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Commit 7bd2a600 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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objtool: Cache instruction relocs


Track the reloc of instructions in the new instruction->reloc field
to avoid having to look them up again later.

( Technically x86 instructions can have two relocations, but not jumps
  and calls, for which we're using this. )

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarMiroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151300.195441549@infradead.org
parent 43d5430a
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...@@ -797,6 +797,25 @@ __weak bool arch_is_retpoline(struct symbol *sym) ...@@ -797,6 +797,25 @@ __weak bool arch_is_retpoline(struct symbol *sym)
return false; return false;
} }
#define NEGATIVE_RELOC ((void *)-1L)
static struct reloc *insn_reloc(struct objtool_file *file, struct instruction *insn)
{
if (insn->reloc == NEGATIVE_RELOC)
return NULL;
if (!insn->reloc) {
insn->reloc = find_reloc_by_dest_range(file->elf, insn->sec,
insn->offset, insn->len);
if (!insn->reloc) {
insn->reloc = NEGATIVE_RELOC;
return NULL;
}
}
return insn->reloc;
}
/* /*
* Find the destination instructions for all jumps. * Find the destination instructions for all jumps.
*/ */
...@@ -811,8 +830,7 @@ static int add_jump_destinations(struct objtool_file *file) ...@@ -811,8 +830,7 @@ static int add_jump_destinations(struct objtool_file *file)
if (!is_static_jump(insn)) if (!is_static_jump(insn))
continue; continue;
reloc = find_reloc_by_dest_range(file->elf, insn->sec, reloc = insn_reloc(file, insn);
insn->offset, insn->len);
if (!reloc) { if (!reloc) {
dest_sec = insn->sec; dest_sec = insn->sec;
dest_off = arch_jump_destination(insn); dest_off = arch_jump_destination(insn);
...@@ -944,8 +962,7 @@ static int add_call_destinations(struct objtool_file *file) ...@@ -944,8 +962,7 @@ static int add_call_destinations(struct objtool_file *file)
if (insn->type != INSN_CALL) if (insn->type != INSN_CALL)
continue; continue;
reloc = find_reloc_by_dest_range(file->elf, insn->sec, reloc = insn_reloc(file, insn);
insn->offset, insn->len);
if (!reloc) { if (!reloc) {
dest_off = arch_jump_destination(insn); dest_off = arch_jump_destination(insn);
insn->call_dest = find_call_destination(insn->sec, dest_off); insn->call_dest = find_call_destination(insn->sec, dest_off);
...@@ -1144,8 +1161,7 @@ static int handle_group_alt(struct objtool_file *file, ...@@ -1144,8 +1161,7 @@ static int handle_group_alt(struct objtool_file *file,
* alternatives code can adjust the relative offsets * alternatives code can adjust the relative offsets
* accordingly. * accordingly.
*/ */
alt_reloc = find_reloc_by_dest_range(file->elf, insn->sec, alt_reloc = insn_reloc(file, insn);
insn->offset, insn->len);
if (alt_reloc && if (alt_reloc &&
!arch_support_alt_relocation(special_alt, insn, alt_reloc)) { !arch_support_alt_relocation(special_alt, insn, alt_reloc)) {
......
...@@ -56,6 +56,7 @@ struct instruction { ...@@ -56,6 +56,7 @@ struct instruction {
struct instruction *jump_dest; struct instruction *jump_dest;
struct instruction *first_jump_src; struct instruction *first_jump_src;
struct reloc *jump_table; struct reloc *jump_table;
struct reloc *reloc;
struct list_head alts; struct list_head alts;
struct symbol *func; struct symbol *func;
struct list_head stack_ops; struct list_head stack_ops;
......
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