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-rw-r--r--Makefile5
-rw-r--r--arch/i386/defconfig2
-rw-r--r--arch/i386/kernel/entry.S32
-rw-r--r--arch/i386/kernel/traps.c83
-rw-r--r--arch/x86_64/Makefile2
-rw-r--r--arch/x86_64/defconfig2
-rw-r--r--arch/x86_64/kernel/entry.S33
-rw-r--r--arch/x86_64/kernel/traps.c84
-rw-r--r--arch/x86_64/kernel/vmlinux.lds.S2
-rw-r--r--include/asm-generic/vmlinux.lds.h22
-rw-r--r--include/asm-i386/unwind.h91
-rw-r--r--include/asm-x86_64/unwind.h96
-rw-r--r--include/linux/unwind.h63
-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/unwind.c1305
-rw-r--r--lib/Kconfig.debug18
-rw-r--r--lib/fault-inject.c32
17 files changed, 3 insertions, 1870 deletions
diff --git a/Makefile b/Makefile
index dc82462b68b..4a472038793 100644
--- a/Makefile
+++ b/Makefile
@@ -496,11 +496,6 @@ else
CFLAGS += -fomit-frame-pointer
endif
-ifdef CONFIG_UNWIND_INFO
-CFLAGS += -fasynchronous-unwind-tables
-LDFLAGS_vmlinux += --eh-frame-hdr
-endif
-
ifdef CONFIG_DEBUG_INFO
CFLAGS += -g
endif
diff --git a/arch/i386/defconfig b/arch/i386/defconfig
index 3265208e589..e075ff05c46 100644
--- a/arch/i386/defconfig
+++ b/arch/i386/defconfig
@@ -1493,8 +1493,6 @@ CONFIG_DEBUG_BUGVERBOSE=y
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_FRAME_POINTER is not set
-CONFIG_UNWIND_INFO=y
-CONFIG_STACK_UNWIND=y
# CONFIG_FORCED_INLINING is not set
# CONFIG_HEADERS_CHECK is not set
# CONFIG_RCU_TORTURE_TEST is not set
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index de34b7fed3c..06461b8b715 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -979,38 +979,6 @@ ENTRY(spurious_interrupt_bug)
jmp error_code
CFI_ENDPROC
-#ifdef CONFIG_STACK_UNWIND
-ENTRY(arch_unwind_init_running)
- CFI_STARTPROC
- movl 4(%esp), %edx
- movl (%esp), %ecx
- leal 4(%esp), %eax
- movl %ebx, PT_EBX(%edx)
- xorl %ebx, %ebx
- movl %ebx, PT_ECX(%edx)
- movl %ebx, PT_EDX(%edx)
- movl %esi, PT_ESI(%edx)
- movl %edi, PT_EDI(%edx)
- movl %ebp, PT_EBP(%edx)
- movl %ebx, PT_EAX(%edx)
- movl $__USER_DS, PT_DS(%edx)
- movl $__USER_DS, PT_ES(%edx)
- movl $0, PT_GS(%edx)
- movl %ebx, PT_ORIG_EAX(%edx)
- movl %ecx, PT_EIP(%edx)
- movl 12(%esp), %ecx
- movl $__KERNEL_CS, PT_CS(%edx)
- movl %ebx, PT_EFLAGS(%edx)
- movl %eax, PT_OLDESP(%edx)
- movl 8(%esp), %eax
- movl %ecx, 8(%esp)
- movl PT_EBX(%edx), %ebx
- movl $__KERNEL_DS, PT_OLDSS(%edx)
- jmpl *%eax
- CFI_ENDPROC
-ENDPROC(arch_unwind_init_running)
-#endif
-
ENTRY(kernel_thread_helper)
pushl $0 # fake return address for unwinder
CFI_STARTPROC
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 2b30dbf8d11..0efad8aeb41 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -94,11 +94,6 @@ asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
int kstack_depth_to_print = 24;
-#ifdef CONFIG_STACK_UNWIND
-static int call_trace = 1;
-#else
-#define call_trace (-1)
-#endif
ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb)
@@ -152,33 +147,6 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
return ebp;
}
-struct ops_and_data {
- struct stacktrace_ops *ops;
- void *data;
-};
-
-static asmlinkage int
-dump_trace_unwind(struct unwind_frame_info *info, void *data)
-{
- struct ops_and_data *oad = (struct ops_and_data *)data;
- int n = 0;
- unsigned long sp = UNW_SP(info);
-
- if (arch_unw_user_mode(info))
- return -1;
- while (unwind(info) == 0 && UNW_PC(info)) {
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1))
- && sp > UNW_SP(info))
- break;
- sp = UNW_SP(info);
- }
- return n;
-}
-
#define MSG(msg) ops->warning(data, msg)
void dump_trace(struct task_struct *task, struct pt_regs *regs,
@@ -190,41 +158,6 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
if (!task)
task = current;
- if (call_trace >= 0) {
- int unw_ret = 0;
- struct unwind_frame_info info;
- struct ops_and_data oad = { .ops = ops, .data = data };
-
- if (regs) {
- if (unwind_init_frame_info(&info, task, regs) == 0)
- unw_ret = dump_trace_unwind(&info, &oad);
- } else if (task == current)
- unw_ret = unwind_init_running(&info, dump_trace_unwind,
- &oad);
- else {
- if (unwind_init_blocked(&info, task) == 0)
- unw_ret = dump_trace_unwind(&info, &oad);
- }
- if (unw_ret > 0) {
- if (call_trace == 1 && !arch_unw_user_mode(&info)) {
- ops->warning_symbol(data,
- "DWARF2 unwinder stuck at %s",
- UNW_PC(&info));
- if (UNW_SP(&info) >= PAGE_OFFSET) {
- MSG("Leftover inexact backtrace:");
- stack = (void *)UNW_SP(&info);
- if (!stack)
- return;
- ebp = UNW_FP(&info);
- } else
- MSG("Full inexact backtrace again:");
- } else if (call_trace >= 1)
- return;
- else
- MSG("Full inexact backtrace again:");
- } else
- MSG("Inexact backtrace:");
- }
if (!stack) {
unsigned long dummy;
stack = &dummy;
@@ -1258,19 +1191,3 @@ static int __init kstack_setup(char *s)
return 1;
}
__setup("kstack=", kstack_setup);
-
-#ifdef CONFIG_STACK_UNWIND
-static int __init call_trace_setup(char *s)
-{
- if (strcmp(s, "old") == 0)
- call_trace = -1;
- else if (strcmp(s, "both") == 0)
- call_trace = 0;
- else if (strcmp(s, "newfallback") == 0)
- call_trace = 1;
- else if (strcmp(s, "new") == 2)
- call_trace = 2;
- return 1;
-}
-__setup("call_trace=", call_trace_setup);
-#endif
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index b471b8550d0..2941a915d4e 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -45,9 +45,7 @@ cflags-kernel-$(CONFIG_REORDER) += -ffunction-sections
# actually it makes the kernel smaller too.
cflags-y += -fno-reorder-blocks
cflags-y += -Wno-sign-compare
-ifneq ($(CONFIG_UNWIND_INFO),y)
cflags-y += -fno-asynchronous-unwind-tables
-endif
ifneq ($(CONFIG_DEBUG_INFO),y)
