[xen staging] symbols: don't omit "end" symbols upon mixed code / data aliases

[patchbot@xxxxxxx]

commit af2dbe260f3d5bdd5d47dacc87bfcc449bf91c24
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jan 26 11:49:31 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jan 26 11:49:31 2026 +0100

    symbols: don't omit "end" symbols upon mixed code / data aliases
    
    At the example of _sinitext - that symbol has four aliases on x86:
    __init_begin, __2M_init_start, __2M_rodata_end, and whatever the first
    function in .init.text. With the GNU toolchain all of them are marked
    'T' or 't'. With Clang/LLVM, however, some are marked 'r'. Since, to
    save space, we want fake "end" symbols only for text, right now
    want_symbol_end() has a respective check. That is getting in the way,
    however, when the final of those symbols is 'r'. Remove the check and
    instead zap the size for anything that is non-code.
    
    Fixes: 6eede548df21 ('symbols: avoid emitting "end" symbols for data items')
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/tools/symbols.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/tools/symbols.c b/xen/tools/symbols.c
index a2b46d655c..509394d5a4 100644
--- a/xen/tools/symbols.c
+++ b/xen/tools/symbols.c
@@ -165,6 +165,10 @@ static int read_symbol(FILE *in, struct sym_entry *s)
        else if (str[0] == '$')
                goto skip_tail;
 
+       /* We want fake "end" symbols only for text / code. */
+       if (toupper((uint8_t)stype) != 'T')
+               s->size = 0;
+
        /* include the type field in the symbol name, so that it gets
         * compressed together */
        s->len = strlen(str) + 1;
@@ -316,7 +320,6 @@ static int compare_name_orig(const void *p1, const void *p2)
 static bool want_symbol_end(unsigned int idx)
 {
        return table[idx].size &&
-              toupper(table[idx].type) == 'T' &&
               (idx + 1 == table_cnt ||
                table[idx].addr + table[idx].size < table[idx + 1].addr);
 }
--
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