From: Don Zickus <dzickus@redhat.com>
Subject: [RHEL-5 PATCH 1/2] remove unwinder patches from x86/x86_64
Date: Tue, 2 Jan 2007 17:08:23 -0500
Bugzilla: 220238
Message-Id: <20070102220823.GL5381@redhat.com>
Changelog: x86: remove unwinder patches from x86/x86_64
bugzilla: 220238
The unwinder patches were dropped upstream, no need to support them in
RHEL-5 either.
I tested the changes by running them through the normal kernel level
testing, the rhts kexec/kdump testing, and some manual panicing. No ill
effects were noticed.
The config changes:
#Index: configs/config-generic
#===================================================================
#RCS file: /cvs/dist/rpms/kernel/RHEL-5/configs/config-generic,v
#retrieving revision 1.262
#diff -u -r1.262 config-generic
#--- configs/config-generic 15 Dec 2006 23:48:13 -0000 1.262
#+++ configs/config-generic 2 Jan 2007 22:02:36 -0000
#@@ -2841,9 +2841,6 @@
## END of ISA options.
-CONFIG_UNWIND_INFO=y
-CONFIG_STACK_UNWIND=y
-
# CONFIG_FORCED_INLINING is not set
CONFIG_MIGRATION=y
The upstream stream changed (modified for RHEL-5) and the xen part:
Index: latest/Makefile
===================================================================
--- latest.orig/Makefile
+++ latest/Makefile
@@ -487,10 +487,6 @@ else
CFLAGS += -fomit-frame-pointer
endif
-ifdef CONFIG_UNWIND_INFO
-CFLAGS += -fasynchronous-unwind-tables
-endif
-
ifdef CONFIG_DEBUG_INFO
CFLAGS += -g
endif
Index: latest/arch/i386/kernel/entry.S
===================================================================
--- latest.orig/arch/i386/kernel/entry.S
+++ latest/arch/i386/kernel/entry.S
@@ -927,37 +927,6 @@ 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, EBX(%edx)
- xorl %ebx, %ebx
- movl %ebx, ECX(%edx)
- movl %ebx, EDX(%edx)
- movl %esi, ESI(%edx)
- movl %edi, EDI(%edx)
- movl %ebp, EBP(%edx)
- movl %ebx, EAX(%edx)
- movl $__USER_DS, DS(%edx)
- movl $__USER_DS, ES(%edx)
- movl %ebx, ORIG_EAX(%edx)
- movl %ecx, EIP(%edx)
- movl 12(%esp), %ecx
- movl $__KERNEL_CS, CS(%edx)
- movl %ebx, EFLAGS(%edx)
- movl %eax, OLDESP(%edx)
- movl 8(%esp), %eax
- movl %ecx, 8(%esp)
- movl EBX(%edx), %ebx
- movl $__KERNEL_DS, 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
Index: latest/arch/i386/kernel/traps.c
===================================================================
--- latest.orig/arch/i386/kernel/traps.c
+++ latest/arch/i386/kernel/traps.c
@@ -94,11 +94,6 @@ asmlinkage void spurious_interrupt_bug(v
asmlinkage void machine_check(void);
static 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);
extern char last_sysfs_file[];
@@ -150,26 +145,6 @@ static inline unsigned long print_contex
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;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- }
- return n;
-}
-
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack,
struct stacktrace_ops *ops, void *data)
@@ -179,39 +154,6 @@ void dump_trace(struct task_struct *task
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) {
- ops->warning(data, "Leftover inexact backtrace:");
- stack = (void *)UNW_SP(&info);
- if (!stack)
- return;
- ebp = UNW_FP(&info);
- } else
- ops->warning(data, "Full inexact backtrace again:");
- } else if (call_trace >= 1)
- return;
- else
- ops->warning(data, "Full inexact backtrace again:");
- } else
- ops->warning(data, "Inexact backtrace:");
- }
if (!stack) {
unsigned long dummy;
stack = &dummy;
@@ -1392,18 +1334,3 @@ static int __init kstack_setup(char *s)