# -fweb shrinks the kernel a bit, but the difference is very small
# it also messes up debugging, so don't use it for now.
diff --git a/arch/x86_64/defconfig b/arch/x86_64/defconfig
index 1a1c6a1a299..ac80b1209fc 100644
--- a/arch/x86_64/defconfig
+++ b/arch/x86_64/defconfig
@@ -1523,8 +1523,6 @@ CONFIG_DEBUG_FS=y
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_FRAME_POINTER is not set
-CONFIG_UNWIND_INFO=y
-CONFIG_STACK_UNWIND=y
# CONFIG_FORCED_INLINING is not set
# CONFIG_HEADERS_CHECK is not set
# CONFIG_RCU_TORTURE_TEST is not set
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 601d332c4b7..9f5dac64aa8 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -1155,36 +1155,3 @@ ENTRY(call_softirq)
ret
CFI_ENDPROC
ENDPROC(call_softirq)
-
-#ifdef CONFIG_STACK_UNWIND
-ENTRY(arch_unwind_init_running)
- CFI_STARTPROC
- movq %r15, R15(%rdi)
- movq %r14, R14(%rdi)
- xchgq %rsi, %rdx
- movq %r13, R13(%rdi)
- movq %r12, R12(%rdi)
- xorl %eax, %eax
- movq %rbp, RBP(%rdi)
- movq %rbx, RBX(%rdi)
- movq (%rsp), %rcx
- movq %rax, R11(%rdi)
- movq %rax, R10(%rdi)
- movq %rax, R9(%rdi)
- movq %rax, R8(%rdi)
- movq %rax, RAX(%rdi)
- movq %rax, RCX(%rdi)
- movq %rax, RDX(%rdi)
- movq %rax, RSI(%rdi)
- movq %rax, RDI(%rdi)
- movq %rax, ORIG_RAX(%rdi)
- movq %rcx, RIP(%rdi)
- leaq 8(%rsp), %rcx
- movq $__KERNEL_CS, CS(%rdi)
- movq %rax, EFLAGS(%rdi)
- movq %rcx, RSP(%rdi)
- movq $__KERNEL_DS, SS(%rdi)
- jmpq *%rdx
- CFI_ENDPROC
-ENDPROC(arch_unwind_init_running)
-#endif
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index b54ccc07f37..1d9eb6db732 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -110,11 +110,6 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
}
int kstack_depth_to_print = 12;
-#ifdef CONFIG_STACK_UNWIND
-static int call_trace = 1;
-#else
-#define call_trace (-1)
-#endif
#ifdef CONFIG_KALLSYMS
void printk_address(unsigned long address)
@@ -217,32 +212,6 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
return NULL;
}
-struct ops_and_data {
- struct stacktrace_ops *ops;
- void *data;
-};
-
-static int dump_trace_unwind(struct unwind_frame_info *info, void *context)
-{
- struct ops_and_data *oad = (struct ops_and_data *)context;
- int n = 0;
- unsigned long sp = UNW_SP(info);
-
- if (arch_unw_user_mode(info))
- return -1;
- while (unwind(info) == 0 && UNW_PC(info)) {
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1))
- && sp > UNW_SP(info))
- break;
- sp = UNW_SP(info);
- }
- return n;
-}
-
#define MSG(txt) ops->warning(data, txt)
/*
@@ -270,40 +239,6 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
if (!tsk)
tsk = current;
- if (call_trace >= 0) {
- int unw_ret = 0;
- struct unwind_frame_info info;
- struct ops_and_data oad = { .ops = ops, .data = data };
-
- if (regs) {
- if (unwind_init_frame_info(&info, tsk, regs) == 0)
- unw_ret = dump_trace_unwind(&info, &oad);
- } else if (tsk == current)
- unw_ret = unwind_init_running(&info, dump_trace_unwind,
- &oad);
- else {
- if (unwind_init_blocked(&info, tsk) == 0)
- unw_ret = dump_trace_unwind(&info, &oad);
- }
- if (unw_ret > 0) {
- if (call_trace == 1 && !arch_unw_user_mode(&info)) {
- ops->warning_symbol(data,
- "DWARF2 unwinder stuck at %s",
- UNW_PC(&info));
- if ((long)UNW_SP(&info) < 0) {
- MSG("Leftover inexact backtrace:");
- stack = (unsigned long *)UNW_SP(&info);
- if (!stack)
- goto out;
- } else
- MSG("Full inexact backtrace again:");
- } else if (call_trace >= 1)
- goto out;
- else
- MSG("Full inexact backtrace again:");
- } else
- MSG("Inexact backtrace:");
- }
if (!stack) {
unsigned long dummy;
stack = &dummy;
@@ -387,7 +322,6 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
tinfo = current_thread_info();
HANDLE_STACK (valid_stack_ptr(tinfo, stack));
#undef HANDLE_STACK
-out:
put_cpu();
}
EXPORT_SYMBOL(dump_trace);
@@ -1188,21 +1122,3 @@ static int __init kstack_setup(char *s)
return 0;
}
early_param("kstack", kstack_setup);
-
-#ifdef CONFIG_STACK_UNWIND
-static int __init call_trace_setup(char *s)
-{
- if (!s)
- return -EINVAL;
- if (strcmp(s, "old") == 0)
- call_trace = -1;
- else if (strcmp(s, "both") == 0)
- call_trace = 0;
- else if (strcmp(s, "newfallback") == 0)
- call_trace = 1;
- else if (strcmp(s, "new") == 0)
- call_trace = 2;
- return 0;
-}
-early_param("call_trace", call_trace_setup);
-#endif
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index 514be5dd230..1e54ddf2338 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -221,9 +221,7 @@ SECTIONS
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
-#ifndef CONFIG_UNWIND_INFO
*(.eh_frame)
-#endif
}
STABS_DEBUG
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 7437ccaada7..1587121730c 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -119,8 +119,6 @@
*(__ksymtab_strings) \
} \
\
- EH_FRAME \
- \
/* Built-in module parameters. */ \
__param : AT(ADDR(__param) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start___param) = .; \
@@ -160,26 +158,6 @@
*(.kprobes.text) \
VMLINUX_SYMBOL(__kprobes_text_end) = .;
-#ifdef CONFIG_STACK_UNWIND
-#define EH_FRAME \
- /* Unwind data binary search table */ \
- . = ALIGN(8); \
- .eh_frame_hdr : AT(ADDR(.eh_frame_hdr) - LOAD_OFFSET) { \
- VMLINUX_SYMBOL(__start_unwind_hdr) = .; \
- *(.eh_frame_hdr) \
- VMLINUX_SYMBOL(__end_unwind_hdr) = .; \
- } \
- /* Unwind data */ \
- . = ALIGN(8); \
- .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) { \
- VMLINUX_SYMBOL(__start_unwind) = .; \
- *(.eh_frame) \
- VMLINUX_SYMBOL(__end_unwind) = .; \
- }
-#else
-#define EH_FRAME
-#endif
-
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to
the beginning of the section so we begin them at 0. */
diff --git a/include/asm-i386/unwind.h b/include/asm-i386/unwind.h
index aa2c931e30d..43c70c3de2f 100644
--- a/include/asm-i386/unwind.h
+++ b/include/asm-i386/unwind.h
@@ -1,95 +1,6 @@
#ifndef _ASM_I386_UNWIND_H
#define _ASM_I386_UNWIND_H
-/*
- * Copyright (C) 2002-2006 Novell, Inc.
- * Jan Beulich <jbeulich@novell.com>
- * This code is released under version 2 of the GNU GPL.
- */
-
-#ifdef CONFIG_STACK_UNWIND
-
-#include <linux/sched.h>
-#include <asm/fixmap.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-
-struct unwind_frame_info
-{
- struct pt_regs regs;
- struct task_struct *task;
- unsigned call_frame:1;
-};
-
-#define UNW_PC(frame) (frame)->regs.eip
-#define UNW_SP(frame) (frame)->regs.esp
-#ifdef CONFIG_FRAME_POINTER
-#define UNW_FP(frame) (frame)->regs.ebp
-#define FRAME_RETADDR_OFFSET 4
-#define FRAME_LINK_OFFSET 0
-#define STACK_BOTTOM(tsk) STACK_LIMIT((tsk)->thread.esp0)
-#define STACK_TOP(tsk) ((tsk)->thread.esp0)
-#else
-#define UNW_FP(frame) ((void)(frame), 0)
-#endif
-#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
-
-#define UNW_REGISTER_INFO \
- PTREGS_INFO(eax), \
- PTREGS_INFO(ecx), \
- PTREGS_INFO(edx), \
- PTREGS_INFO(ebx), \
- PTREGS_INFO(esp), \
- PTREGS_INFO(ebp), \
- PTREGS_INFO(esi), \
- PTREGS_INFO(edi), \
- PTREGS_INFO(eip)
-
-#define UNW_DEFAULT_RA(raItem, dataAlign) \
- ((raItem).where == Memory && \
- !((raItem).value * (dataAlign) + 4))
-
-static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
- /*const*/ struct pt_regs *regs)
-{
- if (user_mode_vm(regs))
- info->regs = *regs;
- else {
- memcpy(&info->regs, regs, offsetof(struct pt_regs, esp));
- info->regs.esp = (unsigned long)&regs->esp;
- info->regs.xss = __KERNEL_DS;
- }
-}
-
-static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
-{
- memset(&info->regs, 0, sizeof(info->regs));
- info->regs.eip = info->task->thread.eip;
- info->regs.xcs = __KERNEL_CS;
- __get_user(info->regs.ebp, (long *)info->task->thread.esp);
- info->regs.esp = info->task->thread.esp;
- info->regs.xss = __KERNEL_DS;
- info->regs.xds = __USER_DS;
- info->regs.xes = __USER_DS;
- info->regs.xgs = __KERNEL_PDA;
-}
-
-extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *,
- asmlinkage int (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg);
-
-static inline int arch_unw_user_mode(/*const*/ struct unwind_frame_info *info)
-{
- return user_mode_vm(&info->regs)
- || info->regs.eip < PAGE_OFFSET
- || (info->regs.eip >= __fix_to_virt(FIX_VDSO)
- && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
- || info->regs.esp < PAGE_OFFSET;
-}
-
-#else
-
#define UNW_PC(frame) ((void)(frame), 0)
#define UNW_SP(frame) ((void)(frame), 0)
#define UNW_FP(frame) ((void)(frame), 0)
@@ -99,6 +10,4 @@ static inline int arch_unw_user_mode(const void *info)
return 0;
}
-#endif
-
#endif /* _ASM_I386_UNWIND_H */
diff --git a/include/asm-x86_64/unwind.h b/include/asm-x86_64/unwind.h
index 2f6349e4871..02710f6a456 100644
--- a/include/asm-x86_64/unwind.h
+++ b/include/asm-x86_64/unwind.h
@@ -1,100 +1,6 @@
#ifndef _ASM_X86_64_UNWIND_H
#define _ASM_X86_64_UNWIND_H
-/*
- * Copyright (C) 2002-2006 Novell, Inc.
