From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>
Subject: [patch V4 part 4 16/24] x86/entry: Convert Debug exception to IDTENTRY_DB
Date: Tue, 05 May 2020 15:49:42 +0200 [thread overview]
Message-ID: <20200505135314.900297476@linutronix.de> (raw)
In-Reply-To: 20200505134926.578885807@linutronix.de
Convert #DB to IDTENTRY_ERRORCODE:
- Implement the C entry point with DEFINE_IDTENTRY_DB
- Emit the ASM stub with DECLARE_IDTENTRY
- Remove the ASM idtentry in 64bit
- Remove the open coded ASM entry code in 32bit
- Fixup the XEN/PV code
- Remove the old prototyoes
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/entry/entry_32.S | 10 ----------
arch/x86/entry/entry_64.S | 2 --
arch/x86/include/asm/idtentry.h | 4 ++++
arch/x86/include/asm/traps.h | 3 ---
arch/x86/kernel/idt.c | 8 ++++----
arch/x86/kernel/traps.c | 21 +++++++++++++--------
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/xen-asm_64.S | 4 ++--
8 files changed, 24 insertions(+), 30 deletions(-)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1488,16 +1488,6 @@ SYM_CODE_START_LOCAL_NOALIGN(handle_exce
jmp restore_all_switch_stack
SYM_CODE_END(handle_exception)
-SYM_CODE_START(debug)
- /*
- * Entry from sysenter is now handled in common_exception
- */
- ASM_CLAC
- pushl $0
- pushl $do_debug
- jmp common_exception
-SYM_CODE_END(debug)
-
#ifdef CONFIG_DOUBLEFAULT
SYM_CODE_START(double_fault)
1:
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1075,12 +1075,10 @@ apicinterrupt IRQ_WORK_VECTOR irq_work
idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1
-idtentry_mce_db X86_TRAP_DB debug do_debug
idtentry_df X86_TRAP_DF double_fault do_double_fault
#ifdef CONFIG_XEN_PV
idtentry 512 /* dummy */ hypervisor_callback xen_do_hypervisor_callback has_error_code=0
-idtentry X86_TRAP_DB xendebug do_debug has_error_code=0
#endif
/*
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -262,4 +262,8 @@ DECLARE_IDTENTRY_MCE(X86_TRAP_MC, exc_ma
DECLARE_IDTENTRY_NMI(X86_TRAP_NMI, exc_nmi);
DECLARE_IDTENTRY_XEN(X86_TRAP_NMI, nmi);
+/* #DB */
+DECLARE_IDTENTRY_DEBUG(X86_TRAP_DB, exc_debug);
+DECLARE_IDTENTRY_XEN(X86_TRAP_DB, debug);
+
#endif
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -11,7 +11,6 @@
#define dotraplinkage __visible
-asmlinkage void debug(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
#endif
@@ -19,12 +18,10 @@ asmlinkage void page_fault(void);
asmlinkage void async_page_fault(void);
#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
-asmlinkage void xen_xendebug(void);
asmlinkage void xen_double_fault(void);
asmlinkage void xen_page_fault(void);
#endif
-dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
#if defined(CONFIG_X86_64) || defined(CONFIG_DOUBLEFAULT)
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
#endif
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -56,7 +56,7 @@ struct idt_data {
* stacks work only after cpu_init().
*/
static const __initconst struct idt_data early_idts[] = {
- INTG(X86_TRAP_DB, debug),
+ INTG(X86_TRAP_DB, asm_exc_debug),
SYSG(X86_TRAP_BP, asm_exc_int3),
#ifdef CONFIG_X86_32
INTG(X86_TRAP_PF, page_fault),
@@ -90,7 +90,7 @@ static const __initconst struct idt_data
#else
INTG(X86_TRAP_DF, double_fault),
#endif
- INTG(X86_TRAP_DB, debug),
+ INTG(X86_TRAP_DB, asm_exc_debug),
#ifdef CONFIG_X86_MCE
INTG(X86_TRAP_MC, asm_exc_machine_check),
@@ -161,7 +161,7 @@ static const __initconst struct idt_data
* stack set to DEFAULT_STACK (0). Required for NMI trap handling.
