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x86/stackframe/32: Allow int3_emulate_push()

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Now that x86_32 has an unconditional gap on the kernel stack frame,
the int3_emulate_push() thing will work without further changes.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2019-05-08 09:40:54 +02:00 committed by Ingo Molnar
parent 3c88c692c2
commit faeedb0679
2 changed files with 0 additions and 9 deletions
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2
arch/x86/include/asm/text-patching.h
View File

@ -51,7 +51,6 @@ static inline void int3_emulate_jmp(struct pt_regs *regs, unsigned long ip)
#define INT3_INSN_SIZE 1
#define CALL_INSN_SIZE 5
#ifdef CONFIG_X86_64
static inline void int3_emulate_push(struct pt_regs *regs, unsigned long val)
{
/*
@ -69,7 +68,6 @@ static inline void int3_emulate_call(struct pt_regs *regs, unsigned long func)
int3_emulate_push(regs, regs->ip - INT3_INSN_SIZE + CALL_INSN_SIZE);
int3_emulate_jmp(regs, func);
}
#endif /* CONFIG_X86_64 */
#endif /* !CONFIG_UML_X86 */
#endif /* _ASM_X86_TEXT_PATCHING_H */

7
arch/x86/kernel/ftrace.c
View File

@ -300,7 +300,6 @@ int ftrace_int3_handler(struct pt_regs *regs)
ip = regs->ip - INT3_INSN_SIZE;
#ifdef CONFIG_X86_64
if (ftrace_location(ip)) {
int3_emulate_call(regs, (unsigned long)ftrace_regs_caller);
return 1;
@ -312,12 +311,6 @@ int ftrace_int3_handler(struct pt_regs *regs)
int3_emulate_call(regs, ftrace_update_func_call);
return 1;
}
#else
if (ftrace_location(ip) || is_ftrace_caller(ip)) {
int3_emulate_jmp(regs, ip + CALL_INSN_SIZE);
return 1;
}
#endif
return 0;
}