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x86/unwind_user: Guard unwind_user_word_size() by UNWIND_USER

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The unwind user framework in general requires an architecture-specific
implementation of unwind_user_word_size() to be present for any unwind
method, whether that is fp or a future other method, such as potentially
sframe.

Guard unwind_user_word_size() by the availability of the UNWIND_USER
framework instead of the specific HAVE_UNWIND_USER_FP method.

This facilitates to selectively disable HAVE_UNWIND_USER_FP on x86
(e.g. for test purposes) once a new unwind method is added to unwind
user.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251208160352.1363040-4-jremus@linux.ibm.com
This commit is contained in:
Jens Remus 2025-12-08 17:03:51 +01:00 committed by Peter Zijlstra
parent 2652f9a4b0
commit aa6047ef72
1 changed files with 17 additions and 13 deletions
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30
arch/x86/include/asm/unwind_user.h
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@ -2,23 +2,11 @@
#ifndef _ASM_X86_UNWIND_USER_H
#define _ASM_X86_UNWIND_USER_H
#ifdef CONFIG_HAVE_UNWIND_USER_FP
#ifdef CONFIG_UNWIND_USER
#include <asm/ptrace.h>
#include <asm/uprobes.h>
#define ARCH_INIT_USER_FP_FRAME(ws) \
.cfa_off = 2*(ws), \
.ra_off = -1*(ws), \
.fp_off = -2*(ws), \
.use_fp = true,
#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws) \
.cfa_off = 1*(ws), \
.ra_off = -1*(ws), \
.fp_off = 0, \
.use_fp = false,
static inline int unwind_user_word_size(struct pt_regs *regs)
{
/* We can't unwind VM86 stacks */
@ -31,6 +19,22 @@ static inline int unwind_user_word_size(struct pt_regs *regs)
return sizeof(long);
}
#endif /* CONFIG_UNWIND_USER */
#ifdef CONFIG_HAVE_UNWIND_USER_FP
#define ARCH_INIT_USER_FP_FRAME(ws) \
.cfa_off = 2*(ws), \
.ra_off = -1*(ws), \
.fp_off = -2*(ws), \
.use_fp = true,
#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws) \
.cfa_off = 1*(ws), \
.ra_off = -1*(ws), \
.fp_off = 0, \
.use_fp = false,
static inline bool unwind_user_at_function_start(struct pt_regs *regs)
{
return is_uprobe_at_func_entry(regs);