 -07:00 committed by Patrick Georgi
parent c3d49984f6
commit 3cf6aea871
2 changed files with 18 additions and 2 deletions
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5
src/arch/x86/Makefile.inc
View File

@ -206,9 +206,10 @@ romstage-libs ?=
$(objcbfs)/romstage_null.debug: $$(romstage-objs) $(objgenerated)/romstage_null.ld $$(romstage-libs)
@printf " LINK $(subst $(obj)/,,$(@))\n"
$(LD_romstage) -nostdlib -nostartfiles -static -o $@ -L$(obj) $(COMPILER_RT_FLAGS_romstage) --start-group $(romstage-objs) $(romstage-libs) $(COMPILER_RT_romstage) --end-group -T $(objgenerated)/romstage_null.ld
$(NM_romstage) $@ | grep -q " [DdBb] "; if [ $$? -eq 0 ]; then \
$(OBJCOPY_romstage) --only-section .illegal_globals $(@) $(objcbfs)/romstage_null.offenders && \
$(NM_romstage) $(objcbfs)/romstage_null.offenders | grep -q ""; if [ $$? -eq 0 ]; then \
echo "Forbidden global variables in romstage:"; \
$(NM_romstage) $@ | grep " [DdBb] "; test "$(CONFIG_CPU_AMD_AGESA)" = y; \
$(NM_romstage) $(objcbfs)/romstage_null.offenders; false; \
else true; fi
$(objcbfs)/romstage.debug: $$(romstage-objs) $(objgenerated)/romstage.ld $$(romstage-libs)

15
src/arch/x86/init/romstage.ld
View File

@ -65,5 +65,20 @@ SECTIONS
preram_cbmem_console = .;
}
/* Global variables are not allowed in romstage
* This section is checked during stage creation to ensure
* that there are no global variables present
*/
. = 0xffffff00;
.illegal_globals . : {
*(EXCLUDE_FILE (*/libagesa.*.a: */buildOpts.romstage.o */agesawrapper.romstage.o */cpu/amd/agesa/*.romstage.o */vendorcode/amd/agesa/* */vendorcode/amd/cimx/*) .data)
*(.data.*)
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
}
_bogus = ASSERT((SIZEOF(.car.data) + CONFIG_CONSOLE_PRERAM_BUFFER_SIZE <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");
}