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objtool: Disassemble exception table alternatives

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When using the --disas option, also disassemble exception tables
(EX_TABLE).

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/20251121095340.464045-23-alexandre.chartre@oracle.com
This commit is contained in:
Alexandre Chartre
2025-11-21 10:53:32 +01:00
committed by Peter Zijlstra
parent 15e7ad8667
commit 78df4590c5
1 changed files with 25 additions and 1 deletions
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26
tools/objtool/disas.c
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@@ -639,6 +639,26 @@ static int disas_alt_add_insn(struct disas_alt *dalt, int index, char *insn_str,
return 0;
}
/*
* Disassemble an exception table alternative.
*/
static int disas_alt_extable(struct disas_alt *dalt)
{
struct instruction *alt_insn;
char *str;
alt_insn = dalt->alt->insn;
str = strfmt("resume at 0x%lx <%s+0x%lx>",
alt_insn->offset, alt_insn->sym->name,
alt_insn->offset - alt_insn->sym->offset);
if (!str)
return -1;
disas_alt_add_insn(dalt, 0, str, 0);
return 1;
}
/*
* Disassemble an alternative and store instructions in the disas_alt
* structure. Return the number of instructions in the alternative.
@@ -790,12 +810,16 @@ static void *disas_alt(struct disas_context *dctx,
}
/*
* Only group alternatives are supported at the moment.
* Only group alternatives and exception tables are
* supported at the moment.
*/
switch (dalt->alt->type) {
case ALT_TYPE_INSTRUCTIONS:
count = disas_alt_group(dctx, dalt);
break;
case ALT_TYPE_EX_TABLE:
count = disas_alt_extable(dalt);
break;
default:
count = 0;
}