From: Peter Zijlstra <peterz@infradead.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@kernel.org>,
Suleiman Souhlal <suleiman@google.com>, bpf <bpf@vger.kernel.org>,
linux-kernel@vger.kernel.org, Borislav Petkov <bp@suse.de>,
Josh Poimboeuf <jpoimboe@kernel.org>,
x86@kernel.org
Subject: Re: [PATCH 1/2] x86/kprobes: Fix kprobes instruction boudary check with CONFIG_RETHUNK
Date: Wed, 7 Sep 2022 09:06:44 +0200 [thread overview]
Message-ID: <YxhDBAhYrs0Sfqjt@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <166251212072.632004.16078953024905883328.stgit@devnote2>
On Wed, Sep 07, 2022 at 09:55:21AM +0900, Masami Hiramatsu (Google) wrote:
> +/* Return the jump target address or 0 */
> +static inline unsigned long insn_get_branch_addr(struct insn *insn)
> +{
> + switch (insn->opcode.bytes[0]) {
> + case 0xe0: /* loopne */
> + case 0xe1: /* loope */
> + case 0xe2: /* loop */
Oh cute, objtool doesn't know about those, let me go add them.
> + case 0xe3: /* jcxz */
> + case 0xe9: /* near relative jump */
/* JMP.d32 */
> + case 0xeb: /* short relative jump */
/* JMP.d8 */
> + break;
> + case 0x0f:
> + if ((insn->opcode.bytes[1] & 0xf0) == 0x80) /* jcc near */
/* Jcc.d32 */
Are the GNU AS names for these things.
> + break;
> + return 0;
> + default:
> + if ((insn->opcode.bytes[0] & 0xf0) == 0x70) /* jcc short */
> + break;
> + return 0;
You could write that as:
case 0x70 ... 0x7f: /* Jcc.d8 */
break;
default:
return 0;
> + }
> + return (unsigned long)insn->next_byte + insn->immediate.value;
> +}
next prev parent reply other threads:[~2022-09-07 7:06 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-07 0:55 [PATCH 0/2] x86/kprobes: Fixes for CONFIG_RETHUNK Masami Hiramatsu (Google)
2022-09-07 0:55 ` [PATCH 1/2] x86/kprobes: Fix kprobes instruction boudary check with CONFIG_RETHUNK Masami Hiramatsu (Google)
2022-09-07 7:06 ` Peter Zijlstra [this message]
2022-09-07 9:01 ` [PATCH] objtool,x86: Teach decode about LOOP* instructions Peter Zijlstra
2022-09-07 9:06 ` David Laight
2022-09-07 9:40 ` Peter Zijlstra
2022-09-07 11:13 ` David Laight
2022-09-15 14:24 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2022-09-07 9:12 ` [PATCH 1/2] x86/kprobes: Fix kprobes instruction boudary check with CONFIG_RETHUNK Masami Hiramatsu
2022-09-07 9:38 ` Peter Zijlstra
2022-09-07 9:53 ` Masami Hiramatsu
2022-09-07 8:02 ` Peter Zijlstra
2022-09-07 8:11 ` Peter Zijlstra
2022-09-07 9:49 ` Masami Hiramatsu
2022-09-07 10:19 ` Peter Zijlstra
2022-09-07 11:44 ` Peter Zijlstra
2022-09-07 13:05 ` Peter Zijlstra
2022-09-07 14:14 ` Masami Hiramatsu
2022-09-07 14:27 ` Peter Zijlstra
2022-09-07 15:22 ` Masami Hiramatsu
2022-09-07 12:56 ` Peter Zijlstra
2022-09-07 13:49 ` Masami Hiramatsu
2022-09-07 14:28 ` Peter Zijlstra
2022-09-07 12:59 ` Peter Zijlstra
2022-09-07 13:53 ` Masami Hiramatsu
2022-09-07 0:55 ` [PATCH 2/2] x86/kprobes: Fix optprobe optimization " Masami Hiramatsu (Google)
2022-09-07 6:52 ` [PATCH 0/2] x86/kprobes: Fixes for CONFIG_RETHUNK Peter Zijlstra
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