- * Jan Beulich <jbeulich@novell.com>
- * This code is released under version 2 of the GNU GPL.
- */
-
-#ifdef CONFIG_STACK_UNWIND
-
-#include <linux/sched.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-#include <asm/vsyscall.h>
-
-struct unwind_frame_info
-{
- struct pt_regs regs;
- struct task_struct *task;
- unsigned call_frame:1;
-};
-
-#define UNW_PC(frame) (frame)->regs.rip
-#define UNW_SP(frame) (frame)->regs.rsp
-#ifdef CONFIG_FRAME_POINTER
-#define UNW_FP(frame) (frame)->regs.rbp
-#define FRAME_RETADDR_OFFSET 8
-#define FRAME_LINK_OFFSET 0
-#define STACK_BOTTOM(tsk) (((tsk)->thread.rsp0 - 1) & ~(THREAD_SIZE - 1))
-#define STACK_TOP(tsk) ((tsk)->thread.rsp0)
-#endif
-/* Might need to account for the special exception and interrupt handling
- stacks here, since normally
- EXCEPTION_STACK_ORDER < THREAD_ORDER < IRQSTACK_ORDER,
- but the construct is needed only for getting across the stack switch to
- the interrupt stack - thus considering the IRQ stack itself is unnecessary,
- and the overhead of comparing against all exception handling stacks seems
- not desirable. */
-#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
-
-#define UNW_REGISTER_INFO \
- PTREGS_INFO(rax), \
- PTREGS_INFO(rdx), \
- PTREGS_INFO(rcx), \
- PTREGS_INFO(rbx), \
- PTREGS_INFO(rsi), \
- PTREGS_INFO(rdi), \
- PTREGS_INFO(rbp), \
- PTREGS_INFO(rsp), \
- PTREGS_INFO(r8), \
- PTREGS_INFO(r9), \
- PTREGS_INFO(r10), \
- PTREGS_INFO(r11), \
- PTREGS_INFO(r12), \
- PTREGS_INFO(r13), \
- PTREGS_INFO(r14), \
- PTREGS_INFO(r15), \
- PTREGS_INFO(rip)
-
-#define UNW_DEFAULT_RA(raItem, dataAlign) \
- ((raItem).where == Memory && \
- !((raItem).value * (dataAlign) + 8))
-
-static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
- /*const*/ struct pt_regs *regs)
-{
- info->regs = *regs;
-}
-
-static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
-{
- extern const char thread_return[];
-
- memset(&info->regs, 0, sizeof(info->regs));
- info->regs.rip = (unsigned long)thread_return;
- info->regs.cs = __KERNEL_CS;
- __get_user(info->regs.rbp, (unsigned long *)info->task->thread.rsp);
- info->regs.rsp = info->task->thread.rsp;
- info->regs.ss = __KERNEL_DS;
-}
-
-extern int arch_unwind_init_running(struct unwind_frame_info *,
- int (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg);
-
-static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
-{
- return user_mode(&info->regs)
- || (long)info->regs.rip >= 0
- || (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
- || (long)info->regs.rsp >= 0;
-}
-
-#else
-
#define UNW_PC(frame) ((void)(frame), 0UL)
#define UNW_SP(frame) ((void)(frame), 0UL)
@@ -103,6 +9,4 @@ static inline int arch_unw_user_mode(const void *info)
return 0;
}
-#endif
-
#endif /* _ASM_X86_64_UNWIND_H */
diff --git a/include/linux/unwind.h b/include/linux/unwind.h
index 749928c161f..7760860fa17 100644
--- a/include/linux/unwind.h
+++ b/include/linux/unwind.h
@@ -14,63 +14,6 @@
struct module;
-#ifdef CONFIG_STACK_UNWIND
-
-#include <asm/unwind.h>
-
-#ifndef ARCH_UNWIND_SECTION_NAME
-#define ARCH_UNWIND_SECTION_NAME ".eh_frame"
-#endif
-
-/*
- * Initialize unwind support.
- */
-extern void unwind_init(void);
-extern void unwind_setup(void);
-
-#ifdef CONFIG_MODULES
-
-extern void *unwind_add_table(struct module *,
- const void *table_start,
- unsigned long table_size);
-
-extern void unwind_remove_table(void *handle, int init_only);
-
-#endif
-
-extern int unwind_init_frame_info(struct unwind_frame_info *,
- struct task_struct *,
- /*const*/ struct pt_regs *);
-
-/*
- * Prepare to unwind a blocked task.
- */
-extern int unwind_init_blocked(struct unwind_frame_info *,
- struct task_struct *);
-
-/*
- * Prepare to unwind the currently running thread.
- */
-extern int unwind_init_running(struct unwind_frame_info *,
- asmlinkage int (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg);
-
-/*
- * Unwind to previous to frame. Returns 0 if successful, negative
- * number in case of an error.
- */
-extern int unwind(struct unwind_frame_info *);
-
-/*
- * Unwind until the return pointer is in user-land (or until an error
- * occurs). Returns 0 if successful, negative number in case of
- * error.
- */
-extern int unwind_to_user(struct unwind_frame_info *);
-
-#else
-
struct unwind_frame_info {};
static inline void unwind_init(void) {}
@@ -85,12 +28,12 @@ static inline void *unwind_add_table(struct module *mod,
return NULL;
}
-#endif
-
static inline void unwind_remove_table(void *handle, int init_only)
{
}
+#endif
+
static inline int unwind_init_frame_info(struct unwind_frame_info *info,
struct task_struct *tsk,
const struct pt_regs *regs)
@@ -122,6 +65,4 @@ static inline int unwind_to_user(struct unwind_frame_info *info)
return -ENOSYS;
}
-#endif
-
#endif /* _LINUX_UNWIND_H */
diff --git a/kernel/Makefile b/kernel/Makefile
index 5e3f3b75563..14f4d45e0ae 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -31,7 +31,6 @@ obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
-obj-$(CONFIG_STACK_UNWIND) += unwind.o
obj-$(CONFIG_PM) += power/
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC) += kexec.o
diff --git a/kernel/unwind.c b/kernel/unwind.c
deleted file mode 100644
index 09c26132924..00000000000
--- a/kernel/unwind.c
+++ /dev/null
@@ -1,1305 +0,0 @@
-/*
- * Copyright (C) 2002-2006 Novell, Inc.
- * Jan Beulich <jbeulich@novell.com>
- * This code is released under version 2 of the GNU GPL.
- *
- * A simple API for unwinding kernel stacks. This is used for
- * debugging and error reporting purposes. The kernel doesn't need
- * full-blown stack unwinding with all the bells and whistles, so there
- * is not much point in implementing the full Dwarf2 unwind API.
