[PATCH v3 2/3] libelf: Expand ELF note printing

[Jason Andryuk <jason.andryuk@xxxxxxx>]

The XEN_ELFNOTE_L1_MFN_VALID is an array of pairs of values, but it is
printed as:
(XEN) ELF: note: L1_MFN_VALID = 0

This is a limitation of only printing either string or numeric values.
Switch from the boolean to an enum which allows more flexibility in
printing the values.  Introduce ELFNOTE_NAME to only print the name
without a value like:
(XEN) ELF: note: L1_MFN_VALID

Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
v3:
Remove fatal size check
Don't print values - just the name for presence
---
 xen/common/libelf/libelf-dominfo.c | 50 +++++++++++++++++-------------
 1 file changed, 29 insertions(+), 21 deletions(-)

diff --git a/xen/common/libelf/libelf-dominfo.c 
b/xen/common/libelf/libelf-dominfo.c
index a13a5e4db6..405510ead9 100644
--- a/xen/common/libelf/libelf-dominfo.c
+++ b/xen/common/libelf/libelf-dominfo.c
@@ -101,26 +101,30 @@ elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
 /* *INDENT-OFF* */
     static const struct {
         const char *name;
-        bool str;
+        enum {
+            ELFNOTE_INT,
+            ELFNOTE_STRING,
+            ELFNOTE_NAME,
+        } type;
     } note_desc[] = {
-        [XEN_ELFNOTE_ENTRY] = { "ENTRY", 0},
-        [XEN_ELFNOTE_HYPERCALL_PAGE] = { "HYPERCALL_PAGE", 0},
-        [XEN_ELFNOTE_VIRT_BASE] = { "VIRT_BASE", 0},
-        [XEN_ELFNOTE_INIT_P2M] = { "INIT_P2M", 0},
-        [XEN_ELFNOTE_PADDR_OFFSET] = { "PADDR_OFFSET", 0},
-        [XEN_ELFNOTE_HV_START_LOW] = { "HV_START_LOW", 0},
-        [XEN_ELFNOTE_XEN_VERSION] = { "XEN_VERSION", 1},
-        [XEN_ELFNOTE_GUEST_OS] = { "GUEST_OS", 1},
-        [XEN_ELFNOTE_GUEST_VERSION] = { "GUEST_VERSION", 1},
-        [XEN_ELFNOTE_LOADER] = { "LOADER", 1},
-        [XEN_ELFNOTE_PAE_MODE] = { "PAE_MODE", 1},
-        [XEN_ELFNOTE_FEATURES] = { "FEATURES", 1},
-        [XEN_ELFNOTE_SUPPORTED_FEATURES] = { "SUPPORTED_FEATURES", 0},
-        [XEN_ELFNOTE_BSD_SYMTAB] = { "BSD_SYMTAB", 1},
-        [XEN_ELFNOTE_L1_MFN_VALID] = { "L1_MFN_VALID", false },
-        [XEN_ELFNOTE_SUSPEND_CANCEL] = { "SUSPEND_CANCEL", 0 },
-        [XEN_ELFNOTE_MOD_START_PFN] = { "MOD_START_PFN", 0 },
-        [XEN_ELFNOTE_PHYS32_ENTRY] = { "PHYS32_ENTRY", 0 },
+        [XEN_ELFNOTE_ENTRY] = { "ENTRY", ELFNOTE_INT },
+        [XEN_ELFNOTE_HYPERCALL_PAGE] = { "HYPERCALL_PAGE", ELFNOTE_INT },
+        [XEN_ELFNOTE_VIRT_BASE] = { "VIRT_BASE", ELFNOTE_INT },
+        [XEN_ELFNOTE_INIT_P2M] = { "INIT_P2M", ELFNOTE_INT },
+        [XEN_ELFNOTE_PADDR_OFFSET] = { "PADDR_OFFSET", ELFNOTE_INT },
+        [XEN_ELFNOTE_HV_START_LOW] = { "HV_START_LOW", ELFNOTE_INT },
+        [XEN_ELFNOTE_XEN_VERSION] = { "XEN_VERSION", ELFNOTE_STRING },
+        [XEN_ELFNOTE_GUEST_OS] = { "GUEST_OS", ELFNOTE_STRING },
+        [XEN_ELFNOTE_GUEST_VERSION] = { "GUEST_VERSION", ELFNOTE_STRING },
+        [XEN_ELFNOTE_LOADER] = { "LOADER", ELFNOTE_STRING },
+        [XEN_ELFNOTE_PAE_MODE] = { "PAE_MODE", ELFNOTE_STRING },
+        [XEN_ELFNOTE_FEATURES] = { "FEATURES", ELFNOTE_STRING },
+        [XEN_ELFNOTE_SUPPORTED_FEATURES] = { "SUPPORTED_FEATURES", ELFNOTE_INT 
},
+        [XEN_ELFNOTE_BSD_SYMTAB] = { "BSD_SYMTAB", ELFNOTE_STRING },
+        [XEN_ELFNOTE_L1_MFN_VALID] = { "L1_MFN_VALID", ELFNOTE_NAME },
+        [XEN_ELFNOTE_SUSPEND_CANCEL] = { "SUSPEND_CANCEL", ELFNOTE_INT },
+        [XEN_ELFNOTE_MOD_START_PFN] = { "MOD_START_PFN", ELFNOTE_INT },
+        [XEN_ELFNOTE_PHYS32_ENTRY] = { "PHYS32_ENTRY", ELFNOTE_INT },
     };
 /* *INDENT-ON* */
 
@@ -136,7 +140,7 @@ elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
         return 0;
     }
 
-    if ( note_desc[type].str )
+    if ( note_desc[type].type == ELFNOTE_STRING )
     {
         str = elf_strval(elf, elf_note_desc(elf, note));
         if (str == NULL)
@@ -146,13 +150,17 @@ elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
         parms->elf_notes[type].type = XEN_ENT_STR;
         parms->elf_notes[type].data.str = str;
     }
-    else
+    else if ( note_desc[type].type == ELFNOTE_INT )
     {
         val = elf_note_numeric(elf, note);
         elf_msg(elf, "ELF: note: %s = %#" PRIx64 "\n", note_desc[type].name, 
val);
         parms->elf_notes[type].type = XEN_ENT_LONG;
         parms->elf_notes[type].data.num = val;
     }
+    else if ( note_desc[type].type == ELFNOTE_NAME )
+    {
+        elf_msg(elf, "ELF: note: %s\n", note_desc[type].name);
+    }
     parms->elf_notes[type].name = note_desc[type].name;
 
     switch ( type )
-- 
2.44.0