From 63cd760776dd9cfc14525acfe7f1af02e9aa2fb8 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 13 Feb 2017 00:50:48 -0500
Subject: unit context: added symbol characteristics and DATA support.

---
 include/mdso/mdso.h             |  5 +++++
 src/driver/mdso_unit_ctx.c      | 24 ++++++++++++++++++++++--
 src/internal/mdso_driver_impl.h |  1 +
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/include/mdso/mdso.h b/include/mdso/mdso.h
index 62ec354..8c76720 100644
--- a/include/mdso/mdso.h
+++ b/include/mdso/mdso.h
@@ -40,6 +40,10 @@ extern "C" {
 #define MDSO_DRIVER_ANNOTATE_NEVER	0x2000
 #define MDSO_DRIVER_ANNOTATE_FULL	0x4000
 
+/* symbol characteristics */
+#define MDSO_SYMBOL_TYPE_CODE		0x0001
+#define MDSO_SYMBOL_TYPE_DATA		0x0002
+
 /* error flags */
 #define MDSO_ERROR_TOP_LEVEL		0x0001
 #define MDSO_ERROR_NESTED		0x0002
@@ -120,6 +124,7 @@ struct mdso_unit_ctx {
 	const struct mdso_input *	map;
 	const struct mdso_common_ctx *	cctx;
 	const char * const *		syms;
+	const int const *		stype;
 	void *				any;
 };
 
diff --git a/src/driver/mdso_unit_ctx.c b/src/driver/mdso_unit_ctx.c
index 4d068bf..01ef303 100644
--- a/src/driver/mdso_unit_ctx.c
+++ b/src/driver/mdso_unit_ctx.c
@@ -22,6 +22,9 @@ static int mdso_free_unit_ctx_impl(struct mdso_unit_ctx_impl * ctx, int status)
 		if (ctx->expsyms && ctx->expsyms->buffer)
 			free(ctx->expsyms->buffer);
 
+		if (ctx->expsyms && ctx->expsyms->stype)
+			free(ctx->expsyms->stype);
+
 		if (ctx->expsyms)
 			free(ctx->expsyms);
 
@@ -90,8 +93,10 @@ static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
 	size_t		nbytes;
 	size_t		size;
 	char *		dst;
+	const char *	base;
 	const char *	ch;
 	const char **	sym;
+	int		stype;
 
 	const char	exphdr[] = "EXPORTS\n";
 	const char	imphdr[] = "IMPORTS\n";
@@ -103,7 +108,7 @@ static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
 		nsyms += (*ch == '\n');
 
 	size = offsetof(struct mdso_unit_ctx_impl,expsyms);
-	size += (nsyms+1)*sizeof(const char *);
+	size += (++nsyms)*sizeof(const char *);
 
 	if (!(ctx->expsyms = calloc(1,size)))
 		return -1;
@@ -111,6 +116,10 @@ static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
 	if (!(ctx->expsyms->buffer = calloc(1,ctx->map.size)))
 		return -1;
 
+	if (!(ctx->expsyms->stype = calloc(nsyms,sizeof(int))))
+		return -1;
+
+	base	= ctx->map.addr;
 	ch	= ctx->map.addr;
 	nbytes	= ctx->map.size;
 	sym	= ctx->expsyms->syms;
@@ -135,7 +144,7 @@ static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
 
 	while (nbytes && ((nbytes < size) || (strncmp(ch,imphdr,size)))) {
 		/* vector */
-		*sym++ = dst;
+		*sym = dst;
 
 		/* symbol */
 		for (; nbytes && ((*ch!=' ')
@@ -150,6 +159,16 @@ static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
 		for (; nbytes && (*ch!='\n'); nbytes--)
 			ch++;
 
+		/* stype */
+		stype = ((*ch=='\n')
+				&& ((ch-base) >= 6)
+				&& !strncmp(&ch[-5]," DATA\n",6))
+			? MDSO_SYMBOL_TYPE_DATA
+			: MDSO_SYMBOL_TYPE_CODE;
+
+		ctx->expsyms->stype[sym - ctx->expsyms->syms] = stype;
+		sym++;
+
 		/* advance to next symbol */
 		for (; nbytes && ((*ch==' ')
 				|| (*ch=='\t')
@@ -213,6 +232,7 @@ int mdso_get_unit_ctx(
 	ctx->uctx.map	= &ctx->map;
 	ctx->uctx.cctx	= &ctx->cctx;
 	ctx->uctx.syms	= ctx->expsyms->syms;
+	ctx->uctx.stype	= ctx->expsyms->stype;
 
 	*pctx = &ctx->uctx;
 	return 0;
diff --git a/src/internal/mdso_driver_impl.h b/src/internal/mdso_driver_impl.h
index 6b092dc..dc658af 100644
--- a/src/internal/mdso_driver_impl.h
+++ b/src/internal/mdso_driver_impl.h
@@ -28,6 +28,7 @@ enum app_tags {
 
 struct mdso_expsyms {
 	char *		buffer;
+	int *		stype;
 	const char *	syms[];
 };
 
-- 
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