- */
-
-#include <linux/unwind.h>
-#include <linux/module.h>
-#include <linux/bootmem.h>
-#include <linux/sort.h>
-#include <linux/stop_machine.h>
-#include <linux/uaccess.h>
-#include <asm/sections.h>
-#include <asm/uaccess.h>
-#include <asm/unaligned.h>
-
-extern const char __start_unwind[], __end_unwind[];
-extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];
-
-#define MAX_STACK_DEPTH 8
-
-#define EXTRA_INFO(f) { \
- BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \
- % FIELD_SIZEOF(struct unwind_frame_info, f)) \
- + offsetof(struct unwind_frame_info, f) \
- / FIELD_SIZEOF(struct unwind_frame_info, f), \
- FIELD_SIZEOF(struct unwind_frame_info, f) \
- }
-#define PTREGS_INFO(f) EXTRA_INFO(regs.f)
-
-static const struct {
- unsigned offs:BITS_PER_LONG / 2;
- unsigned width:BITS_PER_LONG / 2;
-} reg_info[] = {
- UNW_REGISTER_INFO
-};
-
-#undef PTREGS_INFO
-#undef EXTRA_INFO
-
-#ifndef REG_INVALID
-#define REG_INVALID(r) (reg_info[r].width == 0)
-#endif
-
-#define DW_CFA_nop 0x00
-#define DW_CFA_set_loc 0x01
-#define DW_CFA_advance_loc1 0x02
-#define DW_CFA_advance_loc2 0x03
-#define DW_CFA_advance_loc4 0x04
-#define DW_CFA_offset_extended 0x05
-#define DW_CFA_restore_extended 0x06
-#define DW_CFA_undefined 0x07
-#define DW_CFA_same_value 0x08
-#define DW_CFA_register 0x09
-#define DW_CFA_remember_state 0x0a
-#define DW_CFA_restore_state 0x0b
-#define DW_CFA_def_cfa 0x0c
-#define DW_CFA_def_cfa_register 0x0d
-#define DW_CFA_def_cfa_offset 0x0e
-#define DW_CFA_def_cfa_expression 0x0f
-#define DW_CFA_expression 0x10
-#define DW_CFA_offset_extended_sf 0x11
-#define DW_CFA_def_cfa_sf 0x12
-#define DW_CFA_def_cfa_offset_sf 0x13
-#define DW_CFA_val_offset 0x14
-#define DW_CFA_val_offset_sf 0x15
-#define DW_CFA_val_expression 0x16
-#define DW_CFA_lo_user 0x1c
-#define DW_CFA_GNU_window_save 0x2d
-#define DW_CFA_GNU_args_size 0x2e
-#define DW_CFA_GNU_negative_offset_extended 0x2f
-#define DW_CFA_hi_user 0x3f
-
-#define DW_EH_PE_FORM 0x07
-#define DW_EH_PE_native 0x00
-#define DW_EH_PE_leb128 0x01
-#define DW_EH_PE_data2 0x02
-#define DW_EH_PE_data4 0x03
-#define DW_EH_PE_data8 0x04
-#define DW_EH_PE_signed 0x08
-#define DW_EH_PE_ADJUST 0x70
-#define DW_EH_PE_abs 0x00
-#define DW_EH_PE_pcrel 0x10
-#define DW_EH_PE_textrel 0x20
-#define DW_EH_PE_datarel 0x30
-#define DW_EH_PE_funcrel 0x40
-#define DW_EH_PE_aligned 0x50
-#define DW_EH_PE_indirect 0x80
-#define DW_EH_PE_omit 0xff
-
-typedef unsigned long uleb128_t;
-typedef signed long sleb128_t;
-#define sleb128abs __builtin_labs
-
-static struct unwind_table {
- struct {
- unsigned long pc;
- unsigned long range;
- } core, init;
- const void *address;
- unsigned long size;
- const unsigned char *header;
- unsigned long hdrsz;
- struct unwind_table *link;
- const char *name;
-} root_table;
-
-struct unwind_item {
- enum item_location {
- Nowhere,
- Memory,
- Register,
- Value
- } where;
- uleb128_t value;
-};
-
-struct unwind_state {
- uleb128_t loc, org;
- const u8 *cieStart, *cieEnd;
- uleb128_t codeAlign;
- sleb128_t dataAlign;
- struct cfa {
- uleb128_t reg, offs;
- } cfa;
- struct unwind_item regs[ARRAY_SIZE(reg_info)];
- unsigned stackDepth:8;
- unsigned version:8;
- const u8 *label;
- const u8 *stack[MAX_STACK_DEPTH];
-};
-
-static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };
-
-static unsigned unwind_debug;
-static int __init unwind_debug_setup(char *s)
-{
- unwind_debug = simple_strtoul(s, NULL, 0);
- return 1;
-}
-__setup("unwind_debug=", unwind_debug_setup);
-#define dprintk(lvl, fmt, args...) \
- ((void)(lvl > unwind_debug \
- || printk(KERN_DEBUG "unwind: " fmt "\n", ##args)))
-
-static struct unwind_table *find_table(unsigned long pc)
-{
- struct unwind_table *table;
-
- for (table = &root_table; table; table = table->link)
- if ((pc >= table->core.pc
- && pc < table->core.pc + table->core.range)
- || (pc >= table->init.pc
- && pc < table->init.pc + table->init.range))
- break;
-
- return table;
-}
-
-static unsigned long read_pointer(const u8 **pLoc,
- const void *end,
- signed ptrType,
- unsigned long text_base,
- unsigned long data_base);
-
-static void init_unwind_table(struct unwind_table *table,
- const char *name,
- const void *core_start,
- unsigned long core_size,
- const void *init_start,
- unsigned long init_size,
- const void *table_start,
- unsigned long table_size,
- const u8 *header_start,
- unsigned long header_size)
-{
- const u8 *ptr = header_start + 4;
- const u8 *end = header_start + header_size;
-
- table->core.pc = (unsigned long)core_start;
- table->core.range = core_size;
- table->init.pc = (unsigned long)init_start;
- table->init.range = init_size;
- table->address = table_start;
- table->size = table_size;
- /* See if the linker provided table looks valid. */
- if (header_size <= 4
- || header_start[0] != 1
- || (void *)read_pointer(&ptr, end, header_start[1], 0, 0)
- != table_start
- || !read_pointer(&ptr, end, header_start[2], 0, 0)
- || !read_pointer(&ptr, end, header_start[3], 0,
- (unsigned long)header_start)
- || !read_pointer(&ptr, end, header_start[3], 0,
- (unsigned long)header_start))
- header_start = NULL;
- table->hdrsz = header_size;
- smp_wmb();
- table->header = header_start;
- table->link = NULL;
- table->name = name;
-}
-
-void __init unwind_init(void)
-{
- init_unwind_table(&root_table, "kernel",
- _text, _end - _text,
- NULL, 0,
- __start_unwind, __end_unwind - __start_unwind,
- __start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);
-}
-
-static const u32 bad_cie, not_fde;
-static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *);
-static signed fde_pointer_type(const u32 *cie);
-
-struct eh_frame_hdr_table_entry {
- unsigned long start, fde;
-};
-
-static int cmp_eh_frame_hdr_table_entries(const void *p1, const void *p2)
-{
- const struct eh_frame_hdr_table_entry *e1 = p1;
- const struct eh_frame_hdr_table_entry *e2 = p2;
-
- return (e1->start > e2->start) - (e1->start < e2->start);
-}
-
-static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size)
-{
- struct eh_frame_hdr_table_entry *e1 = p1;
- struct eh_frame_hdr_table_entry *e2 = p2;
- unsigned long v;
-
- v = e1->start;
- e1->start = e2->start;
- e2->start = v;
- v = e1->fde;
- e1->fde = e2->fde;
- e2->fde = v;
-}
-
-static void __init setup_unwind_table(struct unwind_table *table,
- void *(*alloc)(unsigned long))
-{
- const u8 *ptr;
- unsigned long tableSize = table->size, hdrSize;
- unsigned n;
- const u32 *fde;
- struct {
- u8 version;
- u8 eh_frame_ptr_enc;
- u8 fde_count_enc;
- u8 table_enc;
- unsigned long eh_frame_ptr;
- unsigned int fde_count;
- struct eh_frame_hdr_table_entry table[];
- } __attribute__((__packed__)) *header;
-
- if (table->header)
- return;
-
- if (table->hdrsz)
- printk(KERN_WARNING ".eh_frame_hdr for '%s' present but unusable\n",
- table->name);
-
- if (tableSize & (sizeof(*fde) - 1))
- return;
-
- for (fde = table->address, n = 0;
- tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde;
- tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) {
- const u32 *cie = cie_for_fde(fde, table);
- signed ptrType;
-
- if (cie == &not_fde)
- continue;
- if (cie == NULL
- || cie == &bad_cie
- || (ptrType = fde_pointer_type(cie)) < 0)
- return;
- ptr = (const u8 *)(fde + 2);
- if (!read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType, 0, 0))
- return;
- ++n;
- }
-
- if (tableSize || !n)
- return;
-
- hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int)
- + 2 * n * sizeof(unsigned long);
- dprintk(2, "Binary lookup table size for %s: %lu bytes", table->name, hdrSize);
- header = alloc(hdrSize);
- if (!header)
- return;
- header->version = 1;
- header->eh_frame_ptr_enc = DW_EH_PE_abs|DW_EH_PE_native;
- header->fde_count_enc = DW_EH_PE_abs|DW_EH_PE_data4;
- header->table_enc = DW_EH_PE_abs|DW_EH_PE_native;
- put_unaligned((unsigned long)table->address, &header->eh_frame_ptr);
- BUILD_BUG_ON(offsetof(typeof(*header), fde_count)
- % __alignof(typeof(header->fde_count)));
- header->fde_count = n;
-
- BUILD_BUG_ON(offsetof(typeof(*header), table)
- % __alignof(typeof(*header->table)));
- for (fde = table->address, tableSize = table->size, n = 0;
- tableSize;
- tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) {
- const u32 *cie = fde + 1 - fde[1] / sizeof(*fde);
-
- if (!fde[1])
- continue; /* this is a CIE */
- ptr = (const u8 *)(fde + 2);
- header->table[n].start = read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- fde_pointer_type(cie), 0, 0);
- header->table[n].fde = (unsigned long)fde;
- ++n;
- }
- WARN_ON(n != header->fde_count);
-
- sort(header->table,
- n,
- sizeof(*header->table),
- cmp_eh_frame_hdr_table_entries,
- swap_eh_frame_hdr_table_entries);
-
- table->hdrsz = hdrSize;
- smp_wmb();
- table->header = (const void *)header;
-}
-
-static void *__init balloc(unsigned long sz)
-{
- return __alloc_bootmem_nopanic(sz,
- sizeof(unsigned int),
- __pa(MAX_DMA_ADDRESS));
-}
-
-void __init unwind_setup(void)
-{
- setup_unwind_table(&root_table, balloc);
-}
-
-#ifdef CONFIG_MODULES
-
-static struct unwind_table *last_table;
-
-/* Must be called with module_mutex held. */
-void *unwind_add_table(struct module *module,
- const void *table_start,
- unsigned long table_size)
-{
- struct unwind_table *table;
-
- if (table_size <= 0)
- return NULL;
-
- table = kmalloc(sizeof(*table), GFP_KERNEL);
- if (!table)
- return NULL;
-
- init_unwind_table(table, module->name,
- module->module_core, module->core_size,
- module->module_init, module->init_size,
- table_start, table_size,
- NULL, 0);
-
- if (last_table)
- last_table->link = table;
- else
- root_table.link = table;
- last_table = table;
-
- return table;
-}
-
-struct unlink_table_info
-{
- struct unwind_table *table;
- int init_only;
-};
-
-static int unlink_table(void *arg)
-{
- struct unlink_table_info *info = arg;
- struct unwind_table *table = info->table, *prev;
-
- for (prev = &root_table; prev->link && prev->link != table; prev = prev->link)
- ;
-
- if (prev->link) {
- if (info->init_only) {
- table->init.pc = 0;
- table->init.range = 0;
- info->table = NULL;
- } else {
- prev->link = table->link;
- if (!prev->link)
- last_table = prev;
- }
- } else
- info->table = NULL;
-
- return 0;
-}
-
-/* Must be called with module_mutex held. */
-void unwind_remove_table(void *handle, int init_only)
-{
- struct unwind_table *table = handle;
- struct unlink_table_info info;
-
- if (!table || table == &root_table)
- return;
-
- if (init_only && table == last_table) {
- table->init.pc = 0;
- table->init.range = 0;
- return;
- }
-
- info.table = table;
- info.init_only = init_only;
- stop_machine_run(unlink_table, &info, NR_CPUS);
-
- if (info.table)
- kfree(table);
-}
-
-#endif /* CONFIG_MODULES */
-
-static uleb128_t get_uleb128(const u8 **pcur, const u8 *end)
-{
- const u8 *cur = *pcur;
- uleb128_t value;
- unsigned shift;
-
- for (shift = 0, value = 0; cur < end; shift += 7) {
- if (shift + 7 > 8 * sizeof(value)
- && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
- cur = end + 1;
- break;
- }
- value |= (uleb128_t)(*cur & 0x7f) << shift;
- if (!(*cur++ & 0x80))
- break;
- }
- *pcur = cur;
-
- return value;
-}
-
-static sleb128_t get_sleb128(const u8 **pcur, const u8 *end)
-{
- const u8 *cur = *pcur;
- sleb128_t value;
- unsigned shift;
-
- for (shift = 0, value = 0; cur < end; shift += 7) {
- if (shift + 7 > 8 * sizeof(value)
- && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
- cur = end + 1;
- break;
- }
- value |= (sleb128_t)(*cur & 0x7f) << shift;
- if (!(*cur & 0x80)) {
- value |= -(*cur++ & 0x40) << shift;
- break;
- }
- }
- *pcur = cur;
-
- return value;
-}
-
-static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table)
-{
- const u32 *cie;
-
- if (!*fde || (*fde & (sizeof(*fde) - 1)))
- return &bad_cie;
- if (!fde[1])
- return &not_fde; /* this is a CIE */
- if ((fde[1] & (sizeof(*fde) - 1))
- || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address)
- return NULL; /* this is not a valid FDE */
- cie = fde + 1 - fde[1] / sizeof(*fde);
- if (*cie <= sizeof(*cie) + 4
- || *cie >= fde[1] - sizeof(*fde)
- || (*cie & (sizeof(*cie) - 1))
- || cie[1])
- return NULL; /* this is not a (valid) CIE */
- return cie;
-}
-
-static unsigned long read_pointer(const u8 **pLoc,
- const void *end,
- signed ptrType,
- unsigned long text_base,
- unsigned long data_base)
-{
- unsigned long value = 0;
- union {
- const u8 *p8;
- const u16 *p16u;
- const s16 *p16s;
- const u32 *p32u;
- const s32 *p32s;
- const unsigned long *pul;
- } ptr;
-
- if (ptrType < 0 || ptrType == DW_EH_PE_omit) {
- dprintk(1, "Invalid pointer encoding %02X (%p,%p).", ptrType, *pLoc, end);
- return 0;
- }
- ptr.p8 = *pLoc;
- switch(ptrType & DW_EH_PE_FORM) {
- case DW_EH_PE_data2:
- if (end < (const void *)(ptr.p16u + 1)) {
- dprintk(1, "Data16 overrun (%p,%p).", ptr.p8, end);
- return 0;
- }
- if(ptrType & DW_EH_PE_signed)
- value = get_unaligned(ptr.p16s++);
- else
- value = get_unaligned(ptr.p16u++);
- break;
- case DW_EH_PE_data4:
-#ifdef CONFIG_64BIT
- if (end < (const void *)(ptr.p32u + 1)) {
- dprintk(1, "Data32 overrun (%p,%p).", ptr.p8, end);
- return 0;
- }
- if(ptrType & DW_EH_PE_signed)
- value = get_unaligned(ptr.p32s++);
- else
- value = get_unaligned(ptr.p32u++);
- break;
- case DW_EH_PE_data8:
- BUILD_BUG_ON(sizeof(u64) != sizeof(value));
-#else
- BUILD_BUG_ON(sizeof(u32) != sizeof(value));
-#endif
- case DW_EH_PE_native:
- if (end < (const void *)(ptr.pul + 1)) {
- dprintk(1, "DataUL overrun (%p,%p).", ptr.p8, end);
- return 0;
- }
- value = get_unaligned(ptr.pul++);
- break;
- case DW_EH_PE_leb128:
- BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value));
- value = ptrType & DW_EH_PE_signed
- ? get_sleb128(&ptr.p8, end)
- : get_uleb128(&ptr.p8, end);
- if ((const void *)ptr.p8 > end) {
- dprintk(1, "DataLEB overrun (%p,%p).", ptr.p8, end);
- return 0;
- }
- break;
- default:
