[coreboot-gerrit] New patch to review for coreboot: rmodtool: make rmodule parameter section optional

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11523

-gerrit

commit 6a7b810eb774ecc72ad7ff341106f443f88707e8
Author: Aaron Durbin 
Date:   Sun Sep 6 10:39:10 2015 -0500

rmodtool: make rmodule parameter section optional

There are currently 2 uses for rmodule programs: stand alone
    programs that are separate from the coreboot stages and a
    relocatable ramstage. For the ramstage usage there's no reason
    to require a rmodule parameter section. Therefore make this
    optional.

BUG=chrome-os-partner:44827
    BRANCH=None
    TEST=Built ramstage w/ normal linking (w/o a rmodule parameter
         section). No error.

Change-Id: I5f8a415e86510be9409a28068e3d3a4d0ba8733e
    Signed-off-by: Aaron Durbin 
---
 util/cbfstool/rmodule.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/util/cbfstool/rmodule.c b/util/cbfstool/rmodule.c
index c35eff7..1f41d17 100644
--- a/util/cbfstool/rmodule.c
+++ b/util/cbfstool/rmodule.c
@@ -344,7 +344,7 @@ static int collect_relocations(struct rmod_context *ctx)

static int
 populate_sym(struct rmod_context *ctx, const char *sym_name, Elf64_Addr *addr,
-             int nsyms, const char *strtab)
+             int nsyms, const char *strtab, int optional)
 {
    int i;
    Elf64_Sym *syms;
@@ -360,6 +360,13 @@ populate_sym(struct rmod_context *ctx, const char *sym_name, Elf64_Addr *addr,
    	*addr = syms[i].st_value;
    	return 0;
    }
+
+	if (optional) {
+		DEBUG("optional symbol '%s' not found.\n", sym_name);
+		*addr = 0;
+		return 0;
+	}
+
    ERROR("symbol '%s' not found.\n", sym_name);
    return -1;
 }
@@ -403,17 +410,17 @@ static int populate_program_info(struct rmod_context *ctx)
    }

if (populate_sym(ctx, "_rmodule_params", &ctx->parameters_begin,
-	                 nsyms, strtab))
+	                 nsyms, strtab, 1))
    	return -1;

if (populate_sym(ctx, "_ermodule_params", &ctx->parameters_end,
-	                 nsyms, strtab))
+	                 nsyms, strtab, 1))
    	return -1;

-	if (populate_sym(ctx, "_bss", &ctx->bss_begin, nsyms, strtab))
+	if (populate_sym(ctx, "_bss", &ctx->bss_begin, nsyms, strtab, 0))
    	return -1;

-	if (populate_sym(ctx, "_ebss", &ctx->bss_end, nsyms, strtab))
+	if (populate_sym(ctx, "_ebss", &ctx->bss_end, nsyms, strtab, 0))
    	return -1;

/* Honor the entry point within the ELF header. */