The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: e99b6f46ee5c127d39d2f3a2682fdeef10386316
Gitweb: https://git.kernel.org/tip/e99b6f46ee5c127d39d2f3a2682fdeef10386316
Author: Andy Lutomirski <luto@xxxxxxxxxx>
AuthorDate: Thu, 21 Nov 2019 09:42:30 -08:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 26 Nov 2019 21:53:34 +01:00
x86/doublefault/32: Rename doublefault.c to doublefault_32.c
doublefault.c now only contains 32-bit code. Rename it to
doublefault_32.c.
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/Makefile | 4 +-
arch/x86/kernel/doublefault.c | 75 +-------------------------------
arch/x86/kernel/doublefault_32.c | 71 +++++++++++++++++++++++++++++-
3 files changed, 74 insertions(+), 76 deletions(-)
delete mode 100644 arch/x86/kernel/doublefault.c
create mode 100644 arch/x86/kernel/doublefault_32.c
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 32acb97..6175e37 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -100,7 +100,9 @@ obj-$(CONFIG_KEXEC_FILE) += kexec-bzimage64.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o
obj-y += kprobes/
obj-$(CONFIG_MODULES) += module.o
-obj-$(CONFIG_DOUBLEFAULT) += doublefault.o
+ifeq ($(CONFIG_X86_32),y)
+obj-$(CONFIG_DOUBLEFAULT) += doublefault_32.o
+endif
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_VM86) += vm86_32.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/x86/kernel/doublefault.c b/arch/x86/kernel/doublefault.c
deleted file mode 100644
index 0b3c616..0000000
--- a/arch/x86/kernel/doublefault.c
+++ /dev/null
@@ -1,75 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/init_task.h>
-#include <linux/fs.h>
-
-#include <linux/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <asm/desc.h>
-
-#ifdef CONFIG_X86_32
-
-#define DOUBLEFAULT_STACKSIZE (1024)
-static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
-#define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
-
-#define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + MAXMEM)
-
-static void doublefault_fn(void)
-{
- struct desc_ptr gdt_desc = {0, 0};
- unsigned long gdt, tss;
-
- native_store_gdt(&gdt_desc);
- gdt = gdt_desc.address;
-
- printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);
-
- if (ptr_ok(gdt)) {
- gdt += GDT_ENTRY_TSS << 3;
- tss = get_desc_base((struct desc_struct *)gdt);
- printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
-
- if (ptr_ok(tss)) {
- struct x86_hw_tss *t = (struct x86_hw_tss *)tss;
-
- printk(KERN_EMERG "eip = %08lx, esp = %08lx\n",
- t->ip, t->sp);
-
- printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
- t->ax, t->bx, t->cx, t->dx);
- printk(KERN_EMERG "esi = %08lx, edi = %08lx\n",
- t->si, t->di);
- }
- }
-
- for (;;)
- cpu_relax();
-}
-
-struct x86_hw_tss doublefault_tss __cacheline_aligned = {
- .sp0 = STACK_START,
- .ss0 = __KERNEL_DS,
- .ldt = 0,
- .io_bitmap_base = IO_BITMAP_OFFSET_INVALID,
-
- .ip = (unsigned long) doublefault_fn,
- /* 0x2 bit is always set */
- .flags = X86_EFLAGS_SF | 0x2,
- .sp = STACK_START,
- .es = __USER_DS,
- .cs = __KERNEL_CS,
- .ss = __KERNEL_DS,
- .ds = __USER_DS,
- .fs = __KERNEL_PERCPU,
-#ifndef CONFIG_X86_32_LAZY_GS
- .gs = __KERNEL_STACK_CANARY,
-#endif
-
- .__cr3 = __pa_nodebug(swapper_pg_dir),
-};
-
-#endif
diff --git a/arch/x86/kernel/doublefault_32.c b/arch/x86/kernel/doublefault_32.c
new file mode 100644
index 0000000..61c707c
--- /dev/null
+++ b/arch/x86/kernel/doublefault_32.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/init_task.h>
+#include <linux/fs.h>
+
+#include <linux/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/desc.h>
+
+#define DOUBLEFAULT_STACKSIZE (1024)
+static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
+#define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
+
+#define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + MAXMEM)
+
+static void doublefault_fn(void)
+{
+ struct desc_ptr gdt_desc = {0, 0};
+ unsigned long gdt, tss;
+
+ native_store_gdt(&gdt_desc);
+ gdt = gdt_desc.address;
+
+ printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);
+
+ if (ptr_ok(gdt)) {
+ gdt += GDT_ENTRY_TSS << 3;
+ tss = get_desc_base((struct desc_struct *)gdt);
+ printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
+
+ if (ptr_ok(tss)) {
+ struct x86_hw_tss *t = (struct x86_hw_tss *)tss;
+
+ printk(KERN_EMERG "eip = %08lx, esp = %08lx\n",
+ t->ip, t->sp);
+
+ printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
+ t->ax, t->bx, t->cx, t->dx);
+ printk(KERN_EMERG "esi = %08lx, edi = %08lx\n",
+ t->si, t->di);
+ }
+ }
+
+ for (;;)
+ cpu_relax();
+}
+
+struct x86_hw_tss doublefault_tss __cacheline_aligned = {
+ .sp0 = STACK_START,
+ .ss0 = __KERNEL_DS,
+ .ldt = 0,
+ .io_bitmap_base = IO_BITMAP_OFFSET_INVALID,
+
+ .ip = (unsigned long) doublefault_fn,
+ /* 0x2 bit is always set */
+ .flags = X86_EFLAGS_SF | 0x2,
+ .sp = STACK_START,
+ .es = __USER_DS,
+ .cs = __KERNEL_CS,
+ .ss = __KERNEL_DS,
+ .ds = __USER_DS,
+ .fs = __KERNEL_PERCPU,
+#ifndef CONFIG_X86_32_LAZY_GS
+ .gs = __KERNEL_STACK_CANARY,
+#endif
+
+ .__cr3 = __pa_nodebug(swapper_pg_dir),
+};
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