diff options
| -rw-r--r-- | Makefile | 5 | ||||
| -rw-r--r-- | arch/i386/defconfig | 2 | ||||
| -rw-r--r-- | arch/i386/kernel/entry.S | 32 | ||||
| -rw-r--r-- | arch/i386/kernel/traps.c | 83 | ||||
| -rw-r--r-- | arch/x86_64/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86_64/defconfig | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/entry.S | 33 | ||||
| -rw-r--r-- | arch/x86_64/kernel/traps.c | 84 | ||||
| -rw-r--r-- | arch/x86_64/kernel/vmlinux.lds.S | 2 | ||||
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 22 | ||||
| -rw-r--r-- | include/asm-i386/unwind.h | 91 | ||||
| -rw-r--r-- | include/asm-x86_64/unwind.h | 96 | ||||
| -rw-r--r-- | include/linux/unwind.h | 63 | ||||
| -rw-r--r-- | kernel/Makefile | 1 | ||||
| -rw-r--r-- | kernel/unwind.c | 1305 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 18 | ||||
| -rw-r--r-- | lib/fault-inject.c | 32 |
17 files changed, 3 insertions, 1870 deletions
@@ -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)®s->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; - uns |