- dprintk(2, "Cannot decode pointer type %02X (%p,%p).",
- ptrType, ptr.p8, end);
- return 0;
- }
- switch(ptrType & DW_EH_PE_ADJUST) {
- case DW_EH_PE_abs:
- break;
- case DW_EH_PE_pcrel:
- value += (unsigned long)*pLoc;
- break;
- case DW_EH_PE_textrel:
- if (likely(text_base)) {
- value += text_base;
- break;
- }
- dprintk(2, "Text-relative encoding %02X (%p,%p), but zero text base.",
- ptrType, *pLoc, end);
- return 0;
- case DW_EH_PE_datarel:
- if (likely(data_base)) {
- value += data_base;
- break;
- }
- dprintk(2, "Data-relative encoding %02X (%p,%p), but zero data base.",
- ptrType, *pLoc, end);
- return 0;
- default:
- dprintk(2, "Cannot adjust pointer type %02X (%p,%p).",
- ptrType, *pLoc, end);
- return 0;
- }
- if ((ptrType & DW_EH_PE_indirect)
- && probe_kernel_address((unsigned long *)value, value)) {
- dprintk(1, "Cannot read indirect value %lx (%p,%p).",
- value, *pLoc, end);
- return 0;
- }
- *pLoc = ptr.p8;
-
- return value;
-}
-
-static signed fde_pointer_type(const u32 *cie)
-{
- const u8 *ptr = (const u8 *)(cie + 2);
- unsigned version = *ptr;
-
- if (version != 1)
- return -1; /* unsupported */
- if (*++ptr) {
- const char *aug;
- const u8 *end = (const u8 *)(cie + 1) + *cie;
- uleb128_t len;
-
- /* check if augmentation size is first (and thus present) */
- if (*ptr != 'z')
- return -1;
- /* check if augmentation string is nul-terminated */
- if ((ptr = memchr(aug = (const void *)ptr, 0, end - ptr)) == NULL)
- return -1;
- ++ptr; /* skip terminator */
- get_uleb128(&ptr, end); /* skip code alignment */
- get_sleb128(&ptr, end); /* skip data alignment */
- /* skip return address column */
- version <= 1 ? (void)++ptr : (void)get_uleb128(&ptr, end);
- len = get_uleb128(&ptr, end); /* augmentation length */
- if (ptr + len < ptr || ptr + len > end)
- return -1;
- end = ptr + len;
- while (*++aug) {
- if (ptr >= end)
- return -1;
- switch(*aug) {
- case 'L':
- ++ptr;
- break;
- case 'P': {
- signed ptrType = *ptr++;
-
- if (!read_pointer(&ptr, end, ptrType, 0, 0)
- || ptr > end)
- return -1;
- }
- break;
- case 'R':
- return *ptr;
- default:
- return -1;
- }
- }
- }
- return DW_EH_PE_native|DW_EH_PE_abs;
-}
-
-static int advance_loc(unsigned long delta, struct unwind_state *state)
-{
- state->loc += delta * state->codeAlign;
-
- return delta > 0;
-}
-
-static void set_rule(uleb128_t reg,
- enum item_location where,
- uleb128_t value,
- struct unwind_state *state)
-{
- if (reg < ARRAY_SIZE(state->regs)) {
- state->regs[reg].where = where;
- state->regs[reg].value = value;
- }
-}
-
-static int processCFI(const u8 *start,
- const u8 *end,
- unsigned long targetLoc,
- signed ptrType,
- struct unwind_state *state)
-{
- union {
- const u8 *p8;
- const u16 *p16;
- const u32 *p32;
- } ptr;
- int result = 1;
-
- if (start != state->cieStart) {
- state->loc = state->org;
- result = processCFI(state->cieStart, state->cieEnd, 0, ptrType, state);
- if (targetLoc == 0 && state->label == NULL)
- return result;
- }
- for (ptr.p8 = start; result && ptr.p8 < end; ) {
- switch(*ptr.p8 >> 6) {
- uleb128_t value;
-
- case 0:
- switch(*ptr.p8++) {
- case DW_CFA_nop:
- break;
- case DW_CFA_set_loc:
- state->loc = read_pointer(&ptr.p8, end, ptrType, 0, 0);
- if (state->loc == 0)
- result = 0;
- break;
- case DW_CFA_advance_loc1:
- result = ptr.p8 < end && advance_loc(*ptr.p8++, state);
- break;
- case DW_CFA_advance_loc2:
- result = ptr.p8 <= end + 2
- && advance_loc(*ptr.p16++, state);
- break;
- case DW_CFA_advance_loc4:
- result = ptr.p8 <= end + 4
- && advance_loc(*ptr.p32++, state);
- break;
- case DW_CFA_offset_extended:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value, Memory, get_uleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_val_offset:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value, Value, get_uleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_offset_extended_sf:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value, Memory, get_sleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_val_offset_sf:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value, Value, get_sleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_restore_extended:
- case DW_CFA_undefined:
- case DW_CFA_same_value:
- set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0, state);
- break;
- case DW_CFA_register:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value,
- Register,
- get_uleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_remember_state:
- if (ptr.p8 == state->label) {
- state->label = NULL;
- return 1;
- }
- if (state->stackDepth >= MAX_STACK_DEPTH) {
- dprintk(1, "State stack overflow (%p,%p).", ptr.p8, end);
- return 0;
- }
- state->stack[state->stackDepth++] = ptr.p8;
- break;
- case DW_CFA_restore_state:
- if (state->stackDepth) {
- const uleb128_t loc = state->loc;
- const u8 *label = state->label;
-
- state->label = state->stack[state->stackDepth - 1];
- memcpy(&state->cfa, &badCFA, sizeof(state->cfa));
- memset(state->regs, 0, sizeof(state->regs));
- state->stackDepth = 0;
- result = processCFI(start, end, 0, ptrType, state);
- state->loc = loc;
- state->label = label;
- } else {
- dprintk(1, "State stack underflow (%p,%p).", ptr.p8, end);
- return 0;
- }
- break;
- case DW_CFA_def_cfa:
- state->cfa.reg = get_uleb128(&ptr.p8, end);
- /*nobreak*/
- case DW_CFA_def_cfa_offset:
- state->cfa.offs = get_uleb128(&ptr.p8, end);
- break;
- case DW_CFA_def_cfa_sf:
- state->cfa.reg = get_uleb128(&ptr.p8, end);
- /*nobreak*/
- case DW_CFA_def_cfa_offset_sf:
- state->cfa.offs = get_sleb128(&ptr.p8, end)
- * state->dataAlign;
- break;
- case DW_CFA_def_cfa_register:
- state->cfa.reg = get_uleb128(&ptr.p8, end);
- break;
- /*todo case DW_CFA_def_cfa_expression: */
- /*todo case DW_CFA_expression: */
- /*todo case DW_CFA_val_expression: */
- case DW_CFA_GNU_args_size:
- get_uleb128(&ptr.p8, end);
- break;
- case DW_CFA_GNU_negative_offset_extended:
- value = get_uleb128(&ptr.p8, end);
- set_rule(value,
- Memory,
- (uleb128_t)0 - get_uleb128(&ptr.p8, end), state);
- break;
- case DW_CFA_GNU_window_save:
- default:
- dprintk(1, "Unrecognized CFI op %02X (%p,%p).", ptr.p8[-1], ptr.p8 - 1, end);
- result = 0;
- break;
- }
- break;
- case 1:
- result = advance_loc(*ptr.p8++ & 0x3f, state);
- break;
- case 2:
- value = *ptr.p8++ & 0x3f;
- set_rule(value, Memory, get_uleb128(&ptr.p8, end), state);
- break;
- case 3:
- set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state);
- break;
- }
- if (ptr.p8 > end) {
- dprintk(1, "Data overrun (%p,%p).", ptr.p8, end);
- result = 0;
- }
- if (result && targetLoc != 0 && targetLoc < state->loc)
- return 1;
- }
-
- if (result && ptr.p8 < end)
- dprintk(1, "Data underrun (%p,%p).", ptr.p8, end);
-
- return result
- && ptr.p8 == end
- && (targetLoc == 0
- || (/*todo While in theory this should apply, gcc in practice omits
- everything past the function prolog, and hence the location
- never reaches the end of the function.
