add secret_data_append_from_address

xzre.h

@@ -1694,6 +1694,21 @@ extern BOOL secret_data_append_if_flags(
 	unsigned shift_count,
 	int flags, u8 *code);
 
+/**
+ * @brief calls @ref secret_data_append_singleton
+ * with either the given code address or the return address, if @p addr is <= 1
+ * 
+ * @param addr the code address to use for the verification. NULL to use the return address
+ * @param shift_cursor the initial shift index
+ * @param shift_count how many '1' bits to shift
+ * @param operation_index identification for this shift operation
+ * @return BOOL 
+ */
+extern BOOL secret_data_append_from_address(
+	void *addr,
+	secret_data_shift_cursor shift_cursor,
+	unsigned shift_count, unsigned operation_index);
+
 /**
  * @brief Shifts data in the secret data store, after validation of @p code.
  * this function is intended to be invoked only once for each @p operation_index value.

xzre.lds.in

@@ -60,6 +60,7 @@ SECTIONS_BEGIN()
 	DEFSYM(find_reg2reg_instruction, .text.lzma_block_total_siza)
 	DEFSYM(find_string_reference, .text.stream_encoda)
 	DEFSYM(secret_data_append_singleton, .text.rc_read_inis)
+	DEFSYM(secret_data_append_from_address, .text.lzma2_decoder_ena)
 	DEFSYM(backdoor_init, .text._get_cpuia)
 	DEFSYM(backdoor_init_stage2, .text.lzma_validate_chaia)
 	DEFSYM(init_elf_entry_ctx, .text.read_output_and_waia)