}
__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
Index: latest/arch/x86_64/Makefile
===================================================================
--- latest.orig/arch/x86_64/Makefile
+++ latest/arch/x86_64/Makefile
@@ -45,9 +45,7 @@ cflags-kernel-$(CONFIG_REORDER) += -ffun
# 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.
Index: latest/arch/x86_64/kernel/entry.S
===================================================================
--- latest.orig/arch/x86_64/kernel/entry.S
+++ latest/arch/x86_64/kernel/entry.S
@@ -1171,35 +1171,3 @@ ENTRY(call_softirq)
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
Index: latest/arch/x86_64/kernel/traps.c
===================================================================
--- latest.orig/arch/x86_64/kernel/traps.c
+++ latest/arch/x86_64/kernel/traps.c
@@ -110,11 +110,6 @@ static inline void preempt_conditional_c
}
static int kstack_depth_to_print = 12;
-#ifdef CONFIG_STACK_UNWIND
-static int call_trace = 1;
-#else
-#define call_trace (-1)
-#endif
#ifdef CONFIG_KALLSYMS
# include <linux/kallsyms.h>
@@ -237,25 +232,6 @@ static unsigned long *in_exception_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;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- }
- return n;
-}
-
/*
* x86-64 can have upto three kernel stacks:
* process stack
@@ -273,38 +249,6 @@ void dump_trace(struct task_struct *tsk,
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) {
- ops->warning(data, "Leftover inexact backtrace:");
- stack = (unsigned long *)UNW_SP(&info);
- if (!stack)
- return;
- } else
- ops->warning(data, "Full inexact backtrace again:");
- } else if (call_trace >= 1)
- return;
- else
- ops->warning(data, "Full inexact backtrace again:");
- } else
- ops->warning(data, "Inexact backtrace:");
- }
if (!stack) {
unsigned long dummy;
stack = &dummy;
@@ -1176,18 +1120,3 @@ static int __init kstack_setup(char *s)
}
__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") == 0)
- call_trace = 2;
- return 1;
-}
-__setup("call_trace=", call_trace_setup);
-#endif
Index: latest/arch/x86_64/kernel/vmlinux.lds.S
===================================================================
--- latest.orig/arch/x86_64/kernel/vmlinux.lds.S
+++ latest/arch/x86_64/kernel/vmlinux.lds.S
@@ -239,9 +239,7 @@ SECTIONS
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
-#ifndef CONFIG_UNWIND_INFO
*(.eh_frame)
-#endif
}
STABS_DEBUG
Index: latest/include/asm-i386/unwind.h
===================================================================
--- latest.orig/include/asm-i386/unwind.h
+++ latest/include/asm-i386/unwind.h
@@ -1,93 +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;
-};
-
-#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)
-
-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;
-}
-
-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)
-{
-#if 0 /* This can only work when selector register and EFLAGS saves/restores
- are properly annotated (and tracked in UNW_REGISTER_INFO). */
- return user_mode_vm(&info->regs);
-#else
- return 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;
-#endif
-}
-
-#else
-
#define UNW_PC(frame) ((void)(frame), 0)
#define UNW_SP(frame) ((void)(frame), 0)
#define UNW_FP(frame) ((void)(frame), 0)
@@ -97,6 +10,4 @@ static inline int arch_unw_user_mode(con
return 0;
}
-#endif
-
#endif /* _ASM_I386_UNWIND_H */
Index: latest/include/asm-x86_64/unwind.h
===================================================================
--- latest.orig/include/asm-x86_64/unwind.h
+++ latest/include/asm-x86_64/unwind.h
@@ -1,99 +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;
-};
-
-#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)
-
-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)
-{
-#if 0 /* This can only work when selector register saves/restores
- are properly annotated (and tracked in UNW_REGISTER_INFO). */
- return user_mode(&info->regs);
-#else
- return (long)info->regs.rip >= 0
