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Message-Id: <1197674207.898.72.camel@brick>
Date: Fri, 14 Dec 2007 15:16:47 -0800
From: Harvey Harrison <harvey.harrison@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: "H. Peter Anvin" <hpa@...or.com>,
LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86: Unify cosmetic kprobes{32|64}.c
Introduces some temporary ifdefs and changes some cosmetic differences.
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
arch/x86/kernel/kprobes_32.c | 48 +++++++++++++++++++++++++++--------------
arch/x86/kernel/kprobes_64.c | 34 ++++++++++++++++++++++-------
2 files changed, 57 insertions(+), 25 deletions(-)
diff --git a/arch/x86/kernel/kprobes_32.c b/arch/x86/kernel/kprobes_32.c
index f4ba584..2a8acd6 100644
--- a/arch/x86/kernel/kprobes_32.c
+++ b/arch/x86/kernel/kprobes_32.c
@@ -234,7 +234,7 @@ static int __kprobes is_IF_modifier(kprobe_opcode_t opcode)
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
- /* insn: must be on special executable page on i386. */
+ /* insn: must be on special executable page on x86_32|64. */
p->ainsn.insn = get_insn_slot();
if (!p->ainsn.insn)
return -ENOMEM;
@@ -373,13 +373,21 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
static __always_inline void clear_btf(void)
{
if (test_thread_flag(TIF_DEBUGCTLMSR))
+#ifdef CONFIG_X86_32
wrmsr(MSR_IA32_DEBUGCTLMSR, 0, 0);
+#else
+ wrmsrl(MSR_IA32_DEBUGCTLMSR, 0);
+#endif
}
static __always_inline void restore_btf(void)
{
if (test_thread_flag(TIF_DEBUGCTLMSR))
+#ifdef CONFIG_X86_32
wrmsr(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr, 0);
+#else
+ wrmsrl(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr);
+#endif
}
static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
@@ -554,7 +562,7 @@ no_kprobe:
}
/*
- * Called from kretprobe_trampoline
+ * Called when we hit the probe point at kretprobe_trampoline
*/
void *__kprobes trampoline_handler(struct pt_regs *regs)
{
@@ -647,8 +655,8 @@ static void __kprobes resume_execution(struct kprobe *p,
struct pt_regs *regs, struct kprobe_ctlblk *kcb)
{
unsigned long *tos = (unsigned long *)®s->sp;
- unsigned long copy_eip = (unsigned long)p->ainsn.insn;
- unsigned long orig_eip = (unsigned long)p->addr;
+ unsigned long copy_ip = (unsigned long)p->ainsn.insn;
+ unsigned long orig_ip = (unsigned long)p->addr;
regs->flags &= ~TF_MASK;
switch (p->ainsn.insn[0]) {
@@ -666,10 +674,10 @@ static void __kprobes resume_execution(struct kprobe *p,
p->ainsn.boostable = 1;
goto no_change;
case 0xe8: /* call relative - Fix return addr */
- *tos = orig_eip + (*tos - copy_eip);
+ *tos = orig_ip + (*tos - copy_ip);
break;
case 0x9a: /* call absolute -- same as call absolute, indirect */
- *tos = orig_eip + (*tos - copy_eip);
+ *tos = orig_ip + (*tos - copy_ip);
goto no_change;
case 0xff:
if ((p->ainsn.insn[1] & 0x30) == 0x10) {
@@ -678,7 +686,7 @@ static void __kprobes resume_execution(struct kprobe *p,
* Fix return addr; ip is correct.
* But this is not boostable
*/
- *tos = orig_eip + (*tos - copy_eip);
+ *tos = orig_ip + (*tos - copy_ip);
goto no_change;
} else if (((p->ainsn.insn[1] & 0x31) == 0x20) || /* jmp near, absolute indirect */
((p->ainsn.insn[1] & 0x31) == 0x21)) { /* jmp far, absolute indirect */
@@ -691,26 +699,24 @@ static void __kprobes resume_execution(struct kprobe *p,
}
if (p->ainsn.boostable == 0) {
- if ((regs->ip > copy_eip) &&
- (regs->ip - copy_eip) + 5 < (MAX_INSN_SIZE + 1)) {
+ if ((regs->ip > copy_ip) &&
+ (regs->ip - copy_ip) + 5 < (MAX_INSN_SIZE + 1)) {
/*
* These instructions can be executed directly if it
* jumps back to correct address.
*/
set_jmp_op((void *)regs->ip,
- (void *)orig_eip + (regs->ip - copy_eip));
+ (void *)orig_ip + (regs->ip - copy_ip));
p->ainsn.boostable = 1;
} else {
p->ainsn.boostable = -1;
}
}
- regs->ip = orig_eip + (regs->ip - copy_eip);
+ regs->ip = orig_ip + (regs->ip - copy_ip);
no_change:
restore_btf();
-
- return;
}
/*
@@ -734,7 +740,7 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
regs->flags |= kcb->kprobe_saved_flags;
trace_hardirqs_fixup_flags(regs->flags);
- /*Restore back the original saved kprobes variables and continue. */
+ /* Restore the original saved kprobes variables and continue. */
if (kcb->kprobe_status == KPROBE_REENTER) {
restore_previous_kprobe(kcb);
goto out;
@@ -815,7 +821,7 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
}
/*
- * Wrapper routine to for handling exceptions.