*/
static const __initconst struct idt_data dbg_idts[] = {
- INTG(X86_TRAP_DB, debug),
+ INTG(X86_TRAP_DB, asm_exc_debug),
};
#endif
@@ -182,7 +182,7 @@ gate_desc debug_idt_table[IDT_ENTRIES] _
* cpu_init() when the TSS has been initialized.
*/
static const __initconst struct idt_data ist_idts[] = {
- ISTG(X86_TRAP_DB, debug, IST_INDEX_DB),
+ ISTG(X86_TRAP_DB, asm_exc_debug, IST_INDEX_DB),
ISTG(X86_TRAP_NMI, asm_exc_nmi, IST_INDEX_NMI),
ISTG(X86_TRAP_DF, double_fault, IST_INDEX_DF),
#ifdef CONFIG_X86_MCE
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -753,7 +753,7 @@ static __always_inline void debug_exit(u
*
* May run on IST stack.
*/
-dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
+DEFINE_IDTENTRY_DEBUG(exc_debug)
{
struct task_struct *tsk = current;
unsigned long dr6, dr7;
@@ -762,7 +762,10 @@ dotraplinkage void do_debug(struct pt_re
debug_enter(&dr6, &dr7);
- nmi_enter();
+ if (user_mode(regs))
+ idtentry_enter(regs);
+ else
+ nmi_enter();
/*
* The SDM says "The processor clears the BTF flag when it
@@ -799,7 +802,7 @@ dotraplinkage void do_debug(struct pt_re
goto exit;
#endif
- if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code,
+ if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, 0,
SIGTRAP) == NOTIFY_STOP)
goto exit;
@@ -813,8 +816,8 @@ dotraplinkage void do_debug(struct pt_re
cond_local_irq_enable(regs);
if (v8086_mode(regs)) {
- handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code,
- X86_TRAP_DB);
+ handle_vm86_trap((struct kernel_vm86_regs *) regs, 0,
+ X86_TRAP_DB);
cond_local_irq_disable(regs);
debug_stack_usage_dec();
goto exit;
@@ -833,15 +836,17 @@ dotraplinkage void do_debug(struct pt_re
}
si_code = get_si_code(tsk->thread.debugreg6);
if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp)
- send_sigtrap(regs, error_code, si_code);
+ send_sigtrap(regs, 0, si_code);
cond_local_irq_disable(regs);
debug_stack_usage_dec();
exit:
- nmi_exit();
+ if (user_mode(regs))
+ idtentry_exit(regs);
+ else
+ nmi_exit();
debug_exit(dr7);
}
-NOKPROBE_SYMBOL(do_debug);
/*
* Note that we play around with the 'TS' bit in an attempt to get
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -616,7 +616,7 @@ struct trap_array_entry {
.ist_okay = ist_ok }
static struct trap_array_entry trap_array[] = {
- { debug, xen_xendebug, true },
+ TRAP_ENTRY_REDIR(exc_debug, exc_xendebug, true ),
{ double_fault, xen_double_fault, true },
#ifdef CONFIG_X86_MCE
TRAP_ENTRY(exc_machine_check, true ),
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -29,8 +29,8 @@ SYM_CODE_END(xen_\name)
.endm
xen_pv_trap asm_exc_divide_error
-xen_pv_trap debug
-xen_pv_trap xendebug
+xen_pv_trap asm_exc_debug
+xen_pv_trap asm_exc_xendebug
xen_pv_trap asm_exc_int3
xen_pv_trap asm_exc_xennmi
xen_pv_trap asm_exc_overflow
next prev parent reply other threads:[~2020-05-05 14:19 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 13:49 [patch V4 part 4 00/24] x86/entry: Entry/exception code rework, nasty exceptions Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 01/24] x86/int3: Ensure that poke_int3_handler() is not traced Thomas Gleixner
2020-05-14 4:57 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 02/24] x86/int3: Avoid atomic instrumentation Thomas Gleixner
2020-05-08 13:27 ` Masami Hiramatsu
2020-05-14 4:57 ` Andy Lutomirski
2020-05-14 9:32 ` Peter Zijlstra
2020-05-14 12:51 ` Thomas Gleixner
2020-05-14 13:15 ` Peter Zijlstra
2020-05-14 14:55 ` Andy Lutomirski
2020-05-14 15:06 ` Thomas Gleixner
2020-05-14 15:08 ` Andy Lutomirski
2020-05-14 15:10 ` Peter Zijlstra
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:49 ` [patch V4 part 4 03/24] lib/bsearch: Provide __always_inline variant Thomas Gleixner
2020-05-14 4:58 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:49 ` [patch V4 part 4 04/24] x86/int3: Inline bsearch() Thomas Gleixner