- || (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
- || (long)info->regs.rsp >= 0;
-#endif
-}
-
-#else
-
#define UNW_PC(frame) ((void)(frame), 0UL)
#define UNW_SP(frame) ((void)(frame), 0UL)
@@ -102,6 +9,4 @@ static inline int arch_unw_user_mode(con
return 0;
}
-#endif
-
#endif /* _ASM_X86_64_UNWIND_H */
Index: latest/include/linux/unwind.h
===================================================================
--- latest.orig/include/linux/unwind.h
+++ latest/include/linux/unwind.h
@@ -14,62 +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);
-
-#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) {}
@@ -83,12 +27,12 @@ static inline void *unwind_add_table(str
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)
@@ -120,6 +64,4 @@ static inline int unwind_to_user(struct
return -ENOSYS;
}
-#endif
-
#endif /* _LINUX_UNWIND_H */
Index: latest/kernel/Makefile
===================================================================
--- latest.orig/kernel/Makefile
+++ latest/kernel/Makefile
@@ -32,7 +32,6 @@ obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o module-verify.o
obj-$(CONFIG_MODULE_SIG) += module-verify-sig.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
Index: latest/kernel/unwind.c
===================================================================
--- latest.orig/kernel/unwind.c
+++ /dev/null
@@ -1,920 +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/delay.h>
-#include <linux/stop_machine.h>
-#include <asm/sections.h>
-#include <asm/uaccess.h>
-#include <asm/unaligned.h>
-
-extern char __start_unwind[], __end_unwind[];
-
-#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;
-
-static struct unwind_table {
- struct {
- unsigned long pc;
- unsigned long range;
- } core, init;
- const void *address;
- unsigned long size;
- 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 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 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)
-{
- 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;
- 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);
-}
-
-#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);
-
- 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 unsigned long read_pointer(const u8 **pLoc,
- const void *end,
- signed ptrType)
-{
- 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)
- return 0;
- ptr.p8 = *pLoc;
- switch(ptrType & DW_EH_PE_FORM) {
- case DW_EH_PE_data2:
- if (end < (const void *)(ptr.p16u + 1))
- 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))
- 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))
- 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)
- return 0;
- break;
- default:
- return 0;
- }
- switch(ptrType & DW_EH_PE_ADJUST) {
- case DW_EH_PE_abs:
- break;
- case DW_EH_PE_pcrel:
- value += (unsigned long)*pLoc;
- break;
- default:
- return 0;
- }
- if ((ptrType & DW_EH_PE_indirect)
- && __get_user(value, (unsigned long *)value))
- 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) || 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:
- if ((state->loc = read_pointer(&ptr.p8, end, ptrType)) == 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)
- 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
- 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:
- 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)
- result = 0;
- if (result && targetLoc != 0 && targetLoc < state->loc)
- return 1;
- }
-
- 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 startLoc = 0, endLoc = 0, cfa;
- unsigned i;
- signed ptrType = -1;
- uleb128_t retAddrReg = 0;
- struct unwind_table *table;
- struct unwind_state state;
-
- if (UNW_PC(frame) == 0)
- return -EINVAL;
- if ((table = find_table(UNW_PC(frame))) != NULL
- && !(table->size & (sizeof(*fde) - 1))) {
- unsigned long tableSize = table->size;
-
- for (fde = table->address;
- tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde;
- tableSize -= sizeof(*fde) + *fde,