+ * Wrapper routine for handling exceptions.
*/
int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data)
@@ -860,7 +866,7 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
addr = (unsigned long)(kcb->jprobe_saved_sp);
/*
- * TBD: As Linus pointed out, gcc assumes that the callee
+ * As Linus pointed out, gcc assumes that the callee
* owns the argument space and could overwrite it, e.g.
* tailcall optimization. So, to be absolutely safe
* we also save and restore enough stack bytes to cover
@@ -877,13 +883,21 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
void __kprobes jprobe_return(void)
{
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
+#ifdef CONFIG_X86_32
asm volatile (" xchgl %%ebx,%%esp \n"
" int3 \n"
" .globl jprobe_return_end \n"
" jprobe_return_end: \n"
" nop \n"::"b"
(kcb->jprobe_saved_sp):"memory");
+#else
+ asm volatile (" xchg %%rbx,%%rsp \n"
+ " int3 \n"
+ " .globl jprobe_return_end \n"
+ " jprobe_return_end: \n"
+ " nop \n"::"b"
+ (kcb->jprobe_saved_sp):"memory");
+#endif
}
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
diff --git a/arch/x86/kernel/kprobes_64.c b/arch/x86/kernel/kprobes_64.c
index 13a92ef..5f02e75 100644
--- a/arch/x86/kernel/kprobes_64.c
+++ b/arch/x86/kernel/kprobes_64.c
@@ -243,7 +243,7 @@ static int __kprobes is_IF_modifier(kprobe_opcode_t *insn)
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
- /* insn: must be on special executable page on x86_64. */
+ /* insn: must be on special executable page on x86_32|64. */
p->ainsn.insn = get_insn_slot();
if (!p->ainsn.insn) {
return -ENOMEM;
@@ -376,13 +376,21 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
static __always_inline void clear_btf(void)
{
if (test_thread_flag(TIF_DEBUGCTLMSR))
+#ifdef CONFIG_X86_32
+ wrmsr(MSR_IA32_DEBUGCTLMSR, 0, 0);
+#else
wrmsrl(MSR_IA32_DEBUGCTLMSR, 0);
+#endif
}
static __always_inline void restore_btf(void)
{
if (test_thread_flag(TIF_DEBUGCTLMSR))
+#ifdef CONFIG_X86_32
+ wrmsr(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr, 0);
+#else
wrmsrl(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr);
+#endif
}
static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
@@ -412,9 +420,11 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
{
struct kprobe *p;
int ret = 0;
- kprobe_opcode_t *addr = (kprobe_opcode_t *)(regs->ip - sizeof(kprobe_opcode_t));
+ kprobe_opcode_t *addr;
struct kprobe_ctlblk *kcb;
+ addr = (kprobe_opcode_t *)(regs->ip - sizeof(kprobe_opcode_t));
+
/*
* We don't want to be preempted for the entire
* duration of kprobe processing
@@ -616,8 +626,8 @@ static void __kprobes resume_execution(struct kprobe *p,
{
unsigned long *tos = (unsigned long *)regs->sp;
unsigned long next_rip = 0;
- unsigned long copy_rip = (unsigned long)p->ainsn.insn;
- unsigned long orig_rip = (unsigned long)p->addr;
+ unsigned long copy_ip = (unsigned long)p->ainsn.insn;
+ unsigned long orig_ip = (unsigned long)p->addr;
kprobe_opcode_t *insn = p->ainsn.insn;
/*skip the REX prefix*/
@@ -637,14 +647,14 @@ static void __kprobes resume_execution(struct kprobe *p,
/* ip is already adjusted, no more changes required*/
return;
case 0xe8: /* call relative - Fix return addr */
- *tos = orig_rip + (*tos - copy_rip);
+ *tos = orig_ip + (*tos - copy_ip);
break;
case 0xff:
if ((insn[1] & 0x30) == 0x10) {
/* call absolute, indirect */
/* Fix return addr; ip is correct. */
next_rip = regs->ip;
- *tos = orig_rip + (*tos - copy_rip);
+ *tos = orig_ip + (*tos - copy_ip);
} else if (((insn[1] & 0x31) == 0x20) || /* jmp near, absolute indirect */
((insn[1] & 0x31) == 0x21)) { /* jmp far, absolute indirect */
/* ip is correct. */
@@ -662,7 +672,7 @@ static void __kprobes resume_execution(struct kprobe *p,
if (next_rip) {
regs->ip = next_rip;
} else {
- regs->ip = orig_rip + (regs->ip - copy_rip);
+ regs->ip = orig_ip + (regs->ip - copy_ip);
}
restore_btf();
@@ -831,13 +841,21 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
void __kprobes jprobe_return(void)
{
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
-
+#ifdef CONFIG_X86_32
+ asm volatile (" xchgl %%ebx,%%esp \n"
+ " int3 \n"
+ " .globl jprobe_return_end \n"
+ " jprobe_return_end: \n"
+ " nop \n"::"b"
+ (kcb->jprobe_saved_sp):"memory");
+#else
asm volatile (" xchg %%rbx,%%rsp \n"
" int3 \n"
" .globl jprobe_return_end \n"
" jprobe_return_end: \n"
" nop \n"::"b"
(kcb->jprobe_saved_sp):"memory");
+#endif
}
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
--
1.5.4.rc0.1083.gf568
--
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