2020-05-14 4:58 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:49 ` [patch V4 part 4 05/24] x86/entry: Provide IDTENTRY_RAW Thomas Gleixner
2020-05-14 4:59 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] x86/idtentry: " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 06/24] x86/entry: Convert INT3 exception to IDTENTRY_RAW Thomas Gleixner
2020-05-14 5:01 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 07/24] x86/traps: Split int3 handler up Thomas Gleixner
2020-05-14 5:03 ` Andy Lutomirski
2020-05-14 9:39 ` Peter Zijlstra
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:49 ` [patch V4 part 4 08/24] x86/entry: Provide IDTENTRY_IST Thomas Gleixner
2020-05-14 16:39 ` Andy Lutomirski
2020-05-14 18:44 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] x86/idtentry: " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 09/24] x86/mce: Move nmi_enter/exit() into the entry point Thomas Gleixner
2020-05-15 5:23 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 10/24] x86/entry: Convert Machine Check to IDTENTRY_IST Thomas Gleixner
2020-05-15 5:24 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 11/24] x86/mce: Use untraced rd/wrmsr in the MCE offline/crash check Thomas Gleixner
2020-05-15 5:24 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 12/24] x86/idtentry: Provide IDTENTRY_XEN for XEN/PV Thomas Gleixner
2020-05-15 5:25 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 13/24] x86/entry: Convert NMI to IDTENTRY_NMI Thomas Gleixner
2020-05-15 5:26 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 14/24] x86/nmi: Protect NMI entry against instrumentation Thomas Gleixner
2020-05-15 5:26 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 15/24] x86/db: Split out dr6/7 handling Thomas Gleixner
2020-05-07 17:18 ` Alexandre Chartre
2020-05-08 8:59 ` Peter Zijlstra
2020-05-08 11:58 ` Thomas Gleixner
2020-05-08 12:45 ` Peter Zijlstra
2020-05-14 2:24 ` Mathieu Desnoyers
2020-05-14 17:28 ` Thomas Gleixner
2020-05-14 17:46 ` Mathieu Desnoyers
2020-05-15 14:32 ` Thomas Gleixner
2020-05-14 18:06 ` Steven Rostedt
2020-05-15 5:37 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2020-05-05 13:49 ` Thomas Gleixner [this message]
2020-05-15 5:27 ` [patch V4 part 4 16/24] x86/entry: Convert Debug exception to IDTENTRY_DB Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 17/24] x86/entry/64: Remove error code clearing from #DB and #MCE ASM stub Thomas Gleixner
2020-05-15 5:27 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 18/24] x86/entry: Provide IDTRENTRY_NOIST variants for #DB and #MC Thomas Gleixner
2020-05-15 5:29 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] x86/idtentry: " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 19/24] x86/entry: Implement user mode C entry points for #DB and #MCE Thomas Gleixner
2020-05-15 5:32 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 20/24] x86/traps: Restructure #DB handling Thomas Gleixner
2020-05-15 5:39 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 21/24] x86/traps: Address objtool noinstr complaints in #DB Thomas Gleixner
2020-05-15 5:39 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 22/24] x86/mce: Address objtools noinstr complaints Thomas Gleixner
2020-05-15 5:40 ` Andy Lutomirski
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 23/24] x86/entry: Provide IDTENTRY_DF Thomas Gleixner
2020-05-15 5:41 ` Andy Lutomirski
2020-05-15 15:01 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] x86/idtentry: " tip-bot2 for Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] x86/entry: Convert double fault exception to IDTENTRY_DF tip-bot2 for Thomas Gleixner
2020-05-05 13:49 ` [patch V4 part 4 24/24] " Thomas Gleixner
2020-05-07 19:55 ` Alexandre Chartre
2020-05-15 5:42 ` Andy Lutomirski
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