initial commit.

1 files changed, 209 insertions, 0 deletions

diff --git a/src/meta/pe_get_symbol_name.c b/src/meta/pe_get_symbol_name.c
new file mode 100644
index 0000000..f9001ef
--- /dev/null
+++ b/src/meta/pe_get_symbol_name.c
@@ -0,0 +1,209 @@
+/*****************************************************************************/
+/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
+/*  Copyright (C) 2013,2014,2015  Z. Gilboa                                  */
+/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
+/*****************************************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <pemagine/pemagine.h>
+
+/* private args structure */
+struct pe_symbol_name_ctx {
+	const void *	addr;
+	char *		name;
+};
+
+/* private forward declarations */
+static int pe_enum_exports_callback(
+	const void *			base,
+	struct pe_export_hdr *		exp_hdr,
+	struct pe_export_sym *		sym,
+	enum pe_callback_reason		reason,
+	void *				context);
+
+#if defined (__NT32)
+static char * pe_get_imported_symbol_info_32(
+	const void *			sym_addr,
+	void **				sym_image_addr,
+	char **				sym_name,
+	struct pe_ldr_tbl_entry **	ldr_tbl_entry);
+#endif
+
+#if defined (__NT64)
+static char * pe_get_imported_symbol_info_64(
+	const void *			sym_addr,
+	void **				sym_image_addr,
+	char **				sym_name,
+	struct pe_ldr_tbl_entry **	ldr_tbl_entry);
+;
+#endif
+
+pe_api
+char * pe_get_symbol_name(const void * base, const void * sym_addr)
+{
+	struct pe_export_sym		exp_item;
+	struct pe_symbol_name_ctx	ctx;
+
+	ctx.name = 0;
+	ctx.addr = sym_addr;
+
+	pe_enum_image_exports(
+		base,
+		pe_enum_exports_callback,
+		&exp_item,
+		&ctx);
+
+	return ctx.name;
+}
+
+
+pe_api
+char * pe_get_import_symbol_info(
+	const void *			sym_addr,
+	void **				sym_image_addr,
+	char **				sym_name,
+	struct pe_ldr_tbl_entry **	ldr_tbl_entry)
+{
+	#if defined(__NT32)
+		return pe_get_imported_symbol_info_32(
+			sym_addr,
+			sym_image_addr,
+			sym_name,
+			ldr_tbl_entry);
+	#elif defined (__NT64)
+		return pe_get_imported_symbol_info_64(
+			sym_addr,
+			sym_image_addr,
+			sym_name,
+			ldr_tbl_entry);
+	#endif
+}
+
+static int pe_enum_exports_callback(
+	const void *			base,
+	struct pe_export_hdr *		exp_hdr,
+	struct pe_export_sym  *		sym,
+	enum pe_callback_reason		reason,
+	void *				context)
+{
+	struct pe_symbol_name_ctx * ctx;
+
+	if (reason != PE_CALLBACK_REASON_ITEM)
+		return 1;
+
+	ctx = (struct pe_symbol_name_ctx *)context;
+
+	if (sym->addr == ctx->addr) {
+		ctx->name = sym->name;
+		return 0;
+	} else
+		return 1;
+}
+
+
+#ifdef __NT32
+static char * pe_get_imported_symbol_info_32(
+	const void *			sym_addr,
+	void **				sym_image_addr,
+	char **				sym_name,
+	struct pe_ldr_tbl_entry **	ldr_tbl_entry)
+{
+	struct symbol {
+		unsigned char	call;
+		unsigned char	ds;
+		unsigned char	sym_addr[4];
+		unsigned char	padding[2];
+	};
+
+	char *				fn_name;
+	struct pe_ldr_tbl_entry *	mod_info;
+	void *				mod_base;
+	uint32_t ***			sym_redirected_addr;
+	struct symbol *			sym;
+
+	fn_name  = 0;
+	mod_info = 0;
+	sym = (struct symbol *)sym_addr;
+
+	if ((sym->call == 0xff) && (sym->ds == 0x25)) {
+		sym_redirected_addr = (uint32_t ***)sym->sym_addr;
+
+		if (sym_redirected_addr)
+			mod_info = pe_get_symbol_module_info(**sym_redirected_addr);
+
+		if (mod_info)
+			mod_base = mod_info->dll_base;
+		else
+			mod_base = (void *)0;
+
+		if (mod_base)
+			fn_name = pe_get_symbol_name(
+				mod_base,
+				**sym_redirected_addr);
+	}
+
+	if (fn_name && ldr_tbl_entry)
+		*ldr_tbl_entry = mod_info;
+
+	return fn_name;
+}
+#endif
+
+
+#ifdef __NT64
+static char * pe_get_imported_symbol_info_64(
+	const void *			sym_addr,
+	void **				sym_image_addr,
+	char **				sym_name,
+	struct pe_ldr_tbl_entry **	ldr_tbl_entry)
+{
+	struct symbol {
+		unsigned char	call;
+		unsigned char	ds;
+		unsigned char	sym_addr[4];
+		unsigned char	padding[2];
+	};
+
+	char *				fn_name;
+	struct pe_ldr_tbl_entry *	mod_info;
+	void *				mod_base;
+	uint32_t *			sym_offset;
+	uint32_t			offset;
+	struct symbol *			sym;
+
+	fn_name  = 0;
+	mod_info = 0;
+	sym = (struct symbol *)sym_addr;
+
+	if ((sym->call == 0xff) && (sym->ds == 0x25)) {
+		sym_offset = (uint32_t *)sym->sym_addr;
+
+		if (sym_offset) {
+			offset		= *sym_offset;
+			sym_addr	= *(void **)(offset + (uintptr_t)(++sym_offset));
+			mod_info	= pe_get_symbol_module_info(sym_addr);
+		}
+
+		if (mod_info)
+			mod_base = mod_info->dll_base;
+		else
+			mod_base = (void *)0;
+
+		if (mod_base)
+			fn_name = pe_get_symbol_name(mod_base,sym_addr);
+	}
+
+	if (fn_name) {
+		if (ldr_tbl_entry)
+			*ldr_tbl_entry = mod_info;
+
+		if (sym_image_addr)
+			*sym_image_addr = (void *)sym_addr;
+
+		if (sym_name)
+			*sym_name = fn_name;
+	}
+
+	return fn_name;
+}
+#endif