include: libsframe: add APIs for SFrame header flags

Add new APIs, one each for getting flags from the SFrame decoder and
SFrame encoder context objects respectively.

These will later be used by the linker to uniformly access the flags,
given the SFrame decoder and SFrame encoder objects.

Use the new API, where applicable, within libsframe.

include/
        * sframe-api.h (sframe_decoder_get_flags): New declaration.
        (sframe_encoder_get_flags): Likewise.
libsframe/
	* libsframe.ver: List new APIs.
        * sframe.c (sframe_decoder_get_flags): New definition.
	(sframe_encoder_get_flags): Likewise.
        (sframe_get_funcdesc_with_addr_internal): Use the new API.
        (sframe_encoder_get_flags): Likewise.
        (sframe_encoder_write_sframe): Likewise.

3 files changed, 33 insertions, 4 deletions

diff --git a/include/sframe-api.h b/include/sframe-api.h
index 77ba32b..e5262ae 100644
--- a/include/sframe-api.h
+++ b/include/sframe-api.h
@@ -124,6 +124,10 @@ sframe_decoder_get_abi_arch (sframe_decoder_ctx *dctx);
 extern uint8_t
 sframe_decoder_get_version (sframe_decoder_ctx *dctx);
 
+/* Get the section flags from the SFrame decoder context DCTX.  */
+extern uint8_t
+sframe_decoder_get_flags (sframe_decoder_ctx *dctx);
+
 /* Return the number of function descriptor entries in the SFrame decoder
    DCTX.  */
 extern uint32_t
@@ -238,6 +242,10 @@ sframe_encoder_get_abi_arch (sframe_encoder_ctx *encoder);
 extern uint8_t
 sframe_encoder_get_version (sframe_encoder_ctx *encoder);
 
+/* Get the section flags from the SFrame encoder context ENCODER.  */
+extern uint8_t
+sframe_encoder_get_flags (sframe_encoder_ctx *encoder);
+
 /* Return the number of function descriptor entries in the SFrame encoder
    ENCODER.  */
 extern uint32_t
diff --git a/libsframe/libsframe.ver b/libsframe/libsframe.ver
index 57f5fb6..7038d69 100644
--- a/libsframe/libsframe.ver
+++ b/libsframe/libsframe.ver
@@ -38,3 +38,8 @@ LIBSFRAME_1.0 {
   local:
     *;
 } LIBSFRAME_0.0;
+
+LIBSFRAME_1.1 {
+    sframe_decoder_get_flags;
+    sframe_encoder_get_flags;
+} LIBSFRAME_1.0;
diff --git a/libsframe/sframe.c b/libsframe/sframe.c
index 2894009..fcc2660 100644
--- a/libsframe/sframe.c
+++ b/libsframe/sframe.c
@@ -988,6 +988,15 @@ sframe_decoder_get_version (sframe_decoder_ctx *dctx)
   return dhp->sfh_preamble.sfp_version;
 }
 
+/* Get the section flags from the SFrame decoder context DCTX.  */
+
+uint8_t
+sframe_decoder_get_flags (sframe_decoder_ctx *dctx)
+{
+  const sframe_header *dhp = sframe_decoder_get_header (dctx);
+  return dhp->sfh_preamble.sfp_flags;
+}
+
 /* Get the SFrame's fixed FP offset given the decoder context CTX.  */
 int8_t
 sframe_decoder_get_fixed_fp_offset (sframe_decoder_ctx *ctx)
@@ -1038,7 +1047,7 @@ sframe_get_funcdesc_with_addr_internal (sframe_decoder_ctx *ctx, int32_t addr,
     return sframe_ret_set_errno (errp, SFRAME_ERR_DCTX_INVAL);
   /* If the FDE sub-section is not sorted on PCs, skip the lookup because
      binary search cannot be used.  */
-  if ((dhp->sfh_preamble.sfp_flags & SFRAME_F_FDE_SORTED) == 0)
+  if ((sframe_decoder_get_flags (ctx) & SFRAME_F_FDE_SORTED) == 0)
     return sframe_ret_set_errno (errp, SFRAME_ERR_FDE_NOTSORTED);
 
   /* Do the binary search.  */
@@ -1402,6 +1411,15 @@ sframe_encoder_get_version (sframe_encoder_ctx *encoder)
   return ehp->sfh_preamble.sfp_version;
 }
 
+/* Get the section flags from the SFrame encoder context ENCODER.  */
+
+uint8_t
+sframe_encoder_get_flags (sframe_encoder_ctx *encoder)
+{
+  const sframe_header *ehp = sframe_encoder_get_header (encoder);
+  return ehp->sfh_preamble.sfp_flags;
+}
+
 /* Return the number of function descriptor entries in the SFrame encoder
    ENCODER.  */
 
@@ -1736,7 +1754,6 @@ sframe_encoder_write_sframe (sframe_encoder_ctx *encoder)
   size_t fre_size;
   size_t esz = 0;
   sframe_header *ehp;
-  unsigned char flags;
   sf_fde_tbl *fd_info;
   sf_fre_tbl *fr_info;
   uint32_t i, num_fdes;
@@ -1806,8 +1823,7 @@ sframe_encoder_write_sframe (sframe_encoder_ctx *encoder)
   /* Sanity checks:
      - the FDE section must have been sorted by now on the start address
      of each function.  */
-  flags = ehp->sfh_preamble.sfp_flags;
-  if (!(flags & SFRAME_F_FDE_SORTED)
+  if (!(sframe_encoder_get_flags (encoder) & SFRAME_F_FDE_SORTED)
       || (fd_info == NULL))
     return sframe_set_errno (&err, SFRAME_ERR_FDE_INVAL);