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Message-ID: <158991830089.17951.4794971518476962359.tip-bot2@tip-bot2>
Date: Tue, 19 May 2020 19:58:20 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Alexandre Chartre <alexandre.chartre@...cle.com>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>, x86 <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] x86/entry: Convert Debug exception to IDTENTRY_DB
The following commit has been merged into the x86/entry branch of tip:
Commit-ID: c087b87b1469166dbb0d757c7d79fecf14a90a0a
Gitweb: https://git.kernel.org/tip/c087b87b1469166dbb0d757c7d79fecf14a90a0a
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 25 Feb 2020 23:33:26 +01:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 19 May 2020 16:04:11 +02:00
x86/entry: Convert Debug exception to IDTENTRY_DB
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 prototypes
No functional change.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Acked-by: Andy Lutomirski <luto@...nel.org>
Link: https://lkml.kernel.org/r/20200505135314.900297476@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(-)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index d4961ca..30c6ed3 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1488,16 +1488,6 @@ ret_to_user:
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)
-
SYM_CODE_START(double_fault)
1:
/*
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 3d7f2cc..f47629a 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1074,12 +1074,10 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
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
/*
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 1f067e6..fcd4230 100644
--- 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_machine_check);
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
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 57b83ae..9bd602d 100644
--- 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);
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index d3fecd8..ddf3f3d 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -59,7 +59,7 @@ static bool idt_setup_done __initdata;
* 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),
@@ -93,7 +93,7 @@ static const __initconst struct idt_data def_idts[] = {
#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),
@@ -164,7 +164,7 @@ static const __initconst struct idt_data early_pf_idts[] = {
* 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
@@ -185,7 +185,7 @@ gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss;
* 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
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index de5120e..569408a 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -775,7 +775,7 @@ static __always_inline void debug_exit(unsigned long dr7)
*
* 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;
@@ -784,7 +784,10 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
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
@@ -821,7 +824,7 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
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;
@@ -835,8 +838,8 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
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;
@@ -855,15 +858,17 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
}
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
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index c65aa4c..535dde1 100644
--- 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 ),
diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 04fa01b..9999ea3 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -29,8 +29,8 @@ _ASM_NOKPROBE(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
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