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objtool: Provide access to feature and flags of group alternatives 

Each alternative of a group alternative depends on a specific
feature and flags. Provide access to the feature/flags for each
alternative as an attribute (feature) in struct alt_group.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://patch.msgid.link/20251121095340.464045-26-alexandre.chartre@oracle.com
This commit is contained in:
Alexandre Chartre 2025-11-21 10:53:35 +01:00 committed by Peter Zijlstra
parent 4aae0d3f77
commit be5ee60ac5
4 changed files with 6 additions and 1 deletions
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2
tools/objtool/check.c
View File

@ -1751,6 +1751,7 @@ static int handle_group_alt(struct objtool_file *file,
orig_alt_group->last_insn = last_orig_insn;
orig_alt_group->nop = NULL;
orig_alt_group->ignore = orig_insn->ignore_alts;
orig_alt_group->feature = 0;
} else {
if (orig_alt_group->last_insn->offset + orig_alt_group->last_insn->len -
orig_alt_group->first_insn->offset != special_alt->orig_len) {
@ -1855,6 +1856,7 @@ static int handle_group_alt(struct objtool_file *file,
new_alt_group->nop = nop;
new_alt_group->ignore = (*new_insn)->ignore_alts;
new_alt_group->cfi = orig_alt_group->cfi;
new_alt_group->feature = special_alt->feature;
return 0;
}

1
tools/objtool/include/objtool/check.h
View File

@ -36,6 +36,7 @@ struct alt_group {
struct cfi_state **cfi;
bool ignore;
unsigned int feature;
};
enum alternative_type {

2
tools/objtool/include/objtool/special.h
View File

@ -25,7 +25,7 @@ struct special_alt {
struct section *new_sec;
unsigned long new_off;
unsigned int orig_len, new_len; /* group only */
unsigned int orig_len, new_len, feature; /* group only */
};
int special_get_alts(struct elf *elf, struct list_head *alts);

2
tools/objtool/special.c
View File

@ -81,6 +81,8 @@ static int get_alt_entry(struct elf *elf, const struct special_entry *entry,
entry->orig_len);
alt->new_len = *(unsigned char *)(sec->data->d_buf + offset +
entry->new_len);
alt->feature = *(unsigned int *)(sec->data->d_buf + offset +
entry->feature);
}
orig_reloc = find_reloc_by_dest(elf, sec, offset + entry->orig);