- targetLoc < state->loc &&*/ state->label == NULL));
-}
-
-/* Unwind to previous to frame. Returns 0 if successful, negative
- * number in case of an error. */
-int unwind(struct unwind_frame_info *frame)
-{
-#define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs])
- const u32 *fde = NULL, *cie = NULL;
- const u8 *ptr = NULL, *end = NULL;
- unsigned long pc = UNW_PC(frame) - frame->call_frame, sp;
- unsigned long startLoc = 0, endLoc = 0, cfa;
- unsigned i;
- signed ptrType = -1;
- uleb128_t retAddrReg = 0;
- const struct unwind_table *table;
- struct unwind_state state;
-
- if (UNW_PC(frame) == 0)
- return -EINVAL;
- if ((table = find_table(pc)) != NULL
- && !(table->size & (sizeof(*fde) - 1))) {
- const u8 *hdr = table->header;
- unsigned long tableSize;
-
- smp_rmb();
- if (hdr && hdr[0] == 1) {
- switch(hdr[3] & DW_EH_PE_FORM) {
- case DW_EH_PE_native: tableSize = sizeof(unsigned long); break;
- case DW_EH_PE_data2: tableSize = 2; break;
- case DW_EH_PE_data4: tableSize = 4; break;
- case DW_EH_PE_data8: tableSize = 8; break;
- default: tableSize = 0; break;
- }
- ptr = hdr + 4;
- end = hdr + table->hdrsz;
- if (tableSize
- && read_pointer(&ptr, end, hdr[1], 0, 0)
- == (unsigned long)table->address
- && (i = read_pointer(&ptr, end, hdr[2], 0, 0)) > 0
- && i == (end - ptr) / (2 * tableSize)
- && !((end - ptr) % (2 * tableSize))) {
- do {
- const u8 *cur = ptr + (i / 2) * (2 * tableSize);
-
- startLoc = read_pointer(&cur,
- cur + tableSize,
- hdr[3], 0,
- (unsigned long)hdr);
- if (pc < startLoc)
- i /= 2;
- else {
- ptr = cur - tableSize;
- i = (i + 1) / 2;
- }
- } while (startLoc && i > 1);
- if (i == 1
- && (startLoc = read_pointer(&ptr,
- ptr + tableSize,
- hdr[3], 0,
- (unsigned long)hdr)) != 0
- && pc >= startLoc)
- fde = (void *)read_pointer(&ptr,
- ptr + tableSize,
- hdr[3], 0,
- (unsigned long)hdr);
- }
- }
- if(hdr && !fde)
- dprintk(3, "Binary lookup for %lx failed.", pc);
-
- if (fde != NULL) {
- cie = cie_for_fde(fde, table);
- ptr = (const u8 *)(fde + 2);
- if(cie != NULL
- && cie != &bad_cie
- && cie != &not_fde
- && (ptrType = fde_pointer_type(cie)) >= 0
- && read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType, 0, 0) == startLoc) {
- if (!(ptrType & DW_EH_PE_indirect))
- ptrType &= DW_EH_PE_FORM|DW_EH_PE_signed;
- endLoc = startLoc
- + read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType, 0, 0);
- if(pc >= endLoc)
- fde = NULL;
- } else
- fde = NULL;
- if(!fde)
- dprintk(1, "Binary lookup result for %lx discarded.", pc);
- }
- if (fde == NULL) {
- for (fde = table->address, tableSize = table->size;
- cie = NULL, tableSize > sizeof(*fde)
- && tableSize - sizeof(*fde) >= *fde;
- tableSize -= sizeof(*fde) + *fde,
- fde += 1 + *fde / sizeof(*fde)) {
- cie = cie_for_fde(fde, table);
- if (cie == &bad_cie) {
- cie = NULL;
- break;
- }
- if (cie == NULL
- || cie == &not_fde
- || (ptrType = fde_pointer_type(cie)) < 0)
- continue;
- ptr = (const u8 *)(fde + 2);
- startLoc = read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType, 0, 0);
- if (!startLoc)
- continue;
- if (!(ptrType & DW_EH_PE_indirect))
- ptrType &= DW_EH_PE_FORM|DW_EH_PE_signed;
- endLoc = startLoc
- + read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType, 0, 0);
- if (pc >= startLoc && pc < endLoc)
- break;
- }
- if(!fde)
- dprintk(3, "Linear lookup for %lx failed.", pc);
- }
- }
- if (cie != NULL) {
- memset(&state, 0, sizeof(state));
- state.cieEnd = ptr; /* keep here temporarily */
- ptr = (const u8 *)(cie + 2);
- end = (const u8 *)(cie + 1) + *cie;
- frame->call_frame = 1;
- if ((state.version = *ptr) != 1)
- cie = NULL; /* unsupported version */
- else if (*++ptr) {
- /* check if augmentation size is first (and thus present) */
- if (*ptr == 'z') {
- while (++ptr < end && *ptr) {
- switch(*ptr) {
- /* check for ignorable (or already handled)
- * nul-terminated augmentation string */
- case 'L':
- case 'P':
- case 'R':
- continue;
- case 'S':
- frame->call_frame = 0;
- continue;
- default:
- break;
- }
- break;
- }
- }
- if (ptr >= end || *ptr)
- cie = NULL;
- }
- if(!cie)
- dprintk(1, "CIE unusable (%p,%p).", ptr, end);
- ++ptr;
- }
- if (cie != NULL) {
- /* get code aligment factor */
- state.codeAlign = get_uleb128(&ptr, end);
- /* get data aligment factor */
- state.dataAlign = get_sleb128(&ptr, end);
- if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end)
- cie = NULL;
- else if (UNW_PC(frame) % state.codeAlign
- || UNW_SP(frame) % sleb128abs(state.dataAlign)) {
- dprintk(1, "Input pointer(s) misaligned (%lx,%lx).",
- UNW_PC(frame), UNW_SP(frame));
- return -EPERM;
- } else {
- retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
- /* skip augmentation */
- if (((const char *)(cie + 2))[1] == 'z') {
- uleb128_t augSize = get_uleb128(&ptr, end);
-
- ptr += augSize;
- }
- if (ptr > end
- || retAddrReg >= ARRAY_SIZE(reg_info)
- || REG_INVALID(retAddrReg)
- || reg_info[retAddrReg].width != sizeof(unsigned long))
- cie = NULL;
- }
- if(!cie)
- dprintk(1, "CIE validation failed (%p,%p).", ptr, end);
- }
- if (cie != NULL) {
- state.cieStart = ptr;
- ptr = state.cieEnd;
- state.cieEnd = end;
- end = (const u8 *)(fde + 1) + *fde;
- /* skip augmentation */
- if (((const char *)(cie + 2))[1] == 'z') {
- uleb128_t augSize = get_uleb128(&ptr, end);
-
- if ((ptr += augSize) > end)
- fde = NULL;
- }
- if(!fde)
- dprintk(1, "FDE validation failed (%p,%p).", ptr, end);
- }
- if (cie == NULL || fde == NULL) {
-#ifdef CONFIG_FRAME_POINTER
- unsigned long top, bottom;
-
- if ((UNW_SP(frame) | UNW_FP(frame)) % sizeof(unsigned long))
- return -EPERM;
- top = STACK_TOP(frame->task);
- bottom = STACK_BOTTOM(frame->task);
-# if FRAME_RETADDR_OFFSET < 0
- if (UNW_SP(frame) < top
- && UNW_FP(frame) <= UNW_SP(frame)
- && bottom < UNW_FP(frame)
-# else
- if (UNW_SP(frame) > top
- && UNW_FP(frame) >= UNW_SP(frame)
- && bottom > UNW_FP(frame)
-# endif
- && !((UNW_SP(frame) | UNW_FP(frame))
- & (sizeof(unsigned long) - 1))) {
- unsigned long link;
-
- if (!probe_kernel_address(
- (unsigned long *)(UNW_FP(frame)
- + FRAME_LINK_OFFSET),
- link)
-# if FRAME_RETADDR_OFFSET < 0
- && link > bottom && link < UNW_FP(frame)
-# else
- && link > UNW_FP(frame) && link < bottom
-# endif
- && !(link & (sizeof(link) - 1))
- && !probe_kernel_address(
- (unsigned long *)(UNW_FP(frame)
- + FRAME_RETADDR_OFFSET), UNW_PC(frame))) {
- UNW_SP(frame) = UNW_FP(frame) + FRAME_RETADDR_OFFSET
-# if FRAME_RETADDR_OFFSET < 0
- -
-# else
- +
-# endif
- sizeof(UNW_PC(frame));
- UNW_FP(frame) = link;
- return 0;
- }
- }
-#endif
- return -ENXIO;
- }
- state.org = startLoc;
- memcpy(&state.cfa, &badCFA, sizeof(state.cfa));
- /* process instructions */
- if (!processCFI(ptr, end, pc, ptrType, &state)
- || state.loc > endLoc
- || state.regs[retAddrReg].where == Nowhere
- || state.cfa.reg >= ARRAY_SIZE(reg_info)
- || reg_info[state.cfa.reg].width != sizeof(unsigned long)
- || FRAME_REG(state.cfa.reg, unsigned long) % sizeof(unsigned long)
- || state.cfa.offs % sizeof(unsigned long)) {