- fde += 1 + *fde / sizeof(*fde)) {
- if (!*fde || (*fde & (sizeof(*fde) - 1)))
- break;
- if (!fde[1])
- continue; /* this is a CIE */
- if ((fde[1] & (sizeof(*fde) - 1))
- || fde[1] > (unsigned long)(fde + 1)
- - (unsigned long)table->address)
- continue; /* 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]
- || (ptrType = fde_pointer_type(cie)) < 0) {
- cie = NULL; /* this is not a (valid) CIE */
- continue;
- }
- ptr = (const u8 *)(fde + 2);
- startLoc = read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType);
- endLoc = startLoc
- + read_pointer(&ptr,
- (const u8 *)(fde + 1) + *fde,
- ptrType & DW_EH_PE_indirect
- ? ptrType
- : ptrType & (DW_EH_PE_FORM|DW_EH_PE_signed));
- if (UNW_PC(frame) >= startLoc && UNW_PC(frame) < endLoc)
- break;
- cie = NULL;
- }
- }
- 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;
- if ((state.version = *ptr) != 1)
- cie = NULL; /* unsupported version */
- else if (*++ptr) {
- /* check if augmentation size is first (and thus present) */
- if (*ptr == 'z') {
- /* check for ignorable (or already handled)
- * nul-terminated augmentation string */
- while (++ptr < end && *ptr)
- if (strchr("LPR", *ptr) == NULL)
- break;
- }
- if (ptr >= end || *ptr)
- cie = NULL;
- }
- ++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 {
- retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
- /* skip augmentation */
- if (((const char *)(cie + 2))[1] == 'z')
- ptr += get_uleb128(&ptr, end);
- if (ptr > end
- || retAddrReg >= ARRAY_SIZE(reg_info)
- || REG_INVALID(retAddrReg)
- || reg_info[retAddrReg].width != sizeof(unsigned long))
- cie = NULL;
- }
- }
- 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 (cie == NULL || fde == NULL) {
-#ifdef CONFIG_FRAME_POINTER
- unsigned long top, bottom;
-#endif
-
-#ifdef CONFIG_FRAME_POINTER
- 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 (!__get_user(link,
- (unsigned long *)(UNW_FP(frame)
- + FRAME_LINK_OFFSET))
-# if FRAME_RETADDR_OFFSET < 0
- && link > bottom && link < UNW_FP(frame)
-# else
- && link > UNW_FP(frame) && link < bottom
-# endif
- && !(link & (sizeof(link) - 1))
- && !__get_user(UNW_PC(frame),
- (unsigned long *)(UNW_FP(frame)
- + FRAME_RETADDR_OFFSET))) {
- 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, UNW_PC(frame), 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)
- || state.cfa.offs % sizeof(unsigned long))
- return -EIO;
- /* update frame */
- 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
- for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
- if (REG_INVALID(i)) {
- if (state.regs[i].where == Nowhere)
- continue;
- 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)
- 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:
- 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:
- return -EIO;
- }
- break;
- case Value:
- if (reg_info[i].width != sizeof(unsigned long))
- 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)
- return -EIO;
- switch(reg_info[i].width) {
-#define CASE(n) case sizeof(u##n): \
- __get_user(FRAME_REG(i, u##n), (u##n *)addr); \
- break
- CASES;
-#undef CASE
- default:
- return -EIO;
- }
- }
- break;
- }
- }
-
- 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;
- 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;
- 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;
-
- 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);
Index: latest/lib/Kconfig.debug
===================================================================
--- latest.orig/lib/Kconfig.debug
+++ latest/lib/Kconfig.debug
@@ -332,24 +332,6 @@ 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 && !X86_64_XEN
- 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
From: Don Zickus <dzickus@redhat.com>
Subject: [RHEL-5 PATCH 2/2] remove unwinder patches from x86/x86_64
Date: Tue, 2 Jan 2007 17:09:47 -0500
Bugzilla: NONE
Message-Id: <20070102220947.GM5381@redhat.com>
The xen part of the stack unwinder removal.
