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Message-ID: <20091125165556.6073.21919.stgit@harusame>
Date: Wed, 25 Nov 2009 11:55:56 -0500
From: Masami Hiramatsu <mhiramat@...hat.com>
To: Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...e.hu>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
lkml <linux-kernel@...r.kernel.org>
Cc: systemtap <systemtap@...rces.redhat.com>,
DLE <dle-develop@...ts.sourceforge.net>,
Masami Hiramatsu <mhiramat@...hat.com>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
Ingo Molnar <mingo@...e.hu>,
Jim Keniston <jkenisto@...ibm.com>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Christoph Hellwig <hch@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Frederic Weisbecker <fweisbec@...il.com>,
"H. Peter Anvin" <hpa@...or.com>,
Anders Kaseorg <andersk@...lice.com>,
Tim Abbott <tabbott@...lice.com>,
Andi Kleen <andi@...stfloor.org>,
Jason Baron <jbaron@...hat.com>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: [PATCH -tip v6 06/11] kprobes/x86: Cleanup save/restore registers
Introduce SAVE/RESOTRE_REGS_STRING for cleanup kretprobe-trampoline asm
code. These macros will be used for emulating interruption.
Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Jim Keniston <jkenisto@...ibm.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Anders Kaseorg <andersk@...lice.com>
Cc: Tim Abbott <tabbott@...lice.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Jason Baron <jbaron@...hat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
---
arch/x86/kernel/kprobes.c | 128 ++++++++++++++++++++++++---------------------
1 files changed, 67 insertions(+), 61 deletions(-)
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index 85d88f6..73ac21e 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -551,6 +551,69 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
return 0;
}
+#ifdef CONFIG_X86_64
+#define SAVE_REGS_STRING \
+ /* Skip cs, ip, orig_ax. */ \
+ " subq $24, %rsp\n" \
+ " pushq %rdi\n" \
+ " pushq %rsi\n" \
+ " pushq %rdx\n" \
+ " pushq %rcx\n" \
+ " pushq %rax\n" \
+ " pushq %r8\n" \
+ " pushq %r9\n" \
+ " pushq %r10\n" \
+ " pushq %r11\n" \
+ " pushq %rbx\n" \
+ " pushq %rbp\n" \
+ " pushq %r12\n" \
+ " pushq %r13\n" \
+ " pushq %r14\n" \
+ " pushq %r15\n"
+#define RESTORE_REGS_STRING \
+ " popq %r15\n" \
+ " popq %r14\n" \
+ " popq %r13\n" \
+ " popq %r12\n" \
+ " popq %rbp\n" \
+ " popq %rbx\n" \
+ " popq %r11\n" \
+ " popq %r10\n" \
+ " popq %r9\n" \
+ " popq %r8\n" \
+ " popq %rax\n" \
+ " popq %rcx\n" \
+ " popq %rdx\n" \
+ " popq %rsi\n" \
+ " popq %rdi\n" \
+ /* Skip orig_ax, ip, cs */ \
+ " addq $24, %rsp\n"
+#else
+#define SAVE_REGS_STRING \
+ /* Skip cs, ip, orig_ax and gs. */ \
+ " subl $16, %esp\n" \
+ " pushl %fs\n" \
+ " pushl %ds\n" \
+ " pushl %es\n" \
+ " pushl %eax\n" \
+ " pushl %ebp\n" \
+ " pushl %edi\n" \
+ " pushl %esi\n" \
+ " pushl %edx\n" \
+ " pushl %ecx\n" \
+ " pushl %ebx\n"
+#define RESTORE_REGS_STRING \
+ " popl %ebx\n" \
+ " popl %ecx\n" \
+ " popl %edx\n" \
+ " popl %esi\n" \
+ " popl %edi\n" \
+ " popl %ebp\n" \
+ " popl %eax\n" \
+ /* Skip ds, es, fs, gs, orig_ax, and ip. Note: don't pop cs here*/\
+ " addl $24, %esp\n"
+#endif
+
/*
* When a retprobed function returns, this code saves registers and
* calls trampoline_handler() runs, which calls the kretprobe's handler.
@@ -564,65 +627,16 @@ static void __used __kprobes kretprobe_trampoline_holder(void)
/* We don't bother saving the ss register */
" pushq %rsp\n"
" pushfq\n"
- /*
- * Skip cs, ip, orig_ax.
- * trampoline_handler() will plug in these values
- */
- " subq $24, %rsp\n"
- " pushq %rdi\n"
- " pushq %rsi\n"
- " pushq %rdx\n"
- " pushq %rcx\n"
- " pushq %rax\n"
- " pushq %r8\n"
- " pushq %r9\n"
- " pushq %r10\n"
- " pushq %r11\n"
- " pushq %rbx\n"
- " pushq %rbp\n"
- " pushq %r12\n"
- " pushq %r13\n"
- " pushq %r14\n"
- " pushq %r15\n"
+ SAVE_REGS_STRING
" movq %rsp, %rdi\n"
" call trampoline_handler\n"
/* Replace saved sp with true return address. */
" movq %rax, 152(%rsp)\n"
- " popq %r15\n"
- " popq %r14\n"
- " popq %r13\n"
- " popq %r12\n"
- " popq %rbp\n"
- " popq %rbx\n"
- " popq %r11\n"
- " popq %r10\n"
- " popq %r9\n"
- " popq %r8\n"
- " popq %rax\n"
- " popq %rcx\n"
- " popq %rdx\n"
- " popq %rsi\n"
- " popq %rdi\n"
- /* Skip orig_ax, ip, cs */
- " addq $24, %rsp\n"
+ RESTORE_REGS_STRING
" popfq\n"
#else
" pushf\n"
- /*
- * Skip cs, ip, orig_ax and gs.
- * trampoline_handler() will plug in these values
- */
- " subl $16, %esp\n"
- " pushl %fs\n"
- " pushl %es\n"
- " pushl %ds\n"
- " pushl %eax\n"
- " pushl %ebp\n"
- " pushl %edi\n"
- " pushl %esi\n"
- " pushl %edx\n"
- " pushl %ecx\n"
- " pushl %ebx\n"
+ SAVE_REGS_STRING
" movl %esp, %eax\n"
" call trampoline_handler\n"
/* Move flags to cs */
@@ -630,15 +644,7 @@ static void __used __kprobes kretprobe_trampoline_holder(void)
" movl %edx, 52(%esp)\n"
/* Replace saved flags with true return address. */
" movl %eax, 56(%esp)\n"
- " popl %ebx\n"
- " popl %ecx\n"
- " popl %edx\n"
- " popl %esi\n"
- " popl %edi\n"
- " popl %ebp\n"
- " popl %eax\n"
- /* Skip ds, es, fs, gs, orig_ax and ip */
- " addl $24, %esp\n"
+ RESTORE_REGS_STRING
" popf\n"
#endif
" ret\n");
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@...hat.com
--
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