- dprintk(1, "Unusable unwind info (%p,%p).", ptr, end);
- return -EIO;
- }
- /* update frame */
-#ifndef CONFIG_AS_CFI_SIGNAL_FRAME
- if(frame->call_frame
- && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign))
- frame->call_frame = 0;
-#endif
- cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs;
- startLoc = min((unsigned long)UNW_SP(frame), cfa);
- endLoc = max((unsigned long)UNW_SP(frame), cfa);
- if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) {
- startLoc = min(STACK_LIMIT(cfa), cfa);
- endLoc = max(STACK_LIMIT(cfa), cfa);
- }
-#ifndef CONFIG_64BIT
-# define CASES CASE(8); CASE(16); CASE(32)
-#else
-# define CASES CASE(8); CASE(16); CASE(32); CASE(64)
-#endif
- pc = UNW_PC(frame);
- sp = UNW_SP(frame);
- for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
- if (REG_INVALID(i)) {
- if (state.regs[i].where == Nowhere)
- continue;
- dprintk(1, "Cannot restore register %u (%d).",
- i, state.regs[i].where);
- return -EIO;
- }
- switch(state.regs[i].where) {
- default:
- break;
- case Register:
- if (state.regs[i].value >= ARRAY_SIZE(reg_info)
- || REG_INVALID(state.regs[i].value)
- || reg_info[i].width > reg_info[state.regs[i].value].width) {
- dprintk(1, "Cannot restore register %u from register %lu.",
- i, state.regs[i].value);
- return -EIO;
- }
- switch(reg_info[state.regs[i].value].width) {
-#define CASE(n) \
- case sizeof(u##n): \
- state.regs[i].value = FRAME_REG(state.regs[i].value, \
- const u##n); \
- break
- CASES;
-#undef CASE
- default:
- dprintk(1, "Unsupported register size %u (%lu).",
- reg_info[state.regs[i].value].width,
- state.regs[i].value);
- return -EIO;
- }
- break;
- }
- }
- for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
- if (REG_INVALID(i))
- continue;
- switch(state.regs[i].where) {
- case Nowhere:
- if (reg_info[i].width != sizeof(UNW_SP(frame))
- || &FRAME_REG(i, __typeof__(UNW_SP(frame)))
- != &UNW_SP(frame))
- continue;
- UNW_SP(frame) = cfa;
- break;
- case Register:
- switch(reg_info[i].width) {
-#define CASE(n) case sizeof(u##n): \
- FRAME_REG(i, u##n) = state.regs[i].value; \
- break
- CASES;
-#undef CASE
- default:
- dprintk(1, "Unsupported register size %u (%u).",
- reg_info[i].width, i);
- return -EIO;
- }
- break;
- case Value:
- if (reg_info[i].width != sizeof(unsigned long)) {
- dprintk(1, "Unsupported value size %u (%u).",
- reg_info[i].width, i);
- return -EIO;
- }
- FRAME_REG(i, unsigned long) = cfa + state.regs[i].value
- * state.dataAlign;
- break;
- case Memory: {
- unsigned long addr = cfa + state.regs[i].value
- * state.dataAlign;
-
- if ((state.regs[i].value * state.dataAlign)
- % sizeof(unsigned long)
- || addr < startLoc
- || addr + sizeof(unsigned long) < addr
- || addr + sizeof(unsigned long) > endLoc) {
- dprintk(1, "Bad memory location %lx (%lx).",
- addr, state.regs[i].value);
- return -EIO;
- }
- switch(reg_info[i].width) {
-#define CASE(n) case sizeof(u##n): \
- probe_kernel_address((u##n *)addr, FRAME_REG(i, u##n)); \
- break
- CASES;
-#undef CASE
- default:
- dprintk(1, "Unsupported memory size %u (%u).",
- reg_info[i].width, i);
- return -EIO;
- }
- }
- break;
- }
- }
-
- if (UNW_PC(frame) % state.codeAlign
- || UNW_SP(frame) % sleb128abs(state.dataAlign)) {
- dprintk(1, "Output pointer(s) misaligned (%lx,%lx).",
- UNW_PC(frame), UNW_SP(frame));
- return -EIO;
- }
- if (pc == UNW_PC(frame) && sp == UNW_SP(frame)) {
- dprintk(1, "No progress (%lx,%lx).", pc, sp);
- return -EIO;
- }
-
- return 0;
-#undef CASES
-#undef FRAME_REG
-}
-EXPORT_SYMBOL(unwind);
-
-int unwind_init_frame_info(struct unwind_frame_info *info,
- struct task_struct *tsk,
- /*const*/ struct pt_regs *regs)
-{
- info->task = tsk;
- info->call_frame = 0;
- arch_unw_init_frame_info(info, regs);
-
- return 0;
-}
-EXPORT_SYMBOL(unwind_init_frame_info);
-
-/*
- * Prepare to unwind a blocked task.
- */
-int unwind_init_blocked(struct unwind_frame_info *info,
- struct task_struct *tsk)
-{
- info->task = tsk;
- info->call_frame = 0;
- arch_unw_init_blocked(info);
-
- return 0;
-}
-EXPORT_SYMBOL(unwind_init_blocked);
-
-/*
- * Prepare to unwind the currently running thread.
- */
-int unwind_init_running(struct unwind_frame_info *info,
- asmlinkage int (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg)
-{
- info->task = current;
- info->call_frame = 0;
-
- return arch_unwind_init_running(info, callback, arg);
-}
-EXPORT_SYMBOL(unwind_init_running);
-
-/*
- * Unwind until the return pointer is in user-land (or until an error
- * occurs). Returns 0 if successful, negative number in case of
- * error.
- */
-int unwind_to_user(struct unwind_frame_info *info)
-{
- while (!arch_unw_user_mode(info)) {
- int err = unwind(info);
-
- if (err < 0)
- return err;
- }
-
- return 0;
-}
-EXPORT_SYMBOL(unwind_to_user);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 818e4589f71..5c2681875b9 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -354,24 +354,6 @@ config FRAME_POINTER
some architectures or if you use external debuggers.
If you don't debug the kernel, you can say N.
-config UNWIND_INFO
- bool "Compile the kernel with frame unwind information"
- depends on !IA64 && !PARISC && !ARM
- depends on !MODULES || !(MIPS || PPC || SUPERH || V850)
- help
- If you say Y here the resulting kernel image will be slightly larger
- but not slower, and it will give very useful debugging information.
- If you don't debug the kernel, you can say N, but we may not be able
- to solve problems without frame unwind information or frame pointers.
-
-config STACK_UNWIND
- bool "Stack unwind support"
- depends on UNWIND_INFO
- depends on X86
- help
- This enables more precise stack traces, omitting all unrelated
- occurrences of pointers into kernel code from the dump.
-
config FORCED_INLINING
bool "Force gcc to inline functions marked 'inline'"
depends on DEBUG_KERNEL
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index d143c0faf24..b5a90fc056d 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -55,37 +55,7 @@ static bool fail_task(struct fault_attr *attr, struct task_struct *task)
#define MAX_STACK_TRACE_DEPTH 32
-#ifdef CONFIG_STACK_UNWIND
-
-static asmlinkage int fail_stacktrace_callback(struct unwind_frame_info *info,
- void *arg)
-{
- int depth;
- struct fault_attr *attr = arg;
- bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX);
-
- for (depth = 0; depth < attr->stacktrace_depth
- && unwind(info) == 0 && UNW_PC(info); depth++) {
- if (arch_unw_user_mode(info))
- break;
- if (attr->reject_start <= UNW_PC(info) &&
- UNW_PC(info) < attr->reject_end)
- return false;
- if (attr->require_start <= UNW_PC(info) &&
- UNW_PC(info) < attr->require_end)
- found = true;
- }
- return found;
-}
-
-static bool fail_stacktrace(struct fault_attr *attr)
-{
- struct unwind_frame_info info;
-
- return unwind_init_running(&info, fail_stacktrace_callback, attr);
-}
-
-#elif defined(CONFIG_STACKTRACE)
+#if defined(CONFIG_STACKTRACE)
static bool fail_stacktrace(struct fault_attr *attr)
{
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 14:35:02 +0000