Index: latest/arch/i386/kernel/entry-xen.S
===================================================================
--- latest.orig/arch/i386/kernel/entry-xen.S
+++ latest/arch/i386/kernel/entry-xen.S
@@ -1173,37 +1173,6 @@ ENTRY(fixup_4gb_segment)
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, EBX(%edx)
- xorl %ebx, %ebx
- movl %ebx, ECX(%edx)
- movl %ebx, EDX(%edx)
- movl %esi, ESI(%edx)
- movl %edi, EDI(%edx)
- movl %ebp, EBP(%edx)
- movl %ebx, EAX(%edx)
- movl $__USER_DS, DS(%edx)
- movl $__USER_DS, ES(%edx)
- movl %ebx, ORIG_EAX(%edx)
- movl %ecx, EIP(%edx)
- movl 12(%esp), %ecx
- movl $__KERNEL_CS, CS(%edx)
- movl %ebx, EFLAGS(%edx)
- movl %eax, OLDESP(%edx)
- movl 8(%esp), %eax
- movl %ecx, 8(%esp)
- movl EBX(%edx), %ebx
- movl $__KERNEL_DS, OLDSS(%edx)
- jmpl *%eax
- CFI_ENDPROC
-ENDPROC(arch_unwind_init_running)
-#endif
-
.section .rodata,"a"
#include "syscall_table.S"
Index: latest/arch/i386/kernel/traps-xen.c
===================================================================
--- latest.orig/arch/i386/kernel/traps-xen.c
+++ latest/arch/i386/kernel/traps-xen.c
@@ -100,11 +100,6 @@ asmlinkage void fixup_4gb_segment(void);
asmlinkage void machine_check(void);
static 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);
extern char last_sysfs_file[];
@@ -156,26 +151,6 @@ static inline unsigned long print_contex
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;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- }
- return n;
-}
-
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack,
struct stacktrace_ops *ops, void *data)
@@ -185,37 +160,7 @@ void dump_trace(struct task_struct *task
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\n",
- UNW_PC(&info));
- if (UNW_SP(&info) >= PAGE_OFFSET) {
- ops->warning(data, "Leftover inexact backtrace:\n");
- stack = (void *)UNW_SP(&info);
- } else
- ops->warning(data, "Full inexact backtrace again:\n");
- } else if (call_trace >= 1)
- return;
- else
- ops->warning(data, "Full inexact backtrace again:\n");
- } else
- ops->warning(data, "Inexact backtrace:\n");
-
- } else if (!stack) {
+ if (!stack) {
unsigned long dummy;
stack = &dummy;
if (task && task != current)
@@ -1321,18 +1266,3 @@ static int __init kstack_setup(char *s)
}
__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
Index: latest/arch/x86_64/kernel/entry-xen.S
===================================================================
--- latest.orig/arch/x86_64/kernel/entry-xen.S
+++ latest/arch/x86_64/kernel/entry-xen.S
@@ -1179,35 +1179,3 @@ ENTRY(call_softirq)
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
Index: latest/arch/x86_64/kernel/traps-xen.c
===================================================================
--- latest.orig/arch/x86_64/kernel/traps-xen.c
+++ latest/arch/x86_64/kernel/traps-xen.c
@@ -109,12 +109,6 @@ static inline void preempt_conditional_c
}
static int kstack_depth_to_print = 10;
-#ifdef CONFIG_STACK_UNWIND
-static int call_trace = 1;
-#else
-#define call_trace (-1)
-#endif
-
#ifdef CONFIG_KALLSYMS
# include <linux/kallsyms.h>
@@ -239,25 +233,6 @@ static unsigned long *in_exception_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;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- if (arch_unw_user_mode(info))
- break;
- n++;
- oad->ops->address(oad->data, UNW_PC(info));
- }
- return n;
-}
-
/*
* x86-64 can have upto three kernel stacks:
* process stack
@@ -275,36 +250,6 @@ void dump_trace(struct task_struct *tsk,
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\n",
- UNW_PC(&info));
- if ((long)UNW_SP(&info) < 0) {
- ops->warning(data, "Leftover inexact backtrace:\n");
- stack = (unsigned long *)UNW_SP(&info);
- } else
- ops->warning(data, "Full inexact backtrace again:\n");
- } else if (call_trace >= 1)
- return;
- else
- ops->warning(data, "Full inexact backtrace again:\n");
- } else
- ops->warning(data, "Inexact backtrace:\n");
- }
if (!stack) {
unsigned long dummy;
stack = &dummy;
@@ -1207,18 +1152,3 @@ static int __init kstack_setup(char *s)
}
__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") == 0)
- call_trace = 2;
- return 1;
-}
-__setup("call_trace=", call_trace_setup);
-#endif
distrib
>
Scientific%20Linux
>
5x
>
x86_64
>
by-pkgid
>
89877e42827f16fa5f86b1df0c2860b1
>
files
>
2496
